2 files changed, 13 insertions, 1 deletions
diff --git a/synapse/handlers/appservice.py b/synapse/handlers/appservice.py
index 306686a384..b440280b74 100644
--- a/synapse/handlers/appservice.py
+++ b/synapse/handlers/appservice.py
@@ -176,6 +176,16 @@ class ApplicationServicesHandler(object):
         defer.returnValue(ret)
 
     @defer.inlineCallbacks
+    def get_3pe_protocols(self):
+        services = yield self.store.get_app_services()
+        protocols = {}
+        for s in services:
+            for p in s.protocols:
+                protocols[p] = yield self.appservice_api.get_3pe_protocol(s, p)
+
+        defer.returnValue(protocols)
+
+    @defer.inlineCallbacks
     def _get_services_for_event(self, event):
         """Retrieve a list of application services interested in this event.
 
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index 2b88e6550e..a6642ff232 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -387,7 +387,9 @@ class FederationHandler(BaseHandler):
                 )).addErrback(unwrapFirstError)
                 auth_events.update({a.event_id: a for a in results if a})
                 required_auth.update(
-                    a_id for event in results for a_id, _ in event.auth_events if event
+                    a_id
+                    for event in results if event
+                    for a_id, _ in event.auth_events
                 )
                 missing_auth = required_auth - set(auth_events)