forked-synapse/synapse/rest/client/knock.py

#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# Copyright 2020 The Matrix.org Foundation C.I.C.
# Copyright 2020 Sorunome
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# See the GNU Affero General Public License for more details:
# <https://www.gnu.org/licenses/agpl-3.0.html>.
#
# Originally licensed under the Apache License, Version 2.0:
# <http://www.apache.org/licenses/LICENSE-2.0>.
#
# [This file includes modifications made by New Vector Limited]
#
#
import logging
from typing import TYPE_CHECKING, Dict, List, Tuple

from synapse.api.constants import Membership
from synapse.api.errors import SynapseError
from synapse.http.server import HttpServer
from synapse.http.servlet import (
    RestServlet,
    parse_json_object_from_request,
    parse_strings_from_args,
)
from synapse.http.site import SynapseRequest
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 /knock/{roomIdOrAlias}
    """

    PATTERNS = client_patterns("/knock/(?P<room_identifier>[^/]*)")
    CATEGORY = "Event sending requests"

    def __init__(self, hs: "HomeServer"):
        super().__init__()
        self.room_member_handler = hs.get_room_member_handler()
        self.auth = hs.get_auth()
        self._support_via = hs.config.experimental.msc4156_enabled

    async def on_POST(
        self,
        request: SynapseRequest,
        room_identifier: str,
    ) -> 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
            )
            if self._support_via:
                remote_room_hosts = parse_strings_from_args(
                    args,
                    "org.matrix.msc4156.via",
                    default=remote_room_hosts,
                    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,
            third_party_signed=None,
            remote_room_hosts=remote_room_hosts,
            content=event_content,
        )

        return 200, {"room_id": room_id}


def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
    KnockRoomAliasServlet(hs).register(http_server)