Fix theming bug (#722)

- Adds full interaction with Hardcover lists, including adding and
removing from lists + want to read status
- List selection exposed in search results, details modal and release
modal
- Added automatic list dropdown when selecting "list" search
- Added auto-removal of books from a list when downloading from that
specific list page
- Changed search selector to hover-activated

.gitignore

@@ -232,3 +232,5 @@ pyrightconfig.json
 AGENTS.md
 .claude/
 .playwright-mcp/
+frontend-dist/
+node_modules/

Dockerfile

@@ -68,7 +68,7 @@ RUN apt-get update && \
     # For debug
     zip iputils-ping \
     # For user switching
-    sudo \
+    gosu \
     # --- Tor support (activated via USING_TOR=true) ---
     tor \
     supervisor \
@@ -130,11 +130,11 @@ RUN apt-get update && \
     xvfb \
     # For screen recording
     ffmpeg \
-    # --- Chromium ---
-    chromium=143.0.7499.169-1~deb13u1 \
-    chromium-common=143.0.7499.169-1~deb13u1 \
-    # --- ChromeDriver ---
-    chromium-driver=143.0.7499.169-1~deb13u1 \
+    # --- Chromium (unpinned - uses latest from Debian repos) ---
+    # Chrome 144+ requires --enable-unsafe-swiftshader for WebGL in Docker.
+    # This flag is set in internal_bypasser.py _get_browser_args()
+    chromium \
+    chromium-common \
     # For tkinter (pyautogui)
     python3-tk \
     # For RAR extraction
@@ -151,9 +151,7 @@ RUN --mount=type=cache,target=/root/.cache/pip \
     pip install -r requirements-shelfmark.txt
 
 # Grant read/execute permissions to others
-RUN chmod -R o+rx /usr/bin/chromium && \
-    chmod -R o+rx /usr/bin/chromedriver && \
-    chmod -R o+rwx /usr/local/lib/python3.10/site-packages/seleniumbase/drivers/
+RUN chmod -R o+rx /usr/bin/chromium
 
 # Default command to run the application entrypoint script
 CMD ["/app/entrypoint.sh"]

Makefile

@@ -1,4 +1,4 @@
-.PHONY: help install dev build preview typecheck clean up down docker-build refresh restart
+.PHONY: help install dev build preview typecheck frontend-test clean up down docker-build refresh restart
 
 # Frontend directory
 FRONTEND_DIR := src/frontend
@@ -16,6 +16,7 @@ help:
 	@echo "  build      - Build frontend for production"
 	@echo "  preview    - Preview production build"
 	@echo "  typecheck  - Run TypeScript type checking"
+	@echo "  frontend-test - Run frontend unit tests"
 	@echo "  clean      - Remove node_modules and build artifacts"
 	@echo ""
 	@echo "Backend (Docker):"
@@ -50,6 +51,11 @@ typecheck:
 	@echo "Running TypeScript type checking..."
 	cd $(FRONTEND_DIR) && npm run typecheck
 
+# Run frontend unit tests
+frontend-test:
+	@echo "Running frontend unit tests..."
+	cd $(FRONTEND_DIR) && npm run test:unit
+
 # Clean build artifacts and dependencies
 clean:
 	@echo "Cleaning build artifacts and dependencies..."

compose/docker-compose.lite.yml

@@ -1,6 +1,7 @@
 services:
   shelfmark-lite:
     image: ghcr.io/calibrain/shelfmark-lite:latest
+    container_name: shelfmark-lite
     environment:
       # EXT_BYPASSER_URL: http://flaresolverr:8191 #If using Flaresolverr
       PUID: 1000
@@ -12,4 +13,4 @@ services:
       - /path/to/books:/books # Default destination for book downloads
       - /path/to/config:/config # App configuration
       # Required for torrent / usenet - path must match your download client's volume exactly
-      # - /path/to/downloads:/path/to/downloads
+      # - /path/to/downloads:/path/to/downloads

docker-compose.bypass-test.yml

@@ -0,0 +1,39 @@
+# Bypass testing - switch between dev build and v1.0.1
+# Usage:
+#   Test dev build:  docker compose -f docker-compose.bypass-test.yml up shelfmark-dev
+#   Test v1.0.1:     docker compose -f docker-compose.bypass-test.yml up shelfmark-stable
+#   Pull latest dev: docker compose -f docker-compose.bypass-test.yml build shelfmark-dev
+#   Pull v1.0.1:     docker compose -f docker-compose.bypass-test.yml pull shelfmark-stable
+
+services:
+  # Dev image from registry
+  shelfmark-dev:
+    image: ghcr.io/calibrain/shelfmark:dev
+    container_name: shelfmark-bypass-dev
+    environment:
+      PUID: 1000
+      PGID: 1000
+      DEBUG: true
+    ports:
+      - 8084:8084
+    volumes:
+      - ./.local/bypass-test/config-dev:/config
+      - ./.local/bypass-test/books:/books
+      - ./.local/bypass-test/log-dev:/var/log/shelfmark
+      - ./.local/bypass-test/tmp:/tmp/shelfmark
+
+  # Stable v1.0.1 for comparison
+  shelfmark-stable:
+    image: ghcr.io/calibrain/shelfmark:1.0.1
+    container_name: shelfmark-bypass-stable
+    environment:
+      PUID: 1000
+      PGID: 1000
+      DEBUG: true
+    ports:
+      - 8085:8084
+    volumes:
+      - ./.local/bypass-test/config-stable:/config
+      - ./.local/bypass-test/books:/books
+      - ./.local/bypass-test/log-stable:/var/log/shelfmark
+      - ./.local/bypass-test/tmp:/tmp/shelfmark

docker-compose.dev.yml

@@ -12,6 +12,8 @@ services:
       - SYS_PTRACE
     environment:
       DEBUG: true
+      # HIDE_LOCAL_AUTH: true
+      OIDC_AUTO_REDIRECT: true
     volumes:
       - ./.local/config:/config
       - ./.local/books:/books

docs/configuration.md

@@ -1,3 +1,125 @@
-# Configuration
+# Directory and Volume Setup
 
-TODO
+This guide explains how to configure directories and Docker volumes for Shelfmark. It focuses on the difference between the destination folder and your download client paths, and how to make those paths line up inside containers.
+
+## Conceptual Overview
+
+```
+DIRECT DOWNLOADS
+
+Shelfmark downloads directly -> destination
+
+TORRENT / USENET
+
+Prowlarr -> Download client saves to <client path>
+         -> Shelfmark reads from <client path>
+         -> Shelfmark processes to destination
+```
+
+Key point: For torrent and usenet downloads, Shelfmark must see the same file path that your download client reports. The container path must match in both containers.
+
+## Direct Download Setup
+
+Direct downloads do not use an external download client. A simple two-folder setup is enough.
+
+Required volumes:
+
+| Container path | Purpose | Notes |
+| --- | --- | --- |
+| `/config` | Settings, database, cover cache | Configurable via `CONFIG_DIR` |
+| `/books` | Destination folder for completed files | Configurable via `INGEST_DIR` and Settings -> Downloads -> Destination |
+
+Example `docker-compose`:
+
+```yaml
+services:
+  shelfmark:
+    image: ghcr.io/calibrain/shelfmark:latest
+    volumes:
+      - /path/to/config:/config
+      - /path/to/books:/books
+```
+
+Notes:
+- Point `/books` to your library ingest folder (Calibre-Web, Booklore, Audiobookshelf, etc) for automatic import.
+- If you set Books Output Mode to Booklore (API), books are uploaded via API instead of written to `/books`. Audiobooks still use a destination folder.
+- Ensure `PUID`/`PGID` (or legacy `UID`/`GID`) match the owner of the host directories to avoid permission errors.
+
+## Torrent / Usenet Setup
+
+For torrents and usenet, your download client reports a path (for example `/data/torrents/books/MyBook.epub`). Shelfmark must be able to read that exact path inside its own container.
+
+Required volumes:
+
+| Container path | Purpose | Notes |
+| --- | --- | --- |
+| `/config` | Settings, database, cover cache | Configurable via `CONFIG_DIR` |
+| `/books` | Destination folder for processed files | Configurable via `INGEST_DIR` |
+| `<client path>` | Download client path | Must match the download client container path exactly |
+
+Side-by-side example with qBittorrent:
+
+```yaml
+services:
+  shelfmark:
+    volumes:
+      - /path/to/config:/config
+      - /path/to/books:/books
+      - /path/to/downloads:/data/torrents  # Must match client
+
+  qbittorrent:
+    volumes:
+      - /path/to/downloads:/data/torrents  # Same container path
+```
+
+Host paths can be anything. The container path (for example `/data/torrents`) must be identical in both containers.
+
+### Remote Path Mappings
+
+If paths cannot match (different machines or a fixed setup), use Remote Path Mappings.
+
+Where to configure:
+- Settings -> Advanced -> Remote Path Mappings
+
+Example:
+- Client reports `/data/torrents/books/...`
+- Shelfmark can see the same files at `/downloads/books/...`
+- Add a mapping from Remote Path `/data/torrents` to Local Path `/downloads`
+
+## File Processing Options
+
+### Transfer Method (Torrent / Usenet Only)
+
+Available methods:
+- Copy (default). Works everywhere.
+- Hardlink. Preserves seeding without duplicating files.
+
+Hardlink requirements and behavior:
+- Source and destination must be on the same filesystem.
+- If hardlinking is enabled but not possible, Shelfmark falls back to copying.
+- Archive extraction is disabled while hardlinking is enabled.
+- Do not use hardlinking if your destination is a library ingest folder.
+
+### File Organization
+
+Shelfmark supports three organization modes for the destination:
+- None. Keep original filenames from the source.
+- Rename Only. Rename files using a template.
+- Rename and Organize. Create folders and rename using templates. Do not use with ingest folders.
+
+Configure templates in Settings -> Downloads. Template syntax details are documented separately.
+
+## Common Mistakes
+
+- "Download failed - file not found": Path mismatch between Shelfmark and the download client. Ensure container paths match or use Remote Path Mappings.
+- "Permission denied": `PUID`/`PGID` do not match the host directories. Ensure Shelfmark can read the client path and write to the destination.
+- "Hardlinks not working" or "Files being copied instead": Source and destination are on different filesystems. Move the destination or accept copy fallback.
+- "Downloads work but library does not see them": Destination does not point to the library ingest folder. Check Settings -> Downloads -> Destination.
+- CIFS/SMB shares: Use the `nobrl` mount option to avoid database lock errors. Example: `//server/share /mnt/share cifs nobrl,... 0 0`
+
+## Related Documentation
+
+- Environment Variables Reference: `docs/environment-variables.md`
+- Custom Scripts: `docs/custom-scripts.md`
+- Installation: `docs/installation.md`
+- Troubleshooting: `docs/troubleshooting.md`

docs/custom-scripts.md

@@ -0,0 +1,184 @@
+# Custom Scripts
+
+Shelfmark can run an executable you provide after a download task completes successfully. The script runs after the selected output has finished (for example: transfer to the folder destination, or upload to Booklore).
+
+
+## Quick Start (Recommended)
+
+1. Put your script on the machine that runs Shelfmark.
+1. Make it executable.
+1. Set it in Shelfmark (Settings -> Advanced -> Custom Script Path).
+
+Example:
+
+```bash
+chmod +x /path/to/your/scripts/post_process.sh
+```
+
+### Docker Users
+
+If you run Shelfmark in Docker, the script must exist inside the container. The easiest way is to mount a folder of scripts, then point Shelfmark at the container path in the UI.
+
+```yaml
+services:
+  shelfmark:
+    image: ghcr.io/calibrain/shelfmark:latest
+    volumes:
+      - /path/to/your/scripts:/scripts:ro
+```
+
+Then set:
+
+- Settings -> Advanced -> Custom Script Path: `/scripts/post_process.sh`
+
+<details>
+<summary>Docker Compose: Configure Via Environment Variables (Optional)</summary>
+
+```yaml
+services:
+  shelfmark:
+    environment:
+      - CUSTOM_SCRIPT=/scripts/post_process.sh
+      - CUSTOM_SCRIPT_PATH_MODE=absolute
+      - CUSTOM_SCRIPT_JSON_PAYLOAD=true
+```
+
+</details>
+
+## Script Behaviour
+
+When enabled, Shelfmark runs your script once per successful task:
+
+```bash
+<custom_script_path> "<target_path>"
+```
+
+- `$1` is always set to the target path.
+- If **Custom Script JSON Payload** is enabled, Shelfmark writes a JSON document to stdin (UTF-8).
+- If JSON payload is disabled, stdin is empty (EOF).
+- Timeout: 300 seconds (5 minutes)
+- Exit code: `0` = success; anything else = the task is marked as **Error**
+- Concurrency: downloads can run in parallel, so your script may be invoked concurrently for different tasks.
+- Runtime: the script runs inside the Shelfmark container (if you use Docker) under the same user as Shelfmark.
+
+## The Target Path (`$1`)
+
+Shelfmark chooses a "best single path" for the task:
+
+- If the output produced exactly one local file: that file path.
+- If the output produced multiple local files: a directory path (the common parent directory of those files).
+
+What the target path refers to depends on the output mode:
+
+- Folder output (`output.mode=folder`, `phase=post_transfer`): the final imported file or folder inside your destination.
+- Booklore output (`output.mode=booklore`, `phase=post_upload`): the local file or folder that was uploaded (the destination is remote).
+
+By default, `$1` is an absolute path inside the Shelfmark container (or on your host, if you are not using Docker).
+
+## JSON Payload (stdin)
+
+Configure in: Settings -> Advanced -> Custom Script JSON Payload
+
+When enabled, Shelfmark sends a versioned JSON payload to your script via stdin (and still passes `$1`). This is the recommended way to write robust scripts, especially for multi-file imports (audiobooks) and output-specific context (like Booklore).
+
+- The JSON payload always includes absolute paths in `paths.*`, even if you set Custom Script Path Mode to `relative` for `$1`.
+- `output.mode` tells you which output ran.
+- `output.details` is output-specific. For Booklore output, `output.details.booklore` includes connection details such as `base_url`, `library_id`, and `path_id`.
+- `phase` indicates when the script is running. Current values: `post_transfer` (folder output), `post_upload` (Booklore output).
+- `transfer` is only included for outputs that do a local transfer (for example the folder output).
+
+If JSON payload is disabled, stdin is empty (EOF). Don't `cat` stdin unless you've enabled the payload.
+
+Example payload shape:
+
+```json
+{
+  "version": 1,
+  "phase": "post_transfer",
+  "task": {
+    "task_id": "abc123",
+    "source": "direct",
+    "title": "Foundation",
+    "author": "Isaac Asimov"
+  },
+  "output": {
+    "mode": "folder",
+    "organization_mode": "organize"
+  },
+  "paths": {
+    "destination": "/data/library/books",
+    "target": "/data/library/books/Isaac Asimov/Foundation/Foundation.epub",
+    "final_paths": [
+      "/data/library/books/Isaac Asimov/Foundation/Foundation.epub"
+    ]
+  },
+  "transfer": {
+    "op_counts": {"copy": 1, "move": 0, "hardlink": 0},
+    "use_hardlink": false,
+    "is_torrent": false,
+    "preserve_source": false
+  }
+}
+```
+
+Example (bash + jq) (JSON payload must be enabled):
+
+```bash
+payload="$(cat)"
+mode="$(echo "$payload" | jq -r '.output.mode')"
+title="$(echo "$payload" | jq -r '.task.title')"
+final_paths="$(echo "$payload" | jq -r '.paths.final_paths[]')"
+echo "mode=$mode title=$title" >&2
+echo "$final_paths" >&2
+```
+
+Example (Python) (works whether JSON payload is enabled or not):
+
+```python
+#!/usr/bin/env python3
+import json
+import sys
+
+target = sys.argv[1]
+raw = sys.stdin.read()
+payload = json.loads(raw) if raw.strip() else None
+
+print(f"target={target}", file=sys.stderr)
+if payload:
+    print(f"mode={payload['output']['mode']} phase={payload['phase']}", file=sys.stderr)
+```
+
+<details>
+<summary>Advanced Options</summary>
+
+### Absolute vs Relative Target Paths
+
+Configure in: Settings -> Advanced -> Custom Script Path Mode
+
+This setting controls what gets passed as `$1`:
+
+- `absolute` (default): pass an absolute path.
+- `relative`: pass a path relative to the output's "destination root", and run the script with `$PWD` set to that root.
+
+For folder output, the destination root is your configured destination folder. For Booklore output, it's the local upload folder.
+
+Example (folder destination is `/data/library/books`, and the imported file ended up in `Isaac Asimov/Foundation/Foundation.epub`):
+
+```bash
+# Absolute mode:
+$PWD is unchanged
+$1 = /data/library/books/Isaac Asimov/Foundation/Foundation.epub
+
+# Relative mode:
+$PWD = /data/library/books
+$1 = Isaac Asimov/Foundation/Foundation.epub
+```
+
+Note: if the target is the destination folder itself, `relative` mode may pass `.`.
+
+</details>
+
+## Notes And Caveats
+
+- **Hardlinks and torrents:** if you use hardlinking to keep seeding, avoid scripts that modify file contents, since hardlinked files share data with the seeding copy.
+- **Booklore output mode:** scripts run after upload. `$1` will point at the local uploaded file (or staging folder).

docs/dev/plugin-settings.md

@@ -190,6 +190,31 @@ HeadingField(
 )
 ```
 
+### CustomComponentField
+
+Render a frontend-registered custom settings component while still using the
+decorator-based schema.
+
+```python
+from shelfmark.core.settings_registry import CustomComponentField
+
+CustomComponentField(
+    key="request_policy_editor",
+    component="request_policy_grid",  # frontend registry key
+    label="Request Policy Rules",
+    description="Custom editor for policy defaults and matrix rules.",
+    value_fields=[
+        SelectField(key="REQUEST_POLICY_DEFAULT_EBOOK", label="Default Ebook Mode", default="download"),
+        SelectField(key="REQUEST_POLICY_DEFAULT_AUDIOBOOK", label="Default Audiobook Mode", default="download"),
+        TableField(key="REQUEST_POLICY_RULES", label="Rules", columns=_rule_columns, default=[]),
+    ],
+    wrap_in_field_wrapper=True,  # use standard FieldWrapper label/description layout
+)
+```
+
+When `value_fields` is provided, those backing fields are included in
+serialization/save/validation automatically and are hidden from the default renderer.
+
 ## Common Field Properties
 
 All field types support these common properties:
@@ -206,6 +231,7 @@ All field types support these common properties:
 | `requires_restart` | `bool` | `False` | Whether changes require container restart |
 | `show_when` | `dict` | `None` | Conditional visibility (see below) |
 | `disabled_when` | `dict` | `None` | Conditional disable (see below) |
+| `hidden_in_ui` | `bool` | `False` | Hide from default renderer but keep in schema/save path |
 
 ## Conditional Visibility
 

docs/oidc.md

@@ -0,0 +1,50 @@
+# OpenID Connect (OIDC) Authentication
+
+## Callback URL
+
+```
+https://<your-shelfmark-domain>/api/auth/oidc/callback
+```
+
+With a subpath (`URL_BASE=/shelfmark/`):
+
+```
+https://<your-shelfmark-domain>/shelfmark/api/auth/oidc/callback
+```
+
+The callback URL is constructed from the incoming request, so your reverse proxy must forward `X-Forwarded-Proto` and `X-Forwarded-Host` correctly. PKCE (S256) is used automatically.
+
+## Settings
+
+Configure in **Settings → Security → Authentication Method → OIDC**.
+
+| Setting | Description | Default |
+|---------|-------------|---------|
+| Discovery URL | `/.well-known/openid-configuration` endpoint | — |
+| Client ID | OAuth2 client ID | — |
+| Client Secret | OAuth2 client secret | — |
+| Scopes | Scopes to request. The group claim is added automatically when admin group authorization is enabled | `openid email profile` |
+| Group Claim Name | Claim containing user groups | `groups` |
+| Admin Group Name | Group granted admin access. Leave empty for database-only roles | — |
+| Use Admin Group for Authorization | Toggle group-based admin detection | `true` |
+| Auto-Provision Users | Create accounts on first login | `true` |
+| Login Button Label | Custom text for the sign-in button | — |
+
+Use **Test Connection** to verify discovery and client configuration before attempting login.
+
+## Environment Variables
+
+These optional environment variables control login page behavior when OIDC is enabled.
+
+| Variable | Description | Default |
+|----------|-------------|---------|
+| `HIDE_LOCAL_AUTH` | Hide the username/password login option, so only the OIDC button is shown | `false` |
+| `OIDC_AUTO_REDIRECT` | Automatically redirect to the OIDC provider instead of showing the login page | `false` |
+
+If both are enabled, users are redirected straight to the OIDC provider. On failure they return to the login page with an error message but no password fallback.
+
+## Troubleshooting
+
+- **Issuer validation failed** — The issuer in the token doesn't match the discovery document. Check your provider's external URL / issuer configuration.
+- **Callback URL mismatch** — Reverse proxy isn't forwarding `X-Forwarded-Proto` or `X-Forwarded-Host`, so the constructed callback URL doesn't match what's registered in the provider.
+- **Account not found** — Auto-provision is disabled and the user hasn't been pre-created by an admin.

docs/reverse-proxy.md

@@ -1,35 +1,147 @@
 # Reverse Proxy & Subpath Hosting
 
-Shelfmark can run behind a reverse proxy at the root path (recommended) or
-under a subpath like `/shelfmark`.
+Shelfmark can run behind a reverse proxy at the root path (recommended) or under a subpath like `/shelfmark`.
 
-## Subpath setup
+## Root path setup (Recommended)
 
-1) Set the base path in Shelfmark:
-- UI: Settings → Advanced → Base Path
-- Env var: `URL_BASE=/shelfmark`
+If you can serve Shelfmark at the root path (`https://shelfmark.example.com/`), leave `URL_BASE` empty. This is the simplest option and avoids extra subpath configuration.
 
-2) Configure your reverse proxy to forward the subpath to Shelfmark and
-**strip the prefix** before sending to the backend. The proxy must also allow
-WebSocket upgrades for Socket.IO.
+```nginx
+server {
+    listen 443 ssl;
+    server_name shelfmark.example.com;
 
-Example (Nginx-style):
-
-```
-location /shelfmark/ {
-  proxy_pass http://shelfmark:8084/;
-  proxy_http_version 1.1;
-  proxy_set_header Upgrade $http_upgrade;
-  proxy_set_header Connection "upgrade";
+    location / {
+        proxy_pass http://shelfmark:8084;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+    }
 }
 ```
 
-Notes:
-- Use a trailing slash on the `location` and `proxy_pass` to ensure the
-  `/shelfmark` prefix is removed.
-- Health checks still work at `/api/health` without the subpath.
+## Subpath setup
 
-## Root path setup
+Running Shelfmark under a subpath like `/shelfmark` is supported without extra rewrite rules.
 
-If you can serve Shelfmark at the root path (`https://shelfmark.example.com/`),
-leave `URL_BASE` empty. This is the simplest option.
+### 1. Set the base path in Shelfmark
+
+- **UI**: Settings → Advanced → Base Path → `/shelfmark/`
+- **Environment variable**: `URL_BASE=/shelfmark/`
+
+### 2. Configure your reverse proxy
+
+All Shelfmark paths (UI, API, assets, Socket.IO) are served under the base path. A single location block is enough.
+
+---
+
+### Without Authentication Proxy
+
+**Complete Nginx configuration for subpath deployment:**
+
+```nginx
+location /shelfmark/ {
+    proxy_pass http://shelfmark:8084/shelfmark/;
+    proxy_http_version 1.1;
+    proxy_set_header Host $host;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header X-Forwarded-Proto $scheme;
+    proxy_set_header X-Forwarded-Host $host;
+    proxy_set_header Upgrade $http_upgrade;
+    proxy_set_header Connection "upgrade";
+    proxy_read_timeout 86400;
+    proxy_send_timeout 86400;
+    proxy_buffering off;
+}
+```
+
+---
+
+### With Authentication Proxy (Authelia, Authentik, etc.)
+
+Shelfmark supports Proxy Authentication. When enabled, Shelfmark trusts the authenticated user from headers set by your auth proxy.
+
+#### Shelfmark Settings
+
+Configure in Settings → Security:
+
+| Setting | Value |
+|---------|-------|
+| Authentication Method | Proxy Authentication |
+| Proxy Auth User Header | `Remote-User` |
+| Proxy Auth Logout URL | `https://auth.example.com/logout` |
+| Proxy Auth Admin Group Header | `Remote-Groups` |
+| Proxy Auth Admin Group Name | `admins` (or your admin group) |
+
+#### Nginx Configuration with Authelia
+
+This example uses Authelia snippets. Adapt for your auth proxy.
+
+**Authelia auth request snippet** (`/etc/nginx/snippets/authelia-authrequest.conf`):
+
+```nginx
+location /authelia {
+    internal;
+    proxy_pass http://authelia:9091/api/authz/auth-request;
+    proxy_pass_request_body off;
+    proxy_set_header Content-Length "";
+    proxy_set_header Host $host;
+    proxy_set_header X-Original-URL $scheme://$http_host$request_uri;
+    proxy_set_header X-Original-Method $request_method;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header X-Forwarded-Proto $scheme;
+}
+```
+
+**Authelia location snippet** (`/etc/nginx/snippets/authelia-location.conf`):
+
+```nginx
+auth_request /authelia;
+auth_request_set $target_url $scheme://$http_host$request_uri;
+auth_request_set $user $upstream_http_remote_user;
+auth_request_set $groups $upstream_http_remote_groups;
+auth_request_set $name $upstream_http_remote_name;
+auth_request_set $email $upstream_http_remote_email;
+proxy_set_header Remote-User $user;
+proxy_set_header Remote-Groups $groups;
+proxy_set_header Remote-Name $name;
+proxy_set_header Remote-Email $email;
+error_page 401 =302 https://auth.example.com/?rd=$target_url;
+```
+
+**Complete Nginx configuration with Authelia:**
+
+```nginx
+# Include Authelia auth endpoint in your server block
+include /etc/nginx/snippets/authelia-authrequest.conf;
+
+# Main shelfmark location
+location /shelfmark/ {
+    include /etc/nginx/snippets/authelia-location.conf;
+
+    proxy_pass http://shelfmark:8084/shelfmark/;
+    proxy_http_version 1.1;
+    proxy_set_header Host $host;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header X-Forwarded-Proto $scheme;
+    proxy_set_header X-Forwarded-Host $host;
+    proxy_set_header Upgrade $http_upgrade;
+    proxy_set_header Connection "upgrade";
+    proxy_read_timeout 86400;
+    proxy_send_timeout 86400;
+    proxy_buffering off;
+}
+```
+
+---
+
+## Health checks
+
+Health checks work at `/shelfmark/api/health` when using a subpath configuration.

docs/url-search-parameters.md

@@ -19,6 +19,7 @@ http://your-server:8084/?q=harry+potter
 | `lang` | Filter by language (ISO 639-1 code) | `/?lang=en` |
 | `format` | Filter by file format | `/?format=epub` |
 | `content` | Filter by content type | `/?content=fiction` |
+| `content_type` | Select media type (`ebook` or `audiobook`) in Universal mode only | `/?q=dune&content_type=audiobook` |
 | `sort` | Sort order for results | `/?sort=newest` |
 
 ## Multiple Values
@@ -57,15 +58,21 @@ Some parameters support multiple values by repeating the parameter:
 /?q=science+fiction&sort=newest
 ```
 
+**Universal search as audiobook:**
+```
+/?q=dune&content_type=audiobook
+```
+
 ## Search Mode Behavior
 
 ### Direct Download Mode (default)
 
 All parameters are used to filter results from the direct download source.
+`content_type` is ignored in Direct mode.
 
 ### Universal Mode
 
-Only `q` and `sort` are used. Other parameters (author, title, format, etc.) are silently ignored since metadata providers have their own search capabilities.
+`q`, `sort`, and `content_type` are used. Other parameters (author, title, format, etc.) are silently ignored since metadata providers have their own search capabilities.
 
 ## Notes
 

docs/users-and-requests.md

@@ -0,0 +1,98 @@
+# Users & Requests
+
+Configure in **Settings → Users & Requests**.
+
+## Authentication Methods
+
+Shelfmark supports four authentication methods, configured in **Settings → Security**.
+
+### Local
+
+You create user accounts directly in Shelfmark with a username and password. At least one local admin account must exist before this mode can be enabled.
+
+### Proxy Authentication
+
+Your reverse proxy handles authentication and passes the username to Shelfmark via a header (e.g. `Remote-User`). Accounts are created automatically on first sign-in. If a local user with the same username already exists, the proxy identity will be linked to that account rather than creating a duplicate. Admin status can optionally be derived from a groups header.
+
+### OIDC (OpenID Connect)
+
+Users sign in through your identity provider. Accounts are created automatically on first login (unless auto-provisioning is disabled, in which case you need to pre-create them). If a local user with a matching verified email already exists, the OIDC identity will be linked to that account on first sign-in. Admin status can optionally be derived from a group claim.
+
+A local admin account is required as a fallback. See [OIDC](oidc.md) for provider setup.
+
+### Calibre-Web Database
+
+User accounts are synced from your Calibre-Web `app.db`. If a local user with a matching email already exists, the CWA identity will be linked to that account. Roles are kept in sync with CWA. Users removed from CWA are cleaned up on the next sync.
+
+Requires mounting your Calibre-Web `app.db` to `/auth/app.db`.
+
+## Per-User Settings
+
+Admins can configure per-user settings by editing a user in the user management panel. Non-admin users can also edit their own settings through **My Account** (accessible from the user menu). Admins control which sections are visible in My Account via the **Visible Self-Settings Sections** option.
+
+There are three categories of per-user settings:
+
+### Delivery Preferences
+
+Override where a user's downloads are sent. Options depend on the global output mode configuration:
+
+- **Output mode** — Folder, Email (SMTP), or BookLore (API)
+- **Destination** — A custom folder path for this user's ebook downloads
+- **Audiobook destination** — A custom folder path for audiobook downloads
+- **BookLore library/path** — Per-user BookLore target (when using BookLore output mode)
+- **Email recipient** — Per-user email address (when using Email output mode)
+
+### Notifications
+
+Users can configure personal notification routes, separate from the global notification settings. Each route targets a URL (e.g. an Apprise-compatible endpoint) and can be scoped to specific event types or all events.
+
+### Request Policy (admin-only)
+
+Admins can override the default ebook/audiobook modes and request rules for individual users. See [Per-User Overrides](#per-user-overrides) below.
+
+---
+
+## Requests
+
+The request system controls whether users can download directly or need admin approval first.
+
+### Policy Modes
+
+Each content type (ebook, audiobook) has a default mode that sets the baseline:
+
+| Mode | Behaviour |
+|------|-----------|
+| **Download** | Users download directly, no approval needed |
+| **Request Release** | Users pick a specific release, then submit it for admin approval |
+| **Request Book** | Users request the book itself — an admin picks the release and fulfils it |
+| **Blocked** | No downloads or requests allowed |
+
+### Settings
+
+| Setting | Description | Default |
+|---------|-------------|---------|
+| Enable Requests | Master toggle. When off, everyone downloads directly | Off |
+| Default Ebook Mode | Baseline mode for all ebook sources | Download |
+| Default Audiobook Mode | Baseline mode for all audiobook sources | Download |
+| Request Rules | Per-source overrides (see below) | None |
+| Max Pending Requests Per User | Open request limit per user | 20 |
+| Allow Notes on Requests | Let users attach a note when submitting | On |
+
+### Request Rules
+
+The rules matrix lets you override the mode for specific source + content type combinations. Rules can only be **equal to or more restrictive** than the content-type default — they cannot grant more access than the baseline.
+
+For example, if the default ebook mode is "Download", a rule can restrict a specific source to "Request Release" or "Blocked", but not the other way around. If no rule matches, the content-type default applies.
+
+### Per-User Overrides
+
+Admins can override the default ebook/audiobook modes and request rules for individual users. Per-user rules are overlaid on the global rules, not replacing them.
+
+### Request Lifecycle
+
+1. User submits a request (book or release level, depending on the resolved policy mode)
+2. Request appears in the admin request queue as **pending**
+3. Admin either **fulfils** (queues a download) or **rejects** the request
+4. For fulfilled requests, delivery state is tracked through the download pipeline
+5. If delivery fails, an admin can reopen the request to try a different release
+6. Users can cancel their own pending requests

entrypoint.sh

@@ -45,9 +45,9 @@ if is_truthy "$ENABLE_LOGGING_VALUE"; then
     LOG_DIR=${LOG_ROOT:-/var/log/}/shelfmark
     mkdir -p "$LOG_DIR"
     LOG_FILE="${LOG_DIR}/shelfmark_entrypoint.log"
-
-    # Cleanup any existing files or folders in the log directory
-    rm -rf "$LOG_DIR"/*
+    # Keep the previous entrypoint log instead of deleting all history on boot.
+    [ -f "${LOG_FILE}.prev" ] && rm -f "${LOG_FILE}.prev"
+    [ -f "$LOG_FILE" ] && mv "$LOG_FILE" "${LOG_FILE}.prev"
 fi
 
 (
@@ -127,14 +127,26 @@ USERNAME=$(getent passwd "$RUN_UID" | cut -d: -f1)
 echo "Username for UID $RUN_UID is $USERNAME"
 
 test_write() {
-    folder=$1
-    test_file=$folder/shelfmark_TEST_WRITE
-    mkdir -p $folder
-    (
-        echo 0123456789_TEST | sudo -E -u "$USERNAME" HOME=/app tee $test_file > /dev/null
-    )
-    FILE_CONTENT=$(cat $test_file || echo "")
-    rm -f $test_file
+    local folder=$1
+    local test_file="$folder/shelfmark_TEST_WRITE"
+    local FILE_CONTENT
+    local result
+    local result_text
+
+    if ! mkdir -p "$folder"; then
+        echo "Failed to create directory for write test: $folder"
+        return 1
+    fi
+
+    if ! (
+        echo 0123456789_TEST | gosu "$USERNAME" env HOME=/app tee "$test_file" > /dev/null
+    ); then
+        echo "Failed to write test file in $folder as $USERNAME"
+        return 1
+    fi
+
+    FILE_CONTENT=$(cat "$test_file" 2>/dev/null || echo "")
+    rm -f "$test_file"
     [ "$FILE_CONTENT" = "0123456789_TEST" ]
     result=$?
     if [ $result -eq 0 ]; then
@@ -148,6 +160,7 @@ test_write() {
 
 make_writable() {
     folder=$1
+    did_full_chown=0
     set +e
     test_write $folder
     is_writable=$?
@@ -158,31 +171,40 @@ make_writable() {
         echo "Folder $folder is not writable, changing ownership"
         change_ownership $folder
         chmod -R g+r,g+w $folder || echo "Failed to change group permissions for ${folder}, continuing..."
+        did_full_chown=1
     fi
     # Fix any misowned subdirectories/files (e.g., from previous runs as root)
-    if [ -d "$folder" ]; then
-        misowned_count=$(find "$folder" -mindepth 1 \( ! -user "$RUN_UID" -o ! -group "$RUN_GID" \) 2>/dev/null | wc -l)
-        if [ "$misowned_count" -gt 0 ]; then
-            echo "Fixing ownership of $misowned_count files/directories in $folder"
-            find "$folder" -mindepth 1 \( ! -user "$RUN_UID" -o ! -group "$RUN_GID" \) \
-                -exec chown "$RUN_UID:$RUN_GID" {} \; 2>/dev/null || true
-        fi
+    if [ "$did_full_chown" -eq 0 ] && [ -d "$folder" ]; then
+        echo "Checking for misowned files/directories in $folder"
+        # Stay on the same filesystem to avoid traversing mounted subpaths
+        # (for example read-only bind mounts under /app in dev setups).
+        find "$folder" -xdev -mindepth 1 \( ! -user "$RUN_UID" -o ! -group "$RUN_GID" \) \
+            -exec chown "$RUN_UID:$RUN_GID" {} + 2>/dev/null || true
     fi
     test_write $folder || echo "Failed to test write to ${folder}, continuing..."
 }
 
+fix_misowned() {
+    folder=$1
+    mkdir -p $folder
+    echo "Checking for misowned files/directories in $folder"
+    # Stay on the same filesystem to avoid traversing mounted subpaths
+    # (for example read-only bind mounts under /app in dev setups).
+    find "$folder" -xdev \( ! -user "$RUN_UID" -o ! -group "$RUN_GID" \) \
+        -exec chown "$RUN_UID:$RUN_GID" {} + 2>/dev/null || true
+}
+
 # Ensure proper ownership of application directories
 change_ownership() {
   folder=$1
   mkdir -p $folder
   echo "Changing ownership of $folder to $USERNAME:$RUN_GID"
-  chown -R "${RUN_UID}" "${folder}" || echo "Failed to change user ownership for ${folder}, continuing..."
-  chown -R ":${RUN_GID}" "${folder}" || echo "Failed to change group ownership for ${folder}, continuing..."
+  chown -R "${RUN_UID}:${RUN_GID}" "${folder}" || echo "Failed to change ownership for ${folder}, continuing..."
 }
 
-change_ownership /app
-change_ownership /var/log/shelfmark
-change_ownership /tmp/shelfmark
+fix_misowned /app
+fix_misowned /var/log/shelfmark
+fix_misowned /tmp/shelfmark
 
 # SeleniumBase (internal bypasser) writes a patched chromedriver binary (uc_driver)
 # into its own drivers directory. Some NAS/docker setups can apply restrictive ACLs
@@ -332,4 +354,4 @@ echo "Setting umask to $UMASK_VALUE"
 umask $UMASK_VALUE
 
 stop_file_logging
-exec sudo -E -u "$USERNAME" HOME=/app $command
+exec gosu "$USERNAME" env HOME=/app $command

package-lock.json

@@ -0,0 +1,22 @@
+{
+  "name": "shelfmark",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "devDependencies": {
+        "baseline-browser-mapping": "^2.9.19"
+      }
+    },
+    "node_modules/baseline-browser-mapping": {
+      "version": "2.9.19",
+      "resolved": "https://registry.npmjs.org/baseline-browser-mapping/-/baseline-browser-mapping-2.9.19.tgz",
+      "integrity": "sha512-ipDqC8FrAl/76p2SSWKSI+H9tFwm7vYqXQrItCuiVPt26Km0jS+NzSsBWAaBusvSbQcfJG+JitdMm+wZAgTYqg==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "baseline-browser-mapping": "dist/cli.js"
+      }
+    }
+  }
+}

package.json

@@ -0,0 +1,5 @@
+{
+  "devDependencies": {
+    "baseline-browser-mapping": "^2.9.19"
+  }
+}

readme.md

@@ -4,19 +4,26 @@ Formerly *Calibre Web Automated Book Downloader (CWABD)*
 
 <img src="src/frontend/public/logo.png" alt="Shelfmark" width="200">
 
-Shelfmark is a unified web interface for searching and aggregating books and audiobook downloads from multiple sources - all in one place. Works out of the box with popular web sources, no configuration required. Add metadata providers, additional release sources, and download clients to create a single hub for building your digital library.
+Shelfmark is a self-hosted web interface for searching and downloading books and audiobooks from multiple sources. Works out of the box with popular web sources, no configuration required. Add metadata providers, additional release sources, and download clients to build a single hub for your digital library. Supports multiple users with a built-in request system, so you can share your instance with others and let them browse and request books on their own.
 
-**Fully standalone** - no external dependencies required. Works great alongside library tools like [Calibre-Web-Automated](https://github.com/crocodilestick/Calibre-Web-Automated), [Booklore](https://github.com/booklore-app/booklore) or [Audiobookshelf](https://github.com/advplyr/audiobookshelf) for automatic import.
+**Fully standalone** - no external dependencies required. Works great alongside the following library tools, with support for automatic imports:
+- [Calibre](https://calibre-ebook.com/)
+- [Calibre-Web](https://github.com/janeczku/calibre-web)
+- [Calibre-Web-Automated](https://github.com/crocodilestick/Calibre-Web-Automated)
+- [Booklore](https://github.com/booklore-app/booklore)
+- [Audiobookshelf](https://github.com/advplyr/audiobookshelf)
 
 ## ✨ Features
 
 - **One-Stop Interface** - A clean, modern UI to search, browse, and download from multiple sources in one place
-- **Multiple sources** - Popular archive websites, Torrent, Usenet and IRC download support
-- **Audiobook support** - Full audiobook search and download with dedicated processing
-- **Real-Time Progress** - Unified download queue with live status updates across all sources
+- **Multiple Sources** - Popular archive websites, Torrent, Usenet, and IRC download support
+- **Audiobook Support** - Full audiobook search and download with dedicated processing
 - **Two Search Modes**:
   - **Direct** - Search popular web sources
   - **Universal** - Search metadata providers (Hardcover, Open Library) for richer book and audiobook discovery, with multi-source downloads
+- **Multi-User & Requests** - Share your instance with others, let users browse and request books, and manage approvals with configurable notifications
+- **Authentication** - Built-in login, OIDC single sign-on, proxy auth, and Calibre-Web database support
+- **Real-Time Progress** - Unified download queue with live status updates across all sources
 - **Cloudflare Bypass** - Built-in bypasser for reliable access to protected sources
 
 ## 🖼️ Screenshots
@@ -101,6 +108,7 @@ See the full [Environment Variables Reference](docs/environment-variables.md) fo
 Some of the additional options available in Settings:
 - **Fast Download Key** - Use your paid account to skip Cloudflare challenges entirely and use faster, direct downloads
 - **Prowlarr** - Configure indexers and download clients to download books and audiobooks
+- **AudiobookBay** - Web scraping source for audiobook torrents (audiobooks only)
 - **IRC** - Add details for IRC book sources and download directly from the UI
 - **Library Link** - Add a link to your Calibre-Web or Booklore instance in the UI header
 - **File processing** - Customiseable download paths, file renaming and directory creation with template-based renaming
@@ -134,7 +142,7 @@ A smaller image without the built-in Cloudflare bypasser. Ideal for:
 
 - **External bypassers** - Already running FlareSolverr or ByParr for other services
 - **Fast downloads** - Using fast download sources
-- **Alternative sources only** - Exclusively using Prowlarr, IRC, or other sources
+- **Alternative sources only** - Exclusively using Prowlarr, AudiobookBay, IRC, or other sources
 - **Audiobooks** - Using Shelfmark exclusively for audiobooks
 
 ```bash
@@ -146,7 +154,7 @@ If you need Cloudflare bypass with the Lite image, configure an external resolve
 
 ## 🔐 Authentication
 
-Authentication is optional but recommended for shared or exposed instances. Three authentication methods are available in Settings:
+Authentication is optional but recommended for shared or exposed instances. Multiple authentication methods are available in Settings:
 
 **1. Single Username/Password**
 
@@ -154,7 +162,11 @@ Authentication is optional but recommended for shared or exposed instances. Thre
 
 Proxy auth trusts headers set by your reverse proxy (e.g. `X-Auth-User`). Ensure Shelfmark is not directly exposed, and configure your proxy to strip/overwrite these headers for all inbound requests.
 
-**3. Calibre-Web Database**
+**3. OIDC (OpenID Connect)**
+
+Integrate with your identity provider (Authelia, Authentik, Keycloak, etc.) for single sign-on. Supports PKCE flow, auto-discovery, group-based admin mapping, and auto-provisioning of new users.
+
+**4. Calibre-Web Database**
 
 If you're running Calibre-Web, you can reuse its user database by mounting it:
 
