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Lance Marks f441b85da2 feat(packs): inspect multi-book releases and file each book separately (#1270)
## Multi-book packs: inspect a release before download and file each
book separately

Closes #576

### Problem

One queued release is always treated as one book. When a torrent is
actually a whole series
(`Series/Book 1 - Title/…`, or a flat folder of `Series 1.0 - Title.m4b`
files), post-processing
walks the whole tree, flattens every file into one list and renames them
`Title - 01…10` under the
searched book's `{Author}/{Title}`. Audiobookshelf then sees a single
10-file "book" and the user
has to re-file everything by hand.

### What this does

Most releases expose their file list *before* anything is downloaded, so
the split is decided up
front and approved by the user, then the download is fire-and-forget:

1. **Inspect** – clicking a release's download button now calls `POST
/api/releases/inspect`
first. A new optional `DownloadHandler.list_files(release_data)` hook
returns the release's
   files without downloading:
- **AudiobookBay** reads the torrent file table off the detail page it
already fetches (the
page is now cached for 120 s, so inspect + download cost ABB one
request).
- **Prowlarr** parses `info.files` from the `.torrent` it already
fetches (the existing 120 s
torrent-fetch cache is reused). Magnet-only and usenet releases report
"can't inspect".
   - Other sources default to `None`.
2. **Review** – if the plan contains more than one book, the Find
Releases modal swaps the list
for a review panel: one row per book with editable title / series
position / year, expandable
file lists, non-book sidecars (`.txt`, covers) shown as ignored, a
"Treat as a single book"
switch, and **Download N books**. Single-book releases queue
immediately, exactly as before.
3. **File** – the approved plan travels with the task
(`DownloadTask.book_plan`, retry-safe) and
post-processing files each book through the existing transfer code, one
book at a time
(`dataclasses.replace(task, title=…, series_position=…, year=…)`), so
organize/rename
templates, part numbering (now scoped per book), hardlinks, torrent
copy-preserve and usenet
   handling are unchanged. Status reads `Complete (N books, M files)`.
4. **Fallback** – when a release can't be inspected the user gets a
toast, and a small
"Multi-book pack" toggle in the modal header forces a heuristic split
(subfolder = book, or
   one book per file when the file names carry series positions).

Planning lives in `shelfmark/download/postprocess/packs.py` and is
shared by the inspect endpoint
and post-processing, so what the user approved is what gets filed. The
name parser strips
`Book 3 -`, `03 -`, `1.0 -`, `3.`, `[03]`, `#3`, a leading series name,
labels like
"An Expanse Novella -", repeated titles (`Gods of Risk 2.5 - Gods of
Risk`) and a trailing
`(Year)`; author and series name come from the book that was searched,
and the searched book's
own series position is never applied to its siblings.

### Files

- `shelfmark/download/postprocess/packs.py` (new) –
`PackFile/PackBook/PackPlan`, `plan_pack`,
`parse_pack_book_name`, `group_files_into_books`, `match_plan_to_files`
- `shelfmark/core/release_inspect_routes.py` (new) – `POST
/api/releases/inspect`
- `shelfmark/release_sources/__init__.py` – `DownloadHandler.list_files`
hook
- `shelfmark/release_sources/audiobookbay/{scraper,handler}.py` –
detail-page cache,
  `extract_file_list`, `list_files`
- `shelfmark/release_sources/prowlarr/handler.py`,
`download/clients/torrent_utils.py` –
  `extract_file_list_from_torrent`, `list_files`
- `shelfmark/core/models.py`, `download/orchestrator.py` – `multi_book`
/ `book_plan` fields,
  queue + retry serialization
- `shelfmark/download/postprocess/transfer.py`, `pipeline.py`,
`outputs/folder.py` – per-book
  transfer branch and status message
- `src/frontend`: `components/PackReviewPanel.tsx` (new),
`ReleaseModal.tsx`, `App.tsx`,
`services/api.ts`, `types/index.ts`, `utils/releasePayload.ts` (payload
builder moved out of
  `App.tsx`), `utils/packReview.ts`
- `docs/dev/release-sources-plugin-guide.md` – documents the
`list_files` hook

### Out of scope (follow-ups)

- Listing files from an NZB (Shelfmark already fetches the bytes; `<file
subject>` names are noisy)
- Inspecting magnet links via qBittorrent's files API after a paused add
- BookLore / email outputs (they ignore `book_plan`; noted in code)
- The combined ebook + audiobook flow

### Testing

**Automated** (`make checks`, `make python-test`, `make frontend-test`
all green; the only
failures on my machine are the pre-existing
`tests/config/test_entrypoint_permissions.py` cases,
which need bash ≥ 4 and fail identically on `main` under macOS bash
3.2):

- `tests/download/test_packs.py` – name parsing (markers, series name,
novella labels, repeated
titles, bare numeric titles like `1984`), nested / flat / mixed /
deeper-nested packs, single
wrapping folder not treated as a pack, plan-to-disk matching with
basename fallback
- `tests/core/test_processing_packs.py` – full `post_process_download`
runs on a real temp
filesystem: approved plan files each book under its own
`{Author}/{Title}`, heuristic split
of a nested pack, searched book's series position does not leak,
multi-file book inside a pack
keeps `- 01/- 02` per book, hardlinked torrent pack leaves the seeding
tree intact, no pack
fields ⇒ behaviour unchanged, single group degrades to the searched
title, status message
- `tests/core/test_release_inspect_routes.py` – plan response,
not-inspectable, handler errors
  never 500, unknown source / missing `source_id` ⇒ 400, login required
- `tests/audiobookbay/test_file_list.py` – file-table scraping from real
ABB markup (multi-file
and single-file pages), handler host validation, one page fetch shared
by magnet + file list
- `tests/prowlarr/test_torrent_file_list.py` – multi-file / single-file
`.torrent` parsing,
  handler behaviour for torrent URL vs magnet vs usenet vs cache miss
- `tests/download/test_orchestrator_pack_fields.py` – queue-time parsing
and retry round-trip
- Frontend: `releasePayload.test.ts`, `packReview.test.ts` (vitest)

**Manual, on a real deployment** (arm64 image built from this branch,
run as a side container
next to production with the same qBittorrent / Audiobookshelf setup,
`FILE_ORGANIZATION_AUDIOBOOK=organize`,
hardlinks on):

- AudiobookBay "The Expanse Complete 2.0" (7.87 GB, 36 files): clicking
download opened the review
panel in ~1 s showing **18 books · 18 files · 18 files ignored** (the
`.txt` sidecars), with
series positions 0.1–9.5 and years parsed from the file names; novella
labels stripped
("The Churn", "The Butcher of Anderson Station"). Editing a title in the
panel works.
Confirming queued one task; the magnet resolved from the cached page in
~30 ms; after the
download the task reported `Complete (18 books, 18 files)`, 18 hardlinks
landed as
`audiobooks/James S. A. Corey/<Title>/<Title>.m4b`, the torrent kept
seeding, and
Audiobookshelf scanned each folder as its own book (title, author,
embedded chapters).
- A second pack ("Expanse [01 - 9.5]", `Title N - Title` naming) was
inspected to verify the
  repeated-title rule and the Back button, without downloading.
- Single-book releases still queue immediately with no extra UI.
2026-08-27 00:40:08 -04:00

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