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-rw-r--r--synapse/handlers/sync.py16
1 files changed, 11 insertions, 5 deletions
diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py
index dff1f67dcb..f748d9afb0 100644
--- a/synapse/handlers/sync.py
+++ b/synapse/handlers/sync.py
@@ -191,6 +191,7 @@ class SyncHandler(object):
         self.clock = hs.get_clock()
         self.response_cache = ResponseCache(hs, "sync")
         self.state = hs.get_state_handler()
+        self.auth = hs.get_auth()
 
         # ExpiringCache((User, Device)) -> LruCache(state_key => event_id)
         self.lazy_loaded_members_cache = ExpiringCache(
@@ -198,18 +199,23 @@ class SyncHandler(object):
             max_len=0, expiry_ms=LAZY_LOADED_MEMBERS_CACHE_MAX_AGE,
         )
 
+    @defer.inlineCallbacks
     def wait_for_sync_for_user(self, sync_config, since_token=None, timeout=0,
                                full_state=False):
         """Get the sync for a client if we have new data for it now. Otherwise
         wait for new data to arrive on the server. If the timeout expires, then
         return an empty sync result.
         Returns:
-            A Deferred SyncResult.
+            Deferred[SyncResult]
         """
-        return self.response_cache.wrap(
-            sync_config.request_key,
-            self._wait_for_sync_for_user,
-            sync_config, since_token, timeout, full_state,
+        yield self.auth.check_auth_blocking()
+
+        defer.returnValue(
+            self.response_cache.wrap(
+                sync_config.request_key,
+                self._wait_for_sync_for_user,
+                sync_config, since_token, timeout, full_state,
+            )
         )
 
     @defer.inlineCallbacks