@@ -163,6 +175,29 @@ volumes:
   - /path/to/calibre-web/app.db:/auth/app.db:ro
 ```
 
+### Multi-User Support
+
+With any authentication method enabled, Shelfmark supports multi-user management with admin/user roles. Users can have per-user settings for download destinations, email recipients, and notification preferences. Non-admin users only see their own downloads and can submit book requests for admin review. Admins can configure request policies per source to control whether users can download directly, must submit a request, or are blocked entirely.
+
+## Project Scope
+
+Shelfmark is a manual search and download tool, the entry point to your book library, not a library manager. It finds books, downloads them, and sends them to a configured destination. That's the full scope.
+
+Shelfmark intentionally does not:
+
+- **Track or manage your library** - it doesn't know or care what you already own
+- **Integrate with library software** - what happens after delivery is up to your library tool
+- **Monitor authors, series, or new releases** - there is no background automation
+- **Queue future downloads** - if a book isn't available now, Shelfmark won't watch for it
+
+These are non-goals, not missing features.
+
+## Contributing
+
+Shelfmark's core feature set is complete. Development focuses on stability, bug fixes, quality-of-life improvements, and refining the search experience. Contributions in these areas are welcome, please file issues or submit pull requests on GitHub.
+
+Feature requests that fall outside the project scope (library integration, automation, collection management) will be closed. If you're unsure whether something fits, open a discussion first.
+
 ## Health Monitoring
 
 The application exposes a health endpoint at `/api/health` (no authentication required). Add a health check to your compose:
@@ -201,57 +236,20 @@ make restart     # Restart container
 
 The frontend dev server proxies to the backend on port 8084.
 
-### Architecture
-
-```
-┌─────────────────────────────────────────────────────────────┐
-│                      Web Interface                          │
-│                 (React + TypeScript + Vite)                 │
-├─────────────────────────────────────────────────────────────┤
-│                      Flask Backend                          │
-│                   (REST API + WebSocket)                    │
-├───────────────────┬─────────────────────┬───────────────────┤
-│ Metadata Providers│   Download Queue    │  Cloudflare       │
-│                   │   & Orchestrator    │  Bypass           │
-├───────────────────┼─────────────────────┼───────────────────┤
-│ • Hardcover       │ • Task scheduling   │ • Internal        │
-│ • Open Library    │ • Progress tracking │ • External        │
-│                   │ • Retry logic       │   (FlareSolverr)  │
-├───────────────────┴─────────────────────┴───────────────────┤
-│                     Release Sources                         │
-├─────────────────────────────────────────────────────────────┤
-│ • Direct Download (Web Sources → Mirrors → Fallbacks)       │
-├─────────────────────────────────────────────────────────────┤
-│                     Network Layer                           │
-├─────────────────────────────────────────────────────────────┤
-│ • Auto DNS rotation  • Mirror failover  • Resume support    │
-└─────────────────────────────────────────────────────────────┘
-```
-
-The backend uses a plugin architecture. Metadata providers and release sources register via decorators and are automatically discovered.
-
-## Contributing
-
-Contributions are welcome! Please file issues or submit pull requests on GitHub.
-
-> **Note**: Additional release sources and download clients are under active development. Want to add support for your favorite source? Check out the plugin architecture above and submit a PR!
-
 ## License
 
 MIT License - see [LICENSE](LICENSE) for details.
 
-## ⚠️ Disclaimers
+## ⚠️ Disclaimer
 
-### Copyright Notice
+Shelfmark is a search interface that displays results from external metadata providers and sources. It does not host, store, or distribute any content. The developers are not responsible for how the tool is used or what is accessed through it.
 
-This tool can access various sources including those that might contain copyrighted material. Users are responsible for:
-- Ensuring they have the right to download requested materials
-- Respecting copyright laws and intellectual property rights
-- Using the tool in compliance with their local regulations
+Users are solely responsible for:
+- Ensuring they have the legal right to download any material they access
+- Complying with copyright laws and intellectual property rights in their jurisdiction
+- Understanding and accepting the terms of any sources they configure
 
-### Library Integration
-
-Downloads are written atomically (via intermediate `.crdownload` files) to prevent partial files from being ingested. However, if your library tool (CWA, Booklore, Calibre) is actively scanning or importing, there's a small chance of race conditions. If you experience database errors or import failures, try pausing your library's auto-import during bulk downloads.
+Use of this tool is entirely at your own risk.
 
 ## Support
 

requirements-base.txt

@@ -3,6 +3,7 @@ flask-cors
 flask-socketio
 python-socketio
 requests[socks]
+defusedxml
 beautifulsoup4
 tqdm
 dnspython
@@ -14,3 +15,5 @@ emoji
 rarfile
 qbittorrent-api
 transmission-rpc
+authlib>=1.6.6,<1.7
+apprise>=1.9.0

requirements-shelfmark.txt

@@ -1,5 +1,4 @@
 pyvirtualdisplay
 pyautogui
-selenium==4.39.0
 seleniumbase==4.45.10
 python-xlib

scripts/generate_env_docs.py

@@ -178,6 +178,12 @@ def _generate_bootstrap_env_docs() -> List[str]:
             "type": "boolean",
             "default": "false",
         },
+        {
+            "name": "ONBOARDING",
+            "description": "Show the onboarding wizard on first run. Set to false to skip (useful for ephemeral storage).",
+            "type": "boolean",
+            "default": "true",
+        },
     ]
 
     lines = [
@@ -216,6 +222,7 @@ def generate_env_docs() -> str:
     """Generate markdown documentation for all environment variables."""
     # Import settings modules to ensure all settings are registered
     import shelfmark.config.settings  # noqa: F401
+    import shelfmark.config.security  # noqa: F401
     import shelfmark.release_sources.irc.settings  # noqa: F401
     import shelfmark.release_sources.prowlarr.settings  # noqa: F401
     import shelfmark.metadata_providers.hardcover  # noqa: F401
@@ -304,7 +311,7 @@ def generate_env_docs() -> str:
 
 def _generate_tab_docs(tab, group_prefix: Optional[str] = None) -> List[str]:
     """Generate documentation for a single settings tab."""
-    from shelfmark.core.settings_registry import ActionButton, HeadingField
+    from shelfmark.core.settings_registry import ActionButton, CustomComponentField, HeadingField
 
     lines = []
 
@@ -321,7 +328,7 @@ def _generate_tab_docs(tab, group_prefix: Optional[str] = None) -> List[str]:
     env_fields = []
     for field in tab.fields:
         # Skip non-value fields
-        if isinstance(field, (ActionButton, HeadingField)):
+        if isinstance(field, (ActionButton, CustomComponentField, HeadingField)):
             continue
 
         # Skip fields that don't support ENV vars

scripts/test_clients.py

@@ -434,6 +434,10 @@ def test_rtorrent():
         version = client.system.library_version()
         print(f"  Connected to rTorrent {version}")
 
+        # default download directory test
+        default_dir = client.directory.default()
+        print(f"  Default download directory: {default_dir}")
+
         # Get torrent list
         torrents = client.download_list()
         print(f"  Active torrents: {len(torrents)}")
@@ -458,10 +462,13 @@ def test_rtorrent():
         torrent_id = "3B245504CF5F11BBDBE1201CEA6A6BF45AEE1BC0" # rtorrent uses uppercase hashes
         print(f"  Added test torrent: {torrent_id}")
 
+        torrents = client.download_list()
+        print(f"  Active torrents: {len(torrents)}")        
+
         torrent_list = client.d.multicall.filtered(
             "",
             "default",
-            f"equal=d.hash=,cat={torrent_id}",
+            f"equal={{d.hash=,cat={torrent_id}}}"
             "d.hash=",
             "d.state=",
             "d.completed_bytes=",
@@ -472,11 +479,22 @@ def test_rtorrent():
             "d.complete=",
         )
         torrent = torrent_list[0]
+
         if not torrent:
             print("  ERROR: Could not find added torrent in list")
             return False
         
-        
+        # let's test the base path call
+        details = client.d.multicall.filtered(
+            "",
+            "default",
+            f"equal=d.hash=,cat={torrent_id}",
+            "d.base_path=",
+        )
+
+        base_path = details[0][0] if details else None
+
+        print(f"  Base path: {base_path}")
         client.d.erase(torrent_id)
         print("  Removed test torrent")
 

shelfmark/api/websocket.py

@@ -4,7 +4,7 @@ import logging
 import threading
 from typing import Optional, Dict, Any, Callable, List
 
-from flask_socketio import SocketIO
+from flask_socketio import SocketIO, join_room, leave_room
 
 logger = logging.getLogger(__name__)
 
@@ -20,6 +20,10 @@ class WebSocketManager:
         self._on_first_connect_callbacks: List[Callable[[], None]] = []
         self._on_all_disconnect_callbacks: List[Callable[[], None]] = []
         self._needs_rewarm = False  # Flag to trigger warmup callbacks on next connect
+        self._user_rooms: Dict[str, int] = {}  # room_name -> ref count
+        self._sid_rooms: Dict[str, str] = {}  # sid -> room_name
+        self._rooms_lock = threading.Lock()
+        self._queue_status_fn: Optional[Callable] = None  # Reference to queue_status()
 
     def init_app(self, app, socketio: SocketIO):
         """Initialize the WebSocket manager with Flask-SocketIO instance."""
@@ -100,19 +104,86 @@ class WebSocketManager:
         """Check if WebSocket is enabled and ready."""
         return self._enabled and self.socketio is not None
 
+    def set_queue_status_fn(self, fn: Callable):
+        """Set the queue_status function reference for per-room filtering."""
+        self._queue_status_fn = fn
+
+    def _increment_user_room_locked(self, room: str):
+        self._user_rooms[room] = self._user_rooms.get(room, 0) + 1
+
+    def _decrement_user_room_locked(self, room: str):
+        count = self._user_rooms.get(room, 1) - 1
+        if count <= 0:
+            self._user_rooms.pop(room, None)
+        else:
+            self._user_rooms[room] = count
+
+    def _set_sid_room_locked(self, sid: str, room: Optional[str]):
+        current_room = self._sid_rooms.get(sid)
+        if current_room == room:
+            return
+
+        if current_room is not None:
+            leave_room(current_room, sid=sid)
+            if current_room.startswith("user_"):
+                self._decrement_user_room_locked(current_room)
+            self._sid_rooms.pop(sid, None)
+
+        if room is not None:
+            join_room(room, sid=sid)
+            self._sid_rooms[sid] = room
+            if room.startswith("user_"):
+                self._increment_user_room_locked(room)
+
+    def sync_user_room(self, sid: str, is_admin: bool, db_user_id: Optional[int] = None):
+        """Ensure a SID is in exactly one room matching the current session scope."""
+        room: Optional[str] = None
+        if is_admin:
+            room = "admins"
+        elif db_user_id is not None:
+            room = f"user_{db_user_id}"
+
+        with self._rooms_lock:
+            self._set_sid_room_locked(sid, room)
+
+    def join_user_room(self, sid: str, is_admin: bool, db_user_id: Optional[int] = None):
+        """Join the appropriate room based on user role."""
+        self.sync_user_room(sid, is_admin, db_user_id)
+
+    def leave_user_room(self, sid: str, is_admin: bool = False, db_user_id: Optional[int] = None):
+        """Leave whichever room the SID currently belongs to."""
+        del is_admin, db_user_id  # Backward-compatible signature; routing is SID-based.
+        with self._rooms_lock:
+            self._set_sid_room_locked(sid, None)
+
     def broadcast_status_update(self, status_data: Dict[str, Any]):
-        """Broadcast status update to all connected clients."""
+        """Broadcast status update to all connected clients, filtered by user room."""
         if not self.is_enabled():
             return
 
         try:
-            # When calling socketio.emit() outside event handlers, it broadcasts by default
-            self.socketio.emit('status_update', status_data)
-            logger.debug(f"Broadcasted status update to all clients")
+            # Admins (and no-auth users) get full status
+            self.socketio.emit('status_update', status_data, to="admins")
+
+            # Each user room gets filtered status
+            with self._rooms_lock:
+                active_rooms = list(self._user_rooms.keys())
+
+            if active_rooms and self._queue_status_fn:
+                for room in active_rooms:
+                    try:
+                        # Extract user_id from room name "user_123"
+                        uid = int(room.split("_", 1)[1])
+                        filtered = self._queue_status_fn(user_id=uid)
+                        self.socketio.emit('status_update', filtered, to=room)
+                    except Exception as e:
+                        logger.error(f"Failed to send status update for room {room}: {e}")
+
+            logger.debug("Broadcasted status update to all rooms")
         except Exception as e:
             logger.error(f"Error broadcasting status update: {e}")
 
-    def broadcast_download_progress(self, book_id: str, progress: float, status: str):
+    def broadcast_download_progress(self, book_id: str, progress: float, status: str, user_id: Optional[int] = None):
         """Broadcast download progress update for a specific book."""
         if not self.is_enabled():
             return
@@ -123,8 +194,14 @@ class WebSocketManager:
                 'progress': progress,
                 'status': status
             }
-            # When calling socketio.emit() outside event handlers, it broadcasts by default
-            self.socketio.emit('download_progress', data)
+            # Admins always see all progress
+            self.socketio.emit('download_progress', data, to="admins")
+            # If task belongs to a specific user, send to their room too
+            if user_id is not None:
+                room = f"user_{user_id}"
+                with self._rooms_lock:
+                    if room in self._user_rooms:
+                        self.socketio.emit('download_progress', data, to=room)
             logger.debug(f"Broadcasted progress for book {book_id}: {progress}%")
         except Exception as e:
             logger.error(f"Error broadcasting download progress: {e}")

shelfmark/bypass/external_bypasser.py

@@ -11,6 +11,7 @@ from shelfmark.bypass import BypassCancelledException
 from shelfmark.core.config import config
 from shelfmark.core.logger import setup_logger
 from shelfmark.core.utils import normalize_http_url
+from shelfmark.download.network import get_ssl_verify
 
 if TYPE_CHECKING:
     from shelfmark.download import network
@@ -46,7 +47,8 @@ def _fetch_via_bypasser(target_url: str) -> Optional[str]:
             f"{bypasser_url}{bypasser_path}",
             headers={"Content-Type": "application/json"},
             json={"cmd": "request.get", "url": target_url, "maxTimeout": bypasser_timeout},
-            timeout=(CONNECT_TIMEOUT, read_timeout)
+            timeout=(CONNECT_TIMEOUT, read_timeout),
+            verify=get_ssl_verify(bypasser_url),
         )
         response.raise_for_status()
         result = response.json()

shelfmark/config/email_settings.py

@@ -0,0 +1,42 @@
+from __future__ import annotations
+
+from typing import Any
+
+from shelfmark.core.config import config
+from shelfmark.download.outputs.email import EmailOutputError, build_email_smtp_config, test_smtp_connection
+
+
+def test_email_connection(current_values: dict[str, Any] | None = None) -> dict[str, Any]:
+    """Test SMTP connectivity using current form values (including unsaved changes)."""
+
+    current_values = current_values or {}
+
+    def _get_value(key: str, default: Any = None) -> Any:
+        value = current_values.get(key)
+        if value not in (None, ""):
+            return value
+        if default is None:
+            return config.get(key)
+        return config.get(key, default)
+
+    settings = {
+        "EMAIL_SMTP_HOST": _get_value("EMAIL_SMTP_HOST", ""),
+        "EMAIL_SMTP_PORT": _get_value("EMAIL_SMTP_PORT", 587),
+        "EMAIL_SMTP_SECURITY": _get_value("EMAIL_SMTP_SECURITY", "starttls"),
+        "EMAIL_SMTP_USERNAME": _get_value("EMAIL_SMTP_USERNAME", ""),
+        "EMAIL_SMTP_PASSWORD": _get_value("EMAIL_SMTP_PASSWORD", ""),
+        "EMAIL_FROM": _get_value("EMAIL_FROM", ""),
+        "EMAIL_SUBJECT_TEMPLATE": _get_value("EMAIL_SUBJECT_TEMPLATE", "{Title}"),
+        "EMAIL_SMTP_TIMEOUT_SECONDS": _get_value("EMAIL_SMTP_TIMEOUT_SECONDS", 60),
+        "EMAIL_ALLOW_UNVERIFIED_TLS": _get_value("EMAIL_ALLOW_UNVERIFIED_TLS", False),
+    }
+
+    try:
+        smtp_config = build_email_smtp_config(settings)
+        test_smtp_connection(smtp_config)
+        return {"success": True, "message": "Connected to SMTP server"}
+    except EmailOutputError as exc:
+        return {"success": False, "message": str(exc)}
+    except Exception as exc:
+        return {"success": False, "message": f"SMTP test failed: {exc}"}
+

shelfmark/config/env.py

@@ -113,7 +113,10 @@ FLASK_PORT = int(os.getenv("FLASK_PORT", "8084"))
 # =============================================================================
 
 SESSION_COOKIE_SECURE_ENV = os.getenv("SESSION_COOKIE_SECURE", "false")
+SESSION_COOKIE_NAME = "shelfmark_session"
 CWA_DB_PATH = _resolve_cwa_db_path()
+HIDE_LOCAL_AUTH = string_to_bool(os.getenv("HIDE_LOCAL_AUTH", "false"))
+OIDC_AUTO_REDIRECT = string_to_bool(os.getenv("OIDC_AUTO_REDIRECT", "false"))
 
 
 # =============================================================================
@@ -133,6 +136,14 @@ TOR_VARIANT_AVAILABLE = shutil.which("tor") is not None
 USING_TOR = string_to_bool(os.getenv("USING_TOR", "false"))
 
 
+# =============================================================================
+# Onboarding
+# =============================================================================
+
+# Set to false to skip the onboarding wizard entirely (useful for ephemeral storage)
+ONBOARDING = string_to_bool(os.getenv("ONBOARDING", "true"))
+
+
 # =============================================================================
 # Debug/development settings
 # =============================================================================

shelfmark/config/migrations.py

@@ -0,0 +1,135 @@
+"""Configuration migration helpers."""
+
+import json
+from typing import Any, Callable
+
+
+_DEPRECATED_SETTINGS_RESTRICTION_KEYS = (
+    "PROXY_AUTH_RESTRICT_SETTINGS_TO_ADMIN",
+    "CWA_RESTRICT_SETTINGS_TO_ADMIN",
+    "RESTRICT_SETTINGS_TO_ADMIN",
+)
+
+
+def _as_bool(value: Any) -> bool:
+    if isinstance(value, bool):
+        return value
+    if isinstance(value, str):
+        return value.strip().lower() in {"1", "true", "yes", "on"}
+    return bool(value)
+
+
+def _pick_legacy_settings_restriction(config: dict[str, Any]) -> bool | None:
+    """Pick the best legacy admin-restriction value to migrate."""
+    auth_method = str(config.get("AUTH_METHOD", "")).strip().lower()
+
+    if (
+        auth_method == "proxy"
+        and "PROXY_AUTH_RESTRICT_SETTINGS_TO_ADMIN" in config
+    ):
+        return _as_bool(config.get("PROXY_AUTH_RESTRICT_SETTINGS_TO_ADMIN"))
+
+    if auth_method == "cwa" and "CWA_RESTRICT_SETTINGS_TO_ADMIN" in config:
+        return _as_bool(config.get("CWA_RESTRICT_SETTINGS_TO_ADMIN"))
+
+    if "RESTRICT_SETTINGS_TO_ADMIN" in config:
+        return _as_bool(config.get("RESTRICT_SETTINGS_TO_ADMIN"))
+
+    if "PROXY_AUTH_RESTRICT_SETTINGS_TO_ADMIN" in config:
+        return _as_bool(config.get("PROXY_AUTH_RESTRICT_SETTINGS_TO_ADMIN"))
+
+    if "CWA_RESTRICT_SETTINGS_TO_ADMIN" in config:
+        return _as_bool(config.get("CWA_RESTRICT_SETTINGS_TO_ADMIN"))
+
+    return None
+
+
+def migrate_security_settings(
+    *,
+    load_security_config: Callable[[], dict[str, Any]],
+    load_users_config: Callable[[], dict[str, Any]],
+    save_users_config: Callable[[dict[str, Any]], None],
+    ensure_config_dir: Callable[[], None],
+    get_config_path: Callable[[], Any],
+    sync_builtin_admin_user: Callable[[str, str], None],
+    logger: Any,
+) -> None:
+    """Migrate legacy security keys and sync builtin admin credentials."""
+    try:
+        config = load_security_config()
+        users_config = load_users_config()
+        migrated_security = False
+        migrated_users = False
+
+        if "USE_CWA_AUTH" in config:
+            old_value = config.pop("USE_CWA_AUTH")
+            if "AUTH_METHOD" not in config:
+                if old_value:
+                    config["AUTH_METHOD"] = "cwa"
+                    logger.info("Migrated USE_CWA_AUTH=True to AUTH_METHOD='cwa'")
+                else:
+                    if config.get("BUILTIN_USERNAME") and config.get("BUILTIN_PASSWORD_HASH"):
+                        config["AUTH_METHOD"] = "builtin"
+                        logger.info("Migrated USE_CWA_AUTH=False to AUTH_METHOD='builtin'")
+                    else:
+                        config["AUTH_METHOD"] = "none"
+                        logger.info("Migrated USE_CWA_AUTH=False to AUTH_METHOD='none'")
+                migrated_security = True
+            else:
+                logger.info("Removed deprecated USE_CWA_AUTH setting (AUTH_METHOD already exists)")
+                migrated_security = True
+
+        # Backfill AUTH_METHOD for configs that have builtin credentials but
+        # were never migrated from USE_CWA_AUTH (e.g. dev builds that predated
+        # the AUTH_METHOD field).
+        if "AUTH_METHOD" not in config:
+            if config.get("BUILTIN_USERNAME") and config.get("BUILTIN_PASSWORD_HASH"):
+                config["AUTH_METHOD"] = "builtin"
+                migrated_security = True
+                logger.info(
+                    "Backfilled AUTH_METHOD='builtin' from legacy "
+                    "BUILTIN_USERNAME/BUILTIN_PASSWORD_HASH credentials"
+                )
+
+        if "RESTRICT_SETTINGS_TO_ADMIN" not in users_config:
+            legacy_restrict = _pick_legacy_settings_restriction(config)
+            if legacy_restrict is not None:
+                save_users_config({"RESTRICT_SETTINGS_TO_ADMIN": legacy_restrict})
+                migrated_users = True
+                logger.info(
+                    "Migrated legacy settings-admin restriction to users.RESTRICT_SETTINGS_TO_ADMIN="
+                    f"{legacy_restrict}"
+                )
+
+        for deprecated_key in _DEPRECATED_SETTINGS_RESTRICTION_KEYS:
+            if deprecated_key in config:
+                config.pop(deprecated_key, None)
+                migrated_security = True
+                logger.info(f"Removed deprecated security setting: {deprecated_key}")
+
+        try:
+            sync_builtin_admin_user(
+                config.get("BUILTIN_USERNAME", ""),
+                config.get("BUILTIN_PASSWORD_HASH", ""),
+            )
+        except Exception as exc:
+            logger.error(
+                "Failed to sync builtin credentials to users database during migration: "
+                f"{exc}"
+            )
+
+        if migrated_security:
+            ensure_config_dir()
+            config_path = get_config_path()
+            with open(config_path, "w") as f:
+                json.dump(config, f, indent=2)
+            logger.info("Security settings migration completed successfully")
+        elif migrated_users:
+            logger.info("Users settings migration completed successfully")
+        else:
+            logger.debug("No security settings migration needed")
+
+    except FileNotFoundError:
+        logger.debug("No existing security config file found - nothing to migrate")
+    except Exception as exc:
+        logger.error(f"Failed to migrate security settings: {exc}")

shelfmark/config/notifications_settings.py

@@ -0,0 +1,337 @@
+"""Notifications settings tab registration."""
+
+from __future__ import annotations
+
+import re
+from typing import Any
+from urllib.parse import urlsplit
+
+from shelfmark.core.notifications import NotificationEvent, send_test_notification
+from shelfmark.core.settings_registry import (
+    ActionButton,
+    HeadingField,
+    TableField,
+    load_config_file,
+    register_on_save,
+    register_settings,
+)
+
+_URL_SCHEME_RE = re.compile(r"^[a-zA-Z][a-zA-Z0-9+.-]*$")
+
+_ROUTE_EVENT_ALL = "all"
+_ADMIN_EVENT_OPTIONS = [
+    {"value": NotificationEvent.REQUEST_CREATED.value, "label": "New request submitted"},
+    {"value": NotificationEvent.REQUEST_FULFILLED.value, "label": "Request approved"},
+    {"value": NotificationEvent.REQUEST_REJECTED.value, "label": "Request rejected"},
+    {"value": NotificationEvent.DOWNLOAD_COMPLETE.value, "label": "Download complete"},
+    {"value": NotificationEvent.DOWNLOAD_FAILED.value, "label": "Download failed"},
+]
+_ROUTE_EVENT_OPTIONS = [
+    {"value": _ROUTE_EVENT_ALL, "label": "All"},
+    *_ADMIN_EVENT_OPTIONS,
+]
+_ROUTE_EVENT_ORDER = [option["value"] for option in _ROUTE_EVENT_OPTIONS]
+_ROUTE_EVENT_INDEX = {event: index for index, event in enumerate(_ROUTE_EVENT_ORDER)}
+_ALLOWED_ROUTE_EVENTS = set(_ROUTE_EVENT_ORDER)
+
+_DEFAULT_ROUTE_ROWS = [{"event": [_ROUTE_EVENT_ALL], "url": ""}]
+
+
+def _looks_like_apprise_url(url: str) -> bool:
+    split = urlsplit(url)
+    if not split.scheme:
+        return False
+    if not _URL_SCHEME_RE.match(split.scheme):
+        return False
+    return " " not in url
+
+
+def _coerce_route_rows(value: Any) -> list[dict[str, Any]]:
+    if value is None:
+        return []
+    if isinstance(value, list):
+        return [row for row in value if isinstance(row, dict)]
+    if isinstance(value, dict):
+        return [value]
+    return []
+
+
+def _coerce_route_event_values(value: Any) -> list[Any]:
+    if isinstance(value, list):
+        return value
+    if isinstance(value, (tuple, set)):
+        return list(value)
+    return [value]
+
+
+def _normalize_route_events(value: Any) -> list[str]:
+    normalized: list[str] = []
+    seen: set[str] = set()
+
+    for raw_event in _coerce_route_event_values(value):
+        event = str(raw_event or "").strip().lower()
+        if not event or event not in _ALLOWED_ROUTE_EVENTS:
+            continue
+        if event in seen:
+            continue
+        seen.add(event)
+        normalized.append(event)
+
+    if _ROUTE_EVENT_ALL in seen:
+        return [_ROUTE_EVENT_ALL]
+
+    return sorted(normalized, key=lambda event: _ROUTE_EVENT_INDEX[event])
+
+
+def _normalize_routes(value: Any) -> list[dict[str, Any]]:
+    normalized: list[dict[str, Any]] = []
+    seen: set[tuple[tuple[str, ...], str]] = set()
+
+    for row in _coerce_route_rows(value):
+        events = _normalize_route_events(row.get("event"))
+        if not events:
+            continue
+
+        url = str(row.get("url") or "").strip()
+        key = (tuple(events), url)
+        if key in seen:
+            continue
+        seen.add(key)
+
+        normalized.append({"event": events, "url": url})
+
+    return normalized
+
+
+def _count_invalid_route_events(value: Any) -> int:
+    invalid = 0
+    for row in _coerce_route_rows(value):
+        raw_events = _coerce_route_event_values(row.get("event"))
+        if not raw_events:
+            invalid += 1
+            continue
+
+        for raw_event in raw_events:
+            event = str(raw_event or "").strip().lower()
+            if not event or event not in _ALLOWED_ROUTE_EVENTS:
+                invalid += 1
+    return invalid
+
+
+def _count_invalid_route_urls(routes: list[dict[str, Any]]) -> int:
+    return sum(1 for row in routes if row["url"] and not _looks_like_apprise_url(row["url"]))
+
+
+def _ensure_default_route_row(routes: list[dict[str, Any]]) -> list[dict[str, Any]]:
+    return routes if routes else [dict(row) for row in _DEFAULT_ROUTE_ROWS]
+
+
+def _extract_unique_route_urls(routes: list[dict[str, Any]]) -> list[str]:
+    urls: list[str] = []
+    seen: set[str] = set()
+    for row in routes:
+        url = row.get("url", "")
+        if not url:
+            continue
+        if url in seen:
+            continue
+        seen.add(url)
+        urls.append(url)
+    return urls
+
+
+def build_notification_test_result(routes_input: Any, *, scope_label: str) -> dict[str, Any]:
+    invalid_event_count = _count_invalid_route_events(routes_input)
+    if invalid_event_count:
+        return {
+            "success": False,
+            "message": (
+                f"Found {invalid_event_count} invalid {scope_label} notification route event value(s). "
+                "Fix route events before running a test."
+            ),
+        }
+
+    normalized_routes = _normalize_routes(routes_input)
+    invalid_url_count = _count_invalid_route_urls(normalized_routes)
+    if invalid_url_count:
+        return {
+            "success": False,
+            "message": (
+                f"Found {invalid_url_count} invalid {scope_label} notification URL(s). "
+                "Fix route URLs before running a test."
+            ),
+        }
+
+    urls = _extract_unique_route_urls(normalized_routes)
+    if not urls:
+        return {
+            "success": False,
+            "message": f"Add at least one {scope_label} notification URL route first.",
+        }
+
+    return send_test_notification(urls)
+
+
+def normalize_notification_routes(value: Any) -> list[dict[str, Any]]:
+    """Normalize route table rows for notification preferences."""
+    return _normalize_routes(value)
+
+
+def is_valid_notification_url(url: str) -> bool:
+    """Shared URL validation for notifications preferences."""
+    return _looks_like_apprise_url(url)
+
+
+def _on_save_notifications(values: dict[str, Any]) -> dict[str, Any]:
+    existing = load_config_file("notifications")
+    effective: dict[str, Any] = dict(existing)
+    effective.update(values)
+
+    admin_routes_input = effective.get("ADMIN_NOTIFICATION_ROUTES", [])
+    invalid_admin_event_count = _count_invalid_route_events(admin_routes_input)
+    if invalid_admin_event_count:
+        return {
+            "error": True,
+            "message": (
+                f"Found {invalid_admin_event_count} invalid global notification route event value(s)."
+            ),
+            "values": values,
+        }
+
+    normalized_admin_routes = _normalize_routes(admin_routes_input)
+    invalid_admin_url_count = _count_invalid_route_urls(normalized_admin_routes)
+    if invalid_admin_url_count:
+        return {
+            "error": True,
+            "message": (
+                f"Found {invalid_admin_url_count} invalid global notification URL(s). "
+                "Use URL values with a valid scheme, e.g. discord://... or ntfys://..."
+            ),
+            "values": values,
+        }
+
+    user_routes_input = effective.get("USER_NOTIFICATION_ROUTES", [])
+    invalid_user_event_count = _count_invalid_route_events(user_routes_input)
+    if invalid_user_event_count:
+        return {
+            "error": True,
+            "message": (
+                f"Found {invalid_user_event_count} invalid personal notification route event value(s)."
+            ),
+            "values": values,
+        }
+
+    normalized_user_routes = _normalize_routes(user_routes_input)
+    invalid_user_url_count = _count_invalid_route_urls(normalized_user_routes)
+    if invalid_user_url_count:
+        return {
+            "error": True,
+            "message": (
+                f"Found {invalid_user_url_count} invalid personal notification URL(s). "
+                "Use URL values with a valid scheme, e.g. discord://... or ntfys://..."
+            ),
+            "values": values,
+        }
+
+    admin_routes_touched = "ADMIN_NOTIFICATION_ROUTES" in values
+    if admin_routes_touched:
+        values["ADMIN_NOTIFICATION_ROUTES"] = _ensure_default_route_row(normalized_admin_routes)
+
+    user_routes_touched = "USER_NOTIFICATION_ROUTES" in values
+    if user_routes_touched:
+        values["USER_NOTIFICATION_ROUTES"] = _ensure_default_route_row(normalized_user_routes)
+
+    return {"error": False, "values": values}
+
+
+def _test_admin_notification_action(current_values: dict[str, Any]) -> dict[str, Any]:
+    persisted = load_config_file("notifications")
+    effective: dict[str, Any] = dict(persisted)
+    if isinstance(current_values, dict):
+        effective.update(current_values)
+
+    routes_input = effective.get("ADMIN_NOTIFICATION_ROUTES", [])
+    return build_notification_test_result(routes_input, scope_label="global")
+
+
+register_on_save("notifications", _on_save_notifications)
+
+
+@register_settings("notifications", "Notifications", icon="bell", order=7)
+def notifications_settings():
+    """Global notifications settings."""
+    return [
+        HeadingField(
+            key="notifications_heading",
+            title="Global Notifications",
+            description=(
+                "Global notifications send selected events for all users to configured routes. "
+                "Users can manage personal notifications in User Preferences."
+            ),
+        ),
+        TableField(
+            key="ADMIN_NOTIFICATION_ROUTES",
+            label="",
+            description=(
+                "Create one route per URL. Start with All, then add event-specific routes "
+                "for targeted delivery. Need format examples? "
+                "[View Apprise URL formats](https://appriseit.com/services/)."
+            ),
+            columns=[
+                {
+                    "key": "event",
+                    "label": "Event",
+                    "type": "multiselect",
+                    "options": _ROUTE_EVENT_OPTIONS,
+                    "defaultValue": [_ROUTE_EVENT_ALL],
+                    "placeholder": "Select events...",
+                },
+                {
+                    "key": "url",
+                    "label": "Notification URL",
+                    "type": "text",
+                    "placeholder": "e.g. ntfys://ntfy.sh/shelfmark",
+                },
+            ],
+            default=[dict(row) for row in _DEFAULT_ROUTE_ROWS],
+            add_label="Add Route",
+            empty_message="No routes configured.",
+        ),
+        ActionButton(
+            key="test_admin_notification",
+            label="Test Notification",
+            description="Send a test notification to all configured global route URLs.",
+            style="primary",
+            callback=_test_admin_notification_action,
+        ),
+        TableField(
+            key="USER_NOTIFICATION_ROUTES",
+            label="",
+            description=(
+                "Create one route per URL. Start with All, then add event-specific routes "
+                "for targeted delivery. Need format examples? "
+                "[View Apprise URL formats](https://appriseit.com/services/)."
+            ),
+            columns=[
+                {
+                    "key": "event",
+                    "label": "Event",
+                    "type": "multiselect",
+                    "options": _ROUTE_EVENT_OPTIONS,
+                    "defaultValue": [_ROUTE_EVENT_ALL],
+                    "placeholder": "Select events...",
+                },
+                {
+                    "key": "url",
+                    "label": "Notification URL",
+                    "type": "text",
+                    "placeholder": "e.g. ntfys://ntfy.sh/username-topic",
+                },
+            ],
+            default=[dict(row) for row in _DEFAULT_ROUTE_ROWS],
+            add_label="Add Route",
+            empty_message="No routes configured.",
+            user_overridable=True,
+            hidden_in_ui=True,
+        ),
+    ]

shelfmark/config/security.py

@@ -1,9 +1,12 @@
 """Authentication settings registration."""
 
-from typing import Any, Dict
-
-from werkzeug.security import generate_password_hash
+from typing import Any, Dict, Callable
 
+from shelfmark.config.migrations import migrate_security_settings
+from shelfmark.config.security_handlers import (
+    on_save_security,
+    test_oidc_connection,
+)
 from shelfmark.core.logger import setup_logger
 from shelfmark.core.settings_registry import (
     register_settings,
@@ -14,151 +17,55 @@ from shelfmark.core.settings_registry import (
     PasswordField,
     CheckboxField,
     ActionButton,
+    TagListField,
+    CustomComponentField,
 )
+from shelfmark.core.user_db import sync_builtin_admin_user
 
 logger = setup_logger(__name__)
 
 
+def _auth_condition(auth_method: str) -> dict[str, str]:
+    return {"field": "AUTH_METHOD", "value": auth_method}
+
+
+def _auth_field(factory: Callable[..., Any], auth_method: str, **kwargs: Any) -> Any:
+    return factory(show_when=_auth_condition(auth_method), **kwargs)
+
+
 def _migrate_security_settings() -> None:
-    import json
-    from shelfmark.core.settings_registry import _get_config_file_path, _ensure_config_dir
+    from shelfmark.core.settings_registry import (
+        _get_config_file_path,
+        _ensure_config_dir,
+        save_config_file,
+    )
 
-    try:
-        config = load_config_file("security")
-        migrated = False
-        
-        # Migrate USE_CWA_AUTH to AUTH_METHOD
-        if "USE_CWA_AUTH" in config:
-            old_value = config.pop("USE_CWA_AUTH")
-            
-            # Only set AUTH_METHOD if it doesn't already exist
-            if "AUTH_METHOD" not in config:
-                if old_value:
-                    config["AUTH_METHOD"] = "cwa"
-                    logger.info("Migrated USE_CWA_AUTH=True to AUTH_METHOD='cwa'")
-                else:
-                    # If USE_CWA_AUTH was False, determine auth method from credentials
-                    if config.get("BUILTIN_USERNAME") and config.get("BUILTIN_PASSWORD_HASH"):
-                        config["AUTH_METHOD"] = "builtin"
-                        logger.info("Migrated USE_CWA_AUTH=False to AUTH_METHOD='builtin'")
-                    else:
-                        config["AUTH_METHOD"] = "none"
-                        logger.info("Migrated USE_CWA_AUTH=False to AUTH_METHOD='none'")
-                migrated = True
-            else:
-                logger.info("Removed deprecated USE_CWA_AUTH setting (AUTH_METHOD already exists)")
-                migrated = True
-        
-        # Migrate RESTRICT_SETTINGS_TO_ADMIN to CWA_RESTRICT_SETTINGS_TO_ADMIN
-        if "RESTRICT_SETTINGS_TO_ADMIN" in config:
-            old_value = config.pop("RESTRICT_SETTINGS_TO_ADMIN")
-            
-            # Only migrate if new key doesn't exist
-            if "CWA_RESTRICT_SETTINGS_TO_ADMIN" not in config:
-                config["CWA_RESTRICT_SETTINGS_TO_ADMIN"] = old_value
-                logger.info(f"Migrated RESTRICT_SETTINGS_TO_ADMIN={old_value} to CWA_RESTRICT_SETTINGS_TO_ADMIN={old_value}")
-                migrated = True
-            else:
-                logger.info("Removed deprecated RESTRICT_SETTINGS_TO_ADMIN setting (CWA_RESTRICT_SETTINGS_TO_ADMIN already exists)")
-                migrated = True
-        
-        # Save config if any migrations occurred
-        if migrated:
-            _ensure_config_dir("security")
-            config_path = _get_config_file_path("security")
-            with open(config_path, 'w') as f:
-                json.dump(config, f, indent=2)
-            logger.info("Security settings migration completed successfully")
-        else:
-            logger.debug("No security settings migration needed")
-    
-    except FileNotFoundError:
-        logger.debug("No existing security config file found - nothing to migrate")
-    except Exception as e:
-        logger.error(f"Failed to migrate security settings: {e}")
+    migrate_security_settings(
+        load_security_config=lambda: load_config_file("security"),
+        load_users_config=lambda: load_config_file("users"),
+        save_users_config=lambda values: save_config_file("users", values),
+        ensure_config_dir=lambda: _ensure_config_dir("security"),
+        get_config_path=lambda: _get_config_file_path("security"),
+        sync_builtin_admin_user=sync_builtin_admin_user,
+        logger=logger,
+    )
 
 
-def _clear_builtin_credentials() -> Dict[str, Any]:
-    """Clear built-in credentials to allow public access."""
-    import json
-    from shelfmark.core.settings_registry import _get_config_file_path, _ensure_config_dir
-
-    try:
-        config = load_config_file("security")
-        config.pop("BUILTIN_USERNAME", None)
-        config.pop("BUILTIN_PASSWORD_HASH", None)
-
-        _ensure_config_dir("security")
-        config_path = _get_config_file_path("security")
-        with open(config_path, 'w') as f:
-            json.dump(config, f, indent=2)
-
-        logger.info("Cleared credentials")
-        return {"success": True, "message": "Credentials cleared. The app is now publicly accessible."}
-
-    except Exception as e:
-        logger.error(f"Failed to clear credentials: {e}")
-        return {"success": False, "message": f"Failed to clear credentials: {str(e)}"}
-
 
 def _on_save_security(values: Dict[str, Any]) -> Dict[str, Any]:
-    """
-    Custom save handler for security settings.
+    return on_save_security(values)
 
-    Handles password validation and hashing:
-    - If new password is provided, validate confirmation and hash it
-    - If password fields are empty, preserve existing hash
-    - Never store raw passwords
-    - Ensure username is present if password is set
 
-    Returns:
-        Dict with processed values to save and any validation errors.
-    """
-    password = values.get("BUILTIN_PASSWORD", "")
-    password_confirm = values.get("BUILTIN_PASSWORD_CONFIRM", "")
-
-    # Remove raw password fields - they should never be persisted
-    values.pop("BUILTIN_PASSWORD", None)
-    values.pop("BUILTIN_PASSWORD_CONFIRM", None)
-
-    # If password is provided, validate and hash it
-    if password:
-        if not values.get("BUILTIN_USERNAME"):
-            return {
-                "error": True,
-                "message": "Username cannot be empty",
-                "values": values
-            }
-
-        if password != password_confirm:
-            return {
-                "error": True,
-                "message": "Passwords do not match",
-                "values": values
-            }
-
-        if len(password) < 4:
-            return {
-                "error": True,
-                "message": "Password must be at least 4 characters",
-                "values": values
-            }
-
-        # Hash the password
-        values["BUILTIN_PASSWORD_HASH"] = generate_password_hash(password)
-        logger.info("Password hash updated")
-
-    # If no password provided but username is being set, preserve existing hash
-    elif "BUILTIN_USERNAME" in values:
-        existing = load_config_file("security")
-        if "BUILTIN_PASSWORD_HASH" in existing:
-            values["BUILTIN_PASSWORD_HASH"] = existing["BUILTIN_PASSWORD_HASH"]
-
-    return {"error": False, "values": values}
+def _test_oidc_connection(current_values: Dict[str, Any] = None) -> Dict[str, Any]:
+    return test_oidc_connection(
+        load_security_config=lambda: load_config_file("security"),
+        current_values=current_values or {},
+        logger=logger,
+    )
 
 
 @register_settings("security", "Security", icon="shield", order=5)
-def security_settings():  
+def security_settings():
     """Security and authentication settings."""
     from shelfmark.config.env import CWA_DB_PATH
 
@@ -166,125 +73,212 @@ def security_settings():
 
     auth_method_options = [
         {"label": "No Authentication", "value": "none"},
-        {"label": "Username/Password", "value": "builtin"},
+        {"label": "Local", "value": "builtin"},
         {"label": "Proxy Authentication", "value": "proxy"},
+        {"label": "OIDC (OpenID Connect)", "value": "oidc"},
+        {"label": "Calibre-Web Database", "value": "cwa"},
     ]
-    if cwa_db_available:
-        auth_method_options.append({"label": "Calibre-Web Database", "value": "cwa"})
-
-    auth_method_description = "Select the authentication method for accessing Shelfmark."
-    if not cwa_db_available:
-        auth_method_description += " Calibre-Web database option requires mounting your Calibre-Web app.db to /auth/app.db."
 
     fields = [
         SelectField(
             key="AUTH_METHOD",
             label="Authentication Method",
-            description=auth_method_description,
+            description="Select the authentication method for accessing Shelfmark.",
             options=auth_method_options,
             default="none",
-            env_supported=False,
         ),
-        TextField(
-            key="BUILTIN_USERNAME",
-            label="Username",
-            description="Set a username and password to require login. Leave both empty for public access.",
-            placeholder="Enter username",
-            env_supported=False,
-            show_when={"field": "AUTH_METHOD", "value": "builtin"},
+        CustomComponentField(
+            key="builtin_admin_requirement",
+            component="oidc_admin_hint",
+            label=(
+                "Local authentication is inactive until a local admin account with a "
+                "password is created."
+            ),
+            show_when=_auth_condition("builtin"),
         ),
-        PasswordField(
-            key="BUILTIN_PASSWORD",
-            label="Set Password",
-            description="Fill in to set or change the password.",
-            placeholder="Enter new password",
-            env_supported=False,
-            show_when={"field": "AUTH_METHOD", "value": "builtin"},
-        ),
-        PasswordField(
-            key="BUILTIN_PASSWORD_CONFIRM",
-            label="Confirm Password",
-            placeholder="Confirm new password",
-            env_supported=False,
-            show_when={"field": "AUTH_METHOD", "value": "builtin"},
+        CustomComponentField(
+            key="oidc_admin_requirement",
+            component="oidc_admin_hint",
+            label="A local admin account is required before OIDC can be enabled.",
+            show_when=_auth_condition("oidc"),
         ),
+        *([] if cwa_db_available else [
+            CustomComponentField(
+                key="cwa_db_missing",
+                component="oidc_admin_hint",
+                label=(
+                    "Calibre-Web database not detected. Mount your app.db to "
+                    "/auth/app.db to enable this method. Authentication will fall "
+                    "back to none until the database is available."
+                ),
+                show_when=_auth_condition("cwa"),
+            ),
+        ]),
         ActionButton(
-            key="clear_credentials",
-            label="Clear Credentials",
-            description="Remove login requirement and make the app publicly accessible.",
-            style="danger",
-            callback=_clear_builtin_credentials,
-            show_when={"field": "AUTH_METHOD", "value": "builtin"},
+            key="open_users_tab",
+            label="Go to Users",
+            description="Configure local users and admin access in the Users tab.",
+            style="primary",
+            show_when={"field": "AUTH_METHOD", "value": ["builtin", "oidc"]},
         ),
-        TextField(
+        _auth_field(
+            TextField,
+            "proxy",
             key="PROXY_AUTH_USER_HEADER",
             label="Proxy Auth User Header",
-            description=(
-                "The HTTP header your proxy uses to pass the authenticated username."
-            ),
+            description="The HTTP header your proxy uses to pass the authenticated username.",
             placeholder="e.g. X-Auth-User",
             default="X-Auth-User",
-            env_supported=False,
-            show_when={"field": "AUTH_METHOD", "value": "proxy"},
         ),
-        TextField(
+        _auth_field(
+            TextField,
+            "proxy",
             key="PROXY_AUTH_LOGOUT_URL",
             label="Proxy Auth Logout URL",
-            description=(
-                "The URL to redirect users to for logging out."
-                " Leave empty to disable logout functionality."
-            ),
+            description="The URL to redirect users to for logging out. Leave empty to disable logout functionality.",
             placeholder="https://myauth.example.com/logout",
             default="",
-            env_supported=False,
-            show_when={"field": "AUTH_METHOD", "value": "proxy"},
         ),
-        CheckboxField(
-            key="PROXY_AUTH_RESTRICT_SETTINGS_TO_ADMIN",
-            label="Restrict Settings to Admins authenticated via Proxy",
-            description=(
-                "Only users in the admin group can access settings."
-            ),
-            default=False,
-            env_supported=False,
-            show_when={"field": "AUTH_METHOD", "value": "proxy"},
-        ),
-        TextField(
+        _auth_field(
+            TextField,
+            "proxy",
             key="PROXY_AUTH_ADMIN_GROUP_HEADER",
             label="Proxy Auth Admin Group Header",
-            description=(
-                "The HTTP header your proxy uses to pass the user's groups/roles."
-            ),
+            description="Optional: header your proxy uses to pass user groups/roles.",
             placeholder="e.g. X-Auth-Groups",
             default="X-Auth-Groups",
-            env_supported=False,
-            show_when={"field": "PROXY_AUTH_RESTRICT_SETTINGS_TO_ADMIN", "value": True},
         ),
-        TextField(
+        _auth_field(
+            TextField,
+            "proxy",
             key="PROXY_AUTH_ADMIN_GROUP_NAME",
-            label="Proxy Auth Admin Group Name",
-            description=(
-                "The name of the group/role that should have admin access."
-            ),
+            label="Proxy Auth Admin Group",
+            description="Optional: users in this group are treated as admins. Leave blank to skip group-based admin detection.",
             placeholder="e.g. admins",
-            default="admins",
-            env_supported=False,
-            show_when={"field": "PROXY_AUTH_RESTRICT_SETTINGS_TO_ADMIN", "value": True},
-        ),
-        CheckboxField(
-            key="CWA_RESTRICT_SETTINGS_TO_ADMIN",
-            label="Restrict Settings to Admins authenticated via Calibre-Web",
-            description=(
-                "Only users with admin role in Calibre-Web can access settings."
-            ),
-            default=False,
-            env_supported=False,
-            show_when={"field": "AUTH_METHOD", "value": "cwa"},
+            default="",
         ),
     ]
 
+    fields.append(
+        CustomComponentField(
+            key="oidc_callback_url",
+            component="settings_label",
+            label="Callback URL",
+            description="{origin}/api/auth/oidc/callback",
+            show_when=_auth_condition("oidc"),
+        )
+    )
+
+    oidc_specs = [
+        (
+            TextField,
+            {
+                "key": "OIDC_DISCOVERY_URL",
+                "label": "Discovery URL",
+                "description": "OpenID Connect discovery endpoint URL. Usually ends with /.well-known/openid-configuration.",
+                "placeholder": "https://auth.example.com/.well-known/openid-configuration",
+                "required": True,
+            },
+        ),
+        (
+            TextField,
+            {
+                "key": "OIDC_CLIENT_ID",
+                "label": "Client ID",
+                "description": "OAuth2 client ID from your identity provider.",
+                "placeholder": "shelfmark",
+                "required": True,
+            },
+        ),
+        (
+            PasswordField,
+            {
+                "key": "OIDC_CLIENT_SECRET",
+                "label": "Client Secret",
+                "description": "OAuth2 client secret from your identity provider.",
+                "required": True,
+            },
+        ),
+        (
+            TagListField,
+            {
+                "key": "OIDC_SCOPES",
+                "label": "Scopes",
+                "description": "OAuth2 scopes to request from the identity provider. Managed automatically: includes essential scopes and the group claim when using admin group authorization.",
+                "default": ["openid", "email", "profile"],
+            },
+        ),
+        (
+            TextField,
+            {
+                "key": "OIDC_GROUP_CLAIM",
+                "label": "Group Claim Name",
+                "description": "The name of the claim in the ID token that contains user groups.",
+                "placeholder": "groups",
+                "default": "groups",
+            },
+        ),
+        (
+            TextField,
+            {
+                "key": "OIDC_ADMIN_GROUP",
+                "label": "Admin Group Name",
+                "description": "Users in this group will be given admin access (if enabled below). Leave empty to use database roles only.",
+                "placeholder": "shelfmark-admins",
+                "default": "",
+            },
+        ),
+        (
+            CheckboxField,
+            {
+                "key": "OIDC_USE_ADMIN_GROUP",
+                "label": "Use Admin Group for Authorization",
+                "description": "When enabled, users in the Admin Group are granted admin access. When disabled, admin access is determined solely by database roles.",
+                "default": True,
+            },
+        ),
+        (
+            CheckboxField,
+            {
+                "key": "OIDC_AUTO_PROVISION",
+                "label": "Auto-Provision Users",
+                "description": "Automatically create a user account on first OIDC login. When disabled, users must be pre-created by an admin.",
+                "default": True,
+            },
+        ),
+        (
+            TextField,
+            {
+                "key": "OIDC_BUTTON_LABEL",
+                "label": "Login Button Label",
+                "description": "Custom label for the OIDC sign-in button on the login page.",
+                "placeholder": "Sign in with OIDC",
+                "default": "",
+            },
+        ),
+    ]
+    fields.extend(_auth_field(factory, "oidc", **spec) for factory, spec in oidc_specs)
+    fields.append(
+        ActionButton(
+            key="test_oidc",
+            label="Test Connection",
+            description="Fetch the OIDC discovery document and validate configuration.",
+            style="primary",
+            callback=_test_oidc_connection,
+            show_when=_auth_condition("oidc"),
+        )
+    )
+    fields.append(
+        CustomComponentField(
+            key="oidc_env_info",
+            component="oidc_env_info",
+            label="Environment-Only Options",
+            description="These options can only be set via environment variables because changing them through the UI could lock you out of the application.",
+            wrap_in_field_wrapper=True,
+            show_when=_auth_condition("oidc"),
+        )
+    )
     return fields
 
 
-# Register the on_save handler for this tab
 register_on_save("security", _on_save_security)

shelfmark/config/security_handlers.py

@@ -0,0 +1,75 @@
+"""Operational handlers for security settings (save/actions)."""
+
+import os
+from typing import Any, Callable
+
+from shelfmark.core.utils import normalize_http_url
+from shelfmark.core.user_db import UserDB
+from shelfmark.download.network import get_ssl_verify
+
+
+_OIDC_LOCKOUT_MESSAGE = "A local admin account with a password is required before enabling OIDC. Use the 'Go to Users' button above to create one. This ensures you can still sign in if your identity provider is unavailable."
+
+
+def _has_local_password_admin() -> bool:
+    root = os.environ.get("CONFIG_DIR", "/config")
+    user_db = UserDB(os.path.join(root, "users.db"))
+    user_db.initialize()
+    return any(user.get("password_hash") and user.get("role") == "admin" for user in user_db.list_users())
+
+
+def on_save_security(
+    values: dict[str, Any],
+) -> dict[str, Any]:
+    """Validate security values before persistence."""
+    normalized_values = values.copy()
+
+    discovery_url = normalized_values.get("OIDC_DISCOVERY_URL")
+    if discovery_url is not None:
+        normalized_values["OIDC_DISCOVERY_URL"] = normalize_http_url(
+            str(discovery_url),
+            default_scheme="https",
+        )
+
+    proxy_logout_url = normalized_values.get("PROXY_AUTH_LOGOUT_URL")
+    if proxy_logout_url is not None:
+        normalized_values["PROXY_AUTH_LOGOUT_URL"] = normalize_http_url(
+            str(proxy_logout_url),
+            default_scheme="https",
+            strip_trailing_slash=False,
+        )
+
+    if normalized_values.get("AUTH_METHOD") == "oidc" and not _has_local_password_admin():
+        return {"error": True, "message": _OIDC_LOCKOUT_MESSAGE, "values": normalized_values}
+
+    return {"error": False, "values": normalized_values}
+
+
+def test_oidc_connection(
+    *,
+    load_security_config: Callable[[], dict[str, Any]],
+    current_values: dict[str, Any] | None = None,
+    logger: Any,
+) -> dict[str, Any]:
+    """Fetch and validate the configured OIDC discovery document."""
+    import requests
+
+    try:
+        # Prefer the current (unsaved) form value over the saved config
+        discovery_url = (current_values or {}).get("OIDC_DISCOVERY_URL") or load_security_config().get("OIDC_DISCOVERY_URL", "")
+        if not discovery_url:
+            return {"success": False, "message": "Discovery URL is not configured."}
+
+        response = requests.get(discovery_url, timeout=10, verify=get_ssl_verify(discovery_url))
+        response.raise_for_status()
+        document = response.json()
+
+        required_fields = ["issuer", "authorization_endpoint", "token_endpoint"]
+        missing_fields = [field for field in required_fields if field not in document]
+        if missing_fields:
+            return {"success": False, "message": f"Discovery document missing fields: {', '.join(missing_fields)}"}
+
+        return {"success": True, "message": f"Connected to {document['issuer']}"}
+    except Exception as exc:
+        logger.error(f"OIDC connection test failed: {exc}")
+        return {"success": False, "message": f"Connection failed: {str(exc)}"}

shelfmark/config/settings.py

@@ -69,6 +69,7 @@ from shelfmark.config.booklore_settings import (
     get_booklore_path_options,
     test_booklore_connection,
 )
+from shelfmark.config.email_settings import test_email_connection
 from shelfmark.core.logger import setup_logger
 
 logger = setup_logger(__name__)
@@ -125,6 +126,7 @@ from shelfmark.core.settings_registry import (
     CheckboxField,
     SelectField,
     MultiSelectField,
+    TagListField,
     OrderableListField,
     TableField,
     HeadingField,
@@ -178,6 +180,7 @@ _FORMAT_OPTIONS = [
 _AUDIOBOOK_FORMAT_OPTIONS = [
     {"value": "m4b", "label": "M4B"},
     {"value": "mp3", "label": "MP3"},
+    {"value": "m4a", "label": "M4A"},
     {"value": "zip", "label": "ZIP"},
     {"value": "rar", "label": "RAR"},
 ]
@@ -224,16 +227,30 @@ _LANGUAGE_OPTIONS = [{"value": lang["code"], "label": lang["language"]} for lang
 def _get_aa_base_url_options():
     """Build AA URL options dynamically, including additional mirrors from config."""
     from shelfmark.core.mirrors import DEFAULT_AA_MIRRORS, get_aa_mirrors
+    from shelfmark.core.config import config
+    from shelfmark.core.utils import normalize_http_url
 
     options = [{"value": "auto", "label": "Auto (Recommended)"}]
 
     # Get all mirrors (defaults + custom)
     all_mirrors = get_aa_mirrors()
 
+    # If AA_BASE_URL is configured to a custom mirror that isn't present in the
+    # defaults/additional list, include it so the UI can display the active value.
+    configured_url = normalize_http_url(
+        config.get("AA_BASE_URL", "auto"),
+        default_scheme="https",
+        allow_special=("auto",),
+    )
+    if configured_url and configured_url != "auto" and configured_url not in all_mirrors:
+        all_mirrors = [configured_url] + all_mirrors
+
     for url in all_mirrors:
         domain = url.replace("https://", "").replace("http://", "")
         is_custom = url not in DEFAULT_AA_MIRRORS
         label = f"{domain} (custom)" if is_custom else domain
+        if configured_url and url == configured_url and is_custom:
+            label = f"{domain} (configured)"
         options.append({"value": url, "label": label})
 
     return options
@@ -402,6 +419,7 @@ def search_mode_settings():
                 },
             ],
             default="direct",
+            user_overridable=True,
         ),
         SelectField(
             key="AA_DEFAULT_SORT",
@@ -424,6 +442,7 @@ def search_mode_settings():
             options=_get_metadata_provider_options,  # Callable - evaluated lazily to avoid circular imports
             default="openlibrary",
             show_when={"field": "SEARCH_MODE", "value": "universal"},
+            user_overridable=True,
         ),
         SelectField(
             key="METADATA_PROVIDER_AUDIOBOOK",
@@ -432,6 +451,7 @@ def search_mode_settings():
             options=_get_metadata_provider_options_with_none,  # Callable - includes "Use main provider" option
             default="",
             show_when={"field": "SEARCH_MODE", "value": "universal"},
+            user_overridable=True,
         ),
         SelectField(
             key="DEFAULT_RELEASE_SOURCE",
@@ -440,6 +460,7 @@ def search_mode_settings():
             options=_get_release_source_options,  # Callable - evaluated lazily to avoid circular imports
             default="direct_download",
             show_when={"field": "SEARCH_MODE", "value": "universal"},
+            user_overridable=True,
         ),
     ]
 
@@ -456,6 +477,17 @@ def network_settings():
     tor_overrides_network = tor_enabled  # Only override when Tor is actually active
 
     return [
+        SelectField(
+            key="CERTIFICATE_VALIDATION",
+            label="Certificate Validation",
+            description="Controls SSL/TLS certificate verification for outbound connections. Disable for self-signed certificates on internal services (e.g. OIDC providers, Prowlarr).",
+            options=[
+                {"value": "enabled", "label": "Enabled (Recommended)"},
+                {"value": "disabled_local", "label": "Disabled for Local Addresses"},
+                {"value": "disabled", "label": "Disabled"},
+            ],
+            default="enabled",
+        ),
         SelectField(
             key="CUSTOM_DNS",
             label="DNS Provider",
@@ -608,6 +640,108 @@ def _on_save_downloads(values: dict[str, Any]) -> dict[str, Any]:
                 "values": values,
             }
 
+    # Email output (SMTP) validation.
+    if books_output_mode == "email":
+        from email.utils import parseaddr
+
+        def _is_plain_email_address(addr: str) -> bool:
+            parsed = parseaddr(addr or "")[1]
+            return bool(parsed) and "@" in parsed and parsed == addr
+
+        # Preferred model: single recipient for global default and per-user override.
+        raw_recipient = str(effective.get("EMAIL_RECIPIENT", "") or "").strip()
+
+        # Optional global fallback: validate only when a default recipient is provided.
+        if raw_recipient and not _is_plain_email_address(raw_recipient):
+            return {
+                "error": True,
+                "message": "Email recipient must be a valid plain email address.",
+                "values": values,
+            }
+
+        smtp_host = str(effective.get("EMAIL_SMTP_HOST", "") or "").strip()
+        if not smtp_host:
+            return {"error": True, "message": "SMTP host is required", "values": values}
+
+        security = str(effective.get("EMAIL_SMTP_SECURITY", "starttls") or "").strip().lower()
+        if security not in {"none", "starttls", "ssl"}:
+            return {
+                "error": True,
+                "message": "SMTP security must be one of: none, starttls, ssl",
+                "values": values,
+            }
+
+        try:
+            port = int(effective.get("EMAIL_SMTP_PORT", 587))
+        except (TypeError, ValueError):
+            return {"error": True, "message": "SMTP port must be a number", "values": values}
+
+        if port < 1 or port > 65535:
+            return {"error": True, "message": "SMTP port must be between 1 and 65535", "values": values}
+
+        try:
+            timeout_seconds = int(effective.get("EMAIL_SMTP_TIMEOUT_SECONDS", 60))
+        except (TypeError, ValueError):
+            return {"error": True, "message": "SMTP timeout (seconds) must be a number", "values": values}
+
+        if timeout_seconds < 1:
+            return {"error": True, "message": "SMTP timeout (seconds) must be >= 1", "values": values}
+
+        username = str(effective.get("EMAIL_SMTP_USERNAME", "") or "").strip()
+        password = effective.get("EMAIL_SMTP_PASSWORD", "") or ""
+        if username and not password:
+            return {"error": True, "message": "SMTP password is required when username is set", "values": values}
+
+        try:
+            attachment_limit_mb = int(effective.get("EMAIL_ATTACHMENT_SIZE_LIMIT_MB", 25))
+        except (TypeError, ValueError):
+            return {
+                "error": True,
+                "message": "Attachment size limit (MB) must be a number",
+                "values": values,
+            }
+
+        if attachment_limit_mb < 1 or attachment_limit_mb > 600:
+            return {
+                "error": True,
+                "message": "Attachment size limit (MB) must be between 1 and 600",
+                "values": values,
+            }
+
+        from_addr = str(effective.get("EMAIL_FROM", "") or "").strip()
+        if not from_addr:
+            # If From is empty, default to the SMTP username when it looks like an email address.
+            username_email = parseaddr(username)[1]
+            if username_email and "@" in username_email:
+                from_addr = f"Shelfmark <{username_email}>"
+                values["EMAIL_FROM"] = from_addr
+            else:
+                return {
+                    "error": True,
+                    "message": "From address is required (or set SMTP username to an email address).",
+                    "values": values,
+                }
+        else:
+            from_email = parseaddr(from_addr)[1]
+            if not from_email or "@" not in from_email:
+                return {
+                    "error": True,
+                    "message": "From address must be a valid email address",
+                    "values": values,
+                }
+
+        # Persist any normalization/coercion for fields that may have been edited this save.
+        if "EMAIL_RECIPIENT" in values:
+            values["EMAIL_RECIPIENT"] = raw_recipient
+        if "EMAIL_SMTP_SECURITY" in values:
+            values["EMAIL_SMTP_SECURITY"] = security
+        if "EMAIL_SMTP_PORT" in values:
+            values["EMAIL_SMTP_PORT"] = port
+        if "EMAIL_SMTP_TIMEOUT_SECONDS" in values:
+            values["EMAIL_SMTP_TIMEOUT_SECONDS"] = timeout_seconds
+        if "EMAIL_ATTACHMENT_SIZE_LIMIT_MB" in values:
+            values["EMAIL_ATTACHMENT_SIZE_LIMIT_MB"] = attachment_limit_mb
+
     return {"error": False, "values": values}
 
 
@@ -632,6 +766,11 @@ def download_settings():
                     "label": "Folder",
                     "description": "Save files to the destination folder",
                 },
+                {
+                    "value": "email",
+                    "label": "Email (SMTP)",
+                    "description": "Send files as an email attachment",
+                },
                 {
                     "value": "booklore",
                     "label": "Booklore (API)",
@@ -639,14 +778,16 @@ def download_settings():
                 },
             ],
             default="folder",
+            user_overridable=True,
         ),
         TextField(
             key="DESTINATION",
             label="Destination",
-            description="Directory where downloaded files are saved.",
+            description="Directory where downloaded files are saved. Use {User} for per-user folders (e.g. /books/{User}).",
             default="/books",
             required=True,
             env_var="INGEST_DIR",  # Legacy env var name for backwards compatibility
+            user_overridable=True,
             show_when={
                 "field": "BOOKS_OUTPUT_MODE",
                 "value": "folder",
@@ -665,7 +806,7 @@ def download_settings():
                 {
                     "value": "rename",
                     "label": "Rename Only",
-                    "description": "Rename files using a template"
+                    "description": "Rename single-file downloads; multi-file keeps original names."
                 },
                 {
                     "value": "organize",
@@ -683,7 +824,7 @@ def download_settings():
         TextField(
             key="TEMPLATE_RENAME",
             label="Naming Template",
-            description="Variables: {Author}, {Title}, {Year}. Universal adds: {Series}, {SeriesPosition}, {Subtitle}. Rename templates are filename-only (no '/' or '\\'); use Organize for folders.",
+            description="Variables: {Author}, {Title}, {Year}, {User}, {OriginalName} (source filename without extension). Universal adds: {Series}, {SeriesPosition}, {Subtitle}. Use arbitrary prefix/suffix: {Vol. SeriesPosition - } outputs 'Vol. 2 - ' when set, nothing when empty. Rename templates are filename-only (no '/' or '\\'); use Organize for folders. Applies to single-file downloads.",
             default="{Author} - {Title} ({Year})",
             placeholder="{Author} - {Title} ({Year})",
             show_when=[
@@ -695,7 +836,7 @@ def download_settings():
         TextField(
             key="TEMPLATE_ORGANIZE",
             label="Path Template",
-            description="Use / to create folders. Variables: {Author}, {Title}, {Year}. Universal adds: {Series}, {SeriesPosition}, {Subtitle}",
+            description="Use / to create folders. Variables: {Author}, {Title}, {Year}, {User}, {OriginalName} (source filename without extension). Universal adds: {Series}, {SeriesPosition}, {Subtitle}. Use arbitrary prefix/suffix: {Vol. SeriesPosition - } outputs 'Vol. 2 - ' when set, nothing when empty.",
             default="{Author}/{Title} ({Year})",
             placeholder="{Author}/{Series/}{Title} ({Year})",
             show_when=[
@@ -742,13 +883,36 @@ def download_settings():
             required=True,
             show_when={"field": "BOOKS_OUTPUT_MODE", "value": "booklore"},
         ),
+        SelectField(
+            key="BOOKLORE_DESTINATION",
+            label="Upload Destination",
+            description="Choose whether uploads go directly to a specific library path or to Bookdrop for review.",
+            options=[
+                {
+                    "value": "library",
+                    "label": "Specific Library",
+                    "description": "Upload directly into the selected library path.",
+                },
+                {
+                    "value": "bookdrop",
+                    "label": "Bookdrop",
+                    "description": "Upload into Bookdrop and review metadata before importing to a library.",
+                },
+            ],
+            default="library",
+            show_when={"field": "BOOKS_OUTPUT_MODE", "value": "booklore"},
+        ),
         SelectField(
             key="BOOKLORE_LIBRARY_ID",
             label="Library",
             description="Booklore library to upload into.",
             options=get_booklore_library_options,
             required=True,
-            show_when={"field": "BOOKS_OUTPUT_MODE", "value": "booklore"},
+            user_overridable=True,
+            show_when=[
+                {"field": "BOOKS_OUTPUT_MODE", "value": "booklore"},
+                {"field": "BOOKLORE_DESTINATION", "value": "library"},
+            ],
         ),
         SelectField(
             key="BOOKLORE_PATH_ID",
@@ -757,7 +921,11 @@ def download_settings():
             options=get_booklore_path_options,
             required=True,
             filter_by_field="BOOKLORE_LIBRARY_ID",
-            show_when={"field": "BOOKS_OUTPUT_MODE", "value": "booklore"},
+            user_overridable=True,
+            show_when=[
+                {"field": "BOOKS_OUTPUT_MODE", "value": "booklore"},
+                {"field": "BOOKLORE_DESTINATION", "value": "library"},
+            ],
         ),
         ActionButton(
             key="test_booklore",
@@ -767,6 +935,110 @@ def download_settings():
             callback=test_booklore_connection,
             show_when={"field": "BOOKS_OUTPUT_MODE", "value": "booklore"},
         ),
+        HeadingField(
+            key="email_heading",
+            title="Email",
+            description="Send books as email attachments via SMTP. Audiobooks always use folder mode.",
+            show_when={"field": "BOOKS_OUTPUT_MODE", "value": "email"},
+        ),
+        TextField(
+            key="EMAIL_RECIPIENT",
+            label="Default Email Recipient",
+            description="Optional fallback email address when no per-user email recipient override is configured.",
+            placeholder="reader@example.com",
+            user_overridable=True,
+            show_when={"field": "BOOKS_OUTPUT_MODE", "value": "email"},
+        ),
+        NumberField(
+            key="EMAIL_ATTACHMENT_SIZE_LIMIT_MB",
+            label="Attachment Size Limit (MB)",
+            description="Maximum total attachment size per email. Email encoding adds overhead; keep this below your provider's limit.",
+            default=25,
+            min_value=1,
+            max_value=600,
+            show_when={"field": "BOOKS_OUTPUT_MODE", "value": "email"},
+        ),
+        TextField(
+            key="EMAIL_SMTP_HOST",
+            label="SMTP Host",
+            description="SMTP server hostname or IP (e.g., smtp.gmail.com).",
+            placeholder="smtp.example.com",
+            required=True,
+            show_when={"field": "BOOKS_OUTPUT_MODE", "value": "email"},
+        ),
+        NumberField(
+            key="EMAIL_SMTP_PORT",
+            label="SMTP Port",
+            description="SMTP server port (587 is typical for STARTTLS, 465 for SSL).",
+            default=587,
+            min_value=1,
+            max_value=65535,
+            show_when={"field": "BOOKS_OUTPUT_MODE", "value": "email"},
+        ),
+        SelectField(
+            key="EMAIL_SMTP_SECURITY",
+            label="SMTP Security",
+            description="Transport security mode for SMTP.",
+            options=[
+                {"value": "none", "label": "None", "description": "No TLS (not recommended)."},
+                {"value": "starttls", "label": "STARTTLS", "description": "Upgrade to TLS after connecting (recommended)."},
+                {"value": "ssl", "label": "SSL/TLS", "description": "Connect using TLS (SMTPS)."},
+            ],
+            default="starttls",
+            show_when={"field": "BOOKS_OUTPUT_MODE", "value": "email"},
+        ),
+        TextField(
+            key="EMAIL_SMTP_USERNAME",
+            label="Username",
+            description="SMTP username (leave empty for no authentication).",
+            placeholder="user@example.com",
+            show_when={"field": "BOOKS_OUTPUT_MODE", "value": "email"},
+        ),
+        PasswordField(
+            key="EMAIL_SMTP_PASSWORD",
+            label="Password",
+            description="SMTP password (required if Username is set).",
+            show_when={"field": "BOOKS_OUTPUT_MODE", "value": "email"},
+        ),
+        TextField(
+            key="EMAIL_FROM",
+            label="From Address",
+            description="From address used for the email. You can include a display name (e.g., Shelfmark <mail@example.com>). Leave blank to default to the SMTP username (when it is an email address).",
+            placeholder="Shelfmark <mail@example.com>",
+            show_when={"field": "BOOKS_OUTPUT_MODE", "value": "email"},
+        ),
+        TextField(
+            key="EMAIL_SUBJECT_TEMPLATE",
+            label="Subject Template",
+            description="Email subject. Variables: {Author}, {Title}, {Year}, {Series}, {SeriesPosition}, {Subtitle}, {Format}.",
+            default="{Title}",
+            placeholder="{Title}",
+            show_when={"field": "BOOKS_OUTPUT_MODE", "value": "email"},
+        ),
+        NumberField(
+            key="EMAIL_SMTP_TIMEOUT_SECONDS",
+            label="SMTP Timeout (seconds)",
+            description="How long to wait for SMTP operations before failing.",
+            default=60,
+            min_value=1,
+            max_value=600,
+            show_when={"field": "BOOKS_OUTPUT_MODE", "value": "email"},
+        ),
+        CheckboxField(
+            key="EMAIL_ALLOW_UNVERIFIED_TLS",
+            label="Allow Unverified TLS",
+            description="Disable TLS certificate verification (not recommended).",
+            default=False,
+            show_when={"field": "BOOKS_OUTPUT_MODE", "value": "email"},
+        ),
+        ActionButton(
+            key="test_email",
+            label="Test SMTP Connection",
+            description="Verify your SMTP configuration (connect + optional login).",
+            style="primary",
+            callback=test_email_connection,
+            show_when={"field": "BOOKS_OUTPUT_MODE", "value": "email"},
+        ),
 
         # === AUDIOBOOKS SECTION ===
         # Universal mode only
@@ -779,8 +1051,8 @@ def download_settings():
         TextField(
             key="DESTINATION_AUDIOBOOK",
             label="Destination",
-            description="Leave empty to use Books destination.",
-            placeholder="/audiobooks",
+            description="Directory where downloaded audiobook files are saved. Leave empty to use the Books destination.",
+            user_overridable=True,
             universal_only=True,
         ),
         SelectField(
@@ -789,7 +1061,7 @@ def download_settings():
             description="Choose how downloaded audiobook files are named and organized.",
             options=[
                 {"value": "none", "label": "None", "description": "Keep original filename from source"},
-                {"value": "rename", "label": "Rename Only", "description": "Rename files using a template"},
+                {"value": "rename", "label": "Rename Only", "description": "Rename single-file downloads; multi-file keeps original names."},
                 {"value": "organize", "label": "Rename and Organize", "description": "Create folders and rename files using a template. Recommended for Audiobookshelf. Do not use with ingest folders."},
             ],
             default="rename",
@@ -799,7 +1071,7 @@ def download_settings():
         TextField(
             key="TEMPLATE_AUDIOBOOK_RENAME",
             label="Naming Template",
-            description="Variables: {Author}, {Title}, {Year}, {Series}, {SeriesPosition}, {Subtitle}, {PartNumber}. Rename templates are filename-only (no '/' or '\\'); use Organize for folders.",
+            description="Variables: {Author}, {Title}, {Year}, {User}, {OriginalName} (source filename without extension), {Series}, {SeriesPosition}, {Subtitle}, {PartNumber}. Use arbitrary prefix/suffix: {Vol. SeriesPosition - } outputs 'Vol. 2 - ' when set, nothing when empty. Rename templates are filename-only (no '/' or '\\'); use Organize for folders. Applies to single-file downloads.",
             default="{Author} - {Title}",
             placeholder="{Author} - {Title}{ - Part }{PartNumber}",
             show_when={"field": "FILE_ORGANIZATION_AUDIOBOOK", "value": "rename"},
@@ -809,7 +1081,7 @@ def download_settings():
         TextField(
             key="TEMPLATE_AUDIOBOOK_ORGANIZE",
             label="Path Template",
-            description="Use / to create folders. Variables: {Author}, {Title}, {Year}, {Series}, {SeriesPosition}, {Subtitle}, {PartNumber}",
+            description="Use / to create folders. Variables: {Author}, {Title}, {Year}, {User}, {OriginalName} (source filename without extension), {Series}, {SeriesPosition}, {Subtitle}, {PartNumber}. Use arbitrary prefix/suffix: {Vol. SeriesPosition - } outputs 'Vol. 2 - ' when set, nothing when empty.",
             default="{Author}/{Title}",
             placeholder="{Author}/{Series/}{Title}{ - Part }{PartNumber}",
             show_when={"field": "FILE_ORGANIZATION_AUDIOBOOK", "value": "organize"},
@@ -1102,30 +1374,76 @@ def cloudflare_bypass_settings():
         ),
     ]
 
+def _on_save_mirrors(values: Dict[str, Any]) -> Dict[str, Any]:
+    """Normalize mirror list settings before persisting."""
+    from shelfmark.core.logger import setup_logger
+    from shelfmark.core.mirrors import DEFAULT_AA_MIRRORS
+    from shelfmark.core.utils import normalize_http_url
+
+    logger = setup_logger(__name__)
+
+    raw_urls = values.get("AA_MIRROR_URLS")
+    if raw_urls is None:
+        return {"error": False, "values": values}
+
+    if isinstance(raw_urls, str):
+        parts = [p.strip() for p in raw_urls.split(",") if p.strip()]
+    elif isinstance(raw_urls, list):
+        parts = [str(p).strip() for p in raw_urls if str(p).strip()]
+    else:
+        parts = []
+
+    normalized: list[str] = []
+    for url in parts:
+        if url.lower() == "auto":
+            continue
+        norm = normalize_http_url(url, default_scheme="https")
+        if norm and norm not in normalized:
+            normalized.append(norm)
+
+    if not normalized:
+        logger.warning("AA_MIRROR_URLS saved empty/invalid; falling back to defaults")
+        normalized = [normalize_http_url(url, default_scheme="https") for url in DEFAULT_AA_MIRRORS]
+        normalized = [url for url in normalized if url]
+
+    values["AA_MIRROR_URLS"] = normalized
+    return {"error": False, "values": values}
+
+# Register the on_save handler for this tab
+register_on_save("mirrors", _on_save_mirrors)
+
 
 @register_settings("mirrors", "Mirrors", icon="globe", order=23, group="direct_download")
 def mirror_settings():
     """Configure download source mirrors."""
-    from shelfmark.core.mirrors import DEFAULT_ZLIB_MIRRORS, DEFAULT_WELIB_MIRRORS
+    from shelfmark.core.mirrors import DEFAULT_AA_MIRRORS, DEFAULT_ZLIB_MIRRORS, DEFAULT_WELIB_MIRRORS
 
     return [
         # === PRIMARY SOURCE ===
         HeadingField(
             key="aa_mirrors_heading",
-            title="Primary Source",
-            description="Primary mirror with auto-probe on startup. Additional mirrors used as fallback.",
+            title="Anna's Archive",
+            description="Choose a primary mirror, or use Auto to try mirrors from your list below. The mirror list controls which options appear in the dropdown and the order used in Auto mode.",
         ),
         SelectField(
             key="AA_BASE_URL",
             label="Primary Mirror",
-            description="Select 'Auto' to probe mirrors on startup, or choose a specific mirror.",
+            description="Select 'Auto' to try mirrors from your list on startup and fall back on failures. Choosing a specific mirror locks Shelfmark to that mirror (no fallback).",
             options=_get_aa_base_url_options,
             default="auto",
         ),
+        TagListField(
+            key="AA_MIRROR_URLS",
+            label="Mirrors",
+            description="Editable list of AA mirrors. Used to populate the Primary Mirror dropdown and the order used when Auto is selected. Type a URL and press Enter to add. Order matters for auto-rotation",
+            placeholder="https://annas-archive.gl",
+            default=DEFAULT_AA_MIRRORS,
+        ),
         TextField(
             key="AA_ADDITIONAL_URLS",
-            label="Additional Mirrors",
-            description="Comma-separated list of custom mirror URLs.",
+            label="Additional Mirrors (Legacy)",
+            description="Deprecated. Use Mirrors instead. This is kept for backwards compatibility with existing installs and environment variables.",
+            show_when={"field": "AA_ADDITIONAL_URLS", "notEmpty": True},
         ),
 
         # === LIBGEN ===
@@ -1232,6 +1550,12 @@ def advanced_settings():
             ],
             default="absolute",
         ),
+        CheckboxField(
+            key="CUSTOM_SCRIPT_JSON_PAYLOAD",
+            label="Custom Script JSON Payload",
+            description="Send a JSON payload to the script via stdin. Useful for multi-file imports (audiobooks) or richer metadata without relying on path parsing.",
+            default=False,
+        ),
         HeadingField(
             key="remote_path_mappings_heading",
             title="Remote Path Mappings",

shelfmark/config/users_settings.py

@@ -0,0 +1,390 @@
+"""Users settings tab registration.
+
+This registers a 'users' tab in the settings sidebar.
+The actual user management is handled by a custom frontend component
+that talks to /api/admin/users endpoints.
+"""
+
+from typing import Any
+
+from shelfmark.core.settings_registry import (
+    CheckboxField,
+    CustomComponentField,
+    HeadingField,
+    MultiSelectField,
+    NumberField,
+    SelectField,
+    TableField,
+    register_on_save,
+    register_settings,
+)
+from shelfmark.core.request_policy import (
+    get_source_content_type_capabilities,
+    parse_policy_mode,
+    validate_policy_rules,
+)
+
+
+_REQUEST_DEFAULT_MODE_OPTIONS = [
+    {
+        "value": "download",
+        "label": "Download",
+        "description": "Everything can be downloaded directly.",
+    },
+    {
+        "value": "request_release",
+        "label": "Request Release",
+        "description": "Users must request a specific release.",
+    },
+    {
+        "value": "request_book",
+        "label": "Request Book",
+        "description": "Users request a book, admin picks the release.",
+    },
+    {
+        "value": "blocked",
+        "label": "Blocked",
+        "description": "No downloads or requests allowed.",
+    },
+]
+
+_REQUEST_MATRIX_MODE_OPTIONS = [
+    option for option in _REQUEST_DEFAULT_MODE_OPTIONS if option["value"] != "request_book"
+]
+
+_SELF_SETTINGS_SECTION_OPTIONS = [
+    {
+        "value": "delivery",
+        "label": "Delivery Preferences",
+        "description": "Show personal delivery output and destination settings.",
+    },
+    {
+        "value": "search",
+        "label": "Search Preferences",
+        "description": "Show personal search mode and provider settings.",
+    },
+    {
+        "value": "notifications",
+        "label": "Notifications",
+        "description": "Show personal notification route settings.",
+    },
+]
+_SELF_SETTINGS_SECTION_VALUES = {option["value"] for option in _SELF_SETTINGS_SECTION_OPTIONS}
+_SELF_SETTINGS_SECTION_DEFAULTS = [option["value"] for option in _SELF_SETTINGS_SECTION_OPTIONS]
+_SEARCH_MODE_VALUES = {"direct", "universal"}
+_SEARCH_PREFERENCE_PROVIDER_KEYS = {"METADATA_PROVIDER", "METADATA_PROVIDER_AUDIOBOOK"}
+_SEARCH_PREFERENCE_VALIDATABLE_KEYS = {
+    "SEARCH_MODE",
+    "DEFAULT_RELEASE_SOURCE",
+    *_SEARCH_PREFERENCE_PROVIDER_KEYS,
+}
+
+_USERS_HEADING_DESCRIPTION_BY_AUTH_MODE = {
+    "builtin": (
+        "Create and manage user accounts directly. Passwords are stored locally and users sign in "
+        "with their username and password."
+    ),
+    "oidc": (
+        "Users sign in through your identity provider. New accounts can be created automatically on "
+        "first login when auto-provisioning is enabled, or you can pre-create users here and they\u2019ll "
+        "be linked by email on first sign-in."
+    ),
+    "proxy": (
+        "Users are authenticated by your reverse proxy. Accounts are automatically created on first "
+        "sign-in. If a local user with a matching username already exists, it will be linked instead."
+    ),
+    "cwa": (
+        "User accounts are synced from your Calibre-Web database. Users are matched by email, and new "
+        "accounts are created here when new CWA users are found."
+    ),
+    "none": "Authentication is disabled. Anyone can access Shelfmark without signing in.",
+    "default": "Authentication is disabled. Anyone can access Shelfmark without signing in.",
+}
+
+
+def _get_request_source_options():
+    """Build request-policy source options from registered release sources."""
+    from shelfmark.release_sources import list_available_sources
+
+    options = []
+    for source in list_available_sources():
+        options.append(
+            {
+                "value": source["name"],
+                "label": source["display_name"],
+            }
+        )
+    return options
+
+
+def _get_request_policy_rule_columns():
+    source_capabilities = get_source_content_type_capabilities()
+    content_type_options = []
+
+    for source_name, supported_types in source_capabilities.items():
+        normalized_types = [t for t in ("ebook", "audiobook") if t in supported_types]
+        for content_type in normalized_types:
+            content_type_options.append(
+                {
+                    "value": content_type,
+                    "label": "Ebook" if content_type == "ebook" else "Audiobook",
+                    "childOf": source_name,
+                }
+            )
+
+    return [
+        {
+            "key": "source",
+            "label": "Source",
+            "type": "select",
+            "options": _get_request_source_options(),
+            "defaultValue": "",
+            "placeholder": "Select source...",
+        },
+        {
+            "key": "content_type",
+            "label": "Content Type",
+            "type": "select",
+            "options": content_type_options,
+            "defaultValue": "",
+            "placeholder": "Select content type...",
+            "filterByField": "source",
+        },
+        {
+            "key": "mode",
+            "label": "Mode",
+            "type": "select",
+            "options": _REQUEST_MATRIX_MODE_OPTIONS,
+            "defaultValue": "",
+            "placeholder": "Select mode...",
+        },
+    ]
+
+
+def validate_search_preference_value(key: str, value: Any) -> tuple[Any, str | None]:
+    """Validate and normalize a search preference value for user overrides."""
+    if key not in _SEARCH_PREFERENCE_VALIDATABLE_KEYS:
+        return value, None
+
+    if value is None:
+        return None, None
+
+    normalized_value = str(value).strip()
+
+    if key == "SEARCH_MODE":
+        normalized_mode = normalized_value.lower()
+        if normalized_mode not in _SEARCH_MODE_VALUES:
+            return value, "SEARCH_MODE must be 'direct' or 'universal'"
+        return normalized_mode, None
