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-rw-r--r--synapse/handlers/directory.py11
1 files changed, 10 insertions, 1 deletions
diff --git a/synapse/handlers/directory.py b/synapse/handlers/directory.py
index 2e9c6b688b..22aab9b0a8 100644
--- a/synapse/handlers/directory.py
+++ b/synapse/handlers/directory.py
@@ -37,7 +37,7 @@ class DirectoryHandler(BaseHandler):
         )
 
     @defer.inlineCallbacks
-    def create_association(self, room_alias, room_id, servers):
+    def create_association(self, room_alias, room_id, servers=None):
         # TODO(erikj): Do auth.
 
         if not room_alias.is_mine:
@@ -48,6 +48,12 @@ class DirectoryHandler(BaseHandler):
 
         # TODO(erikj): Check if there is a current association.
 
+        if not servers:
+            servers = yield self.store.get_joined_hosts_for_room(room_id)
+
+        if not servers:
+            raise SynapseError(400, "Failed to get server list")
+
         yield self.store.create_room_alias_association(
             room_alias,
             room_id,
@@ -83,6 +89,9 @@ class DirectoryHandler(BaseHandler):
             defer.returnValue({})
             return
 
+        extra_servers = yield self.store.get_joined_hosts_for_room(room_id)
+        servers = list(set(extra_servers) | set(servers))
+
         defer.returnValue({
             "room_id": room_id,
             "servers": servers,