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-rw-r--r--synapse/handlers/event_auth.py10
1 files changed, 9 insertions, 1 deletions
diff --git a/synapse/handlers/event_auth.py b/synapse/handlers/event_auth.py
index d441ebb0ab..6bed464351 100644
--- a/synapse/handlers/event_auth.py
+++ b/synapse/handlers/event_auth.py
@@ -241,7 +241,15 @@ class EventAuthHandler:
 
         # If the join rule is not restricted, this doesn't apply.
         join_rules_event = await self._store.get_event(join_rules_event_id)
-        return join_rules_event.content.get("join_rule") == JoinRules.RESTRICTED
+        content_join_rule = join_rules_event.content.get("join_rule")
+        if content_join_rule == JoinRules.RESTRICTED:
+            return True
+
+        # also check for MSC3787 behaviour
+        if room_version.msc3787_knock_restricted_join_rule:
+            return content_join_rule == JoinRules.KNOCK_RESTRICTED
+
+        return False
 
     async def get_rooms_that_allow_join(
         self, state_ids: StateMap[str]