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# Copyright 2023 The Matrix.org Foundation.
#
# 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.
from typing import Optional, Tuple
from typing_extensions import Protocol
from twisted.web.server import Request
from synapse.appservice import ApplicationService
from synapse.http.site import SynapseRequest
from synapse.types import Requester
# guests always get this device id.
GUEST_DEVICE_ID = "guest_device"
class Auth(Protocol):
"""The interface that an auth provider must implement."""
async def check_user_in_room(
self,
room_id: str,
requester: Requester,
allow_departed_users: bool = False,
) -> Tuple[str, Optional[str]]:
"""Check if the user is in the room, or was at some point.
Args:
room_id: The room to check.
user_id: The user to check.
current_state: Optional map of the current state of the room.
If provided then that map is used to check whether they are a
member of the room. Otherwise the current membership is
loaded from the database.
allow_departed_users: if True, accept users that were previously
members but have now departed.
Raises:
AuthError if the user is/was not in the room.
Returns:
The current membership of the user in the room and the
membership event ID of the user.
"""
async def get_user_by_req(
self,
request: SynapseRequest,
allow_guest: bool = False,
allow_expired: bool = False,
) -> Requester:
"""Get a registered user's ID.
Args:
request: An HTTP request with an access_token query parameter.
allow_guest: If False, will raise an AuthError if the user making the
request is a guest.
allow_expired: If True, allow the request through even if the account
is expired, or session token lifetime has ended. Note that
/login will deliver access tokens regardless of expiration.
Returns:
Resolves to the requester
Raises:
InvalidClientCredentialsError if no user by that token exists or the token
is invalid.
AuthError if access is denied for the user in the access token
"""
async def validate_appservice_can_control_user_id(
self, app_service: ApplicationService, user_id: str
) -> None:
"""Validates that the app service is allowed to control
the given user.
Args:
app_service: The app service that controls the user
user_id: The author MXID that the app service is controlling
Raises:
AuthError: If the application service is not allowed to control the user
(user namespace regex does not match, wrong homeserver, etc)
or if the user has not been registered yet.
"""
async def get_user_by_access_token(
self,
token: str,
allow_expired: bool = False,
) -> Requester:
"""Validate access token and get user_id from it
Args:
token: The access token to get the user by
allow_expired: If False, raises an InvalidClientTokenError
if the token is expired
Raises:
InvalidClientTokenError if a user by that token exists, but the token is
expired
InvalidClientCredentialsError if no user by that token exists or the token
is invalid
"""
async def is_server_admin(self, requester: Requester) -> bool:
"""Check if the given user is a local server admin.
Args:
requester: user to check
Returns:
True if the user is an admin
"""
async def check_can_change_room_list(
self, room_id: str, requester: Requester
) -> bool:
"""Determine whether the user is allowed to edit the room's entry in the
published room list.
Args:
room_id
user
"""
@staticmethod
def has_access_token(request: Request) -> bool:
"""Checks if the request has an access_token.
Returns:
False if no access_token was given, True otherwise.
"""
@staticmethod
def get_access_token_from_request(request: Request) -> str:
"""Extracts the access_token from the request.
Args:
request: The http request.
Returns:
The access_token
Raises:
MissingClientTokenError: If there isn't a single access_token in the
request
"""
async def check_user_in_room_or_world_readable(
self, room_id: str, requester: Requester, allow_departed_users: bool = False
) -> Tuple[str, Optional[str]]:
"""Checks that the user is or was in the room or the room is world
readable. If it isn't then an exception is raised.
Args:
room_id: room to check
user_id: user to check
allow_departed_users: if True, accept users that were previously
members but have now departed
Returns:
Resolves to the current membership of the user in the room and the
membership event ID of the user. If the user is not in the room and
never has been, then `(Membership.JOIN, None)` is returned.
"""
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