+
+    if key in _SEARCH_PREFERENCE_PROVIDER_KEYS:
+        if normalized_value == "":
+            return "", None
+        from shelfmark.metadata_providers import is_provider_registered
+
+        if not is_provider_registered(normalized_value):
+            return (
+                value,
+                f"{key} must be a valid metadata provider name or empty",
+            )
+        return normalized_value, None
+
+    if key == "DEFAULT_RELEASE_SOURCE":
+        if normalized_value == "":
+            return "", None
+        from shelfmark.release_sources import list_available_sources
+
+        valid_sources = {source["name"] for source in list_available_sources()}
+        if normalized_value not in valid_sources:
+            return (
+                value,
+                "DEFAULT_RELEASE_SOURCE must be a valid release source name or empty",
+            )
+        return normalized_value, None
+
+    return value, None
+
+
+def _on_save_users(values):
+    """Validate users/request-policy settings before persistence."""
+    if "VISIBLE_SELF_SETTINGS_SECTIONS" in values:
+        raw_sections = values["VISIBLE_SELF_SETTINGS_SECTIONS"]
+        if raw_sections is None:
+            candidate_sections: list[str] = []
+        elif isinstance(raw_sections, str):
+            candidate_sections = [s.strip() for s in raw_sections.split(",") if s.strip()]
+        elif isinstance(raw_sections, (list, tuple, set)):
+            candidate_sections = [str(section).strip() for section in raw_sections if str(section).strip()]
+        else:
+            return {
+                "error": True,
+                "message": "VISIBLE_SELF_SETTINGS_SECTIONS must be a list of section identifiers",
+                "values": values,
+            }
+
+        normalized_sections: list[str] = []
+        for section in candidate_sections:
+            if section not in _SELF_SETTINGS_SECTION_VALUES:
+                allowed = ", ".join(sorted(_SELF_SETTINGS_SECTION_VALUES))
+                return {
+                    "error": True,
+                    "message": (
+                        "VISIBLE_SELF_SETTINGS_SECTIONS contains an unsupported section "
+                        f"'{section}'. Supported values: {allowed}"
+                    ),
+                    "values": values,
+                }
+            if section not in normalized_sections:
+                normalized_sections.append(section)
+
+        values["VISIBLE_SELF_SETTINGS_SECTIONS"] = normalized_sections
+
+    if "REQUEST_POLICY_DEFAULT_EBOOK" in values:
+        if parse_policy_mode(values["REQUEST_POLICY_DEFAULT_EBOOK"]) is None:
+            return {
+                "error": True,
+                "message": "REQUEST_POLICY_DEFAULT_EBOOK must be a valid policy mode",
+                "values": values,
+            }
+
+    if "REQUEST_POLICY_DEFAULT_AUDIOBOOK" in values:
+        if parse_policy_mode(values["REQUEST_POLICY_DEFAULT_AUDIOBOOK"]) is None:
+            return {
+                "error": True,
+                "message": "REQUEST_POLICY_DEFAULT_AUDIOBOOK must be a valid policy mode",
+                "values": values,
+            }
+
+    if "REQUEST_POLICY_RULES" in values:
+        normalized_rules, errors = validate_policy_rules(values["REQUEST_POLICY_RULES"])
+        if errors:
+            return {
+                "error": True,
+                "message": "; ".join(errors),
+                "values": values,
+            }
+        values["REQUEST_POLICY_RULES"] = normalized_rules
+
+    for key in _SEARCH_PREFERENCE_VALIDATABLE_KEYS:
+        if key not in values:
+            continue
+        normalized_value, validation_error = validate_search_preference_value(key, values[key])
+        if validation_error:
+            return {
+                "error": True,
+                "message": validation_error,
+                "values": values,
+            }
+        values[key] = normalized_value
+
+    return {"error": False, "values": values}
+
+
+register_on_save("users", _on_save_users)
+
+
+@register_settings("users", "Users & Requests", icon="users", order=6)
+def users_settings():
+    """User management tab - rendered as a custom component on the frontend."""
+    return [
+        HeadingField(
+            key="users_heading",
+            title="Users",
+            description=_USERS_HEADING_DESCRIPTION_BY_AUTH_MODE["default"],
+            description_by_auth_mode=_USERS_HEADING_DESCRIPTION_BY_AUTH_MODE,
+        ),
+        CustomComponentField(
+            key="users_management",
+            component="users_management",
+        ),
+        MultiSelectField(
+            key="VISIBLE_SELF_SETTINGS_SECTIONS",
+            label="Visible Self-Settings Sections",
+            description=(
+                "Choose which personal settings sections are shown in My Account for non-admin users."
+            ),
+            options=_SELF_SETTINGS_SECTION_OPTIONS,
+            default=_SELF_SETTINGS_SECTION_DEFAULTS,
+            variant="dropdown",
+            env_supported=False,
+        ),
+        HeadingField(
+            key="requests_heading",
+            title="Requests",
+            description=(
+                "Choose what users can download directly and what needs approval first."
+            ),
+        ),
+        CheckboxField(
+            key="REQUESTS_ENABLED",
+            label="Enable Requests",
+            description=(
+                "Turn this off to let everyone download directly without needing approval."
+            ),
+            default=False,
+            user_overridable=True,
+        ),
+        CustomComponentField(
+            key="request_policy_editor",
+            component="request_policy_grid",
+            label="Request Rules",
+            description=(
+                "Fine-tune access per source. Source rules can only be the same or more restrictive than the default above."
+            ),
+            show_when={"field": "REQUESTS_ENABLED", "value": True},
+            wrap_in_field_wrapper=True,
+            value_fields=[
+                SelectField(
+                    key="REQUEST_POLICY_DEFAULT_EBOOK",
+                    label="Default Ebook Mode",
+                    description=(
+                        "Sets the baseline for all ebook sources."
+                    ),
+                    options=_REQUEST_DEFAULT_MODE_OPTIONS,
+                    default="download",
+                    user_overridable=True,
+                ),
+                SelectField(
+                    key="REQUEST_POLICY_DEFAULT_AUDIOBOOK",
+                    label="Default Audiobook Mode",
+                    description=(
+                        "Sets the baseline for all audiobook sources."
+                    ),
+                    options=_REQUEST_DEFAULT_MODE_OPTIONS,
+                    default="download",
+                    user_overridable=True,
+                ),
+                TableField(
+                    key="REQUEST_POLICY_RULES",
+                    label="Request Rules",
+                    description=(
+                        "Fine-tune access per source. Source rules can only be the same or more restrictive than the default above."
+                    ),
+                    columns=_get_request_policy_rule_columns,
+                    default=[],
+                    add_label="Add Rule",
+                    empty_message="No request policy rules configured.",
+                    env_supported=False,
+                    user_overridable=True,
+                ),
+            ],
+        ),
+        NumberField(
+            key="MAX_PENDING_REQUESTS_PER_USER",
+            label="Max pending requests per user",
+            description="How many open requests a user can have at a time.",
+            default=20,
+            min_value=1,
+            max_value=1000,
+            user_overridable=True,
+            show_when={"field": "REQUESTS_ENABLED", "value": True},
+        ),
+        CheckboxField(
+            key="REQUESTS_ALLOW_NOTES",
+            label="Allow notes on requests",
+            description="Let users add a note when they submit a request.",
+            default=True,
+            user_overridable=True,
+            show_when={"field": "REQUESTS_ENABLED", "value": True},
+        ),
+    ]

shelfmark/core/__init__.py

@@ -1,5 +1,5 @@
 """Core module - shared models, queue, and utilities."""
 
-from shelfmark.core.models import BookInfo, QueueItem, SearchFilters, QueueStatus
+from shelfmark.core.models import QueueItem, SearchFilters, QueueStatus
 from shelfmark.core.queue import BookQueue, book_queue
 from shelfmark.core.logger import setup_logger

shelfmark/core/activity_routes.py

@@ -0,0 +1,700 @@
+"""Activity API routes (snapshot, dismiss, history)."""
+
+from __future__ import annotations
+
+from typing import Any, Callable, NamedTuple
+
+from flask import Flask, jsonify, request, session
+
+from shelfmark.core.activity_view_state_service import (
+    ADMIN_VIEWER_SCOPE,
+    NOAUTH_VIEWER_SCOPE,
+    ActivityViewStateService,
+    user_viewer_scope,
+)
+from shelfmark.core.download_history_service import ACTIVE_DOWNLOAD_STATUS, DownloadHistoryService, VALID_TERMINAL_STATUSES
+from shelfmark.core.logger import setup_logger
+from shelfmark.core.models import ACTIVE_QUEUE_STATUSES, QueueStatus, TERMINAL_QUEUE_STATUSES
+from shelfmark.core.request_validation import RequestStatus
+from shelfmark.core.request_helpers import (
+    emit_ws_event,
+    extract_release_source_id,
+    normalize_positive_int,
+    populate_request_usernames,
+)
+from shelfmark.core.user_db import UserDB
+
+logger = setup_logger(__name__)
+
+
+def _require_authenticated(resolve_auth_mode: Callable[[], str]):
+    auth_mode = resolve_auth_mode()
+    if auth_mode == "none":
+        return None
+    if "user_id" not in session:
+        return jsonify({"error": "Unauthorized"}), 401
+    return None
+
+
+def _resolve_db_user_id(
+    require_in_auth_mode: bool = True,
+    *,
+    user_db: UserDB | None = None,
+):
+    raw_db_user_id = session.get("db_user_id")
+    if raw_db_user_id is None:
+        if not require_in_auth_mode:
+            return None, None
+        return None, (
+            jsonify(
+                {
+                    "error": "User identity unavailable for activity workflow",
+                    "code": "user_identity_unavailable",
+                }
+            ),
+            403,
+        )
+    try:
+        parsed_db_user_id = int(raw_db_user_id)
+    except (TypeError, ValueError):
+        if not require_in_auth_mode:
+            return None, None
+        return None, (
+            jsonify(
+                {
+                    "error": "User identity unavailable for activity workflow",
+                    "code": "user_identity_unavailable",
+                }
+            ),
+            403,
+        )
+
+    if parsed_db_user_id < 1:
+        if not require_in_auth_mode:
+            return None, None
+        return None, (
+            jsonify(
+                {
+                    "error": "User identity unavailable for activity workflow",
+                    "code": "user_identity_unavailable",
+                }
+            ),
+            403,
+        )
+
+    if user_db is not None:
+        try:
+            db_user = user_db.get_user(user_id=parsed_db_user_id)
+        except Exception as exc:
+            logger.warning("Failed to validate activity db identity %s: %s", parsed_db_user_id, exc)
+            db_user = None
+        if db_user is None:
+            if not require_in_auth_mode:
+                return None, None
+            return None, (
+                jsonify(
+                    {
+                        "error": "User identity unavailable for activity workflow",
+                        "code": "user_identity_unavailable",
+                    }
+                ),
+                403,
+            )
+
+    return parsed_db_user_id, None
+
+
+class _ActorContext(NamedTuple):
+    db_user_id: int | None
+    is_no_auth: bool
+    is_admin: bool
+    owner_scope: int | None
+    viewer_scope: str
+
+
+def _resolve_activity_actor(
+    *,
+    user_db: UserDB,
+    resolve_auth_mode: Callable[[], str],
+) -> tuple[_ActorContext | None, Any | None]:
+    """Resolve acting user identity for activity mutations.
+
+    Returns (actor, error_response). On success actor is non-None.
+    """
+    if resolve_auth_mode() == "none":
+        return _ActorContext(
+            db_user_id=None,
+            is_no_auth=True,
+            is_admin=True,
+            owner_scope=None,
+            viewer_scope=NOAUTH_VIEWER_SCOPE,
+        ), None
+
+    db_user_id, db_gate = _resolve_db_user_id(user_db=user_db)
+    if db_user_id is None:
+        return None, db_gate
+
+    is_admin = bool(session.get("is_admin"))
+    viewer_scope = ADMIN_VIEWER_SCOPE if is_admin else user_viewer_scope(db_user_id)
+    return _ActorContext(
+        db_user_id=db_user_id,
+        is_no_auth=False,
+        is_admin=is_admin,
+        owner_scope=None if is_admin else db_user_id,
+        viewer_scope=viewer_scope,
+    ), None
+
+
+def _activity_ws_room(actor: _ActorContext) -> str:
+    """Resolve the WebSocket room for activity events."""
+    if actor.is_no_auth or actor.is_admin:
+        return "admins"
+    if actor.db_user_id is not None:
+        return f"user_{actor.db_user_id}"
+    return "admins"
+
+
+def _check_item_ownership(actor: _ActorContext, row: dict[str, Any]) -> Any | None:
+    """Return a 403 response if the actor doesn't own the item, else None."""
+    if actor.is_admin:
+        return None
+    owner_user_id = normalize_positive_int(row.get("user_id"))
+    if owner_user_id != actor.db_user_id:
+        return jsonify({"error": "Forbidden"}), 403
+    return None
+
+
+def _check_terminal_download(row: dict[str, Any]) -> Any | None:
+    final_status = str(row.get("final_status") or "").strip().lower()
+    if final_status not in VALID_TERMINAL_STATUSES:
+        return jsonify({"error": "Only terminal downloads can be dismissed"}), 409
+    return None
+
+
+def _check_terminal_request(row: dict[str, Any]) -> Any | None:
+    if _request_terminal_status(row) is None:
+        return jsonify({"error": "Only terminal requests can be dismissed"}), 409
+    return None
+
+
+def _list_visible_requests(user_db: UserDB, *, is_admin: bool, db_user_id: int | None) -> list[dict[str, Any]]:
+    if is_admin:
+        request_rows = user_db.list_requests()
+        populate_request_usernames(request_rows, user_db)
+        return request_rows
+
+    if db_user_id is None:
+        return []
+    return user_db.list_requests(user_id=db_user_id)
+
+
+def _parse_item_key(item_key: Any, prefix: str) -> str | None:
+    """Extract the value after 'prefix:' from an item_key string."""
+    if not isinstance(item_key, str) or not item_key.startswith(f"{prefix}:"):
+        return None
+    value = item_key.split(":", 1)[1].strip()
+    return value or None
+
+
+_ALL_BUCKET_KEYS = (*ACTIVE_QUEUE_STATUSES, *TERMINAL_QUEUE_STATUSES)
+
+
+def _build_download_status_from_db(
+    *,
+    db_rows: list[dict[str, Any]],
+    queue_status: dict[str, dict[str, Any]],
+) -> dict[str, dict[str, Any]]:
+    """Build the download status dict from DB rows, overlaying live queue data.
+
+    Active DB rows are matched against the queue for live progress.
+    Terminal DB rows go directly into their final bucket.
+    Stale active rows (no queue entry) are treated as interrupted errors.
+    """
+    status: dict[str, dict[str, Any]] = {key: {} for key in _ALL_BUCKET_KEYS}
+
+    # Index queue items by task_id for fast lookup: task_id -> (bucket_key, payload)
+    queue_index: dict[str, tuple[str, dict[str, Any]]] = {}
+    for bucket_key in _ALL_BUCKET_KEYS:
+        bucket = queue_status.get(bucket_key)
+        if not isinstance(bucket, dict):
+            continue
+        for task_id, payload in bucket.items():
+            queue_index[str(task_id)] = (bucket_key, payload)
+
+    for row in db_rows:
+        task_id = str(row.get("task_id") or "").strip()
+        if not task_id:
+            continue
+
+        final_status = row.get("final_status")
+
+        if final_status == ACTIVE_DOWNLOAD_STATUS:
+            queue_entry = queue_index.pop(task_id, None)
+            if queue_entry is not None:
+                bucket_key, queue_payload = queue_entry
+                status[bucket_key][task_id] = queue_payload
+            else:
+                # Stale active row — no queue entry means it was interrupted
+                download_payload = DownloadHistoryService.to_download_payload(row)
+                download_payload["status_message"] = "Interrupted"
+                status[QueueStatus.ERROR][task_id] = download_payload
+        elif final_status in VALID_TERMINAL_STATUSES:
+            download_payload = DownloadHistoryService.to_download_payload(row)
+            # For complete/cancelled the saved status_message is a stale
+            # progress string (e.g. "Fetching download sources") — clear it
+            # so the frontend only shows its own status label.  Error rows
+            # keep theirs since the message describes the failure.
+            if final_status in ("complete", "cancelled"):
+                download_payload["status_message"] = None
+            status[final_status][task_id] = download_payload
+
+    return status
+
+
+def _request_terminal_status(row: dict[str, Any]) -> str | None:
+    request_status = row.get("status")
+    if request_status == RequestStatus.PENDING:
+        return None
+    if request_status == RequestStatus.REJECTED:
+        return RequestStatus.REJECTED
+    if request_status == RequestStatus.CANCELLED:
+        return RequestStatus.CANCELLED
+    if request_status != RequestStatus.FULFILLED:
+        return None
+
+    delivery_state = str(row.get("delivery_state") or "").strip().lower()
+    if delivery_state in {QueueStatus.ERROR, QueueStatus.CANCELLED}:
+        return delivery_state
+    return QueueStatus.COMPLETE
+
+
+def _minimal_request_snapshot(request_row: dict[str, Any], request_id: int) -> dict[str, Any]:
+    book_data = request_row.get("book_data")
+    release_data = request_row.get("release_data")
+    if not isinstance(book_data, dict):
+        book_data = {}
+    if not isinstance(release_data, dict):
+        release_data = {}
+
+    minimal_request = {
+        "id": request_id,
+        "user_id": request_row.get("user_id"),
+        "status": request_row.get("status"),
+        "request_level": request_row.get("request_level"),
+        "delivery_state": request_row.get("delivery_state"),
+        "book_data": book_data,
+        "release_data": release_data,
+        "note": request_row.get("note"),
+        "admin_note": request_row.get("admin_note"),
+        "created_at": request_row.get("created_at"),
+        "updated_at": request_row.get("reviewed_at") or request_row.get("created_at"),
+    }
+    username = request_row.get("username")
+    if isinstance(username, str):
+        minimal_request["username"] = username
+    return {"kind": "request", "request": minimal_request}
+
+
+def _request_history_entry(
+    request_row: dict[str, Any],
+    *,
+    dismissed_at: str | None,
+) -> dict[str, Any] | None:
+    request_id = normalize_positive_int(request_row.get("id"))
+    if request_id is None:
+        return None
+    final_status = _request_terminal_status(request_row)
+    item_key = f"request:{request_id}"
+    return {
+        "id": item_key,
+        "user_id": request_row.get("user_id"),
+        "item_type": "request",
+        "item_key": item_key,
+        "dismissed_at": dismissed_at,
+        "snapshot": _minimal_request_snapshot(request_row, request_id),
+        "origin": "request",
+        "final_status": final_status,
+        "terminal_at": request_row.get("reviewed_at") or request_row.get("created_at"),
+        "request_id": request_id,
+        "source_id": extract_release_source_id(request_row.get("release_data")),
+    }
+
+
+def register_activity_routes(
+    app: Flask,
+    user_db: UserDB,
+    *,
+    activity_view_state_service: ActivityViewStateService,
+    download_history_service: DownloadHistoryService,
+    resolve_auth_mode: Callable[[], str],
+    queue_status: Callable[..., dict[str, dict[str, Any]]],
+    sync_request_delivery_states: Callable[..., list[dict[str, Any]]],
+    emit_request_updates: Callable[[list[dict[str, Any]]], None],
+    ws_manager: Any | None = None,
+) -> None:
+    """Register activity routes."""
+
+    @app.route("/api/activity/snapshot", methods=["GET"])
+    def api_activity_snapshot():
+        auth_gate = _require_authenticated(resolve_auth_mode)
+        if auth_gate is not None:
+            return auth_gate
+
+        actor, actor_error = _resolve_activity_actor(
+            user_db=user_db,
+            resolve_auth_mode=resolve_auth_mode,
+        )
+        if actor_error is not None:
+            return actor_error
+
+        hidden_rows = activity_view_state_service.list_hidden(viewer_scope=actor.viewer_scope)
+        hidden_item_keys = {str(row.get("item_key") or "").strip() for row in hidden_rows}
+        dismissed_entries = [
+            {
+                "item_type": str(row.get("item_type") or "").strip().lower(),
+                "item_key": str(row.get("item_key") or "").strip(),
+            }
+            for row in hidden_rows
+            if str(row.get("item_type") or "").strip().lower() in {"download", "request"}
+            and str(row.get("item_key") or "").strip()
+        ]
+        live_queue = queue_status(user_id=actor.owner_scope)
+        db_rows = download_history_service.list_recent(
+            user_id=actor.owner_scope,
+            limit=200,
+        )
+        visible_db_rows = [
+            row
+            for row in db_rows
+            if f"download:{str(row.get('task_id') or '').strip()}" not in hidden_item_keys
+        ]
+
+        status = _build_download_status_from_db(
+            db_rows=visible_db_rows,
+            queue_status=live_queue,
+        )
+
+        updated_requests = sync_request_delivery_states(
+            user_db,
+            queue_status=status,
+            user_id=actor.owner_scope,
+        )
+        emit_request_updates(updated_requests)
+        request_rows = _list_visible_requests(
+            user_db,
+            is_admin=actor.is_admin,
+            db_user_id=actor.db_user_id,
+        )
+        visible_request_rows: list[dict[str, Any]] = []
+        for row in request_rows:
+            request_id = normalize_positive_int(row.get("id"))
+            if request_id is None:
+                continue
+            if f"request:{request_id}" in hidden_item_keys:
+                continue
+            visible_request_rows.append(row)
+
+        return jsonify(
+            {
+                "status": status,
+                "requests": visible_request_rows,
+                "dismissed": dismissed_entries,
+            }
+        )
+
+    @app.route("/api/activity/dismiss", methods=["POST"])
+    def api_activity_dismiss():
+        auth_gate = _require_authenticated(resolve_auth_mode)
+        if auth_gate is not None:
+            return auth_gate
+
+        actor, actor_error = _resolve_activity_actor(
+            user_db=user_db,
+            resolve_auth_mode=resolve_auth_mode,
+        )
+        if actor_error is not None:
+            return actor_error
+
+        data = request.get_json(silent=True)
+        if not isinstance(data, dict):
+            return jsonify({"error": "Invalid payload"}), 400
+
+        item_type = str(data.get("item_type") or "").strip().lower()
+        item_key = data.get("item_key")
+
+        dismissal_item: dict[str, str] | None = None
+
+        if item_type == "download":
+            task_id = _parse_item_key(item_key, "download")
+            if task_id is None:
+                return jsonify({"error": "item_key must be in the format download:<task_id>"}), 400
+
+            existing = download_history_service.get_by_task_id(task_id)
+            if existing is None:
+                return jsonify({"error": "Download not found"}), 404
+
+            ownership_gate = _check_item_ownership(actor, existing)
+            if ownership_gate is not None:
+                return ownership_gate
+            terminal_gate = _check_terminal_download(existing)
+            if terminal_gate is not None:
+                return terminal_gate
+
+            activity_view_state_service.dismiss(
+                viewer_scope=actor.viewer_scope,
+                item_type="download",
+                item_key=f"download:{task_id}",
+            )
+            dismissal_item = {"item_type": "download", "item_key": f"download:{task_id}"}
+
+        elif item_type == "request":
+            request_id = normalize_positive_int(_parse_item_key(item_key, "request"))
+            if request_id is None:
+                return jsonify({"error": "item_key must be in the format request:<id>"}), 400
+
+            request_row = user_db.get_request(request_id)
+            if request_row is None:
+                return jsonify({"error": "Request not found"}), 404
+
+            ownership_gate = _check_item_ownership(actor, request_row)
+            if ownership_gate is not None:
+                return ownership_gate
+            terminal_gate = _check_terminal_request(request_row)
+            if terminal_gate is not None:
+                return terminal_gate
+
+            activity_view_state_service.dismiss(
+                viewer_scope=actor.viewer_scope,
+                item_type="request",
+                item_key=f"request:{request_id}",
+            )
+            dismissal_item = {"item_type": "request", "item_key": f"request:{request_id}"}
+        else:
+            return jsonify({"error": "item_type must be one of: download, request"}), 400
+
+        room = _activity_ws_room(actor)
+        emit_ws_event(
+            ws_manager,
+            event_name="activity_update",
+            room=room,
+            payload={
+                "kind": "dismiss",
+                "item_type": dismissal_item["item_type"],
+                "item_key": dismissal_item["item_key"],
+            },
+        )
+
+        return jsonify({"status": "dismissed", "item": dismissal_item})
+
+    @app.route("/api/activity/dismiss-many", methods=["POST"])
+    def api_activity_dismiss_many():
+        auth_gate = _require_authenticated(resolve_auth_mode)
+        if auth_gate is not None:
+            return auth_gate
+
+        actor, actor_error = _resolve_activity_actor(
+            user_db=user_db,
+            resolve_auth_mode=resolve_auth_mode,
+        )
+        if actor_error is not None:
+            return actor_error
+
+        data = request.get_json(silent=True)
+        if not isinstance(data, dict):
+            return jsonify({"error": "Invalid payload"}), 400
+        items = data.get("items")
+        if not isinstance(items, list):
+            return jsonify({"error": "items must be an array"}), 400
+
+        dismissal_items: list[dict[str, str]] = []
+        missing_item_keys: list[str] = []
+
+        for item in items:
+            if not isinstance(item, dict):
+                return jsonify({"error": "items must contain objects"}), 400
+
+            item_type = str(item.get("item_type") or "").strip().lower()
+            item_key = item.get("item_key")
+
+            if item_type == "download":
+                task_id = _parse_item_key(item_key, "download")
+                if task_id is None:
+                    return jsonify({"error": "download item_key must be in the format download:<task_id>"}), 400
+                existing = download_history_service.get_by_task_id(task_id)
+                if existing is None:
+                    missing_item_keys.append(f"download:{task_id}")
+                    continue
+                ownership_gate = _check_item_ownership(actor, existing)
+                if ownership_gate is not None:
+                    return ownership_gate
+                terminal_gate = _check_terminal_download(existing)
+                if terminal_gate is not None:
+                    return terminal_gate
+                dismissal_items.append({"item_type": "download", "item_key": f"download:{task_id}"})
+                continue
+
+            if item_type == "request":
+                request_id = normalize_positive_int(_parse_item_key(item_key, "request"))
+                if request_id is None:
+                    return jsonify({"error": "request item_key must be in the format request:<id>"}), 400
+                request_row = user_db.get_request(request_id)
+                if request_row is None:
+                    missing_item_keys.append(f"request:{request_id}")
+                    continue
+                ownership_gate = _check_item_ownership(actor, request_row)
+                if ownership_gate is not None:
+                    return ownership_gate
+                terminal_gate = _check_terminal_request(request_row)
+                if terminal_gate is not None:
+                    return terminal_gate
+                dismissal_items.append({"item_type": "request", "item_key": f"request:{request_id}"})
+                continue
+
+            return jsonify({"error": "item_type must be one of: download, request"}), 400
+
+        if missing_item_keys:
+            return (
+                jsonify(
+                    {
+                        "error": "One or more activity items were not found",
+                        "missing_item_keys": missing_item_keys,
+                    }
+                ),
+                404,
+            )
+
+        dismissed_count = activity_view_state_service.dismiss_many(
+            viewer_scope=actor.viewer_scope,
+            items=dismissal_items,
+        )
+
+        room = _activity_ws_room(actor)
+        emit_ws_event(
+            ws_manager,
+            event_name="activity_update",
+            room=room,
+            payload={
+                "kind": "dismiss_many",
+                "count": dismissed_count,
+            },
+        )
+
+        return jsonify({"status": "dismissed", "count": dismissed_count})
+
+    @app.route("/api/activity/history", methods=["GET"])
+    def api_activity_history():
+        auth_gate = _require_authenticated(resolve_auth_mode)
+        if auth_gate is not None:
+            return auth_gate
+
+        actor, actor_error = _resolve_activity_actor(
+            user_db=user_db,
+            resolve_auth_mode=resolve_auth_mode,
+        )
+        if actor_error is not None:
+            return actor_error
+
+        limit = request.args.get("limit", type=int, default=50)
+        offset = request.args.get("offset", type=int, default=0)
+        if limit is None:
+            limit = 50
+        if offset is None:
+            offset = 0
+        if limit < 1:
+            return jsonify({"error": "limit must be a positive integer"}), 400
+        if offset < 0:
+            return jsonify({"error": "offset must be a non-negative integer"}), 400
+
+        history_rows = activity_view_state_service.list_history(
+            viewer_scope=actor.viewer_scope,
+            limit=limit,
+            offset=offset,
+        )
+        payload: list[dict[str, Any]] = []
+
+        for history_row in history_rows:
+            item_type = str(history_row.get("item_type") or "").strip().lower()
+            item_key = str(history_row.get("item_key") or "").strip()
+            dismissed_at = history_row.get("dismissed_at")
+
+            if not isinstance(dismissed_at, str) or not dismissed_at.strip():
+                raise RuntimeError(f"Activity history state missing dismissed_at for {item_key}")
+
+            if item_type == "download":
+                task_id = _parse_item_key(item_key, "download")
+                if task_id is None:
+                    raise RuntimeError(f"Invalid activity history item_key: {item_key}")
+
+                download_row = download_history_service.get_by_task_id(task_id)
+                if download_row is None:
+                    raise RuntimeError(f"Download history row not found for {item_key}")
+
+                if not actor.is_admin:
+                    owner_user_id = normalize_positive_int(download_row.get("user_id"))
+                    if owner_user_id != actor.db_user_id:
+                        raise RuntimeError(f"Viewer state out of scope for {item_key}")
+
+                payload.append(
+                    DownloadHistoryService.to_history_row(
+                        download_row,
+                        dismissed_at=dismissed_at,
+                    )
+                )
+                continue
+
+            if item_type == "request":
+                request_id = normalize_positive_int(_parse_item_key(item_key, "request"))
+                if request_id is None:
+                    raise RuntimeError(f"Invalid activity history item_key: {item_key}")
+
+                request_row = user_db.get_request(request_id)
+                if request_row is None:
+                    raise RuntimeError(f"Request row not found for {item_key}")
+
+                if not actor.is_admin:
+                    owner_user_id = normalize_positive_int(request_row.get("user_id"))
+                    if owner_user_id != actor.db_user_id:
+                        raise RuntimeError(f"Viewer state out of scope for {item_key}")
+
+                populate_request_usernames([request_row], user_db)
+                entry = _request_history_entry(
+                    request_row,
+                    dismissed_at=dismissed_at,
+                )
+                if entry is None:
+                    raise RuntimeError(f"Failed to build request history entry for {item_key}")
+                payload.append(entry)
+                continue
+
+            raise RuntimeError(f"Unknown activity history item_type: {item_type}")
+
+        return jsonify(payload)
+
+    @app.route("/api/activity/history", methods=["DELETE"])
+    def api_activity_history_clear():
+        auth_gate = _require_authenticated(resolve_auth_mode)
+        if auth_gate is not None:
+            return auth_gate
+
+        actor, actor_error = _resolve_activity_actor(
+            user_db=user_db,
+            resolve_auth_mode=resolve_auth_mode,
+        )
+        if actor_error is not None:
+            return actor_error
+
+        cleared_count = activity_view_state_service.clear_history(
+            viewer_scope=actor.viewer_scope,
+        )
+
+        room = _activity_ws_room(actor)
+        emit_ws_event(
+            ws_manager,
+            event_name="activity_update",
+            room=room,
+            payload={
+                "kind": "history_cleared",
+                "count": cleared_count,
+            },
+        )
+        return jsonify({"status": "cleared", "cleared_count": cleared_count})

shelfmark/core/activity_view_state_service.py

@@ -0,0 +1,310 @@
+"""Persistence helpers for per-viewer activity visibility state."""
+
+from __future__ import annotations
+
+import sqlite3
+import threading
+from typing import Any
+
+from shelfmark.core.request_helpers import now_utc_iso
+
+
+VALID_ACTIVITY_ITEM_TYPES = frozenset({"download", "request"})
+ADMIN_VIEWER_SCOPE = "admin:shared"
+NOAUTH_VIEWER_SCOPE = "noauth:shared"
+USER_VIEWER_SCOPE_PREFIX = "user:"
+
+
+def user_viewer_scope(user_id: int) -> str:
+    if not isinstance(user_id, int) or user_id < 1:
+        raise ValueError("user_id must be a positive integer")
+    return f"{USER_VIEWER_SCOPE_PREFIX}{user_id}"
+
+
+def normalize_viewer_scope(viewer_scope: Any) -> str:
+    if not isinstance(viewer_scope, str) or not viewer_scope.strip():
+        raise ValueError("viewer_scope must be a non-empty string")
+
+    normalized = viewer_scope.strip()
+    if normalized in {ADMIN_VIEWER_SCOPE, NOAUTH_VIEWER_SCOPE}:
+        return normalized
+
+    if not normalized.startswith(USER_VIEWER_SCOPE_PREFIX):
+        raise ValueError(
+            "viewer_scope must be one of: admin:shared, noauth:shared, or user:<id>"
+        )
+
+    raw_user_id = normalized[len(USER_VIEWER_SCOPE_PREFIX):].strip()
+    try:
+        parsed_user_id = int(raw_user_id)
+    except (TypeError, ValueError) as exc:
+        raise ValueError("viewer_scope user id must be a positive integer") from exc
+
+    return user_viewer_scope(parsed_user_id)
+
+
+def _normalize_item_type(item_type: Any) -> str:
+    if not isinstance(item_type, str) or not item_type.strip():
+        raise ValueError("item_type must be a non-empty string")
+    normalized = item_type.strip().lower()
+    if normalized not in VALID_ACTIVITY_ITEM_TYPES:
+        raise ValueError("item_type must be one of: download, request")
+    return normalized
+
+
+def _normalize_item_key(item_key: Any, *, item_type: str) -> str:
+    if not isinstance(item_key, str) or not item_key.strip():
+        raise ValueError("item_key must be a non-empty string")
+
+    normalized = item_key.strip()
+    expected_prefix = f"{item_type}:"
+    if not normalized.startswith(expected_prefix):
+        raise ValueError(f"item_key must be in the format {expected_prefix}<id>")
+    if not normalized.split(":", 1)[1].strip():
+        raise ValueError(f"item_key must be in the format {expected_prefix}<id>")
+    return normalized
+
+
+class ActivityViewStateService:
+    """Service for per-viewer activity dismissal and history visibility."""
+
+    def __init__(self, db_path: str):
+        self._db_path = db_path
+        self._lock = threading.Lock()
+
+    def _connect(self) -> sqlite3.Connection:
+        conn = sqlite3.connect(self._db_path)
+        conn.row_factory = sqlite3.Row
+        conn.execute("PRAGMA foreign_keys = ON")
+        return conn
+
+    def list_hidden(
+        self,
+        *,
+        viewer_scope: str,
+        limit: int | None = None,
+    ) -> list[dict[str, Any]]:
+        normalized_scope = normalize_viewer_scope(viewer_scope)
+        normalized_limit = None if limit is None else max(1, int(limit))
+        query = """
+            SELECT item_type, item_key, dismissed_at, cleared_at
+            FROM activity_view_state
+            WHERE viewer_scope = ?
+              AND dismissed_at IS NOT NULL
+            ORDER BY COALESCE(cleared_at, dismissed_at) DESC, id DESC
+        """
+        params: list[Any] = [normalized_scope]
+        if normalized_limit is not None:
+            query += "\nLIMIT ?"
+            params.append(normalized_limit)
+
+        conn = self._connect()
+        try:
+            rows = conn.execute(query, params).fetchall()
+            return [dict(row) for row in rows]
+        finally:
+            conn.close()
+
+    def list_history(
+        self,
+        *,
+        viewer_scope: str,
+        limit: int = 50,
+        offset: int = 0,
+    ) -> list[dict[str, Any]]:
+        normalized_scope = normalize_viewer_scope(viewer_scope)
+        normalized_limit = max(1, min(int(limit), 5000))
+        normalized_offset = max(0, int(offset))
+
+        conn = self._connect()
+        try:
+            rows = conn.execute(
+                """
+                SELECT item_type, item_key, dismissed_at
+                FROM activity_view_state
+                WHERE viewer_scope = ?
+                  AND dismissed_at IS NOT NULL
+                  AND cleared_at IS NULL
+                ORDER BY dismissed_at DESC, id DESC
+                LIMIT ? OFFSET ?
+                """,
+                (normalized_scope, normalized_limit, normalized_offset),
+            ).fetchall()
+            return [dict(row) for row in rows]
+        finally:
+            conn.close()
+
+    def dismiss(
+        self,
+        *,
+        viewer_scope: str,
+        item_type: str,
+        item_key: str,
+    ) -> int:
+        normalized_scope = normalize_viewer_scope(viewer_scope)
+        normalized_type = _normalize_item_type(item_type)
+        normalized_key = _normalize_item_key(item_key, item_type=normalized_type)
+        dismissed_at = now_utc_iso()
+
+        with self._lock:
+            conn = self._connect()
+            try:
+                cursor = conn.execute(
+                    """
+                    INSERT INTO activity_view_state (
+                        viewer_scope,
+                        item_type,
+                        item_key,
+                        dismissed_at,
+                        cleared_at
+                    )
+                    VALUES (?, ?, ?, ?, NULL)
+                    ON CONFLICT(viewer_scope, item_type, item_key) DO UPDATE SET
+                        dismissed_at = excluded.dismissed_at,
+                        cleared_at = NULL
+                    """,
+                    (normalized_scope, normalized_type, normalized_key, dismissed_at),
+                )
+                conn.commit()
+                rowcount = int(cursor.rowcount) if cursor.rowcount is not None else 0
+                return max(rowcount, 0)
+            finally:
+                conn.close()
+
+    def dismiss_many(
+        self,
+        *,
+        viewer_scope: str,
+        items: list[dict[str, str]],
+    ) -> int:
+        normalized_scope = normalize_viewer_scope(viewer_scope)
+        if not items:
+            return 0
+
+        seen: set[tuple[str, str]] = set()
+        normalized_items: list[tuple[str, str]] = []
+        for item in items:
+            normalized_type = _normalize_item_type(item.get("item_type"))
+            normalized_key = _normalize_item_key(item.get("item_key"), item_type=normalized_type)
+            marker = (normalized_type, normalized_key)
+            if marker in seen:
+                continue
+            seen.add(marker)
+            normalized_items.append(marker)
+
+        if not normalized_items:
+            return 0
+
+        dismissed_at = now_utc_iso()
+        with self._lock:
+            conn = self._connect()
+            try:
+                total = 0
+                for normalized_type, normalized_key in normalized_items:
+                    cursor = conn.execute(
+                        """
+                        INSERT INTO activity_view_state (
+                            viewer_scope,
+                            item_type,
+                            item_key,
+                            dismissed_at,
+                            cleared_at
+                        )
+                        VALUES (?, ?, ?, ?, NULL)
+                        ON CONFLICT(viewer_scope, item_type, item_key) DO UPDATE SET
+                            dismissed_at = excluded.dismissed_at,
+                            cleared_at = NULL
+                        """,
+                        (normalized_scope, normalized_type, normalized_key, dismissed_at),
+                    )
+                    rowcount = int(cursor.rowcount) if cursor.rowcount is not None else 0
+                    total += max(rowcount, 0)
+                conn.commit()
+                return total
+            finally:
+                conn.close()
+
+    def clear_history(self, *, viewer_scope: str) -> int:
+        normalized_scope = normalize_viewer_scope(viewer_scope)
+        cleared_at = now_utc_iso()
+
+        with self._lock:
+            conn = self._connect()
+            try:
+                cursor = conn.execute(
+                    """
+                    UPDATE activity_view_state
+                    SET cleared_at = ?
+                    WHERE viewer_scope = ?
+                      AND dismissed_at IS NOT NULL
+                      AND cleared_at IS NULL
+                    """,
+                    (cleared_at, normalized_scope),
+                )
+                conn.commit()
+                rowcount = int(cursor.rowcount) if cursor.rowcount is not None else 0
+                return max(rowcount, 0)
+            finally:
+                conn.close()
+
+    def clear_item_for_all_viewers(self, *, item_type: str, item_key: str) -> int:
+        normalized_type = _normalize_item_type(item_type)
+        normalized_key = _normalize_item_key(item_key, item_type=normalized_type)
+
+        with self._lock:
+            conn = self._connect()
+            try:
+                cursor = conn.execute(
+                    """
+                    DELETE FROM activity_view_state
+                    WHERE item_type = ? AND item_key = ?
+                    """,
+                    (normalized_type, normalized_key),
+                )
+                conn.commit()
+                rowcount = int(cursor.rowcount) if cursor.rowcount is not None else 0
+                return max(rowcount, 0)
+            finally:
+                conn.close()
+
+    def delete_viewer_scope(self, *, viewer_scope: str) -> int:
+        normalized_scope = normalize_viewer_scope(viewer_scope)
+
+        with self._lock:
+            conn = self._connect()
+            try:
+                cursor = conn.execute(
+                    "DELETE FROM activity_view_state WHERE viewer_scope = ?",
+                    (normalized_scope,),
+                )
+                conn.commit()
+                rowcount = int(cursor.rowcount) if cursor.rowcount is not None else 0
+                return max(rowcount, 0)
+            finally:
+                conn.close()
+
+    def delete_items(self, *, item_type: str, item_keys: list[str]) -> int:
+        normalized_type = _normalize_item_type(item_type)
+        normalized_keys = [
+            _normalize_item_key(item_key, item_type=normalized_type)
+            for item_key in item_keys
+        ]
+        if not normalized_keys:
+            return 0
+
+        placeholders = ",".join("?" for _ in normalized_keys)
+        with self._lock:
+            conn = self._connect()
+            try:
+                cursor = conn.execute(
+                    f"""
+                    DELETE FROM activity_view_state
+                    WHERE item_type = ? AND item_key IN ({placeholders})
+                    """,
+                    (normalized_type, *normalized_keys),
+                )
+                conn.commit()
+                rowcount = int(cursor.rowcount) if cursor.rowcount is not None else 0
+                return max(rowcount, 0)
+            finally:
+                conn.close()

shelfmark/core/admin_routes.py

@@ -0,0 +1,420 @@
+"""Admin user management API routes.
+
+Registers /api/admin/users CRUD endpoints for managing users.
+All endpoints require admin session.
+"""
+
+from functools import wraps
+import os
+import sqlite3
+from typing import Any
+
+from flask import Flask, g, jsonify, request, session
+from werkzeug.security import generate_password_hash
+
+from shelfmark.config.booklore_settings import (
+    get_booklore_library_options,
+    get_booklore_path_options,
+)
+from shelfmark.config.env import CWA_DB_PATH
+from shelfmark.core.admin_settings_routes import (
+    register_admin_settings_routes,
+    validate_user_settings,
+)
+from shelfmark.core.auth_modes import (
+    AUTH_SOURCE_BUILTIN,
+    AUTH_SOURCE_CWA,
+    AUTH_SOURCE_OIDC,
+    AUTH_SOURCE_PROXY,
+    is_user_active_for_auth_mode,
+    load_active_auth_mode,
+    normalize_auth_source,
+)
+from shelfmark.core.cwa_user_sync import sync_cwa_users_from_rows
+from shelfmark.core.logger import setup_logger
+from shelfmark.core.settings_registry import load_config_file
+from shelfmark.core.user_db import UserDB
+
+logger = setup_logger(__name__)
+
+
+def _get_user_edit_capabilities(
+    user: dict[str, Any],
+    security_config: dict[str, Any] | None = None,
+) -> dict[str, Any]:
+    """Return backend-authored capability flags for the user edit form."""
+    auth_source = normalize_auth_source(
+        user.get("auth_source"),
+        user.get("oidc_subject"),
+    )
+    if security_config is None and auth_source == AUTH_SOURCE_OIDC:
+        security_config = load_config_file("security")
+
+    oidc_use_admin_group = bool((security_config or {}).get("OIDC_USE_ADMIN_GROUP", True))
+    role_managed_by_oidc_group = auth_source == AUTH_SOURCE_OIDC and oidc_use_admin_group
+    can_edit_role = auth_source == AUTH_SOURCE_BUILTIN or (
+        auth_source == AUTH_SOURCE_OIDC and not role_managed_by_oidc_group
+    )
+
+    return {
+        "authSource": auth_source,
+        "canSetPassword": auth_source == AUTH_SOURCE_BUILTIN,
+        "canEditRole": can_edit_role,
+        "canEditEmail": auth_source in {AUTH_SOURCE_BUILTIN, AUTH_SOURCE_PROXY},
+        "canEditDisplayName": auth_source != AUTH_SOURCE_OIDC,
+    }
+
+
+def _sanitize_user(user: dict) -> dict:
+    """Remove sensitive fields from user dict before returning to client."""
+    sanitized = dict(user)
+    sanitized.pop("password_hash", None)
+    return sanitized
+
+
+def _oidc_role_management_message(security_config: dict[str, Any]) -> str:
+    admin_group = security_config.get("OIDC_ADMIN_GROUP", "")
+    if admin_group:
+        return (
+            "Admin roles for OIDC users are managed by the "
+            f"'{admin_group}' group in your identity provider"
+        )
+    return (
+        "Disable 'Use Admin Group for Authorization' in security settings "
+        "to manage roles manually"
+    )
+
+
+def _serialize_user(
+    user: dict[str, Any],
+    auth_method: str,
+    security_config: dict[str, Any] | None = None,
+) -> dict[str, Any]:
+    """Sanitize and enrich a user payload for API responses."""
+    payload = _sanitize_user(user)
+    payload["auth_source"] = normalize_auth_source(
+        payload.get("auth_source"),
+        payload.get("oidc_subject"),
+    )
+    payload["is_active"] = is_user_active_for_auth_mode(payload, auth_method)
+    payload["edit_capabilities"] = _get_user_edit_capabilities(
+        payload,
+        security_config=security_config,
+    )
+    return payload
+
+
+
+
+def _sync_all_cwa_users(user_db: UserDB) -> dict[str, int]:
+    """Sync all users from the Calibre-Web database into users.db."""
+    if not CWA_DB_PATH or not CWA_DB_PATH.exists():
+        raise FileNotFoundError("Calibre-Web database is not available")
+
+    db_path = os.fspath(CWA_DB_PATH)
+    db_uri = f"file:{db_path}?mode=ro&immutable=1"
+    conn = sqlite3.connect(db_uri, uri=True)
+    try:
+        cur = conn.cursor()
+        cur.execute("SELECT name, role, email FROM user")
+        rows = cur.fetchall()
+    finally:
+        conn.close()
+
+    return sync_cwa_users_from_rows(user_db, rows)
+
+
+def register_admin_routes(app: Flask, user_db: UserDB) -> None:
+    """Register admin user management routes on the Flask app."""
+
+    def _require_admin(f):
+        """Decorator to require admin session for admin routes.
+
+        In no-auth mode, everyone has access (is_admin defaults True).
+        In auth-required modes, requires an authenticated session with admin role.
+        Caches the resolved auth_mode in ``g.auth_mode`` for the request.
+        """
+        @wraps(f)
+        def decorated(*args, **kwargs):
+            auth_mode = load_active_auth_mode(CWA_DB_PATH, user_db=user_db)
+            g.auth_mode = auth_mode
+            if auth_mode != "none":
+                if "user_id" not in session:
+                    return jsonify({"error": "Authentication required"}), 401
+                if not session.get("is_admin", False):
+                    return jsonify({"error": "Admin access required"}), 403
+            return f(*args, **kwargs)
+        return decorated
+
+    @app.route("/api/admin/users", methods=["GET"])
+    @_require_admin
+    def admin_list_users():
+        """List all users."""
+        users = user_db.list_users()
+        auth_mode = g.auth_mode
+        security_config = load_config_file("security")
+        return jsonify([
+            _serialize_user(u, auth_mode, security_config=security_config)
+            for u in users
+        ])
+
+    @app.route("/api/admin/users", methods=["POST"])
+    @_require_admin
+    def admin_create_user():
+        """Create a new user with password authentication."""
+        data = request.get_json() or {}
+        auth_mode = g.auth_mode
+
+        username = (data.get("username") or "").strip()
+        password = data.get("password", "")
+        email = (data.get("email") or "").strip() or None
+        display_name = (data.get("display_name") or "").strip() or None
+        role = data.get("role", "user")
+
+        if auth_mode in {AUTH_SOURCE_PROXY, AUTH_SOURCE_CWA}:
+            return jsonify({
+                "error": "Local user creation is disabled in this authentication mode",
+                "message": (
+                    "Users are provisioned by your external authentication source. "
+                    "Switch to builtin or OIDC mode to create local users."
+                ),
+            }), 400
+
+        if not username:
+            return jsonify({"error": "Username is required"}), 400
+        if not password or len(password) < 4:
+            return jsonify({"error": "Password must be at least 4 characters"}), 400
+        if role not in ("admin", "user"):
+            return jsonify({"error": "Role must be 'admin' or 'user'"}), 400
+
+        # First user is always admin
+        existing_users = user_db.list_users()
+        if not existing_users:
+            role = "admin"
+
+        # Check if username already exists
+        if user_db.get_user(username=username):
+            return jsonify({"error": "Username already exists"}), 409
+
+        password_hash = generate_password_hash(password)
+        try:
+            user = user_db.create_user(
+                username=username,
+                password_hash=password_hash,
+                email=email,
+                display_name=display_name,
+                auth_source=AUTH_SOURCE_BUILTIN,
+                role=role,
+            )
+        except ValueError:
+            return jsonify({"error": "Username already exists"}), 409
+        logger.info(
+            "Shelfmark user created "
+            f"(source=manual_admin_create, created_by={session.get('user_id', 'unknown')}, "
+            f"username={username}, role={role}, auth_source={AUTH_SOURCE_BUILTIN})"
+        )
+        return jsonify(
+            _serialize_user(
+                user,
+                g.auth_mode,
+                security_config=load_config_file("security"),
+            )
+        ), 201
+
+    @app.route("/api/admin/users/<int:user_id>", methods=["GET"])
+    @_require_admin
+    def admin_get_user(user_id):
+        """Get a user by ID with their settings."""
+        user = user_db.get_user(user_id=user_id)
+        if not user:
+            return jsonify({"error": "User not found"}), 404
+
+        result = _serialize_user(
+            user,
+            g.auth_mode,
+            security_config=load_config_file("security"),
+        )
+        result["settings"] = user_db.get_user_settings(user_id)
+        return jsonify(result)
+
+    @app.route("/api/admin/users/<int:user_id>", methods=["PUT"])
+    @_require_admin
+    def admin_update_user(user_id):
+        """Update user fields and/or settings."""
+        user = user_db.get_user(user_id=user_id)
+        if not user:
+            return jsonify({"error": "User not found"}), 404
+
+        data = request.get_json() or {}
+        security_config = load_config_file("security")
+        auth_source = normalize_auth_source(
+            user.get("auth_source"),
+            user.get("oidc_subject"),
+        )
+        capabilities = _get_user_edit_capabilities(user, security_config=security_config)
+
+        # Handle optional password update
+        password = data.get("password", "")
+        if password:
+            if not capabilities["canSetPassword"]:
+                return jsonify({
+                    "error": f"Cannot set password for {auth_source.upper()} users",
+                    "message": "Password authentication is only available for local users.",
+                }), 400
+            if len(password) < 4:
+                return jsonify({"error": "Password must be at least 4 characters"}), 400
+            user_db.update_user(user_id, password_hash=generate_password_hash(password))
+
+        # Update user fields
+        user_fields = {}
+        for field in ("role", "email", "display_name"):
+            if field in data:
+                user_fields[field] = data[field]
+
+        if "role" in user_fields and user_fields["role"] not in ("admin", "user"):
+            return jsonify({"error": "Role must be 'admin' or 'user'"}), 400
+
+        role_changed = "role" in user_fields and user_fields["role"] != user.get("role")
+        email_changed = "email" in user_fields and user_fields["email"] != user.get("email")
+        display_name_changed = (
+            "display_name" in user_fields
+            and user_fields["display_name"] != user.get("display_name")
+        )
+
+        if role_changed and not capabilities["canEditRole"]:
+            if auth_source == AUTH_SOURCE_OIDC:
+                return jsonify({
+                    "error": "Cannot change role for OIDC user when group-based authorization is enabled",
+                    "message": _oidc_role_management_message(security_config),
+                }), 400
+
+            return jsonify({
+                "error": f"Cannot change role for {auth_source.upper()} users",
+                "message": "Role is managed by the external authentication source.",
+            }), 400
+
+        if email_changed and not capabilities["canEditEmail"]:
+            if auth_source == AUTH_SOURCE_CWA:
+                return jsonify({
+                    "error": "Cannot change email for CWA users",
+                    "message": "Email is synced from Calibre-Web.",
+                }), 400
+
+            return jsonify({
+                "error": "Cannot change email for OIDC users",
+                "message": "Email is managed by your identity provider.",
+            }), 400
+
+        if display_name_changed and not capabilities["canEditDisplayName"]:
+            return jsonify({
+                "error": "Cannot change display name for OIDC users",
+                "message": "Display name is managed by your identity provider.",
+            }), 400
+
+        # Allow demoting the last admin account.
+        # Auth mode resolution automatically falls back to "none" when no
+        # local password admin remains.
+
+        # Avoid unnecessary writes for no-op field updates.
+        for field in ("role", "email", "display_name"):
+            if field in user_fields and user_fields[field] == user.get(field):
+                user_fields.pop(field)
+
+        if user_fields:
+            user_db.update_user(user_id, **user_fields)
+
+        # Update per-user settings
+        if "settings" in data:
+            if not isinstance(data["settings"], dict):
+                return jsonify({"error": "Settings must be an object"}), 400
+
+            validated_settings, validation_errors = validate_user_settings(data["settings"])
+            if validation_errors:
+                return jsonify({
+                    "error": "Invalid settings payload",
+                    "details": validation_errors,
+                }), 400
+
+            user_db.set_user_settings(user_id, validated_settings)
+            # Ensure runtime reads see updated per-user overrides immediately.
+            try:
+                from shelfmark.core.config import config as app_config
+                app_config.refresh(force=True)
+            except Exception:
+                pass
+
+        updated = user_db.get_user(user_id=user_id)
+        result = _serialize_user(
+            updated,
+            g.auth_mode,
+            security_config=security_config,
+        )
+        result["settings"] = user_db.get_user_settings(user_id)
+        logger.info(f"Admin updated user {user_id}")
+        return jsonify(result)
+
+    @app.route("/api/admin/users/sync-cwa", methods=["POST"])
+    @_require_admin
+    def admin_sync_cwa_users():
+        """Manually sync users from Calibre-Web into users.db."""
+        if g.auth_mode != AUTH_SOURCE_CWA:
+            return jsonify({
+                "error": "CWA sync is only available when CWA authentication is enabled",
+            }), 400
+
+        try:
+            summary = _sync_all_cwa_users(user_db)
+        except FileNotFoundError:
+            return jsonify({
+                "error": "Calibre-Web database is not available",
+                "message": "Verify app.db is mounted and readable at /auth/app.db.",
+            }), 503
+        except Exception as exc:
+            logger.error(f"Failed to sync CWA users: {exc}")
+            return jsonify({
+                "error": "Failed to sync users from Calibre-Web",
+            }), 500
+
+        message = (
+            f"Synced {summary['total']} CWA users "
+            f"({summary['created']} created, {summary['updated']} updated, "
+            f"{summary.get('deleted', 0)} deleted)."
+        )
+        logger.info(message)
+        return jsonify({
+            "success": True,
+            "message": message,
+            **summary,
+        })
+
+    register_admin_settings_routes(app, user_db, _require_admin)
+
+    @app.route("/api/admin/users/<int:user_id>", methods=["DELETE"])
+    @_require_admin
+    def admin_delete_user(user_id):
+        """Delete a user."""
+        # Prevent self-deletion
+        if session.get("db_user_id") == user_id:
+            return jsonify({"error": "Cannot delete your own account"}), 400
+
+        user = user_db.get_user(user_id=user_id)
+        if not user:
+            return jsonify({"error": "User not found"}), 404
+
+        auth_source = normalize_auth_source(
+            user.get("auth_source"),
+            user.get("oidc_subject"),
+        )
+        if auth_source == AUTH_SOURCE_CWA and auth_source == g.auth_mode:
+            return jsonify({
+                "error": f"Cannot delete active {auth_source.upper()} users",
+                "message": f"{auth_source.upper()} users are automatically re-provisioned on login.",
+            }), 400
+
+        # Allow deleting the last local admin account.
+        # Auth mode resolution automatically falls back to "none" when no
+        # local password admin remains.
+
+        user_db.delete_user(user_id)
+        logger.info(f"Admin deleted user {user_id}: {user['username']}")
+        return jsonify({"success": True})

shelfmark/core/admin_settings_routes.py

@@ -0,0 +1,258 @@
+"""Admin settings-introspection routes and settings validation helpers."""
+
+from typing import Any, Callable
+
+from flask import Flask, jsonify, request
+
+from shelfmark.config.notifications_settings import (
+    build_notification_test_result,
+    is_valid_notification_url,
+    normalize_notification_routes,
+)
+from shelfmark.config.users_settings import validate_search_preference_value
+from shelfmark.core.settings_registry import load_config_file
+from shelfmark.core.user_settings_overrides import (
+    build_user_preferences_payload as _build_user_preferences_payload,
+    get_ordered_user_overridable_fields as _get_ordered_user_overridable_fields,
+    get_settings_registry as _get_settings_registry,
+)
+from shelfmark.core.user_db import UserDB
+from shelfmark.core.request_policy import parse_policy_mode, validate_policy_rules
+
+
+def validate_user_settings(settings: dict[str, Any]) -> tuple[dict[str, Any], list[str]]:
+    settings_registry = _get_settings_registry()
+    field_map = settings_registry.get_settings_field_map()
+    overridable_map = settings_registry.get_user_overridable_fields()
+
+    valid: dict[str, Any] = {}
+    errors: list[str] = []
+    for key, value in settings.items():
+        if key not in field_map:
+            errors.append(f"Unknown setting: {key}")
+        elif key not in overridable_map:
+            errors.append(f"Setting not user-overridable: {key}")
+        else:
+            # null means "clear the per-user override; use global default"
+            if value is None:
+                valid[key] = None
+                continue
+
+            if key in {"REQUEST_POLICY_DEFAULT_EBOOK", "REQUEST_POLICY_DEFAULT_AUDIOBOOK"}:
+                if parse_policy_mode(value) is None:
+                    errors.append(f"Invalid policy mode for {key}: {value}")
+                    continue
+
+            if key == "REQUEST_POLICY_RULES":
+                normalized_rules, rule_errors = validate_policy_rules(value)
+                if rule_errors:
+                    errors.extend(rule_errors)
+                    continue
+                valid[key] = normalized_rules
+                continue
+
+            if key == "USER_NOTIFICATION_ROUTES":
+                normalized_routes = normalize_notification_routes(value)
+                invalid_count = sum(
+                    1
+                    for row in normalized_routes
+                    if row.get("url") and not is_valid_notification_url(str(row.get("url")))
+                )
+                if invalid_count:
+                    errors.append(
+                        (
+                            f"Invalid value for {key}: found {invalid_count} invalid URL(s). "
+                            "Use URL values with a valid scheme, e.g. discord://... or ntfys://..."
+                        )
+                    )
+                    continue
+                valid[key] = normalized_routes
+                continue
+
+            normalized_search_value, search_validation_error = validate_search_preference_value(key, value)
+            if search_validation_error:
+                errors.append(search_validation_error)
+                continue
+            if key in {
+                "SEARCH_MODE",
+                "METADATA_PROVIDER",
+                "METADATA_PROVIDER_AUDIOBOOK",
+                "DEFAULT_RELEASE_SOURCE",
+            }:
+                valid[key] = normalized_search_value
+                continue
+
+            valid[key] = value
+
+    return valid, errors
+
+
+def build_user_notification_test_response(
+    *,
+    user_id: int,
+    payload: Any,
+) -> tuple[dict[str, Any], int]:
+    from shelfmark.core.config import config as app_config
+
+    routes_input = app_config.get("USER_NOTIFICATION_ROUTES", [], user_id=user_id)
+    if isinstance(payload, dict):
+        if "USER_NOTIFICATION_ROUTES" in payload:
+            routes_input = payload.get("USER_NOTIFICATION_ROUTES")
+        elif "routes" in payload:
+            routes_input = payload.get("routes")
+
+    result = build_notification_test_result(routes_input, scope_label="personal")
+    status_code = 200 if result.get("success", False) else 400
+    return result, status_code
+
+
+def register_admin_settings_routes(
+    app: Flask,
+    user_db: UserDB,
+    require_admin: Callable[[Callable[..., Any]], Callable[..., Any]],
+) -> None:
+    @app.route("/api/admin/download-defaults", methods=["GET"])
+    @require_admin
+    def admin_download_defaults():
+        config = load_config_file("downloads")
+        defaults = {
+            key: ("" if (value := config.get(key, field.default)) is None else value)
+            for key, field in _get_ordered_user_overridable_fields("downloads")
+        }
+
+        security_config = load_config_file("security")
+        defaults["OIDC_ADMIN_GROUP"] = security_config.get("OIDC_ADMIN_GROUP", "")
+        defaults["OIDC_USE_ADMIN_GROUP"] = security_config.get("OIDC_USE_ADMIN_GROUP", True)
+        defaults["OIDC_AUTO_PROVISION"] = security_config.get("OIDC_AUTO_PROVISION", True)
+        return jsonify(defaults)
+
+    @app.route("/api/admin/booklore-options", methods=["GET"])
+    @require_admin
+    def admin_booklore_options():
+        from shelfmark.core import admin_routes
+
+        return jsonify({
+            "libraries": admin_routes.get_booklore_library_options(),
+            "paths": admin_routes.get_booklore_path_options(),
+        })
+
+    @app.route("/api/admin/users/<int:user_id>/delivery-preferences", methods=["GET"])
+    @require_admin
+    def admin_get_delivery_preferences(user_id):
+        user = user_db.get_user(user_id=user_id)
+        if not user:
+            return jsonify({"error": "User not found"}), 404
+
+        try:
+            payload = _build_user_preferences_payload(user_db, user_id, "downloads")
+        except ValueError:
+            return jsonify({"error": "Downloads settings tab not found"}), 500
+
+        return jsonify(payload)
+
+    @app.route("/api/admin/users/<int:user_id>/search-preferences", methods=["GET"])
+    @require_admin
+    def admin_get_search_preferences(user_id):
+        user = user_db.get_user(user_id=user_id)
+        if not user:
+            return jsonify({"error": "User not found"}), 404
+
+        try:
+            payload = _build_user_preferences_payload(user_db, user_id, "search_mode")
+        except ValueError:
+            return jsonify({"error": "Search mode settings tab not found"}), 500
+
+        return jsonify(payload)
+
+    @app.route("/api/admin/users/<int:user_id>/notification-preferences", methods=["GET"])
+    @require_admin
+    def admin_get_notification_preferences(user_id):
+        user = user_db.get_user(user_id=user_id)
+        if not user:
+            return jsonify({"error": "User not found"}), 404
+
+        try:
+            payload = _build_user_preferences_payload(user_db, user_id, "notifications")
+        except ValueError:
+            return jsonify({"error": "Notifications settings tab not found"}), 500
+
+        return jsonify(payload)
+
+    @app.route("/api/admin/users/<int:user_id>/notification-preferences/test", methods=["POST"])
+    @require_admin
+    def admin_test_notification_preferences(user_id):
+        user = user_db.get_user(user_id=user_id)
+        if not user:
+            return jsonify({"error": "User not found"}), 404
+
+        payload = request.get_json(silent=True)
+        result, status_code = build_user_notification_test_response(
+            user_id=user_id,
+            payload=payload,
+        )
+        return jsonify(result), status_code
+
+    @app.route("/api/admin/settings/overrides-summary", methods=["GET"])
+    @require_admin
+    def admin_settings_overrides_summary():
+        settings_registry = _get_settings_registry()
+
+        tab_name = (request.args.get("tab") or "downloads").strip()
+        if not settings_registry.get_settings_tab(tab_name):
+            return jsonify({"error": f"Unknown settings tab: {tab_name}"}), 404
+
+        overridable_keys = list(settings_registry.get_user_overridable_fields(tab_name=tab_name))
+        keys_payload: dict[str, dict[str, Any]] = {}
+
+        for user_record in user_db.list_users():
+            user_settings = user_db.get_user_settings(user_record["id"])
+            if not isinstance(user_settings, dict):
+                continue
+
+            for key in overridable_keys:
+                if key not in user_settings or user_settings[key] is None:
+                    continue
+                entry = keys_payload.setdefault(key, {"count": 0, "users": []})
+                entry["users"].append({
+                    "userId": user_record["id"],
+                    "username": user_record["username"],
+                    "value": user_settings[key],
+                })
+
+        for summary in keys_payload.values():
+            summary["count"] = len(summary["users"])
+
+        return jsonify({"tab": tab_name, "keys": keys_payload})
+
+    @app.route("/api/admin/users/<int:user_id>/effective-settings", methods=["GET"])
+    @require_admin
+    def admin_get_effective_settings(user_id):
+        user = user_db.get_user(user_id=user_id)
+        if not user:
+            return jsonify({"error": "User not found"}), 404
+
+        from shelfmark.core.config import config as app_config
+        from shelfmark.core.settings_registry import is_value_from_env
+
+        field_map = _get_settings_registry().get_user_overridable_fields()
+        user_settings = user_db.get_user_settings(user_id)
+        tab_config_cache: dict[str, dict[str, Any]] = {}
+        effective: dict[str, dict[str, Any]] = {}
+
+        for key, (field, tab_name) in sorted(field_map.items()):
+            value = app_config.get(key, field.default, user_id=user_id)
+            source = "default"
+
+            if field.env_supported and is_value_from_env(field):
+                source = "env_var"
+            elif key in user_settings and user_settings[key] is not None:
+                source = "user_override"
+                value = user_settings[key]
+            else:
+                tab_config = tab_config_cache.setdefault(tab_name, load_config_file(tab_name))
+                if key in tab_config:
+                    source = "global_config"
+
+            effective[key] = {"value": value, "source": source}
+
+        return jsonify(effective)

shelfmark/core/auth_modes.py

@@ -0,0 +1,150 @@
+"""Authentication mode, auth-source normalization, and admin access policy helpers."""
+
+import os
+from typing import Any, Mapping
+
+AUTH_SOURCE_BUILTIN = "builtin"
+AUTH_SOURCE_OIDC = "oidc"
+AUTH_SOURCE_PROXY = "proxy"
+AUTH_SOURCE_CWA = "cwa"
+AUTH_SOURCES = (
+    AUTH_SOURCE_BUILTIN,
+    AUTH_SOURCE_OIDC,
+    AUTH_SOURCE_PROXY,
+    AUTH_SOURCE_CWA,
+)
+AUTH_SOURCE_SET = frozenset(AUTH_SOURCES)
+_ALWAYS_ADMIN_SETTINGS_TABS = frozenset({"security", "users"})
+
+
+def has_local_password_admin(user_db: Any | None = None) -> bool:
+    """Return True when at least one local admin with a password exists."""
+    try:
+        db = user_db
+        if db is None:
+            from shelfmark.core.user_db import UserDB
+
+            config_root = os.environ.get("CONFIG_DIR", "/config")
+            db = UserDB(os.path.join(config_root, "users.db"))
+            db.initialize()
+
+        return db.has_admin_with_password()
+    except Exception:
+        return False
+
+
+def normalize_auth_source(
+    source: Any,
+    oidc_subject: Any = None,
+) -> str:
+    """Resolve a stable auth source value from persisted fields."""
+    normalized = str(source or "").strip().lower()
+    if normalized in AUTH_SOURCE_SET:
+        return normalized
+    if oidc_subject:
+        return AUTH_SOURCE_OIDC
+    return AUTH_SOURCE_BUILTIN
+
+
+def determine_auth_mode(
+    security_config: Mapping[str, Any],
+    cwa_db_path: Any | None,
+    *,
+    has_local_admin: bool = True,
+) -> str:
+    """Determine active auth mode from security config and runtime prerequisites."""
+    auth_mode = security_config.get("AUTH_METHOD", "none")
+
+    if auth_mode == AUTH_SOURCE_CWA and cwa_db_path:
+        return AUTH_SOURCE_CWA
+
+    if auth_mode == AUTH_SOURCE_BUILTIN and has_local_admin:
+        return AUTH_SOURCE_BUILTIN
+
+    if auth_mode == AUTH_SOURCE_PROXY and security_config.get("PROXY_AUTH_USER_HEADER"):
+        return AUTH_SOURCE_PROXY
+
+    if (
+        auth_mode == AUTH_SOURCE_OIDC
+        and has_local_admin
+        and security_config.get("OIDC_DISCOVERY_URL")
+        and security_config.get("OIDC_CLIENT_ID")
+    ):
+        return AUTH_SOURCE_OIDC
+
+    return "none"
+
+
+def load_active_auth_mode(
+    cwa_db_path: Any | None,
+    *,
+    user_db: Any | None = None,
+) -> str:
+    """Resolve active auth mode using current security config and runtime prerequisites."""
+    try:
+        from shelfmark.core.settings_registry import load_config_file
+
+        security_config = load_config_file("security")
+        return determine_auth_mode(
+            security_config,
+            cwa_db_path,
+            has_local_admin=has_local_password_admin(user_db),
+        )
+    except Exception:
+        return "none"
+
+
+def is_user_active_for_auth_mode(user: Mapping[str, Any], auth_mode: str) -> bool:
+    """Return whether a user can authenticate under the current auth mode."""
+    source = normalize_auth_source(user.get("auth_source"), user.get("oidc_subject"))
+    if source == AUTH_SOURCE_BUILTIN:
+        return auth_mode in (AUTH_SOURCE_BUILTIN, AUTH_SOURCE_OIDC)
+    return source == auth_mode
+
+
+def is_settings_or_onboarding_path(path: str) -> bool:
+    """Return True when request path targets protected admin settings routes."""
+    return path.startswith("/api/settings") or path.startswith("/api/onboarding")
+
+
+def get_settings_tab_from_path(path: str) -> str | None:
+    """Extract tab name from /api/settings/<tab>[...] paths."""
+    if not path.startswith("/api/settings/"):
+        return None
+
+    suffix = path[len("/api/settings/"):]
+    if not suffix:
+        return None
+
+    return suffix.split("/", 1)[0] or None
+
+
+def should_restrict_settings_to_admin(
+    _users_config: Mapping[str, Any],
+) -> bool:
+    """Settings/onboarding is always admin-only."""
+    return True
+
+
+def requires_admin_for_settings_access(
+    path: str,
+    users_config: Mapping[str, Any],
+) -> bool:
+    """Return whether this settings/onboarding request requires admin privileges."""
+    tab_name = get_settings_tab_from_path(path)
+    if tab_name in _ALWAYS_ADMIN_SETTINGS_TABS:
+        return True
+
+    return should_restrict_settings_to_admin(users_config)
+
+
+def get_auth_check_admin_status(
+    _auth_mode: str,
+    _users_config: Mapping[str, Any],
+    session_data: Mapping[str, Any],
+) -> bool:
+    """Resolve /api/auth/check `is_admin` as the session's real admin role."""
+    if "user_id" not in session_data:
+        return False
+
+    return bool(session_data.get("is_admin", False))

shelfmark/core/cache.py

@@ -62,6 +62,14 @@ class CacheService:
                 return True
             return False
 
+    def invalidate_prefix(self, prefix: str) -> int:
+        """Remove all cache entries whose keys start with prefix."""
+        with self._lock:
+            matching_keys = [key for key in self._cache if key.startswith(prefix)]
+            for key in matching_keys:
+                del self._cache[key]
+            return len(matching_keys)
+
     def clear(self) -> None:
         """Clear all cache entries."""
         with self._lock:

shelfmark/core/config.py

@@ -1,11 +1,15 @@
 """Configuration singleton with ENV > config file > default resolution."""
 
+import os
+import sqlite3
+import time
 from threading import Lock
 from typing import Any, Dict, Optional
 
 # Import lazily to avoid circular imports
 _registry_module = None
 _env_module = None
+_user_db_module = None
 
 
 def _get_registry():
@@ -26,6 +30,15 @@ def _get_env():
     return _env_module
 
 
+def _get_user_db_module():
+    """Lazy import of user DB module to avoid optional dependency loops."""
+    global _user_db_module
+    if _user_db_module is None:
+        from shelfmark.core.user_db import UserDB
+        _user_db_module = UserDB
+    return _user_db_module
+
+
 class Config:
     """
     Dynamic configuration singleton that provides live settings access.
@@ -36,7 +49,6 @@ class Config:
 
     _instance: Optional['Config'] = None
     _lock = Lock()
-
     def __new__(cls) -> 'Config':
         if cls._instance is None:
             with cls._lock:
@@ -51,8 +63,13 @@ class Config:
         self._cache: Dict[str, Any] = {}
         self._field_map: Dict[str, tuple] = {}  # key -> (field, tab_name)
         self._cache_lock = Lock()
+        self._user_settings_cache: Dict[int, Dict[str, Any]] = {}
+        self._user_settings_cache_lock = Lock()
+        self._user_db = None
+        self._user_db_load_attempted = False
         self._initialized = True
         self._loaded = False
+        self._last_refresh_time: float = 0.0
 
     def _ensure_loaded(self) -> None:
         """Ensure settings are loaded from the registry."""
@@ -69,6 +86,7 @@ class Config:
         # This handles cases where config is accessed before settings are registered
         try:
             import shelfmark.config.settings  # noqa: F401 - main app settings
+            import shelfmark.config.notifications_settings  # noqa: F401 - notifications settings
             import shelfmark.release_sources  # noqa: F401 - plugin settings
             import shelfmark.metadata_providers  # noqa: F401 - plugin settings
         except ImportError:
@@ -101,29 +119,105 @@ class Config:
 
         self._loaded = True
 
-    def refresh(self) -> None:
+    def refresh(self, force: bool = False) -> None:
         """
         Refresh all cached settings from config files.
 
         Call this after settings are updated via the UI to ensure
         the config singleton reflects the new values.
+
+        Multiple calls within a short window (50 ms) are coalesced to
+        avoid redundant disk I/O when several helpers each call refresh()
+        during the same request.  Pass ``force=True`` to bypass the guard
+        (e.g. after a settings write).
         """
+        now = time.monotonic()
+        if not force and (now - self._last_refresh_time) < 0.05:
+            return
+
         with self._cache_lock:
             self._loaded = False
             self._load_settings()
+        with self._user_settings_cache_lock:
+            self._user_settings_cache.clear()
+        self._user_db = None
+        self._user_db_load_attempted = False
+        self._last_refresh_time = time.monotonic()
 
-    def get(self, key: str, default: Any = None) -> Any:
+    def _get_user_db(self):
+        """Get or initialize a UserDB handle if available."""
+        if self._user_db is not None:
+            return self._user_db
+        if self._user_db_load_attempted:
+            return None
+
+        self._user_db_load_attempted = True
+        try:
+            user_db_cls = _get_user_db_module()
+            db_path = os.path.join(os.environ.get("CONFIG_DIR", "/config"), "users.db")
+            user_db = user_db_cls(db_path)
+            user_db.initialize()
+            self._user_db = user_db
+            return self._user_db
+        except Exception:
+            # Multi-user support is optional; fall back to global config when unavailable.
+            return None
+
+    def _get_user_settings(self, user_id: int) -> Dict[str, Any]:
+        """Get cached per-user settings from user DB."""
+        with self._user_settings_cache_lock:
+            if user_id in self._user_settings_cache:
+                return self._user_settings_cache[user_id]
+
+        user_db = self._get_user_db()
+        if user_db is None:
+            return {}
+
+        try:
+            settings = user_db.get_user_settings(user_id)
+        except (sqlite3.OperationalError, OSError, ValueError, TypeError):
+            return {}
+
+        if not isinstance(settings, dict):
+            settings = {}
+
+        with self._user_settings_cache_lock:
+            self._user_settings_cache[user_id] = settings
+        return settings
+
+    def _get_user_override(self, user_id: int, key: str) -> Any:
+        """Get a user override for a specific key."""
+        user_settings = self._get_user_settings(user_id)
+        return user_settings.get(key)
+
+    def get(self, key: str, default: Any = None, user_id: Optional[int] = None) -> Any:
         """
         Get a setting value by key.
 
         Args:
             key: The setting key (e.g., 'MAX_RETRY')
             default: Default value if setting not found
+            user_id: Optional DB user ID for per-user setting overrides
 
         Returns:
             The setting value, or default if not found
         """
         self._ensure_loaded()
+
+        if key in self._field_map:
+            field, _ = self._field_map[key]
+            registry = _get_registry()
+
+            # Deployment-level ENV values always win.
+            if field.env_supported and registry.is_value_from_env(field):
+                return self._cache.get(key, default)
+
+            # User overrides are only available for explicitly overridable fields.
+            if user_id is not None and getattr(field, "user_overridable", False):
+                user_value = self._get_user_override(user_id, key)
+                if user_value is not None:
+                    return user_value
+
         return self._cache.get(key, default)
 
     def __getattr__(self, name: str) -> Any:

shelfmark/core/cwa_user_sync.py

@@ -0,0 +1,94 @@
+"""Helpers for provisioning and syncing Calibre-Web users into users.db."""
+
+from __future__ import annotations
+
+from typing import Any, Iterable
+
+from shelfmark.core.auth_modes import AUTH_SOURCE_CWA, normalize_auth_source
+from shelfmark.core.external_user_linking import upsert_external_user
+from shelfmark.core.user_db import UserDB
+
+_CWA_ALIAS_SUFFIX = "__cwa"
+
+
+def _normalize_email(value: Any) -> str | None:
+    if value is None:
+        return None
+    email = str(value).strip()
+    return email or None
+
+
+def upsert_cwa_user(
+    user_db: UserDB,
+    cwa_username: str,
+    cwa_email: str | None,
+    role: str,
+    context: str | None = None,
+) -> tuple[dict[str, Any], str]:
+    """Create/update a CWA-backed user with collision-safe matching."""
+    normalized_email = _normalize_email(cwa_email)
+    collision_strategy = "alias" if normalized_email else "takeover"
+    user, action = upsert_external_user(
+        user_db,
+        auth_source="cwa",
+        username=cwa_username,
+        email=normalized_email,
+        role=role,
+        allow_email_link=True,
+        collision_strategy=collision_strategy,
+        alias_suffix=_CWA_ALIAS_SUFFIX,
+        context=context,
+    )
+    if user is None:
+        raise RuntimeError("Unexpected CWA user sync result: no user returned")
+    return user, action
+
+
+def sync_cwa_users_from_rows(
+    user_db: UserDB,
+    rows: Iterable[tuple[Any, Any, Any]],
+) -> dict[str, int]:
+    """Sync CWA users from raw `(name, role_flags, email)` rows."""
+    created = 0
+    updated = 0
+    active_cwa_user_ids: set[int] = set()
+    for username, role_flags, email in rows:
+        normalized_username = str(username or "").strip()
+        if not normalized_username:
+            continue
+
+        role = "admin" if (int(role_flags or 0) & 1) == 1 else "user"
+        user, action = upsert_cwa_user(
+            user_db,
+            cwa_username=normalized_username,
+            cwa_email=_normalize_email(email),
+            role=role,
+            context="cwa_manual_sync",
+        )
+        active_cwa_user_ids.add(int(user["id"]))
+        if action == "created":
+            created += 1
+        else:
+            updated += 1
+
+    deleted = 0
+    for existing_user in user_db.list_users():
+        if normalize_auth_source(
+            existing_user.get("auth_source"),
+            existing_user.get("oidc_subject"),
+        ) != AUTH_SOURCE_CWA:
+            continue
+
+        existing_id = int(existing_user.get("id") or 0)
+        if existing_id in active_cwa_user_ids:
+            continue
+
+        user_db.delete_user(existing_id)
+        deleted += 1
+
+    return {
+        "created": created,
+        "updated": updated,
+        "deleted": deleted,
+        "total": created + updated,
+    }

shelfmark/core/download_history_service.py

@@ -0,0 +1,306 @@
+"""Persistence helpers for canonical download activity rows."""
+
+from __future__ import annotations
+
+import os
+import sqlite3
+import threading
+from datetime import datetime, timezone
+from typing import Any
+
+from shelfmark.core.logger import setup_logger
+from shelfmark.core.models import TERMINAL_QUEUE_STATUSES
+from shelfmark.core.request_helpers import normalize_optional_positive_int, normalize_optional_text, now_utc_iso
+
+logger = setup_logger(__name__)
+
+
+VALID_TERMINAL_STATUSES = frozenset(s.value for s in TERMINAL_QUEUE_STATUSES)
+ACTIVE_DOWNLOAD_STATUS = "active"
+VALID_ORIGINS = frozenset({"direct", "requested"})
+
+
+def _normalize_task_id(task_id: Any) -> str:
+    normalized = normalize_optional_text(task_id)
+    if normalized is None:
+        raise ValueError("task_id must be a non-empty string")
+    return normalized
+
+
+def _normalize_origin(origin: Any) -> str:
+    normalized = normalize_optional_text(origin)
+    if normalized is None:
+        return "direct"
+    lowered = normalized.lower()
+    if lowered not in VALID_ORIGINS:
+        raise ValueError("origin must be one of: direct, requested")
+    return lowered
+
+
+def _normalize_final_status(final_status: Any) -> str:
+    normalized = normalize_optional_text(final_status)
+    if normalized is None:
+        raise ValueError("final_status must be a non-empty string")
+    lowered = normalized.lower()
+    if lowered not in VALID_TERMINAL_STATUSES:
+        raise ValueError("final_status must be one of: complete, error, cancelled")
+    return lowered
+
+
+def _normalize_limit(value: Any, *, default: int, minimum: int, maximum: int) -> int:
+    if value is None:
+        return default
+    try:
+        parsed = int(value)
+    except (TypeError, ValueError) as exc:
+        raise ValueError("limit must be an integer") from exc
+    if parsed < minimum:
+        return minimum
+    if parsed > maximum:
+        return maximum
+    return parsed
+
+
+class DownloadHistoryService:
+    """Service for persisted canonical download activity rows."""
+
+    def __init__(self, db_path: str):
+        self._db_path = db_path
+        self._lock = threading.Lock()
+
+    def _connect(self) -> sqlite3.Connection:
+        conn = sqlite3.connect(self._db_path)
+        conn.row_factory = sqlite3.Row
+        conn.execute("PRAGMA foreign_keys = ON")
+        return conn
+
+    @staticmethod
+    def _row_to_dict(row: sqlite3.Row | None) -> dict[str, Any] | None:
+        return dict(row) if row is not None else None
+
+    @staticmethod
+    def _to_item_key(task_id: str) -> str:
+        return f"download:{task_id}"
+
+    @staticmethod
+    def _resolve_existing_download_path(value: Any) -> str | None:
+        normalized = normalize_optional_text(value)
+        if normalized is None:
+            return None
+        return normalized if os.path.exists(normalized) else None
+
+    @staticmethod
+    def to_download_payload(row: dict[str, Any]) -> dict[str, Any]:
+        return {
+            "id": row.get("task_id"),
+            "title": row.get("title"),
+            "author": row.get("author"),
+            "format": row.get("format"),
+            "size": row.get("size"),
+            "preview": row.get("preview"),
+            "content_type": row.get("content_type"),
+            "source": row.get("source"),
+            "source_display_name": row.get("source_display_name"),
+            "status_message": row.get("status_message"),
+            "download_path": DownloadHistoryService._resolve_existing_download_path(row.get("download_path")),
+            "added_time": DownloadHistoryService._iso_to_epoch(row.get("queued_at")),
+            "user_id": row.get("user_id"),
+            "username": row.get("username"),
+            "request_id": row.get("request_id"),
+        }
+
+    @staticmethod
+    def _iso_to_epoch(value: Any) -> float | None:
+        if not isinstance(value, str) or not value.strip():
+            return None
+        normalized = value.strip().replace("Z", "+00:00")
+        try:
+            parsed = datetime.fromisoformat(normalized)
+        except ValueError:
+            return None
+        if parsed.tzinfo is None:
+            parsed = parsed.replace(tzinfo=timezone.utc)
+        return parsed.timestamp()
+
+    @classmethod
+    def to_history_row(cls, row: dict[str, Any], *, dismissed_at: str) -> dict[str, Any]:
+        task_id = str(row.get("task_id") or "").strip()
+        item_key = cls._to_item_key(task_id)
+        download_payload = cls.to_download_payload(row)
+        # Clear stale progress messages for non-error terminal states.
