Merge pull request #6015 from matrix-org/erikj/ratelimit_admin_redaction

1 files changed, 21 insertions, 1 deletions

diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index 291eb9cb15..f158700c15 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -729,7 +729,27 @@ class EventCreationHandler(object):
         assert not self.config.worker_app
 
         if ratelimit:
-            yield self.base_handler.ratelimit(requester)
+            # We check if this is a room admin redacting an event so that we
+            # can apply different ratelimiting. We do this by simply checking
+            # it's not a self-redaction (to avoid having to look up whether the
+            # user is actually admin or not).
+            is_admin_redaction = False
+            if event.type == EventTypes.Redaction:
+                original_event = yield self.store.get_event(
+                    event.redacts,
+                    check_redacted=False,
+                    get_prev_content=False,
+                    allow_rejected=False,
+                    allow_none=True,
+                )
+
+                is_admin_redaction = (
+                    original_event and event.sender != original_event.sender
+                )
+
+            yield self.base_handler.ratelimit(
+                requester, is_admin_redaction=is_admin_redaction
+            )
 
         yield self.base_handler.maybe_kick_guest_users(event, context)