Enable multilingual search (#5)

book_manager.py

@@ -28,8 +28,8 @@ def search_books(query: str) -> List[BookInfo]:
     query_html = quote(query)
     url = (
         f"https://annas-archive.org/search?index=&page=1&display=table"
-        f"&acc=aa_download&acc=external_download&lang={BOOK_LANGUAGE}&sort="
-        f"&ext={'&ext='.join(SUPPORTED_FORMATS)}&lang={BOOK_LANGUAGE}&q={query_html}"
+        f"&acc=aa_download&acc=external_download&sort="
+        f"&ext={'&ext='.join(SUPPORTED_FORMATS)}&lang={'&lang='.join(BOOK_LANGUAGE)}&q={query_html}"
     )
     
     html = network.html_get_page(url)
@@ -266,4 +266,4 @@ def _get_download_url(link: str, title: str) -> Optional[str]:
         else:
             return download_links[0]['href']
             
-    return None
+    return None

config.py

@@ -3,6 +3,8 @@
 import os
 from pathlib import Path
 
+_SUPPORTED_BOOK_LANGUAGE = ['en','zh','ru','es','fr','de','it','pt','pl','bg','nl','ja','ar','he','hu','la','cs','ko','tr','uk','id','ro','el','lt','bn','zh‑Hant','af','ca','sv','th','hi','ga','lv','kn','sr','bo','da','fa','hr','sk','jv','vi','ur','fi','no','rw','ta','be','kk','mn','ka','sl','eo','gl','mr','fil','gu','ml','ky','qu','az','sw','ba','pa','ms','te','sq','ug','hy','shn']
+
 # Directory settings
 BASE_DIR = Path(__file__).resolve().parent
 LOG_DIR =  "/var/logs"
@@ -30,6 +32,10 @@ SUPPORTED_FORMATS = os.getenv("SUPPORTED_FORMATS", "epub,mobi,azw3,fb2,djvu,cbz,
 SUPPORTED_FORMATS = SUPPORTED_FORMATS.split(",")
 
 BOOK_LANGUAGE = os.getenv("BOOK_LANGUAGE", "en")
+BOOK_LANGUAGE = BOOK_LANGUAGE.lower().split(',')
+BOOK_LANGUAGE = [l for l in BOOK_LANGUAGE if l in _SUPPORTED_BOOK_LANGUAGE]
+if len(BOOK_LANGUAGE) == 0:
+    BOOK_LANGUAGE = ['en']
 
 # API settings
 FLASK_HOST = os.getenv("FLASK_HOST",  "0.0.0.0")