Reject history insertion during partial joins (#14291)

matrix-org · Oct 27, 2022 · cbe01cc · cbe01cc
1 parent 40fa829
commit cbe01cc
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diff --git a/changelog.d/14291.bugfix b/changelog.d/14291.bugfix
@@ -0,0 +1 @@
+Prevent history insertion ([MSC2716](https://github.com/matrix-org/matrix-spec-proposals/pull/2716)) during an partial join ([MSC3706](https://github.com/matrix-org/matrix-spec-proposals/pull/3706)).
diff --git a/synapse/rest/client/room_batch.py b/synapse/rest/client/room_batch.py
@@ -108,6 +108,13 @@ async def on_POST(
                 errcode=Codes.MISSING_PARAM,
             )
 
+        if await self.store.is_partial_state_room(room_id):
+            raise SynapseError(
+                HTTPStatus.BAD_REQUEST,
+                "Cannot insert history batches until we have fully joined the room",
+                errcode=Codes.UNABLE_DUE_TO_PARTIAL_STATE,
+            )
+
         # Verify the batch_id_from_query corresponds to an actual insertion event
         # and have the batch connected.
         if batch_id_from_query: