[patreon] use mobile UA (#6241, #6239, #6140)

docs/configuration.rst

@@ -627,7 +627,7 @@ Description
     and use the User-Agent used by the system's default browser.
 
     Note: This option has no effect on
-    `pixiv`, `e621`, and `mangadex`
+    `pixiv`, `e621`, `mangadex`, and `patreon`
     extractors, as these need specific values to function correctly.
 
 
@@ -636,7 +636,7 @@ extractor.*.browser
 Type
     ``string``
 Default
-    * ``"firefox"``: ``artstation``, ``mangasee``, ``patreon``, ``pixiv:series``, ``twitter``
+    * ``"firefox"``: ``artstation``, ``mangasee``, ``twitter``
     * ``null``: otherwise
 Example
     * ``"chrome:macos"``
@@ -712,7 +712,7 @@ extractor.*.tls12
 Type
     ``bool``
 Default
-    * ``false``: ``artstation``, ``patreon``, ``pixiv:series``
+    * ``false``: ``artstation``
     * ``true``: otherwise
 Description
     Allow selecting TLS 1.2 cipher suites.

gallery_dl/extractor/patreon.py

@@ -23,16 +23,17 @@ class PatreonExtractor(Extractor):
     directory_fmt = ("{category}", "{creator[full_name]}")
     filename_fmt = "{id}_{title}_{num:>02}.{extension}"
     archive_fmt = "{id}_{num}"
-    browser = "firefox"
-    tls12 = False
     _warning = True
 
-    def items(self):
+    def _init(self):
+        self.session.headers["User-Agent"] = \
+            "Patreon/72.2.28 (Android; Android 14; Scale/2.10)"
         if self._warning:
             if not self.cookies_check(("session_id",)):
                 self.log.warning("no 'session_id' cookie set")
             PatreonExtractor._warning = False
 
+    def items(self):
         generators = self._build_file_generators(self.config("files"))
 
         for post in self.posts():