Support unprefixed versions of fallback key property names. (#11541)

2 files changed, 6 insertions, 1 deletions

diff --git a/synapse/handlers/e2e_keys.py b/synapse/handlers/e2e_keys.py

index b2554bda04..14360b4e40 100644
--- a/synapse/handlers/e2e_keys.py
+++ b/synapse/handlers/e2e_keys.py
@@ -580,7 +580,9 @@ class E2eKeysHandler:
             log_kv(
                 {"message": "Did not update one_time_keys", "reason": "no keys given"}
             )
-        fallback_keys = keys.get("org.matrix.msc2732.fallback_keys", None)
+        fallback_keys = keys.get("fallback_keys") or keys.get(
+            "org.matrix.msc2732.fallback_keys"
+        )
         if fallback_keys and isinstance(fallback_keys, dict):
             log_kv(
                 {
diff --git a/synapse/rest/client/sync.py b/synapse/rest/client/sync.py

index 88e4f5e063..dd90ffa123 100644
--- a/synapse/rest/client/sync.py
+++ b/synapse/rest/client/sync.py
@@ -293,6 +293,9 @@ class SyncRestServlet(RestServlet):
         response[
             "org.matrix.msc2732.device_unused_fallback_key_types"
         ] = sync_result.device_unused_fallback_key_types
+        response[
+            "device_unused_fallback_key_types"
+        ] = sync_result.device_unused_fallback_key_types
 
         if joined:
             response["rooms"][Membership.JOIN] = joined