diff --git a/synapse/rest/client/v2_alpha/knock.py b/synapse/rest/client/v2_alpha/knock.py
new file mode 100644
index 0000000000..f046bf9cb3
--- /dev/null
+++ b/synapse/rest/client/v2_alpha/knock.py
@@ -0,0 +1,109 @@
+# Copyright 2020 Sorunome
+# Copyright 2020 The Matrix.org Foundation C.I.C.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import logging
+from typing import TYPE_CHECKING, Dict, List, Optional, Tuple
+
+from twisted.web.server import Request
+
+from synapse.api.constants import Membership
+from synapse.api.errors import SynapseError
+from synapse.http.servlet import (
+ RestServlet,
+ parse_json_object_from_request,
+ parse_strings_from_args,
+)
+from synapse.http.site import SynapseRequest
+from synapse.logging.opentracing import set_tag
+from synapse.rest.client.transactions import HttpTransactionCache
+from synapse.types import JsonDict, RoomAlias, RoomID
+
+if TYPE_CHECKING:
+ from synapse.app.homeserver import HomeServer
+
+from ._base import client_patterns
+
+logger = logging.getLogger(__name__)
+
+
+class KnockRoomAliasServlet(RestServlet):
+ """
+ POST /xyz.amorgan.knock/{roomIdOrAlias}
+ """
+
+ PATTERNS = client_patterns(
+ "/xyz.amorgan.knock/(?P<room_identifier>[^/]*)", releases=()
+ )
+
+ def __init__(self, hs: "HomeServer"):
+ super().__init__()
+ self.txns = HttpTransactionCache(hs)
+ self.room_member_handler = hs.get_room_member_handler()
+ self.auth = hs.get_auth()
+
+ async def on_POST(
+ self,
+ request: SynapseRequest,
+ room_identifier: str,
+ txn_id: Optional[str] = None,
+ ) -> Tuple[int, JsonDict]:
+ requester = await self.auth.get_user_by_req(request)
+
+ content = parse_json_object_from_request(request)
+ event_content = None
+ if "reason" in content:
+ event_content = {"reason": content["reason"]}
+
+ if RoomID.is_valid(room_identifier):
+ room_id = room_identifier
+
+ # twisted.web.server.Request.args is incorrectly defined as Optional[Any]
+ args: Dict[bytes, List[bytes]] = request.args # type: ignore
+
+ remote_room_hosts = parse_strings_from_args(
+ args, "server_name", required=False
+ )
+ elif RoomAlias.is_valid(room_identifier):
+ handler = self.room_member_handler
+ room_alias = RoomAlias.from_string(room_identifier)
+ room_id_obj, remote_room_hosts = await handler.lookup_room_alias(room_alias)
+ room_id = room_id_obj.to_string()
+ else:
+ raise SynapseError(
+ 400, "%s was not legal room ID or room alias" % (room_identifier,)
+ )
+
+ await self.room_member_handler.update_membership(
+ requester=requester,
+ target=requester.user,
+ room_id=room_id,
+ action=Membership.KNOCK,
+ txn_id=txn_id,
+ third_party_signed=None,
+ remote_room_hosts=remote_room_hosts,
+ content=event_content,
+ )
+
+ return 200, {"room_id": room_id}
+
+ def on_PUT(self, request: Request, room_identifier: str, txn_id: str):
+ set_tag("txn_id", txn_id)
+
+ return self.txns.fetch_or_execute_request(
+ request, self.on_POST, request, room_identifier, txn_id
+ )
+
+
+def register_servlets(hs, http_server):
+ KnockRoomAliasServlet(hs).register(http_server)
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