add support for fetching anidb posters

README.md

@@ -66,6 +66,12 @@ file = File(path="/media/Anime/Series/Kemono no Souja Erin/[winterbird] Kemono n
 # note that most of the time this will work even if we use a file that is not in the anidb database
 # will print "'<path>' contains episode 5 of 'Kemono no Souja Erin'. Mylist state is 'on hdd'"
 print("'{}' contains episode {} of '{}'. Mylist state is '{}'".format(file.path, file.episode.episode_number, file.anime.title, file.mylist_state))
+
+# adbb supports fetching posters. download_image() supports Anime and Group objects
+# (afaik, there are no other images to get from anidb)
+# For other images, check the fanart section below.
+with open('poster.jpg', 'wb') as f:
+    adbb.download_image(f, anime)
 ```
 
 ## Reference 

adbb/__init__.py

@@ -148,6 +148,19 @@ def get_session():
 def close_session(session):
     session.close()
 
+def download_image(filehandle, obj):
+    if type(obj) not in (Anime, Group):
+        raise adbb.errors.AniDBMissingImage(f'Object type {type(obj)} does not support images')
+    if not obj.picname:
+        raise adbb.errors.AniDBMissingImage(f'{obj} does not have a picture defined')
+    url_base = 'https://cdn.anidb.net/images/main'
+    url=f'{url_base}/{obj.picname}'
+    req = urllib.request.Request(url)
+    with urllib.request.urlopen(req) as f:
+        filehandle.write(f.read())
+
+
+
 def download_fanart(filehandle, url, preview=False):
     if not fanart_key:
         raise adbb.errors.FanartError('No fanart key available')

adbb/errors.py

@@ -55,3 +55,6 @@ class IllegalAnimeObject(AniDBError):
 
 class FanartError(AniDBError):
     pass
+
+class AniDBMissingImage(AniDBError):
+    pass

adbb/jellyfin.py

@@ -245,6 +245,16 @@ def write_nfo(obj, nfo_path, fetch_fanart=True, dry_run=False):
                         os.remove(tmpart)
                         continue
                     os.rename(tmpart, os.path.join(art_dir, fname))
+            if not all_arts['poster']:
+                fname = 'poster.jpg'
+                tmpfile = os.path.join(art_dir, f'.{fname}.tmp')
+                try:
+                    with open(tmpfile, 'wb') as f:
+                        adbb.download_image(f, anime)
+                    os.rename(tmpfile, os.path.join(art_dir, fname))
+                except urllib.error.HTTPError as e:
+                    adbb.log.error(f'Failed to download anidb image for {anime}: {e}')
+                    os.remove(tmpfile)
 
     os.rename(tmpfile, nfo_path)
 
@@ -282,8 +292,8 @@ def create_anime_collection(
     os.makedirs(collection_dir, exist_ok=True)
     # Fanart
     all_arts = { k: [] for k in JELLYFIN_ART_TYPES }
-    for anime in relations:
-        for arts in anime.fanart:
+    for series in relations:
+        for arts in series.fanart:
             for key, value in arts.items():
                 if key in FANART_MAP:
                     art_type = FANART_MAP[key]
@@ -306,10 +316,20 @@ def create_anime_collection(
                 with open(tmpfile, 'wb') as f:
                     adbb.download_fanart(f, url)
             except urllib.error.HTTPError as e:
-                adbb.log.error('Failed to download fanart at {url}: {e}')
+                adbb.log.error(f'Failed to download fanart at {url}: {e}')
                 os.remove(tmpfile)
                 continue
             os.rename(tmpfile, os.path.join(collection_dir, fname))
+    if not all_arts['poster']:
+        fname = 'poster.jpg'
+        tmpfile = os.path.join(collection_dir, f'.{fname}.tmp')
+        try:
+            with open(tmpfile, 'wb') as f:
+                adbb.download_image(f, anime)
+            os.rename(tmpfile, os.path.join(collection_dir, fname))
+        except urllib.error.HTTPError as e:
+            adbb.log.error(f'Failed to download anidb image for {anime}: {e}')
+            os.remove(tmpfile)
 
 
     # XML