feat(matrix_chat): remove upload of room avatar

The previous implementation specified the room avatar via an https-URL
(pointing to the media published by grouprise).
But the most commonly used Matrix client (element) uses only "mxc://"
URLs.  These are based on file uploads to the Matrix server.
It would be rather hard to synchronize avatars due to this storage
layer, since we cannot determine, whether an avatar needs an update or
not.

Thus we do not support the synchronization of avatar images between the
grouprise group and the corresponding Matrix rooms for now.

grouprise/features/matrix_chat/matrix_bot.py

@@ -69,34 +69,7 @@ async def synchronize_rooms_of_group(self, group):
             except MatrixError as exc:
                 logger.error(f"Failed to synchronize room: {exc}")
                 continue
-            avatar_changed = False
-            if group.avatar:
-                grouprise_avatar_url = full_url(group.avatar_64.url)
-                response = await self.client.room_get_state_event(
-                    room.room_id, "m.room.avatar"
-                )
-                if isinstance(response, nio.responses.RoomGetStateEventResponse):
-                    current_matrix_avatar_url = response.content.get("url")
-                elif isinstance(response, nio.responses.RoomGetStateEventError) and (
-                    response.status_code == "M_NOT_FOUND"
-                ):
-                    current_matrix_avatar_url = None
-                else:
-                    logger.warning(
-                        f"Failed to retrieve current avatar of group '{group}': {response}"
-                    )
-                    continue
-                if current_matrix_avatar_url != grouprise_avatar_url:
-                    response = await self.client.room_put_state(
-                        room.room_id, "m.room.avatar", {"url": grouprise_avatar_url}
-                    )
-                    if isinstance(response, nio.responses.RoomPutStateResponse):
-                        avatar_changed = True
-                    else:
-                        logger.warning(
-                            f"Failed to update avatar for room '{room}': {response}"
-                        )
-            if created or avatar_changed:
+            if created:
                 yield room
 
     async def _get_or_create_room(self, group, is_private):

grouprise/features/matrix_chat/signals.py

@@ -17,9 +17,10 @@
 
 
 @receiver(post_save, sender=grouprise.features.groups.models.Group)
-@db_task()
-def update_matrix_rooms_for_group(sender, instance, created, update_fields, **kwargs):
-    if created or (update_fields and "logo" in update_fields):
+def update_matrix_rooms_for_group(sender, instance, created, **kwargs):
+    if created:
+        _sync_rooms_delayed(instance)
+
 
 @db_task()
 def _sync_rooms_delayed(group):