# Copyright 2017 New Vector Ltd
# 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, Any, Generator, Iterable, List, Optional, Tuple
from twisted.internet import defer
from synapse.events import EventBase
from synapse.http.client import SimpleHttpClient
from synapse.http.site import SynapseRequest
from synapse.logging.context import make_deferred_yieldable, run_in_background
from synapse.storage.state import StateFilter
from synapse.types import JsonDict, UserID, create_requester
if TYPE_CHECKING:
from synapse.server import HomeServer
"""
This package defines the 'stable' API which can be used by extension modules which
are loaded into Synapse.
"""
__all__ = ["errors", "make_deferred_yieldable", "run_in_background", "ModuleApi"]
logger = logging.getLogger(__name__)
class ModuleApi:
"""A proxy object that gets passed to various plugin modules so they
can register new users etc if necessary.
"""
def __init__(self, hs, auth_handler):
self._hs = hs
self._store = hs.get_datastore()
self._auth = hs.get_auth()
self._auth_handler = auth_handler
self._server_name = hs.hostname
self._presence_stream = hs.get_event_sources().sources["presence"]
self._state = hs.get_state_handler()
# We expose these as properties below in order to attach a helpful docstring.
self._http_client = hs.get_simple_http_client() # type: SimpleHttpClient
self._public_room_list_manager = PublicRoomListManager(hs)
# The next time these users sync, they will receive the current presence
# state of all local users. Users are added by send_local_online_presence_to,
# and removed after a successful sync.
#
# We make this a private variable to deter modules from accessing it directly,
# though other classes in Synapse will still do so.
self._send_full_presence_to_local_users = set()
@property
def http_client(self):
"""Allows making outbound HTTP requests to remote resources.
An instance of synapse.http.client.SimpleHttpClient
"""
return self._http_client
@property
def public_room_list_manager(self):
"""Allows adding to, removing from and checking the status of rooms in the
public room list.
An instance of synapse.module_api.PublicRoomListManager
"""
return self._public_room_list_manager
def get_user_by_req(self, req, allow_guest=False):
"""Check the access_token provided for a request
Args:
req (twisted.web.server.Request): Incoming HTTP request
allow_guest (bool): True if guest users should be allowed. If this
is False, and the access token is for a guest user, an
AuthError will be thrown
Returns:
twisted.internet.defer.Deferred[synapse.types.Requester]:
the requester for this request
Raises:
synapse.api.errors.AuthError: if no user by that token exists,
or the token is invalid.
"""
return self._auth.get_user_by_req(req, allow_guest)
def get_qualified_user_id(self, username):
"""Qualify a user id, if necessary
Takes a user id provided by the user and adds the @ and :domain to
qualify it, if necessary
Args:
username (str): provided user id
Returns:
str: qualified @user:id
"""
if username.startswith("@"):
return username
return UserID(username, self._hs.hostname).to_string()
def check_user_exists(self, user_id):
"""Check if user exists.
Args:
user_id (str): Complete @user:id
Returns:
Deferred[str|None]: Canonical (case-corrected) user_id, or None
if the user is not registered.
"""
return defer.ensureDeferred(self._auth_handler.check_user_exists(user_id))
@defer.inlineCallbacks
def register(self, localpart, displayname=None, emails: Optional[List[str]] = None):
"""Registers a new user with given localpart and optional displayname, emails.
Also returns an access token for the new user.
Deprecated: avoid this, as it generates a new device with no way to
return that device to the user. Prefer separate calls to register_user and
register_device.
Args:
localpart (str): The localpart of the new user.
displayname (str|None): The displayname of the new user.
emails (List[str]): Emails to bind to the new user.
Returns:
Deferred[tuple[str, str]]: a 2-tuple of (user_id, access_token)
"""
logger.warning(
"Using deprecated ModuleApi.register which creates a dummy user device."
)
user_id = yield self.register_user(localpart, displayname, emails or [])
_, access_token = yield self.register_device(user_id)
return user_id, access_token
def register_user(
self, localpart, displayname=None, emails: Optional[List[str]] = None
):
"""Registers a new user with given localpart and optional displayname, emails.
Args:
localpart (str): The localpart of the new user.
displayname (str|None): The displayname of the new user.
emails (List[str]): Emails to bind to the new user.
