diff --git a/synapse/rest/client/room.py b/synapse/rest/client/room.py
index 01e5079963..91cb791139 100644
--- a/synapse/rest/client/room.py
+++ b/synapse/rest/client/room.py
@@ -52,6 +52,7 @@ from synapse.http.servlet import (
from synapse.http.site import SynapseRequest
from synapse.logging.context import make_deferred_yieldable, run_in_background
from synapse.logging.opentracing import set_tag
+from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.rest.client._base import client_patterns
from synapse.rest.client.transactions import HttpTransactionCache
from synapse.storage.state import StateFilter
@@ -1029,6 +1030,8 @@ class RoomRedactEventRestServlet(TransactionRestServlet):
super().__init__(hs)
self.event_creation_handler = hs.get_event_creation_handler()
self.auth = hs.get_auth()
+ self._relation_handler = hs.get_relations_handler()
+ self._msc3912_enabled = hs.config.experimental.msc3912_enabled
def register(self, http_server: HttpServer) -> None:
PATTERNS = "/rooms/(?P<room_id>[^/]*)/redact/(?P<event_id>[^/]*)"
@@ -1045,20 +1048,46 @@ class RoomRedactEventRestServlet(TransactionRestServlet):
content = parse_json_object_from_request(request)
try:
- (
- event,
- _,
- ) = await self.event_creation_handler.create_and_send_nonmember_event(
- requester,
- {
- "type": EventTypes.Redaction,
- "content": content,
- "room_id": room_id,
- "sender": requester.user.to_string(),
- "redacts": event_id,
- },
- txn_id=txn_id,
- )
+ with_relations = None
+ if self._msc3912_enabled and "org.matrix.msc3912.with_relations" in content:
+ with_relations = content["org.matrix.msc3912.with_relations"]
+ del content["org.matrix.msc3912.with_relations"]
+
+ # Check if there's an existing event for this transaction now (even though
+ # create_and_send_nonmember_event also does it) because, if there's one,
+ # then we want to skip the call to redact_events_related_to.
+ event = None
+ if txn_id:
+ event = await self.event_creation_handler.get_event_from_transaction(
+ requester, txn_id, room_id
+ )
+
+ if event is None:
+ (
+ event,
+ _,
+ ) = await self.event_creation_handler.create_and_send_nonmember_event(
+ requester,
+ {
+ "type": EventTypes.Redaction,
+ "content": content,
+ "room_id": room_id,
+ "sender": requester.user.to_string(),
+ "redacts": event_id,
+ },
+ txn_id=txn_id,
+ )
+
+ if with_relations:
+ run_as_background_process(
+ "redact_related_events",
+ self._relation_handler.redact_events_related_to,
+ requester=requester,
+ event_id=event_id,
+ initial_redaction_event=event,
+ relation_types=with_relations,
+ )
+
event_id = event.event_id
except ShadowBanError:
event_id = "$" + random_string(43)
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