diff --git a/synapse/rest/client/v2_alpha/keys.py b/synapse/rest/client/v2_alpha/keys.py
index 46789775b9..4590efa6bf 100644
--- a/synapse/rest/client/v2_alpha/keys.py
+++ b/synapse/rest/client/v2_alpha/keys.py
@@ -21,6 +21,8 @@ from synapse.api.errors import SynapseError
from synapse.http.servlet import (
RestServlet, parse_json_object_from_request, parse_integer
)
+from synapse.http.servlet import parse_string
+from synapse.types import StreamToken
from ._base import client_v2_patterns
logger = logging.getLogger(__name__)
@@ -149,6 +151,52 @@ class KeyQueryServlet(RestServlet):
defer.returnValue((200, result))
+class KeyChangesServlet(RestServlet):
+ """Returns the list of changes of keys between two stream tokens (may return
+ spurious extra results, since we currently ignore the `to` param).
+
+ GET /keys/changes?from=...&to=...
+
+ 200 OK
+ { "changed": ["@foo:example.com"] }
+ """
+ PATTERNS = client_v2_patterns(
+ "/keys/changes$",
+ releases=()
+ )
+
+ def __init__(self, hs):
+ """
+ Args:
+ hs (synapse.server.HomeServer):
+ """
+ super(KeyChangesServlet, self).__init__()
+ self.auth = hs.get_auth()
+ self.device_handler = hs.get_device_handler()
+
+ @defer.inlineCallbacks
+ def on_GET(self, request):
+ requester = yield self.auth.get_user_by_req(request, allow_guest=True)
+
+ from_token_string = parse_string(request, "from")
+
+ # We want to enforce they do pass us one, but we ignore it and return
+ # changes after the "to" as well as before.
+ parse_string(request, "to")
+
+ from_token = StreamToken.from_string(from_token_string)
+
+ user_id = requester.user.to_string()
+
+ changed = yield self.device_handler.get_user_ids_changed(
+ user_id, from_token.device_list_key,
+ )
+
+ defer.returnValue((200, {
+ "changed": changed
+ }))
+
+
class OneTimeKeyServlet(RestServlet):
"""
POST /keys/claim HTTP/1.1
@@ -192,4 +240,5 @@ class OneTimeKeyServlet(RestServlet):
def register_servlets(hs, http_server):
KeyUploadServlet(hs).register(http_server)
KeyQueryServlet(hs).register(http_server)
+ KeyChangesServlet(hs).register(http_server)
OneTimeKeyServlet(hs).register(http_server)
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