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-rw-r--r--synapse/handlers/room.py10
1 files changed, 10 insertions, 0 deletions
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index 59e4d1cd15..5f18007e90 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -44,16 +44,19 @@ class RoomCreationHandler(BaseHandler):
             "join_rules": JoinRules.INVITE,
             "history_visibility": "shared",
             "original_invitees_have_ops": False,
+            "guest_can_join": True,
         },
         RoomCreationPreset.TRUSTED_PRIVATE_CHAT: {
             "join_rules": JoinRules.INVITE,
             "history_visibility": "shared",
             "original_invitees_have_ops": True,
+            "guest_can_join": True,
         },
         RoomCreationPreset.PUBLIC_CHAT: {
             "join_rules": JoinRules.PUBLIC,
             "history_visibility": "shared",
             "original_invitees_have_ops": False,
+            "guest_can_join": False,
         },
     }
 
@@ -336,6 +339,13 @@ class RoomCreationHandler(BaseHandler):
                 content={"history_visibility": config["history_visibility"]}
             )
 
+        if config["guest_can_join"]:
+            if (EventTypes.GuestAccess, '') not in initial_state:
+                yield send(
+                    etype=EventTypes.GuestAccess,
+                    content={"guest_access": "can_join"}
+                )
+
         for (etype, state_key), content in initial_state.items():
             yield send(
                 etype=etype,