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#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# 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, Tuple
from synapse.api.errors import AuthError
from synapse.http.server import HttpServer
from synapse.http.servlet import RestServlet, parse_json_object_from_request
from synapse.http.site import SynapseRequest
from synapse.types import JsonDict
from synapse.util.stringutils import random_string
from ._base import client_patterns
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
class IdTokenServlet(RestServlet):
"""
Get a bearer token that may be passed to a third party to confirm ownership
of a matrix user id.
The format of the response could be made compatible with the format given
in http://openid.net/specs/openid-connect-core-1_0.html#TokenResponse
But instead of returning a signed "id_token" the response contains the
name of the issuing matrix homeserver. This means that for now the third
party will need to check the validity of the "id_token" against the
federation /openid/userinfo endpoint of the homeserver.
Request:
POST /user/{user_id}/openid/request_token?access_token=... HTTP/1.1
{}
Response:
HTTP/1.1 200 OK
{
"access_token": "ABDEFGH",
"token_type": "Bearer",
"matrix_server_name": "example.com",
"expires_in": 3600,
}
"""
PATTERNS = client_patterns("/user/(?P<user_id>[^/]*)/openid/request_token")
EXPIRES_MS = 3600 * 1000
def __init__(self, hs: "HomeServer"):
super().__init__()
self.auth = hs.get_auth()
self.store = hs.get_datastores().main
self.clock = hs.get_clock()
self.server_name = hs.config.server.server_name
async def on_POST(
self, request: SynapseRequest, user_id: str
) -> Tuple[int, JsonDict]:
requester = await self.auth.get_user_by_req(request)
if user_id != requester.user.to_string():
raise AuthError(403, "Cannot request tokens for other users.")
# Parse the request body to make sure it's JSON, but ignore the contents
# for now.
parse_json_object_from_request(request)
token = random_string(24)
ts_valid_until_ms = self.clock.time_msec() + self.EXPIRES_MS
await self.store.insert_open_id_token(token, ts_valid_until_ms, user_id)
return (
200,
{
"access_token": token,
"token_type": "Bearer",
"matrix_server_name": self.server_name,
"expires_in": self.EXPIRES_MS // 1000,
},
)
def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
IdTokenServlet(hs).register(http_server)
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