diff --git a/synapse/replication/http/devices.py b/synapse/replication/http/devices.py
index 3d63645726..c21629def8 100644
--- a/synapse/replication/http/devices.py
+++ b/synapse/replication/http/devices.py
@@ -18,6 +18,7 @@ from typing import TYPE_CHECKING, Tuple
from twisted.web.server import Request
from synapse.http.server import HttpServer
+from synapse.http.servlet import parse_json_object_from_request
from synapse.replication.http._base import ReplicationEndpoint
from synapse.types import JsonDict
@@ -78,5 +79,71 @@ class ReplicationUserDevicesResyncRestServlet(ReplicationEndpoint):
return 200, user_devices
+class ReplicationUploadKeysForUserRestServlet(ReplicationEndpoint):
+ """Ask master to upload keys for the user and send them out over federation to
+ update other servers.
+
+ For now, only the master is permitted to handle key upload requests;
+ any worker can handle key query requests (since they're read-only).
+
+ Calls to e2e_keys_handler.upload_keys_for_user(user_id, device_id, keys) on
+ the main process to accomplish this.
+
+ Defined in https://spec.matrix.org/v1.4/client-server-api/#post_matrixclientv3keysupload
+ Request format(borrowed and expanded from KeyUploadServlet):
+
+ POST /_synapse/replication/upload_keys_for_user
+
+ {
+ "user_id": "<user_id>",
+ "device_id": "<device_id>",
+ "keys": {
+ ....this part can be found in KeyUploadServlet in rest/client/keys.py....
+ }
+ }
+
+ Response is equivalent to ` /_matrix/client/v3/keys/upload` found in KeyUploadServlet
+
+ """
+
+ NAME = "upload_keys_for_user"
+ PATH_ARGS = ()
+ CACHE = False
+
+ def __init__(self, hs: "HomeServer"):
+ super().__init__(hs)
+
+ self.e2e_keys_handler = hs.get_e2e_keys_handler()
+ self.store = hs.get_datastores().main
+ self.clock = hs.get_clock()
+
+ @staticmethod
+ async def _serialize_payload( # type: ignore[override]
+ user_id: str, device_id: str, keys: JsonDict
+ ) -> JsonDict:
+
+ return {
+ "user_id": user_id,
+ "device_id": device_id,
+ "keys": keys,
+ }
+
+ async def _handle_request( # type: ignore[override]
+ self, request: Request
+ ) -> Tuple[int, JsonDict]:
+ content = parse_json_object_from_request(request)
+
+ user_id = content["user_id"]
+ device_id = content["device_id"]
+ keys = content["keys"]
+
+ results = await self.e2e_keys_handler.upload_keys_for_user(
+ user_id, device_id, keys
+ )
+
+ return 200, results
+
+
def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
ReplicationUserDevicesResyncRestServlet(hs).register(http_server)
+ ReplicationUploadKeysForUserRestServlet(hs).register(http_server)
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