Actually query over AS API for 3PE lookup metadata

synapse/appservice/api.py

@@ -52,6 +52,13 @@ class ApplicationServiceApi(SimpleHttpClient):
     pushing.
     """
 
+    PROTOCOL_META = {
+        # TODO(paul): Declare kinds of metadata in here
+        "gitter": {
+            "user_fields": ["username"],
+        }
+    }
+
     def __init__(self, hs):
         super(ApplicationServiceApi, self).__init__(hs)
         self.clock = hs.get_clock()
@@ -131,6 +138,19 @@ class ApplicationServiceApi(SimpleHttpClient):
             logger.warning("query_3pe to %s threw exception %s", uri, ex)
             defer.returnValue([])
 
+    @defer.inlineCallbacks
+    def get_3pe_protocol(self, service, protocol):
+        # TODO: cache
+        uri = "%s/thirdparty/protocol/%s" % (service.url, urllib.quote(protocol))
+        try:
+            response = yield self.get_json(uri, {})
+            defer.returnValue(response)
+        except Exception as ex:
+            logger.warning("query_3pe_protocol to %s threw exception %s",
+                uri, ex
+            )
+            defer.returnValue({})
+
     @defer.inlineCallbacks
     def push_bulk(self, service, events, txn_id=None):
         events = self._serialize(events)

synapse/handlers/appservice.py

@@ -37,13 +37,6 @@ def log_failure(failure):
 
 class ApplicationServicesHandler(object):
 
-    PROTOCOL_META = {
-        # TODO(paul): Declare kinds of metadata in here
-        "gitter": {
-            "user_fields": ["username"],
-        }
-    }
-
     def __init__(self, hs):
         self.store = hs.get_datastore()
         self.is_mine_id = hs.is_mine_id
@@ -195,12 +188,7 @@ class ApplicationServicesHandler(object):
         protocols = {}
         for s in services:
             for p in s.protocols:
-                if p in self.PROTOCOL_META:
-                    protocols[p] = self.PROTOCOL_META[p]
-                else:
-                    # We don't know any metadata for it, but we'd best at least
-                    # still declare that we know it exists
-                    protocols[p] = {}
+                protocols[p] = yield self.appservice_api.get_3pe_protocol(s, p)
 
         self.supported_protocols = protocols
         defer.returnValue(protocols)