1 files changed, 21 insertions, 4 deletions
diff --git a/synapse/federation/transport/server/federation.py b/synapse/federation/transport/server/federation.py
index e2340d70d5..36b0362504 100644
--- a/synapse/federation/transport/server/federation.py
+++ b/synapse/federation/transport/server/federation.py
@@ -12,6 +12,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 import logging
+from collections import Counter
 from typing import (
     TYPE_CHECKING,
     Dict,
@@ -577,16 +578,23 @@ class FederationClientKeysClaimServlet(BaseFederationServerServlet):
     async def on_POST(
         self, origin: str, content: JsonDict, query: Dict[bytes, List[bytes]]
     ) -> Tuple[int, JsonDict]:
+        # Generate a count for each algorithm, which is hard-coded to 1.
+        key_query: List[Tuple[str, str, str, int]] = []
+        for user_id, device_keys in content.get("one_time_keys", {}).items():
+            for device_id, algorithm in device_keys.items():
+                key_query.append((user_id, device_id, algorithm, 1))
+
         response = await self.handler.on_claim_client_keys(
-            origin, content, always_include_fallback_keys=False
+            key_query, always_include_fallback_keys=False
         )
         return 200, response
 
 
 class FederationUnstableClientKeysClaimServlet(BaseFederationServerServlet):
     """
-    Identical to the stable endpoint (FederationClientKeysClaimServlet) except it
-    always includes fallback keys in the response.
+    Identical to the stable endpoint (FederationClientKeysClaimServlet) except
+    it allows for querying for multiple OTKs at once and always includes fallback
+    keys in the response.
     """
 
     PREFIX = FEDERATION_UNSTABLE_PREFIX
@@ -596,8 +604,16 @@ class FederationUnstableClientKeysClaimServlet(BaseFederationServerServlet):
     async def on_POST(
         self, origin: str, content: JsonDict, query: Dict[bytes, List[bytes]]
     ) -> Tuple[int, JsonDict]:
+        # Generate a count for each algorithm.
+        key_query: List[Tuple[str, str, str, int]] = []
+        for user_id, device_keys in content.get("one_time_keys", {}).items():
+            for device_id, algorithms in device_keys.items():
+                counts = Counter(algorithms)
+                for algorithm, count in counts.items():
+                    key_query.append((user_id, device_id, algorithm, count))
+
         response = await self.handler.on_claim_client_keys(
-            origin, content, always_include_fallback_keys=True
+            key_query, always_include_fallback_keys=True
         )
         return 200, response
 
@@ -805,6 +821,7 @@ FEDERATION_SERVLET_CLASSES: Tuple[Type[BaseFederationServlet], ...] = (
     FederationClientKeysQueryServlet,
     FederationUserDevicesQueryServlet,
     FederationClientKeysClaimServlet,
+    FederationUnstableClientKeysClaimServlet,
     FederationThirdPartyInviteExchangeServlet,
     On3pidBindServlet,
     FederationVersionServlet,