1 files changed, 17 insertions, 6 deletions
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index 87f671708c..d370b2c302 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -943,14 +943,24 @@ class EventCreationHandler:
else:
prev_event_ids = await self.store.get_prev_events_for_room(builder.room_id)
- # we now ought to have some prev_events (unless it's a create event).
- #
- # do a quick sanity check here, rather than waiting until we've created the
+ # Do a quick sanity check here, rather than waiting until we've created the
# event and then try to auth it (which fails with a somewhat confusing "No
# create event in auth events")
- assert (
- builder.type == EventTypes.Create or len(prev_event_ids) > 0
- ), "Attempting to create an event with no prev_events"
+ room_version_obj = await self.store.get_room_version(builder.room_id)
+ if room_version_obj.msc2716_empty_prev_events:
+ # We allow events with no `prev_events` but it better have some `auth_events`
+ assert (
+ builder.type == EventTypes.Create
+ or len(prev_event_ids) > 0
+ # Allow an event to have empty list of prev_event_ids
+ # only if it has auth_event_ids.
+ or (auth_event_ids and len(auth_event_ids) > 0)
+ ), "Attempting to create an event with no prev_events or auth_event_ids"
+ else:
+ # we now ought to have some prev_events (unless it's a create event).
+ assert (
+ builder.type == EventTypes.Create or len(prev_event_ids) > 0
+ ), "Attempting to create an event with no prev_events"
event = await builder.build(
prev_event_ids=prev_event_ids,
@@ -1540,6 +1550,7 @@ class EventCreationHandler:
next_batch_id = event.content.get(
EventContentFields.MSC2716_NEXT_BATCH_ID
)
+
conflicting_insertion_event_id = None
if next_batch_id:
conflicting_insertion_event_id = (
|
