Check support room has only two users before sending a notice (#8728)

* Check support room has only two users * Create 8728.bugfix * Update synapse/server_notices/server_notices_manager.py Co-authored-by: Erik Johnston <erik@matrix.org> Co-authored-by: Erik Johnston <erik@matrix.org>
matrix-org · Nov 11, 2020 · 89700df · 89700df
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diff --git a/changelog.d/8728.bugfix b/changelog.d/8728.bugfix
@@ -0,0 +1 @@
+Fix bug where the `/_synapse/admin/v1/send_server_notice` API could send notices to non-notice rooms.
diff --git a/synapse/server_notices/server_notices_manager.py b/synapse/server_notices/server_notices_manager.py
@@ -119,7 +119,7 @@ async def get_or_create_notice_room_for_user(self, user_id: str) -> str:
             # manages to invite the system user to a room, that doesn't make it
             # the server notices room.
             user_ids = await self._store.get_users_in_room(room.room_id)
-            if self.server_notices_mxid in user_ids:
+            if len(user_ids) <= 2 and self.server_notices_mxid in user_ids:
                 # we found a room which our user shares with the system notice
                 # user
                 logger.info(