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-rw-r--r--changelog.d/4530.bugfix1
-rw-r--r--synapse/handlers/room.py16
2 files changed, 17 insertions, 0 deletions
diff --git a/changelog.d/4530.bugfix b/changelog.d/4530.bugfix
new file mode 100644
index 0000000000..d010af927e
--- /dev/null
+++ b/changelog.d/4530.bugfix
@@ -0,0 +1 @@
+Copy over room federation ability on room upgrade.
\ No newline at end of file
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index 13ba9291b0..a69441b96f 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -263,6 +263,22 @@ class RoomCreationHandler(BaseHandler):
             }
         }
 
+        # Check if old room was non-federatable
+
+        # Get old room's create event
+        old_room_create_event_ids = yield self.store.get_filtered_current_state_ids(
+            old_room_id, StateFilter.from_types(((EventTypes.Create, ""),)),
+        )
+        old_room_create_event_dict = yield self.store.get_events(
+            old_room_create_event_ids.values(),
+        )
+        old_room_create_event = list(old_room_create_event_dict.values())[0]
+
+        # Check if the create event specified a non-federatable room
+        if not old_room_create_event.content.get("m.federate", True):
+            # If so, mark the new room as non-federatable as well
+            creation_content["m.federate"] = False
+
         initial_state = dict()
 
         # Replicate relevant room events