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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 c0d9c08367..b3f979b246 100644
--- a/synapse/handlers/room_member.py
+++ b/synapse/handlers/room_member.py
@@ -374,6 +374,11 @@ class RoomMemberHandler(BaseHandler):
                     # so don't really fit into the general auth process.
                     raise AuthError(403, "Guest access not allowed")
 
+        if event.membership not in (Membership.LEAVE, Membership.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")
+
         yield message_handler.handle_new_client_event(
             requester,
             event,