Sliding Sync: Add E2EE extension (MSC3884) (#17454)

Spec: [MSC3884](https://github.com/matrix-org/matrix-spec-proposals/pull/3884)

Based on [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575): Sliding Sync

1 files changed, 8 insertions, 2 deletions

diff --git a/synapse/rest/client/keys.py b/synapse/rest/client/keys.py

index 67de634eab..eddad7d5b8 100644
--- a/synapse/rest/client/keys.py
+++ b/synapse/rest/client/keys.py
@@ -256,9 +256,15 @@ class KeyChangesServlet(RestServlet):
 
         user_id = requester.user.to_string()
 
-        results = await self.device_handler.get_user_ids_changed(user_id, from_token)
+        device_list_updates = await self.device_handler.get_user_ids_changed(
+            user_id, from_token
+        )
+
+        response: JsonDict = {}
+        response["changed"] = list(device_list_updates.changed)
+        response["left"] = list(device_list_updates.left)
 
-        return 200, results
+        return 200, response
 
 
 class OneTimeKeyServlet(RestServlet):