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-rw-r--r--synapse/handlers/room_member.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/synapse/handlers/room_member.py b/synapse/handlers/room_member.py
index 1ca88517a2..c0d9c08367 100644
--- a/synapse/handlers/room_member.py
+++ b/synapse/handlers/room_member.py
@@ -203,6 +203,11 @@ class RoomMemberHandler(BaseHandler):
         if not remote_room_hosts:
             remote_room_hosts = []
 
+        if effective_membership_state not in ("leave", "ban",):
+            is_blocked = yield self.store.is_room_blocked(room_id)
+            if is_blocked:
+                raise SynapseError(403, "This room has been blocked on this server")
+
         latest_event_ids = yield self.store.get_latest_event_ids_in_room(room_id)
         current_state_ids = yield self.state_handler.get_current_state_ids(
             room_id, latest_event_ids=latest_event_ids,