Move some event auth checks out to a different method (#13065)

* Add auth events to events used in tests

* Move some event auth checks out to a different method

Some of the event auth checks apply to an event's auth_events, rather than the
state at the event - which means they can play no part in state
resolution. Move them out to a separate method.

* Rename check_auth_rules_for_event

Now it only checks the state-dependent auth rules, it needs a better name.

1 files changed, 6 insertions, 2 deletions

diff --git a/synapse/handlers/event_auth.py b/synapse/handlers/event_auth.py
index ed4149bd58..a2dd9c7efa 100644
--- a/synapse/handlers/event_auth.py
+++ b/synapse/handlers/event_auth.py
@@ -23,7 +23,10 @@ from synapse.api.constants import (
 )
 from synapse.api.errors import AuthError, Codes, SynapseError
 from synapse.api.room_versions import RoomVersion
-from synapse.event_auth import check_auth_rules_for_event
+from synapse.event_auth import (
+    check_state_dependent_auth_rules,
+    check_state_independent_auth_rules,
+)
 from synapse.events import EventBase
 from synapse.events.builder import EventBuilder
 from synapse.events.snapshot import EventContext
@@ -52,9 +55,10 @@ class EventAuthHandler:
         context: EventContext,
     ) -> None:
         """Check an event passes the auth rules at its own auth events"""
+        await check_state_independent_auth_rules(self._store, event)
         auth_event_ids = event.auth_event_ids()
         auth_events_by_id = await self._store.get_events(auth_event_ids)
-        check_auth_rules_for_event(event, auth_events_by_id.values())
+        check_state_dependent_auth_rules(event, auth_events_by_id.values())
 
     def compute_auth_events(
         self,