Raises:
SynapseError if there is an error performing the registration. Check the
'errcode' property for more information on the reason for failure
Returns:
defer.Deferred[str]: user_id
"""
return defer.ensureDeferred(
self._hs.get_registration_handler().register_user(
localpart=localpart,
default_display_name=displayname,
bind_emails=emails or [],
)
)
def register_device(self, user_id, device_id=None, initial_display_name=None):
"""Register a device for a user and generate an access token.
Args:
user_id (str): full canonical @user:id
device_id (str|None): The device ID to check, or None to generate
a new one.
initial_display_name (str|None): An optional display name for the
device.
Returns:
defer.Deferred[tuple[str, str]]: Tuple of device ID and access token
"""
return defer.ensureDeferred(
self._hs.get_registration_handler().register_device(
user_id=user_id,
device_id=device_id,
initial_display_name=initial_display_name,
)
)
def record_user_external_id(
self, auth_provider_id: str, remote_user_id: str, registered_user_id: str
) -> defer.Deferred:
"""Record a mapping from an external user id to a mxid
Args:
auth_provider: identifier for the remote auth provider
external_id: id on that system
user_id: complete mxid that it is mapped to
"""
return defer.ensureDeferred(
self._store.record_user_external_id(
auth_provider_id, remote_user_id, registered_user_id
)
)
def generate_short_term_login_token(
self,
user_id: str,
duration_in_ms: int = (2 * 60 * 1000),
auth_provider_id: str = "",
) -> str:
"""Generate a login token suitable for m.login.token authentication
Args:
user_id: gives the ID of the user that the token is for
duration_in_ms: the time that the token will be valid for
auth_provider_id: the ID of the SSO IdP that the user used to authenticate
to get this token, if any. This is encoded in the token so that
/login can report stats on number of successful logins by IdP.
"""
return self._hs.get_macaroon_generator().generate_short_term_login_token(
user_id,
auth_provider_id,
duration_in_ms,
)
@defer.inlineCallbacks
def invalidate_access_token(self, access_token):
"""Invalidate an access token for a user
Args:
access_token(str): access token
Returns:
twisted.internet.defer.Deferred - resolves once the access token
has been removed.
Raises:
synapse.api.errors.AuthError: the access token is invalid
"""
# see if the access token corresponds to a device
user_info = yield defer.ensureDeferred(
self._auth.get_user_by_access_token(access_token)
)
device_id = user_info.get("device_id")
user_id = user_info["user"].to_string()
if device_id:
# delete the device, which will also delete its access tokens
yield defer.ensureDeferred(
self._hs.get_device_handler().delete_device(user_id, device_id)
)
else:
# no associated device. Just delete the access token.
yield defer.ensureDeferred(
self._auth_handler.delete_access_token(access_token)
)
def run_db_interaction(self, desc, func, *args, **kwargs):
"""Run a function with a database connection
Args:
desc (str): description for the transaction, for metrics etc
func (func): function to be run. Passed a database cursor object
as well as *args and **kwargs
*args: positional args to be passed to func
**kwargs: named args to be passed to func
Returns:
Deferred[object]: result of func
"""
return defer.ensureDeferred(
self._store.db_pool.runInteraction(desc, func, *args, **kwargs)
)
def complete_sso_login(
self, registered_user_id: str, request: SynapseRequest, client_redirect_url: str
):
"""Complete a SSO login by redirecting the user to a page to confirm whether they
want their access token sent to `client_redirect_url`, or redirect them to that
URL with a token directly if the URL matches with one of the whitelisted clients.
This is deprecated in favor of complete_sso_login_async.
Args:
registered_user_id: The MXID that has been registered as a previous step of
of this SSO login.
request: The request to respond to.
client_redirect_url: The URL to which to offer to redirect the user (or to
redirect them directly if whitelisted).
"""
self._auth_handler._complete_sso_login(
registered_user_id,
"<unknown>",
request,
client_redirect_url,
)
async def complete_sso_login_async(
self,
registered_user_id: str,
request: SynapseRequest,
client_redirect_url: str,
new_user: bool = False,
auth_provider_id: str = "<unknown>",
):
"""Complete a SSO login by redirecting the user to a page to confirm whether they
want their access token sent to `client_redirect_url`, or redirect them to that
URL with a token directly if the URL matches with one of the whitelisted clients.
