Implement device key caching over federation

2 files changed, 34 insertions, 0 deletions

diff --git a/synapse/federation/transport/client.py b/synapse/federation/transport/client.py
index 915af34409..f49e8a2cc4 100644
--- a/synapse/federation/transport/client.py
+++ b/synapse/federation/transport/client.py
@@ -348,6 +348,32 @@ class TransportLayerClient(object):
 
     @defer.inlineCallbacks
     @log_function
+    def query_user_devices(self, destination, user_id, timeout):
+        """Query the devices for a user id hosted on a remote server.
+
+        Response:
+            {
+              "stream_id": "...",
+              "devices": [ { ... } ]
+            }
+
+        Args:
+            destination(str): The server to query.
+            query_content(dict): The user ids to query.
+        Returns:
+            A dict containg the device keys.
+        """
+        path = PREFIX + "/user/devices/" + user_id
+
+        content = yield self.client.get_json(
+            destination=destination,
+            path=path,
+            timeout=timeout,
+        )
+        defer.returnValue(content)
+
+    @defer.inlineCallbacks
+    @log_function
     def claim_client_keys(self, destination, query_content, timeout):
         """Claim one-time keys for a list of devices hosted on a remote server.
 
diff --git a/synapse/federation/transport/server.py b/synapse/federation/transport/server.py
index 159dbd1747..c840da834c 100644
--- a/synapse/federation/transport/server.py
+++ b/synapse/federation/transport/server.py
@@ -409,6 +409,13 @@ class FederationClientKeysQueryServlet(BaseFederationServlet):
         return self.handler.on_query_client_keys(origin, content)
 
 
+class FederationUserDevicesQueryServlet(BaseFederationServlet):
+    PATH = "/user/devices/(?P<user_id>[^/]*)"
+
+    def on_GET(self, origin, content, query, user_id):
+        return self.handler.on_query_user_devices(origin, user_id)
+
+
 class FederationClientKeysClaimServlet(BaseFederationServlet):
     PATH = "/user/keys/claim"
 
@@ -613,6 +620,7 @@ SERVLET_CLASSES = (
     FederationGetMissingEventsServlet,
     FederationEventAuthServlet,
     FederationClientKeysQueryServlet,
+    FederationUserDevicesQueryServlet,
     FederationClientKeysClaimServlet,
     FederationThirdPartyInviteExchangeServlet,
     On3pidBindServlet,