[fansly] add initial support (#4401)

- only posts and creator posts work
- 'home' and 'list' extractors do nothing atm
- needs 'authorization' header as 'token' config value
  to access locked content
- needs yt-dlp to download 1080p videos

docs/configuration.rst

@@ -2811,6 +2811,18 @@ Description
     `fanbox.comments <extractor.fanbox.comments_>`__
 
 
+extractor.fansly.token
+----------------------
+Type
+    ``string``
+Example
+    ``"kX7pL9qW3zT2rY8mB5nJ4vC6xF1tA0hD8uE2wG9yR3sQ7iZ4oM5jN6cP8lV0bK2tU9aL1eW"``
+Description
+    ``authorization`` header value
+    used for requests to ``https://apiv3.fansly.com/api``
+    to access locked content.
+
+
 extractor.flickr.access-token & .access-token-secret
 ----------------------------------------------------
 Type

docs/gallery-dl.conf

@@ -328,6 +328,10 @@
             "fee-max" : null,
             "metadata": false
         },
+        "fansly":
+        {
+            "token": ""
+        },
         "flickr":
         {
             "access-token"       : null,

docs/supportedsites.md

@@ -277,6 +277,12 @@ Consider all listed sites to potentially be NSFW.
     <td>Albums, Avatars, User Profile Information, Photos, Profile Photos, Sets, User Profiles, Videos</td>
     <td><a href="https://github.com/mikf/gallery-dl#cookies">Cookies</a></td>
 </tr>
+<tr id="fansly" title="fansly">
+    <td>Fansly</td>
+    <td>https://fansly.com/</td>
+    <td>Creator-posts, Home Feed, Lists, Posts</td>
+    <td></td>
+</tr>
 <tr id="fantia" title="fantia">
     <td>Fantia</td>
     <td>https://fantia.jp/</td>