[misskey] add my favorites extractor

[03AaN]

This will saves images from favorites. Saving favorites requires access token with "View your list of favorites" permission.

[enduser420]

diff --git a/gallery_dl/extractor/misskey.py b/gallery_dl/extractor/misskey.py
index 7e5ef799..26b7f194 100644
--- a/gallery_dl/extractor/misskey.py
+++ b/gallery_dl/extractor/misskey.py
@@ -27,6 +27,8 @@ class MisskeyExtractor(BaseExtractor):
 
     def items(self):
         for note in self.notes():
+            if "note" in note:
+                note = note["note"]
             files = note.pop("files") or []
             renote = note.get("renote")
             if renote:
@@ -157,26 +159,12 @@ class MisskeyMyFavoritesExtractor(MisskeyExtractor):
     subcategory = "favorites"
     pattern = BASE_PATTERN + r"(/my/favorites|/api/i/favorites)"
     test = (
-        ("https://misskey.io/my/favorites",),
-        ("https://misskey.io/api/i/favorites",),
+        ("https://misskey.io/my/favorites"),
+        ("https://misskey.io/api/i/favorites"),
     )
 
-    def items(self):
-        for fav in self.api.i_favorites():
-            note = fav.get("note")
-            note["instance"] = self.instance
-            note["instance_remote"] = note["user"]["host"]
-            note["count"] = len(note["files"])
-            note["date"] = text.parse_datetime(
-                note["createdAt"], "%Y-%m-%dT%H:%M:%S.%f%z")
-
-            yield Message.Directory, note
-            for note["num"], file in enumerate(note["files"], 1):
-                file["date"] = text.parse_datetime(
-                    file["createdAt"], "%Y-%m-%dT%H:%M:%S.%f%z")
-                note["file"] = file
-                url = file["url"]
-                yield Message.Url, url, text.nameext_from_url(url, note)
+    def notes(self):
+        return self.api.i_favorites()
 
 
 class MisskeyAPI():
@@ -217,10 +205,9 @@ class MisskeyAPI():
 
     def i_favorites(self):
         endpoint = "/i/favorites"
-        data = {}
         if not self.access_token:
             raise exception.AuthenticationError()
-        data["i"] = self.access_token
+        data = {"i": self.access_token}
         return self._pagination(endpoint, data)
 
     def _call(self, endpoint, data):