+        if row.get("final_status") in ("complete", "cancelled"):
+            download_payload["status_message"] = None
+        return {
+            "id": item_key,
+            "user_id": row.get("user_id"),
+            "item_type": "download",
+            "item_key": item_key,
+            "dismissed_at": dismissed_at,
+            "snapshot": {
+                "kind": "download",
+                "download": download_payload,
+            },
+            "origin": row.get("origin"),
+            "final_status": row.get("final_status"),
+            "terminal_at": row.get("terminal_at"),
+            "request_id": row.get("request_id"),
+            "source_id": task_id or None,
+        }
+
+    def record_download(
+        self,
+        *,
+        task_id: str,
+        user_id: int | None,
+        username: str | None,
+        request_id: int | None,
+        source: str,
+        source_display_name: str | None,
+        title: str,
+        author: str | None,
+        format: str | None,
+        size: str | None,
+        preview: str | None,
+        content_type: str | None,
+        origin: str,
+    ) -> None:
+        """Record a download at queue time with final_status='active'.
+
+        On first queue: inserts a new row.
+        On retry (row already exists): resets the row back to 'active'
+        so the normal finalize path works when the retry completes.
+        """
+        normalized_task_id = _normalize_task_id(task_id)
+        normalized_user_id = normalize_optional_positive_int(user_id, "user_id")
+        normalized_request_id = normalize_optional_positive_int(request_id, "request_id")
+        normalized_source = normalize_optional_text(source)
+        if normalized_source is None:
+            raise ValueError("source must be a non-empty string")
+        normalized_title = normalize_optional_text(title)
+        if normalized_title is None:
+            raise ValueError("title must be a non-empty string")
+        normalized_origin = _normalize_origin(origin)
+        recorded_at = now_utc_iso()
+
+        with self._lock:
+            conn = self._connect()
+            try:
+                conn.execute(
+                    """
+                INSERT INTO download_history (
+                    task_id, user_id, username, request_id,
+                    source, source_display_name,
+                    title, author, format, size, preview, content_type,
+                    origin, final_status,
+                    status_message, download_path,
+                    queued_at, terminal_at
+                )
+                VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, 'active', NULL, NULL, ?, ?)
+                ON CONFLICT(task_id) DO UPDATE SET
+                    final_status = 'active',
+                    status_message = NULL,
+                    download_path = NULL,
+                    terminal_at = ?
+                """,
+                    (
+                        normalized_task_id,
+                        normalized_user_id,
+                        normalize_optional_text(username),
+                        normalized_request_id,
+                        normalized_source,
+                        normalize_optional_text(source_display_name),
+                        normalized_title,
+                        normalize_optional_text(author),
+                        normalize_optional_text(format),
+                        normalize_optional_text(size),
+                        normalize_optional_text(preview),
+                        normalize_optional_text(content_type),
+                        normalized_origin,
+                        recorded_at,
+                        recorded_at,
+                        recorded_at,
+                    ),
+                )
+                conn.commit()
+            finally:
+                conn.close()
+
+    def finalize_download(
+        self,
+        *,
+        task_id: str,
+        final_status: str,
+        status_message: str | None = None,
+        download_path: str | None = None,
+    ) -> None:
+        """Update an existing download row to its terminal state."""
+        normalized_task_id = _normalize_task_id(task_id)
+        normalized_final_status = _normalize_final_status(final_status)
+        normalized_status_message = normalize_optional_text(status_message)
+        normalized_download_path = normalize_optional_text(download_path)
+        effective_terminal_at = now_utc_iso()
+
+        with self._lock:
+            conn = self._connect()
+            try:
+                cursor = conn.execute(
+                    """
+                    UPDATE download_history
+                    SET final_status = ?,
+                        status_message = ?,
+                        download_path = ?,
+                        terminal_at = ?
+                    WHERE task_id = ? AND final_status = 'active'
+                    """,
+                    (
+                        normalized_final_status,
+                        normalized_status_message,
+                        normalized_download_path,
+                        effective_terminal_at,
+                        normalized_task_id,
+                    ),
+                )
+                rowcount = int(cursor.rowcount) if cursor.rowcount is not None else 0
+                if rowcount < 1:
+                    logger.warning(
+                        "finalize_download: no active row found for task_id=%s (may have been missed at queue time)",
+                        normalized_task_id,
+                    )
+                conn.commit()
+            finally:
+                conn.close()
+
+    def get_by_task_id(self, task_id: str) -> dict[str, Any] | None:
+        normalized_task_id = _normalize_task_id(task_id)
+        conn = self._connect()
+        try:
+            row = conn.execute(
+                "SELECT * FROM download_history WHERE task_id = ?",
+                (normalized_task_id,),
+            ).fetchone()
+            return self._row_to_dict(row)
+        finally:
+            conn.close()
+
+    def list_recent(
+        self,
+        *,
+        user_id: int | None,
+        limit: int = 200,
+    ) -> list[dict[str, Any]]:
+        normalized_user_id = normalize_optional_positive_int(user_id, "user_id")
+        normalized_limit = _normalize_limit(limit, default=200, minimum=1, maximum=1000)
+        query = "SELECT * FROM download_history"
+        params: list[Any] = []
+        if normalized_user_id is not None:
+            query += " WHERE user_id = ?"
+            params.append(normalized_user_id)
+        query += " ORDER BY terminal_at DESC, id DESC LIMIT ?"
+        params.append(normalized_limit)
+
+        conn = self._connect()
+        try:
+            rows = conn.execute(query, params).fetchall()
+            return [dict(row) for row in rows]
+        finally:
+            conn.close()

shelfmark/core/external_user_linking.py

@@ -0,0 +1,283 @@
+"""Shared external identity matching and provisioning helpers."""
+
+from __future__ import annotations
+
+import re
+from typing import Any, Literal
+
+from shelfmark.core.auth_modes import normalize_auth_source
+from shelfmark.core.logger import setup_logger
+from shelfmark.core.user_db import UserDB
+
+UNSET = object()
+
+CollisionStrategy = Literal["takeover", "suffix", "alias"]
+MatchReason = Literal[
+    "subject_match",
+    "existing_source_username_match",
+    "unique_email_match",
+]
+
+logger = setup_logger(__name__)
+
+
+def _normalize_username(value: Any) -> str:
+    return str(value or "").strip()
+
+
+def _normalize_email(value: Any) -> str | None:
+    if value is None:
+        return None
+    email = str(value).strip()
+    return email or None
+
+
+def _normalize_display_name(value: Any) -> str | None:
+    if value is None:
+        return None
+    name = str(value).strip()
+    return name or None
+
+
+def _email_key(value: str | None) -> str:
+    return (value or "").strip().lower()
+
+
+def _normalize_role(value: Any) -> str:
+    return "admin" if str(value or "").strip().lower() == "admin" else "user"
+
+
+def _get_by_subject(user_db: UserDB, subject_field: str | None, subject: str | None) -> dict[str, Any] | None:
+    if not subject_field or not subject:
+        return None
+    if subject_field == "oidc_subject":
+        return user_db.get_user(oidc_subject=subject)
+    return None
+
+
+def find_unique_user_by_email(user_db: UserDB, email: str | None) -> dict[str, Any] | None:
+    key = _email_key(_normalize_email(email))
+    if not key:
+        return None
+
+    matches = [u for u in user_db.list_users() if _email_key(u.get("email")) == key]
+    return matches[0] if len(matches) == 1 else None
+
+
+def find_external_user_match(
+    user_db: UserDB,
+    *,
+    auth_source: str,
+    username: str,
+    email: str | None,
+    subject_field: str | None = None,
+    subject: str | None = None,
+    allow_email_link: bool = False,
+) -> tuple[dict[str, Any] | None, MatchReason | None]:
+    """Find an existing local user that should be linked to an external identity."""
+    normalized_username = _normalize_username(username)
+    normalized_email = _normalize_email(email)
+
+    by_subject = _get_by_subject(user_db, subject_field, subject)
+    if by_subject is not None:
+        return by_subject, "subject_match"
+
+    by_username = user_db.get_user(username=normalized_username)
+    if by_username and normalize_auth_source(
+        by_username.get("auth_source"),
+        by_username.get("oidc_subject"),
+    ) == auth_source:
+        return by_username, "existing_source_username_match"
+
+    if allow_email_link:
+        return find_unique_user_by_email(user_db, normalized_email), "unique_email_match"
+    return None, None
+
+
+def _build_updates(
+    *,
+    auth_source: str,
+    role: str,
+    sync_role: bool,
+    email: str | None | object,
+    display_name: str | None | object,
+    subject_field: str | None,
+    subject: str | None,
+) -> dict[str, Any]:
+    updates: dict[str, Any] = {"auth_source": auth_source}
+    if sync_role:
+        updates["role"] = _normalize_role(role)
+    if email is not UNSET:
+        updates["email"] = _normalize_email(email)
+    if display_name is not UNSET:
+        updates["display_name"] = _normalize_display_name(display_name)
+    if subject_field == "oidc_subject" and subject:
+        updates["oidc_subject"] = subject
+    return updates
+
+
+def _next_suffix_username(user_db: UserDB, base_username: str) -> str:
+    candidate = base_username
+    suffix = 1
+    while user_db.get_user(username=candidate):
+        candidate = f"{base_username}_{suffix}"
+        suffix += 1
+    return candidate
+
+
+def _find_existing_alias_user(
+    user_db: UserDB,
+    *,
+    auth_source: str,
+    alias_base: str,
+) -> dict[str, Any] | None:
+    pattern = re.compile(rf"^{re.escape(alias_base)}(?:_\d+)?$")
+    candidates = [
+        user for user in user_db.list_users()
+        if pattern.match(str(user.get("username") or ""))
+        and normalize_auth_source(user.get("auth_source"), user.get("oidc_subject")) == auth_source
+    ]
+    if not candidates:
+        return None
+    return sorted(candidates, key=lambda user: int(user.get("id") or 0))[0]
+
+
+def _resolve_create_username(
+    user_db: UserDB,
+    *,
+    auth_source: str,
+    requested_username: str,
+    strategy: CollisionStrategy,
+    alias_suffix: str,
+) -> tuple[str | None, dict[str, Any] | None, str]:
+    existing = user_db.get_user(username=requested_username)
+    if not existing:
+        return requested_username, None, "new_username_available"
+
+    if strategy == "takeover":
+        return None, existing, "username_collision_takeover"
+
+    if strategy == "suffix":
+        return _next_suffix_username(user_db, requested_username), None, "username_collision_suffix"
+
+    alias_base = f"{requested_username}{alias_suffix}"
+    alias_existing = _find_existing_alias_user(
+        user_db,
+        auth_source=auth_source,
+        alias_base=alias_base,
+    )
+    if alias_existing is not None:
+        return None, alias_existing, "reuse_existing_alias"
+    return _next_suffix_username(user_db, alias_base), None, "username_collision_alias"
+
+
+def upsert_external_user(
+    user_db: UserDB,
+    *,
+    auth_source: str,
+    username: str,
+    role: str,
+    email: str | None | object = UNSET,
+    display_name: str | None | object = UNSET,
+    subject_field: str | None = None,
+    subject: str | None = None,
+    allow_email_link: bool = False,
+    sync_role: bool = True,
+    allow_create: bool = True,
+    collision_strategy: CollisionStrategy = "takeover",
+    alias_suffix: str | None = None,
+    context: str | None = None,
+) -> tuple[dict[str, Any] | None, str]:
+    """Create/update a user from an external auth identity.
+
+    Returns `(user, action)` where action is one of:
+    - `"updated"`
+    - `"created"`
+    - `"not_found"` (when `allow_create=False` and no link target exists)
+    """
+    normalized_username = _normalize_username(username)
+    if not normalized_username:
+        raise ValueError("External username is required")
+
+    normalized_email = _normalize_email(email) if email is not UNSET else None
+    normalized_display_name = (
+        _normalize_display_name(display_name) if display_name is not UNSET else None
+    )
+    normalized_role = _normalize_role(role)
+
+    matched, match_reason = find_external_user_match(
+        user_db,
+        auth_source=auth_source,
+        username=normalized_username,
+        email=normalized_email,
+        subject_field=subject_field,
+        subject=subject,
+        allow_email_link=allow_email_link,
+    )
+    updates = _build_updates(
+        auth_source=auth_source,
+        role=normalized_role,
+        sync_role=sync_role,
+        email=normalized_email if email is not UNSET else UNSET,
+        display_name=normalized_display_name if display_name is not UNSET else UNSET,
+        subject_field=subject_field,
+        subject=subject,
+    )
+    if matched is not None:
+        user_db.update_user(matched["id"], **updates)
+        mapped = user_db.get_user(user_id=matched["id"]) or matched
+        logger.info(
+            "External user mapped to existing Shelfmark user "
+            f"(source={auth_source}, context={context or 'unspecified'}, reason={match_reason}, "
+            f"external_username={normalized_username}, shelfmark_user_id={mapped['id']}, "
+            f"shelfmark_username={mapped['username']})"
+        )
+        return mapped, "updated"
+
+    if not allow_create:
+        logger.info(
+            "External user could not be mapped and creation is disabled "
+            f"(source={auth_source}, context={context or 'unspecified'}, "
+            f"external_username={normalized_username})"
+        )
+        return None, "not_found"
+
+    resolved_alias_suffix = alias_suffix or f"__{auth_source}"
+    create_username, takeover_target, create_reason = _resolve_create_username(
+        user_db,
+        auth_source=auth_source,
+        requested_username=normalized_username,
+        strategy=collision_strategy,
+        alias_suffix=resolved_alias_suffix,
+    )
+    if takeover_target is not None:
+        user_db.update_user(takeover_target["id"], **updates)
+        mapped = user_db.get_user(user_id=takeover_target["id"]) or takeover_target
+        logger.info(
+            "External user mapped to existing Shelfmark user "
+            f"(source={auth_source}, context={context or 'unspecified'}, reason={create_reason}, "
+            f"external_username={normalized_username}, shelfmark_user_id={mapped['id']}, "
+            f"shelfmark_username={mapped['username']})"
+        )
+        return mapped, "updated"
+
+    create_kwargs: dict[str, Any] = {
+        "username": create_username,
+        "auth_source": auth_source,
+        "role": normalized_role,
+    }
+    if email is not UNSET:
+        create_kwargs["email"] = normalized_email
+    if display_name is not UNSET:
+        create_kwargs["display_name"] = normalized_display_name
+    if subject_field == "oidc_subject" and subject:
+        create_kwargs["oidc_subject"] = subject
+
+    created = user_db.create_user(**create_kwargs)
+    logger.info(
+        "External user created Shelfmark user "
+        f"(source={auth_source}, context={context or 'unspecified'}, reason={create_reason}, "
+        f"external_username={normalized_username}, shelfmark_user_id={created['id']}, "
+        f"shelfmark_username={created['username']})"
+    )
+    return created, "created"

shelfmark/core/image_cache.py

@@ -11,6 +11,7 @@ from typing import Any, Dict, Optional, Tuple
 import requests
 
 from shelfmark.core.logger import setup_logger
+from shelfmark.download.network import get_ssl_verify
 
 logger = setup_logger(__name__)
 
@@ -482,6 +483,7 @@ class ImageCacheService:
                 timeout=(5, 10),
                 headers=FETCH_HEADERS,
                 stream=True,
+                verify=get_ssl_verify(url),
             )
             response.raise_for_status()
 

shelfmark/core/logger.py

@@ -39,22 +39,38 @@ class CustomLogger(logging.Logger):
         self.debug(msg, *args, exc_info=has_exception, **kwargs)
 
     def log_resource_usage(self):
-        import psutil
+        # Best-effort only; this should never raise during exception logging.
+        try:
+            import psutil
 
-        # Sum RSS of all processes for actual app memory
-        app_memory_mb = 0
-        for proc in psutil.process_iter(['memory_info']):
+            # Sum RSS of all processes for actual app memory (container-friendly),
+            # but fall back gracefully on platforms that restrict process enumeration.
+            app_memory_mb = 0.0
             try:
-                if proc.info['memory_info']:
-                    app_memory_mb += proc.info['memory_info'].rss / (1024 * 1024)
-            except (psutil.NoSuchProcess, psutil.AccessDenied):
-                continue
+                for proc in psutil.process_iter(['memory_info']):
+                    try:
+                        mem = proc.info.get('memory_info')
+                        if mem:
+                            app_memory_mb += mem.rss / (1024 * 1024)
+                    except (psutil.NoSuchProcess, psutil.AccessDenied, KeyError, AttributeError):
+                        continue
+            except (PermissionError, psutil.AccessDenied, OSError):
+                try:
+                    app_memory_mb = psutil.Process().memory_info().rss / (1024 * 1024)
+                except Exception:
+                    app_memory_mb = 0.0
 
-        memory = psutil.virtual_memory()
-        system_used_mb = memory.used / (1024 * 1024)
-        available_mb = memory.available / (1024 * 1024)
-        cpu_percent = psutil.cpu_percent()
-        self.debug(f"Container Memory: App={app_memory_mb:.2f} MB, System={system_used_mb:.2f} MB, Available={available_mb:.2f} MB, CPU: {cpu_percent:.2f}%")
+            memory = psutil.virtual_memory()
+            system_used_mb = memory.used / (1024 * 1024)
+            available_mb = memory.available / (1024 * 1024)
+            cpu_percent = psutil.cpu_percent()
+            self.debug(
+                f"Container Memory: App={app_memory_mb:.2f} MB, System={system_used_mb:.2f} MB, "
+                f"Available={available_mb:.2f} MB, CPU: {cpu_percent:.2f}%"
+            )
+        except Exception:
+            # Avoid breaking the original log call if psutil is missing or restricted.
+            return
 
 
 def setup_logger(name: str, log_file: Path = LOG_FILE) -> CustomLogger:

shelfmark/core/mirrors.py

@@ -19,10 +19,10 @@ def _get_config():
 
 # Default mirror lists (hardcoded fallbacks)
 DEFAULT_AA_MIRRORS = [
-    "https://annas-archive.se",
-    "https://annas-archive.li",
-    "https://annas-archive.pm",
-    "https://annas-archive.in",
+    "https://annas-archive.gl",
+    "https://annas-archive.pk",
+    "https://annas-archive.vg",
+    "https://annas-archive.gd",
 ]
 
 DEFAULT_LIBGEN_MIRRORS = [
@@ -52,22 +52,47 @@ def _normalize_mirror_url(url: str) -> str:
 
 def get_aa_mirrors() -> List[str]:
     """
-    Get Anna's Archive mirrors from config + defaults.
+    Get Anna's Archive mirrors.
 
     Returns:
-        List of AA mirror URLs, starting with defaults then custom additions.
+        Ordered list of AA mirror URLs.
+
+        If AA_MIRROR_URLS is configured, it is treated as the full list.
+        Otherwise, defaults are used and AA_ADDITIONAL_URLS (legacy) is appended.
+
+        Notes:
+        - The list is used to populate the AA mirror dropdown in Settings.
+        - When AA_BASE_URL is set to 'auto', mirrors are tried in the order listed.
     """
-    mirrors = [_normalize_mirror_url(url) for url in DEFAULT_AA_MIRRORS]
-    mirrors = [url for url in mirrors if url]
     config = _get_config()
 
-    additional = config.get("AA_ADDITIONAL_URLS", "")
-    if additional:
-        for url in additional.split(","):
+    mirrors: list[str] = []
+
+    configured_list = config.get("AA_MIRROR_URLS", None)
+    if isinstance(configured_list, list):
+        for url in configured_list:
+            normalized = _normalize_mirror_url(str(url))
+            if normalized and normalized not in mirrors:
+                mirrors.append(normalized)
+    elif isinstance(configured_list, str) and configured_list.strip():
+        # Allow comma-separated env/manual configs.
+        for url in configured_list.split(","):
             normalized = _normalize_mirror_url(url)
             if normalized and normalized not in mirrors:
                 mirrors.append(normalized)
 
+    if not mirrors:
+        mirrors = [_normalize_mirror_url(url) for url in DEFAULT_AA_MIRRORS]
+        mirrors = [url for url in mirrors if url]
+
+        # Backwards-compatible append-only behavior for legacy configs/env.
+        additional = config.get("AA_ADDITIONAL_URLS", "")
+        if additional:
+            for url in additional.split(","):
+                normalized = _normalize_mirror_url(url)
+                if normalized and normalized not in mirrors:
+                    mirrors.append(normalized)
+
     return mirrors
 
 

shelfmark/core/models.py

@@ -2,7 +2,7 @@
 
 from dataclasses import dataclass, field
 from pathlib import Path
-from typing import Dict, List, Optional
+from typing import Any, Dict, List, Optional
 from enum import Enum
 import re
 import time
@@ -35,14 +35,22 @@ class QueueStatus(str, Enum):
     """Enum for possible book queue statuses."""
     QUEUED = "queued"
     RESOLVING = "resolving"
+    LOCATING = "locating"
     DOWNLOADING = "downloading"
     COMPLETE = "complete"
-    AVAILABLE = "available"
     ERROR = "error"
-    DONE = "done"
     CANCELLED = "cancelled"
 
 
+TERMINAL_QUEUE_STATUSES: frozenset[QueueStatus] = frozenset({
+    QueueStatus.COMPLETE, QueueStatus.ERROR, QueueStatus.CANCELLED,
+})
+
+ACTIVE_QUEUE_STATUSES: frozenset[QueueStatus] = frozenset({
+    QueueStatus.QUEUED, QueueStatus.RESOLVING, QueueStatus.LOCATING, QueueStatus.DOWNLOADING,
+})
+
+
 class SearchMode(str, Enum):
     DIRECT = "direct"
     UNIVERSAL = "universal"
@@ -75,6 +83,7 @@ class DownloadTask:
     size: Optional[str] = None
     preview: Optional[str] = None
     content_type: Optional[str] = None  # "book (fiction)", "audiobook", "magazine", etc.
+    source_url: Optional[str] = None  # Original release URL used by source-specific handlers
 
     # Series info (for library naming templates)
     series_name: Optional[str] = None
@@ -88,6 +97,16 @@ class DownloadTask:
     # See SearchMode enum for behavioral differences
     search_mode: Optional[SearchMode] = None
 
+    # Output selection for post-processing.
+    # This is captured at queue time so in-flight tasks are not affected if the user changes settings later.
+    output_mode: Optional[str] = None  # e.g. "folder", "booklore", "email"
+    output_args: Dict[str, Any] = field(default_factory=dict)  # Per-output parameters (e.g. email recipient)
+
+    # User association (multi-user support)
+    user_id: Optional[int] = None  # DB user ID who queued this download
+    username: Optional[str] = None  # Username for {User} template variable
+    request_id: Optional[int] = None  # Origin request ID when queued from request fulfilment
+
     # Runtime state
     priority: int = 0
     added_time: float = field(default_factory=time.time)
@@ -95,6 +114,9 @@ class DownloadTask:
     status: QueueStatus = QueueStatus.QUEUED
     status_message: Optional[str] = None
     download_path: Optional[str] = None
+    last_error_message: Optional[str] = None
+    last_error_type: Optional[str] = None
+    staged_path: Optional[str] = None
 
     def __lt__(self, other):
         """Compare tasks for priority queue (lower priority number = higher precedence)."""
@@ -109,55 +131,6 @@ class DownloadTask:
         return build_filename(self.title, self.author, self.year, self.format)
 
 
-@dataclass
-class BookInfo:
-    """Data class representing book information."""
-    id: str
-    title: str
-    preview: Optional[str] = None
-    author: Optional[str] = None
-    publisher: Optional[str] = None
-    year: Optional[str] = None
-    language: Optional[str] = None
-    content: Optional[str] = None
-    format: Optional[str] = None
-    size: Optional[str] = None
-    info: Optional[Dict[str, List[str]]] = None
-    description: Optional[str] = None
-    download_urls: List[str] = field(default_factory=list)
-    download_path: Optional[str] = None
-    priority: int = 0
-    progress: Optional[float] = None
-    status_message: Optional[str] = None  # Detailed status message for UI display
-    added_time: Optional[float] = None  # Timestamp when added to queue
-    source: str = "direct_download"  # Release source handler to use for downloads
-    source_url: Optional[str] = None  # Link to source page (e.g., Anna's Archive)
-
-    def get_filename(self, fallback_url: Optional[str] = None) -> str:
-        """Build sanitized filename: 'Author - Title (Year).format'
-
-        Resolves format from self.format, download_urls, or fallback_url.
-
-        Args:
-            fallback_url: URL to extract format from if not already known
-
-        Returns:
-            Sanitized filename safe for filesystem use
-        """
-        # Resolve format if needed
-        if not self.format:
-            urls = [self.download_urls[0]] if self.download_urls else []
-            if fallback_url:
-                urls.append(fallback_url)
-            for url in urls:
-                ext = url.split(".")[-1].lower()
-                if ext and len(ext) <= 5 and ext.isalnum():
-                    self.format = ext
-                    break
-
-        return build_filename(self.title, self.author, self.year, self.format)
-
-
 @dataclass
 class SearchFilters:
     """Filters for book search queries."""

shelfmark/core/naming.py

@@ -10,11 +10,22 @@ from shelfmark.core.logger import setup_logger
 logger = setup_logger(__name__)
 
 
-TOKEN_PATTERN = re.compile(
-    r'\{([- ._/\[(]*)'   # prefix: space, dash, dot, underscore, slash, brackets
-    r'([A-Za-z]+)'        # token name
-    r'([- ._/\])]*)\}'    # suffix: space, dash, dot, underscore, slash, brackets
-)
+# Known variable tokens, sorted longest-first to avoid partial matches
+# e.g., "SeriesPosition" must match before "Series"
+KNOWN_TOKENS = [
+    'seriesposition',
+    'originalname',
+    'partnumber',
+    'subtitle',
+    'author',
+    'series',
+    'title',
+    'year',
+    'user',
+]
+
+# Match any {...} block for template parsing
+BRACE_PATTERN = re.compile(r'\{([^}]+)\}')
 
 # Characters that are invalid in filenames on various filesystems
 INVALID_CHARS = re.compile(r'[\\/:*?"<>|]')
@@ -88,37 +99,74 @@ def parse_naming_template(
     # Normalize metadata keys to lowercase for case-insensitive matching
     normalized = {k.lower(): v for k, v in metadata.items()}
 
-    def replace_token(match: re.Match) -> str:
-        prefix = match.group(1)
-        token_name = match.group(2).lower()
-        suffix = match.group(3)
+    def find_token(content: str) -> tuple[Optional[str], int]:
+        content_lower = content.lower()
+        for token in KNOWN_TOKENS:
+            idx = content_lower.find(token)
+            if idx != -1:
+                return token, idx
+        return None, -1
 
-        # Get the value for this token
-        value = normalized.get(token_name)
-
-        # Special handling for series position
-        if token_name == 'seriesposition':
+    def token_value(token: str) -> str:
+        value = normalized.get(token)
+        if token == 'seriesposition':
             value = format_series_position(value)
-
-        # Convert to string
         if value is None:
-            value = ""
-        else:
-            value = str(value).strip()
+            return ""
+        return str(value).strip()
 
-        # If value is empty, return empty string (no prefix/suffix)
+    def render_block(content: str) -> Optional[str]:
+        token, idx = find_token(content)
+        if token is None:
+            return None
+
+        prefix = content[:idx]
+        suffix = content[idx + len(token):]
+        value = token_value(token)
         if not value:
             return ""
 
         if not allow_path_separators:
             value = value.replace("/", "_")
-        # Sanitize the value
         value = sanitize_filename(value)
-
         return f"{prefix}{value}{suffix}"
 
-    # Replace all tokens
-    result = TOKEN_PATTERN.sub(replace_token, template)
+    # Process brace blocks in order so we can support conditional literal blocks like:
+    # { - Part }{PartNumber}
+    matches = list(BRACE_PATTERN.finditer(template))
+    if not matches:
+        result = template
+    else:
+        parts: list[str] = []
+        cursor = 0
+        for idx, match in enumerate(matches):
+            parts.append(template[cursor:match.start()])
+            content = match.group(1)
+            rendered = render_block(content)
+
+            if rendered is not None:
+                parts.append(rendered)
+            else:
+                conditional_literal = False
+                include_literal = False
+                if idx + 1 < len(matches) and match.end() == matches[idx + 1].start():
+                    next_content = matches[idx + 1].group(1)
+                    next_token, _next_idx = find_token(next_content)
+                    if next_token is not None:
+                        conditional_literal = True
+                        include_literal = bool(token_value(next_token))
+                if include_literal:
+                    parts.append(content)
+                elif not conditional_literal:
+                    # Preserve blocks that look like literal text, but treat bare unknown
+                    # placeholders as missing variables.
+                    if re.search(r"\s", content):
+                        parts.append(match.group(0))
+
+            cursor = match.end()
+
+        parts.append(template[cursor:])
+        result = "".join(parts)
 
     # Clean up any double slashes that might result from empty tokens
     result = re.sub(r'/+', '/', result)

shelfmark/core/notifications.py

@@ -0,0 +1,613 @@
+"""Apprise notification dispatch for global and per-user events."""
+
+from __future__ import annotations
+
+import logging
+import threading
+from concurrent.futures import ThreadPoolExecutor
+from contextlib import contextmanager
+from dataclasses import dataclass
+from enum import Enum
+from typing import Any, Iterable, Iterator
+from urllib.parse import urlsplit
+
+try:
+    import apprise
+except Exception:  # pragma: no cover - exercised in tests via monkeypatch
+    apprise = None  # type: ignore[assignment]
+
+from shelfmark.core.config import config as app_config
+from shelfmark.core.logger import setup_logger
+
+logger = setup_logger(__name__)
+
+# Small pool for non-blocking dispatch. Notification sends are I/O bound and infrequent.
+_executor = ThreadPoolExecutor(max_workers=2, thread_name_prefix="Notify")
+_ROUTE_EVENT_ALL = "all"
+_APPRISE_APP_ID = "Shelfmark"
+_APPRISE_APP_DESC = "Shelfmark notifications"
+_APPRISE_LOGO_URL = (
+    "https://raw.githubusercontent.com/calibrain/shelfmark/main/src/frontend/public/logo.png"
+)
+_APPRISE_LOGGER_NAME = "apprise"
+
+
+class NotificationEvent(str, Enum):
+    """Global notification event identifiers."""
+
+    REQUEST_CREATED = "request_created"
+    REQUEST_FULFILLED = "request_fulfilled"
+    REQUEST_REJECTED = "request_rejected"
+    DOWNLOAD_COMPLETE = "download_complete"
+    DOWNLOAD_FAILED = "download_failed"
+
+
+@dataclass
+class NotificationContext:
+    """Context used to render notification templates."""
+
+    event: NotificationEvent
+    title: str
+    author: str
+    username: str | None = None
+    content_type: str | None = None
+    format: str | None = None
+    source: str | None = None
+    admin_note: str | None = None
+    error_message: str | None = None
+
+
+def _normalize_urls(value: Any) -> list[str]:
+    if value is None:
+        return []
+
+    raw_values: list[Any]
+    if isinstance(value, list):
+        raw_values = value
+    elif isinstance(value, str):
+        # Support legacy/manual configs.
+        raw_values = [segment for part in value.splitlines() for segment in part.split(",")]
+    else:
+        raw_values = [value]
+
+    normalized: list[str] = []
+    seen: set[str] = set()
+    for raw_url in raw_values:
+        url = str(raw_url or "").strip()
+        if not url:
+            continue
+        # Strip invisible/non-ASCII characters that can sneak in via copy-paste
+        # (zero-width spaces, smart quotes, non-breaking spaces, etc.).
+        # These pass Apprise URL validation but cause UnicodeEncodeError when
+        # requests tries to latin-1 encode credentials for Basic Auth headers.
+        url = url.encode("ascii", errors="ignore").decode("ascii").strip()
+        if not url:
+            continue
+        if url in seen:
+            continue
+        seen.add(url)
+        normalized.append(url)
+    return normalized
+
+
+def _extract_url_schemes(urls: Iterable[str]) -> list[str]:
+    schemes: list[str] = []
+    seen: set[str] = set()
+    for raw_url in urls:
+        scheme = urlsplit(str(raw_url or "")).scheme.lower()
+        if not scheme or scheme in seen:
+            continue
+        seen.add(scheme)
+        schemes.append(scheme)
+    return schemes
+
+
+class _AppriseLogCapture(logging.Handler):
+    def __init__(self, *, thread_id: int):
+        super().__init__(level=logging.INFO)
+        self.records: list[tuple[int, str, str, str]] = []
+        self._thread_id = thread_id
+
+    def emit(self, record: logging.LogRecord) -> None:
+        if record.thread != self._thread_id:
+            return
+
+        message = record.getMessage()
+        if message:
+            exception_summary = ""
+            if record.exc_info and record.exc_info[0]:
+                exc_type = getattr(record.exc_info[0], "__name__", "Exception")
+                exc = record.exc_info[1]
+                exception_summary = f"{exc_type}: {exc}"
+            elif record.exc_text:
+                exception_summary = str(record.exc_text).strip()
+
+            self.records.append((record.levelno, record.name, str(message), exception_summary))
+
+
+@contextmanager
+def _capture_apprise_logs(*, min_level: int = logging.INFO) -> Iterator[list[tuple[int, str, str, str]]]:
+    apprise_logger = logging.getLogger(_APPRISE_LOGGER_NAME)
+    previous_level = apprise_logger.level
+    handler = _AppriseLogCapture(thread_id=threading.get_ident())
+    apprise_logger.addHandler(handler)
+
+    if previous_level == logging.NOTSET or previous_level > min_level:
+        apprise_logger.setLevel(min_level)
+
+    try:
+        yield handler.records
+    finally:
+        apprise_logger.removeHandler(handler)
+        apprise_logger.setLevel(previous_level)
+
+
+def _log_apprise_records(records: Iterable[tuple[int, str, str, str]]) -> None:
+    seen: set[tuple[int, str, str, str]] = set()
+    for level, source, raw_message, raw_exception_summary in records:
+        message = str(raw_message or "").strip()
+        source_name = str(source or "").strip() or _APPRISE_LOGGER_NAME
+        exception_summary = str(raw_exception_summary or "").strip()
+        key = (int(level), source_name, message, exception_summary)
+        if not message or key in seen:
+            continue
+        seen.add(key)
+
+        full_message = message if not exception_summary else f"{message} ({exception_summary})"
+
+        if level >= logging.ERROR:
+            logger.error("Apprise source [%s]: %s", source_name, full_message)
+        elif level >= logging.WARNING:
+            logger.warning("Apprise source [%s]: %s", source_name, full_message)
+        else:
+            logger.info("Apprise source [%s]: %s", source_name, full_message)
+
+
+def _log_apprise_exception_debug(*, action: str, scheme: str, exc: Exception) -> None:
+    logger.debug(
+        "Apprise %s raised %s for scheme '%s': %s",
+        action,
+        type(exc).__name__,
+        scheme,
+        exc,
+        exc_info=True,
+    )
+
+
+def _build_apprise_warning_detail(
+    records: Iterable[tuple[int, str, str, str]],
+    *,
+    scheme: str,
+) -> str | None:
+    for level, source, raw_message, raw_exception_summary in records:
+        if level < logging.WARNING:
+            continue
+
+        message = str(raw_message or "").strip()
+        if not message:
+            continue
+
+        source_name = str(source or "").strip()
+        exception_summary = str(raw_exception_summary or "").strip()
+        full_message = message if not exception_summary else f"{message} ({exception_summary})"
+
+        if source_name and source_name != _APPRISE_LOGGER_NAME:
+            return f"{scheme}: {source_name}: {full_message}"
+        return f"{scheme}: {full_message}"
+    return None
+
+
+def _normalize_routes(value: Any) -> list[dict[str, str]]:
+    if not isinstance(value, list):
+        return []
+
+    allowed_events = {_ROUTE_EVENT_ALL, *(event.value for event in NotificationEvent)}
+    normalized: list[dict[str, str]] = []
+    seen: set[tuple[str, str]] = set()
+
+    for row in value:
+        if not isinstance(row, dict):
+            continue
+
+        raw_events = row.get("event")
+        if isinstance(raw_events, list):
+            event_values = raw_events
+        elif isinstance(raw_events, (tuple, set)):
+            event_values = list(raw_events)
+        else:
+            event_values = [raw_events]
+
+        url = str(row.get("url") or "").strip()
+        if not url:
+            continue
+
+        row_events: list[str] = []
+        for raw_event in event_values:
+            event = str(raw_event or "").strip().lower()
+            if event not in allowed_events:
+                continue
+            if event in row_events:
+                continue
+            row_events.append(event)
+
+        if _ROUTE_EVENT_ALL in row_events:
+            row_events = [_ROUTE_EVENT_ALL]
+
+        for event in row_events:
+            key = (event, url)
+            if key in seen:
+                continue
+            seen.add(key)
+
+            normalized.append({"event": event, "url": url})
+
+    return normalized
+
+
+def _resolve_admin_routes() -> list[dict[str, str]]:
+    return _normalize_routes(app_config.get("ADMIN_NOTIFICATION_ROUTES", []))
+
+
+def _normalize_user_id(value: Any) -> int | None:
+    try:
+        user_id = int(value)
+    except (TypeError, ValueError):
+        return None
+    if user_id < 1:
+        return None
+    return user_id
+
+
+def _resolve_user_routes(user_id: int | None) -> list[dict[str, str]]:
+    normalized_user_id = _normalize_user_id(user_id)
+    if normalized_user_id is None:
+        return []
+
+    return _normalize_routes(
+        app_config.get("USER_NOTIFICATION_ROUTES", [], user_id=normalized_user_id)
+    )
+
+
+def _resolve_route_urls_for_event(
+    routes: list[dict[str, str]],
+    event: NotificationEvent,
+) -> list[str]:
+    selected: list[str] = []
+    seen: set[str] = set()
+    event_value = event.value
+
+    for row in routes:
+        row_event = row.get("event", "")
+        if row_event not in {_ROUTE_EVENT_ALL, event_value}:
+            continue
+
+        url = row.get("url", "")
+        if not url or url in seen:
+            continue
+
+        seen.add(url)
+        selected.append(url)
+
+    return selected
+
+
+def _resolve_notify_type(event: NotificationEvent) -> Any:
+    if apprise is None:
+        fallback = {
+            NotificationEvent.REQUEST_CREATED: "info",
+            NotificationEvent.REQUEST_FULFILLED: "success",
+            NotificationEvent.REQUEST_REJECTED: "warning",
+            NotificationEvent.DOWNLOAD_COMPLETE: "success",
+            NotificationEvent.DOWNLOAD_FAILED: "failure",
+        }
+        return fallback[event]
+
+    mapping = {
+        NotificationEvent.REQUEST_CREATED: apprise.NotifyType.INFO,
+        NotificationEvent.REQUEST_FULFILLED: apprise.NotifyType.SUCCESS,
+        NotificationEvent.REQUEST_REJECTED: apprise.NotifyType.WARNING,
+        NotificationEvent.DOWNLOAD_COMPLETE: apprise.NotifyType.SUCCESS,
+        NotificationEvent.DOWNLOAD_FAILED: apprise.NotifyType.FAILURE,
+    }
+    return mapping[event]
+
+
+def _clean_text(value: Any, fallback: str) -> str:
+    text = str(value or "").strip()
+    return text or fallback
+
+
+def _render_message(context: NotificationContext) -> tuple[str, str]:
+    event = context.event
+    title = _clean_text(context.title, "Unknown title")
+    author = _clean_text(context.author, "Unknown author")
+    username = _clean_text(context.username, "A user")
+
+    if event == NotificationEvent.REQUEST_CREATED:
+        return "New Request", f'{username} requested "{title}" by {author}'
+    if event == NotificationEvent.REQUEST_FULFILLED:
+        return "Request Approved", f'Request for "{title}" by {author} was approved.'
+    if event == NotificationEvent.REQUEST_REJECTED:
+        note = _clean_text(context.admin_note, "")
+        note_line = f"\nNote: {note}" if note else ""
+        return "Request Rejected", f'Request for "{title}" by {author} was rejected.{note_line}'
+    if event == NotificationEvent.DOWNLOAD_COMPLETE:
+        return "Download Complete", f'"{title}" by {author} downloaded successfully.'
+
+    error_message = _clean_text(context.error_message, "")
+    error_line = f"\nError: {error_message}" if error_message else ""
+    return "Download Failed", f'Failed to download "{title}" by {author}.{error_line}'
+
+
+def _plugin_label(plugin: Any, fallback_scheme: str) -> str:
+    """Build a human-readable label from a validated Apprise plugin.
+
+    Combines the URL scheme with the plugin's service name (app_id) and
+    privacy-safe URL for richer diagnostics, e.g.
+    ``"slack (Slack - slack://TokenA/To...n/To...n/)"``
+    """
+    parts: list[str] = [fallback_scheme]
+
+    app_id = getattr(plugin, "app_id", None)
+    if app_id and str(app_id) != fallback_scheme:
+        privacy_url: str | None = None
+        try:
+            privacy_url = plugin.url(privacy=True)
+        except Exception:
+            pass
+
+        suffix = str(app_id)
+        if privacy_url:
+            suffix = f"{suffix} - {privacy_url}"
+        parts.append(f"({suffix})")
+
+    return " ".join(parts)
+
+
+def _dispatch_to_apprise(
+    urls: Iterable[str],
+    *,
+    title: str,
+    body: str,
+    notify_type: Any,
+) -> dict[str, Any]:
+    normalized_urls = _normalize_urls(list(urls))
+    url_schemes = _extract_url_schemes(normalized_urls)
+    if not normalized_urls:
+        return {"success": False, "message": "No notification URLs configured"}
+
+    if apprise is None:
+        return {"success": False, "message": "Apprise is not installed"}
+
+    valid_urls = 0
+    invalid_urls = 0
+    delivered_urls = 0
+    failed_delivery_urls = 0
+    failure_details: list[str] = []
+
+    for url in normalized_urls:
+        scheme = urlsplit(url).scheme or "unknown"
+        apobj = _create_apprise_client()
+        if apobj is None:
+            return {"success": False, "message": "Apprise is not installed"}
+
+        registration_failure_detail: str | None = None
+        with _capture_apprise_logs(min_level=logging.INFO) as apprise_records:
+            try:
+                plugin = apprise.Apprise.instantiate(url, asset=getattr(apobj, "asset", None))
+            except Exception as exc:
+                logger.warning(
+                    "Failed to register notification route URL for scheme '%s': %s",
+                    scheme,
+                    exc,
+                )
+                _log_apprise_exception_debug(
+                    action="route registration",
+                    scheme=scheme,
+                    exc=exc,
+                )
+                registration_failure_detail = (
+                    f"{scheme}: route registration failed ({type(exc).__name__}: {exc})"
+                )
+                failure_details.append(registration_failure_detail)
+                plugin = None
+
+            if plugin is None:
+                invalid_urls += 1
+                logger.warning("Apprise rejected notification route URL for scheme '%s'", scheme)
+                _log_apprise_records(apprise_records)
+                warning_detail = _build_apprise_warning_detail(apprise_records, scheme=scheme)
+                if warning_detail:
+                    failure_details.append(warning_detail)
+                elif registration_failure_detail is None:
+                    failure_details.append(f"{scheme}: route URL rejected by Apprise")
+                continue
+
+            plugin_label = _plugin_label(plugin, scheme)
+            apobj.add(plugin)
+            valid_urls += 1
+
+            try:
+                delivered = bool(apobj.notify(title=title, body=body, notify_type=notify_type))
+            except Exception as exc:
+                _log_apprise_records(apprise_records)
+                failed_delivery_urls += 1
+                logger.warning(
+                    "Apprise notify raised %s for %s: %s",
+                    type(exc).__name__,
+                    plugin_label,
+                    exc,
+                )
+                _log_apprise_exception_debug(action="notify", scheme=scheme, exc=exc)
+                warning_detail = _build_apprise_warning_detail(apprise_records, scheme=scheme)
+                if warning_detail:
+                    failure_details.append(warning_detail)
+                else:
+                    failure_details.append(
+                        f"{scheme}: notify raised {type(exc).__name__}: {exc}"
+                    )
+                continue
+
+        _log_apprise_records(apprise_records)
+        if delivered:
+            delivered_urls += 1
+            logger.debug("Notification delivered via %s", plugin_label)
+            continue
+
+        failed_delivery_urls += 1
+        logger.warning("Apprise notify returned False for %s", plugin_label)
+        warning_detail = _build_apprise_warning_detail(apprise_records, scheme=scheme)
+        if warning_detail:
+            failure_details.append(warning_detail)
+        else:
+            failure_details.append(f"{scheme}: delivery failed")
+
+    scheme_summary = ", ".join(url_schemes) if url_schemes else "unknown"
+    if valid_urls == 0:
+        logger.warning(
+            "No valid Apprise notification routes after registration for scheme(s): %s",
+            scheme_summary,
+        )
+        result: dict[str, Any] = {
+            "success": False,
+            "message": "No valid notification URLs configured",
+        }
+        if failure_details:
+            result["details"] = failure_details
+        return result
+
+    if delivered_urls == 0:
+        logger.warning(
+            (
+                "Apprise notify returned False for scheme(s): %s "
+                "(valid_urls=%s invalid_urls=%s failed_deliveries=%s)"
+            ),
+            scheme_summary,
+            valid_urls,
+            invalid_urls,
+            failed_delivery_urls,
+        )
+        result = {"success": False, "message": "Notification delivery failed"}
+        if failure_details:
+            result["details"] = failure_details
+        return result
+
+    message = f"Notification sent to {delivered_urls} URL(s)"
+    failed_urls = invalid_urls + failed_delivery_urls
+    if failed_urls:
+        message += f" ({failed_urls} URL(s) failed)"
+    result = {"success": True, "message": message}
+    if failure_details:
+        result["details"] = failure_details
+    return result
+
+
+def _create_apprise_client() -> Any:
+    if apprise is None:
+        return None
+
+    apprise_cls = getattr(apprise, "Apprise", None)
+    if apprise_cls is None:
+        return None
+
+    apprise_asset_cls = getattr(apprise, "AppriseAsset", None)
+    if apprise_asset_cls is None:
+        return apprise_cls()
+
+    try:
+        asset = apprise_asset_cls(
+            app_id=_APPRISE_APP_ID,
+            app_desc=_APPRISE_APP_DESC,
+            image_url_logo=_APPRISE_LOGO_URL,
+        )
+    except TypeError:
+        # Support older Apprise versions that do not expose image_url_logo.
+        asset = apprise_asset_cls(
+            app_id=_APPRISE_APP_ID,
+            app_desc=_APPRISE_APP_DESC,
+        )
+    except Exception:
+        return apprise_cls()
+
+    try:
+        return apprise_cls(asset=asset)
+    except Exception:
+        return apprise_cls()
+
+
+def _send_admin_event(event: NotificationEvent, context: NotificationContext, urls: list[str]) -> dict[str, Any]:
+    title, body = _render_message(context)
+    notify_type = _resolve_notify_type(event)
+    return _dispatch_to_apprise(urls, title=title, body=body, notify_type=notify_type)
+
+
+def notify_admin(event: NotificationEvent, context: NotificationContext) -> None:
+    """Send a global admin notification for an event if subscribed."""
+    routes = _resolve_admin_routes()
+    urls = _resolve_route_urls_for_event(routes, event)
+    if not urls:
+        return
+
+    try:
+        _executor.submit(_dispatch_admin_async, event, context, urls)
+    except Exception as exc:
+        logger.warning("Failed to queue admin notification '%s': %s", event.value, exc)
+
+
+def notify_user(user_id: int | None, event: NotificationEvent, context: NotificationContext) -> None:
+    """Send a per-user notification for an event if subscribed."""
+    normalized_user_id = _normalize_user_id(user_id)
+    if normalized_user_id is None:
+        return
+
+    routes = _resolve_user_routes(normalized_user_id)
+    urls = _resolve_route_urls_for_event(routes, event)
+    if not urls:
+        return
+
+    try:
+        _executor.submit(_dispatch_user_async, normalized_user_id, event, context, urls)
+    except Exception as exc:
+        logger.warning(
+            "Failed to queue user notification '%s' for user_id=%s: %s",
+            event.value,
+            normalized_user_id,
+            exc,
+        )
+
+
+def _dispatch_admin_async(event: NotificationEvent, context: NotificationContext, urls: list[str]) -> None:
+    result = _send_admin_event(event, context, urls)
+    if not result.get("success", False):
+        logger.warning("Admin notification failed for event '%s': %s", event.value, result.get("message"))
+
+
+def _dispatch_user_async(
+    user_id: int,
+    event: NotificationEvent,
+    context: NotificationContext,
+    urls: list[str],
+) -> None:
+    result = _send_admin_event(event, context, urls)
+    if not result.get("success", False):
+        logger.warning(
+            "User notification failed for event '%s' (user_id=%s): %s",
+            event.value,
+            user_id,
+            result.get("message"),
+        )
+
+
+def send_test_notification(urls: list[str]) -> dict[str, Any]:
+    """Send a synchronous test notification to the provided URLs."""
+    normalized_urls = _normalize_urls(urls)
+    if not normalized_urls:
+        return {"success": False, "message": "No notification URLs configured"}
+
+    test_context = NotificationContext(
+        event=NotificationEvent.REQUEST_CREATED,
+        title="Shelfmark Test Notification",
+        author="Shelfmark",
+        username="Shelfmark",
+    )
+    return _send_admin_event(NotificationEvent.REQUEST_CREATED, test_context, normalized_urls)

shelfmark/core/oidc_auth.py

@@ -0,0 +1,80 @@
+"""OIDC authentication helpers.
+
+Handles group claim parsing, user info extraction, and user provisioning.
+Flask route handlers are registered separately in main.py.
+"""
+
+from typing import Any, Dict, List, Optional
+
+from shelfmark.core.external_user_linking import upsert_external_user
+from shelfmark.core.user_db import UserDB
+
+def parse_group_claims(id_token: Dict[str, Any], group_claim: str) -> List[str]:
+    """Extract group list from an ID token claim.
+
+    Supports list, comma-separated string, or pipe-separated string.
+    Returns empty list if claim is missing.
+    """
+    raw = id_token.get(group_claim)
+    if raw is None:
+        return []
+    if isinstance(raw, list):
+        return [str(g).strip() for g in raw if str(g).strip()]
+    if isinstance(raw, str):
+        delimiter = "," if "," in raw else "|"
+        return [g.strip() for g in raw.split(delimiter) if g.strip()]
+    return []
+
+
+def extract_user_info(id_token: Dict[str, Any]) -> Dict[str, Any]:
+    """Extract user info from OIDC ID token claims.
+
+    Returns a dict with keys: oidc_subject, username, email, display_name.
+    Falls back through preferred_username -> email -> sub for username.
+    """
+    sub = id_token.get("sub", "")
+    email = id_token.get("email")
+    display_name = id_token.get("name")
+    username = id_token.get("preferred_username") or email or sub
+
+    return {
+        "oidc_subject": sub,
+        "username": username,
+        "email": email,
+        "display_name": display_name,
+    }
+
+
+def provision_oidc_user(
+    db: UserDB,
+    user_info: Dict[str, Any],
+    is_admin: Optional[bool] = None,
+    allow_email_link: bool = False,
+    allow_create: bool = True,
+) -> Optional[Dict[str, Any]]:
+    """Create or update a user from OIDC claims.
+
+    Matching and collision handling use the shared external user linker:
+    - OIDC subject first
+    - optionally unique email linking (when `allow_email_link=True`)
+    - username conflict resolution via numeric suffix.
+
+    Returns None when no existing user is matchable and `allow_create=False`.
+    """
+    oidc_subject = user_info["oidc_subject"]
+    user, _ = upsert_external_user(
+        db,
+        auth_source="oidc",
+        username=user_info["username"] or oidc_subject,
+        role="admin" if is_admin else "user",
+        email=user_info.get("email"),
+        display_name=user_info.get("display_name"),
+        subject_field="oidc_subject",
+        subject=oidc_subject,
+        allow_email_link=allow_email_link,
+        sync_role=is_admin is not None,
+        allow_create=allow_create,
+        collision_strategy="suffix",
+        context="oidc_login",
+    )
+    return user

shelfmark/core/oidc_routes.py

@@ -0,0 +1,223 @@
+"""OIDC Flask route handlers using Authlib.
+
+Registers /api/auth/oidc/login and /api/auth/oidc/callback endpoints.
+Business logic remains in oidc_auth.py.
+"""
+
+from typing import Any
+from urllib.parse import quote
+
+from authlib.jose.errors import InvalidClaimError
+from authlib.integrations.flask_client import OAuth
+from flask import Flask, jsonify, redirect, request, session
+
+from shelfmark.core.logger import setup_logger
+from shelfmark.core.oidc_auth import (
+    extract_user_info,
+    parse_group_claims,
+    provision_oidc_user,
+)
+from shelfmark.core.settings_registry import load_config_file
+from shelfmark.core.user_db import UserDB
+from shelfmark.download.network import get_ssl_verify
+
+logger = setup_logger(__name__)
+oauth = OAuth()
+
+
+def _normalize_claims(raw_claims: Any) -> dict[str, Any]:
+    """Return a plain dict for claims from Authlib token/userinfo payloads."""
+    if raw_claims is None:
+        return {}
+    if isinstance(raw_claims, dict):
+        return raw_claims
+    if hasattr(raw_claims, "to_dict"):
+        return raw_claims.to_dict()  # type: ignore[no-any-return]
+    try:
+        return dict(raw_claims)
+    except Exception:
+        return {}
+
+
+def _has_username_or_email(claims: dict[str, Any]) -> bool:
+    """Return True when claims include a usable username or email."""
+    for key in ("preferred_username", "email"):
+        value = claims.get(key)
+        if isinstance(value, str) and value.strip():
+            return True
+    return False
+
+
+def _login_error_url(message: str) -> str:
+    """Build a login URL (with script_root) that includes an OIDC error message."""
+    script_root = request.script_root.rstrip("/")
+    login_url = f"{script_root}/login" if script_root else "/login"
+    return f"{login_url}?oidc_error={quote(message)}"
+
+
+def _get_oidc_client() -> tuple[Any, dict[str, Any]]:
+    """Register and return an OIDC client from the current security config."""
+    config = load_config_file("security")
+    discovery_url = config.get("OIDC_DISCOVERY_URL", "")
+    client_id = config.get("OIDC_CLIENT_ID", "")
+
+    if not discovery_url or not client_id:
+        raise ValueError("OIDC not configured")
+
+    configured_scopes = config.get("OIDC_SCOPES", ["openid", "email", "profile"])
+    if isinstance(configured_scopes, list):
+        scope_values = [str(scope).strip() for scope in configured_scopes if str(scope).strip()]
+    elif isinstance(configured_scopes, str):
+        delimiter = "," if "," in configured_scopes else " "
+        scope_values = [scope.strip() for scope in configured_scopes.split(delimiter) if scope.strip()]
+    else:
+        scope_values = []
+
+    scopes = list(dict.fromkeys(["openid"] + scope_values))
+
+    admin_group = config.get("OIDC_ADMIN_GROUP", "")
+    group_claim = config.get("OIDC_GROUP_CLAIM", "groups")
+    use_admin_group = config.get("OIDC_USE_ADMIN_GROUP", True)
+    if admin_group and use_admin_group and group_claim and group_claim not in scopes:
+        scopes.append(group_claim)
+
+    def _ssl_compliance_fix(session, **kwargs):
+        """Set session.verify based on the Certificate Validation setting."""
+        session.verify = get_ssl_verify(discovery_url)
+        return session
+
+    oauth._clients.pop("shelfmark_idp", None)
+    oauth.register(
+        name="shelfmark_idp",
+        client_id=client_id,
+        client_secret=config.get("OIDC_CLIENT_SECRET", ""),
+        server_metadata_url=discovery_url,
+        client_kwargs={
+            "scope": " ".join(scopes),
+            "code_challenge_method": "S256",
+        },
+        compliance_fix=_ssl_compliance_fix,
+        overwrite=True,
+    )
+
+    client = oauth.create_client("shelfmark_idp")
+    if client is None:
+        raise RuntimeError("OIDC client initialization failed")
+
+    return client, config
+
+
+def register_oidc_routes(app: Flask, user_db: UserDB) -> None:
+    """Register OIDC authentication routes on the Flask app."""
+    oauth.init_app(app)
+
+    @app.route("/api/auth/oidc/login", methods=["GET"])
+    def oidc_login():
+        """Initiate OIDC login flow and redirect to the provider."""
+        try:
+            client, _ = _get_oidc_client()
+            redirect_uri = request.url_root.rstrip("/") + "/api/auth/oidc/callback"
+            return client.authorize_redirect(redirect_uri)
+        except ValueError:
+            return jsonify({"error": "OIDC not configured"}), 500
+        except Exception as e:
+            logger.error(f"OIDC login error: {e}")
+            return jsonify({"error": "OIDC login failed"}), 500
+
+    @app.route("/api/auth/oidc/callback", methods=["GET"])
+    def oidc_callback():
+        """Handle OIDC callback from identity provider."""
+        try:
+            error = request.args.get("error")
+            if error:
+                logger.warning(f"OIDC callback error from IdP: {error}")
+                return redirect(_login_error_url("Authentication failed"))
+
+            client, config = _get_oidc_client()
+            try:
+                token = client.authorize_access_token()
+            except InvalidClaimError as e:
+                claim_name = getattr(e, "claim_name", "unknown")
+                discovery_url = str(config.get("OIDC_DISCOVERY_URL", ""))
+                provider_issuer = ""
+                try:
+                    metadata = client.load_server_metadata()
+                    if isinstance(metadata, dict):
+                        provider_issuer = str(metadata.get("issuer", ""))
+                except Exception as metadata_error:
+                    logger.debug(f"OIDC metadata lookup failed during claim diagnostics: {metadata_error}")
+
+                logger.error(
+                    "OIDC callback claim validation failed: claim=%s error=%s discovery_url=%s provider_issuer=%s",
+                    claim_name,
+                    e,
+                    discovery_url or "<unset>",
+                    provider_issuer or "<unknown>",
+                )
+                if claim_name == "iss":
+                    msg = (
+                        "OIDC issuer validation failed. Verify your discovery URL and IdP issuer/"
+                        "external URL configuration."
+                    )
+                    return redirect(_login_error_url(msg))
+
+                return redirect(_login_error_url(f"OIDC token claim validation failed: {claim_name}"))
+            claims = _normalize_claims(token.get("userinfo"))
+
+            # If userinfo is missing or claims are too sparse, request it explicitly.
+            if not claims or not _has_username_or_email(claims):
+                fetched_claims: dict[str, Any] = {}
+                try:
+                    fetched_claims = _normalize_claims(client.userinfo(token=token))
+                except TypeError:
+                    fetched_claims = _normalize_claims(client.userinfo())
+                except Exception as e:
+                    logger.error(f"Failed to fetch OIDC userinfo: {e}")
+                if fetched_claims:
+                    claims = {**claims, **fetched_claims}
+
+            if not claims:
+                msg = "OIDC authentication failed: missing user claims"
+                logger.error(msg)
+                return redirect(_login_error_url(msg))
+
+            group_claim = config.get("OIDC_GROUP_CLAIM", "groups")
+            admin_group = config.get("OIDC_ADMIN_GROUP", "")
+            use_admin_group = config.get("OIDC_USE_ADMIN_GROUP", True)
+            auto_provision = config.get("OIDC_AUTO_PROVISION", True)
+
+            user_info = extract_user_info(claims)
+            groups = parse_group_claims(claims, group_claim)
+
+            is_admin = None
+            if admin_group and use_admin_group:
+                is_admin = admin_group in groups
+
+            allow_email_link = bool(user_info.get("email"))
+            user = provision_oidc_user(
+                user_db,
+                user_info,
+                is_admin=is_admin,
+                allow_email_link=allow_email_link,
+                allow_create=bool(auto_provision),
+            )
+            if user is None:
+                logger.warning(
+                    f"OIDC login rejected: auto-provision disabled for {user_info['username']}"
+                )
+                return redirect(_login_error_url("Account not found. Contact your administrator."))
+
+            session["user_id"] = user["username"]
+            session["is_admin"] = user.get("role") == "admin"
+            session["db_user_id"] = user["id"]
+            session.permanent = True
+
+            logger.info(f"OIDC login successful: {user['username']} (admin={is_admin})")
+            return redirect(request.script_root or "/")
+
+        except ValueError as e:
+            logger.error(f"OIDC callback error: {e}")
+            return redirect(_login_error_url(str(e)))
+        except Exception as e:
+            logger.error(f"OIDC callback error: {e}")
+            return redirect(_login_error_url("Authentication failed"))

shelfmark/core/onboarding.py

@@ -34,6 +34,12 @@ def _get_config_dir() -> Path:
 
 def is_onboarding_complete() -> bool:
     """Check if onboarding has been completed."""
+    from shelfmark.config.env import ONBOARDING
+
+    # If onboarding is disabled via env var, treat as complete
+    if not ONBOARDING:
+        return True
+
     config_file = _get_config_dir() / "settings.json"
     if not config_file.exists():
         return False

shelfmark/core/queue.py

@@ -5,10 +5,13 @@ import time
 from datetime import datetime, timedelta
 from pathlib import Path
 from threading import Lock, Event
-from typing import Dict, List, Optional, Tuple, Any
+from typing import Dict, List, Optional, Tuple, Any, Callable
 
 from shelfmark.core.config import config as app_config
-from shelfmark.core.models import QueueStatus, QueueItem, DownloadTask
+from shelfmark.core.logger import setup_logger
+from shelfmark.core.models import QueueStatus, QueueItem, DownloadTask, TERMINAL_QUEUE_STATUSES
+
+logger = setup_logger(__name__)
 
 
 class BookQueue:
@@ -22,6 +25,10 @@ class BookQueue:
         self._status_timestamps: dict[str, datetime] = {}  # Track when each status was last updated
         self._cancel_flags: dict[str, Event] = {}  # Cancellation flags for active downloads
         self._active_downloads: dict[str, bool] = {}  # Track currently downloading tasks
+        self._terminal_status_hook: Optional[
+            Callable[[str, QueueStatus, DownloadTask], None]
+        ] = None
+        self._queue_hook: Optional[Callable[[str, DownloadTask], None]] = None
 
     @property
     def _status_timeout(self) -> timedelta:
@@ -30,11 +37,12 @@ class BookQueue:
 
     def add(self, task: DownloadTask) -> bool:
         """Add a download task to the queue. Returns False if already exists."""
+        hook: Optional[Callable[[str, DownloadTask], None]] = None
         with self._lock:
             task_id = task.task_id
 
-            # Don't add if already exists and not in error/done state
-            if task_id in self._status and self._status[task_id] not in [QueueStatus.ERROR, QueueStatus.DONE, QueueStatus.CANCELLED]:
+            # Don't add if already exists and not in error/cancelled state
+            if task_id in self._status and self._status[task_id] not in [QueueStatus.ERROR, QueueStatus.CANCELLED]:
                 return False
 
             # Ensure added_time is set
@@ -45,7 +53,14 @@ class BookQueue:
             self._queue.put(queue_item)
             self._task_data[task_id] = task
             self._update_status(task_id, QueueStatus.QUEUED)
-            return True
+            hook = self._queue_hook
+
+        if hook is not None:
+            try:
+                hook(task_id, task)
+            except Exception as exc:
+                logger.warning("Queue hook failed while adding task %s: %s", task_id, exc)
+        return True
 
     def get_next(self) -> Optional[Tuple[str, Event]]:
         """Get next task ID from queue with cancellation flag."""
@@ -74,21 +89,58 @@ class BookQueue:
         with self._lock:
             return self._task_data.get(task_id)
 
+    def get_task_status(self, task_id: str) -> Optional[QueueStatus]:
+        """Get queue status for a task id."""
+        with self._lock:
+            return self._status.get(task_id)
+
     def _update_status(self, book_id: str, status: QueueStatus) -> None:
         """Internal method to update status and timestamp."""
         self._status[book_id] = status
         self._status_timestamps[book_id] = datetime.now()
 
+    def set_terminal_status_hook(
+        self,
+        hook: Optional[Callable[[str, QueueStatus, DownloadTask], None]],
+    ) -> None:
+        """Register a callback invoked when a task first enters a terminal status."""
+        with self._lock:
+            self._terminal_status_hook = hook
+
+    def set_queue_hook(
+        self,
+        hook: Optional[Callable[[str, DownloadTask], None]],
+    ) -> None:
+        """Register a callback invoked when a task is added to the queue."""
+        with self._lock:
+            self._queue_hook = hook
+
     def update_status(self, book_id: str, status: QueueStatus) -> None:
         """Update status of a book in the queue."""
+        hook: Optional[Callable[[str, QueueStatus, DownloadTask], None]] = None
+        hook_task: Optional[DownloadTask] = None
         with self._lock:
+            previous_status = self._status.get(book_id)
             self._update_status(book_id, status)
 
+            if (
+                status in TERMINAL_QUEUE_STATUSES
+                and previous_status != status
+                and self._terminal_status_hook is not None
+            ):
+                current_task = self._task_data.get(book_id)
+                if current_task is not None:
+                    hook = self._terminal_status_hook
+                    hook_task = current_task
+
             # Clean up active download tracking when finished
-            if status in [QueueStatus.COMPLETE, QueueStatus.AVAILABLE, QueueStatus.ERROR, QueueStatus.DONE, QueueStatus.CANCELLED]:
+            if status in TERMINAL_QUEUE_STATUSES:
                 self._active_downloads.pop(book_id, None)
                 self._cancel_flags.pop(book_id, None)
 
+        if hook is not None and hook_task is not None:
+            hook(book_id, status, hook_task)
+
     def update_download_path(self, task_id: str, download_path: str) -> None:
         """Update the download path of a task in the queue."""
         with self._lock:
@@ -107,14 +159,22 @@ class BookQueue:
             if task_id in self._task_data:
                 self._task_data[task_id].status_message = message
 
-    def get_status(self) -> Dict[QueueStatus, Dict[str, DownloadTask]]:
-        """Get current queue status grouped by status."""
+    def get_status(self, user_id: Optional[int] = None) -> Dict[QueueStatus, Dict[str, DownloadTask]]:
+        """Get current queue status grouped by status.
+
+        Args:
+            user_id: If provided, only return tasks belonging to this user.
+                     If None, return all.
+        """
         self.refresh()
         with self._lock:
             result: Dict[QueueStatus, Dict[str, DownloadTask]] = {status: {} for status in QueueStatus}
             for task_id, status in self._status.items():
                 if task_id in self._task_data:
-                    result[status][task_id] = self._task_data[task_id]
+                    task = self._task_data[task_id]
+                    if user_id is not None and task.user_id != user_id:
+                        continue
+                    result[status][task_id] = task
             return result
 
     def get_queue_order(self) -> List[Dict[str, Any]]:
@@ -149,31 +209,20 @@ class BookQueue:
             return sorted(queue_items, key=lambda x: (x['priority'], x['added_time']))
 
     def cancel_download(self, task_id: str) -> bool:
-        """Cancel a download or clear a completed/errored item."""
+        """Cancel an active or queued download."""
         with self._lock:
             current_status = self._status.get(task_id)
 
-            # Allow cancellation during any active state
-            if current_status in [QueueStatus.RESOLVING, QueueStatus.DOWNLOADING]:
+            if current_status in [QueueStatus.RESOLVING, QueueStatus.LOCATING, QueueStatus.DOWNLOADING]:
                 # Signal active download to stop
                 if task_id in self._cancel_flags:
                     self._cancel_flags[task_id].set()
-                self._update_status(task_id, QueueStatus.CANCELLED)
-                return True
-            elif current_status == QueueStatus.QUEUED:
-                # Remove from queue and mark as cancelled
-                self._update_status(task_id, QueueStatus.CANCELLED)
-                return True
-            elif current_status in [QueueStatus.COMPLETE, QueueStatus.DONE, QueueStatus.AVAILABLE, QueueStatus.ERROR, QueueStatus.CANCELLED]:
-                # Clear completed/errored/cancelled items from tracking
-                self._status.pop(task_id, None)
-                self._status_timestamps.pop(task_id, None)
-                self._task_data.pop(task_id, None)
-                self._cancel_flags.pop(task_id, None)
-                self._active_downloads.pop(task_id, None)
-                return True
+            elif current_status not in [QueueStatus.QUEUED]:
+                # Not in a cancellable state
+                return False
 
-            return False
+        self.update_status(task_id, QueueStatus.CANCELLED)
+        return True
 
     def set_priority(self, task_id: str, new_priority: int) -> bool:
         """Change the priority of a queued task (lower = higher priority)."""
@@ -207,6 +256,51 @@ class BookQueue:
 
             return found
 
+    def enqueue_existing(self, task_id: str, *, priority: Optional[int] = None) -> bool:
+        """Requeue an existing task regardless of current status.
+
+        This is used for retries where task metadata should be preserved.
+        """
+        hook: Optional[Callable[[str, DownloadTask], None]] = None
+        hook_task: Optional[DownloadTask] = None
+        with self._lock:
+            task = self._task_data.get(task_id)
+            if task is None:
+                return False
+
+            if priority is not None:
+                task.priority = priority
+
+            # Ensure task doesn't appear active while waiting for retry.
+            self._active_downloads.pop(task_id, None)
+            self._cancel_flags.pop(task_id, None)
+
+            # De-duplicate queue entries for this task id.
+            temp_items: list[QueueItem] = []
+            while not self._queue.empty():
+                try:
+                    item = self._queue.get_nowait()
+                except queue.Empty:
+                    break
+                if item.book_id != task_id:
+                    temp_items.append(item)
+
+            for item in temp_items:
+                self._queue.put(item)
+
+            queue_item = QueueItem(task_id, task.priority, time.time())
+            self._queue.put(queue_item)
+            self._update_status(task_id, QueueStatus.QUEUED)
+            hook = self._queue_hook
+            hook_task = task
+
+        if hook is not None and hook_task is not None:
+            try:
+                hook(task_id, hook_task)
+            except Exception as exc:
+                logger.warning("Queue hook failed while requeueing task %s: %s", task_id, exc)
+        return True
+
     def reorder_queue(self, task_priorities: Dict[str, int]) -> bool:
         """Bulk reorder queue by mapping task_id to new priority."""
         with self._lock:
@@ -245,24 +339,9 @@ class BookQueue:
                 return True
             return any(status == QueueStatus.QUEUED for status in self._status.values())
 
-    def clear_completed(self) -> int:
-        """Remove all completed, errored, or cancelled tasks from tracking."""
-        terminal_statuses = {QueueStatus.COMPLETE, QueueStatus.DONE, QueueStatus.AVAILABLE, QueueStatus.ERROR, QueueStatus.CANCELLED}
-        with self._lock:
-            to_remove = [task_id for task_id, status in self._status.items() if status in terminal_statuses]
-
-            for task_id in to_remove:
-                self._status.pop(task_id, None)
-                self._status_timestamps.pop(task_id, None)
-                self._task_data.pop(task_id, None)
-                self._cancel_flags.pop(task_id, None)
-                self._active_downloads.pop(task_id, None)
-
-            return len(to_remove)
-
     def refresh(self) -> None:
         """Remove any tasks that are done downloading or have stale status."""
-        terminal_statuses = {QueueStatus.COMPLETE, QueueStatus.DONE, QueueStatus.ERROR, QueueStatus.AVAILABLE, QueueStatus.CANCELLED}
+        terminal_statuses = TERMINAL_QUEUE_STATUSES
         with self._lock:
             current_time = datetime.now()
             to_remove = []
@@ -276,10 +355,6 @@ class BookQueue:
                 if task.download_path and not Path(task.download_path).exists():
                     task.download_path = None
 
-                # Mark available downloads as done if file is gone
-                if status == QueueStatus.AVAILABLE and not task.download_path:
-                    self._update_status(task_id, QueueStatus.DONE)
-
                 # Check for stale status entries
                 last_update = self._status_timestamps.get(task_id)
                 if last_update and (current_time - last_update) > self._status_timeout:

shelfmark/core/request_helpers.py

@@ -0,0 +1,129 @@
+"""Shared request-related helper functions used by routes and services."""
+
+from __future__ import annotations
+
+from datetime import datetime, timezone
+from typing import Any
+
+from shelfmark.core.logger import setup_logger
+from shelfmark.core.settings_registry import load_config_file
+
+_logger = setup_logger(__name__)
+
+
+def now_utc_iso() -> str:
+    """Return the current UTC time as a seconds-precision ISO 8601 string."""
+    return datetime.now(timezone.utc).isoformat(timespec="seconds")
+
+
+def emit_ws_event(
+    ws_manager: Any,
+    *,
+    event_name: str,
+    payload: dict[str, Any],
+    room: str,
+) -> None:
+    """Emit a WebSocket event via the shared manager, swallowing failures."""
+    if ws_manager is None:
+        return
+    try:
+        socketio = getattr(ws_manager, "socketio", None)
+        is_enabled = getattr(ws_manager, "is_enabled", None)
+        if socketio is None or not callable(is_enabled) or not is_enabled():
+            return
+        socketio.emit(event_name, payload, to=room)
+    except Exception as exc:
+        _logger.warning("Failed to emit WebSocket event '%s' to room '%s': %s", event_name, room, exc)
+
+
+def load_users_request_policy_settings() -> dict[str, Any]:
+    """Load global request-policy settings from the users config file."""
+    return load_config_file("users")
+
+
+def coerce_bool(value: Any, default: bool = False) -> bool:
+    """Coerce arbitrary values into booleans with string-friendly semantics."""
+    if isinstance(value, bool):
+        return value
+    if value is None:
+        return default
+    if isinstance(value, str):
+        normalized = value.strip().lower()
+        if normalized in {"1", "true", "yes", "on"}:
+            return True
+        if normalized in {"0", "false", "no", "off", ""}:
+            return False
+    return bool(value)
+
+
+def get_session_db_user_id(session_obj: Any) -> int | None:
+    """Extract and coerce `db_user_id` from a Flask session to ``int | None``."""
+    raw = session_obj.get("db_user_id") if session_obj is not None else None
+    try:
+        return int(raw) if raw is not None else None
+    except (TypeError, ValueError):
+        return None
+
+
+def coerce_int(value: Any, default: int) -> int:
+    """Best-effort integer coercion with fallback to default."""
+    try:
+        return int(value)
+    except (TypeError, ValueError):
+        return default
+
+
+def normalize_optional_text(value: Any) -> str | None:
+    """Return a trimmed string or None for empty/non-string input."""
+    if not isinstance(value, str):
+        return None
+    normalized = value.strip()
+    return normalized or None
+
+
+def normalize_positive_int(value: Any) -> int | None:
+    """Parse *value* as a positive integer, returning ``None`` on failure."""
+    try:
+        parsed = int(value)
+    except (TypeError, ValueError):
+        return None
+    return parsed if parsed > 0 else None
+
+
+def normalize_optional_positive_int(value: Any, field_name: str = "value") -> int | None:
+    """Parse *value* as a positive integer or ``None``.
+
+    Raises ``ValueError`` when *value* is present but not a valid
+    positive integer.
+    """
+    if value is None:
+        return None
+    try:
+        parsed = int(value)
+    except (TypeError, ValueError) as exc:
+        raise ValueError(f"{field_name} must be a positive integer when provided") from exc
+    if parsed < 1:
+        raise ValueError(f"{field_name} must be a positive integer when provided")
+    return parsed
+
+
+def populate_request_usernames(rows: list[dict[str, Any]], user_db: Any) -> None:
+    """Add 'username' to each request row by looking up user_id."""
+    cache: dict[int, str] = {}
+    for row in rows:
+        requester_id = row["user_id"]
+        if requester_id not in cache:
+            requester = user_db.get_user(user_id=requester_id)
+            cache[requester_id] = requester.get("username", "") if requester else ""
+        row["username"] = cache[requester_id]
+
+
+def extract_release_source_id(release_data: Any) -> str | None:
+    """Extract and normalize release_data.source_id."""
+    if not isinstance(release_data, dict):
+        return None
+    source_id = release_data.get("source_id")
+    if not isinstance(source_id, str):
+        return None
+    normalized = source_id.strip()
+    return normalized or None

shelfmark/core/request_policy.py

@@ -0,0 +1,373 @@
+"""Request-policy resolution helpers.
+
+This module is intentionally pure and side-effect free so it can be reused by
+routes/services and tested independently.
+"""
+
+from __future__ import annotations
+
+from enum import Enum
+from typing import Any, Iterable, Mapping, Sequence
+
+
+class PolicyMode(str, Enum):
+    """Allowed request-policy modes.
+
+    Ordered from most to least permissive. The content-type default acts as a
+    ceiling — matrix rules can only match or restrict further, never upgrade
+    beyond the default.
+    """
+
+    DOWNLOAD = "download"
+    REQUEST_RELEASE = "request_release"
+    REQUEST_BOOK = "request_book"
+    BLOCKED = "blocked"
+
+
+# Permissiveness ordering: lower index = more permissive.
+_MODE_PERMISSIVENESS: dict[PolicyMode, int] = {
+    PolicyMode.DOWNLOAD: 0,
+    PolicyMode.REQUEST_RELEASE: 1,
+    PolicyMode.REQUEST_BOOK: 2,
+    PolicyMode.BLOCKED: 3,
+}
+
+# Modes allowed in REQUEST_POLICY_RULES matrix rows.
+MATRIX_ALLOWED_MODES = frozenset({PolicyMode.DOWNLOAD, PolicyMode.REQUEST_RELEASE, PolicyMode.BLOCKED})
+
+
+def cap_mode(mode: PolicyMode, ceiling: PolicyMode) -> PolicyMode:
+    """Cap a resolved mode so it cannot be more permissive than the ceiling."""
+    if _MODE_PERMISSIVENESS[mode] < _MODE_PERMISSIVENESS[ceiling]:
+        return ceiling
+    return mode
+
+
+def _source_results_are_releases(source: Any) -> bool:
+    normalized_source = normalize_source(source)
+    if normalized_source in {"", "*"}:
+        return False
+    from shelfmark.release_sources import source_results_are_releases
+    return source_results_are_releases(normalized_source)
+
+
+def _normalize_release_result_mode(source: Any, mode: PolicyMode) -> PolicyMode:
+    """Concrete release browse results cannot fall back to request_book semantics."""
+    if mode == PolicyMode.REQUEST_BOOK and _source_results_are_releases(source):
+        return PolicyMode.REQUEST_RELEASE
+    return mode
+
+
+REQUEST_POLICY_KEYS = frozenset(
+    {
+        "REQUESTS_ENABLED",
+        "REQUEST_POLICY_DEFAULT_EBOOK",
+        "REQUEST_POLICY_DEFAULT_AUDIOBOOK",
+        "REQUEST_POLICY_RULES",
+        "MAX_PENDING_REQUESTS_PER_USER",
+        "REQUESTS_ALLOW_NOTES",
+    }
+)
+
+REQUEST_POLICY_DEFAULT_FALLBACK_MODE = PolicyMode.REQUEST_BOOK
+
+DEFAULT_SUPPORTED_CONTENT_TYPES = ("ebook", "audiobook")
+
+
+def filter_request_policy_settings(settings: Mapping[str, Any] | None) -> dict[str, Any]:
+    """Return only uppercase request-policy keys from a settings JSON object."""
+    if not isinstance(settings, Mapping):
+        return {}
+    return {key: settings[key] for key in REQUEST_POLICY_KEYS if key in settings}
+
+
+def merge_request_policy_settings(
+    global_settings: Mapping[str, Any] | None,
+    user_settings: Mapping[str, Any] | None = None,
+) -> dict[str, Any]:
+    """Merge global settings with per-user request-policy overrides."""
+    merged = filter_request_policy_settings(global_settings)
+    user_filtered = filter_request_policy_settings(user_settings)
+
+    # Preserve global rules by default and treat user rules as per-cell overlays.
+    # This allows per-user REQUEST_POLICY_RULES payloads to store only explicit
+    # differences instead of replacing the full global matrix.
+    global_rules = list(_iter_rules(merged.get("REQUEST_POLICY_RULES", [])))
+    user_has_rules = "REQUEST_POLICY_RULES" in user_filtered
+
+    for key, value in user_filtered.items():
+        if key == "REQUEST_POLICY_RULES":
+            continue
+        merged[key] = value
+
+    if user_has_rules:
+        merged_rules: dict[tuple[str, str], tuple[str, str, PolicyMode]] = {
+            (source, content_type): (source, content_type, mode)
+            for source, content_type, mode in global_rules
+        }
+        for source, content_type, mode in _iter_rules(user_filtered.get("REQUEST_POLICY_RULES", [])):
+            merged_rules[(source, content_type)] = (source, content_type, mode)
+        merged["REQUEST_POLICY_RULES"] = [
+            {"source": source, "content_type": content_type, "mode": mode.value}
+            for source, content_type, mode in merged_rules.values()
+        ]
+
+    return merged
+
+
+def normalize_content_type(content_type: Any) -> str:
+    """Normalize arbitrary content type values to `ebook` or `audiobook`."""
+    if not isinstance(content_type, str):
+        return "ebook"
+
+    value = content_type.strip().lower()
+    if not value:
+        return "ebook"
+
+    if value in {"audiobook", "audiobooks", "audio", "book (audiobook)"}:
+        return "audiobook"
+
+    return "ebook"
+
+
+def normalize_source(source: Any) -> str:
+    """Normalize source values for policy matching."""
+    if not isinstance(source, str):
+        return "*"
+
+    value = source.strip().lower()
+    return value or "*"
+
+
+def parse_policy_mode(mode: Any) -> PolicyMode | None:
+    """Parse an arbitrary mode value into a PolicyMode enum member."""
+    if isinstance(mode, PolicyMode):
+        return mode
+    if not isinstance(mode, str):
+        return None
+    try:
+        return PolicyMode(mode.strip().lower())
+    except ValueError:
+        return None
+
+
+def _normalize_rule_content_type(content_type: Any) -> str | None:
+    if not isinstance(content_type, str):
+        return None
+    value = content_type.strip().lower()
+    if not value:
+        return None
+    if value in {"*", "any"}:
+        return "*"
+    if value in {"ebook", "book", "books", "book (fiction)"}:
+        return "ebook"
+    if value in {"audiobook", "audiobooks", "audio", "book (audiobook)"}:
+        return "audiobook"
+    return None
+
+
+def _normalize_rule_source(source: Any) -> str | None:
+    if not isinstance(source, str):
+        return None
+    value = source.strip().lower()
+    if not value:
+        return None
+    if value in {"*", "any"}:
+        return "*"
+    return value
+
+
+def get_source_content_type_capabilities() -> dict[str, set[str]]:
+    """Return source -> supported content type map from registered sources."""
+    try:
+        from shelfmark.release_sources import list_available_sources
+    except Exception:
+        return {}
+
+    capabilities: dict[str, set[str]] = {}
+    for source in list_available_sources():
+        raw_name = source.get("name")
+        name = normalize_source(raw_name)
+        if not name or name == "*":
+            continue
+
+        raw_types = source.get("supported_content_types", DEFAULT_SUPPORTED_CONTENT_TYPES)
+        if isinstance(raw_types, str) or not isinstance(raw_types, Sequence):
+            raw_types = DEFAULT_SUPPORTED_CONTENT_TYPES
+
+        normalized_types: set[str] = set()
+        for content_type in raw_types:
+            normalized_type = _normalize_rule_content_type(content_type)
+            if normalized_type and normalized_type != "*":
+                normalized_types.add(normalized_type)
+
+        if not normalized_types:
+            normalized_types = set(DEFAULT_SUPPORTED_CONTENT_TYPES)
+        capabilities[name] = normalized_types
+    return capabilities
+
+
+def validate_policy_rules(
+    rules: Any,
+    source_capabilities: Mapping[str, set[str]] | None = None,
+) -> tuple[list[dict[str, str]], list[str]]:
+    """Validate and normalize policy rule rows.
+
+    Validation covers:
+    - row shape and required keys
+    - valid mode/content_type values
+    - known source names
+    - source/content-type compatibility from source declarations
+    """
+    capabilities = source_capabilities if source_capabilities is not None else get_source_content_type_capabilities()
+    normalized_capabilities = {
+        normalize_source(source): {normalize_content_type(content_type) for content_type in content_types}
+        for source, content_types in capabilities.items()
+    }
+
+    normalized_rules: list[dict[str, str]] = []
+    errors: list[str] = []
+
+    if rules is None:
+        return normalized_rules, errors
+    if not isinstance(rules, list):
+        return normalized_rules, ["REQUEST_POLICY_RULES must be a list"]
+
+    for index, rule in enumerate(rules):
+        row_label = f"Rule {index + 1}"
+        if not isinstance(rule, Mapping):
+            errors.append(f"{row_label}: must be an object")
+            continue
+
+        source = _normalize_rule_source(rule.get("source"))
+        raw_content_type = rule.get("content_type")
+        content_type = _normalize_rule_content_type(rule.get("content_type"))
+        raw_mode = rule.get("mode")
+        mode = parse_policy_mode(rule.get("mode"))
+
+        if source is None:
+            errors.append(f"{row_label}: source is required")
+            continue
+        if (
+            raw_content_type is None
+            or (isinstance(raw_content_type, str) and not raw_content_type.strip())
+        ):
+            errors.append(f"{row_label}: content_type is required")
+            continue
+        if content_type is None:
+            errors.append(f"{row_label}: invalid content_type '{rule.get('content_type')}'")
+            continue
+        if (
+            raw_mode is None
+            or (isinstance(raw_mode, str) and not raw_mode.strip())
+        ):
+            errors.append(f"{row_label}: mode is required")
+            continue
+        if mode is None:
+            errors.append(f"{row_label}: invalid mode '{rule.get('mode')}'")
+            continue
+        if mode not in MATRIX_ALLOWED_MODES:
+            errors.append(f"{row_label}: mode '{mode.value}' is not allowed in matrix rules (use content-type defaults instead)")
+            continue
+
+        if source != "*" and source not in normalized_capabilities:
+            errors.append(f"{row_label}: unknown source '{source}'")
+            continue
+
+        if (
+            source != "*"
+            and content_type != "*"
+            and source in normalized_capabilities
+            and content_type not in normalized_capabilities[source]
+        ):
+            errors.append(
+                f"{row_label}: source '{source}' does not support content_type '{content_type}'"
