Stop returning EventContext from _check_event_auth

We now always return the same object that was passed in, so this is redundant.

synapse/handlers/federation_event.py

@@ -335,7 +335,7 @@ async def on_send_membership_event(
         event.internal_metadata.send_on_behalf_of = origin
 
         context = await self._state_handler.compute_event_context(event)
-        context = await self._check_event_auth(origin, event, context)
+        await self._check_event_auth(origin, event, context)
         if context.rejected:
             raise SynapseError(
                 403, f"{event.membership} event was rejected", Codes.FORBIDDEN
@@ -471,7 +471,7 @@ async def process_remote_join(
                 partial_state=partial_state,
             )
 
-            context = await self._check_event_auth(origin, event, context)
+            await self._check_event_auth(origin, event, context)
             if context.rejected:
                 raise SynapseError(400, "Join event was rejected")
 
@@ -1098,11 +1098,7 @@ async def _process_received_pdu(
                 event,
                 state_ids_before_event=state_ids,
             )
-            context = await self._check_event_auth(
-                origin,
-                event,
-                context,
-            )
+            await self._check_event_auth(origin, event, context)
         except AuthError as e:
             # FIXME richvdh 2021/10/07 I don't think this is reachable. Let's log it
             #   for now
@@ -1478,11 +1474,8 @@ async def prep(event: EventBase) -> None:
         )
 
     async def _check_event_auth(
-        self,
-        origin: str,
-        event: EventBase,
-        context: EventContext,
-    ) -> EventContext:
+        self, origin: str, event: EventBase, context: EventContext
+    ) -> None:
         """
         Checks whether an event should be rejected (for failing auth checks).
 
@@ -1492,9 +1485,6 @@ async def _check_event_auth(
             context:
                 The event context.
 
-        Returns:
-            The updated context object.
-
         Raises:
             AuthError if we were unable to find copies of the event's auth events.
                (Most other failures just cause us to set `context.rejected`.)
@@ -1509,7 +1499,7 @@ async def _check_event_auth(
             logger.warning("While validating received event %r: %s", event, e)
             # TODO: use a different rejected reason here?
             context.rejected = RejectedReason.AUTH_ERROR
-            return context
+            return
 
         # next, check that we have all of the event's auth events.
         #
@@ -1532,7 +1522,7 @@ async def _check_event_auth(
                 "While checking auth of %r against auth_events: %s", event, e
             )
             context.rejected = RejectedReason.AUTH_ERROR
-            return context
+            return
 
         # now check the auth rules pass against the room state before the event
         # https://spec.matrix.org/v1.3/server-server-api/#checks-performed-on-receipt-of-a-pdu:
@@ -1551,7 +1541,7 @@ async def _check_event_auth(
         if collections.Counter(event.auth_event_ids()) == collections.Counter(
             calculated_auth_event_ids
         ):
-            return context
+            return
 
         # otherwise, re-run the auth checks based on what we calculated.
         calculated_auth_events = await self._store.get_events_as_list(
@@ -1591,8 +1581,6 @@ async def _check_event_auth(
             )
             context.rejected = RejectedReason.AUTH_ERROR
 
-        return context
-
     async def _maybe_kick_guest_users(self, event: EventBase) -> None:
         if event.type != EventTypes.GuestAccess:
             return

tests/rest/client/test_third_party_rules.py

@@ -21,7 +21,6 @@
 from synapse.api.errors import SynapseError
 from synapse.api.room_versions import RoomVersion
 from synapse.events import EventBase
-from synapse.events.snapshot import EventContext
 from synapse.events.third_party_rules import load_legacy_third_party_event_rules
 from synapse.rest import admin
 from synapse.rest.client import account, login, profile, room
@@ -113,14 +112,8 @@ async def approve_all_signature_checking(
 
         # Have this homeserver skip event auth checks. This is necessary due to
         # event auth checks ensuring that events were signed by the sender's homeserver.
-        async def _check_event_auth(
-            origin: str,
-            event: EventBase,
-            context: EventContext,
-            *args: Any,
-            **kwargs: Any,
-        ) -> EventContext:
-            return context
+        async def _check_event_auth(origin: Any, event: Any, context: Any) -> None:
+            pass
 
         hs.get_federation_event_handler()._check_event_auth = _check_event_auth  # type: ignore[assignment]
 

tests/test_federation.py

@@ -81,12 +81,8 @@ def setUp(self):
         self.handler = self.homeserver.get_federation_handler()
         federation_event_handler = self.homeserver.get_federation_event_handler()
 
-        async def _check_event_auth(
-            origin,
-            event,
-            context,
-        ):
-            return context
+        async def _check_event_auth(origin, event, context):
+            pass
 
         federation_event_handler._check_event_auth = _check_event_auth
         self.client = self.homeserver.get_federation_client()