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-rw-r--r--synapse/api/auth.py10
1 files changed, 6 insertions, 4 deletions
diff --git a/synapse/api/auth.py b/synapse/api/auth.py
index f26e585623..dcda40863f 100644
--- a/synapse/api/auth.py
+++ b/synapse/api/auth.py
@@ -66,7 +66,7 @@ class Auth(object):
     @defer.inlineCallbacks
     def check_from_context(self, event, context, do_sig_check=True):
         auth_events_ids = yield self.compute_auth_events(
-            event, context.current_state_ids, for_verification=True,
+            event, context.prev_state_ids, for_verification=True,
         )
         auth_events = yield self.store.get_events(auth_events_ids)
         auth_events = {
@@ -281,11 +281,13 @@ class Auth(object):
         with Measure(self.clock, "check_host_in_room"):
             latest_event_ids = yield self.store.get_latest_event_ids_in_room(room_id)
 
-            group, curr_state_ids = yield self.state.resolve_state_groups(
+            entry = yield self.state.resolve_state_groups(
                 room_id, latest_event_ids
             )
 
-            ret = yield self.store.is_host_joined(room_id, host, group, curr_state_ids)
+            ret = yield self.store.is_host_joined(
+                room_id, host, entry.state_group, entry.state
+            )
             defer.returnValue(ret)
 
     def check_event_sender_in_room(self, event, auth_events):
@@ -852,7 +854,7 @@ class Auth(object):
 
     @defer.inlineCallbacks
     def add_auth_events(self, builder, context):
-        auth_ids = yield self.compute_auth_events(builder, context.current_state_ids)
+        auth_ids = yield self.compute_auth_events(builder, context.prev_state_ids)
 
         auth_events_entries = yield self.store.add_event_hashes(
             auth_ids