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-rw-r--r--synapse/config/server_notices.py2
-rw-r--r--synapse/server_notices/server_notices_manager.py15
2 files changed, 16 insertions, 1 deletions
diff --git a/synapse/config/server_notices.py b/synapse/config/server_notices.py
index ce041abe9b..a8badba0f8 100644
--- a/synapse/config/server_notices.py
+++ b/synapse/config/server_notices.py
@@ -48,6 +48,7 @@ class ServerNoticesConfig(Config):
         self.server_notices_mxid_display_name: Optional[str] = None
         self.server_notices_mxid_avatar_url: Optional[str] = None
         self.server_notices_room_name: Optional[str] = None
+        self.server_notices_auto_join: bool = False
 
     def read_config(self, config: JsonDict, **kwargs: Any) -> None:
         c = config.get("server_notices")
@@ -62,3 +63,4 @@ class ServerNoticesConfig(Config):
         self.server_notices_mxid_avatar_url = c.get("system_mxid_avatar_url", None)
         # todo: i18n
         self.server_notices_room_name = c.get("room_name", "Server Notices")
+        self.server_notices_auto_join = c.get("auto_join", False)
diff --git a/synapse/server_notices/server_notices_manager.py b/synapse/server_notices/server_notices_manager.py
index 44b999677a..2353b5d47f 100644
--- a/synapse/server_notices/server_notices_manager.py
+++ b/synapse/server_notices/server_notices_manager.py
@@ -224,14 +224,27 @@ class ServerNoticesManager:
             if room.room_id == room_id:
                 return
 
+        user_id_obj = UserID.from_string(user_id)
         await self._room_member_handler.update_membership(
             requester=requester,
-            target=UserID.from_string(user_id),
+            target=user_id_obj,
             room_id=room_id,
             action="invite",
             ratelimit=False,
         )
 
+        if self._config.servernotices.server_notices_auto_join:
+            user_requester = create_requester(
+                user_id, authenticated_entity=self._server_name
+            )
+            await self._room_member_handler.update_membership(
+                requester=user_requester,
+                target=user_id_obj,
+                room_id=room_id,
+                action="join",
+                ratelimit=False,
+            )
+
     async def _update_notice_user_profile_if_changed(
         self,
         requester: Requester,