+            )
+            continue
+
+        normalized_rules.append(
+            {
+                "source": source,
+                "content_type": content_type,
+                "mode": mode.value,
+            }
+        )
+
+    return normalized_rules, errors
+
+
+def _iter_rules(rules: Any) -> Iterable[tuple[str, str, PolicyMode]]:
+    if not isinstance(rules, list):
+        return []
+
+    normalized: list[tuple[str, str, PolicyMode]] = []
+    for rule in rules:
+        if not isinstance(rule, Mapping):
+            continue
+        source = _normalize_rule_source(rule.get("source"))
+        content_type = _normalize_rule_content_type(rule.get("content_type"))
+        mode = parse_policy_mode(rule.get("mode"))
+        if (
+            source is None
+            or content_type is None
+            or mode is None
+            or mode not in MATRIX_ALLOWED_MODES
+        ):
+            continue
+        normalized.append((source, content_type, mode))
+    return normalized
+
+
+def resolve_policy_mode(
+    *,
+    source: Any,
+    content_type: Any,
+    global_settings: Mapping[str, Any] | None,
+    user_settings: Mapping[str, Any] | None = None,
+) -> PolicyMode:
+    """Resolve an effective policy mode for a request context.
+
+    Resolution:
+    1. Resolve the content-type default (ceiling).
+    2. Match rules in specificity order.
+    3. Cap the matched rule at the ceiling.
+    4. If no rule matches, return the ceiling.
+
+    The content-type default acts as a ceiling — matrix rules can only
+    match or restrict further, never upgrade beyond the default.
+
+    Concrete-release browse exception:
+    - sources whose browse results are already concrete releases normalize
+      request_book to request_release.
+    """
+
+    effective = merge_request_policy_settings(global_settings, user_settings)
+    normalized_source = normalize_source(source)
+    normalized_content_type = normalize_content_type(content_type)
+
+    # Resolve the content-type default (ceiling)
+    default_key = (
+        "REQUEST_POLICY_DEFAULT_AUDIOBOOK"
+        if normalized_content_type == "audiobook"
+        else "REQUEST_POLICY_DEFAULT_EBOOK"
+    )
+    default_mode = parse_policy_mode(effective.get(default_key))
+    ceiling = default_mode if default_mode is not None else REQUEST_POLICY_DEFAULT_FALLBACK_MODE
+
+    # Match rules in specificity order
+    rules = tuple(_iter_rules(effective.get("REQUEST_POLICY_RULES", [])))
+    candidates = (
+        (normalized_source, normalized_content_type),
+        (normalized_source, "*"),
+        ("*", normalized_content_type),
+        ("*", "*"),
+    )
+    for candidate_source, candidate_content_type in candidates:
+        for rule_source, rule_content_type, rule_mode in rules:
+            if rule_source == candidate_source and rule_content_type == candidate_content_type:
+                return _normalize_release_result_mode(
+                    normalized_source,
+                    cap_mode(rule_mode, ceiling),
+                )
+
+    return _normalize_release_result_mode(normalized_source, ceiling)

shelfmark/core/request_routes.py

@@ -0,0 +1,776 @@
+"""Request API routes and policy snapshot endpoint."""
+
+from __future__ import annotations
+
+from typing import Any, Callable
+
+from flask import Flask, jsonify, request, session
+
+from shelfmark.core.logger import setup_logger
+from shelfmark.core.request_policy import (
+    PolicyMode,
+    REQUEST_POLICY_DEFAULT_FALLBACK_MODE,
+    get_source_content_type_capabilities,
+    merge_request_policy_settings,
+    normalize_content_type,
+    normalize_source,
+    parse_policy_mode,
+    resolve_policy_mode,
+)
+from shelfmark.core.request_validation import RequestStatus
+from shelfmark.core.requests_service import (
+    RequestServiceError,
+    cancel_request,
+    create_request,
+    fulfil_request,
+    reject_request,
+)
+from shelfmark.core.notifications import (
+    NotificationContext,
+    NotificationEvent,
+    notify_admin,
+    notify_user,
+)
+from shelfmark.core.request_helpers import (
+    coerce_bool,
+    coerce_int,
+    emit_ws_event,
+    load_users_request_policy_settings,
+    normalize_optional_text,
+    normalize_positive_int,
+    populate_request_usernames,
+)
+from shelfmark.core.user_db import UserDB
+
+logger = setup_logger(__name__)
+
+
+def _error_response(
+    message: str,
+    status_code: int,
+    *,
+    code: str | None = None,
+    required_mode: str | None = None,
+):
+    payload: dict[str, Any] = {"error": message}
+    if code is not None:
+        payload["code"] = code
+    if required_mode is not None:
+        payload["required_mode"] = required_mode
+    return jsonify(payload), status_code
+
+
+def _require_request_endpoints_available(resolve_auth_mode: Callable[[], str]):
+    auth_mode = resolve_auth_mode()
+    if auth_mode == "none":
+        return _error_response(
+            "Request workflow is unavailable in no-auth mode",
+            403,
+            code="requests_unavailable",
+        )
+    if "user_id" not in session:
+        return jsonify({"error": "Unauthorized"}), 401
+    return None
+
+
+def _require_db_user_id() -> tuple[int | None, Any | None]:
+    raw_user_id = session.get("db_user_id")
+    if raw_user_id is None:
+        return None, _error_response(
+            "User identity is unavailable for request workflow",
+            403,
+            code="user_identity_unavailable",
+        )
+    try:
+        return int(raw_user_id), None
+    except (TypeError, ValueError):
+        return None, _error_response(
+            "User identity is unavailable for request workflow",
+            403,
+            code="user_identity_unavailable",
+        )
+
+
+def _require_admin_user_id() -> tuple[int | None, Any | None]:
+    if not session.get("is_admin", False):
+        return None, (jsonify({"error": "Admin access required"}), 403)
+    raw_admin_id = session.get("db_user_id")
+    if raw_admin_id is None:
+        return None, (jsonify({"error": "Admin user identity unavailable"}), 403)
+    try:
+        return int(raw_admin_id), None
+    except (TypeError, ValueError):
+        return None, (jsonify({"error": "Admin user identity unavailable"}), 403)
+
+
+def _resolve_effective_policy(
+    user_db: UserDB,
+    *,
+    db_user_id: int | None,
+) -> tuple[dict[str, Any], dict[str, Any], dict[str, Any], bool]:
+    global_settings = load_users_request_policy_settings()
+    user_settings = user_db.get_user_settings(db_user_id) if db_user_id is not None else {}
+    effective = merge_request_policy_settings(global_settings, user_settings)
+    requests_enabled = coerce_bool(effective.get("REQUESTS_ENABLED"), False)
+    return global_settings, user_settings, effective, requests_enabled
+
+
+def _resolve_title_from_book_data(book_data: Any) -> str:
+    if isinstance(book_data, dict):
+        title = normalize_optional_text(book_data.get("title"))
+        if title is not None:
+            return title
+    return "Unknown title"
+
+
+def _normalize_optional_source_id(value: Any) -> str | None:
+    """Normalize source identifiers while allowing integer provider ids."""
+    if isinstance(value, bool) or value is None:
+        return None
+    if isinstance(value, int):
+        value = str(value)
+    return normalize_optional_text(value)
+
+
+def _build_release_result_data_from_book_data(
+    *,
+    source: str,
+    book_data: dict[str, Any],
+    content_type: str,
+) -> dict[str, Any]:
+    """Build release-level payload fields for sources whose browse results are releases."""
+    source_id = _normalize_optional_source_id(book_data.get("provider_id")) or _normalize_optional_source_id(
+        book_data.get("id")
+    )
+    payload: dict[str, Any] = {
+        "source": source,
+        "source_id": source_id,
+        "title": book_data.get("title"),
+        "author": book_data.get("author"),
+        "year": book_data.get("year"),
+        "format": book_data.get("format"),
+        "size": book_data.get("size"),
+        "preview": book_data.get("preview"),
+        "content_type": content_type,
+        "source_url": book_data.get("source_url"),
+        "search_mode": "direct",
+    }
+    return {key: value for key, value in payload.items() if value is not None}
+
+
+def _source_results_are_releases(source: str) -> bool:
+    normalized_source = normalize_source(source)
+    if normalized_source in {"", "*"}:
+        return False
+    from shelfmark.release_sources import source_results_are_releases
+    return source_results_are_releases(normalized_source)
+
+
+def _normalize_release_result_request_payload(
+    *,
+    source: str,
+    request_level: Any,
+    book_data: Any,
+    release_data: Any,
+    content_type: str,
+) -> tuple[Any, Any]:
+    """Concrete-release browse results are always handled as release-level requests."""
+    if not _source_results_are_releases(source):
+        return request_level, release_data
+
+    normalized_release_data = release_data
+    if normalized_release_data is None and isinstance(book_data, dict):
+        normalized_release_data = _build_release_result_data_from_book_data(
+            source=source,
+            book_data=book_data,
+            content_type=content_type,
+        )
+    elif isinstance(normalized_release_data, dict):
+        normalized_release_data = dict(normalized_release_data)
+
+    if isinstance(normalized_release_data, dict):
+        normalized_release_data["source"] = source
+        if normalized_release_data.get("content_type") is None:
+            normalized_release_data["content_type"] = content_type
+
+        normalized_source_id = _normalize_optional_source_id(normalized_release_data.get("source_id"))
+        if normalized_source_id is not None:
+            normalized_release_data["source_id"] = normalized_source_id
+        elif isinstance(book_data, dict):
+            fallback_source_id = _normalize_optional_source_id(book_data.get("provider_id")) or _normalize_optional_source_id(
+                book_data.get("id")
+            )
+            if fallback_source_id is not None:
+                normalized_release_data["source_id"] = fallback_source_id
+
+    return "release", normalized_release_data
+
+
+def _resolve_request_title(request_row: dict[str, Any]) -> str:
+    return _resolve_title_from_book_data(request_row.get("book_data"))
+
+
+def _format_user_label(username: str | None, user_id: int | None = None) -> str:
+    normalized_username = normalize_optional_text(username)
+    if normalized_username is not None:
+        return normalized_username
+    if user_id is not None and user_id > 0:
+        return f"user#{user_id}"
+    return "unknown user"
+
+
+def _format_requester_label(user_db: UserDB, request_row: dict[str, Any]) -> str:
+    """Resolve a display label for the user who created a request."""
+    user_id = normalize_positive_int(request_row.get("user_id"))
+    if user_id is not None:
+        requester = user_db.get_user(user_id=user_id)
+        if isinstance(requester, dict):
+            username = normalize_optional_text(requester.get("username"))
+            if username is not None:
+                return username
+    return _format_user_label(None, user_id)
+
+
+def _resolve_request_source_and_format(request_row: dict[str, Any]) -> tuple[str, str | None]:
+    release_data = request_row.get("release_data")
+    if isinstance(release_data, dict):
+        source = normalize_source(release_data.get("source") or request_row.get("source_hint"))
+        release_format = normalize_optional_text(
+            release_data.get("format")
+            or release_data.get("filetype")
+            or release_data.get("extension")
+        )
+        return source, release_format
+    return normalize_source(request_row.get("source_hint")), None
+
+
+
+
+def _notify_admin_for_request_event(
+    user_db: UserDB,
+    *,
+    event: NotificationEvent,
+    request_row: dict[str, Any],
+) -> None:
+    book_data = request_row.get("book_data")
+    if not isinstance(book_data, dict):
+        book_data = {}
+
+    source, release_format = _resolve_request_source_and_format(request_row)
+    context = NotificationContext(
+        event=event,
+        title=str(book_data.get("title") or "Unknown title"),
+        author=str(book_data.get("author") or "Unknown author"),
+        username=_format_requester_label(user_db, request_row),
+        content_type=normalize_content_type(
+            request_row.get("content_type") or book_data.get("content_type")
+        ),
+        format=release_format,
+        source=source,
+        admin_note=normalize_optional_text(request_row.get("admin_note")),
+        error_message=None,
+    )
+
+    owner_user_id = normalize_positive_int(request_row.get("user_id"))
+    try:
+        notify_admin(event, context)
+    except Exception as exc:
+        logger.warning(
+            "Failed to trigger admin notification for request event '%s': %s",
+            event.value,
+            exc,
+        )
+    if owner_user_id is None:
+        return
+    try:
+        notify_user(owner_user_id, event, context)
+    except Exception as exc:
+        logger.warning(
+            "Failed to trigger user notification for request event '%s' (user_id=%s): %s",
+            event.value,
+            owner_user_id,
+            exc,
+        )
+
+
+def register_request_routes(
+    app: Flask,
+    user_db: UserDB,
+    *,
+    resolve_auth_mode: Callable[[], str],
+    queue_release: Callable[..., tuple[bool, str | None]],
+    ws_manager: Any | None = None,
+) -> None:
+    """Register request policy and request lifecycle routes."""
+
+    @app.route("/api/request-policy", methods=["GET"])
+    def api_request_policy():
+        auth_gate = _require_request_endpoints_available(resolve_auth_mode)
+        if auth_gate is not None:
+            return auth_gate
+
+        is_admin = bool(session.get("is_admin", False))
+        db_user_id: int | None = None
+        if not is_admin:
+            db_user_id, db_gate = _require_db_user_id()
+            if db_gate is not None:
+                return db_gate
+        else:
+            raw_id = session.get("db_user_id")
+            if raw_id is not None:
+                try:
+                    db_user_id = int(raw_id)
+                except (TypeError, ValueError):
+                    db_user_id = None
+
+        global_settings, user_settings, effective, requests_enabled = _resolve_effective_policy(
+            user_db,
+            db_user_id=db_user_id,
+        )
+
+        default_ebook_mode = parse_policy_mode(effective.get("REQUEST_POLICY_DEFAULT_EBOOK"))
+        default_audio_mode = parse_policy_mode(effective.get("REQUEST_POLICY_DEFAULT_AUDIOBOOK"))
+
+        source_capabilities = get_source_content_type_capabilities()
+        from shelfmark.release_sources import source_results_are_releases
+        source_modes = []
+        for source_name in sorted(source_capabilities):
+            supported_types = sorted(
+                source_capabilities[source_name],
+                key=lambda ct: (ct != "ebook", ct),
+            )
+            modes = {
+                content_type: resolve_policy_mode(
+                    source=source_name,
+                    content_type=content_type,
+                    global_settings=global_settings,
+                    user_settings=user_settings,
+                ).value
+                for content_type in supported_types
+            }
+            source_modes.append(
+                {
+                    "source": source_name,
+                    "supported_content_types": supported_types,
+                    "browse_results_are_releases": source_results_are_releases(source_name),
+                    "modes": modes,
+                }
+            )
+
+        return jsonify(
+            {
+                "requests_enabled": requests_enabled,
+                "is_admin": is_admin,
+                "allow_notes": coerce_bool(effective.get("REQUESTS_ALLOW_NOTES"), default=True),
+                "defaults": {
+                    "ebook": (
+                        default_ebook_mode.value
+                        if default_ebook_mode is not None
+                        else REQUEST_POLICY_DEFAULT_FALLBACK_MODE.value
+                    ),
+                    "audiobook": (
+                        default_audio_mode.value
+                        if default_audio_mode is not None
+                        else REQUEST_POLICY_DEFAULT_FALLBACK_MODE.value
+                    ),
+                },
+                "rules": effective.get("REQUEST_POLICY_RULES", []),
+                "source_modes": source_modes,
+            }
+        )
+
+    @app.route("/api/requests", methods=["POST"])
+    def api_create_request():
+        auth_gate = _require_request_endpoints_available(resolve_auth_mode)
+        if auth_gate is not None:
+            return auth_gate
+
+        db_user_id, db_gate = _require_db_user_id()
+        if db_gate is not None or db_user_id is None:
+            return db_gate
+        actor_username = normalize_optional_text(session.get("user_id"))
+        actor_label = _format_user_label(actor_username, db_user_id)
+
+        data = request.get_json(silent=True)
+        if not isinstance(data, dict):
+            return jsonify({"error": "No data provided"}), 400
+
+        context = data.get("context") or {}
+        if not isinstance(context, dict):
+            return jsonify({"error": "context must be an object"}), 400
+
+        source = normalize_source(context.get("source"))
+        release_data = data.get("release_data")
+        request_level = context.get("request_level")
+        if request_level is None:
+            request_level = "book" if release_data is None else "release"
+
+        book_data = data.get("book_data")
+        if not isinstance(book_data, dict):
+            return jsonify({"error": "book_data must be an object"}), 400
+        request_title = _resolve_title_from_book_data(book_data)
+
+        content_type = normalize_content_type(
+            context.get("content_type")
+            or data.get("content_type")
+            or book_data.get("content_type")
+        )
+        request_level, release_data = _normalize_release_result_request_payload(
+            source=source,
+            request_level=request_level,
+            book_data=book_data,
+            release_data=release_data,
+            content_type=content_type,
+        )
+
+        global_settings, user_settings, effective, requests_enabled = _resolve_effective_policy(
+            user_db,
+            db_user_id=db_user_id,
+        )
+        if not requests_enabled:
+            logger.debug(
+                "Request not created for '%s' by %s: requests are disabled",
+                request_title,
+                actor_label,
+            )
+            return _error_response(
+                "Request workflow is disabled by policy",
+                403,
+                code="requests_unavailable",
+            )
+
+        max_pending = coerce_int(
+            effective.get("MAX_PENDING_REQUESTS_PER_USER"),
+            default=20,
+        )
+        if max_pending < 1:
+            max_pending = 1
+        if max_pending > 1000:
+            max_pending = 1000
+        allow_notes = coerce_bool(effective.get("REQUESTS_ALLOW_NOTES"), default=True)
+        note_value = data.get("note") if allow_notes else None
+
+        resolved_mode = resolve_policy_mode(
+            source=source,
+            content_type=content_type,
+            global_settings=global_settings,
+            user_settings=user_settings,
+        )
+        logger.debug(
+            "request create policy user=%s db_user_id=%s source=%s content_type=%s request_level=%s resolved_mode=%s",
+            session.get("user_id"),
+            db_user_id,
+            source,
+            content_type,
+            request_level,
+            resolved_mode.value,
+        )
+
+        if resolved_mode == PolicyMode.BLOCKED:
+            logger.debug(
+                "Request blocked by policy for '%s' by %s",
+                request_title,
+                actor_label,
+            )
+            return _error_response(
+                "Requesting is blocked by policy",
+                403,
+                code="policy_blocked",
+                required_mode=PolicyMode.BLOCKED.value,
+            )
+
+        if resolved_mode == PolicyMode.REQUEST_BOOK:
+            requested_level = str(request_level).strip().lower() if isinstance(request_level, str) else ""
+            if requested_level != "book":
+                logger.debug(
+                    "Request not created for '%s' by %s: policy requires book-level requests",
+                    request_title,
+                    actor_label,
+                )
+                return _error_response(
+                    "Policy requires book-level requests",
+                    403,
+                    code="policy_requires_request",
+                    required_mode=PolicyMode.REQUEST_BOOK.value,
+                )
+
+        try:
+            created = create_request(
+                user_db,
+                user_id=db_user_id,
+                source_hint=source,
+                content_type=content_type,
+                request_level=request_level,
+                policy_mode=resolved_mode.value,
+                book_data=book_data,
+                release_data=release_data,
+                note=note_value,
+                max_pending_per_user=max_pending,
+            )
+        except RequestServiceError as exc:
+            return _error_response(str(exc), exc.status_code, code=exc.code)
+
+        event_payload = {
+            "request_id": created["id"],
+            "status": created["status"],
+            "title": _resolve_request_title(created),
+        }
+        logger.info(
+            "Request created #%s for '%s' by %s",
+            created["id"],
+            event_payload["title"],
+            actor_label,
+        )
+        emit_ws_event(
+            ws_manager,
+            event_name="new_request",
+            payload=event_payload,
+            room="admins",
+        )
+        emit_ws_event(
+            ws_manager,
+            event_name="request_update",
+            payload=event_payload,
+            room=f"user_{db_user_id}",
+        )
+
+        _notify_admin_for_request_event(
+            user_db,
+            event=NotificationEvent.REQUEST_CREATED,
+            request_row=created,
+        )
+
+        return jsonify(created), 201
+
+    @app.route("/api/requests", methods=["GET"])
+    def api_list_requests():
+        auth_gate = _require_request_endpoints_available(resolve_auth_mode)
+        if auth_gate is not None:
+            return auth_gate
+
+        db_user_id, db_gate = _require_db_user_id()
+        if db_gate is not None or db_user_id is None:
+            return db_gate
+
+        status = request.args.get("status")
+        limit = request.args.get("limit", type=int)
+        offset = request.args.get("offset", type=int, default=0) or 0
+
+        try:
+            rows = user_db.list_requests(
+                user_id=db_user_id,
+                status=status,
+                limit=limit,
+                offset=offset,
+            )
+        except ValueError as exc:
+            return jsonify({"error": str(exc)}), 400
+        return jsonify(rows)
+
+    @app.route("/api/requests/<int:request_id>", methods=["DELETE"])
+    def api_cancel_request(request_id: int):
+        auth_gate = _require_request_endpoints_available(resolve_auth_mode)
+        if auth_gate is not None:
+            return auth_gate
+
+        db_user_id, db_gate = _require_db_user_id()
+        if db_gate is not None or db_user_id is None:
+            return db_gate
+
+        try:
+            updated = cancel_request(
+                user_db,
+                request_id=request_id,
+                actor_user_id=db_user_id,
+            )
+        except RequestServiceError as exc:
+            return _error_response(str(exc), exc.status_code, code=exc.code)
+
+        event_payload = {
+            "request_id": updated["id"],
+            "status": updated["status"],
+            "title": _resolve_request_title(updated),
+        }
+        actor_label = _format_user_label(normalize_optional_text(session.get("user_id")), db_user_id)
+        logger.info(
+            "Request cancelled #%s for '%s' by %s",
+            updated["id"],
+            event_payload["title"],
+            actor_label,
+        )
+        emit_ws_event(
+            ws_manager,
+            event_name="request_update",
+            payload=event_payload,
+            room=f"user_{db_user_id}",
+        )
+        emit_ws_event(
+            ws_manager,
+            event_name="request_update",
+            payload=event_payload,
+            room="admins",
+        )
+
+        return jsonify(updated)
+
+    @app.route("/api/admin/requests", methods=["GET"])
+    def api_admin_list_requests():
+        auth_gate = _require_request_endpoints_available(resolve_auth_mode)
+        if auth_gate is not None:
+            return auth_gate
+        if not session.get("is_admin", False):
+            return jsonify({"error": "Admin access required"}), 403
+
+        status = request.args.get("status")
+        limit = request.args.get("limit", type=int)
+        offset = request.args.get("offset", type=int, default=0) or 0
+
+        try:
+            rows = user_db.list_requests(status=status, limit=limit, offset=offset)
+        except ValueError as exc:
+            return jsonify({"error": str(exc)}), 400
+
+        populate_request_usernames(rows, user_db)
+
+        return jsonify(rows)
+
+    @app.route("/api/admin/requests/count", methods=["GET"])
+    def api_admin_request_counts():
+        auth_gate = _require_request_endpoints_available(resolve_auth_mode)
+        if auth_gate is not None:
+            return auth_gate
+        if not session.get("is_admin", False):
+            return jsonify({"error": "Admin access required"}), 403
+
+        by_status = {
+            status: len(user_db.list_requests(status=status))
+            for status in RequestStatus
+        }
+        return jsonify(
+            {
+                "pending": by_status[RequestStatus.PENDING],
+                "total": sum(by_status.values()),
+                "by_status": by_status,
+            }
+        )
+
+    @app.route("/api/admin/requests/<int:request_id>/fulfil", methods=["POST"])
+    def api_admin_fulfil_request(request_id: int):
+        auth_gate = _require_request_endpoints_available(resolve_auth_mode)
+        if auth_gate is not None:
+            return auth_gate
+
+        admin_user_id, admin_gate = _require_admin_user_id()
+        if admin_gate is not None:
+            return admin_gate
+
+        data = request.get_json(silent=True) or {}
+        if not isinstance(data, dict):
+            return jsonify({"error": "Invalid payload"}), 400
+
+        try:
+            updated = fulfil_request(
+                user_db,
+                request_id=request_id,
+                admin_user_id=admin_user_id,
+                queue_release=queue_release,
+                release_data=data.get("release_data"),
+                admin_note=data.get("admin_note"),
+                manual_approval=data.get("manual_approval", False),
+            )
+        except RequestServiceError as exc:
+            return _error_response(str(exc), exc.status_code, code=exc.code)
+
+        event_payload = {
+            "request_id": updated["id"],
+            "status": updated["status"],
+            "title": _resolve_request_title(updated),
+        }
+        admin_label = _format_user_label(normalize_optional_text(session.get("user_id")), admin_user_id)
+        requester_label = _format_requester_label(user_db, updated)
+        logger.info(
+            "Request fulfilled #%s for '%s' by %s (requested by %s)",
+            updated["id"],
+            event_payload["title"],
+            admin_label,
+            requester_label,
+        )
+        emit_ws_event(
+            ws_manager,
+            event_name="request_update",
+            payload=event_payload,
+            room=f"user_{updated['user_id']}",
+        )
+        emit_ws_event(
+            ws_manager,
+            event_name="request_update",
+            payload=event_payload,
+            room="admins",
+        )
+
+        _notify_admin_for_request_event(
+            user_db,
+            event=NotificationEvent.REQUEST_FULFILLED,
+            request_row=updated,
+        )
+
+        return jsonify(updated)
+
+    @app.route("/api/admin/requests/<int:request_id>/reject", methods=["POST"])
+    def api_admin_reject_request(request_id: int):
+        auth_gate = _require_request_endpoints_available(resolve_auth_mode)
+        if auth_gate is not None:
+            return auth_gate
+
+        admin_user_id, admin_gate = _require_admin_user_id()
+        if admin_gate is not None:
+            return admin_gate
+
+        data = request.get_json(silent=True) or {}
+        if not isinstance(data, dict):
+            return jsonify({"error": "Invalid payload"}), 400
+
+        try:
+            updated = reject_request(
+                user_db,
+                request_id=request_id,
+                admin_user_id=admin_user_id,
+                admin_note=data.get("admin_note"),
+            )
+        except RequestServiceError as exc:
+            return _error_response(str(exc), exc.status_code, code=exc.code)
+
+        event_payload = {
+            "request_id": updated["id"],
+            "status": updated["status"],
+            "title": _resolve_request_title(updated),
+        }
+        admin_label = _format_user_label(normalize_optional_text(session.get("user_id")), admin_user_id)
+        requester_label = _format_requester_label(user_db, updated)
+        logger.info(
+            "Request rejected #%s for '%s' by %s (requested by %s)",
+            updated["id"],
+            event_payload["title"],
+            admin_label,
+            requester_label,
+        )
+        emit_ws_event(
+            ws_manager,
+            event_name="request_update",
+            payload=event_payload,
+            room=f"user_{updated['user_id']}",
+        )
+        emit_ws_event(
+            ws_manager,
+            event_name="request_update",
+            payload=event_payload,
+            room="admins",
+        )
+
+        _notify_admin_for_request_event(
+            user_db,
+            event=NotificationEvent.REQUEST_REJECTED,
+            request_row=updated,
+        )
+
+        return jsonify(updated)

shelfmark/core/request_validation.py

@@ -0,0 +1,84 @@
+"""Shared request validation and normalization helpers."""
+
+from __future__ import annotations
+
+from enum import Enum
+from typing import Any
+
+from shelfmark.core.models import QueueStatus
+from shelfmark.core.request_policy import parse_policy_mode
+
+
+class RequestStatus(str, Enum):
+    """Enum for request lifecycle statuses."""
+    PENDING = "pending"
+    FULFILLED = "fulfilled"
+    REJECTED = "rejected"
+    CANCELLED = "cancelled"
+
+
+DELIVERY_STATE_NONE = "none"
+
+VALID_REQUEST_STATUSES = frozenset(RequestStatus)
+TERMINAL_REQUEST_STATUSES = frozenset({
+    RequestStatus.FULFILLED, RequestStatus.REJECTED, RequestStatus.CANCELLED,
+})
+VALID_REQUEST_LEVELS = frozenset({"book", "release"})
+VALID_DELIVERY_STATES = frozenset({DELIVERY_STATE_NONE} | set(QueueStatus))
+
+
+def normalize_request_status(status: Any) -> str:
+    """Validate and normalize request status values."""
+    if not isinstance(status, str):
+        raise ValueError(f"Invalid request status: {status}")
+    normalized = status.strip().lower()
+    if normalized not in VALID_REQUEST_STATUSES:
+        raise ValueError(f"Invalid request status: {status}")
+    return normalized
+
+
+def normalize_policy_mode(mode: Any) -> str:
+    """Validate and normalize policy mode values."""
+    parsed = parse_policy_mode(mode)
+    if parsed is None:
+        raise ValueError(f"Invalid policy_mode: {mode}")
+    return parsed.value
+
+
+def normalize_request_level(request_level: Any) -> str:
+    """Validate and normalize request level values."""
+    if not isinstance(request_level, str):
+        raise ValueError(f"Invalid request_level: {request_level}")
+    normalized = request_level.strip().lower()
+    if normalized not in VALID_REQUEST_LEVELS:
+        raise ValueError(f"Invalid request_level: {request_level}")
+    return normalized
+
+
+def normalize_delivery_state(state: Any) -> str:
+    """Validate and normalize delivery-state values."""
+    if not isinstance(state, str):
+        raise ValueError(f"Invalid delivery_state: {state}")
+    normalized = state.strip().lower()
+    if normalized not in VALID_DELIVERY_STATES:
+        raise ValueError(f"Invalid delivery_state: {state}")
+    return normalized
+
+
+def validate_request_level_payload(request_level: Any, release_data: Any) -> str:
+    """Validate request_level and release_data shape coupling."""
+    normalized_level = normalize_request_level(request_level)
+    if normalized_level == "release" and release_data is None:
+        raise ValueError("request_level=release requires non-null release_data")
+    if normalized_level == "book" and release_data is not None:
+        raise ValueError("request_level=book requires null release_data")
+    return normalized_level
+
+
+def validate_status_transition(current_status: Any, new_status: Any) -> tuple[str, str]:
+    """Validate request status transitions and terminal immutability."""
+    current = normalize_request_status(current_status)
+    new = normalize_request_status(new_status)
+    if current in TERMINAL_REQUEST_STATUSES and new != current:
+        raise ValueError("Terminal request statuses are immutable")
+    return current, new

shelfmark/core/requests_service.py

@@ -0,0 +1,465 @@
+"""Request lifecycle helpers and service-level validation."""
+
+from __future__ import annotations
+
+from datetime import datetime, timezone
+import json
+from typing import Any, Callable, TYPE_CHECKING
+
+from shelfmark.core.request_policy import normalize_content_type
+from shelfmark.core.models import QueueStatus
+from shelfmark.core.request_validation import (
+    DELIVERY_STATE_NONE,
+    RequestStatus,
+    normalize_policy_mode,
+    normalize_request_level,
+    normalize_request_status,
+    validate_request_level_payload,
+    validate_status_transition,
+)
+from shelfmark.core.request_helpers import extract_release_source_id, normalize_positive_int
+
+
+MAX_REQUEST_NOTE_LENGTH = 1000
+MAX_REQUEST_JSON_BLOB_BYTES = 10 * 1024
+
+
+if TYPE_CHECKING:
+    from shelfmark.core.user_db import UserDB
+
+
+class RequestServiceError(ValueError):
+    """Structured error raised by request lifecycle service methods."""
+
+    def __init__(
+        self,
+        message: str,
+        *,
+        status_code: int = 400,
+        code: str | None = None,
+    ):
+        super().__init__(message)
+        self.status_code = status_code
+        self.code = code
+
+
+def _normalize_match_text(value: Any) -> str:
+    if not isinstance(value, str):
+        return ""
+    return value.strip().lower()
+
+
+def normalize_note(note: Any) -> str | None:
+    """Validate request notes and normalize empty strings to None."""
+    if note is None:
+        return None
+    if not isinstance(note, str):
+        raise RequestServiceError("note must be a string", status_code=400)
+    normalized = note.strip()
+    if len(normalized) > MAX_REQUEST_NOTE_LENGTH:
+        raise RequestServiceError(
+            f"note must be <= {MAX_REQUEST_NOTE_LENGTH} characters",
+            status_code=400,
+        )
+    return normalized or None
+
+
+def _validate_book_data(book_data: Any) -> dict[str, Any]:
+    if not isinstance(book_data, dict):
+        raise RequestServiceError("book_data must be an object", status_code=400)
+
+    required_fields = ("title", "author", "provider", "provider_id")
+    missing = [field for field in required_fields if not _normalize_match_text(book_data.get(field))]
+    if missing:
+        raise RequestServiceError(
+            f"book_data missing required field(s): {', '.join(missing)}",
+            status_code=400,
+        )
+    return dict(book_data)
+
+
+def _validate_json_blob_size(field: str, payload: Any) -> None:
+    if payload is None:
+        return
+
+    try:
+        serialized = json.dumps(payload, separators=(",", ":"), ensure_ascii=False)
+    except (TypeError, ValueError) as exc:
+        raise RequestServiceError(f"{field} must be JSON-serializable", status_code=400) from exc
+
+    payload_size = len(serialized.encode("utf-8"))
+    if payload_size > MAX_REQUEST_JSON_BLOB_BYTES:
+        raise RequestServiceError(
+            f"{field} must be <= {MAX_REQUEST_JSON_BLOB_BYTES} bytes",
+            status_code=400,
+            code="request_payload_too_large",
+        )
+
+
+def _find_duplicate_pending_request(
+    user_db: "UserDB",
+    *,
+    user_id: int,
+    title: str,
+    author: str,
+    content_type: str,
+) -> dict[str, Any] | None:
+    pending_rows = user_db.list_requests(user_id=user_id, status=RequestStatus.PENDING)
+    for row in pending_rows:
+        row_book_data = row.get("book_data") or {}
+        if not isinstance(row_book_data, dict):
+            continue
+
+        row_title = _normalize_match_text(row_book_data.get("title"))
+        row_author = _normalize_match_text(row_book_data.get("author"))
+        row_content_type = normalize_content_type(
+            row.get("content_type") or row_book_data.get("content_type")
+        )
+        if row_title == title and row_author == author and row_content_type == content_type:
+            return row
+    return None
+
+
+def _now_timestamp() -> str:
+    return datetime.now(timezone.utc).isoformat(timespec="seconds")
+
+
+def _normalize_admin_note(admin_note: Any) -> str | None:
+    if admin_note is None:
+        return None
+    if not isinstance(admin_note, str):
+        raise RequestServiceError("admin_note must be a string", status_code=400)
+    return admin_note.strip() or None
+
+
+def sync_delivery_states_from_queue_status(
+    user_db: "UserDB",
+    *,
+    queue_status: dict[str, dict[str, Any]],
+    user_id: int | None = None,
+) -> list[dict[str, Any]]:
+    """Persist delivery-state transitions for fulfilled requests based on queue status."""
+    fulfilled_rows = user_db.list_requests(user_id=user_id, status=RequestStatus.FULFILLED)
+    if not fulfilled_rows:
+        return []
+
+    unique_request_ids_by_source: dict[str, int] = {}
+    ambiguous_source_ids: set[str] = set()
+    for row in fulfilled_rows:
+        source_id = extract_release_source_id(row.get("release_data"))
+        if source_id is None:
+            continue
+        if source_id in unique_request_ids_by_source:
+            ambiguous_source_ids.add(source_id)
+            continue
+        unique_request_ids_by_source[source_id] = int(row["id"])
+    for source_id in ambiguous_source_ids:
+        unique_request_ids_by_source.pop(source_id, None)
+
+    request_delivery_states: dict[int, str] = {}
+    for status_key in QueueStatus:
+        status_bucket = queue_status.get(status_key)
+        if not isinstance(status_bucket, dict):
+            continue
+        for source_id, task_payload in status_bucket.items():
+            request_id = None
+            if isinstance(task_payload, dict):
+                request_id = normalize_positive_int(task_payload.get("request_id"))
+            if request_id is None:
+                request_id = unique_request_ids_by_source.get(str(source_id).strip())
+            if request_id is None:
+                continue
+            request_delivery_states[request_id] = status_key
+
+    if not request_delivery_states:
+        return []
+    updated: list[dict[str, Any]] = []
+
+    for row in fulfilled_rows:
+        delivery_state = request_delivery_states.get(int(row["id"]))
+        if delivery_state is None:
+            continue
+
+        if row.get("delivery_state", DELIVERY_STATE_NONE) == delivery_state:
+            continue
+
+        updated.append(
+            user_db.update_request(
+                row["id"],
+                delivery_state=delivery_state,
+                delivery_updated_at=_now_timestamp(),
+            )
+        )
+
+    return updated
+
+
+def create_request(
+    user_db: "UserDB",
+    *,
+    user_id: int,
+    source_hint: str | None,
+    content_type: Any,
+    request_level: Any,
+    policy_mode: Any,
+    book_data: Any,
+    release_data: Any = None,
+    note: Any = None,
+    max_pending_per_user: int | None = None,
+) -> dict[str, Any]:
+    """Create a pending request after service-level validation."""
+    validated_book_data = _validate_book_data(book_data)
+    normalized_note = normalize_note(note)
+    normalized_content_type = normalize_content_type(
+        content_type or validated_book_data.get("content_type")
+    )
+    validated_book_data["content_type"] = normalized_content_type
+
+    try:
+        normalized_request_level = validate_request_level_payload(request_level, release_data)
+        normalized_policy_mode = normalize_policy_mode(policy_mode)
+    except ValueError as exc:
+        raise RequestServiceError(str(exc), status_code=400) from exc
+
+    _validate_json_blob_size("book_data", validated_book_data)
+    _validate_json_blob_size("release_data", release_data)
+
+    if max_pending_per_user is not None:
+        pending_count = user_db.count_user_pending_requests(user_id)
+        if pending_count >= max_pending_per_user:
+            raise RequestServiceError(
+                "Maximum pending requests reached for this user",
+                status_code=409,
+                code="max_pending_reached",
+            )
+
+    duplicate = _find_duplicate_pending_request(
+        user_db,
+        user_id=user_id,
+        title=_normalize_match_text(validated_book_data.get("title")),
+        author=_normalize_match_text(validated_book_data.get("author")),
+        content_type=normalized_content_type,
+    )
+    if duplicate is not None:
+        raise RequestServiceError(
+            "Duplicate pending request exists for this title/author/content_type",
+            status_code=409,
+            code="duplicate_pending_request",
+        )
+
+    try:
+        return user_db.create_request(
+            user_id=user_id,
+            source_hint=source_hint,
+            content_type=normalized_content_type,
+            request_level=normalized_request_level,
+            policy_mode=normalized_policy_mode,
+            book_data=validated_book_data,
+            release_data=release_data,
+            note=normalized_note,
+        )
+    except ValueError as exc:
+        raise RequestServiceError(str(exc), status_code=400) from exc
+
+
+def ensure_request_access(
+    user_db: "UserDB",
+    *,
+    request_id: int,
+    actor_user_id: int | None,
+    is_admin: bool,
+) -> dict[str, Any]:
+    """Get request by ID and enforce ownership for non-admin actors."""
+    request_row = user_db.get_request(request_id)
+    if request_row is None:
+        raise RequestServiceError("Request not found", status_code=404)
+
+    if not is_admin:
+        if actor_user_id is None or request_row["user_id"] != actor_user_id:
+            raise RequestServiceError("Forbidden", status_code=403)
+
+    return request_row
+
+
+def _require_pending(request_row: dict[str, Any]) -> None:
+    if request_row["status"] != RequestStatus.PENDING:
+        raise RequestServiceError(
+            "Request is already in a terminal state",
+            status_code=409,
+            code="stale_transition",
+        )
+
+
+def cancel_request(
+    user_db: "UserDB",
+    *,
+    request_id: int,
+    actor_user_id: int,
+) -> dict[str, Any]:
+    """Cancel a pending request owned by the actor."""
+    request_row = ensure_request_access(
+        user_db,
+        request_id=request_id,
+        actor_user_id=actor_user_id,
+        is_admin=False,
+    )
+    _require_pending(request_row)
+
+    try:
+        return user_db.update_request(
+            request_id,
+            expected_current_status=RequestStatus.PENDING,
+            status=RequestStatus.CANCELLED,
+        )
+    except ValueError as exc:
+        raise RequestServiceError(str(exc), status_code=409, code="stale_transition") from exc
+
+
+def reject_request(
+    user_db: "UserDB",
+    *,
+    request_id: int,
+    admin_user_id: int,
+    admin_note: Any = None,
+) -> dict[str, Any]:
+    """Reject a pending request as admin."""
+    request_row = ensure_request_access(
+        user_db,
+        request_id=request_id,
+        actor_user_id=admin_user_id,
+        is_admin=True,
+    )
+    _require_pending(request_row)
+
+    normalized_admin_note = _normalize_admin_note(admin_note)
+
+    try:
+        return user_db.update_request(
+            request_id,
+            expected_current_status=RequestStatus.PENDING,
+            status=RequestStatus.REJECTED,
+            admin_note=normalized_admin_note,
+            reviewed_by=admin_user_id,
+            reviewed_at=_now_timestamp(),
+        )
+    except ValueError as exc:
+        raise RequestServiceError(str(exc), status_code=409, code="stale_transition") from exc
+
+
+def fulfil_request(
+    user_db: "UserDB",
+    *,
+    request_id: int,
+    admin_user_id: int,
+    queue_release: Callable[..., tuple[bool, str | None]],
+    release_data: Any = None,
+    admin_note: Any = None,
+    manual_approval: Any = False,
+) -> dict[str, Any]:
+    """Fulfil a pending request and queue the release under requesting-user identity."""
+    request_row = ensure_request_access(
+        user_db,
+        request_id=request_id,
+        actor_user_id=admin_user_id,
+        is_admin=True,
+    )
+    _require_pending(request_row)
+
+    normalized_admin_note = _normalize_admin_note(admin_note)
+
+    if not isinstance(manual_approval, bool):
+        raise RequestServiceError("manual_approval must be a boolean", status_code=400)
+
+    selected_release_data = release_data if release_data is not None else request_row.get("release_data")
+    if selected_release_data is not None and not isinstance(selected_release_data, dict):
+        raise RequestServiceError("release_data must be an object", status_code=400)
+
+    if selected_release_data is None and manual_approval:
+        try:
+            return user_db.update_request(
+                request_id,
+                expected_current_status=RequestStatus.PENDING,
+                status=RequestStatus.FULFILLED,
+                release_data=None,
+                delivery_state=QueueStatus.COMPLETE,
+                delivery_updated_at=_now_timestamp(),
+                last_failure_reason=None,
+                admin_note=normalized_admin_note,
+                reviewed_by=admin_user_id,
+                reviewed_at=_now_timestamp(),
+            )
+        except ValueError as exc:
+            raise RequestServiceError(str(exc), status_code=409, code="stale_transition") from exc
+
+    if selected_release_data is None:
+        raise RequestServiceError(
+            "release_data is required to fulfil requests",
+            status_code=400,
+        )
+
+    _validate_json_blob_size("release_data", selected_release_data)
+
+    requester = user_db.get_user(user_id=request_row["user_id"])
+    if requester is None:
+        raise RequestServiceError("Requesting user not found", status_code=404)
+
+    original_release_data = request_row.get("release_data")
+    try:
+        claimed_request = user_db.update_request(
+            request_id,
+            expected_current_status=RequestStatus.PENDING,
+            status=RequestStatus.FULFILLED,
+            release_data=selected_release_data,
+            delivery_state=QueueStatus.QUEUED,
+            delivery_updated_at=_now_timestamp(),
+            last_failure_reason=None,
+            admin_note=normalized_admin_note,
+            reviewed_by=admin_user_id,
+            reviewed_at=_now_timestamp(),
+        )
+    except ValueError as exc:
+        raise RequestServiceError(str(exc), status_code=409, code="stale_transition") from exc
+
+    queued_release_data = dict(selected_release_data)
+    queued_release_data["_request_id"] = request_id
+
+    try:
+        success, error = queue_release(
+            queued_release_data,
+            0,
+            user_id=request_row["user_id"],
+            username=requester.get("username"),
+        )
+    except Exception:
+        user_db.rollback_request_fulfilment(
+            request_id,
+            release_data=original_release_data,
+            last_failure_reason="Queue dispatch raised an exception",
+        )
+        raise
+    if not success:
+        user_db.rollback_request_fulfilment(
+            request_id,
+            release_data=original_release_data,
+            last_failure_reason=error,
+        )
+        raise RequestServiceError(
+            error or "Failed to queue release",
+            status_code=409,
+            code="queue_failed",
+        )
+
+    return claimed_request
+
+
+def reopen_failed_request(
+    user_db: "UserDB",
+    *,
+    request_id: int,
+    failure_reason: str | None = None,
+) -> dict[str, Any] | None:
+    """Reopen a failed fulfilled request so admins can re-approve with a new release."""
+    return user_db.reopen_failed_request(
+        request_id,
+        failure_reason=failure_reason,
+    )

shelfmark/core/search_plan.py

@@ -6,6 +6,7 @@ from typing import List, Optional
 MANUAL_QUERY_MAX_LEN = 256
 
 from shelfmark.core.config import config
+from shelfmark.core.models import SearchFilters
 from shelfmark.metadata_providers import (
     BookMetadata,
     group_languages_by_localized_title,
@@ -36,6 +37,8 @@ class ReleaseSearchPlan:
     title_variants: List[ReleaseSearchVariant]
     grouped_title_variants: List[ReleaseSearchVariant]
     manual_query: Optional[str] = None
+    indexers: Optional[List[str]] = None  # Indexer names for Prowlarr (overrides settings)
+    source_filters: Optional[SearchFilters] = None
 
     @property
     def primary_query(self) -> str:
@@ -86,6 +89,8 @@ def build_release_search_plan(
     book: BookMetadata,
     languages: Optional[List[str]] = None,
     manual_query: Optional[str] = None,
+    indexers: Optional[List[str]] = None,
+    source_filters: Optional[SearchFilters] = None,
 ) -> ReleaseSearchPlan:
     resolved_languages = _normalize_languages(languages)
 
@@ -106,6 +111,8 @@ def build_release_search_plan(
             title_variants=[variant],
             grouped_title_variants=[variant],
             manual_query=resolved_manual_query,
+            indexers=indexers,
+            source_filters=source_filters,
         )
 
     isbn_candidates: List[str] = []
@@ -161,4 +168,6 @@ def build_release_search_plan(
         title_variants=title_variants,
         grouped_title_variants=grouped_variants,
         manual_query=None,
+        indexers=indexers,
+        source_filters=source_filters,
     )

shelfmark/core/self_user_routes.py

@@ -0,0 +1,353 @@
+"""Self-service user account routes."""
+
+from functools import wraps
+from typing import Any, Callable, Mapping
+
+from flask import Flask, g, jsonify, request, session
+from werkzeug.security import generate_password_hash
+
+from shelfmark.config.env import CWA_DB_PATH
+from shelfmark.core.admin_settings_routes import (
+    build_user_notification_test_response,
+    validate_user_settings,
+)
+from shelfmark.core.auth_modes import (
+    AUTH_SOURCE_BUILTIN,
+    AUTH_SOURCE_CWA,
+    AUTH_SOURCE_OIDC,
+    AUTH_SOURCE_PROXY,
+    is_user_active_for_auth_mode,
+    load_active_auth_mode,
+    normalize_auth_source,
+)
+from shelfmark.core.logger import setup_logger
+from shelfmark.core.settings_registry import load_config_file
+from shelfmark.core.user_settings_overrides import (
+    build_user_preferences_payload as _build_user_preferences_payload,
+    get_ordered_user_overridable_fields as _get_ordered_user_overridable_fields,
+)
+from shelfmark.core.user_db import UserDB
+
+logger = setup_logger(__name__)
+
+MIN_PASSWORD_LENGTH = 4
+_VISIBLE_SELF_SETTINGS_SECTIONS_KEY = "VISIBLE_SELF_SETTINGS_SECTIONS"
+_SELF_SETTINGS_SECTION_DELIVERY = "delivery"
+_SELF_SETTINGS_SECTION_SEARCH = "search"
+_SELF_SETTINGS_SECTION_NOTIFICATIONS = "notifications"
+_VALID_SELF_SETTINGS_SECTIONS = (
+    _SELF_SETTINGS_SECTION_DELIVERY,
+    _SELF_SETTINGS_SECTION_SEARCH,
+    _SELF_SETTINGS_SECTION_NOTIFICATIONS,
+)
+_DEFAULT_VISIBLE_SELF_SETTINGS_SECTIONS = list(_VALID_SELF_SETTINGS_SECTIONS)
+
+
+def _get_current_user(user_db: UserDB) -> tuple[int | None, dict[str, Any] | None, tuple[Any, int] | None]:
+    raw_user_id = session.get("db_user_id")
+    try:
+        user_id = int(raw_user_id)
+    except (TypeError, ValueError):
+        return None, None, (jsonify({"error": "Invalid user context"}), 400)
+
+    user = user_db.get_user(user_id=user_id)
+    if not user:
+        return None, None, (jsonify({"error": "User not found"}), 404)
+    return user_id, user, None
+
+
+def _get_self_edit_capabilities(user: Mapping[str, Any]) -> dict[str, Any]:
+    auth_source = normalize_auth_source(
+        user.get("auth_source"),
+        user.get("oidc_subject"),
+    )
+
+    return {
+        "authSource": auth_source,
+        "canSetPassword": auth_source == AUTH_SOURCE_BUILTIN,
+        "canEditRole": False,
+        "canEditEmail": auth_source in {AUTH_SOURCE_BUILTIN, AUTH_SOURCE_PROXY},
+        "canEditDisplayName": auth_source != AUTH_SOURCE_OIDC,
+    }
+
+
+def _serialize_self_user(user: Mapping[str, Any], auth_mode: str) -> dict[str, Any]:
+    payload = dict(user)
+    payload.pop("password_hash", None)
+    payload["auth_source"] = normalize_auth_source(
+        payload.get("auth_source"),
+        payload.get("oidc_subject"),
+    )
+    payload["is_active"] = is_user_active_for_auth_mode(payload, auth_mode)
+    payload["edit_capabilities"] = _get_self_edit_capabilities(payload)
+    return payload
+
+
+def _normalize_visible_self_settings_sections(raw_sections: Any) -> list[str]:
+    """Normalize users.VISIBLE_SELF_SETTINGS_SECTIONS to a safe ordered list."""
+    if raw_sections is None:
+        return list(_DEFAULT_VISIBLE_SELF_SETTINGS_SECTIONS)
+
+    if isinstance(raw_sections, str):
+        candidate_sections = [s.strip() for s in raw_sections.split(",") if s.strip()]
+    elif isinstance(raw_sections, (list, tuple, set)):
+        candidate_sections = [str(section).strip() for section in raw_sections if str(section).strip()]
+    else:
+        return list(_DEFAULT_VISIBLE_SELF_SETTINGS_SECTIONS)
+
+    normalized_sections: list[str] = []
+    for section in candidate_sections:
+        if section in _VALID_SELF_SETTINGS_SECTIONS and section not in normalized_sections:
+            normalized_sections.append(section)
+
+    if not normalized_sections and candidate_sections:
+        # Invalid non-empty config should fail-safe to showing defaults.
+        return list(_DEFAULT_VISIBLE_SELF_SETTINGS_SECTIONS)
+
+    return normalized_sections
+
+
+def _get_visible_self_settings_sections() -> list[str]:
+    users_config = load_config_file("users")
+    raw_sections = users_config.get(_VISIBLE_SELF_SETTINGS_SECTIONS_KEY)
+    return _normalize_visible_self_settings_sections(raw_sections)
+
+
+def _get_allowed_self_settings_keys(visible_sections: list[str]) -> set[str]:
+    allowed_keys: set[str] = set()
+    visible_sections_set = set(visible_sections)
+
+    if _SELF_SETTINGS_SECTION_DELIVERY in visible_sections_set:
+        allowed_keys |= {
+            key for key, _field in _get_ordered_user_overridable_fields("downloads")
+        }
+
+    if _SELF_SETTINGS_SECTION_SEARCH in visible_sections_set:
+        allowed_keys |= {
+            key for key, _field in _get_ordered_user_overridable_fields("search_mode")
+        }
+
+    if _SELF_SETTINGS_SECTION_NOTIFICATIONS in visible_sections_set:
+        allowed_keys |= {
+            key for key, _field in _get_ordered_user_overridable_fields("notifications")
+        }
+
+    return allowed_keys
+
+
+def register_self_user_routes(app: Flask, user_db: UserDB) -> None:
+    """Register self-service user endpoints."""
+
+    def _require_authenticated_user(f: Callable[..., Any]) -> Callable[..., Any]:
+        """Decorator requiring an authenticated session linked to a local user row.
+
+        Caches the resolved auth_mode in ``g.auth_mode`` for the request.
+        """
+        @wraps(f)
+        def decorated(*args, **kwargs):
+            auth_mode = load_active_auth_mode(CWA_DB_PATH, user_db=user_db)
+            g.auth_mode = auth_mode
+            if auth_mode != "none" and "user_id" not in session:
+                return jsonify({"error": "Authentication required"}), 401
+            if "db_user_id" not in session:
+                return jsonify({"error": "Authenticated session is missing local user context"}), 403
+            return f(*args, **kwargs)
+        return decorated
+
+    @app.route("/api/users/me/edit-context", methods=["GET"])
+    @_require_authenticated_user
+    def users_me_edit_context():
+        user_id, user, user_error = _get_current_user(user_db)
+        if user_error:
+            return user_error
+
+        serialized_user = _serialize_self_user(user, g.auth_mode)
+        serialized_user["settings"] = user_db.get_user_settings(user_id)
+        visible_self_settings_sections = _get_visible_self_settings_sections()
+
+        delivery_preferences = None
+        if _SELF_SETTINGS_SECTION_DELIVERY in visible_self_settings_sections:
+            try:
+                delivery_preferences = _build_user_preferences_payload(user_db, user_id, "downloads")
+            except ValueError:
+                return jsonify({"error": "Downloads settings tab not found"}), 500
+            except Exception as exc:
+                logger.warning(f"Failed to build user delivery preferences for user_id={user_id}: {exc}")
+                delivery_preferences = None
+
+        search_preferences = None
+        if _SELF_SETTINGS_SECTION_SEARCH in visible_self_settings_sections:
+            try:
+                search_preferences = _build_user_preferences_payload(user_db, user_id, "search_mode")
+            except ValueError:
+                return jsonify({"error": "Search mode settings tab not found"}), 500
+            except Exception as exc:
+                logger.warning(f"Failed to build user search preferences for user_id={user_id}: {exc}")
+                search_preferences = None
+
+        notification_preferences = None
+        if _SELF_SETTINGS_SECTION_NOTIFICATIONS in visible_self_settings_sections:
+            try:
+                notification_preferences = _build_user_preferences_payload(user_db, user_id, "notifications")
+            except ValueError:
+                return jsonify({"error": "Notifications settings tab not found"}), 500
+            except Exception as exc:
+                logger.warning(f"Failed to build user notification preferences for user_id={user_id}: {exc}")
+                notification_preferences = None
+
+        user_overridable_keys = sorted(
+            set(delivery_preferences.get("keys", []) if delivery_preferences else [])
+            | set(search_preferences.get("keys", []) if search_preferences else [])
+            | set(notification_preferences.get("keys", []) if notification_preferences else [])
+        )
+
+        return jsonify(
+            {
+                "user": serialized_user,
+                "deliveryPreferences": delivery_preferences,
+                "searchPreferences": search_preferences,
+                "notificationPreferences": notification_preferences,
+                "userOverridableKeys": user_overridable_keys,
+                "visibleUserSettingsSections": visible_self_settings_sections,
+            }
+        )
+
+    @app.route("/api/users/me/notification-preferences/test", methods=["POST"])
+    @_require_authenticated_user
+    def users_me_test_notification_preferences():
+        user_id, _user, user_error = _get_current_user(user_db)
+        if user_error:
+            return user_error
+        if user_id is None:
+            return jsonify({"error": "User not found"}), 404
+
+        payload = request.get_json(silent=True)
+        result, status_code = build_user_notification_test_response(
+            user_id=user_id,
+            payload=payload,
+        )
+        return jsonify(result), status_code
+
+    @app.route("/api/users/me", methods=["PUT"])
+    @_require_authenticated_user
+    def users_me_update():
+        user_id, user, user_error = _get_current_user(user_db)
+        if user_error:
+            return user_error
+
+        data = request.get_json() or {}
+        if not isinstance(data, dict):
+            return jsonify({"error": "Request body must be a JSON object"}), 400
+
+        capabilities = _get_self_edit_capabilities(user)
+        auth_source = capabilities["authSource"]
+
+        password = data.get("password", "")
+        if password:
+            if not capabilities["canSetPassword"]:
+                return jsonify(
+                    {
+                        "error": f"Cannot set password for {auth_source.upper()} users",
+                        "message": "Password authentication is only available for local users.",
+                    }
+                ), 400
+            if len(password) < MIN_PASSWORD_LENGTH:
+                return jsonify({"error": f"Password must be at least {MIN_PASSWORD_LENGTH} characters"}), 400
+            user_db.update_user(user_id, password_hash=generate_password_hash(password))
+
+        user_fields: dict[str, Any] = {}
+        if "email" in data:
+            incoming_email = data.get("email")
+            if incoming_email is None:
+                user_fields["email"] = None
+            else:
+                user_fields["email"] = str(incoming_email).strip() or None
+        if "display_name" in data:
+            incoming_display_name = data.get("display_name")
+            user_fields["display_name"] = (
+                str(incoming_display_name).strip() or None
+                if incoming_display_name is not None
+                else None
+            )
+
+        email_changed = "email" in user_fields and user_fields["email"] != user.get("email")
+        display_name_changed = (
+            "display_name" in user_fields
+            and user_fields["display_name"] != user.get("display_name")
+        )
+
+        if email_changed and not capabilities["canEditEmail"]:
+            if auth_source == AUTH_SOURCE_CWA:
+                return jsonify(
+                    {
+                        "error": "Cannot change email for CWA users",
+                        "message": "Email is synced from Calibre-Web.",
+                    }
+                ), 400
+            return jsonify(
+                {
+                    "error": "Cannot change email for OIDC users",
+                    "message": "Email is managed by your identity provider.",
+                }
+            ), 400
+
+        if display_name_changed and not capabilities["canEditDisplayName"]:
+            return jsonify(
+                {
+                    "error": "Cannot change display name for OIDC users",
+                    "message": "Display name is managed by your identity provider.",
+                }
+            ), 400
+
+        for field in ("email", "display_name"):
+            if field in user_fields and user_fields[field] == user.get(field):
+                user_fields.pop(field)
+
+        if user_fields:
+            user_db.update_user(user_id, **user_fields)
+
+        if "settings" in data:
+            settings_payload = data["settings"]
+            if not isinstance(settings_payload, dict):
+                return jsonify({"error": "Settings must be an object"}), 400
+
+            visible_self_settings_sections = _get_visible_self_settings_sections()
+            allowed_user_settings_keys = _get_allowed_self_settings_keys(visible_self_settings_sections)
+            disallowed_keys = sorted(
+                key for key in settings_payload if key not in allowed_user_settings_keys
+            )
+            if disallowed_keys:
+                return jsonify(
+                    {
+                        "error": "Some settings are admin-only",
+                        "details": [
+                            f"Setting not user-overridable: {key}" for key in disallowed_keys
+                        ],
+                    }
+                ), 400
+
+            validated_settings, validation_errors = validate_user_settings(settings_payload)
+            if validation_errors:
+                return jsonify(
+                    {
+                        "error": "Invalid settings payload",
+                        "details": validation_errors,
+                    }
+                ), 400
+
+            user_db.set_user_settings(user_id, validated_settings)
+            try:
+                from shelfmark.core.config import config as app_config
+
+                app_config.refresh(force=True)
+            except Exception:
+                pass
+
+        updated = user_db.get_user(user_id=user_id)
+        if not updated:
+            return jsonify({"error": "User not found"}), 404
+
+        result = _serialize_self_user(updated, g.auth_mode)
+        result["settings"] = user_db.get_user_settings(user_id)
+        logger.info(f"User {user_id} updated their own account")
+        return jsonify(result)

shelfmark/core/settings_registry.py

@@ -22,12 +22,14 @@ class FieldBase:
     required: bool = False                # Whether field must have a value
     env_var: Optional[str] = None         # Override env var name (defaults to key)
     env_supported: bool = True            # Whether this setting can be set via ENV var (False = UI-only)
+    user_overridable: bool = False        # Whether admins can set per-user overrides for this field
     disabled: bool = False                # Whether field is disabled/greyed out
     disabled_reason: str = ""             # Explanation shown when disabled
     show_when: Optional[Dict[str, Any] | List[Dict[str, Any]]] = None  # Conditional visibility: {"field": "key", "value": "expected"} or list of conditions
     disabled_when: Optional[Dict[str, Any]] = None  # Conditional disable: {"field": "key", "value": "expected", "reason": "..."}
     requires_restart: bool = False        # Whether changing this setting requires a container restart
     universal_only: bool = False          # Only show in Universal search mode (hide in Direct mode)
+    hidden_in_ui: bool = False            # Keep field in schema/save path but hide default renderer
 
     def get_env_var_name(self) -> str:
         """Get the environment variable name for this field."""
@@ -83,6 +85,14 @@ class MultiSelectField(FieldBase):
     variant: str = "pills"  # "pills" (default) or "dropdown" for checkbox dropdown style
 
 
+@dataclass
+class TagListField(FieldBase):
+    """Editable list of free-form string values (tag/chip input)."""
+    placeholder: str = ""
+    default: List[str] = field(default_factory=list)
+    normalize_urls: bool = True
+
+
 @dataclass
 class OrderableListField(FieldBase):
     # Options can be a list or a callable that returns a list (for lazy evaluation)
@@ -108,6 +118,31 @@ class TableField(FieldBase):
     empty_message: str = ""
 
 
+@dataclass
+class CustomComponentField:
+    """Render a custom frontend component inside settings content."""
+
+    key: str
+    component: str                        # Frontend component registry key
+    label: str = ""
+    description: str = ""
+    bind_keys: List[str] = field(default_factory=list)  # Related value keys this component edits
+    value_fields: List[Any] = field(default_factory=list)  # Backing value schema for this component
+    wrap_in_field_wrapper: bool = False   # Whether to render with standard FieldWrapper layout
+    disabled: bool = False
+    disabled_reason: str = ""
+    show_when: Optional[Dict[str, Any] | List[Dict[str, Any]]] = None
+    universal_only: bool = False
+
+    def get_field_type(self) -> str:
+        return "CustomComponentField"
+
+    def get_bind_keys(self) -> List[str]:
+        if self.bind_keys:
+            return self.bind_keys
+        return [getattr(f, "key") for f in self.value_fields if getattr(f, "key", None)]
+
+
 @dataclass
 class ActionButton:
     key: str                              # Action identifier
@@ -135,6 +170,7 @@ class HeadingField:
     key: str                              # Unique identifier
     title: str                            # Heading title
     description: str = ""                 # Description text (supports markdown-style links)
+    description_by_auth_mode: Optional[Dict[str, str]] = None  # Optional auth-mode specific description map
     link_url: str = ""                    # Optional URL for a link
     link_text: str = ""                   # Text for the link (defaults to URL if not provided)
     show_when: Optional[Dict[str, Any] | List[Dict[str, Any]]] = None  # Conditional visibility: {"field": "key", "value": "expected"} or list of conditions
@@ -145,7 +181,20 @@ class HeadingField:
 
 
 # Type alias for all field types
-SettingsField = Union[TextField, PasswordField, NumberField, CheckboxField, SelectField, MultiSelectField, OrderableListField, ActionButton, HeadingField]
+SettingsField = Union[
+    TextField,
+    PasswordField,
+    NumberField,
+    CheckboxField,
+    SelectField,
+    MultiSelectField,
+    TagListField,
+    OrderableListField,
+    TableField,
+    CustomComponentField,
+    ActionButton,
+    HeadingField,
+]
 
 
 @dataclass
@@ -240,6 +289,48 @@ def get_all_settings_tabs() -> List[SettingsTab]:
     return sorted(_SETTINGS_REGISTRY.values(), key=lambda t: (t.order, t.name))
 
 
+def _iter_value_fields(tab: SettingsTab):
+    """Yield value-bearing fields for a tab."""
+    for field in tab.fields:
+        if isinstance(field, CustomComponentField):
+            for value_field in field.value_fields:
+                if isinstance(value_field, (ActionButton, HeadingField, CustomComponentField)):
+                    continue
+                yield value_field
+            continue
+        if isinstance(field, (ActionButton, HeadingField)):
+            continue
+        yield field
+
+
+def get_settings_field_map(tab_name: Optional[str] = None) -> Dict[str, tuple[SettingsField, str]]:
+    """Return key -> (field, tab_name) map for value-bearing settings fields."""
+    tabs: List[SettingsTab]
+    if tab_name:
+        tab = get_settings_tab(tab_name)
+        if not tab:
+            return {}
+        tabs = [tab]
+    else:
+        tabs = get_all_settings_tabs()
+
+    field_map: Dict[str, tuple[SettingsField, str]] = {}
+    for tab in tabs:
+        for field in _iter_value_fields(tab):
+            field_map[field.key] = (field, tab.name)
+    return field_map
+
+
+def get_user_overridable_fields(tab_name: Optional[str] = None) -> Dict[str, tuple[SettingsField, str]]:
+    """Return key -> (field, tab_name) map for fields marked user_overridable."""
+    field_map = get_settings_field_map(tab_name=tab_name)
+    return {
+        key: (field, tab)
+        for key, (field, tab) in field_map.items()
+        if getattr(field, "user_overridable", False)
+    }
+
+
 def list_registered_settings() -> List[str]:
     """List all registered settings tab names."""
     return list(_SETTINGS_REGISTRY.keys())
@@ -338,11 +429,7 @@ def initialize_default_configs() -> bool:
 
             # Collect default values for all fields
             defaults = {}
-            for field in tab.fields:
-                # Skip non-value fields
-                if isinstance(field, (ActionButton, HeadingField)):
-                    continue
-
+            for field in _iter_value_fields(tab):
                 # Only include fields that have a non-None default
                 if field.default is not None:
                     defaults[field.key] = field.default
@@ -374,11 +461,7 @@ def sync_env_to_config() -> None:
     for tab in get_all_settings_tabs():
         values_to_sync = {}
 
-        for field in tab.fields:
-            # Skip non-value fields
-            if isinstance(field, (ActionButton, HeadingField)):
-                continue
-
+        for field in _iter_value_fields(tab):
             # Skip fields that don't support ENV vars
             if not getattr(field, 'env_supported', True):
                 continue
@@ -398,6 +481,105 @@ def sync_env_to_config() -> None:
             logger.debug(f"Synced {len(values_to_sync)} ENV values to {tab.name} config: {list(values_to_sync.keys())}")
 
     migrate_legacy_settings()
+    migrate_mirror_settings()
+
+
+def migrate_mirror_settings() -> None:
+    """
+    Sync AA mirror list when code defaults change between versions.
+
+    On startup, compares a hash of DEFAULT_AA_MIRRORS against the hash stored
+    in the config file. If they differ (i.e., an update shipped new defaults),
+    the config is overwritten with the new defaults. If they match, the user's
+    customizations are left untouched.
+
+    Also handles legacy migration from AA_ADDITIONAL_URLS.
+    """
+    import hashlib
+
+    from shelfmark.core.mirrors import DEFAULT_AA_MIRRORS
+    from shelfmark.core.utils import normalize_http_url
+
+    def _normalize_list(values: list[str]) -> list[str]:
+        out: list[str] = []
+        for item in values:
+            if str(item).strip().lower() == "auto":
+                continue
+            norm = normalize_http_url(str(item), default_scheme="https")
+            if norm and norm not in out:
+                out.append(norm)
+        return out
+
+    def _hash_mirrors(mirrors: list[str]) -> str:
+        return hashlib.sha256(",".join(mirrors).encode()).hexdigest()
+
+    normalized_defaults = _normalize_list(DEFAULT_AA_MIRRORS)
+    current_defaults_hash = _hash_mirrors(normalized_defaults)
+
+    mirrors_config = load_config_file("mirrors")
+    stored_hash = mirrors_config.get("_AA_MIRRORS_DEFAULTS_HASH")
+    raw_list = mirrors_config.get("AA_MIRROR_URLS")
+    raw_additional = mirrors_config.get("AA_ADDITIONAL_URLS", "")
+
+    def _save_mirrors(values: dict[str, Any]) -> None:
+        merged = dict(mirrors_config)
+        merged.update(values)
+        save_config_file("mirrors", merged)
+        mirrors_config.update(values)
+
+    # Defaults changed since last startup — push new mirrors to config
+    if stored_hash != current_defaults_hash:
+        _save_mirrors({
+            "AA_MIRROR_URLS": normalized_defaults,
+            "_AA_MIRRORS_DEFAULTS_HASH": current_defaults_hash,
+        })
+        return
+
+    # --- Legacy migration (only runs if hash already matches / first time) ---
+
+    # If already a proper list, just ensure it's non-empty.
+    if isinstance(raw_list, list):
+        normalized = _normalize_list([str(v) for v in raw_list])
+        if normalized:
+            return
+        _save_mirrors({
+            "AA_MIRROR_URLS": normalized_defaults,
+            "_AA_MIRRORS_DEFAULTS_HASH": current_defaults_hash,
+        })
+        return
+
+    # If saved as a string, convert to list.
+    if isinstance(raw_list, str) and raw_list.strip():
+        parts = [p.strip() for p in raw_list.split(",") if p.strip()]
+        normalized = _normalize_list(parts)
+        if normalized:
+            _save_mirrors({
+                "AA_MIRROR_URLS": normalized,
+                "_AA_MIRRORS_DEFAULTS_HASH": current_defaults_hash,
+            })
+            return
+        _save_mirrors({
+            "AA_MIRROR_URLS": normalized_defaults,
+            "_AA_MIRRORS_DEFAULTS_HASH": current_defaults_hash,
+        })
+        return
+
+    # If there's legacy additional mirrors, seed the full list.
+    if isinstance(raw_additional, str) and raw_additional.strip():
+        additional_parts = [p.strip() for p in raw_additional.split(",") if p.strip()]
+        combined = _normalize_list(DEFAULT_AA_MIRRORS + additional_parts)
+        if combined:
+            _save_mirrors({
+                "AA_MIRROR_URLS": combined,
+                "_AA_MIRRORS_DEFAULTS_HASH": current_defaults_hash,
+            })
+            return
+
+    # No config at all yet — write defaults
+    _save_mirrors({
+        "AA_MIRROR_URLS": normalized_defaults,
+        "_AA_MIRRORS_DEFAULTS_HASH": current_defaults_hash,
+    })
 
 
 def migrate_legacy_settings() -> None:
@@ -510,7 +692,7 @@ def migrate_legacy_settings() -> None:
 
 
 def get_setting_value(field: SettingsField, tab_name: str) -> Any:
-    if isinstance(field, (ActionButton, HeadingField)):
+    if isinstance(field, (ActionButton, HeadingField, CustomComponentField)):
         return None  # Actions and headings don't have values
 
     # 1. Check environment variable (if supported for this field)
@@ -542,6 +724,8 @@ def _parse_env_value(value: str, field: SettingsField) -> Any:
             return field.default
     elif isinstance(field, MultiSelectField):
         return [v.strip() for v in value.split(',') if v.strip()]
+    elif isinstance(field, TagListField):
+        return [v.strip() for v in value.split(',') if v.strip()]
     elif isinstance(field, OrderableListField):
         # Parse JSON array: [{"id": "...", "enabled": true}, ...]
         try:
@@ -563,7 +747,7 @@ def _parse_env_value(value: str, field: SettingsField) -> Any:
 
 def is_value_from_env(field: SettingsField) -> bool:
     """Check if a field's value comes from an environment variable."""
-    if isinstance(field, (ActionButton, HeadingField)):
+    if isinstance(field, (ActionButton, HeadingField, CustomComponentField)):
         return False
     # UI-only settings never come from ENV (env_supported=False)
     if not getattr(field, 'env_supported', True):
@@ -583,6 +767,36 @@ def serialize_field(field: SettingsField, tab_name: str, include_value: bool = T
     Returns:
         Dict representation of the field.
     """
+    # CustomComponentField has a custom structure - handle separately
+    if isinstance(field, CustomComponentField):
+        result: Dict[str, Any] = {
+            "key": field.key,
+            "label": field.label,
+            "type": field.get_field_type(),
+            "description": field.description,
+            "component": field.component,
+            "bindKeys": field.get_bind_keys(),
+            "wrapInFieldWrapper": field.wrap_in_field_wrapper,
+            "disabled": field.disabled,
+            "disabledReason": field.disabled_reason,
+        }
+        if field.value_fields:
+            bound_fields = []
+            for value_field in field.value_fields:
+                serialized_bound_field = serialize_field(
+                    value_field,
+                    tab_name,
+                    include_value=include_value,
+                )
+                serialized_bound_field["hiddenInUi"] = True
+                bound_fields.append(serialized_bound_field)
+            result["boundFields"] = bound_fields
+        if field.show_when:
+            result["showWhen"] = field.show_when
+        if field.universal_only:
+            result["universalOnly"] = True
+        return result
+
     # HeadingField has a different structure - handle separately
     if isinstance(field, HeadingField):
         result: Dict[str, Any] = {
@@ -591,6 +805,8 @@ def serialize_field(field: SettingsField, tab_name: str, include_value: bool = T
             "title": field.title,
             "description": field.description,
         }
+        if field.description_by_auth_mode:
+            result["descriptionByAuthMode"] = field.description_by_auth_mode
         if field.link_url:
             result["linkUrl"] = field.link_url
             result["linkText"] = field.link_text or field.link_url
@@ -609,6 +825,8 @@ def serialize_field(field: SettingsField, tab_name: str, include_value: bool = T
         "disabled": getattr(field, 'disabled', False),
         "disabledReason": getattr(field, 'disabled_reason', ''),
         "requiresRestart": getattr(field, 'requires_restart', False),
+        "userOverridable": getattr(field, 'user_overridable', False),
+        "hiddenInUi": getattr(field, 'hidden_in_ui', False),
     }
 
     # Add optional properties if set
@@ -643,6 +861,9 @@ def serialize_field(field: SettingsField, tab_name: str, include_value: bool = T
         options = field.options() if callable(field.options) else field.options
         result["options"] = options
         result["variant"] = field.variant
+    elif isinstance(field, TagListField):
+        result["placeholder"] = field.placeholder
+        result["normalizeUrls"] = field.normalize_urls
     elif isinstance(field, OrderableListField):
         # Support callable options for lazy evaluation (avoids circular imports)
         options = field.options() if callable(field.options) else field.options
@@ -656,7 +877,7 @@ def serialize_field(field: SettingsField, tab_name: str, include_value: bool = T
         result["style"] = field.style
         result["description"] = field.description
 
-    if include_value and not isinstance(field, (ActionButton, HeadingField)):
+    if include_value and not isinstance(field, (ActionButton, HeadingField, CustomComponentField)):
         value = get_setting_value(field, tab_name)
 
         # Ensure select values are serialized as strings so the frontend can
@@ -674,6 +895,16 @@ def serialize_field(field: SettingsField, tab_name: str, include_value: bool = T
                 value = [v.strip() for v in value.split(",") if v.strip()]
             else:
                 value = []
+        elif isinstance(field, TagListField):
+            if value is None:
+                value = []
+            elif isinstance(value, list):
+                value = [str(v) for v in value]
+            elif isinstance(value, str):
+                # Support legacy/manual configs where lists were saved as comma-separated strings.
+                value = [v.strip() for v in value.split(",") if v.strip()]
+            else:
+                value = []
         elif isinstance(field, TableField):
             if value is None:
                 value = []
@@ -801,6 +1032,23 @@ def _apply_dns_settings(config) -> None:
     except Exception as e:
         logger.warning(f"Failed to apply DNS settings: {e}")
 
+def _apply_aa_mirror_settings(config) -> None:
+    """
+    Apply AA mirror settings changes to the network module.
+
+    This ensures AA_BASE_URL / AA_ADDITIONAL_URLS changes take effect immediately
+    without requiring a container restart.
+    """
+    try:
+        from shelfmark.download import network
+
+        # Reload AA mirror list and configured base URL from refreshed config.
+        network.init_aa(force=True)
+    except ImportError:
+        pass  # Network module not available
+    except Exception as e:
+        logger.warning(f"Failed to apply AA mirror settings: {e}")
+
 
 def update_settings(tab_name: str, values: Dict[str, Any]) -> Dict[str, Any]:
     tab = get_settings_tab(tab_name)
@@ -808,7 +1056,10 @@ def update_settings(tab_name: str, values: Dict[str, Any]) -> Dict[str, Any]:
         return {"success": False, "message": f"Unknown settings tab: {tab_name}", "updated": [], "requiresRestart": False}
 
     # Build a map of field keys to fields (exclude non-value fields)
-    field_map = {f.key: f for f in tab.fields if not isinstance(f, (ActionButton, HeadingField))}
+    field_map = {
+        key: field
+        for key, (field, _) in get_settings_field_map(tab_name=tab_name).items()
+    }
 
     # Filter out values that are set via env vars or unknown
     values_to_save = {}
@@ -885,6 +1136,27 @@ def update_settings(tab_name: str, values: Dict[str, Any]) -> Dict[str, Any]:
         ):
             _apply_dns_settings(config_obj)
 
+        # Apply certificate validation changes live (network tab)
+        if (
+            config_obj is not None
+            and tab_name == "network"
+            and "CERTIFICATE_VALIDATION" in values_to_save
+        ):
+            try:
+                from shelfmark.download.network import _apply_ssl_warning_suppression
+                _apply_ssl_warning_suppression()
+            except Exception as e:
+                logger.warning(f"Failed to apply certificate validation setting: {e}")
+
+        # Apply AA mirror settings changes live (mirrors tab)
+        aa_keys = {"AA_BASE_URL", "AA_MIRROR_URLS", "AA_ADDITIONAL_URLS"}
+        if (
+            config_obj is not None
+            and tab_name == "mirrors"
+            and aa_keys.intersection(values_to_save.keys())
+        ):
+            _apply_aa_mirror_settings(config_obj)
+
         # Sync metadata provider selection when a provider's enabled state changes
         tab = get_settings_tab(tab_name)
         if tab and tab.group == "metadata_providers":

shelfmark/core/user_db.py

@@ -0,0 +1,859 @@
+"""SQLite user database for multi-user support."""
+
+import json
+import os
+import sqlite3
+import threading
+from typing import Any, Dict, List, Optional
+
+from shelfmark.core.auth_modes import AUTH_SOURCE_BUILTIN, AUTH_SOURCE_SET
+from shelfmark.core.activity_view_state_service import user_viewer_scope
+from shelfmark.core.logger import setup_logger
+from shelfmark.core.request_helpers import normalize_optional_positive_int
+from shelfmark.core.models import QueueStatus
+from shelfmark.core.request_validation import (
+    DELIVERY_STATE_NONE,
+    RequestStatus,
+    normalize_delivery_state,
+    normalize_policy_mode,
+    normalize_request_level,
+    normalize_request_status,
+    validate_request_level_payload,
+    validate_status_transition,
+)
+
+logger = setup_logger(__name__)
+
+_CREATE_TABLES_SQL = """
+CREATE TABLE IF NOT EXISTS users (
+    id            INTEGER PRIMARY KEY AUTOINCREMENT,
+    username      TEXT UNIQUE NOT NULL,
+    email         TEXT,
+    display_name  TEXT,
+    password_hash TEXT,
+    oidc_subject  TEXT UNIQUE,
+    auth_source   TEXT NOT NULL DEFAULT 'builtin',
+    role          TEXT NOT NULL DEFAULT 'user',
+    created_at    TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS user_settings (
+    user_id       INTEGER PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
+    settings_json TEXT NOT NULL DEFAULT '{}'
+);
+
+CREATE TABLE IF NOT EXISTS download_requests (
+    id             INTEGER PRIMARY KEY AUTOINCREMENT,
+    user_id        INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    status         TEXT NOT NULL DEFAULT 'pending',
+    delivery_state TEXT NOT NULL DEFAULT 'none',
+    source_hint    TEXT,
+    content_type   TEXT NOT NULL,
+    request_level  TEXT NOT NULL,
+    policy_mode    TEXT NOT NULL,
+    book_data      TEXT NOT NULL,
+    release_data   TEXT,
+    note           TEXT,
+    admin_note     TEXT,
+    reviewed_by    INTEGER REFERENCES users(id),
+    created_at     TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    reviewed_at    TIMESTAMP,
+    delivery_updated_at TIMESTAMP
+);
+
+CREATE INDEX IF NOT EXISTS idx_download_requests_user_status_created_at
+ON download_requests (user_id, status, created_at DESC);
+
+CREATE INDEX IF NOT EXISTS idx_download_requests_status_created_at
+ON download_requests (status, created_at DESC);
+
+CREATE TABLE IF NOT EXISTS download_history (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    task_id TEXT UNIQUE NOT NULL,
+    user_id INTEGER REFERENCES users(id) ON DELETE SET NULL,
+    username TEXT,
+    request_id INTEGER,
+    source TEXT NOT NULL,
+    source_display_name TEXT,
+    title TEXT NOT NULL,
+    author TEXT,
+    format TEXT,
+    size TEXT,
+    preview TEXT,
+    content_type TEXT,
+    origin TEXT NOT NULL DEFAULT 'direct',
+    final_status TEXT NOT NULL,
+    status_message TEXT,
+    download_path TEXT,
+    queued_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    terminal_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX IF NOT EXISTS idx_download_history_user_status
+ON download_history (user_id, final_status, terminal_at DESC);
+
+CREATE INDEX IF NOT EXISTS idx_download_history_recent
+ON download_history (user_id, terminal_at DESC, id DESC);
+
+CREATE TABLE IF NOT EXISTS activity_view_state (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    viewer_scope TEXT NOT NULL,
+    item_type TEXT NOT NULL,
+    item_key TEXT NOT NULL,
+    dismissed_at TIMESTAMP,
+    cleared_at TIMESTAMP,
+    UNIQUE(viewer_scope, item_type, item_key)
+);
+
+CREATE INDEX IF NOT EXISTS idx_activity_view_state_history
+ON activity_view_state (viewer_scope, dismissed_at DESC, id DESC)
+WHERE dismissed_at IS NOT NULL AND cleared_at IS NULL;
+
+CREATE INDEX IF NOT EXISTS idx_activity_view_state_hidden
+ON activity_view_state (viewer_scope, item_type, item_key)
+WHERE dismissed_at IS NOT NULL;
+"""
+
+
+def get_users_db_path(config_dir: Optional[str] = None) -> str:
+    """Return the configured users database path."""
+    root = config_dir or os.environ.get("CONFIG_DIR", "/config")
+    return os.path.join(root, "users.db")
+
+
+def sync_builtin_admin_user(
+    username: str,
+    password_hash: str,
+    db_path: Optional[str] = None,
+) -> None:
+    """Ensure a local admin user exists for configured builtin credentials."""
+    normalized_username = (username or "").strip()
+    normalized_hash = password_hash or ""
+    if not normalized_username or not normalized_hash:
+        return
+
+    user_db = UserDB(db_path or get_users_db_path())
+    user_db.initialize()
+
+    existing = user_db.get_user(username=normalized_username)
+    if existing:
+        existing_auth_source = str(existing.get("auth_source") or AUTH_SOURCE_BUILTIN).strip().lower()
+        if existing_auth_source != AUTH_SOURCE_BUILTIN:
+            logger.warning(
+                "Skipped builtin admin sync for username '%s' because it belongs to auth_source='%s'",
+                normalized_username,
+                existing_auth_source,
+            )
+            return
+        updates: dict[str, Any] = {}
+        if existing.get("password_hash") != normalized_hash:
+            updates["password_hash"] = normalized_hash
+        if existing.get("role") != "admin":
+            updates["role"] = "admin"
+        if existing.get("auth_source") != AUTH_SOURCE_BUILTIN:
+            updates["auth_source"] = AUTH_SOURCE_BUILTIN
+        if updates:
+            user_db.update_user(existing["id"], **updates)
+            logger.info(f"Updated local admin user '{normalized_username}' from builtin settings")
+        return
+
+    user_db.create_user(
+        username=normalized_username,
+        password_hash=normalized_hash,
+        auth_source=AUTH_SOURCE_BUILTIN,
+        role="admin",
+    )
+    logger.info(f"Created local admin user '{normalized_username}' from builtin settings")
+
+
+class UserDB:
+    """Thread-safe SQLite user database."""
+
+    _VALID_AUTH_SOURCES = set(AUTH_SOURCE_SET)
+
+    def __init__(self, db_path: str):
+        self._db_path = db_path
+        self._lock = threading.Lock()
+
+    def _connect(self) -> sqlite3.Connection:
+        conn = sqlite3.connect(self._db_path)
+        conn.row_factory = sqlite3.Row
+        conn.execute("PRAGMA foreign_keys = ON")
+        return conn
+
+    def initialize(self) -> None:
+        """Create database and tables if they don't exist."""
+        with self._lock:
