Limit the size of the aggregation_key (#12101)

There's no reason to let people use long keys.

1 files changed, 3 insertions, 0 deletions

diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py

index 61cb133ef2..0799ec9a84 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -1069,6 +1069,9 @@ class EventCreationHandler:
         if relation_type == RelationTypes.ANNOTATION:
             aggregation_key = relation["key"]
 
+            if len(aggregation_key) > 500:
+                raise SynapseError(400, "Aggregation key is too long")
+
             already_exists = await self.store.has_user_annotated_event(
                 relates_to, event.type, aggregation_key, event.sender
             )