Implement knock feature (#6739)

This PR aims to implement the knock feature as proposed in https://github.com/matrix-org/matrix-doc/pull/2403

Signed-off-by: Sorunome mail@sorunome.de
Signed-off-by: Andrew Morgan andrewm@element.io

synapse/replication/http/membership.py

@@ -97,6 +97,76 @@ class ReplicationRemoteJoinRestServlet(ReplicationEndpoint):
         return 200, {"event_id": event_id, "stream_id": stream_id}
 
 
+class ReplicationRemoteKnockRestServlet(ReplicationEndpoint):
+    """Perform a remote knock for the given user on the given room
+
+    Request format:
+
+        POST /_synapse/replication/remote_knock/:room_id/:user_id
+
+        {
+            "requester": ...,
+            "remote_room_hosts": [...],
+            "content": { ... }
+        }
+    """
+
+    NAME = "remote_knock"
+    PATH_ARGS = ("room_id", "user_id")
+
+    def __init__(self, hs: "HomeServer"):
+        super().__init__(hs)
+
+        self.federation_handler = hs.get_federation_handler()
+        self.store = hs.get_datastore()
+        self.clock = hs.get_clock()
+
+    @staticmethod
+    async def _serialize_payload(  # type: ignore
+        requester: Requester,
+        room_id: str,
+        user_id: str,
+        remote_room_hosts: List[str],
+        content: JsonDict,
+    ):
+        """
+        Args:
+            requester: The user making the request, according to the access token.
+            room_id: The ID of the room to knock on.
+            user_id: The ID of the knocking user.
+            remote_room_hosts: Servers to try and send the knock via.
+            content: The event content to use for the knock event.
+        """
+        return {
+            "requester": requester.serialize(),
+            "remote_room_hosts": remote_room_hosts,
+            "content": content,
+        }
+
+    async def _handle_request(  # type: ignore
+        self,
+        request: SynapseRequest,
+        room_id: str,
+        user_id: str,
+    ):
+        content = parse_json_object_from_request(request)
+
+        remote_room_hosts = content["remote_room_hosts"]
+        event_content = content["content"]
+
+        requester = Requester.deserialize(self.store, content["requester"])
+
+        request.requester = requester
+
+        logger.debug("remote_knock: %s on room: %s", user_id, room_id)
+
+        event_id, stream_id = await self.federation_handler.do_knock(
+            remote_room_hosts, room_id, user_id, event_content
+        )
+
+        return 200, {"event_id": event_id, "stream_id": stream_id}
+
+
 class ReplicationRemoteRejectInviteRestServlet(ReplicationEndpoint):
     """Rejects an out-of-band invite we have received from a remote server
 
@@ -167,6 +237,75 @@ class ReplicationRemoteRejectInviteRestServlet(ReplicationEndpoint):
         return 200, {"event_id": event_id, "stream_id": stream_id}
 
 
+class ReplicationRemoteRescindKnockRestServlet(ReplicationEndpoint):
+    """Rescinds a local knock made on a remote room
+
+    Request format:
+
+        POST /_synapse/replication/remote_rescind_knock/:event_id
+
+        {
+            "txn_id": ...,
+            "requester": ...,
+            "content": { ... }
+        }
+    """
+
+    NAME = "remote_rescind_knock"
+    PATH_ARGS = ("knock_event_id",)
+
+    def __init__(self, hs: "HomeServer"):
+        super().__init__(hs)
+
+        self.store = hs.get_datastore()
+        self.clock = hs.get_clock()
+        self.member_handler = hs.get_room_member_handler()
+
+    @staticmethod
+    async def _serialize_payload(  # type: ignore
+        knock_event_id: str,
+        txn_id: Optional[str],
+        requester: Requester,
+        content: JsonDict,
+    ):
+        """
+        Args:
+            knock_event_id: The ID of the knock to be rescinded.
+            txn_id: An optional transaction ID supplied by the client.
+            requester: The user making the rescind request, according to the access token.
+            content: The content to include in the rescind event.
+        """
+        return {
+            "txn_id": txn_id,
+            "requester": requester.serialize(),
+            "content": content,
+        }
+
+    async def _handle_request(  # type: ignore
+        self,
+        request: SynapseRequest,
+        knock_event_id: str,
+    ):
+        content = parse_json_object_from_request(request)
+
+        txn_id = content["txn_id"]
+        event_content = content["content"]
+
+        requester = Requester.deserialize(self.store, content["requester"])
+
+        request.requester = requester
+
+        # hopefully we're now on the master, so this won't recurse!
+        event_id, stream_id = await self.member_handler.remote_rescind_knock(
+            knock_event_id,
+            txn_id,
+            requester,
+            event_content,
+        )
+
+        return 200, {"event_id": event_id, "stream_id": stream_id}
+
+
 class ReplicationUserJoinedLeftRoomRestServlet(ReplicationEndpoint):
     """Notifies that a user has joined or left the room