+            conn = self._connect()
+            try:
+                conn.executescript(_CREATE_TABLES_SQL)
+                self._migrate_auth_source_column(conn)
+                self._migrate_request_delivery_columns(conn)
+                self._migrate_download_history_queued_at(conn)
+                conn.commit()
+                # WAL mode must be changed outside an open transaction.
+                conn.execute("PRAGMA journal_mode=WAL")
+            finally:
+                conn.close()
+
+    def _migrate_auth_source_column(self, conn: sqlite3.Connection) -> None:
+        """Ensure users.auth_source exists and backfill historical rows."""
+        columns = conn.execute("PRAGMA table_info(users)").fetchall()
+        column_names = {str(col["name"]) for col in columns}
+
+        if "auth_source" not in column_names:
+            conn.execute(
+                "ALTER TABLE users ADD COLUMN auth_source TEXT NOT NULL DEFAULT 'builtin'"
+            )
+
+        # Backfill OIDC-origin users created before auth_source existed.
+        conn.execute(
+            "UPDATE users SET auth_source = 'oidc' WHERE oidc_subject IS NOT NULL"
+        )
+        # Defensive cleanup for any legacy null/blank values.
+        conn.execute(
+            "UPDATE users SET auth_source = 'builtin' WHERE auth_source IS NULL OR auth_source = ''"
+        )
+
+    def _migrate_request_delivery_columns(self, conn: sqlite3.Connection) -> None:
+        """Ensure request delivery-state columns exist and backfill historical rows."""
+        columns = conn.execute("PRAGMA table_info(download_requests)").fetchall()
+        column_names = {str(col["name"]) for col in columns}
+
+        if "delivery_state" not in column_names:
+            conn.execute(
+                "ALTER TABLE download_requests ADD COLUMN delivery_state TEXT NOT NULL DEFAULT 'none'"
+            )
+        if "delivery_updated_at" not in column_names:
+            conn.execute("ALTER TABLE download_requests ADD COLUMN delivery_updated_at TIMESTAMP")
+        if "last_failure_reason" not in column_names:
+            conn.execute("ALTER TABLE download_requests ADD COLUMN last_failure_reason TEXT")
+
+        conn.execute(
+            """
+            UPDATE download_requests
+            SET delivery_state = 'none'
+            WHERE delivery_state IS NULL OR TRIM(delivery_state) = '' OR delivery_state IN ('unknown', 'available', 'done')
+            """
+        )
+        conn.execute(
+            """
+            UPDATE download_requests
+            SET delivery_updated_at = COALESCE(delivery_updated_at, reviewed_at, created_at)
+            WHERE delivery_state != 'none' AND delivery_updated_at IS NULL
+            """
+        )
+
+    def _migrate_download_history_queued_at(self, conn: sqlite3.Connection) -> None:
+        """Ensure download_history.queued_at exists for queue-time recording."""
+        columns = conn.execute("PRAGMA table_info(download_history)").fetchall()
+        column_names = {str(col["name"]) for col in columns}
+        if "queued_at" not in column_names:
+            conn.execute("ALTER TABLE download_history ADD COLUMN queued_at TIMESTAMP")
+            conn.execute(
+                "UPDATE download_history SET queued_at = CURRENT_TIMESTAMP WHERE queued_at IS NULL"
+            )
+
+    def create_user(
+        self,
+        username: str,
+        email: Optional[str] = None,
+        display_name: Optional[str] = None,
+        password_hash: Optional[str] = None,
+        oidc_subject: Optional[str] = None,
+        auth_source: str = "builtin",
+        role: str = "user",
+    ) -> Dict[str, Any]:
+        """Create a new user. Raises ValueError if username or oidc_subject already exists."""
+        if auth_source not in self._VALID_AUTH_SOURCES:
+            raise ValueError(f"Invalid auth_source: {auth_source}")
+        with self._lock:
+            conn = self._connect()
+            try:
+                cursor = conn.execute(
+                    """INSERT INTO users (
+                           username, email, display_name, password_hash, oidc_subject, auth_source, role
+                       )
+                       VALUES (?, ?, ?, ?, ?, ?, ?)""",
+                    (
+                        username,
+                        email,
+                        display_name,
+                        password_hash,
+                        oidc_subject,
+                        auth_source,
+                        role,
+                    ),
+                )
+                conn.commit()
+                user_id = cursor.lastrowid
+                return self._get_user_by_id(conn, user_id)
+            except sqlite3.IntegrityError as e:
+                raise ValueError(f"User already exists: {e}")
+            finally:
+                conn.close()
+
+    def get_user(
+        self,
+        user_id: Optional[int] = None,
+        username: Optional[str] = None,
+        oidc_subject: Optional[str] = None,
+    ) -> Optional[Dict[str, Any]]:
+        """Get a user by id, username, or oidc_subject. Returns None if not found."""
+        conn = self._connect()
+        try:
+            if user_id is not None:
+                return self._get_user_by_id(conn, user_id)
+            elif username is not None:
+                row = conn.execute(
+                    "SELECT * FROM users WHERE username = ?", (username,)
+                ).fetchone()
+            elif oidc_subject is not None:
+                row = conn.execute(
+                    "SELECT * FROM users WHERE oidc_subject = ?", (oidc_subject,)
+                ).fetchone()
+            else:
+                return None
+            return dict(row) if row else None
+        finally:
+            conn.close()
+
+    def _get_user_by_id(self, conn: sqlite3.Connection, user_id: int) -> Optional[Dict[str, Any]]:
+        row = conn.execute("SELECT * FROM users WHERE id = ?", (user_id,)).fetchone()
+        return dict(row) if row else None
+
+    _ALLOWED_UPDATE_COLUMNS = {
+        "email",
+        "display_name",
+        "password_hash",
+        "oidc_subject",
+        "auth_source",
+        "role",
+    }
+
+    def update_user(self, user_id: int, **kwargs) -> None:
+        """Update user fields. Raises ValueError if user not found or invalid column."""
+        if not kwargs:
+            return
+        for k in kwargs:
+            if k not in self._ALLOWED_UPDATE_COLUMNS:
+                raise ValueError(f"Invalid column: {k}")
+        if "auth_source" in kwargs and kwargs["auth_source"] not in self._VALID_AUTH_SOURCES:
+            raise ValueError(f"Invalid auth_source: {kwargs['auth_source']}")
+        with self._lock:
+            conn = self._connect()
+            try:
+                # Verify user exists
+                if not self._get_user_by_id(conn, user_id):
+                    raise ValueError(f"User {user_id} not found")
+                sets = ", ".join(f"{k} = ?" for k in kwargs)
+                values = list(kwargs.values()) + [user_id]
+                conn.execute(f"UPDATE users SET {sets} WHERE id = ?", values)
+                conn.commit()
+            finally:
+                conn.close()
+
+    def delete_user(self, user_id: int) -> None:
+        """Delete a user and their settings."""
+        with self._lock:
+            conn = self._connect()
+            try:
+                request_rows = conn.execute(
+                    "SELECT id FROM download_requests WHERE user_id = ?",
+                    (user_id,),
+                ).fetchall()
+                request_item_keys = [f"request:{row['id']}" for row in request_rows]
+                if request_item_keys:
+                    placeholders = ",".join("?" for _ in request_item_keys)
+                    conn.execute(
+                        f"""
+                        DELETE FROM activity_view_state
+                        WHERE item_type = 'request'
+                          AND item_key IN ({placeholders})
+                        """,
+                        request_item_keys,
+                    )
+                conn.execute(
+                    "DELETE FROM activity_view_state WHERE viewer_scope = ?",
+                    (user_viewer_scope(user_id),),
+                )
+                conn.execute("UPDATE download_requests SET reviewed_by = NULL WHERE reviewed_by = ?", (user_id,))
+                conn.execute("DELETE FROM users WHERE id = ?", (user_id,))
+                conn.commit()
+            finally:
+                conn.close()
+
+    def list_users(self) -> List[Dict[str, Any]]:
+        """List all users."""
+        conn = self._connect()
+        try:
+            rows = conn.execute("SELECT * FROM users ORDER BY id").fetchall()
+            return [dict(r) for r in rows]
+        finally:
+            conn.close()
+
+    def has_admin_with_password(self) -> bool:
+        """Return True when at least one admin user with a password hash exists."""
+        conn = self._connect()
+        try:
+            row = conn.execute(
+                "SELECT 1 FROM users WHERE role = 'admin'"
+                " AND password_hash IS NOT NULL AND password_hash != ''"
+                " LIMIT 1",
+            ).fetchone()
+            return row is not None
+        finally:
+            conn.close()
+
+    def get_user_settings(self, user_id: int) -> Dict[str, Any]:
+        """Get per-user settings. Returns empty dict if none set."""
+        conn = self._connect()
+        try:
+            row = conn.execute(
+                "SELECT settings_json FROM user_settings WHERE user_id = ?", (user_id,)
+            ).fetchone()
+            if row:
+                return json.loads(row["settings_json"])
+            return {}
+        finally:
+            conn.close()
+
+    def set_user_settings(self, user_id: int, settings: Dict[str, Any]) -> None:
+        """Merge settings into user's existing settings."""
+        with self._lock:
+            conn = self._connect()
+            try:
+                existing = {}
+                row = conn.execute(
+                    "SELECT settings_json FROM user_settings WHERE user_id = ?", (user_id,)
+                ).fetchone()
+                if row:
+                    existing = json.loads(row["settings_json"])
+
+                existing.update(settings)
+                # Remove keys set to None (meaning "clear this override")
+                existing = {k: v for k, v in existing.items() if v is not None}
+                settings_json = json.dumps(existing)
+
+                conn.execute(
+                    """INSERT INTO user_settings (user_id, settings_json) VALUES (?, ?)
+                       ON CONFLICT(user_id) DO UPDATE SET settings_json = ?""",
+                    (user_id, settings_json, settings_json),
+                )
+                conn.commit()
+            finally:
+                conn.close()
+
+    @staticmethod
+    def _serialize_json(value: Any, field: str) -> Optional[str]:
+        if value is None:
+            return None
+        try:
+            return json.dumps(value)
+        except TypeError as exc:
+            raise ValueError(f"{field} must be JSON-serializable") from exc
+
+    @staticmethod
+    def _parse_request_row(row: Optional[sqlite3.Row]) -> Optional[Dict[str, Any]]:
+        if row is None:
+            return None
+
+        payload = dict(row)
+        for key in ("book_data", "release_data"):
+            raw_value = payload.get(key)
+            if raw_value is None:
+                payload[key] = None
+                continue
+            try:
+                payload[key] = json.loads(raw_value)
+            except (ValueError, TypeError):
+                payload[key] = None
+        return payload
+
+    def create_request(
+        self,
+        *,
+        user_id: int,
+        content_type: str,
+        request_level: str,
+        policy_mode: str,
+        book_data: Dict[str, Any],
+        release_data: Optional[Dict[str, Any]] = None,
+        status: str = RequestStatus.PENDING,
+        source_hint: Optional[str] = None,
+        note: Optional[str] = None,
+        admin_note: Optional[str] = None,
+        reviewed_by: Optional[int] = None,
+        reviewed_at: Optional[str] = None,
+        delivery_state: str = DELIVERY_STATE_NONE,
+        delivery_updated_at: Optional[str] = None,
+    ) -> Dict[str, Any]:
+        """Create a download request row and return the created record."""
+        if not isinstance(book_data, dict):
+            raise ValueError("book_data must be an object")
+        if release_data is not None and not isinstance(release_data, dict):
+            raise ValueError("release_data must be an object when provided")
+        if not content_type:
+            raise ValueError("content_type is required")
+
+        normalized_status = normalize_request_status(status)
+        normalized_delivery_state = normalize_delivery_state(delivery_state)
+        normalized_policy_mode = normalize_policy_mode(policy_mode)
+        normalized_request_level = validate_request_level_payload(request_level, release_data)
+
+        with self._lock:
+            conn = self._connect()
+            try:
+                cursor = conn.execute(
+                    """
+                    INSERT INTO download_requests (
+                        user_id,
+                        status,
+                        delivery_state,
+                        source_hint,
+                        content_type,
+                        request_level,
+                        policy_mode,
+                        book_data,
+                        release_data,
+                        note,
+                        admin_note,
+                        reviewed_by,
+                        reviewed_at,
+                        delivery_updated_at
+                    )
+                    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+                    """,
+                    (
+                        user_id,
+                        normalized_status,
+                        normalized_delivery_state,
+                        source_hint,
+                        content_type,
+                        normalized_request_level,
+                        normalized_policy_mode,
+                        self._serialize_json(book_data, "book_data"),
+                        self._serialize_json(release_data, "release_data"),
+                        note,
+                        admin_note,
+                        reviewed_by,
+                        reviewed_at,
+                        delivery_updated_at,
+                    ),
+                )
+                conn.commit()
+                request_id = cursor.lastrowid
+                row = conn.execute(
+                    "SELECT * FROM download_requests WHERE id = ?",
+                    (request_id,),
+                ).fetchone()
+                parsed = self._parse_request_row(row)
+                if parsed is None:
+                    raise ValueError(f"Request {request_id} not found after creation")
+                return parsed
+            finally:
+                conn.close()
+
+    def get_request(self, request_id: int) -> Optional[Dict[str, Any]]:
+        """Get a request row by ID."""
+        conn = self._connect()
+        try:
+            row = conn.execute(
+                "SELECT * FROM download_requests WHERE id = ?",
+                (request_id,),
+            ).fetchone()
+            return self._parse_request_row(row)
+        finally:
+            conn.close()
+
+    def list_requests(
+        self,
+        *,
+        user_id: Optional[int] = None,
+        status: Optional[str] = None,
+        limit: Optional[int] = None,
+        offset: int = 0,
+    ) -> List[Dict[str, Any]]:
+        """List requests with optional user/status filters."""
+        where_clauses: List[str] = []
+        params: List[Any] = []
+
+        if user_id is not None:
+            where_clauses.append("user_id = ?")
+            params.append(user_id)
+
+        if status is not None:
+            where_clauses.append("status = ?")
+            params.append(normalize_request_status(status))
+
+        query = "SELECT * FROM download_requests"
+        if where_clauses:
+            query += " WHERE " + " AND ".join(where_clauses)
+        query += " ORDER BY created_at DESC, id DESC"
+
+        if limit is not None:
+            query += " LIMIT ?"
+            params.append(int(limit))
+            if offset:
+                query += " OFFSET ?"
+                params.append(offset)
+        elif offset:
+            query += " LIMIT -1 OFFSET ?"
+            params.append(offset)
+
+        conn = self._connect()
+        try:
+            rows = conn.execute(query, params).fetchall()
+            results: List[Dict[str, Any]] = []
+            for row in rows:
+                parsed = self._parse_request_row(row)
+                if parsed is not None:
+                    results.append(parsed)
+            return results
+        finally:
+            conn.close()
+
+    _ALLOWED_REQUEST_UPDATE_COLUMNS = {
+        "status",
+        "source_hint",
+        "content_type",
+        "request_level",
+        "policy_mode",
+        "book_data",
+        "release_data",
+        "note",
+        "admin_note",
+        "reviewed_by",
+        "reviewed_at",
+        "delivery_state",
+        "delivery_updated_at",
+        "last_failure_reason",
+    }
+
+    def update_request(
+        self,
+        request_id: int,
+        expected_current_status: Optional[str] = None,
+        **kwargs,
+    ) -> Dict[str, Any]:
+        """Update request fields and return the updated record."""
+        if not kwargs:
+            request = self.get_request(request_id)
+            if request is None:
+                raise ValueError(f"Request {request_id} not found")
+            if expected_current_status is not None:
+                normalized_expected_status = normalize_request_status(expected_current_status)
+                if request["status"] != normalized_expected_status:
+                    raise ValueError("Request state changed before update")
+            return request
+
+        for key in kwargs:
+            if key not in self._ALLOWED_REQUEST_UPDATE_COLUMNS:
+                raise ValueError(f"Invalid request column: {key}")
+
+        with self._lock:
+            conn = self._connect()
+            try:
+                row = conn.execute(
+                    "SELECT * FROM download_requests WHERE id = ?",
+                    (request_id,),
+                ).fetchone()
+                current = self._parse_request_row(row)
+                if current is None:
+                    raise ValueError(f"Request {request_id} not found")
+
+                if expected_current_status is not None:
+                    normalized_expected_status = normalize_request_status(expected_current_status)
+                    if current["status"] != normalized_expected_status:
+                        raise ValueError("Request state changed before update")
+
+                updates = dict(kwargs)
+
+                if "status" in updates:
+                    _, normalized_status = validate_status_transition(
+                        current["status"],
+                        updates["status"],
+                    )
+                    updates["status"] = normalized_status
+
+                if "policy_mode" in updates:
+                    updates["policy_mode"] = normalize_policy_mode(updates["policy_mode"])
+
+                if "delivery_state" in updates:
+                    updates["delivery_state"] = normalize_delivery_state(updates["delivery_state"])
+
+                if "delivery_updated_at" in updates:
+                    delivery_updated_at = updates["delivery_updated_at"]
+                    if delivery_updated_at is not None and not isinstance(delivery_updated_at, str):
+                        raise ValueError("delivery_updated_at must be a string when provided")
+
+                if "content_type" in updates and not updates["content_type"]:
+                    raise ValueError("content_type is required")
+
+                if "request_level" in updates:
+                    updates["request_level"] = normalize_request_level(updates["request_level"])
+
+                if "book_data" in updates:
+                    if not isinstance(updates["book_data"], dict):
+                        raise ValueError("book_data must be an object")
+                    updates["book_data"] = self._serialize_json(updates["book_data"], "book_data")
+
+                if "release_data" in updates:
+                    if updates["release_data"] is not None and not isinstance(updates["release_data"], dict):
+                        raise ValueError("release_data must be an object when provided")
+                    updates["release_data"] = self._serialize_json(
+                        updates["release_data"],
+                        "release_data",
+                    )
+
+                set_clause = ", ".join(f"{column} = ?" for column in updates)
+                values = list(updates.values()) + [request_id]
+                conn.execute(
+                    f"UPDATE download_requests SET {set_clause} WHERE id = ?",
+                    values,
+                )
+                conn.commit()
+
+                updated_row = conn.execute(
+                    "SELECT * FROM download_requests WHERE id = ?",
+                    (request_id,),
+                ).fetchone()
+                parsed = self._parse_request_row(updated_row)
+                if parsed is None:
+                    raise ValueError(f"Request {request_id} not found after update")
+                return parsed
+            finally:
+                conn.close()
+
+    def reopen_failed_request(
+        self,
+        request_id: int,
+        *,
+        failure_reason: Optional[str] = None,
+    ) -> Optional[Dict[str, Any]]:
+        """Reopen a failed fulfilled request so admins can re-approve it."""
+        normalized_failure_reason = None
+        if isinstance(failure_reason, str):
+            normalized_failure_reason = failure_reason.strip() or None
+
+        with self._lock:
+            conn = self._connect()
+            try:
+                current_row = conn.execute(
+                    "SELECT * FROM download_requests WHERE id = ?",
+                    (request_id,),
+                ).fetchone()
+                current_request = self._parse_request_row(current_row)
+                if current_request is None:
+                    return None
+
+                if current_request.get("status") != RequestStatus.FULFILLED:
+                    return None
+
+                current_delivery_state = current_request.get("delivery_state", DELIVERY_STATE_NONE)
+
+                # Terminal hook callbacks can run before delivery-state sync persists "error".
+                # Allow reopening fulfilled requests unless they are already complete.
+                if current_delivery_state == QueueStatus.COMPLETE:
+                    return None
+                if (
+                    current_delivery_state not in {QueueStatus.ERROR, QueueStatus.CANCELLED}
+                    and normalized_failure_reason is None
+                ):
+                    return None
+
+                conn.execute(
+                    """
+                    UPDATE download_requests
+                    SET status = 'pending',
+                        delivery_state = 'none',
+                        delivery_updated_at = NULL,
+                        release_data = NULL,
+                        last_failure_reason = ?,
+                        reviewed_by = NULL,
+                        reviewed_at = NULL
+                    WHERE id = ?
+                    """,
+                    (normalized_failure_reason, request_id),
+                )
+                updated_row = conn.execute(
+                    "SELECT * FROM download_requests WHERE id = ?",
+                    (request_id,),
+                ).fetchone()
+                conn.commit()
+                return self._parse_request_row(updated_row)
+            finally:
+                conn.close()
+
+    def rollback_request_fulfilment(
+        self,
+        request_id: int,
+        *,
+        release_data: Optional[Dict[str, Any]],
+        last_failure_reason: Optional[str] = None,
+    ) -> Dict[str, Any]:
+        """Restore a request to pending after fulfilment claimed it but queueing failed."""
+        with self._lock:
+            conn = self._connect()
+            try:
+                row = conn.execute(
+                    "SELECT * FROM download_requests WHERE id = ?",
+                    (request_id,),
+                ).fetchone()
+                current = self._parse_request_row(row)
+                if current is None:
+                    raise ValueError(f"Request {request_id} not found")
+
+                conn.execute(
+                    """
+                    UPDATE download_requests
+                    SET status = 'pending',
+                        release_data = ?,
+                        admin_note = NULL,
+                        reviewed_by = NULL,
+                        reviewed_at = NULL,
+                        delivery_state = 'none',
+                        delivery_updated_at = NULL,
+                        last_failure_reason = ?
+                    WHERE id = ?
+                    """,
+                    (
+                        self._serialize_json(release_data, "release_data"),
+                        last_failure_reason,
+                        request_id,
+                    ),
+                )
+                updated_row = conn.execute(
+                    "SELECT * FROM download_requests WHERE id = ?",
+                    (request_id,),
+                ).fetchone()
+                conn.commit()
+                parsed = self._parse_request_row(updated_row)
+                if parsed is None:
+                    raise ValueError(f"Request {request_id} not found after rollback")
+                return parsed
+            finally:
+                conn.close()
+
+    def count_pending_requests(self) -> int:
+        """Count all pending requests."""
+        conn = self._connect()
+        try:
+            row = conn.execute(
+                "SELECT COUNT(*) AS count FROM download_requests WHERE status = 'pending'"
+            ).fetchone()
+            return int(row["count"]) if row else 0
+        finally:
+            conn.close()
+
+    def count_user_pending_requests(self, user_id: int) -> int:
+        """Count pending requests for a specific user."""
+        conn = self._connect()
+        try:
+            row = conn.execute(
+                "SELECT COUNT(*) AS count FROM download_requests WHERE user_id = ? AND status = 'pending'",
+                (user_id,),
+            ).fetchone()
+            return int(row["count"]) if row else 0
+        finally:
+            conn.close()

shelfmark/core/user_settings_overrides.py

@@ -0,0 +1,78 @@
+"""Shared helpers for user-overridable settings metadata and payloads."""
+
+from typing import Any
+
+from shelfmark.core.settings_registry import load_config_file
+from shelfmark.core.user_db import UserDB
+
+
+def get_settings_registry():
+    # Ensure settings modules are loaded before reading registry metadata.
+    import shelfmark.config.settings  # noqa: F401
+    import shelfmark.config.security  # noqa: F401
+    import shelfmark.config.notifications_settings  # noqa: F401
+    import shelfmark.config.users_settings  # noqa: F401
+    from shelfmark.core import settings_registry
+
+    return settings_registry
+
+
+def get_ordered_user_overridable_fields(tab_name: str) -> list[tuple[str, Any]]:
+    settings_registry = get_settings_registry()
+    tab = settings_registry.get_settings_tab(tab_name)
+    if not tab:
+        return []
+    overridable_map = settings_registry.get_user_overridable_fields(tab_name=tab_name)
+    return [(field.key, field) for field in tab.fields if field.key in overridable_map]
+
+
+def build_user_preferences_payload(user_db: UserDB, user_id: int, tab_name: str) -> dict[str, Any]:
+    from shelfmark.core.config import config as app_config
+
+    settings_registry = get_settings_registry()
+    ordered_fields = get_ordered_user_overridable_fields(tab_name)
+    if not ordered_fields:
+        tab_label = tab_name.capitalize()
+        raise ValueError(f"{tab_label} settings tab not found")
+
+    tab_config = load_config_file(tab_name)
+    user_settings = user_db.get_user_settings(user_id)
+    ordered_keys = [key for key, _ in ordered_fields]
+
+    fields_payload: list[dict[str, Any]] = []
+    global_values: dict[str, Any] = {}
+    effective: dict[str, dict[str, Any]] = {}
+
+    for key, field in ordered_fields:
+        serialized = settings_registry.serialize_field(field, tab_name, include_value=False)
+        serialized["fromEnv"] = bool(field.env_supported and settings_registry.is_value_from_env(field))
+        fields_payload.append(serialized)
+
+        global_values[key] = app_config.get(key, field.default)
+
+        source = "default"
+        value = app_config.get(key, field.default, user_id=user_id)
+        if field.env_supported and settings_registry.is_value_from_env(field):
+            source = "env_var"
+        elif key in user_settings and user_settings[key] is not None:
+            source = "user_override"
+            value = user_settings[key]
+        elif key in tab_config:
+            source = "global_config"
+
+        effective[key] = {"value": value, "source": source}
+
+    user_overrides = {
+        key: user_settings[key]
+        for key in ordered_keys
+        if key in user_settings and user_settings[key] is not None
+    }
+
+    return {
+        "tab": tab_name,
+        "keys": ordered_keys,
+        "fields": fields_payload,
+        "globalValues": global_values,
+        "userOverrides": user_overrides,
+        "effective": effective,
+    }

shelfmark/core/utils.py

@@ -1,6 +1,11 @@
 """Shared utility functions for the Shelfmark."""
 
 import base64
+import importlib
+import os
+import re
+from threading import Lock
+from types import ModuleType
 from pathlib import Path
 from typing import Optional
 from urllib.parse import urlparse
@@ -52,6 +57,28 @@ def normalize_http_url(
     return normalized
 
 
+_xmlrpc_patch_lock = Lock()
+_xmlrpc_patch_applied = False
+
+
+def get_hardened_xmlrpc_client() -> ModuleType:
+    """Return ``xmlrpc.client`` after best-effort defusedxml monkey patching."""
+    global _xmlrpc_patch_applied
+    if not _xmlrpc_patch_applied:
+        with _xmlrpc_patch_lock:
+            if not _xmlrpc_patch_applied:
+                try:
+                    from defusedxml.xmlrpc import monkey_patch
+
+                    monkey_patch()
+                    _xmlrpc_patch_applied = True
+                except Exception:
+                    # Keep runtime behavior unchanged if defusedxml is unavailable.
+                    _xmlrpc_patch_applied = False
+
+    return importlib.import_module("xmlrpc.client")
+
+
 def normalize_base_path(value: Optional[str]) -> str:
     """Normalize a URL base path for reverse proxy subpath deployments."""
     if not isinstance(value, str):
@@ -118,21 +145,88 @@ _LEGACY_CONTENT_TYPE_TO_CONFIG_KEY = {
     "other": "INGEST_DIR_OTHER",
 }
 
+_USER_PLACEHOLDER_PATTERN = re.compile(r"\{user\}", re.IGNORECASE)
+_INVALID_USER_PATH_CHARS = re.compile(r'[\\/:*?"<>|]')
 
-def get_destination(is_audiobook: bool = False) -> Path:
+
+def _sanitize_user_for_path(username: str) -> str:
+    """Sanitize username for path usage in destination placeholders."""
+    sanitized = _INVALID_USER_PATH_CHARS.sub("_", username.strip())
+    return sanitized.strip(" .")
+
+
+def _resolve_destination_username(
+    user_id: Optional[int] = None,
+    username: Optional[str] = None,
+) -> str:
+    explicit = str(username or "").strip()
+    if explicit:
+        return explicit
+
+    if user_id is None:
+        return ""
+
+    try:
+        from shelfmark.core.user_db import UserDB
+
+        user_db = UserDB(os.path.join(os.environ.get("CONFIG_DIR", "/config"), "users.db"))
+        user_db.initialize()
+        user = user_db.get_user(user_id=user_id)
+        if not user:
+            return ""
+        return str(user.get("username") or "").strip()
+    except Exception:
+        return ""
+
+
+def _expand_user_destination_placeholder(
+    path_value: str,
+    user_id: Optional[int] = None,
+    username: Optional[str] = None,
+) -> str:
+    """Expand `{User}` placeholders in destination paths."""
+    if not isinstance(path_value, str):
+        return path_value
+
+    if not _USER_PLACEHOLDER_PATTERN.search(path_value):
+        return path_value
+
+    resolved_username = _sanitize_user_for_path(
+        _resolve_destination_username(user_id=user_id, username=username)
+    )
+    return _USER_PLACEHOLDER_PATTERN.sub(resolved_username, path_value)
+
+
+def get_destination(
+    is_audiobook: bool = False,
+    user_id: Optional[int] = None,
+    username: Optional[str] = None,
+) -> Path:
     """Get base destination directory. Audiobooks fall back to main destination."""
     from shelfmark.core.config import config
 
     if is_audiobook:
         # Audiobook destination with fallback to main destination
-        audiobook_dest = config.get("DESTINATION_AUDIOBOOK", "")
+        audiobook_dest = config.get("DESTINATION_AUDIOBOOK", "", user_id=user_id)
         if audiobook_dest:
-            return Path(audiobook_dest)
+            return Path(
+                _expand_user_destination_placeholder(
+                    str(audiobook_dest),
+                    user_id=user_id,
+                    username=username,
+                )
+            )
 
     # Main destination (also fallback for audiobooks)
     # Check new setting first, then legacy INGEST_DIR
-    destination = config.get("DESTINATION", "") or config.get("INGEST_DIR", "/books")
-    return Path(destination)
+    destination = config.get("DESTINATION", "", user_id=user_id) or config.get("INGEST_DIR", "/books")
+    return Path(
+        _expand_user_destination_placeholder(
+            str(destination),
+            user_id=user_id,
+            username=username,
+        )
+    )
 
 
 def get_aa_content_type_dir(content_type: Optional[str] = None) -> Optional[Path]:
@@ -191,6 +285,11 @@ def transform_cover_url(cover_url: Optional[str], cache_id: str) -> Optional[str
     if not is_covers_cache_enabled():
         return cover_url
 
+    from shelfmark.core.config import config as app_config
+
     # Encode the original URL and create a proxy URL
     encoded_url = base64.urlsafe_b64encode(cover_url.encode()).decode()
+    base_path = normalize_base_path(app_config.get("URL_BASE", ""))
+    if base_path:
+        return f"{base_path}/api/covers/{cache_id}?url={encoded_url}"
     return f"/api/covers/{cache_id}?url={encoded_url}"

shelfmark/download/clients/__init__.py

@@ -1,5 +1,5 @@
 """
-Download client infrastructure for Prowlarr integration.
+Shared download client infrastructure for external release sources.
 
 This module provides:
 - DownloadState: Enum of valid download states
@@ -423,9 +423,9 @@ def get_all_clients() -> Dict[str, List[Type[DownloadClient]]]:
 
 # Import client implementations to trigger registration
 # These imports are at the bottom to avoid circular imports
-from shelfmark.release_sources.prowlarr.clients import qbittorrent  # noqa: F401, E402
-from shelfmark.release_sources.prowlarr.clients import nzbget  # noqa: F401, E402
-from shelfmark.release_sources.prowlarr.clients import sabnzbd  # noqa: F401, E402
-from shelfmark.release_sources.prowlarr.clients import transmission  # noqa: F401, E402
-from shelfmark.release_sources.prowlarr.clients import deluge  # noqa: F401, E402
-from shelfmark.release_sources.prowlarr.clients import rtorrent  # noqa: F401, E402
+from shelfmark.download.clients import qbittorrent  # noqa: F401, E402
+from shelfmark.download.clients import nzbget  # noqa: F401, E402
+from shelfmark.download.clients import sabnzbd  # noqa: F401, E402
+from shelfmark.download.clients import transmission  # noqa: F401, E402
+from shelfmark.download.clients import deluge  # noqa: F401, E402
+from shelfmark.download.clients import rtorrent  # noqa: F401, E402

shelfmark/download/clients/base_handler.py

@@ -0,0 +1,753 @@
+"""Shared download handler for external torrent/usenet clients."""
+
+import shutil
+import time
+from abc import ABC, abstractmethod
+from dataclasses import dataclass
+from pathlib import Path
+from threading import Event
+from typing import Callable, Optional
+
+from shelfmark.core.config import config
+from shelfmark.core.logger import setup_logger
+from shelfmark.core.models import DownloadTask
+from shelfmark.core.utils import is_audiobook
+from shelfmark.download.clients import (
+    DownloadClient,
+    DownloadState,
+    get_client,
+    list_configured_clients,
+)
+from shelfmark.download.fs import run_blocking_io
+from shelfmark.release_sources import DownloadHandler
+
+logger = setup_logger(__name__)
+
+# How often to poll the download client for status (seconds)
+POLL_INTERVAL = 2
+# How long to wait for completed files to appear (seconds)
+COMPLETED_PATH_RETRY_INTERVAL = 5
+COMPLETED_PATH_MAX_ATTEMPTS = 12  # 12 attempts * 5s = 60s grace period
+
+
+@dataclass(frozen=True)
+class DownloadRequest:
+    """Source-specific download parameters resolved before sending to a client."""
+
+    url: str
+    protocol: str
+    release_name: str
+    expected_hash: Optional[str]
+
+
+def _diagnose_path_issue(path: str) -> str:
+    """
+    Analyze a path and return diagnostic hints for common issues.
+
+    Args:
+        path: The path that failed to be accessed
+
+    Returns:
+        A hint string to help users diagnose the issue.
+    """
+    # Detect Windows-style paths (won't work in Linux containers)
+    if len(path) >= 2 and path[1] == ':':
+        return (
+            f"Path '{path}' appears to be a Windows path. "
+            f"Shelfmark runs in Linux and cannot access Windows paths directly. "
+            f"Ensure your download client uses Linux-style paths (/path/to/files)."
+        )
+
+    # Detect backslashes (Windows path separators)
+    if "\\" in path:
+        return (
+            f"Path '{path}' contains backslashes. "
+            f"This may indicate a Windows path or incorrect path escaping. "
+            f"Linux paths should use forward slashes (/)."
+        )
+
+    # Generic hint for Linux paths
+    return (
+        f"Path '{path}' is not accessible from Shelfmark's container. "
+        f"Ensure both containers have matching volume mounts for this directory, "
+        f"or configure Remote Path Mappings in Settings > Advanced."
+    )
+
+
+class ExternalClientHandler(DownloadHandler, ABC):
+    """Shared lifecycle handler for sources that hand off to torrent/usenet clients."""
+
+    def __init__(self):
+        # Track downloads that may need client-side cleanup after Shelfmark completes import.
+        # task_id -> (client, download_id, protocol)
+        self._cleanup_refs: dict[str, tuple[DownloadClient, str, str]] = {}
+
+    @abstractmethod
+    def _resolve_download(
+        self,
+        task: DownloadTask,
+        status_callback: Callable[[str, Optional[str]], None],
+    ) -> Optional[DownloadRequest]:
+        """Resolve source-specific task metadata into a client download request."""
+
+    def _on_download_complete(self, task: DownloadTask) -> None:
+        """Hook called after successful completion; override for source cleanup."""
+        return
+
+    def _get_client(self, protocol: str) -> Optional[DownloadClient]:
+        """Resolve the active client for a protocol."""
+        return get_client(protocol)
+
+    def _list_configured_clients(self) -> list[str]:
+        """List protocols with configured clients."""
+        return list_configured_clients()
+
+    def _poll_interval(self) -> float:
+        """Polling interval for status checks (seconds)."""
+        return POLL_INTERVAL
+
+    def _completed_path_retry_interval(self) -> float:
+        """Retry interval while waiting for completed files (seconds)."""
+        return COMPLETED_PATH_RETRY_INTERVAL
+
+    def _completed_path_max_attempts(self) -> int:
+        """Maximum attempts when waiting for completed files."""
+        return COMPLETED_PATH_MAX_ATTEMPTS
+
+    def _get_category_for_task(self, client: DownloadClient, task: DownloadTask) -> Optional[str]:
+        """Get audiobook category if configured and applicable, else None for default."""
+        if not is_audiobook(task.content_type):
+            return None
+
+        # Client-specific audiobook category config keys
+        audiobook_keys = {
+            "qbittorrent": "QBITTORRENT_CATEGORY_AUDIOBOOK",
+            "transmission": "TRANSMISSION_CATEGORY_AUDIOBOOK",
+            "deluge": "DELUGE_CATEGORY_AUDIOBOOK",
+            "nzbget": "NZBGET_CATEGORY_AUDIOBOOK",
+            "sabnzbd": "SABNZBD_CATEGORY_AUDIOBOOK",
+        }
+        audiobook_key = audiobook_keys.get(client.name)
+        return config.get(audiobook_key, "") or None if audiobook_key else None
+
+    def post_process_cleanup(self, task: DownloadTask, success: bool) -> None:
+        if not success:
+            self._cleanup_refs.pop(task.task_id, None)
+            return
+
+        client_ref = self._cleanup_refs.pop(task.task_id, None)
+        if client_ref is None:
+            return
+
+        client, download_id, protocol = client_ref
+        if protocol != "usenet":
+            return
+
+        # "Move" means copy into ingest then let the usenet client delete its own files.
+        if config.get("PROWLARR_USENET_ACTION", "move") != "move":
+            return
+
+        try:
+            self._delete_local_download_data(client, download_id)
+            self._remove_usenet_download(client, download_id, delete_files=True, archive=True)
+        except Exception as e:
+            logger.warning(
+                f"Failed to cleanup usenet download {download_id} in {getattr(client, 'name', 'client')}: {e}"
+            )
+
+    def _remove_usenet_download(
+        self,
+        client: DownloadClient,
+        download_id: str,
+        *,
+        delete_files: bool,
+        archive: bool = True,
+    ) -> None:
+        """Remove a usenet download with SABnzbd-specific archive handling."""
+        if getattr(client, "name", "") == "sabnzbd":
+            client.remove(download_id, delete_files=delete_files, archive=archive)
+        else:
+            client.remove(download_id, delete_files=delete_files)
+
+    def _delete_local_download_data(self, client: DownloadClient, download_id: str) -> None:
+        """Best-effort local deletion of client download data."""
+        try:
+            raw_path = client.get_download_path(download_id)
+        except Exception as e:
+            logger.debug(f"Failed to resolve download path for {client.name} {download_id}: {e}")
+            return
+
+        if not raw_path:
+            logger.debug(f"No download path available for {client.name} {download_id}")
+            return
+
+        from shelfmark.core.path_mappings import (
+            get_client_host_identifier,
+            parse_remote_path_mappings,
+            remap_remote_to_local_with_match,
+        )
+
+        source_path_obj = Path(raw_path)
+        host = get_client_host_identifier(client) or ""
+        mapping_value = config.get("PROWLARR_REMOTE_PATH_MAPPINGS", [])
+        mappings = parse_remote_path_mappings(mapping_value)
+        remapped, matched_mapping = remap_remote_to_local_with_match(
+            mappings=mappings,
+            host=host,
+            remote_path=source_path_obj,
+        )
+
+        delete_path = remapped if matched_mapping else source_path_obj
+
+        if str(delete_path) in ("", "/"):
+            logger.warning(f"Refusing to delete unsafe path for {client.name} {download_id}: {delete_path}")
+            return
+
+        if not run_blocking_io(delete_path.exists):
+            logger.debug(f"Local download path does not exist for cleanup: {delete_path}")
+            return
+
+        try:
+            if run_blocking_io(delete_path.is_dir):
+                run_blocking_io(shutil.rmtree, delete_path)
+            else:
+                run_blocking_io(delete_path.unlink)
+            logger.info(f"Deleted local download data for {client.name} {download_id}: {delete_path}")
+        except Exception as e:
+            logger.warning(f"Failed to delete local download data for {client.name} {download_id}: {e}")
+
+    def _safe_remove_download(self, client, download_id: str, protocol: str, reason: str) -> None:
+        """Best-effort removal of a failed/cancelled download from the client.
+
+        Safety policy:
+        - torrents: never remove or delete client data (avoid breaking seeding)
+        - usenet: keep legacy behavior (delete client files on removal)
+        """
+
+        if protocol != "usenet":
+            logger.info(
+                "Skipping download client cleanup for protocol=%s after %s (client=%s id=%s)",
+                protocol,
+                reason,
+                getattr(client, "name", "client"),
+                download_id,
+            )
+            return
+
+        try:
+            # Permanent delete for failed usenet downloads (SABnzbd archive=0).
+            self._delete_local_download_data(client, download_id)
+            self._remove_usenet_download(client, download_id, delete_files=True, archive=False)
+        except Exception as e:
+            logger.warning(
+                f"Failed to remove download {download_id} from {client.name} after {reason}: {e}"
+            )
+
+    def _handle_cancelled_download(
+        self,
+        client: DownloadClient,
+        download_id: str,
+        protocol: str,
+        status_callback: Callable[[str, Optional[str]], None],
+    ) -> None:
+        if protocol == "usenet":
+            logger.info(f"Download cancelled, removing from {client.name}: {download_id}")
+            try:
+                self._delete_local_download_data(client, download_id)
+                self._remove_usenet_download(client, download_id, delete_files=True, archive=True)
+            except Exception as e:
+                logger.warning(
+                    f"Failed to remove download {download_id} from {client.name} after cancellation: {e}"
+                )
+        else:
+            logger.info(
+                f"Download cancelled for protocol={protocol}; leaving in {client.name}: {download_id}"
+            )
+        status_callback("cancelled", "Cancelled")
+
+    def _resolve_download_path_once(
+        self,
+        client: DownloadClient,
+        download_id: str,
+        *,
+        log_details: bool,
+    ) -> tuple[Optional[Path], Optional[str]]:
+        """Resolve and validate the completed download path once."""
+        try:
+            raw_path = client.get_download_path(download_id)
+        except Exception as e:
+            message = (
+                f"Could not locate completed download in {client.name} (path not returned). "
+                f"Check volume mappings and category settings."
+            )
+            if log_details:
+                logger.error(
+                    f"Failed to resolve download path for {client.name} {download_id}: {e}"
+                )
+            else:
+                logger.debug(
+                    f"Failed to resolve download path for {client.name} {download_id}: {e}"
+                )
+            return None, message
+
+        if not raw_path:
+            message = (
+                f"Could not locate completed download in {client.name} (path not returned). "
+                f"Check volume mappings and category settings."
+            )
+            if log_details:
+                logger.error(f"Download client returned empty path for {client.name} {download_id}")
+            else:
+                logger.debug(f"Download client returned empty path for {client.name} {download_id}")
+            return None, message
+
+        from shelfmark.core.path_mappings import (
+            get_client_host_identifier,
+            parse_remote_path_mappings,
+            remap_remote_to_local_with_match,
+        )
+
+        source_path_obj = Path(raw_path)
+        host = get_client_host_identifier(client) or ""
+        mapping_value = config.get("PROWLARR_REMOTE_PATH_MAPPINGS", [])
+        mappings = parse_remote_path_mappings(mapping_value)
+
+        if log_details:
+            logger.debug(
+                "Attempting path remap: client=%s, host=%s, path=%s, mappings=%s",
+                client.name,
+                host,
+                source_path_obj,
+                [(m.host, m.remote_path, m.local_path) for m in mappings],
+            )
+
+        remapped, matched_mapping = remap_remote_to_local_with_match(
+            mappings=mappings,
+            host=host,
+            remote_path=source_path_obj,
+        )
+
+        if log_details:
+            remapped_exists = run_blocking_io(remapped.exists)
+            logger.debug(
+                "Remap result: %s -> %s (exists=%s, changed=%s, matched=%s)",
+                source_path_obj,
+                remapped,
+                remapped_exists,
+                remapped != source_path_obj,
+                matched_mapping,
+            )
+
+        if matched_mapping:
+            if run_blocking_io(remapped.exists):
+                logger.info(
+                    "Remapped download path for %s (%s): %s -> %s",
+                    client.name,
+                    download_id,
+                    source_path_obj,
+                    remapped,
+                )
+                return remapped, None
+
+            message = (
+                f"Remapped path '{remapped}' does not exist. "
+                f"Check your Docker volume mounts match the Local Path in Settings > Advanced > Remote Path Mappings."
+            )
+            if log_details:
+                logger.error(
+                    f"Download path does not exist after remapping: {raw_path} -> {remapped}. "
+                    f"Client: {client.name}, ID: {download_id}."
+                )
+            else:
+                logger.debug(
+                    f"Download path does not exist after remapping: {raw_path} -> {remapped}. "
+                    f"Client: {client.name}, ID: {download_id}."
+                )
+            return None, message
+
+        if mappings:
+            if run_blocking_io(source_path_obj.exists):
+                logger.info(
+                    "No remote path mapping matched for %s (%s); using client path: %s",
+                    client.name,
+                    download_id,
+                    source_path_obj,
+                )
+                return source_path_obj, None
+
+            hint = _diagnose_path_issue(raw_path)
+            message = f"{hint} No remote path mapping matched for client '{client.name}'."
+            if log_details:
+                logger.error(
+                    f"Download path does not exist and no remote path mapping matched for {client.name} "
+                    f"({download_id}): {raw_path}. {hint}"
+                )
+            else:
+                logger.debug(
+                    f"Download path does not exist and no remote path mapping matched for {client.name} "
+                    f"({download_id}): {raw_path}. {hint}"
+                )
+            return None, message
+
+        if not run_blocking_io(source_path_obj.exists):
+            hint = _diagnose_path_issue(raw_path)
+            message = hint
+            if log_details:
+                logger.error(
+                    f"Download path does not exist: {raw_path}. "
+                    f"Client: {client.name}, ID: {download_id}. {hint}"
+                )
+            else:
+                logger.debug(
+                    f"Download path does not exist: {raw_path}. "
+                    f"Client: {client.name}, ID: {download_id}. {hint}"
+                )
+            return None, message
+
+        return source_path_obj, None
+
+    def _wait_for_completed_path(
+        self,
+        client: DownloadClient,
+        download_id: str,
+        *,
+        cancel_flag: Optional[Event],
+        status_callback: Callable[[str, Optional[str]], None],
+    ) -> tuple[Optional[Path], Optional[str]]:
+        """Wait briefly for completed files to appear on disk."""
+        last_error: Optional[str] = None
+        max_attempts = self._completed_path_max_attempts()
+        retry_interval = self._completed_path_retry_interval()
+
+        for attempt in range(1, max_attempts + 1):
+            if cancel_flag and cancel_flag.is_set():
+                return None, last_error
+
+            log_details = attempt == max_attempts
+            resolved_path, error = self._resolve_download_path_once(
+                client,
+                download_id,
+                log_details=log_details,
+            )
+            if resolved_path:
+                return resolved_path, None
+
+            last_error = error
+
+            if attempt < max_attempts:
+                status_callback("locating", "Waiting for completed files...")
+                logger.debug(
+                    "Completed files not available yet for %s (%s) (attempt %d/%d)",
+                    client.name,
+                    download_id,
+                    attempt,
+                    max_attempts,
+                )
+
+                if cancel_flag:
+                    if cancel_flag.wait(timeout=retry_interval):
+                        return None, last_error
+                else:
+                    time.sleep(retry_interval)
+
+        return None, last_error
+
+    def _build_progress_message(self, status) -> str:
+        """Build a progress message from download status."""
+        msg = f"{status.progress:.0f}%"
+
+        if status.download_speed and status.download_speed > 0:
+            speed_mb = status.download_speed / 1024 / 1024
+            msg += f" ({speed_mb:.1f} MB/s)"
+
+        if status.eta and status.eta > 0:
+            if status.eta < 60:
+                msg += f" - {status.eta}s left"
+            elif status.eta < 3600:
+                msg += f" - {status.eta // 60}m left"
+            else:
+                msg += f" - {status.eta // 3600}h {(status.eta % 3600) // 60}m left"
+
+        return msg
+
+    def download(
+        self,
+        task: DownloadTask,
+        cancel_flag: Event,
+        progress_callback: Callable[[float], None],
+        status_callback: Callable[[str, Optional[str]], None],
+    ) -> Optional[str]:
+        """Execute download via configured torrent/usenet client. Returns file path or None."""
+        try:
+            if cancel_flag.is_set():
+                status_callback("cancelled", "Cancelled")
+                return None
+
+            request = self._resolve_download(task, status_callback)
+            if not request:
+                return None
+
+            client = self._get_client(request.protocol)
+            if not client:
+                configured = self._list_configured_clients()
+                if not configured:
+                    status_callback(
+                        "error",
+                        "No download clients configured. Configure qBittorrent or NZBGet in settings.",
+                    )
+                else:
+                    status_callback("error", f"No {request.protocol} client configured")
+                return None
+
+            # Check if this download already exists in the client
+            status_callback("resolving", f"Checking {client.name}")
+            category = self._get_category_for_task(client, task)
+            existing = client.find_existing(request.url, category=category)
+
+            if existing:
+                download_id, existing_status = existing
+                logger.info(f"Found existing download in {client.name}: {download_id}")
+
+                # If already complete, skip straight to file handling
+                if existing_status.complete:
+                    logger.info("Existing download is complete, copying file directly")
+                    status_callback("resolving", "Found existing download, copying to library")
+
+                    source_path_obj, path_error = self._wait_for_completed_path(
+                        client=client,
+                        download_id=download_id,
+                        cancel_flag=cancel_flag,
+                        status_callback=status_callback,
+                    )
+                    if not source_path_obj:
+                        if cancel_flag.is_set():
+                            return None
+                        status_callback(
+                            "error",
+                            path_error
+                            or f"Could not locate existing download in {client.name}. Check that the file still exists.",
+                        )
+                        return None
+
+                    result = self._handle_completed_file(
+                        source_path=source_path_obj,
+                        protocol=request.protocol,
+                        task=task,
+                        status_callback=status_callback,
+                    )
+
+                    if result:
+                        self._on_download_complete(task)
+                        self._cleanup_refs[task.task_id] = (client, download_id, request.protocol)
+                    return result
+
+                # Existing but still downloading - join the progress polling
+                logger.info("Existing download in progress, joining poll loop")
+                status_callback("downloading", "Resuming existing download")
+            else:
+                # No existing download - add new
+                status_callback("resolving", f"Sending to {client.name}")
+                try:
+                    download_id = client.add_download(
+                        url=request.url,
+                        name=request.release_name,
+                        category=category,
+                        expected_hash=request.expected_hash,
+                    )
+                except Exception as e:
+                    logger.error(f"Failed to add to {client.name}: {e}")
+                    status_callback("error", f"Failed to add to {client.name}: {e}")
+                    return None
+
+                logger.info(f"Added to {client.name}: {download_id} for '{request.release_name}'")
+
+            # Poll for progress
+            return self._poll_and_complete(
+                client=client,
+                download_id=download_id,
+                protocol=request.protocol,
+                task=task,
+                cancel_flag=cancel_flag,
+                progress_callback=progress_callback,
+                status_callback=status_callback,
+            )
+
+        except Exception as e:
+            logger.error(f"External client download error: {e}")
+            status_callback("error", str(e))
+            return None
+
+    def _poll_and_complete(
+        self,
+        client: DownloadClient,
+        download_id: str,
+        protocol: str,
+        task: DownloadTask,
+        cancel_flag: Event,
+        progress_callback: Callable[[float], None],
+        status_callback: Callable[[str, Optional[str]], None],
+    ) -> Optional[str]:
+        """Poll the download client for progress and handle completion."""
+        poll_interval = self._poll_interval()
+        # Track consecutive "not found" errors - torrents may take time to appear in client
+        not_found_count = 0
+        max_not_found_retries = 15  # 15 retries * poll interval ~= 30s grace period
+
+        try:
+            logger.debug(f"Starting poll for {download_id} (content_type={task.content_type})")
+            while not cancel_flag.is_set():
+                status = client.get_status(download_id)
+                progress_callback(status.progress)
+
+                # Check for completion
+                if status.complete:
+                    if status.state == DownloadState.ERROR:
+                        logger.error(f"Download {download_id} completed with error: {status.message}")
+                        status_callback("error", status.message or "Download failed")
+                        self._safe_remove_download(client, download_id, protocol, "completion error")
+                        return None
+                    # Download complete - break to handle file
+                    logger.debug(f"Download {download_id} complete, file_path={status.file_path}")
+                    break
+
+                # Check for error state
+                if status.state == DownloadState.ERROR:
+                    message = (status.message or "").strip()
+                    message_lower = message.lower()
+
+                    # Only treat *actual* "not found" as retryable.
+                    # qBittorrent auth/network/API failures should surface immediately (more actionable)
+                    # and must not be confused with "torrent missing".
+                    retryable_not_found = any(
+                        token in message_lower
+                        for token in (
+                            "torrent not found",
+                            "not found in qbittorrent",
+                            "download not found",
+                        )
+                    )
+
+                    non_retryable = any(
+                        token in message_lower
+                        for token in (
+                            "authentication failed",
+                            "cannot connect",
+                            "timed out",
+                            "api request failed",
+                        )
+                    )
+
+                    if retryable_not_found and not non_retryable:
+                        not_found_count += 1
+                        if not_found_count < max_not_found_retries:
+                            logger.debug(
+                                f"Download {download_id} not yet visible in client "
+                                f"(attempt {not_found_count}/{max_not_found_retries})"
+                            )
+                            status_callback("resolving", "Waiting for download client...")
+                            if cancel_flag.wait(timeout=poll_interval):
+                                break
+                            continue
+
+                        logger.error(
+                            f"Download {download_id} not found after {max_not_found_retries} attempts"
+                        )
+                    else:
+                        # Fail fast on actionable errors (auth, connectivity, API issues)
+                        logger.error(f"Download {download_id} error state: {status.message}")
+
+                    status_callback("error", status.message or "Download failed")
+                    self._safe_remove_download(client, download_id, protocol, "download error")
+                    return None
+
+                # Reset not-found counter on successful status check
+                not_found_count = 0
+
+                # Build status message - use client message if provided, else build progress
+                msg = status.message or self._build_progress_message(status)
+                if status.state == DownloadState.PROCESSING:
+                    # Post-processing (e.g., SABnzbd verifying/extracting)
+                    status_callback("resolving", msg)
+                else:
+                    status_callback("downloading", msg)
+
+                # Wait for next poll (interruptible by cancel)
+                if cancel_flag.wait(timeout=poll_interval):
+                    break
+
+            # Handle cancellation
+            if cancel_flag.is_set():
+                self._handle_cancelled_download(client, download_id, protocol, status_callback)
+                return None
+
+            # Handle completed file (wait briefly for files to appear)
+            source_path_obj, path_error = self._wait_for_completed_path(
+                client=client,
+                download_id=download_id,
+                cancel_flag=cancel_flag,
+                status_callback=status_callback,
+            )
+            if not source_path_obj:
+                if cancel_flag.is_set():
+                    self._handle_cancelled_download(client, download_id, protocol, status_callback)
+                    return None
+                status_callback(
+                    "error",
+                    path_error
+                    or f"Could not locate completed download in {client.name} (path not returned). Check volume mappings and category settings.",
+                )
+                return None
+
+            result = self._handle_completed_file(
+                source_path=source_path_obj,
+                protocol=protocol,
+                task=task,
+                status_callback=status_callback,
+            )
+
+            # Clean up on success
+            if result:
+                self._on_download_complete(task)
+                self._cleanup_refs[task.task_id] = (client, download_id, protocol)
+
+            return result
+
+        except Exception as e:
+            logger.error(f"Error during download polling: {e}")
+            status_callback("error", str(e))
+            self._safe_remove_download(client, download_id, protocol, "polling exception")
+            return None
+
+    def _handle_completed_file(
+        self,
+        source_path: Path,
+        protocol: str,
+        task: DownloadTask,
+        status_callback: Callable[[str, Optional[str]], None],
+    ) -> Optional[str]:
+        """Handle a completed download and return its path.
+
+        For external download clients (torrents/usenet), staging large payloads into TMP_DIR
+        is expensive (and can duplicate multi-GB files). Instead, return the client's
+        completed path and let the orchestrator perform any required transfer (copy/move/
+        hardlink) directly from that source.
+
+        Torrents also set ``task.original_download_path`` so the orchestrator can detect
+        seeding data and enable hardlinking when configured.
+        """
+        try:
+            if protocol == "torrent":
+                task.original_download_path = str(source_path)
+
+            logger.debug(f"Download complete, returning original path: {source_path}")
+            return str(source_path)
+
+        except Exception as e:
+            logger.error(f"Failed to finalize completed download at {source_path}: {e}")
+            status_callback("error", f"Failed to finalize completed download: {e}")
+            return None
+
+    def cancel(self, task_id: str) -> bool:
+        """Default cancellation (primary cancellation happens via cancel_flag)."""
+        logger.debug(f"Cancel requested for external client task: {task_id}")
+        return True

shelfmark/download/clients/deluge.py

@@ -18,14 +18,15 @@ from urllib.parse import urlparse
 import requests
 
 from shelfmark.core.config import config
+from shelfmark.download.network import get_ssl_verify
 from shelfmark.core.logger import setup_logger
 from shelfmark.core.utils import normalize_http_url
-from shelfmark.release_sources.prowlarr.clients import (
+from shelfmark.download.clients import (
     DownloadClient,
     DownloadStatus,
     register_client,
 )
-from shelfmark.release_sources.prowlarr.clients.torrent_utils import (
+from shelfmark.download.clients.torrent_utils import (
     extract_torrent_info,
 )
 
@@ -97,6 +98,7 @@ class DelugeClient(DownloadClient):
         self._rpc_id = 0
 
         self._category = str(config.get("DELUGE_CATEGORY", "books") or "books")
+        self._download_dir = str(config.get("DELUGE_DOWNLOAD_DIR", "") or "")
 
     def _next_rpc_id(self) -> int:
         self._rpc_id += 1
@@ -109,7 +111,7 @@ class DelugeClient(DownloadClient):
             "params": list(params),
         }
 
-        response = self._session.post(self._rpc_url, json=payload, timeout=timeout)
+        response = self._session.post(self._rpc_url, json=payload, timeout=timeout, verify=get_ssl_verify(self._rpc_url))
         response.raise_for_status()
 
         data = response.json()
@@ -232,6 +234,8 @@ class DelugeClient(DownloadClient):
                 raise Exception("Failed to fetch torrent file")
 
             options: dict[str, Any] = {}
+            if self._download_dir:
+                options["download_location"] = self._download_dir
 
             if torrent_info.is_magnet:
                 magnet_url = torrent_info.magnet_url or url

shelfmark/download/clients/nzbget.py

@@ -12,7 +12,8 @@ import requests
 from shelfmark.core.config import config
 from shelfmark.core.logger import setup_logger
 from shelfmark.core.utils import normalize_http_url
-from shelfmark.release_sources.prowlarr.clients import (
+from shelfmark.download.network import get_ssl_verify
+from shelfmark.download.clients import (
     DownloadClient,
     DownloadStatus,
     register_client,
@@ -79,6 +80,7 @@ class NZBGetClient(DownloadClient):
             headers={"Content-Type": "application/json"},
             auth=(self.username, self.password),
             timeout=30,
+            verify=get_ssl_verify(rpc_url),
         )
         response.raise_for_status()
 
@@ -135,7 +137,7 @@ class NZBGetClient(DownloadClient):
         try:
             # Fetch NZB content from the URL (handles Prowlarr proxy redirects)
             logger.debug(f"Fetching NZB from: {url}")
-            response = requests.get(url, timeout=30)
+            response = requests.get(url, timeout=30, verify=get_ssl_verify(url))
             response.raise_for_status()
             nzb_content = base64.b64encode(response.content).decode('ascii')
 

shelfmark/download/clients/qbittorrent.py

@@ -7,12 +7,13 @@ from typing import Optional, Tuple
 from shelfmark.core.config import config
 from shelfmark.core.logger import setup_logger
 from shelfmark.core.utils import normalize_http_url
-from shelfmark.release_sources.prowlarr.clients import (
+from shelfmark.download.network import get_ssl_verify
+from shelfmark.download.clients import (
     DownloadClient,
     DownloadStatus,
     register_client,
 )
-from shelfmark.release_sources.prowlarr.clients.torrent_utils import (
+from shelfmark.download.clients.torrent_utils import (
     extract_torrent_info,
 )
 
@@ -31,6 +32,35 @@ def _hashes_match(hash1: str, hash2: str) -> bool:
     return False
 
 
+def _normalize_tags(raw_tags: object) -> list[str]:
+    """Normalize tag input to a clean, de-duplicated list of strings."""
+    if raw_tags is None:
+        return []
+
+    if isinstance(raw_tags, str):
+        parts = [part.strip() for part in raw_tags.split(",")]
+    elif isinstance(raw_tags, (list, tuple, set)):
+        parts = []
+        for item in raw_tags:
+            if item is None:
+                continue
+            parts.append(str(item).strip())
+    else:
+        parts = [str(raw_tags).strip()] if raw_tags else []
+
+    tags: list[str] = []
+    seen = set()
+    for part in parts:
+        if not part:
+            continue
+        if part in seen:
+            continue
+        seen.add(part)
+        tags.append(part)
+
+    return tags
+
+
 @register_client("torrent")
 class QBittorrentClient(DownloadClient):
     """qBittorrent download client."""
@@ -107,8 +137,11 @@ class QBittorrentClient(DownloadClient):
             host=self._base_url,
             username=config.get("QBITTORRENT_USERNAME", ""),
             password=config.get("QBITTORRENT_PASSWORD", ""),
+            VERIFY_WEBUI_CERTIFICATE=get_ssl_verify(self._base_url),
         )
         self._category = config.get("QBITTORRENT_CATEGORY", "books")
+        self._download_dir = config.get("QBITTORRENT_DOWNLOAD_DIR", "")
+        self._tags = _normalize_tags(config.get("QBITTORRENT_TAG", []))
 
 
     def _get_torrents_info(
@@ -255,6 +288,7 @@ class QBittorrentClient(DownloadClient):
         try:
             # Use configured category if not explicitly provided
             category = category or self._category
+            tags = self._tags
 
             # Ensure category exists (may already exist, which is fine)
             try:
@@ -270,19 +304,26 @@ class QBittorrentClient(DownloadClient):
             torrent_data = torrent_info.torrent_data
 
             # Add the torrent - use file content if we have it, otherwise URL
+            add_kwargs = {
+                "category": category,
+                "rename": name,
+            }
+            if self._download_dir:
+                add_kwargs["save_path"] = self._download_dir
+            if tags:
+                add_kwargs["tags"] = ",".join(tags)
+
             if torrent_data:
                 result = self._client.torrents_add(
                     torrent_files=torrent_data,
-                    category=category,
-                    rename=name,
+                    **add_kwargs,
                 )
             else:
                 # Use magnet URL if available, otherwise original URL
                 add_url = torrent_info.magnet_url or url
                 result = self._client.torrents_add(
                     urls=add_url,
-                    category=category,
-                    rename=name,
+                    **add_kwargs,
                 )
 
             logger.debug(f"qBittorrent add result: {result}")

shelfmark/download/clients/rtorrent.py

@@ -4,24 +4,41 @@ rTorrent download client for Prowlarr integration.
 Uses xmlrpc to communicate with rTorrent's RPC interface.
 """
 
-from typing import Optional, Tuple
+import ssl
+from typing import Any, Optional, Tuple
 from urllib.parse import urlparse
 
 from shelfmark.core.config import config
 from shelfmark.core.logger import setup_logger
-from shelfmark.core.utils import normalize_http_url
-from shelfmark.release_sources.prowlarr.clients import (
+from shelfmark.core.utils import normalize_http_url, get_hardened_xmlrpc_client
+from shelfmark.download.network import get_ssl_verify
+from shelfmark.download.clients import (
     DownloadClient,
     DownloadStatus,
     register_client,
 )
-from shelfmark.release_sources.prowlarr.clients.torrent_utils import (
+from shelfmark.download.clients.torrent_utils import (
     extract_torrent_info,
 )
 
 logger = setup_logger(__name__)
 
 
+def _create_rtorrent_server_proxy(url: str) -> Any:
+    """Create an XML-RPC ServerProxy honoring certificate validation mode."""
+    xmlrpc_client = get_hardened_xmlrpc_client()
+
+    verify = get_ssl_verify(url)
+    if url.startswith("https://") and not verify:
+        ssl_context = ssl.create_default_context()
+        ssl_context.check_hostname = False
+        ssl_context.verify_mode = ssl.CERT_NONE
+        transport = xmlrpc_client.SafeTransport(context=ssl_context)
+        return xmlrpc_client.ServerProxy(url, transport=transport)
+
+    return xmlrpc_client.ServerProxy(url)
+
+
 @register_client("torrent")
 class RTorrentClient(DownloadClient):
     """rTorrent download client using xmlrpc."""
@@ -31,8 +48,6 @@ class RTorrentClient(DownloadClient):
 
     def __init__(self):
         """Initialize rTorrent client with settings from config."""
-        from xmlrpc.client import ServerProxy
-
         raw_url = config.get("RTORRENT_URL", "")
         if not raw_url:
             raise ValueError("RTORRENT_URL is required")
@@ -50,7 +65,7 @@ class RTorrentClient(DownloadClient):
                 f"{parsed.scheme}://{username}:{password}@{parsed.netloc}{parsed.path}"
             )
 
-        self._rpc = ServerProxy(self._base_url)
+        self._rpc = _create_rtorrent_server_proxy(self._base_url)
         self._download_dir = config.get("RTORRENT_DOWNLOAD_DIR", "")
         self._label = config.get("RTORRENT_LABEL", "")
 
@@ -105,7 +120,7 @@ class RTorrentClient(DownloadClient):
             download_dir = self._download_dir or self._get_download_dir()
             if download_dir:
                 logger.debug(f"Setting rTorrent download directory: {download_dir}")
-                commands.append(f"d.directory_base.set={download_dir}")
+                commands.append(f"d.directory.set={download_dir}")
 
             if torrent_info.torrent_data:
                 logger.debug(f"Adding torrent data directly to rTorrent for: {name} with commands: {commands} with data size: {len(torrent_info.torrent_data)}")
@@ -141,10 +156,9 @@ class RTorrentClient(DownloadClient):
         try:
             # rtorrent is somehow case sensitive and requires uppercase hashes for look
             download_id = download_id.upper()
-            torrent_list = self._rpc.d.multicall.filtered(
+            all_torrents = self._rpc.d.multicall2(
+                "",
                 "",
-                "default",
-                f"equal={{d.hash=,cat={download_id}}}",
                 "d.hash=",
                 "d.state=",
                 "d.completed_bytes=",
@@ -154,6 +168,7 @@ class RTorrentClient(DownloadClient):
                 "d.custom1=",
                 "d.complete=",
             )
+            torrent_list = [t for t in all_torrents if t and t[0] == download_id]
             logger.debug(f"Fetched torrent status from rTorrent for: {download_id} - {torrent_list}")
             if not torrent_list:
                 logger.warning(f"Torrent not found in rTorrent: {download_id}")
@@ -310,7 +325,18 @@ class RTorrentClient(DownloadClient):
         this corresponds to `d.get_base_path()`.
         """
         try:
-            base_path = self._rpc.d.get_base_path(download_id)
-            return base_path if base_path else None
+            # rTorrent is case sensitive for hashes; use uppercase as in get_status()
+            download_hash = download_id.upper()
+            all_torrents = self._rpc.d.multicall2(
+                "",
+                "",
+                "d.hash=",
+                "d.base_path=",
+            )
+            details = [t[1:] for t in all_torrents if t and t[0] == download_hash]
+            if not details:
+                return None
+            path = details[0][0]
+            return path if path else None
         except Exception:
             return None

shelfmark/download/clients/sabnzbd.py

@@ -12,7 +12,8 @@ import requests
 from shelfmark.core.config import config
 from shelfmark.core.logger import setup_logger
 from shelfmark.core.utils import normalize_http_url
-from shelfmark.release_sources.prowlarr.clients import (
+from shelfmark.download.network import get_ssl_verify
+from shelfmark.download.clients import (
     DownloadClient,
     DownloadStatus,
     register_client,
@@ -148,7 +149,7 @@ class SABnzbdClient(DownloadClient):
         if params:
             request_params.update(params)
 
-        response = requests.get(api_url, params=request_params, timeout=30)
+        response = requests.get(api_url, params=request_params, timeout=30, verify=get_ssl_verify(api_url))
         response.raise_for_status()
 
         result = response.json()
@@ -177,7 +178,7 @@ class SABnzbdClient(DownloadClient):
         }
         files = {"name": (filename, nzb_content, "application/x-nzb")}
 
-        response = requests.post(api_url, params=request_params, files=files, timeout=30)
+        response = requests.post(api_url, params=request_params, files=files, timeout=30, verify=get_ssl_verify(api_url))
         response.raise_for_status()
         result = response.json()
 
@@ -190,11 +191,12 @@ class SABnzbdClient(DownloadClient):
     def _fetch_nzb_content(self, url: str) -> bytes:
         """Fetch NZB content, including Prowlarr auth headers when appropriate."""
         headers = self._get_prowlarr_headers(url)
-        response = requests.get(url, timeout=30, headers=headers)
+        response = requests.get(url, timeout=30, headers=headers, verify=get_ssl_verify(url))
         response.raise_for_status()
         return response.content
 
     def _get_prowlarr_headers(self, url: str) -> dict:
+        # TODO: Move this source-specific Prowlarr auth handling into a source hook.
         api_key = str(config.get("PROWLARR_API_KEY", "") or "").strip()
         if not api_key:
             return {}

shelfmark/download/clients/settings.py

@@ -0,0 +1,730 @@
+"""Shared download client settings registration."""
+
+from contextlib import contextmanager
+from typing import Any, Dict, Optional
+
+from shelfmark.core.settings_registry import (
+    register_settings,
+    HeadingField,
+    TextField,
+    PasswordField,
+    ActionButton,
+    SelectField,
+    TagListField,
+)
+from shelfmark.core.utils import normalize_http_url, get_hardened_xmlrpc_client
+from shelfmark.download.network import get_ssl_verify
+
+
+# ==================== Test Connection Callbacks ====================
+
+@contextmanager
+def _transmission_session_verify_override(url: str):
+    """Ensure transmission-rpc constructor uses the configured TLS verify mode."""
+    verify = get_ssl_verify(url)
+    if verify:
+        yield
+        return
+
+    try:
+        import transmission_rpc.client as transmission_rpc_client
+    except Exception:
+        yield
+        return
+
+    original_session_factory = transmission_rpc_client.requests.Session
+
+    def _session_factory(*args: Any, **kwargs: Any) -> Any:
+        session = original_session_factory(*args, **kwargs)
+        session.verify = False
+        return session
+
+    transmission_rpc_client.requests.Session = _session_factory
+    try:
+        yield
+    finally:
+        transmission_rpc_client.requests.Session = original_session_factory
+
+
+def _test_qbittorrent_connection(current_values: Optional[Dict[str, Any]] = None) -> Dict[str, Any]:
+    """Test the qBittorrent connection using current form values."""
+    from shelfmark.core.config import config
+
+    current_values = current_values or {}
+
+    raw_url = current_values.get("QBITTORRENT_URL") or config.get("QBITTORRENT_URL", "")
+    username = current_values.get("QBITTORRENT_USERNAME") or config.get("QBITTORRENT_USERNAME", "")
+    password = current_values.get("QBITTORRENT_PASSWORD") or config.get("QBITTORRENT_PASSWORD", "")
+
+    if not raw_url:
+        return {"success": False, "message": "qBittorrent URL is required"}
+
+    try:
+        from qbittorrentapi import Client
+
+        url = normalize_http_url(raw_url)
+        if not url:
+            return {"success": False, "message": "qBittorrent URL is invalid"}
+
+        client = Client(host=url, username=username, password=password, VERIFY_WEBUI_CERTIFICATE=get_ssl_verify(url))
+        client.auth_log_in()
+        api_version = client.app.web_api_version
+        return {"success": True, "message": f"Connected to qBittorrent (API v{api_version})"}
+    except ImportError:
+        return {"success": False, "message": "qbittorrent-api package not installed"}
+    except Exception as e:
+        return {"success": False, "message": f"Connection failed: {str(e)}"}
+
+
+def _test_transmission_connection(current_values: Optional[Dict[str, Any]] = None) -> Dict[str, Any]:
+    """Test the Transmission connection using current form values."""
+    from shelfmark.core.config import config
+    from shelfmark.download.clients.torrent_utils import (
+        parse_transmission_url,
+    )
+
+    current_values = current_values or {}
+
+    raw_url = current_values.get("TRANSMISSION_URL") or config.get("TRANSMISSION_URL", "")
+    username = current_values.get("TRANSMISSION_USERNAME") or config.get("TRANSMISSION_USERNAME", "")
+    password = current_values.get("TRANSMISSION_PASSWORD") or config.get("TRANSMISSION_PASSWORD", "")
+
+    if not raw_url:
+        return {"success": False, "message": "Transmission URL is required"}
+
+    url = normalize_http_url(raw_url)
+    if not url:
+        return {"success": False, "message": "Transmission URL is invalid"}
+
+    try:
+        from transmission_rpc import Client
+
+        # Parse URL to extract host, port, and path
+        protocol, host, port, path = parse_transmission_url(url)
+
+        client_kwargs = {
+            "host": host,
+            "port": port,
+            "path": path,
+            "username": username if username else None,
+            "password": password if password else None,
+            "protocol": protocol,
+        }
+        try:
+            with _transmission_session_verify_override(url):
+                client = Client(**client_kwargs)
+        except TypeError as e:
+            if "protocol" not in str(e):
+                raise
+            client_kwargs.pop("protocol", None)
+            with _transmission_session_verify_override(url):
+                client = Client(**client_kwargs)
+            if protocol == "https" and hasattr(client, "protocol"):
+                try:
+                    setattr(client, "protocol", protocol)
+                except Exception:
+                    pass
+
+        # Keep session verify aligned for subsequent calls beyond constructor bootstrap.
+        http_session = getattr(client, "_http_session", None)
+        if http_session is not None:
+            http_session.verify = get_ssl_verify(url)
+
+        session = client.get_session()
+        version = session.version
+        return {"success": True, "message": f"Connected to Transmission {version}"}
+    except ImportError:
+        return {"success": False, "message": "transmission-rpc package not installed"}
+    except Exception as e:
+        return {"success": False, "message": f"Connection failed: {str(e)}"}
+
+
+def _test_deluge_connection(current_values: Optional[Dict[str, Any]] = None) -> Dict[str, Any]:
+    """Test Deluge Web UI JSON-RPC connection using current form values."""
+    from urllib.parse import urlparse
+
+    import requests
+    from shelfmark.core.config import config
+
+    current_values = current_values or {}
+
+    raw_host = current_values.get("DELUGE_HOST") or config.get("DELUGE_HOST", "localhost")
+    raw_port = current_values.get("DELUGE_PORT") or config.get("DELUGE_PORT", "8112")
+    password = current_values.get("DELUGE_PASSWORD") or config.get("DELUGE_PASSWORD", "")
+
+    if not raw_host:
+        return {"success": False, "message": "Deluge host is required"}
+    if not password:
+        return {"success": False, "message": "Deluge password is required"}
+
+    raw_host = str(raw_host)
+    raw_host = normalize_http_url(raw_host, strip_trailing_slash=False) if raw_host else ""
+    if not raw_host:
+        return {"success": False, "message": "Deluge host is invalid"}
+
+    raw_port = str(raw_port or "8112")
+
+    scheme = "http"
+    base_path = ""
+    host = raw_host
+    port = int(raw_port) if raw_port.isdigit() else 8112
+
+    # Allow DELUGE_HOST to be a full URL (e.g. http://deluge:8112)
+    if raw_host.startswith(("http://", "https://")):
+        parsed = urlparse(raw_host)
+        scheme = parsed.scheme or "http"
+        host = parsed.hostname or "localhost"
+        if parsed.port is not None:
+            port = parsed.port
+        base_path = (parsed.path or "").rstrip("/")
+    else:
+        # Allow "host:port" in DELUGE_HOST for convenience.
+        if ":" in raw_host and raw_host.count(":") == 1:
+            host_part, port_part = raw_host.split(":", 1)
+            if host_part and port_part.isdigit():
+                host = host_part
+                port = int(port_part)
+
+    rpc_url = f"{scheme}://{host}:{port}{base_path}/json"
+
+    def rpc_call(session: requests.Session, rpc_id: int, method: str, *params: Any) -> Any:
+        payload = {"id": rpc_id, "method": method, "params": list(params)}
+        resp = session.post(rpc_url, json=payload, timeout=15, verify=get_ssl_verify(rpc_url))
+        resp.raise_for_status()
+        data = resp.json()
+        if data.get("error"):
+            error = data["error"]
+            if isinstance(error, dict):
+                raise Exception(error.get("message") or str(error))
+            raise Exception(str(error))
+        return data.get("result")
+
+    def get_daemon_version(session: requests.Session, rpc_id: int) -> Any:
+        try:
+            methods = rpc_call(session, rpc_id, "system.listMethods")
+            if isinstance(methods, list) and "daemon.get_version" in methods:
+                return rpc_call(session, rpc_id + 1, "daemon.get_version")
+        except Exception:
+            # Fall back to daemon.info to preserve existing behavior.
+            pass
+
+        return rpc_call(session, rpc_id + 1, "daemon.info")
+
+    try:
+        session = requests.Session()
+
+        if rpc_call(session, 1, "auth.login", password) is not True:
+            return {"success": False, "message": "Deluge Web UI authentication failed"}
+
+        if rpc_call(session, 2, "web.connected") is not True:
+            hosts = rpc_call(session, 3, "web.get_hosts") or []
+            if not hosts:
+                return {
+                    "success": False,
+                    "message": "Deluge Web UI isn't connected to Deluge core (no hosts configured). Add/connect a daemon in Deluge Web UI → Connection Manager.",
+                }
+
+            host_id = hosts[0][0]
+            for entry in hosts:
+                if isinstance(entry, list) and len(entry) >= 2 and entry[1] in {"127.0.0.1", "localhost"}:
+                    host_id = entry[0]
+                    break
+
+            rpc_call(session, 4, "web.connect", host_id)
+
+            if rpc_call(session, 5, "web.connected") is not True:
+                return {
+                    "success": False,
+                    "message": "Deluge Web UI couldn't connect to Deluge core. Check Deluge Web UI → Connection Manager.",
+                }
+
+        version = get_daemon_version(session, 6)
+        return {"success": True, "message": f"Connected to Deluge {version}"}
+
+    except requests.exceptions.ConnectionError:
+        return {"success": False, "message": "Could not connect to Deluge Web UI"}
+    except requests.exceptions.Timeout:
+        return {"success": False, "message": "Connection timed out"}
+    except Exception as e:
+        return {"success": False, "message": f"Connection failed: {str(e)}"}
+
+
+def _test_rtorrent_connection(current_values: Optional[Dict[str, Any]] = None) -> Dict[str, Any]:
+    """Test the rTorrent connection using current form values."""
+    from shelfmark.core.config import config
+    import ssl
+    from urllib.parse import urlparse
+
+    current_values = current_values or {}
+
+    raw_url = current_values.get("RTORRENT_URL") or config.get("RTORRENT_URL", "")
+    username = current_values.get("RTORRENT_USERNAME") or config.get("RTORRENT_USERNAME", "")
+    password = current_values.get("RTORRENT_PASSWORD") or config.get("RTORRENT_PASSWORD", "")
+
+    if not raw_url:
+        return {"success": False, "message": "rTorrent URL is required"}
+
+    url = normalize_http_url(raw_url)
+    if not url:
+        return {"success": False, "message": "rTorrent URL is invalid"}
+
+    try:
+        xmlrpc_client = get_hardened_xmlrpc_client()
+
+        # Add HTTP auth to URL if credentials provided
+        if username and password:
+            parsed = urlparse(url)
+            url = f"{parsed.scheme}://{username}:{password}@{parsed.netloc}{parsed.path}"
+
+        rpc_url = url.rstrip("/")
+        verify = get_ssl_verify(rpc_url)
