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-rw-r--r--synapse/rest/client/v1/room.py14
1 files changed, 11 insertions, 3 deletions
diff --git a/synapse/rest/client/v1/room.py b/synapse/rest/client/v1/room.py
index 6fe1eddcce..4b2344e696 100644
--- a/synapse/rest/client/v1/room.py
+++ b/synapse/rest/client/v1/room.py
@@ -568,14 +568,22 @@ class RoomEventServlet(RestServlet):
     @defer.inlineCallbacks
     def on_GET(self, request, room_id, event_id):
         requester = yield self.auth.get_user_by_req(request, allow_guest=True)
-        event = yield self.event_handler.get_event(requester.user, room_id, event_id)
+        try:
+            event = yield self.event_handler.get_event(
+                requester.user, room_id, event_id
+            )
+        except AuthError:
+            # This endpoint is supposed to return a 404 when the requester does
+            # not have permission to access the event
+            # https://matrix.org/docs/spec/client_server/r0.5.0#get-matrix-client-r0-rooms-roomid-event-eventid
+            raise SynapseError(404, "Event not found.", errcode=Codes.NOT_FOUND)
 
         time_now = self.clock.time_msec()
         if event:
             event = yield self._event_serializer.serialize_event(event, time_now)
             return (200, event)
-        else:
-            return (404, "Event not found.")
+
+        return SynapseError(404, "Event not found.", errcode=Codes.NOT_FOUND)
 
 
 class RoomEventContextServlet(RestServlet):