allow m.room.summary and m.room.encryption events in invites

to provide better UX for clients receiving invites, so they
can show a padlock icon or correct avatars on the inbound invite

synapse/api/constants.py

@@ -70,6 +70,8 @@ class EventTypes(object):
     RoomHistoryVisibility = "m.room.history_visibility"
     CanonicalAlias = "m.room.canonical_alias"
     RoomAvatar = "m.room.avatar"
+    RoomSummary = "m.room.summary"
+    RoomEncryption = "m.room.encryption"
     GuestAccess = "m.room.guest_access"
 
     # These are used for validation

synapse/config/api.py

@@ -24,6 +24,8 @@ class ApiConfig(Config):
             EventTypes.JoinRules,
             EventTypes.CanonicalAlias,
             EventTypes.RoomAvatar,
+            EventTypes.RoomSummary,
+            EventTypes.RoomEncryption,
             EventTypes.Name,
         ])
 
@@ -36,5 +38,7 @@ class ApiConfig(Config):
             - "{JoinRules}"
             - "{CanonicalAlias}"
             - "{RoomAvatar}"
+            - "{RoomSummary}"
+            - "{RoomEncryption}"
             - "{Name}"
         """.format(**vars(EventTypes))