+        if rpc_url.startswith("https://") and not verify:
+            ssl_context = ssl.create_default_context()
+            ssl_context.check_hostname = False
+            ssl_context.verify_mode = ssl.CERT_NONE
+            rpc = xmlrpc_client.ServerProxy(
+                rpc_url,
+                transport=xmlrpc_client.SafeTransport(context=ssl_context),
+            )
+        else:
+            rpc = xmlrpc_client.ServerProxy(rpc_url)
+
+        version = rpc.system.client_version()
+        return {"success": True, "message": f"Connected to rTorrent {version}"}
+    except Exception as e:
+        return {"success": False, "message": f"Connection failed: {str(e)}"}
+
+
+def _test_nzbget_connection(current_values: Optional[Dict[str, Any]] = None) -> Dict[str, Any]:
+    """Test the NZBGet connection using current form values."""
+    import requests
+    from shelfmark.core.config import config
+
+    current_values = current_values or {}
+
+    raw_url = current_values.get("NZBGET_URL") or config.get("NZBGET_URL", "")
+    username = current_values.get("NZBGET_USERNAME") or config.get("NZBGET_USERNAME", "nzbget")
+    password = current_values.get("NZBGET_PASSWORD") or config.get("NZBGET_PASSWORD", "")
+
+    if not raw_url:
+        return {"success": False, "message": "NZBGet URL is required"}
+
+    url = normalize_http_url(raw_url)
+    if not url:
+        return {"success": False, "message": "NZBGet URL is invalid"}
+
+    try:
+        rpc_url = f"{url.rstrip('/')}/jsonrpc"
+        payload = {"jsonrpc": "2.0", "method": "status", "params": [], "id": 1}
+        response = requests.post(rpc_url, json=payload, auth=(username, password), timeout=30, verify=get_ssl_verify(rpc_url))
+        response.raise_for_status()
+        result = response.json()
+        if "error" in result and result["error"]:
+            raise Exception(result["error"].get("message", "RPC error"))
+        version = result.get("result", {}).get("Version", "unknown")
+        return {"success": True, "message": f"Connected to NZBGet {version}"}
+    except requests.exceptions.ConnectionError:
+        return {"success": False, "message": "Could not connect to NZBGet"}
+    except requests.exceptions.Timeout:
+        return {"success": False, "message": "Connection timed out"}
+    except Exception as e:
+        return {"success": False, "message": f"Connection failed: {str(e)}"}
+
+
+def _test_sabnzbd_connection(current_values: Optional[Dict[str, Any]] = None) -> Dict[str, Any]:
+    """Test the SABnzbd connection using current form values."""
+    import requests
+    from shelfmark.core.config import config
+
+    current_values = current_values or {}
+
+    raw_url = current_values.get("SABNZBD_URL") or config.get("SABNZBD_URL", "")
+    api_key = current_values.get("SABNZBD_API_KEY") or config.get("SABNZBD_API_KEY", "")
+
+    if not raw_url:
+        return {"success": False, "message": "SABnzbd URL is required"}
+
+    url = normalize_http_url(raw_url)
+    if not url:
+        return {"success": False, "message": "SABnzbd URL is invalid"}
+    if not api_key:
+        return {"success": False, "message": "API key is required"}
+
+    try:
+        api_url = f"{url.rstrip('/')}/api"
+        params = {"apikey": api_key, "mode": "version", "output": "json"}
+        response = requests.get(api_url, params=params, timeout=30, verify=get_ssl_verify(api_url))
+        response.raise_for_status()
+        result = response.json()
+        version = result.get("version", "unknown")
+        return {"success": True, "message": f"Connected to SABnzbd {version}"}
+    except requests.exceptions.ConnectionError:
+        return {"success": False, "message": "Could not connect to SABnzbd"}
+    except requests.exceptions.Timeout:
+        return {"success": False, "message": "Connection timed out"}
+    except Exception as e:
+        return {"success": False, "message": f"Connection failed: {str(e)}"}
+
+
+# ==================== Download Clients Tab ====================
+
+@register_settings(
+    name="prowlarr_clients",
+    display_name="Download Clients",
+    icon="cog",
+    order=110,
+)
+def prowlarr_clients_settings():
+    """Download client settings shared by external release sources."""
+    return [
+        # --- Torrent Client Selection ---
+        HeadingField(
+            key="torrent_heading",
+            title="Torrent Client",
+            description="Select and configure a torrent client for downloading torrent releases.",
+        ),
+        SelectField(
+            key="PROWLARR_TORRENT_CLIENT",
+            label="Torrent Client",
+            description="Choose which torrent client to use",
+            options=[
+                {"value": "", "label": "None"},
+                {"value": "qbittorrent", "label": "qBittorrent"},
+                {"value": "transmission", "label": "Transmission"},
+                {"value": "deluge", "label": "Deluge"},
+                {"value": "rtorrent", "label": "rTorrent"},
+            ],
+            default="",
+        ),
+
+        # --- qBittorrent Settings ---
+        TextField(
+            key="QBITTORRENT_URL",
+            label="qBittorrent URL",
+            description="Web UI URL of your qBittorrent instance",
+            placeholder="http://qbittorrent:8080",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "qbittorrent"},
+        ),
+        TextField(
+            key="QBITTORRENT_USERNAME",
+            label="Username",
+            description="qBittorrent Web UI username",
+            placeholder="admin",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "qbittorrent"},
+        ),
+        PasswordField(
+            key="QBITTORRENT_PASSWORD",
+            label="Password",
+            description="qBittorrent Web UI password",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "qbittorrent"},
+        ),
+        ActionButton(
+            key="test_qbittorrent",
+            label="Test Connection",
+            description="Verify your qBittorrent configuration",
+            style="primary",
+            callback=_test_qbittorrent_connection,
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "qbittorrent"},
+        ),
+        TextField(
+            key="QBITTORRENT_CATEGORY",
+            label="Book Category",
+            description="Category to assign to book downloads in qBittorrent",
+            placeholder="books",
+            default="books",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "qbittorrent"},
+        ),
+        TextField(
+            key="QBITTORRENT_CATEGORY_AUDIOBOOK",
+            label="Audiobook Category",
+            description="Category for audiobook downloads. Leave empty to use the book category.",
+            placeholder="",
+            default="",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "qbittorrent"},
+        ),
+        TextField(
+            key="QBITTORRENT_DOWNLOAD_DIR",
+            label="Download Directory",
+            description="Server-side directory where torrents are downloaded (optional, uses qBittorrent default if not specified)",
+            placeholder="/downloads",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "qbittorrent"},
+        ),
+        TagListField(
+            key="QBITTORRENT_TAG",
+            label="Tags",
+            description="Tag(s) to assign to qBittorrent downloads. Leave empty for no tags.",
+            placeholder="",
+            default=[],
+            normalize_urls=False,
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "qbittorrent"},
+        ),
+
+        # --- Transmission Settings ---
+        TextField(
+            key="TRANSMISSION_URL",
+            label="Transmission URL",
+            description="URL of your Transmission instance (use https:// for TLS)",
+            placeholder="http://transmission:9091",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "transmission"},
+        ),
+        TextField(
+            key="TRANSMISSION_USERNAME",
+            label="Username",
+            description="Transmission RPC username (if authentication enabled)",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "transmission"},
+        ),
+        PasswordField(
+            key="TRANSMISSION_PASSWORD",
+            label="Password",
+            description="Transmission RPC password",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "transmission"},
+        ),
+        ActionButton(
+            key="test_transmission",
+            label="Test Connection",
+            description="Verify your Transmission configuration",
+            style="primary",
+            callback=_test_transmission_connection,
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "transmission"},
+        ),
+        TextField(
+            key="TRANSMISSION_CATEGORY",
+            label="Book Label",
+            description="Label to assign to book downloads in Transmission",
+            placeholder="books",
+            default="books",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "transmission"},
+        ),
+        TextField(
+            key="TRANSMISSION_CATEGORY_AUDIOBOOK",
+            label="Audiobook Label",
+            description="Label for audiobook downloads. Leave empty to use the book label.",
+            placeholder="",
+            default="",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "transmission"},
+        ),
+        TextField(
+            key="TRANSMISSION_DOWNLOAD_DIR",
+            label="Download Directory",
+            description="Server-side directory where torrents are downloaded (optional, uses Transmission default if not specified)",
+            placeholder="/downloads",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "transmission"},
+        ),
+
+        # --- Deluge Settings ---
+        TextField(
+            key="DELUGE_HOST",
+            label="Deluge Web UI Host/URL",
+            description="Hostname/IP or full URL of your Deluge Web UI (deluge-web)",
+            placeholder="http://deluge:8112",
+            default="localhost",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "deluge"},
+        ),
+        TextField(
+            key="DELUGE_PORT",
+            label="Deluge Web UI Port",
+            description="Deluge Web UI port (default: 8112)",
+            placeholder="8112",
+            default="8112",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "deluge"},
+        ),
+        PasswordField(
+            key="DELUGE_PASSWORD",
+            label="Password",
+            description="Deluge Web UI password (default: deluge)",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "deluge"},
+        ),
+        ActionButton(
+            key="test_deluge",
+            label="Test Connection",
+            description="Verify your Deluge configuration",
+            style="primary",
+            callback=_test_deluge_connection,
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "deluge"},
+        ),
+        TextField(
+            key="DELUGE_CATEGORY",
+            label="Book Label",
+            description="Label to assign to book downloads in Deluge",
+            placeholder="books",
+            default="books",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "deluge"},
+        ),
+        TextField(
+            key="DELUGE_CATEGORY_AUDIOBOOK",
+            label="Audiobook Label",
+            description="Label for audiobook downloads. Leave empty to use the book label.",
+            placeholder="",
+            default="",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "deluge"},
+        ),
+        TextField(
+            key="DELUGE_DOWNLOAD_DIR",
+            label="Download Directory",
+            description="Server-side directory where torrents are downloaded (optional, uses Deluge default if not specified)",
+            placeholder="/downloads",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "deluge"},
+        ),
+
+        # --- rTorrent Settings ---
+        TextField(
+            key="RTORRENT_URL",
+            label="rTorrent URL",
+            description="XML-RPC URL of your rTorrent instance",
+            placeholder="http://rtorrent:6881/RPC2",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "rtorrent"},
+        ),
+        TextField(
+            key="RTORRENT_USERNAME",
+            label="Username",
+            description="HTTP Basic auth username (if authentication enabled)",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "rtorrent"},
+        ),
+        PasswordField(
+            key="RTORRENT_PASSWORD",
+            label="Password",
+            description="HTTP Basic auth password",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "rtorrent"},
+        ),
+        ActionButton(
+            key="test_rtorrent",
+            label="Test Connection",
+            description="Verify your rTorrent configuration",
+            style="primary",
+            callback=_test_rtorrent_connection,
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "rtorrent"},
+        ),
+        TextField(
+            key="RTORRENT_LABEL",
+            label="Book Label",
+            description="Label to assign to book downloads in rTorrent",
+            placeholder="cwabd",
+            default="cwabd",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "rtorrent"},
+        ),
+        TextField(
+            key="RTORRENT_DOWNLOAD_DIR",
+            label="Download Directory",
+            description="Server-side directory where torrents are downloaded (optional, uses rTorrent default if not specified)",
+            placeholder="/downloads",
+            show_when={"field": "PROWLARR_TORRENT_CLIENT", "value": "rtorrent"},
+        ),
+        # Note: Torrent client download path must be mounted identically in both containers.
+        # Torrents are always copied (not moved) to preserve seeding capability.
+
+        # --- Usenet Client Selection ---
+        HeadingField(
+            key="usenet_heading",
+            title="Usenet Client",
+            description="Select and configure a usenet client for downloading NZB releases.",
+        ),
+        SelectField(
+            key="PROWLARR_USENET_CLIENT",
+            label="Usenet Client",
+            description="Choose which usenet client to use",
+            options=[
+                {"value": "", "label": "None"},
+                {"value": "nzbget", "label": "NZBGet"},
+                {"value": "sabnzbd", "label": "SABnzbd"},
+            ],
+            default="",
+        ),
+
+        # --- NZBGet Settings ---
+        TextField(
+            key="NZBGET_URL",
+            label="NZBGet URL",
+            description="URL of your NZBGet instance",
+            placeholder="http://nzbget:6789",
+            show_when={"field": "PROWLARR_USENET_CLIENT", "value": "nzbget"},
+        ),
+        TextField(
+            key="NZBGET_USERNAME",
+            label="Username",
+            description="NZBGet control username",
+            placeholder="nzbget",
+            default="nzbget",
+            show_when={"field": "PROWLARR_USENET_CLIENT", "value": "nzbget"},
+        ),
+        PasswordField(
+            key="NZBGET_PASSWORD",
+            label="Password",
+            description="NZBGet control password",
+            show_when={"field": "PROWLARR_USENET_CLIENT", "value": "nzbget"},
+        ),
+        ActionButton(
+            key="test_nzbget",
+            label="Test Connection",
+            description="Verify your NZBGet configuration",
+            style="primary",
+            callback=_test_nzbget_connection,
+            show_when={"field": "PROWLARR_USENET_CLIENT", "value": "nzbget"},
+        ),
+        TextField(
+            key="NZBGET_CATEGORY",
+            label="Book Category",
+            description="Category to assign to book downloads in NZBGet",
+            placeholder="Books",
+            default="Books",
+            show_when={"field": "PROWLARR_USENET_CLIENT", "value": "nzbget"},
+        ),
+        TextField(
+            key="NZBGET_CATEGORY_AUDIOBOOK",
+            label="Audiobook Category",
+            description="Category for audiobook downloads. Leave empty to use the book category.",
+            placeholder="",
+            default="",
+            show_when={"field": "PROWLARR_USENET_CLIENT", "value": "nzbget"},
+        ),
+
+        # --- SABnzbd Settings ---
+        TextField(
+            key="SABNZBD_URL",
+            label="SABnzbd URL",
+            description="URL of your SABnzbd instance",
+            placeholder="http://sabnzbd:8080",
+            show_when={"field": "PROWLARR_USENET_CLIENT", "value": "sabnzbd"},
+        ),
+        PasswordField(
+            key="SABNZBD_API_KEY",
+            label="API Key",
+            description="Found in SABnzbd: Config > General > API Key",
+            show_when={"field": "PROWLARR_USENET_CLIENT", "value": "sabnzbd"},
+        ),
+        ActionButton(
+            key="test_sabnzbd",
+            label="Test Connection",
+            description="Verify your SABnzbd configuration",
+            style="primary",
+            callback=_test_sabnzbd_connection,
+            show_when={"field": "PROWLARR_USENET_CLIENT", "value": "sabnzbd"},
+        ),
+        TextField(
+            key="SABNZBD_CATEGORY",
+            label="Book Category",
+            description="Category to assign to book downloads in SABnzbd",
+            placeholder="books",
+            default="books",
+            show_when={"field": "PROWLARR_USENET_CLIENT", "value": "sabnzbd"},
+        ),
+        TextField(
+            key="SABNZBD_CATEGORY_AUDIOBOOK",
+            label="Audiobook Category",
+            description="Category for audiobook downloads. Leave empty to use the book category.",
+            placeholder="",
+            default="",
+            show_when={"field": "PROWLARR_USENET_CLIENT", "value": "sabnzbd"},
+        ),
+        # Note: Usenet client download path must be mounted identically in both containers.
+        SelectField(
+            key="PROWLARR_USENET_ACTION",
+            label="NZB Completion Action",
+            description="Move deletes the job from your usenet client after import; Copy keeps it in the client",
+            options=[
+                {"value": "move", "label": "Move"},
+                {"value": "copy", "label": "Copy"},
+            ],
+            default="move",
+            show_when={"field": "PROWLARR_USENET_CLIENT", "notEmpty": True},
+        ),
+    ]

shelfmark/download/clients/torrent_utils.py

@@ -11,6 +11,7 @@ import requests
 
 from shelfmark.core.config import config
 from shelfmark.core.logger import setup_logger
+from shelfmark.download.network import get_ssl_verify
 
 logger = setup_logger(__name__)
 
@@ -72,6 +73,7 @@ def extract_torrent_info(
         return TorrentInfo(info_hash=expected_hash, torrent_data=None, is_magnet=False)
 
     headers: dict[str, str] = {"Accept": "application/x-bittorrent"}
+    # TODO: Move this source-specific Prowlarr auth handling into a source hook.
     api_key = str(config.get("PROWLARR_API_KEY", "") or "").strip()
     if api_key:
         headers["X-Api-Key"] = api_key
@@ -87,7 +89,7 @@ def extract_torrent_info(
 
         # Use allow_redirects=False to handle magnet link redirects manually
         # Some indexers redirect download URLs to magnet links
-        resp = requests.get(url, timeout=30, allow_redirects=False, headers=headers)
+        resp = requests.get(url, timeout=30, allow_redirects=False, headers=headers, verify=get_ssl_verify(url))
 
         # Check if this is a redirect to a magnet link
         if resp.status_code in (301, 302, 303, 307, 308):
@@ -102,7 +104,7 @@ def extract_torrent_info(
                 )
             # Not a magnet redirect, follow it manually
             logger.debug(f"Following redirect to: {redirect_url[:80]}...")
-            resp = requests.get(redirect_url, timeout=30, headers=headers)
+            resp = requests.get(redirect_url, timeout=30, headers=headers, verify=get_ssl_verify(redirect_url))
 
         resp.raise_for_status()
         torrent_data = resp.content
@@ -134,9 +136,12 @@ def extract_torrent_info(
         return TorrentInfo(info_hash=expected_hash, torrent_data=None, is_magnet=False)
 
 
-def parse_transmission_url(url: str) -> Tuple[str, int, str]:
-    """Parse Transmission URL into (host, port, path)."""
+def parse_transmission_url(url: str) -> Tuple[str, str, int, str]:
+    """Parse Transmission URL into (protocol, host, port, path)."""
     parsed = urlparse(url)
+    protocol = (parsed.scheme or "http").lower()
+    if protocol not in ("http", "https"):
+        protocol = "http"
     host = parsed.hostname or "localhost"
     port = parsed.port or 9091
     path = parsed.path or "/transmission/rpc"
@@ -145,7 +150,7 @@ def parse_transmission_url(url: str) -> Tuple[str, int, str]:
     if not path.endswith("/rpc"):
         path = path.rstrip("/") + "/transmission/rpc"
 
-    return host, port, path
+    return protocol, host, port, path
 
 
 def bencode_decode(data: bytes) -> tuple:

shelfmark/download/clients/transmission.py

@@ -4,18 +4,20 @@ Transmission download client for Prowlarr integration.
 Uses the transmission-rpc library to communicate with Transmission's RPC API.
 """
 
-from typing import Optional, Tuple
+from contextlib import contextmanager
+from typing import Any, Iterator, Optional, Tuple
 
 
 from shelfmark.core.config import config
 from shelfmark.core.logger import setup_logger
 from shelfmark.core.utils import normalize_http_url
-from shelfmark.release_sources.prowlarr.clients import (
+from shelfmark.download.network import get_ssl_verify
+from shelfmark.download.clients import (
     DownloadClient,
     DownloadStatus,
     register_client,
 )
-from shelfmark.release_sources.prowlarr.clients.torrent_utils import (
+from shelfmark.download.clients.torrent_utils import (
     extract_torrent_info,
     parse_transmission_url,
 )
@@ -23,6 +25,50 @@ from shelfmark.release_sources.prowlarr.clients.torrent_utils import (
 logger = setup_logger(__name__)
 
 
+@contextmanager
+def _transmission_session_verify_override(url: str) -> Iterator[None]:
+    """Temporarily override transmission-rpc's session factory when verify is disabled.
+
+    transmission-rpc performs an RPC call inside Client.__init__, so verify must be
+    set before the client is constructed.
+    """
+    verify = get_ssl_verify(url)
+    if verify:
+        yield
+        return
+
+    try:
+        import transmission_rpc.client as transmission_rpc_client
+    except Exception:
+        # If internals differ, gracefully fall back to default behavior.
+        yield
+        return
+
+    original_session_factory = transmission_rpc_client.requests.Session
+
+    def _session_factory(*args: Any, **kwargs: Any) -> Any:
+        session = original_session_factory(*args, **kwargs)
+        session.verify = False
+        return session
+
+    transmission_rpc_client.requests.Session = _session_factory
+    try:
+        yield
+    finally:
+        transmission_rpc_client.requests.Session = original_session_factory
+
+
+def _apply_transmission_ssl_verify(client: Any, url: str) -> None:
+    """Apply global certificate validation policy to transmission-rpc client."""
+    session = getattr(client, "_http_session", None)
+    if session is None:
+        return
+    try:
+        session.verify = get_ssl_verify(url)
+    except Exception as e:
+        logger.debug("Unable to apply Transmission TLS verify setting: %s", e)
+
+
 @register_client("torrent")
 class TransmissionClient(DownloadClient):
     """Transmission download client using transmission-rpc library."""
@@ -46,16 +92,35 @@ class TransmissionClient(DownloadClient):
         password = config.get("TRANSMISSION_PASSWORD", "")
 
         # Parse URL to extract host, port, and path
-        host, port, path = parse_transmission_url(url)
+        protocol, host, port, path = parse_transmission_url(url)
 
-        self._client = Client(
-            host=host,
-            port=port,
-            path=path,
-            username=username if username else None,
-            password=password if password else None,
-        )
+        client_kwargs = {
+            "host": host,
+            "port": port,
+            "path": path,
+            "username": username if username else None,
+            "password": password if password else None,
+            "protocol": protocol,
+        }
+        try:
+            with _transmission_session_verify_override(url):
+                self._client = Client(**client_kwargs)
+        except TypeError as e:
+            # Older transmission-rpc versions may not accept protocol as a kwarg.
+            if "protocol" not in str(e):
+                raise
+            client_kwargs.pop("protocol", None)
+            with _transmission_session_verify_override(url):
+                self._client = Client(**client_kwargs)
+            # Some versions expose protocol as an attribute rather than kwarg.
+            if protocol == "https" and hasattr(self._client, "protocol"):
+                try:
+                    setattr(self._client, "protocol", protocol)
+                except Exception:
+                    pass
+        _apply_transmission_ssl_verify(self._client, url)
         self._category = config.get("TRANSMISSION_CATEGORY", "books")
+        self._download_dir = config.get("TRANSMISSION_DOWNLOAD_DIR", "")
 
     @staticmethod
     def is_configured() -> bool:
@@ -100,18 +165,24 @@ class TransmissionClient(DownloadClient):
             resolved_category = category or self._category or ""
 
             torrent_info = extract_torrent_info(url, expected_hash=expected_hash)
+            add_kwargs = {}
+
+            if resolved_category:
+                add_kwargs["labels"] = [resolved_category]
+            if self._download_dir:
+                add_kwargs["download_dir"] = self._download_dir
 
             if torrent_info.torrent_data:
                 torrent = self._client.add_torrent(
                     torrent=torrent_info.torrent_data,
-                    labels=[resolved_category] if resolved_category else None,
+                    **add_kwargs,
                 )
             else:
                 # Use magnet URL if available, otherwise original URL
                 add_url = torrent_info.magnet_url or url
                 torrent = self._client.add_torrent(
                     torrent=add_url,
-                    labels=[resolved_category] if resolved_category else None,
+                    **add_kwargs,
                 )
 
             torrent_hash = torrent.hashString.lower()

shelfmark/download/fs.py

@@ -8,14 +8,83 @@ import errno
 import os
 import shutil
 import subprocess
+import tempfile
 import time
 from pathlib import Path
+from typing import Any, Callable, Optional, TypeVar, cast
 
 from shelfmark.core.logger import setup_logger
 from shelfmark.download.permissions_debug import log_transfer_permission_context
 
 logger = setup_logger(__name__)
 
+try:
+    from gevent import monkey as _gevent_monkey
+    from gevent.threadpool import ThreadPool as _GeventThreadPool
+except Exception:
+    _gevent_monkey = None
+    _GeventThreadPool = None
+
+T = TypeVar("T")
+_IO_THREADPOOL: Optional["_GeventThreadPool"] = None
+
+
+def _use_gevent_threadpool() -> bool:
+    return bool(
+        _gevent_monkey
+        and _GeventThreadPool
+        and _gevent_monkey.is_module_patched("threading")
+    )
+
+
+def _get_io_threadpool() -> "_GeventThreadPool":
+    global _IO_THREADPOOL
+    if _IO_THREADPOOL is None:
+        pool_size = max(2, min(8, os.cpu_count() or 2))
+        _IO_THREADPOOL = _GeventThreadPool(pool_size)
+    return _IO_THREADPOOL
+
+
+def _call_and_capture(func: Callable[..., T], args: tuple[Any, ...], kwargs: dict[str, Any]) -> tuple[bool, T | Exception]:
+    try:
+        return True, func(*args, **kwargs)
+    except Exception as exc:
+        return False, exc
+
+
+def _must_avoid_gevent_threadpool(func: Callable[..., Any]) -> bool:
+    """Return True when `func` is unsafe to execute inside gevent's threadpool."""
+    if not _use_gevent_threadpool() or not _gevent_monkey:
+        return False
+
+    # gevent.subprocess requires child watchers on the default event loop.
+    # Executing patched subprocess functions in a worker thread can raise:
+    # "TypeError: child watchers are only available on the default loop".
+    if _gevent_monkey.is_object_patched("subprocess", "run") and func is subprocess.run:
+        return True
+
+    return False
+
+
+def run_blocking_io(func: Callable[..., T], *args: Any, **kwargs: Any) -> T:
+    """Run blocking I/O in a native thread when under gevent.
+
+    gevent's threadpool will eagerly log exceptions raised inside worker threads,
+    even when the caller expects and handles those errors (e.g. FileExistsError for
+    collision retries, EXDEV for cross-device moves). Capture and re-raise in the
+    caller to avoid noisy, misleading tracebacks.
+    """
+    if _must_avoid_gevent_threadpool(func):
+        return func(*args, **kwargs)
+
+    if _use_gevent_threadpool():
+        ok, result = _get_io_threadpool().apply(_call_and_capture, (func, args, kwargs))
+        if ok:
+            return cast(T, result)
+        exc = cast(Exception, result)
+        raise exc
+    return func(*args, **kwargs)
+
 
 
 _VERIFY_IO_WAIT_SECONDS = 3.0
@@ -31,7 +100,8 @@ def _verify_transfer_size(
     Some filesystems (especially remote NAS/CIFS/NFS) can report stale sizes briefly
     after large writes. Do a second stat after a short delay before declaring failure.
     """
-    actual_size = dest.stat().st_size
+    # On network filesystems, `stat()` can block long enough to starve the gevent hub.
+    actual_size = run_blocking_io(dest.stat).st_size
     if actual_size == expected_size:
         return
 
@@ -41,7 +111,7 @@ def _verify_transfer_size(
     )
     time.sleep(_VERIFY_IO_WAIT_SECONDS)
 
-    actual_size = dest.stat().st_size
+    actual_size = run_blocking_io(dest.stat).st_size
     if actual_size != expected_size:
         raise IOError(
             f"File {action} incomplete, data loss may have occurred. "
@@ -74,11 +144,16 @@ def atomic_write(dest_path: Path, data: bytes, max_attempts: int = 100) -> Path:
         try_path = dest_path if attempt == 0 else parent / f"{base}_{attempt}{ext}"
         try:
             # O_CREAT | O_EXCL fails atomically if file exists
-            fd = os.open(str(try_path), os.O_CREAT | os.O_EXCL | os.O_WRONLY, 0o666)
+            fd = run_blocking_io(
+                os.open,
+                str(try_path),
+                os.O_CREAT | os.O_EXCL | os.O_WRONLY,
+                0o666,
+            )
             try:
-                os.write(fd, data)
+                run_blocking_io(os.write, fd, data)
             finally:
-                os.close(fd)
+                run_blocking_io(os.close, fd)
             if attempt > 0:
                 logger.info(f"File collision resolved: {try_path.name}")
             return try_path
@@ -96,30 +171,31 @@ def _is_permission_error(e: Exception) -> bool:
 def _system_op(op: str, source: Path, dest: Path) -> None:
     """Execute system command (mv or cp) as final fallback."""
     logger.warning("Attempting system %s as final fallback: %s -> %s", op, source, dest)
-    subprocess.run(
+    run_blocking_io(
+        subprocess.run,
         [op, "-f", str(source), str(dest)],
         check=True,
         capture_output=True,
-        text=True
+        text=True,
     )
 
 
 def _perform_nfs_fallback(source: Path, dest: Path, is_move: bool) -> None:
     """Handle NFS/SMB permission errors by falling back to copyfile -> system op."""
-    expected_size = source.stat().st_size
+    expected_size = run_blocking_io(source.stat).st_size
 
     try:
         # Fallback 1: copy content only
-        shutil.copyfile(str(source), str(dest))
+        run_blocking_io(shutil.copyfile, str(source), str(dest))
         _verify_transfer_size(dest, expected_size, "copy")
 
         if is_move:
-            source.unlink()
+            run_blocking_io(source.unlink)
         return
 
     except Exception as copy_error:
         # Clean up failed copy attempt if it exists
-        dest.unlink(missing_ok=True)
+        run_blocking_io(dest.unlink, missing_ok=True)
 
         if _is_permission_error(copy_error):
             log_transfer_permission_context("nfs_fallback_copyfile", source=source, dest=dest, error=copy_error)
@@ -130,36 +206,124 @@ def _perform_nfs_fallback(source: Path, dest: Path, is_move: bool) -> None:
         try:
             _system_op(op, source, dest)
             # Best-effort verify after external command.
-            if dest.exists():
+            if run_blocking_io(dest.exists):
                 _verify_transfer_size(dest, expected_size, op)
             if is_move:
-                source.unlink(missing_ok=True)
+                run_blocking_io(source.unlink, missing_ok=True)
         except subprocess.CalledProcessError as sys_error:
             log_transfer_permission_context("nfs_fallback_system", source=source, dest=dest, error=sys_error)
             logger.error("System %s failed (%s -> %s): %s", op, source, dest, sys_error.stderr)
-            dest.unlink(missing_ok=True)
+            run_blocking_io(dest.unlink, missing_ok=True)
             raise
 
 
+def _is_enoent_error(error: Exception) -> bool:
+    return isinstance(error, FileNotFoundError) or (
+        isinstance(error, OSError) and error.errno == errno.ENOENT
+    )
+
+
+def _can_use_partial_copy_after_enoent(
+    temp_path: Optional[Path],
+    expected_size: int,
+    action: str,
+) -> bool:
+    """Recover when copy2 writes bytes but fails while copying source metadata."""
+    if not temp_path or not run_blocking_io(temp_path.exists):
+        return False
+
+    try:
+        _verify_transfer_size(temp_path, expected_size, action)
+        return True
+    except Exception:
+        return False
+
+
 def _claim_destination(path: Path) -> bool:
     """Atomically claim a destination path by creating a placeholder file.
 
     Returns True if the placeholder was created. Caller must replace or unlink it.
     """
     try:
-        fd = os.open(str(path), os.O_CREAT | os.O_EXCL | os.O_WRONLY, 0o666)
+        fd = run_blocking_io(
+            os.open,
+            str(path),
+            os.O_CREAT | os.O_EXCL | os.O_WRONLY,
+            0o666,
+        )
     except FileExistsError:
         return False
     else:
-        os.close(fd)
+        run_blocking_io(os.close, fd)
         return True
 
 
+def _hardlink_not_supported(error: OSError) -> bool:
+    err = error.errno
+    return err in {
+        errno.EXDEV,
+        errno.EMLINK,
+        errno.EIO,
+        errno.EPERM,
+        errno.EACCES,
+        getattr(errno, "ENOTSUP", errno.EPERM),
+        getattr(errno, "EOPNOTSUPP", errno.EPERM),
+        getattr(errno, "ENOSYS", errno.EPERM),
+        errno.EINVAL,
+    }
+
+
+def _create_temp_path(dest_path: Path) -> Path:
+    fd, temp_path = run_blocking_io(
+        tempfile.mkstemp,
+        prefix=f".{dest_path.name}.",
+        suffix=".tmp",
+        dir=str(dest_path.parent),
+    )
+    run_blocking_io(os.close, fd)
+    return Path(temp_path)
+
+
+def _publish_temp_file(temp_path: Path, dest_path: Path) -> bool:
+    """Publish a temp file to its final path without overwriting existing files.
+
+    Returns True on success, False if the destination already exists.
+    """
+    claimed = _claim_destination(dest_path)
+    if not claimed:
+        return False
+
+    try:
+        # Publish by renaming the fully-written temp file into place. This gives
+        # watchers an IN_MOVED_TO-style event on the final path instead of relying
+        # on hardlink support in the destination filesystem.
+        run_blocking_io(os.replace, str(temp_path), str(dest_path))
+
+        # Best-effort nudge for watchers that only react to close-write on the
+        # final filename rather than rename/move events.
+        try:
+            fd = run_blocking_io(os.open, str(dest_path), os.O_WRONLY)
+            run_blocking_io(os.close, fd)
+        except OSError:
+            pass
+        return True
+    except Exception as e:
+        if _is_permission_error(e):
+            log_transfer_permission_context(
+                "publish_replace",
+                source=temp_path,
+                dest=dest_path,
+                error=e,
+            )
+        run_blocking_io(dest_path.unlink, missing_ok=True)
+        raise
+
+
 def atomic_move(source_path: Path, dest_path: Path, max_attempts: int = 100) -> Path:
     """Move a file with collision detection.
 
     Uses os.rename() for same-filesystem moves (atomic, triggers inotify events),
-    falls back to exclusive create + shutil.move for cross-filesystem moves.
+    falls back to copy-then-publish for cross-filesystem moves.
 
     Note: We use os.rename() instead of hardlink+unlink because os.rename()
     triggers proper inotify IN_MOVED_TO events that file watchers (like Calibre's
@@ -185,7 +349,7 @@ def atomic_move(source_path: Path, dest_path: Path, max_attempts: int = 100) ->
 
         # Check for existing file (os.rename would overwrite on Unix)
         claimed = False
-        if try_path.exists():
+        if run_blocking_io(try_path.exists):
             # Some filesystems can report false positives for exists() with
             # special characters. Probe with O_EXCL to confirm.
             claimed = _claim_destination(try_path)
@@ -195,37 +359,35 @@ def atomic_move(source_path: Path, dest_path: Path, max_attempts: int = 100) ->
         try:
             # os.rename is atomic on same filesystem and triggers inotify events
             if claimed:
-                os.replace(str(source_path), str(try_path))
+                run_blocking_io(os.replace, str(source_path), str(try_path))
             else:
-                os.rename(str(source_path), str(try_path))
+                run_blocking_io(os.rename, str(source_path), str(try_path))
             if attempt > 0:
                 logger.info(f"File collision resolved: {try_path.name}")
             return try_path
         except FileExistsError:
             # Race condition: file created between exists() check and rename()
             if claimed:
-                try_path.unlink(missing_ok=True)
+                run_blocking_io(try_path.unlink, missing_ok=True)
             continue
         except OSError as e:
-            # Cross-filesystem - fall back to exclusive create + verified copy + delete.
+            # Cross-filesystem - copy to temp and publish atomically.
             if e.errno != errno.EXDEV:
                 if claimed:
-                    try_path.unlink(missing_ok=True)
+                    run_blocking_io(try_path.unlink, missing_ok=True)
                 raise
 
-            expected_size = source_path.stat().st_size
+            expected_size = run_blocking_io(source_path.stat).st_size
+            if claimed:
+                run_blocking_io(try_path.unlink, missing_ok=True)
+                claimed = False
 
+            temp_path: Optional[Path] = None
             try:
-                if not claimed:
-                    # Claim destination path atomically.
-                    fd = os.open(str(try_path), os.O_CREAT | os.O_EXCL | os.O_WRONLY, 0o666)
-                    os.close(fd)
-
-                # Copy to a temp file first, then replace to avoid partial files.
-                temp_path = try_path.parent / f".{try_path.name}.tmp"
                 try:
+                    temp_path = _create_temp_path(try_path)
                     try:
-                        shutil.copy2(str(source_path), str(temp_path))
+                        run_blocking_io(shutil.copy2, str(source_path), str(temp_path))
                     except (PermissionError, OSError) as copy_error:
                         if _is_permission_error(copy_error):
                             logger.debug(
@@ -235,24 +397,46 @@ def atomic_move(source_path: Path, dest_path: Path, max_attempts: int = 100) ->
                                 copy_error,
                             )
                             _perform_nfs_fallback(source_path, temp_path, is_move=False)
+                        elif _is_enoent_error(copy_error) and _can_use_partial_copy_after_enoent(
+                            temp_path,
+                            expected_size,
+                            "move",
+                        ):
+                            logger.warning(
+                                "Source vanished during move-copy metadata step; preserving copied data: %s -> %s",
+                                source_path,
+                                temp_path,
+                            )
                         else:
                             raise
 
-                    temp_path.replace(try_path)
-                    _verify_transfer_size(try_path, expected_size, "move")
-                    source_path.unlink()
+                    _verify_transfer_size(temp_path, expected_size, "move")
+                    published = _publish_temp_file(temp_path, try_path)
+                    if not published:
+                        run_blocking_io(temp_path.unlink, missing_ok=True)
+                        continue
+
+                    try:
+                        _verify_transfer_size(try_path, expected_size, "move")
+                    except Exception:
+                        run_blocking_io(try_path.unlink, missing_ok=True)
+                        raise
+
+                    run_blocking_io(source_path.unlink)
 
                     if attempt > 0:
                         logger.info(f"File collision resolved: {try_path.name}")
                     return try_path
 
+                except FileExistsError:
+                    if temp_path:
+                        run_blocking_io(temp_path.unlink, missing_ok=True)
+                    continue
                 except Exception:
-                    try_path.unlink(missing_ok=True)
-                    temp_path.unlink(missing_ok=True)
+                    if temp_path:
+                        run_blocking_io(temp_path.unlink, missing_ok=True)
                     raise
 
-            except FileExistsError:
-                continue
             except (PermissionError, OSError) as e:
                 if _is_permission_error(e):
                     log_transfer_permission_context(
@@ -306,21 +490,22 @@ def atomic_hardlink(source_path: Path, dest_path: Path, max_attempts: int = 100)
     for attempt in range(max_attempts):
         try_path = dest_path if attempt == 0 else parent / f"{base}_{attempt}{ext}"
         try:
-            os.link(str(source_path), str(try_path))
+            run_blocking_io(os.link, str(source_path), str(try_path))
             if attempt > 0:
                 logger.info(f"File collision resolved: {try_path.name}")
             return try_path
         except FileExistsError:
             continue
         except OSError as e:
-            if _is_permission_error(e) or e.errno in (errno.EXDEV, errno.EMLINK):
-                if _is_permission_error(e):
-                    log_transfer_permission_context(
-                        "atomic_hardlink",
-                        source=source_path,
-                        dest=try_path,
-                        error=e,
-                    )
+            permission_error = _is_permission_error(e)
+            if permission_error:
+                log_transfer_permission_context(
+                    "atomic_hardlink",
+                    source=source_path,
+                    dest=try_path,
+                    error=e,
+                )
+            if permission_error or _hardlink_not_supported(e):
                 logger.debug(
                     "Hardlink failed (%s), falling back to copy: %s -> %s",
                     e,
@@ -336,8 +521,8 @@ def atomic_hardlink(source_path: Path, dest_path: Path, max_attempts: int = 100)
 def atomic_copy(source_path: Path, dest_path: Path, max_attempts: int = 100) -> Path:
     """Copy a file with atomic collision detection.
 
-    Uses exclusive create to claim destination, then copies via temp file
-    to avoid partial files on failure.
+    Uses a temp file in the destination directory and publishes it via rename,
+    avoiding partial files on failure.
 
     Args:
         source_path: Source file to copy
@@ -353,57 +538,73 @@ def atomic_copy(source_path: Path, dest_path: Path, max_attempts: int = 100) ->
     base = dest_path.stem
     ext = dest_path.suffix
     parent = dest_path.parent
+    expected_size = run_blocking_io(source_path.stat).st_size
 
     for attempt in range(max_attempts):
         try_path = dest_path if attempt == 0 else parent / f"{base}_{attempt}{ext}"
+        if run_blocking_io(try_path.exists):
+            continue
+        temp_path: Optional[Path] = None
         try:
-            # Atomically claim the destination by creating an exclusive file
-            fd = os.open(str(try_path), os.O_CREAT | os.O_EXCL | os.O_WRONLY, 0o666)
-            os.close(fd)
-            
-            # Copy to temp file first, then replace to avoid partial files
-            temp_path = try_path.parent / f".{try_path.name}.tmp"
+            temp_path = _create_temp_path(try_path)
             try:
-                try:
-                    shutil.copy2(str(source_path), str(temp_path))
-                except (PermissionError, OSError) as e:
-                    # Handle NFS permission errors immediately here
-                    if _is_permission_error(e):
-                        log_transfer_permission_context(
-                            "atomic_copy",
-                            source=source_path,
-                            dest=temp_path,
-                            error=e,
-                        )
-                        logger.debug(
-                            "Permission error during copy, falling back to copyfile (%s -> %s): %s",
+                run_blocking_io(shutil.copy2, str(source_path), str(temp_path))
+            except (PermissionError, OSError) as e:
+                # Handle NFS permission errors immediately here
+                if _is_permission_error(e):
+                    log_transfer_permission_context(
+                        "atomic_copy",
+                        source=source_path,
+                        dest=temp_path,
+                        error=e,
+                    )
+                    logger.debug(
+                        "Permission error during copy, falling back to copyfile (%s -> %s): %s",
+                        source_path,
+                        temp_path,
+                        e,
+                    )
+                    try:
+                        _perform_nfs_fallback(source_path, temp_path, is_move=False)
+                    except Exception as fallback_error:
+                        logger.error(
+                            "NFS fallback also failed (%s -> %s): %s",
                             source_path,
                             temp_path,
-                            e,
+                            fallback_error,
                         )
-                        try:
-                            _perform_nfs_fallback(source_path, temp_path, is_move=False)
-                        except Exception as fallback_error:
-                            logger.error(
-                                "NFS fallback also failed (%s -> %s): %s",
-                                source_path,
-                                temp_path,
-                                fallback_error,
-                            )
-                            raise e from fallback_error
-                    else:
-                        raise
-                
-                temp_path.replace(try_path)
-                _verify_transfer_size(try_path, source_path.stat().st_size, "copy")
-                if attempt > 0:
-                    logger.info(f"File collision resolved: {try_path.name}")
-                return try_path
+                        raise e from fallback_error
+                elif _is_enoent_error(e) and _can_use_partial_copy_after_enoent(
+                    temp_path,
+                    expected_size,
+                    "copy",
+                ):
+                    logger.warning(
+                        "Source vanished during copy2 metadata step; preserving copied data: %s -> %s",
+                        source_path,
+                        temp_path,
+                    )
+                else:
+                    raise
+
+            _verify_transfer_size(temp_path, expected_size, "copy")
+            published = _publish_temp_file(temp_path, try_path)
+            if not published:
+                run_blocking_io(temp_path.unlink, missing_ok=True)
+                continue
+
+            try:
+                _verify_transfer_size(try_path, expected_size, "copy")
             except Exception:
-                try_path.unlink(missing_ok=True)
-                temp_path.unlink(missing_ok=True)
+                run_blocking_io(try_path.unlink, missing_ok=True)
                 raise
-        except FileExistsError:
-            continue
+
+            if attempt > 0:
+                logger.info(f"File collision resolved: {try_path.name}")
+            return try_path
+        except Exception:
+            if temp_path:
+                run_blocking_io(temp_path.unlink, missing_ok=True)
+            raise
 
     raise RuntimeError(f"Could not copy file after {max_attempts} attempts: {dest_path}")

shelfmark/download/http.py

@@ -5,13 +5,13 @@ import time
 from io import BytesIO
 from threading import Event, Thread
 from typing import Callable, Optional
-from urllib.parse import urlparse
+from urllib.parse import urlparse, urljoin
 
 import requests
 from tqdm import tqdm
 
 from shelfmark.download import network
-from shelfmark.download.network import get_proxies
+from shelfmark.download.network import get_proxies, get_ssl_verify
 from shelfmark.core.config import config as app_config
 from shelfmark.core.logger import setup_logger
 
@@ -177,13 +177,24 @@ def html_get_page(
     cancel_flag: Optional[Event] = None,
     status_callback: Optional[Callable[[str, Optional[str]], None]] = None,
     allow_bypasser_fallback: bool = True,
-) -> str:
+    include_response_url: bool = False,
+    success_delay: float = 1.0,
+    session: Optional[requests.Session] = None,
+) -> str | tuple[str, str]:
     """Fetch HTML content from a URL with retry mechanism.
 
     Args:
         allow_bypasser_fallback: If False, 403 errors will trigger mirror rotation
             instead of switching to the bypasser. Use for search operations.
+        include_response_url: If True, return `(html, final_url)` to expose the
+            resolved response URL after redirects.
+        success_delay: Optional delay (seconds) after successful fetch.
     """
+    def _result(html: str, response_url: str) -> str | tuple[str, str]:
+        if include_response_url:
+            return html, response_url
+        return html
+
     retry = retry if retry is not None else app_config.MAX_RETRY
     selector = selector or network.AAMirrorSelector()
     original_url = url
@@ -194,7 +205,7 @@ def html_get_page(
         # Check for cancellation before each attempt
         if cancel_flag and cancel_flag.is_set():
             logger.info(f"html_get_page cancelled before attempt {attempt}")
-            return ""
+            return _result("", current_url)
 
         try:
             if use_bypasser_now and _is_cf_bypass_enabled():
@@ -218,23 +229,91 @@ def html_get_page(
                     heartbeat_thread.start()
                 try:
                     result = get_bypassed_page(current_url, selector, cancel_flag)
-                    return result or ""
+                    return _result(result or "", current_url)
                 except Exception as e:
                     logger.warning(f"Bypasser error: {type(e).__name__}: {e}")
-                    return ""
+                    return _result("", current_url)
                 finally:
                     heartbeat_stop.set()
                     if heartbeat_thread:
                         heartbeat_thread.join(timeout=1)
 
             logger.debug(f"GET: {current_url}")
-            # Try with CF cookies/UA if available (from previous bypass)
-            headers = {}
-            cookies = _apply_cf_bypass(current_url, headers)
-            response = requests.get(current_url, proxies=get_proxies(current_url), timeout=REQUEST_TIMEOUT, cookies=cookies, headers=headers)
-            response.raise_for_status()
-            time.sleep(1)
-            return response.text
+
+            # Use a browser-like UA by default (AA can behave differently for python-requests UA).
+            headers = {"User-Agent": DOWNLOAD_HEADERS["User-Agent"]}
+
+            # AA mirrors sometimes redirect to other (seized/dead) mirror domains. If we let
+            # requests follow those redirects, the request fails on DNS and we rotate away
+            # from an otherwise working mirror. Handle AA redirects manually instead.
+            is_aa_url = network.should_rotate_dns_for_url(current_url)
+            allow_redirects = not is_aa_url
+
+            redirects_followed = 0
+            while True:
+                # Try with CF cookies/UA if available (from previous bypass)
+                cookies = _apply_cf_bypass(current_url, headers)
+                request_client = session or requests
+                response = request_client.get(
+                    current_url,
+                    proxies=get_proxies(current_url),
+                    timeout=REQUEST_TIMEOUT,
+                    cookies=cookies,
+                    headers=headers,
+                    allow_redirects=allow_redirects,
+                    verify=get_ssl_verify(current_url),
+                )
+
+                if is_aa_url and response.is_redirect:
+                    location = response.headers.get("Location", "")
+                    if not location:
+                        raise requests.exceptions.TooManyRedirects(f"Redirect with no Location header: {current_url}")
+
+                    redirect_url = urljoin(current_url, location)
+                    current_host = urlparse(current_url).hostname or ""
+                    redirect_host = urlparse(redirect_url).hostname or ""
+
+                    # If an AA mirror redirects to a different hostname, treat that as a mirror
+                    # failure and rotate rather than following the redirect (auto mode only).
+                    if current_host and redirect_host and current_host != redirect_host:
+                        if not network.is_aa_auto_mode():
+                            logger.warning(
+                                "AA mirror locked to %s but redirected to %s: %s",
+                                current_host,
+                                redirect_host,
+                                current_url,
+                            )
+                            return _result("", current_url)
+
+                        new_url = _try_rotation(original_url, current_url, selector)
+                        if new_url:
+                            current_url = new_url
+                            # Reset per-request state for the new host.
+                            headers = {"User-Agent": DOWNLOAD_HEADERS["User-Agent"]}
+                            is_aa_url = network.should_rotate_dns_for_url(current_url)
+                            allow_redirects = not is_aa_url
+                            redirects_followed = 0
+                            continue
+
+                        logger.warning(
+                            "AA redirect from %s to %s but mirrors exhausted: %s",
+                            current_host,
+                            redirect_host,
+                            current_url,
+                        )
+                        return _result("", current_url)
+
+                    # Same-host redirect (relative or absolute) - follow manually.
+                    redirects_followed += 1
+                    if redirects_followed > 5:
+                        raise requests.exceptions.TooManyRedirects(f"Too many redirects for {current_url}")
+                    current_url = redirect_url
+                    continue
+
+                response.raise_for_status()
+                if success_delay > 0:
+                    time.sleep(success_delay)
+                return _result(response.text, response.url)
 
         except Exception as e:
             status = _get_status_code(e)
@@ -248,7 +327,7 @@ def html_get_page(
                         current_url = new_url
                         continue
                     logger.warning(f"403 error, mirrors exhausted: {current_url}")
-                    return ""
+                    return _result("", current_url)
 
                 if _is_cf_bypass_enabled() and not use_bypasser_now:
                     # Before switching to bypasser, check if cookies have become available
@@ -265,12 +344,12 @@ def html_get_page(
                     use_bypasser_now = True
                     continue
                 logger.warning(f"403 error, giving up: {current_url}")
-                return ""
+                return _result("", current_url)
 
             # 404 = Not found
             if status == 404:
                 logger.warning(f"404 error: {current_url}")
-                return ""
+                return _result("", current_url)
 
             # Try mirror/DNS rotation on retryable errors
             if _is_retryable_error(e):
@@ -286,7 +365,7 @@ def html_get_page(
             else:
                 logger.error(f"Giving up after {retry} attempts: {current_url}")
 
-    return ""
+    return _result("", current_url)
 
 
 def download_url(
@@ -325,7 +404,7 @@ def download_url(
             logger.info(f"Downloading: {current_url} (attempt {attempt + 1}/{MAX_DOWNLOAD_RETRIES})")
             # Try with CF cookies/UA if available
             cookies = _apply_cf_bypass(current_url, headers)
-            response = requests.get(current_url, stream=True, proxies=get_proxies(current_url), timeout=REQUEST_TIMEOUT, cookies=cookies, headers=headers)
+            response = requests.get(current_url, stream=True, proxies=get_proxies(current_url), timeout=REQUEST_TIMEOUT, cookies=cookies, headers=headers, verify=get_ssl_verify(current_url))
             response.raise_for_status()
 
             if status_callback:
@@ -436,7 +515,7 @@ def _try_resume(
             cookies = _apply_cf_bypass(url, resume_headers)
             response = requests.get(
                 url, stream=True, proxies=get_proxies(url), timeout=REQUEST_TIMEOUT,
-                headers=resume_headers, cookies=cookies
+                headers=resume_headers, cookies=cookies, verify=get_ssl_verify(url)
             )
             
             # Check resume support

shelfmark/download/network.py

@@ -90,6 +90,59 @@ def get_proxies(url: str = "") -> dict:
 
     return {}
 
+
+def get_ssl_verify(url: str = "") -> bool:
+    """Return the ``verify`` value for outbound requests based on the
+    CERTIFICATE_VALIDATION setting.
+
+    - ``enabled``        → always ``True``
+    - ``disabled_local`` → ``False`` for local/private addresses, ``True`` otherwise
+    - ``disabled``       → always ``False``
+    """
+    mode = app_config.get("CERTIFICATE_VALIDATION", "enabled")
+
+    if mode == "disabled":
+        return False
+
+    if mode == "disabled_local" and url:
+        try:
+            parsed = urllib.parse.urlparse(url)
+            hostname = parsed.hostname or ""
+            if hostname and _is_local_address(hostname):
+                return False
+        except Exception:
+            pass
+
+    return True
+
+
+_ssl_warnings_suppressed = False
+
+
+def _apply_ssl_warning_suppression() -> None:
+    """Suppress or restore urllib3 InsecureRequestWarning based on the
+    CERTIFICATE_VALIDATION setting.
+
+    Called once at init and again whenever the setting changes via the UI.
+    Only modifies warning filters when the mode is not 'enabled', so the
+    default case is a complete no-op (zero behavioural change for users who
+    never touch the setting).
+    """
+    global _ssl_warnings_suppressed  # noqa: PLW0603
+    import urllib3
+
+    mode = app_config.get("CERTIFICATE_VALIDATION", "enabled")
+    if mode in ("disabled", "disabled_local"):
+        urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
+        _ssl_warnings_suppressed = True
+        logger.debug("SSL warnings suppressed (certificate validation: %s)", mode)
+    elif _ssl_warnings_suppressed:
+        import warnings
+        warnings.simplefilter("default", urllib3.exceptions.InsecureRequestWarning)
+        _ssl_warnings_suppressed = False
+        logger.debug("SSL warnings restored (certificate validation: enabled)")
+
+
 # DNS state - authoritative values managed by this module
 # Other modules should use get_dns_config() to read these
 CUSTOM_DNS: List[str] = []
@@ -418,7 +471,8 @@ class DoHResolver:
                 self.base_url,
                 params=params,
                 proxies=get_proxies(self.base_url),
-                timeout=10  # Increased from 5s to handle slow network conditions
+                timeout=10,  # Increased from 5s to handle slow network conditions
+                verify=get_ssl_verify(self.base_url),
             )
             response.raise_for_status()
             
@@ -738,11 +792,22 @@ def rotate_dns_and_reset_aa() -> bool:
     if not configured_url:
         configured_url = "auto"
 
-    if configured_url == "auto" or _aa_base_url in _aa_urls:
+    if configured_url == "auto":
+        # Auto mode always resets to the first mirror to restart the cascade
         _current_aa_url_index = 0
-        _aa_base_url = _aa_urls[0] if _aa_urls else "https://annas-archive.se"
+        _aa_base_url = _aa_urls[0] if _aa_urls else "https://annas-archive.gl"
         logger.info(f"After DNS switch, resetting AA URL to: {_aa_base_url}")
         _save_state(aa_url=_aa_base_url)
+    else:
+        # Keep the user's configured primary mirror (if it exists in the list),
+        # otherwise keep the configured URL as-is (custom/env).
+        if configured_url in _aa_urls:
+            _current_aa_url_index = _aa_urls.index(configured_url)
+        else:
+            _current_aa_url_index = 0
+        _aa_base_url = configured_url
+        logger.info(f"After DNS switch, keeping configured AA URL: {_aa_base_url}")
+        _save_state(aa_url=_aa_base_url)
     return True
 
 def set_dns_provider(provider: str, manual_servers: list[str] | None = None, use_doh: bool | None = None) -> bool:
@@ -916,6 +981,11 @@ def _initialize_aa_state() -> None:
     if not configured_url:
         configured_url = "auto"
 
+    # If AA_BASE_URL is pinned to a custom URL that's not in the mirror list, we still
+    # want to treat it as the active base (and rewrite known mirror links to it).
+    if configured_url != "auto" and configured_url not in _aa_urls:
+        _aa_urls = [configured_url] + _aa_urls
+
     if configured_url == "auto":
         if state.get('aa_base_url') and state['aa_base_url'] in _aa_urls:
             _current_aa_url_index = _aa_urls.index(state['aa_base_url'])
@@ -924,7 +994,7 @@ def _initialize_aa_state() -> None:
             logger.debug(f"AA_BASE_URL: auto, checking available urls {_aa_urls}")
             for i, url in enumerate(_aa_urls):
                 try:
-                    response = requests.get(url, proxies=get_proxies(url), timeout=3)
+                    response = requests.get(url, proxies=get_proxies(url), timeout=3, verify=get_ssl_verify(url))
                     if response.status_code == 200:
                         _current_aa_url_index = i
                         _aa_base_url = url
@@ -1020,6 +1090,7 @@ def init(force: bool = False) -> None:
         try:
             init_dns(force=force)
             init_aa(force=force)
+            _apply_ssl_warning_suppression()
             # Only set flag AFTER work completes successfully
             _initialized = True
         except Exception:
@@ -1031,6 +1102,17 @@ def get_aa_base_url():
     _ensure_initialized()
     return _aa_base_url
 
+def is_aa_auto_mode() -> bool:
+    """Return True when AA_BASE_URL is set to 'auto' (mirror failover enabled)."""
+    configured_url = normalize_http_url(
+        app_config.get("AA_BASE_URL", "auto"),
+        default_scheme="https",
+        allow_special=("auto",),
+    )
+    if not configured_url:
+        configured_url = "auto"
+    return configured_url == "auto"
+
 def get_available_aa_urls():
     """Get list of configured AA URLs (copy)."""
     _ensure_initialized()
@@ -1082,12 +1164,17 @@ class AAMirrorSelector:
         Returns (new_base, action) where action is 'mirror', 'dns', or 'exhausted'.
         """
         self.attempts_this_dns += 1
-        if self.attempts_this_dns >= len(self.aa_urls):
+        max_attempts = len(self.aa_urls) if is_aa_auto_mode() else 1
+        if self.attempts_this_dns >= max_attempts:
             if allow_dns and rotate_dns_and_reset_aa():
                 self._ensure_fresh_state(reset_attempts=True)
                 return self.current_base, "dns"
             return None, "exhausted"
 
+        if not is_aa_auto_mode():
+            # Mirror is explicitly configured; do not fail over to other mirrors.
+            return None, "exhausted"
+
         next_index = (self._index + 1) % len(self.aa_urls)
         set_aa_url_index(next_index)
         self._ensure_fresh_state(reset_attempts=False)

shelfmark/download/orchestrator.py

@@ -9,19 +9,24 @@ import random
 import threading
 import time
 from concurrent.futures import Future, ThreadPoolExecutor
+from email.utils import parseaddr
 from pathlib import Path
 from threading import Event, Lock
 from typing import Any, Dict, List, Optional, Tuple
 
 from shelfmark.core.config import config
 from shelfmark.core.logger import setup_logger
-from shelfmark.core.models import BookInfo, DownloadTask, QueueStatus, SearchFilters, SearchMode
+from shelfmark.core.models import DownloadTask, QueueStatus, SearchMode
 from shelfmark.core.queue import book_queue
-from shelfmark.core.utils import transform_cover_url
+from shelfmark.core.utils import transform_cover_url, is_audiobook as check_audiobook
+from shelfmark.config import env as env_config
+from shelfmark.download.fs import run_blocking_io
 from shelfmark.download.postprocess.pipeline import is_torrent_source, safe_cleanup_path
 from shelfmark.download.postprocess.router import post_process_download
-from shelfmark.release_sources import direct_download, get_handler, get_source_display_name
-from shelfmark.release_sources.direct_download import SearchUnavailable
+from shelfmark.release_sources import (
+    get_handler,
+    get_source_display_name,
+)
 
 logger = setup_logger(__name__)
 
@@ -54,87 +59,91 @@ _last_activity: Dict[str, float] = {}
 _last_status_event: Dict[str, Tuple[str, Optional[str]]] = {}
 STALL_TIMEOUT = 300  # 5 minutes without progress/status update = stalled
 
-def search_books(query: str, filters: SearchFilters) -> List[Dict[str, Any]]:
-    """Search for books matching the query."""
-    try:
-        books = direct_download.search_books(query, filters)
-        return [_book_info_to_dict(book) for book in books]
-    except SearchUnavailable:
-        raise
-    except Exception as e:
-        logger.error_trace(f"Error searching books: {e}")
-        raise
-
-def get_book_info(book_id: str) -> Optional[Dict[str, Any]]:
-    """Get detailed information for a specific book."""
-    try:
-        book = direct_download.get_book_info(book_id)
-        return _book_info_to_dict(book)
-    except Exception as e:
-        logger.error_trace(f"Error getting book info: {e}")
-        raise
-
-def queue_book(book_id: str, priority: int = 0, source: str = "direct_download") -> Tuple[bool, Optional[str]]:
-    """Add a book to the download queue. Returns (success, error_message)."""
-    try:
-        book_info = direct_download.get_book_info(book_id, fetch_download_count=False)
-        if not book_info:
-            error_msg = f"Could not fetch book info for {book_id}"
-            logger.warning(error_msg)
-            return False, error_msg
-
-        # Create a source-agnostic download task
-        task = DownloadTask(
-            task_id=book_id,
-            source=source,
-            title=book_info.title,
-            author=book_info.author,
-            format=book_info.format,
-            size=book_info.size,
-            preview=book_info.preview,
-            content_type=book_info.content,
-            search_mode=SearchMode.DIRECT,
-            priority=priority,
-        )
-
-        if not book_queue.add(task):
-            logger.info(f"Book already in queue: {book_info.title}")
-            return False, "Book is already in the download queue"
-
-        logger.info(f"Book queued with priority {priority}: {book_info.title}")
-
-        # Broadcast status update via WebSocket
-        if ws_manager:
-            ws_manager.broadcast_status_update(queue_status())
-
-        return True, None
-    except SearchUnavailable as e:
-        error_msg = f"Search service unavailable: {e}"
-        logger.warning(error_msg)
-        return False, error_msg
-    except Exception as e:
-        error_msg = f"Error queueing book: {e}"
-        logger.error_trace(error_msg)
-        return False, error_msg
+def _is_plain_email_address(value: str) -> bool:
+    parsed = parseaddr(value or "")[1]
+    return bool(parsed) and "@" in parsed and parsed == value
 
 
-def queue_release(release_data: dict, priority: int = 0) -> Tuple[bool, Optional[str]]:
+def _resolve_email_destination(
+    user_id: Optional[int] = None,
+) -> Tuple[Optional[str], Optional[str]]:
+    """Resolve the destination email address for email output mode.
+
+    Returns:
+      (email_to, error_message)
+    """
+    configured_recipient = str(config.get("EMAIL_RECIPIENT", "", user_id=user_id) or "").strip()
+    if configured_recipient:
+        if _is_plain_email_address(configured_recipient):
+            return configured_recipient, None
+        return None, "Configured email recipient is invalid"
+
+    return None, None
+def _parse_release_search_mode(value: Any) -> SearchMode:
+    if isinstance(value, SearchMode):
+        return value
+    if value is None:
+        return SearchMode.UNIVERSAL
+    if isinstance(value, str):
+        try:
+            return SearchMode(value.strip().lower())
+        except ValueError as exc:
+            raise ValueError(f"Invalid search_mode: {value}") from exc
+    raise ValueError(f"Invalid search_mode: {value}")
+
+
+def queue_release(
+    release_data: dict,
+    priority: int = 0,
+    user_id: Optional[int] = None,
+    username: Optional[str] = None,
+) -> Tuple[bool, Optional[str]]:
     """Add a release to the download queue. Returns (success, error_message)."""
     try:
-        source = release_data.get('source', 'direct_download')
+        source = release_data['source']
         extra = release_data.get('extra', {})
+        raw_request_id = release_data.get('_request_id')
+        request_id: Optional[int] = None
+        if isinstance(raw_request_id, int) and raw_request_id > 0:
+            request_id = raw_request_id
+        search_mode = _parse_release_search_mode(release_data.get("search_mode"))
 
         # Get author, year, preview, and content_type from top-level (preferred) or extra (fallback)
         author = release_data.get('author') or extra.get('author')
         year = release_data.get('year') or extra.get('year')
         preview = release_data.get('preview') or extra.get('preview')
         content_type = release_data.get('content_type') or extra.get('content_type')
+        source_url_raw = (
+            release_data.get('download_url')
+            or release_data.get('source_url')
+            or release_data.get('info_url')
+            or extra.get('detail_url')
+            or extra.get('source_url')
+        )
+        source_url = source_url_raw.strip() if isinstance(source_url_raw, str) else None
+        if source_url == "":
+            source_url = None
 
         # Get series info for library naming templates
         series_name = release_data.get('series_name') or extra.get('series_name')
         series_position = release_data.get('series_position') or extra.get('series_position')
         subtitle = release_data.get('subtitle') or extra.get('subtitle')
 
+        books_output_mode = str(
+            config.get("BOOKS_OUTPUT_MODE", "folder", user_id=user_id) or "folder"
+        ).strip().lower()
+        is_audiobook = check_audiobook(content_type)
+
+        output_mode = "folder" if is_audiobook else books_output_mode
+        output_args: Dict[str, Any] = {}
+
+        if output_mode == "email" and not is_audiobook:
+            email_to, email_error = _resolve_email_destination(user_id=user_id)
+            if email_error:
+                return False, email_error
+            if email_to:
+                output_args = {"to": email_to}
+
         # Create a source-agnostic download task from release data
         task = DownloadTask(
             task_id=release_data['source_id'],
@@ -146,11 +155,17 @@ def queue_release(release_data: dict, priority: int = 0) -> Tuple[bool, Optional
             size=release_data.get('size'),
             preview=preview,
             content_type=content_type,
+            source_url=source_url,
             series_name=series_name,
             series_position=series_position,
             subtitle=subtitle,
-            search_mode=SearchMode.UNIVERSAL,
+            search_mode=search_mode,
+            output_mode=output_mode,
+            output_args=output_args,
             priority=priority,
+            user_id=user_id,
+            username=username,
+            request_id=request_id,
         )
 
         if not book_queue.add(task):
@@ -166,8 +181,7 @@ def queue_release(release_data: dict, priority: int = 0) -> Tuple[bool, Optional
         return True, None
 
     except ValueError as e:
-        # Handler not found for this source
-        error_msg = f"Unknown release source: {e}"
+        error_msg = str(e)
         logger.warning(error_msg)
         return False, error_msg
     except KeyError as e:
@@ -179,12 +193,12 @@ def queue_release(release_data: dict, priority: int = 0) -> Tuple[bool, Optional
         logger.error_trace(error_msg)
         return False, error_msg
 
-def queue_status() -> Dict[str, Dict[str, Any]]:
+def queue_status(user_id: Optional[int] = None) -> Dict[str, Dict[str, Any]]:
     """Get current status of the download queue."""
-    status = book_queue.get_status()
+    status = book_queue.get_status(user_id=user_id)
     for _, tasks in status.items():
         for _, task in tasks.items():
-            if task.download_path and not os.path.exists(task.download_path):
+            if task.download_path and not run_blocking_io(os.path.exists, task.download_path):
                 task.download_path = None
 
     # Convert Enum keys to strings and DownloadTask objects to dicts for JSON serialization
@@ -216,20 +230,6 @@ def get_book_data(task_id: str) -> Tuple[Optional[bytes], Optional[DownloadTask]
             task.download_path = None
         return None, task
 
-def _book_info_to_dict(book: BookInfo) -> Dict[str, Any]:
-    """Convert BookInfo to dict, transforming cover URLs for caching."""
-    result = {
-        key: value for key, value in book.__dict__.items()
-        if value is not None
-    }
-
-    # Transform external preview URLs to local proxy URLs
-    if result.get('preview'):
-        result['preview'] = transform_cover_url(result['preview'], book.id)
-
-    return result
-
-
 def _task_to_dict(task: DownloadTask) -> Dict[str, Any]:
     """Convert DownloadTask to dict for frontend, transforming cover URLs."""
     # Transform external preview URLs to local proxy URLs
@@ -251,9 +251,42 @@ def _task_to_dict(task: DownloadTask) -> Dict[str, Any]:
         'status': task.status,
         'status_message': task.status_message,
         'download_path': task.download_path,
+        'user_id': task.user_id,
+        'username': task.username,
+        'request_id': task.request_id,
     }
 
 
+def _clear_task_error_state(task: DownloadTask) -> None:
+    task.last_error_message = None
+    task.last_error_type = None
+
+
+def _capture_task_error(
+    task: DownloadTask,
+    *,
+    message: Optional[str] = None,
+    exc_type: Optional[str] = None,
+) -> None:
+    if isinstance(message, str):
+        normalized = message.strip()
+        if normalized:
+            task.last_error_message = normalized
+            book_queue.update_status_message(task.task_id, normalized)
+    if isinstance(exc_type, str):
+        normalized_type = exc_type.strip()
+        if normalized_type:
+            task.last_error_type = normalized_type
+
+
+def _format_download_exception_message(exc: Exception) -> str:
+    if isinstance(exc, PermissionError) and "/cwa-book-ingest" in str(exc):
+        return "Destination misconfigured. Go to Settings → Downloads to update."
+    if isinstance(exc, PermissionError):
+        return f"Permission denied: {exc}"
+    return f"Download failed: {type(exc).__name__}"
+
+
 def _download_task(task_id: str, cancel_flag: Event) -> Optional[str]:
     """Download a task via appropriate handler, then post-process to ingest."""
     try:
@@ -279,25 +312,57 @@ def _download_task(task_id: str, cancel_flag: Event) -> Optional[str]:
             update_download_progress(task_id, progress)
 
         def status_callback(status: str, message: Optional[str] = None) -> None:
+            status_key = status.lower()
+            if status_key == "error":
+                _capture_task_error(
+                    task,
+                    message=message or "Download failed",
+                    exc_type="StatusCallbackError",
+                )
+                return
+            # Don't propagate terminal statuses to the queue here. Output modules
+            # call status_callback("complete") before returning the download path,
+            # but _process_single_download needs to set download_path on the task
+            # first so the terminal hook captures it for history persistence.
+            if status_key in ("complete", "cancelled"):
+                if message is not None:
+                    book_queue.update_status_message(task_id, message)
+                return
             update_download_status(task_id, status, message)
 
         # Get the download handler based on the task's source
         handler = get_handler(task.source)
-        temp_path = handler.download(
-            task,
-            cancel_flag,
-            progress_callback,
-            status_callback
-        )
+        temp_file: Optional[Path] = None
 
-        # Handler returns temp path - orchestrator handles post-processing
-        if not temp_path:
-            return None
+        if task.staged_path:
+            staged_file = Path(task.staged_path)
+            if run_blocking_io(staged_file.exists):
+                temp_file = staged_file
+                logger.info("Task %s: reusing staged file for retry: %s", task_id, staged_file)
+            else:
+                task.staged_path = None
 
-        temp_file = Path(temp_path)
-        if not temp_file.exists():
-            logger.error(f"Handler returned non-existent path: {temp_path}")
-            return None
+        if temp_file is None:
+            temp_path = handler.download(
+                task,
+                cancel_flag,
+                progress_callback,
+                status_callback,
+            )
+
+            # Handler returns temp path - orchestrator handles post-processing
+            if not temp_path:
+                return None
+
+            temp_file = Path(temp_path)
+            if not run_blocking_io(temp_file.exists):
+                logger.error(f"Handler returned non-existent path: {temp_path}")
+                _capture_task_error(
+                    task,
+                    message=f"Download file missing: {temp_path}",
+                    exc_type="MissingDownloadPath",
+                )
+                return None
 
         # Check cancellation before post-processing
         if cancel_flag.is_set():
@@ -308,9 +373,17 @@ def _download_task(task_id: str, cancel_flag: Event) -> Optional[str]:
 
         logger.info("Task %s: download finished; starting post-processing", task_id)
         logger.debug("Task %s: post-processing input path: %s", task_id, temp_file)
+        task.staged_path = str(temp_file)
+        preserve_source_on_failure = True
 
         # Post-processing: output routing + file processing pipeline
-        result = post_process_download(temp_file, task, cancel_flag, status_callback)
+        result = post_process_download(
+            temp_file,
+            task,
+            cancel_flag,
+            status_callback,
+            preserve_source_on_failure=preserve_source_on_failure,
+        )
 
         if cancel_flag.is_set():
             logger.info("Task %s: post-processing cancelled", task_id)
@@ -319,12 +392,22 @@ def _download_task(task_id: str, cancel_flag: Event) -> Optional[str]:
             logger.debug("Task %s: post-processing result: %s", task_id, result)
         else:
             logger.warning("Task %s: post-processing failed", task_id)
+            if not task.last_error_message:
+                _capture_task_error(
+                    task,
+                    message="Download failed",
+                    exc_type="UnknownFailure",
+                )
 
         try:
             handler.post_process_cleanup(task, success=bool(result))
         except Exception as e:
             logger.warning("Post-processing cleanup hook failed for %s: %s", task_id, e)
 
+        if result:
+            task.staged_path = None
+            _clear_task_error_state(task)
+
         return result
 
     except Exception as e:
@@ -332,21 +415,13 @@ def _download_task(task_id: str, cancel_flag: Event) -> Optional[str]:
             logger.info("Task %s: cancelled during error handling", task_id)
         else:
             logger.error_trace("Task %s: error downloading: %s", task_id, e)
-            # Update task status so user sees the failure
             task = book_queue.get_task(task_id)
             if task:
-                book_queue.update_status(task_id, QueueStatus.ERROR)
-                # Check for known misconfiguration from earlier versions
-                if isinstance(e, PermissionError) and "/cwa-book-ingest" in str(e):
-                    book_queue.update_status_message(
-                        task_id,
-                        "Destination misconfigured. Go to Settings → Downloads to update."
-                    )
-                else:
-                    if isinstance(e, PermissionError):
-                        book_queue.update_status_message(task_id, f"Permission denied: {e}")
-                    else:
-                        book_queue.update_status_message(task_id, f"Download failed: {type(e).__name__}")
+                _capture_task_error(
+                    task,
+                    message=_format_download_exception_message(e),
+                    exc_type=type(e).__name__,
+                )
         return None
 
 
@@ -384,25 +459,16 @@ def update_download_progress(book_id: str, progress: float) -> None:
                 _progress_last_broadcast[f"{book_id}_progress"] = progress
         
         if should_broadcast:
-            ws_manager.broadcast_download_progress(book_id, progress, 'downloading')
+            task = book_queue.get_task(book_id)
+            task_user_id = task.user_id if task else None
+            ws_manager.broadcast_download_progress(book_id, progress, 'downloading', user_id=task_user_id)
 
 def update_download_status(book_id: str, status: str, message: Optional[str] = None) -> None:
     """Update download status with optional message for UI display."""
-    # Map string status to QueueStatus enum
-    status_map = {
-        'queued': QueueStatus.QUEUED,
-        'resolving': QueueStatus.RESOLVING,
-        'downloading': QueueStatus.DOWNLOADING,
-        'complete': QueueStatus.COMPLETE,
-        'available': QueueStatus.AVAILABLE,
-        'error': QueueStatus.ERROR,
-        'done': QueueStatus.DONE,
-        'cancelled': QueueStatus.CANCELLED,
-    }
-    
     status_key = status.lower()
-    queue_status_enum = status_map.get(status_key)
-    if not queue_status_enum:
+    try:
+        queue_status_enum = QueueStatus(status_key)
+    except ValueError:
         return
 
     # Always update activity timestamp (used by stall detection) even if the status
@@ -414,12 +480,13 @@ def update_download_status(book_id: str, status: str, message: Optional[str] = N
             return
         _last_status_event[book_id] = status_event
 
-    book_queue.update_status(book_id, queue_status_enum)
-
-    # Update status message if provided (empty string clears the message)
+    # Update status message first so terminal snapshots capture the final message
+    # (for example, "Complete" or "Sent to ...") instead of a stale in-progress one.
     if message is not None:
         book_queue.update_status_message(book_id, message)
 
+    book_queue.update_status(book_id, queue_status_enum)
+
     # Broadcast status update via WebSocket
     if ws_manager:
         ws_manager.broadcast_status_update(queue_status())
@@ -434,6 +501,38 @@ def cancel_download(book_id: str) -> bool:
     
     return result
 
+
+def retry_download(book_id: str) -> Tuple[bool, Optional[str]]:
+    """Retry a failed or cancelled download.
+
+    Request-linked downloads can only be retried when cancelled (errors
+    reopen the request for admin re-approval instead).
+    """
+    task = book_queue.get_task(book_id)
+    if task is None:
+        return False, "Download not found"
+
+    status = book_queue.get_task_status(book_id)
+    if status not in (QueueStatus.ERROR, QueueStatus.CANCELLED):
+        return False, "Download is not in an error or cancelled state"
+
+    if task.request_id and status != QueueStatus.CANCELLED:
+        return False, "Request-linked downloads must be retried from requests"
+
+    task.last_error_message = None
+    task.last_error_type = None
+    task.priority = -10
+
+    if not book_queue.enqueue_existing(book_id, priority=-10):
+        return False, "Failed to requeue download"
+
+    book_queue.update_status_message(book_id, "Retrying now")
+
+    if ws_manager:
+        ws_manager.broadcast_status_update(queue_status())
+
+    return True, None
+
 def set_book_priority(book_id: str, priority: int) -> bool:
     """Set priority for a queued book (lower = higher priority)."""
     return book_queue.set_priority(book_id, priority)
@@ -450,10 +549,6 @@ def get_active_downloads() -> List[str]:
     """Get list of currently active downloads."""
     return book_queue.get_active_downloads()
 
-def clear_completed() -> int:
-    """Clear all completed downloads from tracking."""
-    return book_queue.clear_completed()
-
 def _cleanup_progress_tracking(task_id: str) -> None:
     """Clean up progress tracking data for a completed/cancelled download."""
     with _progress_lock:
@@ -463,6 +558,24 @@ def _cleanup_progress_tracking(task_id: str) -> None:
         _last_status_event.pop(task_id, None)
 
 
+def _finalize_download_failure(task_id: str) -> None:
+    task = book_queue.get_task(task_id)
+    if not task:
+        return
+
+    message = task.last_error_message or task.status_message or ""
+    normalized_message = message.strip()
+    if not normalized_message:
+        normalized_message = (
+            f"Download failed: {task.last_error_type}"
+            if task.last_error_type
+            else "Download failed"
+        )
+
+    book_queue.update_status_message(task_id, normalized_message)
+    book_queue.update_status(task_id, QueueStatus.ERROR)
+
+
 def _process_single_download(task_id: str, cancel_flag: Event) -> None:
     """Process a single download job."""
     try:
@@ -482,12 +595,9 @@ def _process_single_download(task_id: str, cancel_flag: Event) -> None:
 
         if download_path:
             book_queue.update_download_path(task_id, download_path)
-            # Only update status if not already set (e.g., by archive extraction callback)
-            task = book_queue.get_task(task_id)
-            if not task or task.status != QueueStatus.COMPLETE:
-                book_queue.update_status(task_id, QueueStatus.COMPLETE)
+            book_queue.update_status(task_id, QueueStatus.COMPLETE)
         else:
-            book_queue.update_status(task_id, QueueStatus.ERROR)
+            _finalize_download_failure(task_id)
 
         # Broadcast final status (completed or error)
         if ws_manager:
@@ -499,11 +609,14 @@ def _process_single_download(task_id: str, cancel_flag: Event) -> None:
 
         if not cancel_flag.is_set():
             logger.error_trace(f"Error in download processing: {e}")
-            book_queue.update_status(task_id, QueueStatus.ERROR)
-            # Set error message if not already set by handler
             task = book_queue.get_task(task_id)
-            if task and not task.status_message:
-                book_queue.update_status_message(task_id, f"Download failed: {type(e).__name__}: {str(e)}")
+            if task:
+                _capture_task_error(
+                    task,
+                    message=f"Download failed: {type(e).__name__}: {str(e)}",
+                    exc_type=type(e).__name__,
+                )
+            _finalize_download_failure(task_id)
         else:
             logger.info(f"Download cancelled: {task_id}")
             book_queue.update_status(task_id, QueueStatus.CANCELLED)

shelfmark/download/outputs/__init__.py

@@ -8,7 +8,7 @@ from typing import Callable, Optional
 from shelfmark.core.models import DownloadTask
 
 StatusCallback = Callable[[str, Optional[str]], None]
-OutputHandler = Callable[[Path, DownloadTask, Event, StatusCallback], Optional[str]]
+OutputHandler = Callable[[Path, DownloadTask, Event, StatusCallback, bool], Optional[str]]
 
 
 @dataclass(frozen=True)
@@ -49,14 +49,55 @@ def load_output_handlers() -> None:
         return
 
     from . import booklore  # noqa: F401
+    from . import email  # noqa: F401
     from . import folder  # noqa: F401
 
     _OUTPUTS_LOADED = True
 
 
+def _normalize_output_mode(value: object) -> str:
+    return str(value or "").strip().lower()
+
+
+def _derive_output_mode(task: DownloadTask) -> str:
+    """Return the desired output mode for a task.
+
+    Prefer the mode captured at queue time. Fall back to current config for
+    legacy tasks that do not have `output_mode` populated.
+    """
+
+    mode = _normalize_output_mode(getattr(task, "output_mode", None))
+    if mode:
+        return mode
+
+    # Legacy / defensive fallback: derive from current config.
+    from shelfmark.core.config import config
+    from shelfmark.core.utils import is_audiobook as check_audiobook
+
+    if check_audiobook(getattr(task, "content_type", None)):
+        return "folder"
+
+    return _normalize_output_mode(config.get("BOOKS_OUTPUT_MODE", "folder")) or "folder"
+
+
 def resolve_output_handler(task: DownloadTask) -> Optional[OutputRegistration]:
     load_output_handlers()
+    desired_mode = _derive_output_mode(task)
+
+    # Prefer a direct mode match. `supports_task` becomes a capability check
+    # (e.g., prevent email/booklore for audiobooks).