Args:
registered_user_id: The MXID that has been registered as a previous step of
of this SSO login.
request: The request to respond to.
client_redirect_url: The URL to which to offer to redirect the user (or to
redirect them directly if whitelisted).
new_user: set to true to use wording for the consent appropriate to a user
who has just registered.
auth_provider_id: the ID of the SSO IdP which was used to log in. This
is used to track counts of sucessful logins by IdP.
"""
await self._auth_handler.complete_sso_login(
registered_user_id,
auth_provider_id,
request,
client_redirect_url,
new_user=new_user,
)
@defer.inlineCallbacks
def get_state_events_in_room(
self, room_id: str, types: Iterable[Tuple[str, Optional[str]]]
) -> Generator[defer.Deferred, Any, defer.Deferred]:
"""Gets current state events for the given room.
(This is exposed for compatibility with the old SpamCheckerApi. We should
probably deprecate it and replace it with an async method in a subclass.)
Args:
room_id: The room ID to get state events in.
types: The event type and state key (using None
to represent 'any') of the room state to acquire.
Returns:
twisted.internet.defer.Deferred[list(synapse.events.FrozenEvent)]:
The filtered state events in the room.
"""
state_ids = yield defer.ensureDeferred(
self._store.get_filtered_current_state_ids(
room_id=room_id, state_filter=StateFilter.from_types(types)
)
)
state = yield defer.ensureDeferred(self._store.get_events(state_ids.values()))
return state.values()
async def create_and_send_event_into_room(self, event_dict: JsonDict) -> EventBase:
"""Create and send an event into a room. Membership events are currently not supported.
Args:
event_dict: A dictionary representing the event to send.
Required keys are `type`, `room_id`, `sender` and `content`.
Returns:
The event that was sent. If state event deduplication happened, then
the previous, duplicate event instead.
Raises:
SynapseError if the event was not allowed.
"""
# Create a requester object
requester = create_requester(
event_dict["sender"], authenticated_entity=self._server_name
)
# Create and send the event
(
event,
_,
) = await self._hs.get_event_creation_handler().create_and_send_nonmember_event(
requester,
event_dict,
ratelimit=False,
ignore_shadow_ban=True,
)
return event
async def send_local_online_presence_to(self, users: Iterable[str]) -> None:
"""
Forces the equivalent of a presence initial_sync for a set of local or remote
users. The users will receive presence for all currently online users that they
are considered interested in.
Updates to remote users will be sent immediately, whereas local users will receive
them on their next sync attempt.
Note that this method can only be run on the main or federation_sender worker
processes.
"""
if not self._hs.should_send_federation():
raise Exception(
"send_local_online_presence_to can only be run "
"on processes that send federation",
)
for user in users:
if self._hs.is_mine_id(user):
# Modify SyncHandler._generate_sync_entry_for_presence to call
# presence_source.get_new_events with an empty `from_key` if
# that user's ID were in a list modified by ModuleApi somewhere.
# That user would then get all presence state on next incremental sync.
# Force a presence initial_sync for this user next time
self._send_full_presence_to_local_users.add(user)
else:
# Retrieve presence state for currently online users that this user
# is considered interested in
presence_events, _ = await self._presence_stream.get_new_events(
UserID.from_string(user), from_key=None, include_offline=False
)
# Send to remote destinations.
# We pull out the presence handler here to break a cyclic
# dependency between the presence router and module API.
presence_handler = self._hs.get_presence_handler()
await presence_handler.maybe_send_presence_to_interested_destinations(
presence_events
)
class PublicRoomListManager:
"""Contains methods for adding to, removing from and querying whether a room
is in the public room list.
"""
def __init__(self, hs: "HomeServer"):
self._store = hs.get_datastore()
async def room_is_in_public_room_list(self, room_id: str) -> bool:
"""Checks whether a room is in the public room list.
Args:
room_id: The ID of the room.
Returns:
Whether the room is in the public room list. Returns False if the room does
not exist.
"""
room = await self._store.get_room(room_id)
if not room:
return False
return room.get("is_public", False)
async def add_room_to_public_room_list(self, room_id: str) -> None:
"""Publishes a room to the public room list.
Args:
room_id: The ID of the room.
"""
await self._store.set_room_is_public(room_id, True)
async def remove_room_from_public_room_list(self, room_id: str) -> None:
"""Removes a room from the public room list.
Args:
room_id: The ID of the room.
"""
await self._store.set_room_is_public(room_id, False)