[furaffinity] Add 'thumbnail' (#1284) and 'folders' properties

Retrieve 'thumbnail' and 'folders' properties for each post.
'thumbnail' (#1284):
 - Preview image used for search results, writing posts, music, etc.
 - Filename format: <post_id>@600-<directory_containing_full_image>.jpg
'Folders' (related to #1817):
 - A list of all gallery folders containing this post
 - Folder name format: [<folder_category> - ]<folder_name>
 - Only works on new layout; old layout does not show folders, so list will be empty

A test is included for each property.

gallery_dl/extractor/furaffinity.py

@@ -113,6 +113,9 @@ class FuraffinityExtractor(Extractor):
             data["gender"] = rh(extr('>Gender</strong>', '</div>'))
             data["width"] = pi(extr("<span>", "x"))
             data["height"] = pi(extr("", "p"))
+            data["folders"] = [rh(folder) for folder in extr(
+                '<h3>Listed in Folders</h3>',
+                '</section>').split('</a>') if rh(folder) != '']
         else:
             # old site layout
             data["title"] = text.unescape(extr("<h2>", "</h2>"))
@@ -132,11 +135,16 @@ class FuraffinityExtractor(Extractor):
             data["_description"] = extr(
                 '<td valign="top" align="left" width="70%" class="alt1" '
                 'style="padding:8px">', '                               </td>')
+            data["folders"] = []  # folders not present in old layout
 
         data["artist_url"] = data["artist"].replace("_", "").lower()
         data["user"] = self.user or data["artist_url"]
         data["date"] = text.parse_timestamp(data["filename"].partition(".")[0])
         data["description"] = self._process_description(data["_description"])
+        data["thumbnail"] = (
+            'https://t.furaffinity.net/' +
+            str(data['id']) + '@600-' +
+            data['url'].split('/')[-2].split('.')[0] + '.jpg')
 
         return data
 

test/results/furaffinity.py

@@ -115,6 +115,50 @@ __tests__ = (
     "width"      : 1280,
 },
 
+{
+    "#url"     : "https://www.furaffinity.net/view/22964019/",
+    "#comment" : "get thumbnails for posts (#1284)",
+    "#category": ("", "furaffinity", "post"),
+    "#class"   : furaffinity.FuraffinityPostExtractor,
+
+    "artist"      : "Dwale",
+    "artist_url"  : "dwale",
+    "date"        : "dt:2017-03-21 14:21:29",
+    "fa_category" : "Poetry",
+    "filename"    : "1490106089.dwale_poem_for_children",
+    "folders"     : [],
+    "height"      : 50,
+    "id"          : 22964019,
+    "rating"      : "General",
+    "title"       : "Poem for Children Wishing to Summon Evil Spirits",
+    "thumbnail"   : "https://t.furaffinity.net/22964019@600-1490106089.jpg",
+    "width"       : 50,
+},
+
+{
+    "#url"     : "https://www.furaffinity.net/view/34260156/",
+    "#comment" : "list gallery folders for image",
+    "#category": ("", "furaffinity", "post"),
+    "#class"   : furaffinity.FuraffinityPostExtractor,
+
+    "artist"      : "dbd",
+    "artist_url"  : "dbd",
+    "date"        : "dt:2019-12-17 22:52:01",
+    "fa_category" : "All",
+    "filename"    : "1576623121.dbd_patreoncustom-wdg13-web",
+    "folders"     : ["By Year - 2019",
+                     "Custom Character Folder - All Custom Characters",
+                     "Custom Character Folder - Other Ungulates",
+                     "Custom Character Folder - Female",
+                     "Custom Character Folder - Patreon Supported Custom Characters"],
+    "height"      : 900,
+    "id"          : 34260156,
+    "rating"      : "General",
+    "title"       : "Patreon Custom Deer",
+    "thumbnail"   : "https://t.furaffinity.net/34260156@600-1576623121.jpg",
+    "width"       : 488,
+},
+
 {
     "#url"     : "https://furaffinity.net/view/21835115/",
     "#category": ("", "furaffinity", "post"),