+    for entry in _OUTPUT_REGISTRY:
+        if entry.mode == desired_mode and entry.supports_task(task):
+            return entry
+
+    # If the requested output isn't supported for this task, fall back to folder.
+    for entry in _OUTPUT_REGISTRY:
+        if entry.mode == "folder" and entry.supports_task(task):
+            return entry
+
+    # Last-resort fallback: keep the legacy "first supporting handler" behavior.
     for entry in _OUTPUT_REGISTRY:
         if entry.supports_task(task):
             return entry
+
     return None

shelfmark/download/outputs/booklore.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import os
 from dataclasses import dataclass
 from pathlib import Path
 from threading import Event
@@ -12,12 +13,14 @@ from shelfmark.core.logger import setup_logger
 from shelfmark.core.models import DownloadTask
 from shelfmark.core.utils import is_audiobook as check_audiobook
 from shelfmark.download.outputs import register_output
-from shelfmark.download.staging import STAGE_MOVE, STAGE_NONE, build_staging_dir
+from shelfmark.download.staging import STAGE_COPY, STAGE_MOVE, STAGE_NONE, build_staging_dir, get_staging_dir
 
 logger = setup_logger(__name__)
 
 BOOKLORE_OUTPUT_MODE = "booklore"
-BOOKLORE_SUPPORTED_EXTENSIONS = {".cb7", ".cbr", ".cbz", ".epub", ".fb2", ".pdf"}
+BOOKLORE_DESTINATION_LIBRARY = "library"
+BOOKLORE_DESTINATION_BOOKDROP = "bookdrop"
+BOOKLORE_SUPPORTED_EXTENSIONS = {".azw", ".azw3", ".cb7", ".cbr", ".cbz", ".epub", ".fb2", ".mobi", ".pdf"}
 BOOKLORE_SUPPORTED_FORMATS_LABEL = ", ".join(
     ext.lstrip(".").upper() for ext in sorted(BOOKLORE_SUPPORTED_EXTENSIONS)
 )
@@ -35,6 +38,7 @@ class BookloreConfig:
     library_id: int
     path_id: int
     verify_tls: bool = True
+    upload_to_bookdrop: bool = False
     refresh_after_upload: bool = False
 
 
@@ -47,7 +51,17 @@ def _parse_int(value: Any, label: str) -> int:
         raise BookloreError(f"{label} must be a number") from exc
 
 
-def build_booklore_config(values: Mapping[str, Any]) -> BookloreConfig:
+def _parse_destination(value: Any) -> str:
+    normalized = str(value or "").strip().lower()
+    if normalized == BOOKLORE_DESTINATION_BOOKDROP:
+        return BOOKLORE_DESTINATION_BOOKDROP
+    return BOOKLORE_DESTINATION_LIBRARY
+
+
+def build_booklore_config(
+    values: Mapping[str, Any],
+    user_id: Optional[int] = None,
+) -> BookloreConfig:
     base_url = str(values.get("BOOKLORE_HOST", "")).strip()
     username = str(values.get("BOOKLORE_USERNAME", "")).strip()
     password = values.get("BOOKLORE_PASSWORD", "") or ""
@@ -59,8 +73,32 @@ def build_booklore_config(values: Mapping[str, Any]) -> BookloreConfig:
     if not password:
         raise BookloreError("Booklore password is required")
 
-    library_id = _parse_int(values.get("BOOKLORE_LIBRARY_ID"), "Booklore library ID")
-    path_id = _parse_int(values.get("BOOKLORE_PATH_ID"), "Booklore path ID")
+    destination = _parse_destination(
+        values.get("BOOKLORE_DESTINATION", BOOKLORE_DESTINATION_LIBRARY)
+    )
+    upload_to_bookdrop = destination == BOOKLORE_DESTINATION_BOOKDROP
+
+    # Resolve library/path through config so user override precedence is centralized.
+    library_id = 0
+    path_id = 0
+    if not upload_to_bookdrop:
+        if user_id is not None:
+            library_id_val = core_config.config.get(
+                "BOOKLORE_LIBRARY_ID",
+                values.get("BOOKLORE_LIBRARY_ID"),
+                user_id=user_id,
+            )
+            path_id_val = core_config.config.get(
+                "BOOKLORE_PATH_ID",
+                values.get("BOOKLORE_PATH_ID"),
+                user_id=user_id,
+            )
+        else:
+            library_id_val = values.get("BOOKLORE_LIBRARY_ID")
+            path_id_val = values.get("BOOKLORE_PATH_ID")
+
+        library_id = _parse_int(library_id_val, "Booklore library ID")
+        path_id = _parse_int(path_id_val, "Booklore path ID")
 
     return BookloreConfig(
         base_url=base_url.rstrip("/"),
@@ -69,7 +107,8 @@ def build_booklore_config(values: Mapping[str, Any]) -> BookloreConfig:
         library_id=library_id,
         path_id=path_id,
         verify_tls=True,
-        refresh_after_upload=True,  # Always refresh library after upload
+        upload_to_bookdrop=upload_to_bookdrop,
+        refresh_after_upload=not upload_to_bookdrop,
     )
 
 
@@ -123,9 +162,14 @@ def booklore_list_libraries(booklore_config: BookloreConfig, token: str) -> list
 
 
 def booklore_upload_file(booklore_config: BookloreConfig, token: str, file_path: Path) -> None:
-    url = f"{booklore_config.base_url}/api/v1/files/upload"
+    if booklore_config.upload_to_bookdrop:
+        url = f"{booklore_config.base_url}/api/v1/files/upload/bookdrop"
+        params = None
+    else:
+        url = f"{booklore_config.base_url}/api/v1/files/upload"
+        params = {"libraryId": booklore_config.library_id, "pathId": booklore_config.path_id}
+
     headers = {"Authorization": f"Bearer {token}"}
-    params = {"libraryId": booklore_config.library_id, "pathId": booklore_config.path_id}
 
     response = None
 
@@ -166,9 +210,7 @@ def booklore_refresh_library(booklore_config: BookloreConfig, token: str) -> Non
 
 
 def _supports_booklore(task: DownloadTask) -> bool:
-    if check_audiobook(task.content_type):
-        return False
-    return core_config.config.get("BOOKS_OUTPUT_MODE", "folder") == BOOKLORE_OUTPUT_MODE
+    return not check_audiobook(task.content_type)
 
 
 def _get_booklore_settings() -> Dict[str, Any]:
@@ -176,6 +218,10 @@ def _get_booklore_settings() -> Dict[str, Any]:
         "BOOKLORE_HOST": core_config.config.get("BOOKLORE_HOST", ""),
         "BOOKLORE_USERNAME": core_config.config.get("BOOKLORE_USERNAME", ""),
         "BOOKLORE_PASSWORD": core_config.config.get("BOOKLORE_PASSWORD", ""),
+        "BOOKLORE_DESTINATION": core_config.config.get(
+            "BOOKLORE_DESTINATION",
+            BOOKLORE_DESTINATION_LIBRARY,
+        ),
         "BOOKLORE_LIBRARY_ID": core_config.config.get("BOOKLORE_LIBRARY_ID"),
         "BOOKLORE_PATH_ID": core_config.config.get("BOOKLORE_PATH_ID"),
     }
@@ -195,12 +241,16 @@ def _post_process_booklore(
     task: DownloadTask,
     cancel_flag: Event,
     status_callback,
+    preserve_source_on_failure: bool = False,
 ) -> Optional[str]:
     from shelfmark.download.postprocess.pipeline import (
+        CustomScriptContext,
         OutputPlan,
         cleanup_output_staging,
         is_managed_workspace_path,
+        maybe_run_custom_script,
         prepare_output_files,
+        safe_cleanup_path,
     )
 
     if cancel_flag.is_set():
@@ -208,7 +258,10 @@ def _post_process_booklore(
         return None
 
     try:
-        booklore_config = build_booklore_config(_get_booklore_settings())
+        booklore_config = build_booklore_config(
+            _get_booklore_settings(),
+            user_id=task.user_id,
+        )
     except BookloreError as e:
         logger.warning("Task %s: Booklore configuration error: %s", task.task_id, e)
         status_callback("error", str(e))
@@ -216,10 +269,15 @@ def _post_process_booklore(
 
     status_callback("resolving", "Preparing Booklore upload")
 
+    stage_action = STAGE_NONE
+    if is_managed_workspace_path(temp_file):
+        stage_action = STAGE_COPY if preserve_source_on_failure else STAGE_MOVE
+    staging_dir = build_staging_dir("booklore", task.task_id) if stage_action != STAGE_NONE else get_staging_dir()
+
     output_plan = OutputPlan(
         mode=BOOKLORE_OUTPUT_MODE,
-        stage_action=STAGE_MOVE if is_managed_workspace_path(temp_file) else STAGE_NONE,
-        staging_dir=build_staging_dir("booklore", task.task_id),
+        stage_action=stage_action,
+        staging_dir=staging_dir,
         allow_archive_extraction=True,
     )
 
@@ -229,12 +287,14 @@ def _post_process_booklore(
         BOOKLORE_OUTPUT_MODE,
         status_callback,
         output_plan=output_plan,
+        preserve_source_on_failure=preserve_source_on_failure,
     )
     if not prepared:
         return None
 
     logger.debug("Task %s: prepared %d file(s) for Booklore upload", task.task_id, len(prepared.files))
 
+    success = False
     try:
         unsupported_files = [
             file_path
@@ -265,10 +325,47 @@ def _post_process_booklore(
 
         logger.info("Task %s: uploaded %d file(s) to Booklore", task.task_id, len(prepared.files))
 
+        destination: Optional[Path]
+        if len(prepared.files) == 1:
+            destination = prepared.files[0].parent
+        else:
+            try:
+                destination = Path(os.path.commonpath([str(p.parent) for p in prepared.files]))
+            except ValueError:
+                destination = prepared.files[0].parent if prepared.files else None
+
+        script_context = CustomScriptContext(
+            task=task,
+            phase="post_upload",
+            output_mode=BOOKLORE_OUTPUT_MODE,
+            destination=destination,
+            final_paths=prepared.files,
+            output_details={
+                "booklore": {
+                    "base_url": booklore_config.base_url,
+                    "destination": (
+                        BOOKLORE_DESTINATION_BOOKDROP
+                        if booklore_config.upload_to_bookdrop
+                        else BOOKLORE_DESTINATION_LIBRARY
+                    ),
+                    "library_id": (
+                        None
+                        if booklore_config.upload_to_bookdrop
+                        else booklore_config.library_id
+                    ),
+                    "path_id": None if booklore_config.upload_to_bookdrop else booklore_config.path_id,
+                    "refresh_after_upload": bool(booklore_config.refresh_after_upload),
+                }
+            },
+        )
+        if not maybe_run_custom_script(script_context, status_callback=status_callback):
+            return None
+
         message = "Uploaded to Booklore"
         if len(prepared.files) > 1:
             message = f"Uploaded to Booklore ({len(prepared.files)} files)"
         status_callback("complete", message)
+        success = True
         return f"booklore://{task.task_id}"
 
     except BookloreError as e:
@@ -286,6 +383,8 @@ def _post_process_booklore(
             task,
             prepared.cleanup_paths,
         )
+        if preserve_source_on_failure and success:
+            safe_cleanup_path(temp_file, task)
 
 
 @register_output(BOOKLORE_OUTPUT_MODE, supports_task=_supports_booklore, priority=10)
@@ -294,5 +393,12 @@ def process_booklore_output(
     task: DownloadTask,
     cancel_flag: Event,
     status_callback,
+    preserve_source_on_failure: bool = False,
 ) -> Optional[str]:
-    return _post_process_booklore(temp_file, task, cancel_flag, status_callback)
+    return _post_process_booklore(
+        temp_file,
+        task,
+        cancel_flag,
+        status_callback,
+        preserve_source_on_failure=preserve_source_on_failure,
+    )

shelfmark/download/outputs/email.py

@@ -0,0 +1,444 @@
+from __future__ import annotations
+
+import mimetypes
+import smtplib
+import ssl
+from dataclasses import dataclass
+from email.message import EmailMessage
+from email.utils import formatdate, make_msgid, parseaddr
+from pathlib import Path
+from threading import Event
+from typing import Any, Dict, Mapping, Optional
+
+import shelfmark.core.config as core_config
+from shelfmark.core.logger import setup_logger
+from shelfmark.core.models import DownloadTask
+from shelfmark.core.utils import is_audiobook as check_audiobook
+from shelfmark.download.outputs import register_output
+from shelfmark.download.staging import STAGE_COPY, STAGE_MOVE, STAGE_NONE, build_staging_dir, get_staging_dir
+
+logger = setup_logger(__name__)
+
+EMAIL_OUTPUT_MODE = "email"
+
+SECURITY_NONE = "none"
+SECURITY_STARTTLS = "starttls"
+SECURITY_SSL = "ssl"
+ALLOWED_SECURITY = {SECURITY_NONE, SECURITY_STARTTLS, SECURITY_SSL}
+
+
+class EmailOutputError(Exception):
+    """Raised when the email output integration fails."""
+
+
+@dataclass(frozen=True)
+class EmailSmtpConfig:
+    host: str
+    port: int
+    security: str
+    username: str = ""
+    password: str = ""
+    from_addr: str = ""
+    timeout_seconds: int = 60
+    allow_unverified_tls: bool = False
+    subject_template: str = "{Title}"
+
+
+def _parse_int(value: Any, label: str, *, minimum: int = 1) -> int:
+    if value is None or value == "":
+        raise EmailOutputError(f"{label} is required")
+    try:
+        parsed = int(value)
+    except (TypeError, ValueError) as exc:
+        raise EmailOutputError(f"{label} must be a number") from exc
+    if parsed < minimum:
+        raise EmailOutputError(f"{label} must be >= {minimum}")
+    return parsed
+
+
+def build_email_smtp_config(values: Mapping[str, Any]) -> EmailSmtpConfig:
+    host = str(values.get("EMAIL_SMTP_HOST", "") or "").strip()
+    port = _parse_int(values.get("EMAIL_SMTP_PORT", 587), "SMTP port", minimum=1)
+
+    security = str(values.get("EMAIL_SMTP_SECURITY", SECURITY_STARTTLS) or "").strip().lower()
+    if security not in ALLOWED_SECURITY:
+        raise EmailOutputError(f"SMTP security must be one of: {', '.join(sorted(ALLOWED_SECURITY))}")
+
+    username = str(values.get("EMAIL_SMTP_USERNAME", "") or "").strip()
+    password = values.get("EMAIL_SMTP_PASSWORD", "") or ""
+
+    from_addr = str(values.get("EMAIL_FROM", "") or "").strip()
+    subject_template = str(values.get("EMAIL_SUBJECT_TEMPLATE", "{Title}") or "").strip()
+    timeout_seconds = _parse_int(values.get("EMAIL_SMTP_TIMEOUT_SECONDS", 60), "SMTP timeout (seconds)", minimum=1)
+    allow_unverified_tls = bool(values.get("EMAIL_ALLOW_UNVERIFIED_TLS", False))
+
+    if not host:
+        raise EmailOutputError("SMTP host is required")
+    if username and not password:
+        raise EmailOutputError("SMTP password is required when username is set")
+
+    if not from_addr:
+        # If From is not configured, fall back to the SMTP username if it is an email address.
+        username_email = parseaddr(username)[1]
+        if username_email and "@" in username_email:
+            from_addr = f"Shelfmark <{username_email}>"
+        else:
+            raise EmailOutputError("From address is required (or set SMTP username to an email address).")
+
+    return EmailSmtpConfig(
+        host=host,
+        port=port,
+        security=security,
+        username=username,
+        password=password,
+        from_addr=from_addr,
+        timeout_seconds=timeout_seconds,
+        allow_unverified_tls=allow_unverified_tls,
+        subject_template=subject_template or "{Title}",
+    )
+
+
+def _get_email_settings() -> Dict[str, Any]:
+    return {
+        "EMAIL_SMTP_HOST": core_config.config.get("EMAIL_SMTP_HOST", ""),
+        "EMAIL_SMTP_PORT": core_config.config.get("EMAIL_SMTP_PORT", 587),
+        "EMAIL_SMTP_SECURITY": core_config.config.get("EMAIL_SMTP_SECURITY", SECURITY_STARTTLS),
+        "EMAIL_SMTP_USERNAME": core_config.config.get("EMAIL_SMTP_USERNAME", ""),
+        "EMAIL_SMTP_PASSWORD": core_config.config.get("EMAIL_SMTP_PASSWORD", ""),
+        "EMAIL_FROM": core_config.config.get("EMAIL_FROM", ""),
+        "EMAIL_SUBJECT_TEMPLATE": core_config.config.get("EMAIL_SUBJECT_TEMPLATE", "{Title}"),
+        "EMAIL_SMTP_TIMEOUT_SECONDS": core_config.config.get("EMAIL_SMTP_TIMEOUT_SECONDS", 60),
+        "EMAIL_ALLOW_UNVERIFIED_TLS": core_config.config.get("EMAIL_ALLOW_UNVERIFIED_TLS", False),
+    }
+
+
+def _render_subject(template: str, task: DownloadTask) -> str:
+    mapping = {
+        "Author": task.author or "",
+        "Title": task.title or "",
+        "Year": task.year or "",
+        "Series": task.series_name or "",
+        "SeriesPosition": task.series_position or "",
+        "Subtitle": task.subtitle or "",
+        "Format": task.format or "",
+    }
+    try:
+        rendered = template.format(**mapping)
+    except Exception:
+        rendered = template
+
+    rendered = " ".join(str(rendered).split()).strip()
+    return rendered or "Shelfmark"
+
+
+def _msgid_domain(from_addr: str) -> str:
+    try:
+        from_email = parseaddr(from_addr)[1]
+        domain = (from_email.partition("@")[2] or "").strip().rstrip(">")
+    except Exception:
+        domain = ""
+    return domain or "shelfmark.local"
+
+
+def compose_email_message(
+    smtp_config: EmailSmtpConfig,
+    *,
+    task: DownloadTask,
+    recipient: str,
+    files: list[Path],
+) -> EmailMessage:
+    message = EmailMessage()
+    message["From"] = smtp_config.from_addr
+    message["To"] = recipient
+    message["Subject"] = _render_subject(smtp_config.subject_template, task)
+    message["Date"] = formatdate(localtime=True)
+    message["Message-ID"] = make_msgid(domain=_msgid_domain(smtp_config.from_addr))
+
+    # Keep email body empty; attachments carry the content.
+    message.set_content("")
+
+    for file_path in files:
+        filename = file_path.name
+        data = file_path.read_bytes()
+
+        content_type, encoding = mimetypes.guess_type(filename)
+        if content_type is None or encoding is not None:
+            content_type = "application/octet-stream"
+
+        main_type, sub_type = content_type.split("/", 1)
+        message.add_attachment(data, maintype=main_type, subtype=sub_type, filename=filename)
+
+    return message
+
+
+def _create_tls_context(allow_unverified: bool) -> ssl.SSLContext:
+    context = ssl.create_default_context()
+    if allow_unverified:
+        context.check_hostname = False
+        context.verify_mode = ssl.CERT_NONE
+    return context
+
+
+def test_smtp_connection(smtp_config: EmailSmtpConfig) -> None:
+    """Connect and (optionally) authenticate to the SMTP server. Does not send mail."""
+
+    smtp: Optional[smtplib.SMTP] = None
+    try:
+        if smtp_config.security == SECURITY_SSL:
+            context = _create_tls_context(smtp_config.allow_unverified_tls)
+            smtp = smtplib.SMTP_SSL(
+                smtp_config.host,
+                smtp_config.port,
+                timeout=smtp_config.timeout_seconds,
+                context=context,
+            )
+        else:
+            smtp = smtplib.SMTP(smtp_config.host, smtp_config.port, timeout=smtp_config.timeout_seconds)
+
+        smtp.ehlo()
+
+        if smtp_config.security == SECURITY_STARTTLS:
+            context = _create_tls_context(smtp_config.allow_unverified_tls)
+            smtp.starttls(context=context)
+            smtp.ehlo()
+
+        if smtp_config.username:
+            smtp.login(smtp_config.username, smtp_config.password)
+    except smtplib.SMTPAuthenticationError as exc:
+        raise EmailOutputError("SMTP authentication failed") from exc
+    except (smtplib.SMTPConnectError, smtplib.SMTPServerDisconnected, TimeoutError, OSError) as exc:
+        raise EmailOutputError(f"Could not connect to SMTP server: {exc}") from exc
+    finally:
+        if smtp is not None:
+            try:
+                smtp.quit()
+            except Exception:
+                try:
+                    smtp.close()
+                except Exception:
+                    pass
+
+
+def send_email_message(smtp_config: EmailSmtpConfig, message: EmailMessage) -> None:
+    smtp: Optional[smtplib.SMTP] = None
+    try:
+        if smtp_config.security == SECURITY_SSL:
+            context = _create_tls_context(smtp_config.allow_unverified_tls)
+            smtp = smtplib.SMTP_SSL(
+                smtp_config.host,
+                smtp_config.port,
+                timeout=smtp_config.timeout_seconds,
+                context=context,
+            )
+        else:
+            smtp = smtplib.SMTP(smtp_config.host, smtp_config.port, timeout=smtp_config.timeout_seconds)
+
+        smtp.ehlo()
+
+        if smtp_config.security == SECURITY_STARTTLS:
+            context = _create_tls_context(smtp_config.allow_unverified_tls)
+            smtp.starttls(context=context)
+            smtp.ehlo()
+
+        if smtp_config.username:
+            smtp.login(smtp_config.username, smtp_config.password)
+
+        smtp.send_message(message)
+    except smtplib.SMTPAuthenticationError as exc:
+        raise EmailOutputError("SMTP authentication failed") from exc
+    except (smtplib.SMTPException, TimeoutError, OSError) as exc:
+        raise EmailOutputError(f"Failed to send email: {exc}") from exc
+    finally:
+        if smtp is not None:
+            try:
+                smtp.quit()
+            except Exception:
+                try:
+                    smtp.close()
+                except Exception:
+                    pass
+
+
+def _supports_email(task: DownloadTask) -> bool:
+    return not check_audiobook(task.content_type)
+
+
+def _post_process_email(
+    temp_file: Path,
+    task: DownloadTask,
+    cancel_flag: Event,
+    status_callback,
+    preserve_source_on_failure: bool = False,
+) -> Optional[str]:
+    from shelfmark.download.postprocess.pipeline import (
+        CustomScriptContext,
+        OutputPlan,
+        cleanup_output_staging,
+        is_managed_workspace_path,
+        maybe_run_custom_script,
+        prepare_output_files,
+        safe_cleanup_path,
+    )
+
+    if cancel_flag.is_set():
+        logger.info("Task %s: cancelled before email send", task.task_id)
+        return None
+
+    try:
+        smtp_config = build_email_smtp_config(_get_email_settings())
+    except EmailOutputError as exc:
+        logger.warning("Task %s: email configuration error: %s", task.task_id, exc)
+        status_callback("error", str(exc))
+        return None
+
+    output_args = task.output_args or {}
+    if not isinstance(output_args, dict):
+        output_args = {}
+
+    recipient = str(output_args.get("to", "") or "").strip()
+    label = str(output_args.get("label", "") or "").strip() or recipient
+    if not recipient:
+        status_callback(
+            "error",
+            "No email recipient configured. Set a per-user email recipient or a default in Downloads -> Books.",
+        )
+        return None
+
+    status_callback("resolving", "Preparing email")
+
+    stage_action = STAGE_NONE
+    if is_managed_workspace_path(temp_file):
+        stage_action = STAGE_COPY if preserve_source_on_failure else STAGE_MOVE
+    staging_dir = build_staging_dir("email", task.task_id) if stage_action != STAGE_NONE else get_staging_dir()
+
+    output_plan = OutputPlan(
+        mode=EMAIL_OUTPUT_MODE,
+        stage_action=stage_action,
+        staging_dir=staging_dir,
+        allow_archive_extraction=True,
+    )
+
+    prepared = prepare_output_files(
+        temp_file,
+        task,
+        EMAIL_OUTPUT_MODE,
+        status_callback,
+        output_plan=output_plan,
+        preserve_source_on_failure=preserve_source_on_failure,
+    )
+    if not prepared:
+        return None
+
+    success = False
+    try:
+        limit_mb_raw = core_config.config.get("EMAIL_ATTACHMENT_SIZE_LIMIT_MB", 25)
+        try:
+            attachment_limit_mb = int(limit_mb_raw)
+        except (TypeError, ValueError):
+            attachment_limit_mb = 25
+
+        if attachment_limit_mb > 0:
+            limit_bytes = attachment_limit_mb * 1024 * 1024
+            file_sizes: list[tuple[Path, int]] = []
+            total_bytes = 0
+
+            for file_path in prepared.files:
+                try:
+                    size_bytes = file_path.stat().st_size
+                except OSError:
+                    continue
+                file_sizes.append((file_path, size_bytes))
+                total_bytes += size_bytes
+
+            too_large = [(path, size) for path, size in file_sizes if size > limit_bytes]
+            if too_large:
+                path, size = max(too_large, key=lambda item: item[1])
+                status_callback(
+                    "error",
+                    f"Attachment '{path.name}' is {size / (1024 * 1024):.1f} MB (limit {attachment_limit_mb} MB)",
+                )
+                return None
+
+            # Most providers enforce a message size limit and attachments are base64-encoded (~33% overhead).
+            estimated_encoded_bytes = int(total_bytes * 4 / 3)
+            if estimated_encoded_bytes > limit_bytes:
+                status_callback(
+                    "error",
+                    (
+                        f"Attachments total {total_bytes / (1024 * 1024):.1f} MB "
+                        f"(estimated encoded {estimated_encoded_bytes / (1024 * 1024):.1f} MB) "
+                        f"exceeds limit {attachment_limit_mb} MB"
+                    ),
+                )
+                return None
+
+        if cancel_flag.is_set():
+            logger.info("Task %s: cancelled before email send", task.task_id)
+            return None
+
+        status_callback("resolving", f"Sending email to {label}")
+        message = compose_email_message(
+            smtp_config,
+            task=task,
+            recipient=recipient,
+            files=prepared.files,
+        )
+        send_email_message(smtp_config, message)
+
+        script_context = CustomScriptContext(
+            task=task,
+            phase="post_email",
+            output_mode=EMAIL_OUTPUT_MODE,
+            destination=prepared.files[0].parent if prepared.files else None,
+            final_paths=prepared.files,
+            output_details={
+                "email": {
+                    "to": recipient,
+                    "label": label,
+                    "host": smtp_config.host,
+                    "port": smtp_config.port,
+                    "security": smtp_config.security,
+                }
+            },
+        )
+        if not maybe_run_custom_script(script_context, status_callback=status_callback):
+            return None
+
+        status_callback("complete", f"Sent to {label}")
+        success = True
+        return f"email://{task.task_id}"
+
+    except EmailOutputError as exc:
+        logger.warning("Task %s: email send failed: %s", task.task_id, exc)
+        status_callback("error", str(exc))
+        return None
+    except Exception as exc:
+        logger.error_trace("Task %s: unexpected error sending email: %s", task.task_id, exc)
+        status_callback("error", f"Email send failed: {exc}")
+        return None
+    finally:
+        cleanup_output_staging(
+            prepared.output_plan,
+            prepared.working_path,
+            task,
+            prepared.cleanup_paths,
+        )
+        if preserve_source_on_failure and success:
+            safe_cleanup_path(temp_file, task)
+
+
+@register_output(EMAIL_OUTPUT_MODE, supports_task=_supports_email, priority=10)
+def process_email_output(
+    temp_file: Path,
+    task: DownloadTask,
+    cancel_flag: Event,
+    status_callback,
+    preserve_source_on_failure: bool = False,
+) -> Optional[str]:
+    return _post_process_email(
+        temp_file,
+        task,
+        cancel_flag,
+        status_callback,
+        preserve_source_on_failure=preserve_source_on_failure,
+    )

shelfmark/download/outputs/folder.py

@@ -1,7 +1,6 @@
 from __future__ import annotations
 
 import os
-import subprocess
 from dataclasses import dataclass
 from pathlib import Path
 from threading import Event
@@ -11,7 +10,6 @@ import shelfmark.core.config as core_config
 from shelfmark.core.logger import setup_logger
 from shelfmark.core.models import DownloadTask
 from shelfmark.core.utils import is_audiobook as check_audiobook
-from shelfmark.download.archive import is_archive
 from shelfmark.download.outputs import register_output
 from shelfmark.download.staging import StageAction, STAGE_NONE
 
@@ -20,17 +18,9 @@ logger = setup_logger(__name__)
 FOLDER_OUTPUT_MODE = "folder"
 
 
-def _resolve_custom_script_target(target_path: Path, destination: Path, path_mode: str) -> Path:
-    mode = (path_mode or "absolute").strip().lower()
-    if mode != "relative":
-        return target_path
-
-    try:
-        return target_path.relative_to(destination)
-    except ValueError:
-        if target_path.is_absolute():
-            return Path(target_path.name)
-        return target_path
+def _format_op_counts(op_counts: dict[str, int]) -> str:
+    parts = [f"{op}={count}" for op, count in op_counts.items() if count]
+    return ", ".join(parts) if parts else "none"
 
 
 @dataclass(frozen=True)
@@ -46,9 +36,7 @@ class _ProcessingPlan:
 
 
 def _supports_folder_output(task: DownloadTask) -> bool:
-    if check_audiobook(task.content_type):
-        return True
-    return core_config.config.get("BOOKS_OUTPUT_MODE", FOLDER_OUTPUT_MODE) == FOLDER_OUTPUT_MODE
+    return True
 
 
 def _build_processing_plan(
@@ -100,15 +88,18 @@ def process_folder_output(
     task: DownloadTask,
     cancel_flag: Event,
     status_callback,
+    preserve_source_on_failure: bool = False,
 ) -> Optional[str]:
     """Post-process download to the configured folder destination."""
     from shelfmark.download.postprocess.pipeline import (
+        CustomScriptContext,
+        CustomScriptTransferSummary,
         cleanup_output_staging,
         is_torrent_source,
         log_plan_steps,
         prepare_output_files,
+        maybe_run_custom_script,
         record_step,
-        safe_cleanup_path,
         transfer_book_files,
     )
 
@@ -132,6 +123,7 @@ def process_folder_output(
         output_mode=plan.output_mode,
         status_callback=status_callback,
         destination=plan.destination,
+        preserve_source_on_failure=preserve_source_on_failure,
     )
     if not prepared:
         return None
@@ -141,73 +133,9 @@ def process_folder_output(
         step_name = f"stage_{prepared.output_plan.stage_action}"
         record_step(steps, step_name, source=str(temp_file), dest=str(prepared.output_plan.staging_dir))
 
-    def run_custom_script(script_path: str, target_path: Path, phase: str) -> bool:
-        path_mode = core_config.config.get("CUSTOM_SCRIPT_PATH_MODE", "absolute")
-        script_target = _resolve_custom_script_target(target_path, plan.destination, path_mode)
-        env = {
-            **os.environ,
-            "SHELFMARK_CUSTOM_SCRIPT_TARGET": str(target_path),
-            "SHELFMARK_CUSTOM_SCRIPT_RELATIVE": str(_resolve_custom_script_target(target_path, plan.destination, "relative")),
-            "SHELFMARK_CUSTOM_SCRIPT_DESTINATION": str(plan.destination),
-            "SHELFMARK_CUSTOM_SCRIPT_MODE": str(path_mode),
-            "SHELFMARK_CUSTOM_SCRIPT_PHASE": phase,
-        }
-        record_step(
-            steps,
-            "custom_script",
-            script=str(script_path),
-            target=str(script_target),
-            target_abs=str(target_path),
-            mode=str(path_mode),
-            phase=phase,
-        )
-        log_plan_steps(task.task_id, steps)
-        logger.info(
-            "Task %s: running custom script %s on %s (%s)",
-            task.task_id,
-            script_path,
-            script_target,
-            phase,
-        )
-        try:
-            result = subprocess.run(
-                [script_path, str(script_target)],
-                check=True,
-                timeout=300,  # 5 minute timeout
-                capture_output=True,
-                text=True,
-                env=env,
-            )
-            if result.stdout:
-                logger.debug("Task %s: custom script stdout: %s", task.task_id, result.stdout.strip())
-            return True
-        except FileNotFoundError:
-            logger.error("Task %s: custom script not found: %s", task.task_id, script_path)
-            status_callback("error", f"Custom script not found: {script_path}")
-            return False
-        except PermissionError:
-            logger.error("Task %s: custom script not executable: %s", task.task_id, script_path)
-            status_callback("error", f"Custom script not executable: {script_path}")
-            return False
-        except subprocess.TimeoutExpired:
-            logger.error("Task %s: custom script timed out after 300s: %s", task.task_id, script_path)
-            status_callback("error", "Custom script timed out")
-            return False
-        except subprocess.CalledProcessError as e:
-            stderr = e.stderr.strip() if e.stderr else "No error output"
-            logger.error(
-                "Task %s: custom script failed (exit code %s): %s",
-                task.task_id,
-                e.returncode,
-                stderr,
-            )
-            status_callback("error", f"Custom script failed: {stderr[:100]}")
-            return False
-
     # Custom script is run post-transfer (see below).
 
-    # If we staged a copy into TMP_DIR (e.g. for custom script), transfer from the staged
-    # path and disable hardlinking for this transfer.
+    # If we staged into TMP_DIR, transfer from the staged path and disable hardlinking.
     use_hardlink = plan.use_hardlink and prepared.output_plan.stage_action == STAGE_NONE
     source_path = plan.hardlink_source if use_hardlink and plan.hardlink_source else prepared.working_path
     is_torrent = is_torrent_source(source_path, task)
@@ -217,7 +145,7 @@ def process_folder_output(
 
     # For external usenet downloads, always copy from the client path.
     # "Move" is implemented as a client-side cleanup after import.
-    preserve_source = is_usenet
+    preserve_source = is_usenet or preserve_source_on_failure
 
     copy_for_label = is_torrent or preserve_source or prepared.output_plan.stage_action != STAGE_NONE
 
@@ -255,7 +183,7 @@ def process_folder_output(
         record_step(steps, "cleanup_staging", path=str(prepared.working_path))
     log_plan_steps(task.task_id, steps)
 
-    final_paths, error = transfer_book_files(
+    final_paths, error, op_counts = transfer_book_files(
         prepared.files,
         destination=plan.destination,
         task=task,
@@ -271,31 +199,44 @@ def process_folder_output(
         return None
 
     logger.info(
-        "Task %s: transferred %d file(s) to %s (%s)",
+        "Task %s: transferred %d file(s) to %s (ops: %s)",
         task.task_id,
         len(final_paths),
         plan.destination,
-        op_label.lower(),
+        _format_op_counts(op_counts),
+    )
+    if use_hardlink and op_counts.get("copy", 0):
+        logger.warning(
+            "Task %s: hardlink requested but %d of %d file(s) copied (fallback)",
+            task.task_id,
+            op_counts.get("copy", 0),
+            len(final_paths),
+        )
+
+    script_context = CustomScriptContext(
+        task=task,
+        phase="post_transfer",
+        output_mode=plan.output_mode,
+        organization_mode=plan.organization_mode,
+        destination=plan.destination,
+        final_paths=final_paths,
+        transfer=CustomScriptTransferSummary(
+            op_counts=op_counts,
+            use_hardlink=use_hardlink,
+            is_torrent=is_torrent,
+            preserve_source=preserve_source,
+        ),
     )
 
-    # Run custom script once per successful task, after transfer.
-    if core_config.config.CUSTOM_SCRIPT:
-        if len(final_paths) == 1:
-            target_path = final_paths[0]
-        else:
-            try:
-                target_path = Path(os.path.commonpath([str(p.parent) for p in final_paths]))
-            except ValueError:
-                target_path = plan.destination
-
-        if not run_custom_script(core_config.config.CUSTOM_SCRIPT, target_path, phase="post_transfer"):
+    if not maybe_run_custom_script(script_context, status_callback=status_callback, steps=steps):
+        if not preserve_source_on_failure:
             cleanup_output_staging(
                 prepared.output_plan,
                 prepared.working_path,
                 task,
                 prepared.cleanup_paths,
             )
-            return None
+        return None
 
     cleanup_output_staging(
         prepared.output_plan,

shelfmark/download/permissions_debug.py

@@ -16,6 +16,23 @@ from shelfmark.core.logger import setup_logger
 
 logger = setup_logger(__name__)
 
+def _run_io(func, *args, **kwargs):
+    """Best-effort offload for potentially blocking filesystem calls.
+
+    Keep this module import-cycle safe: `shelfmark.download.fs` imports this module,
+    so we only import `run_blocking_io` lazily at call-time.
+    """
+    try:
+        from shelfmark.download.fs import run_blocking_io as _run_blocking_io
+    except Exception:
+        return func(*args, **kwargs)
+
+    try:
+        return _run_blocking_io(func, *args, **kwargs)
+    except Exception:
+        # Fall back to direct call if threadpool offload is unavailable.
+        return func(*args, **kwargs)
+
 
 def _format_uid(uid: int) -> str:
     try:
@@ -59,12 +76,12 @@ def log_path_permission_context(label: str, path: Path) -> None:
 
         for probe in [path, path.parent]:
             try:
-                resolved = probe.resolve()
+                resolved = _run_io(probe.resolve)
             except Exception:
                 resolved = probe
 
             try:
-                st = probe.stat()
+                st = _run_io(probe.stat)
                 logger.debug(
                     "Path permissions (%s): path=%s resolved=%s mode=%s owner=%s(%d) group=%s(%d) dir=%s symlink=%s",
                     label,
@@ -75,8 +92,8 @@ def log_path_permission_context(label: str, path: Path) -> None:
                     st.st_uid,
                     _format_gid(st.st_gid),
                     st.st_gid,
-                    probe.is_dir(),
-                    probe.is_symlink(),
+                    _run_io(probe.is_dir),
+                    _run_io(probe.is_symlink),
                 )
             except Exception as stat_error:
                 logger.debug("Path permissions (%s): stat failed for %s: %s", label, probe, stat_error)
@@ -106,7 +123,7 @@ def log_transfer_permission_context(label: str, source: Path, dest: Path, error:
 
         for probe in [source, dest, dest.parent]:
             try:
-                st = probe.stat()
+                st = _run_io(probe.stat)
                 logger.debug(
                     "Path permissions (%s): path=%s mode=%s owner=%s(%d) group=%s(%d) exists=%s dir=%s",
                     label,
@@ -116,8 +133,8 @@ def log_transfer_permission_context(label: str, source: Path, dest: Path, error:
                     st.st_uid,
                     _format_gid(st.st_gid),
                     st.st_gid,
-                    probe.exists(),
-                    probe.is_dir(),
+                    _run_io(probe.exists),
+                    _run_io(probe.is_dir),
                 )
             except Exception as stat_error:
                 logger.debug("Path permissions (%s): stat failed for %s: %s", label, probe, stat_error)

shelfmark/download/postprocess/custom_script.py

@@ -0,0 +1,296 @@
+from __future__ import annotations
+
+import json
+import os
+import subprocess
+from dataclasses import dataclass, field
+from pathlib import Path
+from typing import Any, Optional
+
+import shelfmark.core.config as core_config
+from shelfmark.core.logger import setup_logger
+from shelfmark.core.models import DownloadTask
+from shelfmark.download.fs import run_blocking_io
+
+from .steps import log_plan_steps, record_step
+from .types import PlanStep
+
+logger = setup_logger(__name__)
+
+DEFAULT_CUSTOM_SCRIPT_TIMEOUT_SECONDS = 300  # 5 minutes
+
+
+def resolve_custom_script_target(target_path: Path, destination: Path, path_mode: str) -> Path:
+    """Resolve the path that should be passed as the custom script argument.
+
+    In absolute mode, we pass the full target path.
+
+    In relative mode, we pass a path relative to the destination folder. If the
+    target is not within the destination, fall back to just the filename to
+    avoid leaking unrelated absolute paths.
+    """
+
+    mode = (path_mode or "absolute").strip().lower()
+    if mode != "relative":
+        return target_path
+
+    try:
+        return target_path.relative_to(destination)
+    except ValueError:
+        if target_path.is_absolute():
+            return Path(target_path.name)
+    return target_path
+
+
+@dataclass(frozen=True)
+class CustomScriptExecution:
+    script_path: str
+    target_arg: Path
+    target_abs: Path
+    destination: Path
+    mode: str
+    phase: str
+    payload_json: Optional[str] = None
+
+
+@dataclass(frozen=True)
+class CustomScriptTransferSummary:
+    op_counts: dict[str, int]
+    use_hardlink: bool
+    is_torrent: bool
+    preserve_source: bool
+
+
+@dataclass(frozen=True)
+class CustomScriptContext:
+    task: DownloadTask
+    phase: str
+    output_mode: str
+    destination: Optional[Path] = None
+    final_paths: list[Path] = field(default_factory=list)
+    target_path: Optional[Path] = None
+    organization_mode: Optional[str] = None
+    transfer: Optional[CustomScriptTransferSummary] = None
+    output_details: dict[str, Any] = field(default_factory=dict)
+
+
+def prepare_custom_script_execution(
+    script_path: str,
+    *,
+    target_path: Path,
+    destination: Path,
+    path_mode: str,
+    phase: str,
+    payload: Optional[dict[str, Any]] = None,
+) -> CustomScriptExecution:
+    mode = (path_mode or "absolute").strip().lower()
+    if mode != "relative":
+        mode = "absolute"
+
+    target_arg = resolve_custom_script_target(target_path, destination, mode)
+    return CustomScriptExecution(
+        script_path=str(script_path),
+        target_arg=target_arg,
+        target_abs=target_path,
+        destination=destination,
+        mode=mode,
+        phase=phase,
+        payload_json=json.dumps(payload, indent=2, sort_keys=True) + "\n" if payload else None,
+    )
+
+
+def run_custom_script(
+    execution: CustomScriptExecution,
+    *,
+    task_id: str,
+    status_callback,
+    timeout_seconds: int = DEFAULT_CUSTOM_SCRIPT_TIMEOUT_SECONDS,
+) -> bool:
+    cwd: Optional[str] = None
+    if execution.mode == "relative":
+        # Make relative paths unambiguous by running the script from the destination folder.
+        cwd = str(execution.destination)
+
+    logger.info(
+        "Task %s: running custom script %s on %s (%s)",
+        task_id,
+        execution.script_path,
+        execution.target_arg,
+        execution.phase,
+    )
+
+    try:
+        # If we are not sending a JSON payload, close stdin so scripts that try
+        # to read it won't block indefinitely.
+        stdin = None if execution.payload_json is not None else subprocess.DEVNULL
+        result = run_blocking_io(
+            subprocess.run,
+            [execution.script_path, str(execution.target_arg)],
+            check=True,
+            timeout=timeout_seconds,
+            capture_output=True,
+            text=True,
+            cwd=cwd,
+            stdin=stdin,
+            input=execution.payload_json,
+        )
+        if result.stdout:
+            logger.debug("Task %s: custom script stdout: %s", task_id, result.stdout.strip())
+        return True
+    except FileNotFoundError:
+        logger.error("Task %s: custom script not found: %s", task_id, execution.script_path)
+        status_callback("error", f"Custom script not found: {execution.script_path}")
+        return False
+    except PermissionError:
+        logger.error("Task %s: custom script not executable: %s", task_id, execution.script_path)
+        status_callback("error", f"Custom script not executable: {execution.script_path}")
+        return False
+    except subprocess.TimeoutExpired:
+        logger.error(
+            "Task %s: custom script timed out after %ss: %s",
+            task_id,
+            timeout_seconds,
+            execution.script_path,
+        )
+        status_callback("error", "Custom script timed out")
+        return False
+    except subprocess.CalledProcessError as exc:
+        stderr = exc.stderr.strip() if exc.stderr else "No error output"
+        logger.error(
+            "Task %s: custom script failed (exit code %s): %s",
+            task_id,
+            exc.returncode,
+            stderr,
+        )
+        status_callback("error", f"Custom script failed: {stderr[:100]}")
+        return False
+
+
+def _choose_custom_script_target(
+    *,
+    explicit_target: Optional[Path],
+    destination: Optional[Path],
+    final_paths: list[Path],
+) -> Optional[Path]:
+    if explicit_target is not None:
+        return explicit_target
+
+    if len(final_paths) == 1:
+        return final_paths[0]
+
+    if len(final_paths) > 1:
+        try:
+            return Path(os.path.commonpath([str(p.parent) for p in final_paths]))
+        except ValueError:
+            return destination or final_paths[0].parent
+
+    return destination
+
+
+def _build_custom_script_payload(context: CustomScriptContext, *, target_path: Path) -> dict[str, Any]:
+    payload: dict[str, Any] = {
+        "version": 1,
+        "phase": context.phase,
+        "task": {
+            "task_id": context.task.task_id,
+            "source": context.task.source,
+            "search_mode": context.task.search_mode.value if context.task.search_mode else None,
+            "title": context.task.title,
+            "author": context.task.author,
+            "year": context.task.year,
+            "format": context.task.format,
+            "content_type": context.task.content_type,
+            "series_name": context.task.series_name,
+            "series_position": context.task.series_position,
+            "subtitle": context.task.subtitle,
+            "original_download_path": context.task.original_download_path,
+        },
+        "output": {
+            "mode": context.output_mode,
+            "organization_mode": context.organization_mode,
+        },
+        "paths": {
+            "destination": str(context.destination) if context.destination else None,
+            "target": str(target_path),
+            "final_paths": [str(p) for p in context.final_paths],
+        },
+    }
+
+    if context.output_details:
+        payload["output"]["details"] = context.output_details
+
+    if context.transfer:
+        payload["transfer"] = {
+            "op_counts": context.transfer.op_counts,
+            "use_hardlink": context.transfer.use_hardlink,
+            "is_torrent": context.transfer.is_torrent,
+            "preserve_source": context.transfer.preserve_source,
+        }
+
+    return payload
+
+
+def maybe_run_custom_script(
+    context: CustomScriptContext,
+    *,
+    status_callback,
+    steps: Optional[list[PlanStep]] = None,
+) -> bool:
+    """Run the custom script hook (if configured).
+
+    The output handler provides a `CustomScriptContext` describing what it did.
+    This function is responsible for choosing the script target, building the
+    optional JSON payload, and executing the script.
+    """
+
+    script_path = getattr(core_config.config, "CUSTOM_SCRIPT", None)
+    if not isinstance(script_path, str) or not script_path.strip():
+        return True
+
+    target_path = _choose_custom_script_target(
+        explicit_target=context.target_path,
+        destination=context.destination,
+        final_paths=context.final_paths,
+    )
+    if not target_path:
+        logger.warning(
+            "Task %s: custom script configured but no target could be determined; skipping",
+            context.task.task_id,
+        )
+        return True
+
+    path_mode = core_config.config.get("CUSTOM_SCRIPT_PATH_MODE", "absolute")
+
+    payload: Optional[dict[str, Any]] = None
+    if core_config.config.get("CUSTOM_SCRIPT_JSON_PAYLOAD", False):
+        payload = _build_custom_script_payload(context, target_path=target_path)
+
+    # If no destination is available for this output, fall back to the target's
+    # parent directory so the script can still run consistently.
+    execution_destination = context.destination or target_path.parent
+
+    execution = prepare_custom_script_execution(
+        script_path,
+        target_path=target_path,
+        destination=execution_destination,
+        path_mode=path_mode,
+        phase=context.phase,
+        payload=payload,
+    )
+
+    if steps is not None:
+        payload_bytes = len(execution.payload_json.encode("utf-8")) if execution.payload_json else 0
+        record_step(
+            steps,
+            "custom_script",
+            script=str(execution.script_path),
+            target=str(execution.target_arg),
+            target_abs=str(execution.target_abs),
+            mode=str(execution.mode),
+            phase=str(execution.phase),
+            payload_stdin=bool(execution.payload_json),
+            payload_bytes=payload_bytes,
+        )
+        log_plan_steps(context.task.task_id, steps)
+
+    return run_custom_script(execution, task_id=context.task.task_id, status_callback=status_callback)

shelfmark/download/postprocess/destination.py

@@ -6,11 +6,12 @@ from pathlib import Path
 from shelfmark.core.logger import setup_logger
 from shelfmark.core.models import DownloadTask
 from shelfmark.core.utils import (
-    get_aa_content_type_dir,
     get_destination,
     is_audiobook as check_audiobook,
 )
+from shelfmark.download.fs import run_blocking_io
 from shelfmark.download.permissions_debug import log_path_permission_context
+from shelfmark.release_sources import get_source
 
 logger = setup_logger("shelfmark.download.postprocess.pipeline")
 
@@ -23,14 +24,15 @@ def validate_destination(destination: Path, status_callback) -> bool:
         status_callback("error", f"Destination must be absolute: {destination}")
         return False
 
-    if destination.exists() and not destination.is_dir():
+    destination_exists = run_blocking_io(destination.exists)
+    if destination_exists and not run_blocking_io(destination.is_dir):
         logger.warning(f"Destination is not a directory: {destination}")
         status_callback("error", f"Destination is not a directory: {destination}")
         return False
 
-    if not destination.exists():
+    if not destination_exists:
         try:
-            destination.mkdir(parents=True, exist_ok=True)
+            run_blocking_io(destination.mkdir, parents=True, exist_ok=True)
         except (OSError, PermissionError) as exc:
             log_path_permission_context("destination_create", destination)
             logger.warning(f"Cannot create destination: {destination} ({exc})")
@@ -44,8 +46,8 @@ def validate_destination(destination: Path, status_callback) -> bool:
             f"This file was created to verify if '{destination}' is writable. "
             "It should've been automatically deleted. Feel free to delete it.\n"
         )
-        test_path.write_text(test_content)
-        test_path.unlink(missing_ok=True)
+        run_blocking_io(test_path.write_text, test_content)
+        run_blocking_io(test_path.unlink, missing_ok=True)
     except Exception as exc:
         logger.debug("Destination write probe path: %s", test_path)
         log_path_permission_context("destination_write_probe", destination)
@@ -61,9 +63,12 @@ def get_final_destination(task: DownloadTask) -> Path:
 
     is_audiobook = check_audiobook(task.content_type)
 
-    if task.source == "direct_download" and not is_audiobook:
-        override = get_aa_content_type_dir(task.content_type)
-        if override:
-            return override
+    try:
+        override = get_source(task.source).get_destination_override(task)
+    except ValueError:
+        override = None
 
-    return get_destination(is_audiobook)
+    if override:
+        return override
+
+    return get_destination(is_audiobook, user_id=task.user_id, username=task.username)

shelfmark/download/postprocess/pipeline.py

@@ -17,6 +17,15 @@ implementation stay modular.
 
 from __future__ import annotations
 
+from .custom_script import (
+    CustomScriptExecution,
+    CustomScriptContext,
+    CustomScriptTransferSummary,
+    maybe_run_custom_script,
+    prepare_custom_script_execution,
+    resolve_custom_script_target,
+    run_custom_script,
+)
 from .destination import get_final_destination, validate_destination
 from .prepare import build_output_plan, prepare_output_files
 from .scan import (
@@ -50,6 +59,9 @@ __all__ = [
     "PlanStep",
     "PreparedFiles",
     "TransferPlan",
+    "CustomScriptExecution",
+    "CustomScriptContext",
+    "CustomScriptTransferSummary",
     "build_metadata_dict",
     "build_output_plan",
     "cleanup_output_staging",
@@ -62,10 +74,13 @@ __all__ = [
     "is_torrent_source",
     "is_within_tmp_dir",
     "log_plan_steps",
+    "maybe_run_custom_script",
     "prepare_output_files",
+    "prepare_custom_script_execution",
     "process_directory",
     "record_step",
     "resolve_hardlink_source",
+    "resolve_custom_script_target",
     "safe_cleanup_path",
     "scan_directory_tree",
     "should_hardlink",
@@ -73,4 +88,5 @@ __all__ = [
     "transfer_directory_to_library",
     "transfer_file_to_library",
     "validate_destination",
+    "run_custom_script",
 ]

shelfmark/download/postprocess/prepare.py

@@ -3,10 +3,8 @@ from __future__ import annotations
 from pathlib import Path
 from typing import Optional
 
-import shelfmark.core.config as core_config
 from shelfmark.core.logger import setup_logger
 from shelfmark.core.models import DownloadTask
-from shelfmark.download.archive import is_archive
 from shelfmark.download.staging import STAGE_COPY, STAGE_NONE, get_staging_dir, stage_path
 
 from .scan import collect_staged_files
@@ -27,14 +25,11 @@ def build_output_plan(
     """Build an output plan that describes staging behavior for file-based outputs."""
 
     transfer_plan = resolve_hardlink_source(temp_file, task, destination, status_callback)
-    runs_custom_script = bool(core_config.config.CUSTOM_SCRIPT) and temp_file.is_file() and not is_archive(temp_file)
-
-    stage_action = STAGE_COPY if runs_custom_script and not is_managed_workspace_path(temp_file) else STAGE_NONE
     staging_dir = get_staging_dir()
 
     return OutputPlan(
         mode=output_mode,
-        stage_action=stage_action,
+        stage_action=STAGE_NONE,
         staging_dir=staging_dir,
         allow_archive_extraction=transfer_plan.allow_archive_extraction,
         transfer_plan=transfer_plan,
@@ -48,6 +43,7 @@ def prepare_output_files(
     status_callback,
     destination: Optional[Path] = None,
     output_plan: Optional[OutputPlan] = None,
+    preserve_source_on_failure: bool = False,
 ) -> Optional[PreparedFiles]:
     if output_plan is None:
         output_plan = build_output_plan(
@@ -64,19 +60,23 @@ def prepare_output_files(
         status_callback("resolving", step_label)
         working_path = stage_path(working_path, output_plan.staging_dir, output_plan.stage_action)
 
-    can_delete_source_archives = output_plan.stage_action != STAGE_NONE or is_managed_workspace_path(working_path)
+    can_delete_source_archives = output_plan.stage_action != STAGE_NONE or is_managed_workspace_path(
+        working_path
+    )
+    cleanup_archives = can_delete_source_archives and not preserve_source_on_failure
 
     files, rejected_files, cleanup_paths, error = collect_staged_files(
         working_path=working_path,
         task=task,
         allow_archive_extraction=output_plan.allow_archive_extraction,
         status_callback=status_callback,
-        cleanup_archives=can_delete_source_archives,
+        cleanup_archives=cleanup_archives,
     )
 
     if error:
         status_callback("error", error)
-        cleanup_output_staging(output_plan, working_path, task, cleanup_paths)
+        if not preserve_source_on_failure:
+            cleanup_output_staging(output_plan, working_path, task, cleanup_paths)
         return None
 
     if output_plan.stage_action == STAGE_NONE and is_managed_workspace_path(working_path):

shelfmark/download/postprocess/router.py

@@ -26,6 +26,7 @@ def post_process_download(
     task: DownloadTask,
     cancel_flag: Event,
     status_callback,
+    preserve_source_on_failure: bool = False,
 ) -> Optional[str]:
     """Post-process download using the selected output handler."""
 
@@ -44,9 +45,21 @@ def post_process_download(
     output_handler = resolve_output_handler(task)
     if output_handler:
         logger.info("Task %s: using output mode %s", task.task_id, output_handler.mode)
-        return output_handler.handler(temp_file, task, cancel_flag, status_callback)
+        return output_handler.handler(
+            temp_file,
+            task,
+            cancel_flag,
+            status_callback,
+            preserve_source_on_failure,
+        )
 
     from shelfmark.download.outputs.folder import process_folder_output
 
     logger.info("Task %s: using output mode folder", task.task_id)
-    return process_folder_output(temp_file, task, cancel_flag, status_callback)
+    return process_folder_output(
+        temp_file,
+        task,
+        cancel_flag,
+        status_callback,
+        preserve_source_on_failure,
+    )

shelfmark/download/postprocess/scan.py

@@ -8,6 +8,7 @@ from shelfmark.core.logger import setup_logger
 from shelfmark.core.models import DownloadTask
 from shelfmark.core.utils import is_audiobook as check_audiobook
 from shelfmark.download.archive import ArchiveExtractionError, extract_archive, is_archive
+from shelfmark.download.fs import run_blocking_io
 from shelfmark.download.permissions_debug import log_path_permission_context
 from shelfmark.download.postprocess.policy import (
     get_supported_audiobook_formats,
@@ -55,7 +56,12 @@ def extract_archive_files(
     content_type = task.content_type
 
     try:
-        extracted_files, warnings, rejected_files = extract_archive(archive_path, output_dir, content_type)
+        extracted_files, warnings, rejected_files = run_blocking_io(
+            extract_archive,
+            archive_path,
+            output_dir,
+            content_type,
+        )
     except ArchiveExtractionError as exc:
         logger.warning(
             "Task %s: archive extraction failed for %s: %s",
@@ -74,7 +80,7 @@ def extract_archive_files(
         )
 
     if cleanup_archive:
-        archive_path.unlink(missing_ok=True)
+        run_blocking_io(archive_path.unlink, missing_ok=True)
 
     cleanup_paths = [output_dir]
 
@@ -101,8 +107,12 @@ def scan_directory_tree(
     """Scan a directory tree for book files, trackable-but-unsupported files, and archives."""
 
     try:
-        with os.scandir(directory) as it:
-            next(it, None)
+        def _probe_dir() -> None:
+            # Force a fast error if the dir is missing/inaccessible.
+            with os.scandir(directory) as it:
+                next(it, None)
+
+        run_blocking_io(_probe_dir)
     except PermissionError as exc:
         log_path_permission_context("scan_directory", directory)
         logger.warning(f"Permission denied scanning directory: {directory} ({exc})")
@@ -111,10 +121,6 @@ def scan_directory_tree(
         logger.warning(f"Cannot access download folder: {directory} ({exc})")
         return [], [], [], f"Cannot access download folder: {directory} ({exc})"
 
-    book_files: List[Path] = []
-    rejected_files: List[Path] = []
-    archive_files: List[Path] = []
-
     supported_formats = get_supported_formats(content_type)
     supported_exts = {f".{fmt}" for fmt in supported_formats}
 
@@ -146,18 +152,35 @@ def scan_directory_tree(
         else:
             logger.debug(f"Error scanning directory tree: {error}")
 
-    for root, _, files in os.walk(directory, onerror=onerror):
-        for filename in files:
-            file_path = Path(root) / filename
-            suffix = file_path.suffix.lower()
+    def _walk_tree() -> Tuple[List[Path], List[Path], List[Path]]:
+        book_files: List[Path] = []
+        rejected_files: List[Path] = []
+        archive_files: List[Path] = []
 
-            if suffix in supported_exts:
-                book_files.append(file_path)
-            elif suffix in trackable_exts:
-                rejected_files.append(file_path)
+        for root, _, files in os.walk(directory, onerror=onerror):
+            for filename in files:
+                file_path = Path(root) / filename
+                suffix = file_path.suffix.lower()
 
-            if is_archive(file_path):
-                archive_files.append(file_path)
+                if suffix in supported_exts:
+                    book_files.append(file_path)
+                elif suffix in trackable_exts:
+                    rejected_files.append(file_path)
+
+                if is_archive(file_path):
+                    archive_files.append(file_path)
+
+        return book_files, rejected_files, archive_files
+
+    try:
+        book_files, rejected_files, archive_files = run_blocking_io(_walk_tree)
+    except PermissionError as exc:
+        log_path_permission_context("scan_directory_walk", directory)
+        logger.warning(f"Permission denied scanning directory: {directory} ({exc})")
+        return [], [], [], f"Permission denied accessing download folder: {directory}"
+    except (FileNotFoundError, NotADirectoryError, OSError) as exc:
+        logger.warning(f"Cannot access download folder: {directory} ({exc})")
+        return [], [], [], f"Cannot access download folder: {directory} ({exc})"
 
     return book_files, rejected_files, archive_files, None
 
@@ -194,12 +217,15 @@ def collect_directory_files(
 
     if archive_files:
         if not allow_archive_extraction:
-            logger.warning(
-                "Task %s: archive extraction disabled (torrent hardlinking enabled) for %s",
+            # When extraction is disabled (typically due to torrent hardlinking),
+            # treat archives as the final importable "files" rather than failing.
+            logger.info(
+                "Task %s: archive extraction disabled; importing %d archive(s) as-is from %s",
                 task.task_id,
+                len(archive_files),
                 directory,
             )
-            return [], rejected_files, [], "Archive extraction is disabled when torrent hardlinking is enabled"
+            return archive_files, rejected_files, [], None
 
         if status_callback:
             status_callback("resolving", "Extracting archives")
@@ -258,7 +284,7 @@ def collect_staged_files(
     status_callback,
     cleanup_archives: bool,
 ) -> Tuple[List[Path], List[Path], List[Path], Optional[str]]:
-    if working_path.is_dir():
+    if run_blocking_io(working_path.is_dir):
         if status_callback:
             status_callback("resolving", "Processing download folder")
         return collect_directory_files(
@@ -293,6 +319,11 @@ def collect_staged_files(
 
         return extracted_files, rejected_files, cleanup_paths, error
 
+    if is_archive(working_path) and not allow_archive_extraction:
+        # When extraction is disabled (typically due to torrent hardlinking),
+        # import the archive as-is rather than treating it as an unsupported file.
+        return [working_path], [], [], None
+
     # Single-file download result (non-archive).
     # Ensure we respect the user's supported format settings.
     suffix = working_path.suffix.lower()

shelfmark/download/postprocess/transfer.py

@@ -2,7 +2,7 @@ from __future__ import annotations
 
 import os
 from pathlib import Path
-from typing import List, Optional, Tuple
+from typing import Dict, List, Optional, Tuple
 
 import shelfmark.core.config as core_config
 from shelfmark.core.logger import setup_logger
@@ -15,7 +15,7 @@ from shelfmark.core.naming import (
     sanitize_filename,
 )
 from shelfmark.core.utils import is_audiobook as check_audiobook
-from shelfmark.download.fs import atomic_copy, atomic_hardlink, atomic_move
+from shelfmark.download.fs import atomic_copy, atomic_hardlink, atomic_move, run_blocking_io
 from shelfmark.download.postprocess.policy import get_file_organization, get_template
 
 from .scan import collect_directory_files, scan_directory_tree
@@ -53,9 +53,18 @@ def build_metadata_dict(task: DownloadTask) -> dict:
         "Year": task.year,
         "Series": task.series_name,
         "SeriesPosition": task.series_position,
+        "User": task.username,
     }
 
 
+def build_file_metadata(task: DownloadTask, source_file: Path, part_number: Optional[str] = None) -> dict:
+    metadata = build_metadata_dict(task)
+    metadata["OriginalName"] = source_file.stem
+    if part_number is not None:
+        metadata["PartNumber"] = part_number
+    return metadata
+
+
 def resolve_hardlink_source(
     temp_file: Path,
     task: DownloadTask,
@@ -70,10 +79,11 @@ def resolve_hardlink_source(
 
     if hardlink_enabled and task.original_download_path:
         hardlink_source = Path(task.original_download_path)
-        if destination and hardlink_source.exists() and same_filesystem(hardlink_source, destination):
+        hardlink_source_exists = run_blocking_io(hardlink_source.exists)
+        if destination and hardlink_source_exists and run_blocking_io(same_filesystem, hardlink_source, destination):
             use_hardlink = True
             source_path = hardlink_source
-        elif hardlink_source.exists():
+        elif hardlink_source_exists:
             logger.warning(
                 f"Cannot hardlink: {hardlink_source} and {destination} are on different filesystems. "
                 "Falling back to copy. To fix: ensure torrent client downloads to same filesystem as destination."
@@ -97,7 +107,7 @@ def is_torrent_source(source_path: Path, task: DownloadTask) -> bool:
 
     original_path = Path(task.original_download_path)
     try:
-        return source_path.resolve() == original_path.resolve()
+        return run_blocking_io(source_path.resolve) == run_blocking_io(original_path.resolve)
     except (OSError, ValueError):
         try:
             return os.path.normpath(str(source_path)) == os.path.normpath(str(original_path))
@@ -122,7 +132,7 @@ def _transfer_single_file(
     if use_hardlink:
         final_path = atomic_hardlink(source_path, dest_path, max_attempts=max_attempts)
         try:
-            if os.stat(source_path).st_ino == os.stat(final_path).st_ino:
+            if run_blocking_io(source_path.stat).st_ino == run_blocking_io(final_path.stat).st_ino:
                 return final_path, "hardlink"
         except OSError:
             return final_path, "hardlink"
@@ -142,25 +152,32 @@ def transfer_book_files(
     is_torrent: bool,
     preserve_source: bool = False,
     organization_mode: Optional[str] = None,
-) -> Tuple[List[Path], Optional[str]]:
+) -> Tuple[List[Path], Optional[str], Dict[str, int]]:
     if not book_files:
-        return [], "No book files found"
+        return [], "No book files found", {"hardlink": 0, "copy": 0, "move": 0}
 
     is_audiobook = check_audiobook(task.content_type)
     organization_mode = organization_mode or get_file_organization(is_audiobook)
     max_attempts = _max_attempts_for_batch(len(book_files))
 
     final_paths: List[Path] = []
+    op_counts: Dict[str, int] = {"hardlink": 0, "copy": 0, "move": 0}
 
     if organization_mode == "organize":
         template = get_template(is_audiobook, "organize")
-        metadata = build_metadata_dict(task)
 
         if len(book_files) == 1:
             source_file = book_files[0]
             ext = source_file.suffix.lstrip(".") or task.format or ""
-            dest_path = build_library_path(str(destination), template, metadata, extension=ext or None)
-            dest_path.parent.mkdir(parents=True, exist_ok=True)
+            file_metadata = build_file_metadata(task, source_file)
+            dest_path = run_blocking_io(
+                build_library_path,
+                str(destination),
+                template,
+                file_metadata,
+                extension=ext or None,
+            )
+            run_blocking_io(dest_path.parent.mkdir, parents=True, exist_ok=True)
 
             final_path, op = _transfer_single_file(
                 source_file,
@@ -171,6 +188,7 @@ def transfer_book_files(
                 max_attempts=max_attempts,
             )
             final_paths.append(final_path)
+            op_counts[op] = op_counts.get(op, 0) + 1
             logger.debug(f"{op.capitalize()} to destination: {final_path.name}")
         else:
             zero_pad_width = max(len(str(len(book_files))), 2)
@@ -178,9 +196,15 @@ def transfer_book_files(
 
             for source_file, part_number in files_with_parts:
                 ext = source_file.suffix.lstrip(".") or task.format or ""
-                file_metadata = {**metadata, "PartNumber": part_number}
-                dest_path = build_library_path(str(destination), template, file_metadata, extension=ext or None)
-                dest_path.parent.mkdir(parents=True, exist_ok=True)
+                file_metadata = build_file_metadata(task, source_file, part_number=part_number)
+                dest_path = run_blocking_io(
+                    build_library_path,
+                    str(destination),
+                    template,
+                    file_metadata,
+                    extension=ext or None,
+                )
+                run_blocking_io(dest_path.parent.mkdir, parents=True, exist_ok=True)
 
                 final_path, op = _transfer_single_file(
                     source_file,
@@ -191,9 +215,10 @@ def transfer_book_files(
                     max_attempts=max_attempts,
                 )
                 final_paths.append(final_path)
+                op_counts[op] = op_counts.get(op, 0) + 1
                 logger.debug(f"{op.capitalize()} to destination: {final_path.name}")
 
-        return final_paths, None
+        return final_paths, None, op_counts
 
     for book_file in book_files:
         if len(book_files) == 1 and organization_mode != "none":
@@ -201,7 +226,7 @@ def transfer_book_files(
                 task.format = book_file.suffix.lower().lstrip(".")
 
             template = get_template(is_audiobook, "rename")
-            metadata = build_metadata_dict(task)
+            metadata = build_file_metadata(task, book_file)
             extension = book_file.suffix.lstrip(".") or task.format or ""
 
             filename = parse_naming_template(template, metadata, allow_path_separators=False)
@@ -223,9 +248,10 @@ def transfer_book_files(
             max_attempts=max_attempts,
         )
         final_paths.append(final_path)
+        op_counts[op] = op_counts.get(op, 0) + 1
         logger.debug(f"{op.capitalize()} to destination: {final_path.name}")
 
-    return final_paths, None
+    return final_paths, None, op_counts
 
 
 def process_directory(
@@ -257,7 +283,7 @@ def process_directory(
         if use_hardlink is None:
             use_hardlink = should_hardlink(task)
 
-        final_paths, error = transfer_book_files(
+        final_paths, error, _op_counts = transfer_book_files(
             book_files,
             destination=ingest_dir,
             task=task,
@@ -293,8 +319,10 @@ def transfer_file_to_library(
     use_hardlink: bool,
 ) -> Optional[str]:
     extension = source_path.suffix.lstrip(".") or task.format
-    dest_path = build_library_path(library_base, template, metadata, extension)
-    dest_path.parent.mkdir(parents=True, exist_ok=True)
+    template_metadata = dict(metadata)
+    template_metadata.setdefault("OriginalName", source_path.stem)
+    dest_path = run_blocking_io(build_library_path, library_base, template, template_metadata, extension)
+    run_blocking_io(dest_path.parent.mkdir, parents=True, exist_ok=True)
 
     is_torrent = is_torrent_source(source_path, task)
     final_path, op = _transfer_single_file(
@@ -305,6 +333,12 @@ def transfer_file_to_library(
         max_attempts=_max_attempts_for_batch(1),
     )
     logger.info(f"Library {op}: {final_path}")
+    if use_hardlink and op != "hardlink":
+        logger.warning(
+            "Library hardlink requested but %s used instead for %s",
+            op,
+            final_path,
+        )
 
     if use_hardlink and temp_file and not is_torrent_source(temp_file, task):
         safe_cleanup_path(temp_file, task)
@@ -339,11 +373,18 @@ def transfer_directory_to_library(
             safe_cleanup_path(temp_file, task)
         return None
 
-    base_library_path = build_library_path(library_base, template, metadata, extension=None)
-    base_library_path.parent.mkdir(parents=True, exist_ok=True)
+    base_library_path = run_blocking_io(
+        build_library_path,
+        library_base,
+        template,
+        metadata,
+        extension=None,
+    )
+    run_blocking_io(base_library_path.parent.mkdir, parents=True, exist_ok=True)
 
     is_torrent = is_torrent_source(source_dir, task)
     transferred_paths: List[Path] = []
+    op_counts: Dict[str, int] = {"hardlink": 0, "copy": 0, "move": 0}
     max_attempts = _max_attempts_for_batch(len(source_files))
 
     if len(source_files) == 1:
@@ -359,6 +400,7 @@ def transfer_directory_to_library(
         )
         logger.debug(f"Library {op}: {source_file.name} -> {final_path}")
         transferred_paths.append(final_path)
+        op_counts[op] = op_counts.get(op, 0) + 1
     else:
         zero_pad_width = max(len(str(len(source_files))), 2)
         files_with_parts = assign_part_numbers(source_files, zero_pad_width)
@@ -366,8 +408,8 @@ def transfer_directory_to_library(
         for source_file, part_number in files_with_parts:
             ext = source_file.suffix.lstrip(".")
             file_metadata = {**metadata, "PartNumber": part_number}
-            file_path = build_library_path(library_base, template, file_metadata, extension=ext)
-            file_path.parent.mkdir(parents=True, exist_ok=True)
+            file_path = run_blocking_io(build_library_path, library_base, template, file_metadata, extension=ext)
+            run_blocking_io(file_path.parent.mkdir, parents=True, exist_ok=True)
 
             final_path, op = _transfer_single_file(
                 source_file,
@@ -378,14 +420,23 @@ def transfer_directory_to_library(
             )
             logger.debug(f"Library {op}: {source_file.name} -> {final_path}")
             transferred_paths.append(final_path)
+            op_counts[op] = op_counts.get(op, 0) + 1
 
-    if use_hardlink:
-        operation = "hardlinks"
-    elif is_torrent:
-        operation = "copies"
-    else:
-        operation = "files"
-    logger.info(f"Created {len(transferred_paths)} library {operation} in {base_library_path.parent}")
+    op_summary = ", ".join(
+        f"{op}={count}" for op, count in op_counts.items() if count
+    ) or "none"
+    logger.info(
+        "Created %d library file(s) in %s (ops: %s)",
+        len(transferred_paths),
+        base_library_path.parent,
+        op_summary,
+    )
+    if use_hardlink and op_counts.get("copy", 0):
+        logger.warning(
+            "Library hardlink requested but %d of %d file(s) copied (fallback)",
+            op_counts.get("copy", 0),
+            len(transferred_paths),
+        )
 
     if use_hardlink and temp_file and not is_torrent_source(temp_file, task):
         safe_cleanup_path(temp_file, task)

shelfmark/download/postprocess/workspace.py

@@ -7,6 +7,7 @@ from typing import List, Optional
 from shelfmark.config import env as env_config
 from shelfmark.core.logger import setup_logger
 from shelfmark.core.models import DownloadTask
+from shelfmark.download.fs import run_blocking_io
 from shelfmark.download.staging import STAGE_NONE
 
 from .types import OutputPlan
@@ -21,8 +22,20 @@ def _tmp_dir() -> Path:
 def is_within_tmp_dir(path: Path) -> bool:
     """Legacy helper: True if path is inside TMP_DIR."""
 
+    # Fast path: avoid `resolve()` (can block on NFS) for obviously-non-TMP paths.
+    # This is a *negative* check only; for potential TMP paths we still resolve to
+    # prevent symlink escapes from being treated as managed.
+    tmp_dir = _tmp_dir()
     try:
-        path.resolve().relative_to(_tmp_dir().resolve())
+        if path.is_absolute() and tmp_dir.is_absolute():
+            if path != tmp_dir and tmp_dir not in path.parents:
+                return False
+    except Exception:
+        # Fall back to the slower resolve-based check below.
+        pass
+
+    try:
+        run_blocking_io(path.resolve).relative_to(run_blocking_io(tmp_dir.resolve))
         return True
     except (OSError, ValueError):
         return False
@@ -42,7 +55,8 @@ def _is_original_download(path: Optional[Path], task: DownloadTask) -> bool:
     if not path or not task.original_download_path:
         return False
     try:
-        return path.resolve() == Path(task.original_download_path).resolve()
+        original = Path(task.original_download_path)
+        return run_blocking_io(path.resolve) == run_blocking_io(original.resolve)
     except (OSError, ValueError):
         return False
 
@@ -59,7 +73,7 @@ def safe_cleanup_path(path: Optional[Path], task: DownloadTask) -> None:
 
     try:
         if path.is_dir():
-            shutil.rmtree(path, ignore_errors=True)
+            run_blocking_io(shutil.rmtree, path, ignore_errors=True)
         elif path.exists():
             path.unlink(missing_ok=True)
     except (OSError, PermissionError) as exc:

shelfmark/download/staging.py

@@ -7,6 +7,7 @@ from typing import Literal
 
 from shelfmark.config import env as env_config
 from shelfmark.core.logger import setup_logger
+from shelfmark.download.fs import run_blocking_io
 
 logger = setup_logger(__name__)
 
@@ -19,7 +20,7 @@ STAGE_MOVE: StageAction = "move"
 def get_staging_dir() -> Path:
     """Get the staging directory for downloads."""
     tmp_dir = env_config.TMP_DIR
-    tmp_dir.mkdir(parents=True, exist_ok=True)
+    run_blocking_io(tmp_dir.mkdir, parents=True, exist_ok=True)
     return tmp_dir
 
 
@@ -40,11 +41,11 @@ def build_staging_dir(prefix: str | None, task_id: str) -> Path:
     staging_dir = base_dir / f"{prefix}_{safe_id}"
     counter = 1
 
-    while staging_dir.exists():
+    while run_blocking_io(staging_dir.exists):
         staging_dir = base_dir / f"{prefix}_{safe_id}_{counter}"
         counter += 1
 
-    staging_dir.mkdir(parents=True, exist_ok=True)
+    run_blocking_io(staging_dir.mkdir, parents=True, exist_ok=True)
     return staging_dir
 
 
@@ -62,23 +63,24 @@ def stage_path(source: Path, staging_dir: Path, action: StageAction) -> Path:
     staged_path = staging_dir / source.name
     counter = 1
 
-    if source.is_dir():
-        while staged_path.exists():
+    source_is_dir = run_blocking_io(source.is_dir)
+    if source_is_dir:
+        while run_blocking_io(staged_path.exists):
             staged_path = staging_dir / f"{source.name}_{counter}"
             counter += 1
         if action == STAGE_COPY:
-            shutil.copytree(str(source), str(staged_path))
+            run_blocking_io(shutil.copytree, str(source), str(staged_path))
         else:
-            shutil.move(str(source), str(staged_path))
+            run_blocking_io(shutil.move, str(source), str(staged_path))
     else:
-        while staged_path.exists():
+        while run_blocking_io(staged_path.exists):
             staged_path = staging_dir / f"{source.stem}_{counter}{source.suffix}"
             counter += 1
         if action == STAGE_COPY:
-            shutil.copy2(str(source), str(staged_path))
+            run_blocking_io(shutil.copy2, str(source), str(staged_path))
         else:
-            shutil.move(str(source), str(staged_path))
+            run_blocking_io(shutil.move, str(source), str(staged_path))
 
-    staged_kind = "directory" if source.is_dir() else "file"
+    staged_kind = "directory" if source_is_dir else "file"
     logger.debug("Staged %s via %s: %s -> %s", staged_kind, action, source, staged_path)
     return staged_path

shelfmark/metadata_providers/__init__.py

@@ -35,6 +35,14 @@ SORT_LABELS: Dict[SortOrder, str] = {
 }
 
 
+@dataclass
+class MetadataCapability:
+    """Declarative provider capability consumed by shared UI code."""
+    key: str
+    field_key: Optional[str] = None
+    sort: Optional[SortOrder] = None
+
+
 @dataclass
 class TextSearchField:
     """Text input search field."""
@@ -42,6 +50,8 @@ class TextSearchField:
     label: str                            # Display label in UI
     placeholder: str = ""                 # Placeholder text
     description: str = ""                 # Help text
+    suggestions_endpoint: Optional[str] = None  # Remote suggestions endpoint for typeahead
+    suggestions_min_query_length: int = 2       # Minimum chars before requesting suggestions
 
 
 @dataclass
@@ -75,8 +85,39 @@ class CheckboxSearchField:
     default: bool = False
 
 
+@dataclass
+class DynamicSelectSearchField:
+    """Single-choice dropdown field with options loaded from an API endpoint."""
+    key: str
+    label: str
+    options_endpoint: str
+    placeholder: str = ""
+    description: str = ""
+
+
 # Type alias for all search field types
-SearchField = Union[TextSearchField, NumberSearchField, SelectSearchField, CheckboxSearchField]
+SearchField = Union[
+    TextSearchField,
+    NumberSearchField,
+    SelectSearchField,
+    CheckboxSearchField,
+    DynamicSelectSearchField,
+]
+
+
+def serialize_metadata_capability(capability: MetadataCapability) -> Dict[str, Any]:
+    """Serialize a provider capability for API responses."""
+    result: Dict[str, Any] = {
+        "key": capability.key,
+    }
+
+    if capability.field_key:
+        result["field_key"] = capability.field_key
+
+    if capability.sort:
+        result["sort"] = capability.sort.value
+
+    return result
 
 
 def serialize_search_field(search_field: SearchField) -> Dict[str, Any]:
@@ -94,10 +135,16 @@ def serialize_search_field(search_field: SearchField) -> Dict[str, Any]:
         result["min"] = search_field.min_value
         result["max"] = search_field.max_value
         result["step"] = search_field.step
+    elif isinstance(search_field, TextSearchField):
+        if search_field.suggestions_endpoint:
+            result["suggestions_endpoint"] = search_field.suggestions_endpoint
+            result["suggestions_min_query_length"] = search_field.suggestions_min_query_length
     elif isinstance(search_field, SelectSearchField):
         result["options"] = search_field.options
     elif isinstance(search_field, CheckboxSearchField):
         result["default"] = search_field.default
+    elif isinstance(search_field, DynamicSelectSearchField):
+        result["options_endpoint"] = search_field.options_endpoint
 
     return result
 
@@ -151,6 +198,7 @@ class BookMetadata:
     display_fields: List[DisplayField] = field(default_factory=list)
 
     # Series info (if book is part of a series)
+    series_id: Optional[str] = None        # Provider-specific series ID
     series_name: Optional[str] = None      # Name of the series
     series_position: Optional[float] = None  # This book's position (e.g., 3, 1.5 for novellas)
     series_count: Optional[int] = None     # Total books in the series
@@ -262,6 +310,8 @@ class SearchResult:
     page: int = 1
     total_found: int = 0  # Total matching results (if known)
     has_more: bool = False  # True if more results available
+    source_url: Optional[str] = None  # External URL for the result set (e.g. Hardcover list page)
+    source_title: Optional[str] = None  # Display title for the result set (e.g. list name)
 
 
 class MetadataProvider(ABC):
@@ -276,12 +326,14 @@ class MetadataProvider(ABC):
         requires_auth: True if API key/authentication is required
         supported_sorts: List of SortOrder values this provider supports
         search_fields: List of provider-specific search fields
+        capabilities: Declarative capabilities exposed to shared UI code
     """
     name: str
     display_name: str
     requires_auth: bool
     supported_sorts: List[SortOrder] = [SortOrder.RELEVANCE]
     search_fields: List[SearchField] = []
+    capabilities: List[MetadataCapability] = []
 
     @abstractmethod
     def search(self, options: MetadataSearchOptions) -> List[BookMetadata]:
@@ -315,6 +367,44 @@ class MetadataProvider(ABC):
             has_more=has_more
         )
 
+    def get_search_field_options(
+        self,
+        field_key: str,
+        query: Optional[str] = None,
+    ) -> List[Dict[str, str]]:
+        """Get dynamic options for a provider-specific search field."""
+        return []
+
+    def get_book_targets(self, book_id: str) -> List[Dict[str, Any]]:
+        """Get provider-managed list or status targets for a specific book."""
+        raise NotImplementedError(f"{self.display_name} does not support book targets")
+
+    def get_book_targets_batch(self, book_ids: List[str]) -> Dict[str, List[Dict[str, Any]]]:
+        """Get provider-managed targets for multiple books.
+
+        Returns a dict mapping each book_id to its list of target options.
+        Default implementation calls get_book_targets per book.
+        """
+        results: Dict[str, List[Dict[str, Any]]] = {}
+        for book_id in book_ids:
+            try:
+                results[book_id] = self.get_book_targets(book_id)
+            except (NotImplementedError, ValueError):
+                results[book_id] = []
+        return results
+
+    def set_book_target_state(
+        self,
+        book_id: str,
+        target: str,
+        selected: bool,
+    ) -> Dict[str, Any]:
+        """Set whether a book belongs to a provider-managed list or shelf.
+
+        Returns a dict with at least ``{"changed": bool}``.
+        """
+        raise NotImplementedError(f"{self.display_name} does not support book targets")
+
 
 # Provider registry
 _PROVIDERS: Dict[str, Type[MetadataProvider]] = {}
@@ -393,7 +483,10 @@ def get_enabled_providers() -> List[str]:
     return [name for name in _PROVIDERS if is_provider_enabled(name)]
 
 
-def get_configured_provider(content_type: str = "ebook") -> Optional[MetadataProvider]:
+def get_configured_provider(
+    content_type: str = "ebook",
+    user_id: Optional[int] = None,
+) -> Optional[MetadataProvider]:
     """Get the currently configured metadata provider for the content type."""
     from shelfmark.core.config import config as app_config
 
@@ -402,11 +495,11 @@ def get_configured_provider(content_type: str = "ebook") -> Optional[MetadataPro
 
     # For audiobooks, try audiobook-specific provider first, then fall back to main provider
     if content_type == "audiobook":
-        metadata_provider = app_config.get("METADATA_PROVIDER_AUDIOBOOK", "")
+        metadata_provider = app_config.get("METADATA_PROVIDER_AUDIOBOOK", "", user_id=user_id)
         if not metadata_provider:
-            metadata_provider = app_config.get("METADATA_PROVIDER", "")
+            metadata_provider = app_config.get("METADATA_PROVIDER", "", user_id=user_id)
     else:
-        metadata_provider = app_config.get("METADATA_PROVIDER", "")
+        metadata_provider = app_config.get("METADATA_PROVIDER", "", user_id=user_id)
 
     if not metadata_provider:
         return None
@@ -422,17 +515,35 @@ def get_configured_provider(content_type: str = "ebook") -> Optional[MetadataPro
     return get_provider(metadata_provider, **kwargs)
 
 
-def _get_configured_provider_name() -> str:
-    """Get the currently configured metadata provider name from config."""
+def get_configured_provider_name(
+    content_type: str = "ebook",
+    user_id: Optional[int] = None,
+    fallback_to_main: bool = True,
+) -> str:
+    """Get the configured metadata provider name for a content type."""
     from shelfmark.core.config import config as app_config
+
     app_config.refresh()
-    return app_config.get("METADATA_PROVIDER", "")
+
+    if content_type == "audiobook":
+        audiobook_provider = app_config.get(
+            "METADATA_PROVIDER_AUDIOBOOK",
+            "",
+            user_id=user_id,
+        )
+        if audiobook_provider or not fallback_to_main:
+            return audiobook_provider
+
+    return app_config.get("METADATA_PROVIDER", "", user_id=user_id)
 
 
-def get_provider_sort_options(provider_name: Optional[str] = None) -> List[Dict[str, str]]:
+def get_provider_sort_options(
+    provider_name: Optional[str] = None,
+    user_id: Optional[int] = None,
+) -> List[Dict[str, str]]:
     """Get sort options for a metadata provider as {value, label} dicts."""
     if provider_name is None:
-        provider_name = _get_configured_provider_name()
+        provider_name = get_configured_provider_name(user_id=user_id)
 
     if provider_name and provider_name in _PROVIDERS:
         provider_class = _PROVIDERS[provider_name]
@@ -446,10 +557,13 @@ def get_provider_sort_options(provider_name: Optional[str] = None) -> List[Dict[
     ]
 
 
-def get_provider_search_fields(provider_name: Optional[str] = None) -> List[Dict[str, Any]]:
+def get_provider_search_fields(
+    provider_name: Optional[str] = None,
+    user_id: Optional[int] = None,
+) -> List[Dict[str, Any]]:
     """Get search fields for a metadata provider as serialized dicts."""
     if provider_name is None:
-        provider_name = _get_configured_provider_name()
+        provider_name = get_configured_provider_name(user_id=user_id)
 
     if provider_name and provider_name in _PROVIDERS:
         provider_class = _PROVIDERS[provider_name]
@@ -460,19 +574,39 @@ def get_provider_search_fields(provider_name: Optional[str] = None) -> List[Dict
     return [serialize_search_field(f) for f in fields]
 
 
-def get_provider_default_sort(provider_name: Optional[str] = None) -> str:
+def get_provider_capabilities(
+    provider_name: Optional[str] = None,
+    user_id: Optional[int] = None,
+) -> List[Dict[str, Any]]:
+    """Get declarative capabilities for a metadata provider."""
+    if provider_name is None:
+        provider_name = get_configured_provider_name(user_id=user_id)
+
+    if provider_name and provider_name in _PROVIDERS:
+        provider_class = _PROVIDERS[provider_name]
+        capabilities = getattr(provider_class, "capabilities", [])
+    else:
+        capabilities = []
+
+    return [serialize_metadata_capability(capability) for capability in capabilities]
+
+
+def get_provider_default_sort(
+    provider_name: Optional[str] = None,
+    user_id: Optional[int] = None,
+) -> str:
     """Get the default sort order for a metadata provider."""
     from shelfmark.core.config import config as app_config
 
     if provider_name is None:
-        provider_name = _get_configured_provider_name()
+        provider_name = get_configured_provider_name(user_id=user_id)
 
     if not provider_name:
         return "relevance"
 
     # Look up provider-specific default sort setting
     setting_key = f"{provider_name.upper()}_DEFAULT_SORT"
-    return app_config.get(setting_key, "relevance")
+    return app_config.get(setting_key, "relevance", user_id=user_id)
 
 
 def sync_metadata_provider_selection() -> None:
@@ -502,7 +636,7 @@ def sync_metadata_provider_selection() -> None:
         general_config = load_config_file("general")
         general_config["METADATA_PROVIDER"] = new_provider
         save_config_file("general", general_config)
-        app_config.refresh()
+        app_config.refresh(force=True)
 
 
 # Import provider implementations to trigger registration

shelfmark/metadata_providers/googlebooks.py

@@ -20,6 +20,7 @@ from shelfmark.core.settings_registry import (
     HeadingField,
 )
 from shelfmark.core.config import config as app_config
+from shelfmark.download.network import get_ssl_verify
 from shelfmark.metadata_providers import (
     BookMetadata,
     DisplayField,
@@ -233,7 +234,7 @@ class GoogleBooksProvider(MetadataProvider):
         url = f"{GOOGLE_BOOKS_BASE_URL}{endpoint}"
 
         try:
-            response = self.session.get(url, params=params, timeout=15)
+            response = self.session.get(url, params=params, timeout=15, verify=get_ssl_verify(url))
             response.raise_for_status()
             return response.json()