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# -*- coding: utf-8 -*-
# Copyright 2017, 2018 New Vector Ltd
# Copyright 2019 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 synapse.api.errors import SynapseError
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.types import UserID, create_requester
from ._base import BaseHandler
logger = logging.getLogger(__name__)
class DeactivateAccountHandler(BaseHandler):
"""Handler which deals with deactivating user accounts."""
def __init__(self, hs):
super(DeactivateAccountHandler, self).__init__(hs)
self._auth_handler = hs.get_auth_handler()
self._device_handler = hs.get_device_handler()
self._room_member_handler = hs.get_room_member_handler()
self._identity_handler = hs.get_handlers().identity_handler
self.user_directory_handler = hs.get_user_directory_handler()
# Flag that indicates whether the process to part users from rooms is running
self._user_parter_running = False
# Start the user parter loop so it can resume parting users from rooms where
# it left off (if it has work left to do).
if hs.config.worker_app is None:
hs.get_reactor().callWhenRunning(self._start_user_parting)
self._account_validity_enabled = hs.config.account_validity.enabled
async def deactivate_account(self, user_id, erase_data, id_server=None):
"""Deactivate a user's account
Args:
user_id (str): ID of user to be deactivated
erase_data (bool): whether to GDPR-erase the user's data
id_server (str|None): Use the given identity server when unbinding
any threepids. If None then will attempt to unbind using the
identity server specified when binding (if known).
Returns:
Deferred[bool]: True if identity server supports removing
threepids, otherwise False.
"""
# FIXME: Theoretically there is a race here wherein user resets
# password using threepid.
# delete threepids first. We remove these from the IS so if this fails,
# leave the user still active so they can try again.
# Ideally we would prevent password resets and then do this in the
# background thread.
# This will be set to false if the identity server doesn't support
# unbinding
identity_server_supports_unbinding = True
# Retrieve the 3PIDs this user has bound to an identity server
threepids = await self.store.user_get_bound_threepids(user_id)
for threepid in threepids:
try:
result = await self._identity_handler.try_unbind_threepid(
user_id,
{
"medium": threepid["medium"],
"address": threepid["address"],
"id_server": id_server,
},
)
identity_server_supports_unbinding &= result
except Exception:
# Do we want this to be a fatal error or should we carry on?
logger.exception("Failed to remove threepid from ID server")
raise SynapseError(400, "Failed to remove threepid from ID server")
await self.store.user_delete_threepid(
user_id, threepid["medium"], threepid["address"]
)
# Remove all 3PIDs this user has bound to the homeserver
await self.store.user_delete_threepids(user_id)
# delete any devices belonging to the user, which will also
# delete corresponding access tokens.
await self._device_handler.delete_all_devices_for_user(user_id)
# then delete any remaining access tokens which weren't associated with
# a device.
await self._auth_handler.delete_access_tokens_for_user(user_id)
await self.store.user_set_password_hash(user_id, None)
# Add the user to a table of users pending deactivation (ie.
# removal from all the rooms they're a member of)
await self.store.add_user_pending_deactivation(user_id)
# delete from user directory
await self.user_directory_handler.handle_user_deactivated(user_id)
# Mark the user as erased, if they asked for that
if erase_data:
logger.info("Marking %s as erased", user_id)
await self.store.mark_user_erased(user_id)
# Now start the process that goes through that list and
# parts users from rooms (if it isn't already running)
self._start_user_parting()
# Reject all pending invites for the user, so that the user doesn't show up in the
# "invited" section of rooms' members list.
await self._reject_pending_invites_for_user(user_id)
# Remove all information on the user from the account_validity table.
if self._account_validity_enabled:
await self.store.delete_account_validity_for_user(user_id)
# Mark the user as deactivated.
await self.store.set_user_deactivated_status(user_id, True)
return identity_server_supports_unbinding
async def _reject_pending_invites_for_user(self, user_id):
"""Reject pending invites addressed to a given user ID.
Args:
user_id (str): The user ID to reject pending invites for.
"""
user = UserID.from_string(user_id)
pending_invites = await self.store.get_invited_rooms_for_local_user(user_id)
for room in pending_invites:
try:
await self._room_member_handler.update_membership(
create_requester(user),
user,
room.room_id,
"leave",
ratelimit=False,
require_consent=False,
)
logger.info(
"Rejected invite for deactivated user %r in room %r",
user_id,
room.room_id,
)
except Exception:
logger.exception(
"Failed to reject invite for user %r in room %r:"
" ignoring and continuing",
user_id,
room.room_id,
)
def _start_user_parting(self):
"""
Start the process that goes through the table of users
pending deactivation, if it isn't already running.
Returns:
None
"""
if not self._user_parter_running:
run_as_background_process("user_parter_loop", self._user_parter_loop)
async def _user_parter_loop(self):
"""Loop that parts deactivated users from rooms
Returns:
None
"""
self._user_parter_running = True
logger.info("Starting user parter")
try:
while True:
user_id = await self.store.get_user_pending_deactivation()
if user_id is None:
break
logger.info("User parter parting %r", user_id)
await self._part_user(user_id)
await self.store.del_user_pending_deactivation(user_id)
logger.info("User parter finished parting %r", user_id)
logger.info("User parter finished: stopping")
finally:
self._user_parter_running = False
async def _part_user(self, user_id):
"""Causes the given user_id to leave all the rooms they're joined to
Returns:
None
"""
user = UserID.from_string(user_id)
rooms_for_user = await self.store.get_rooms_for_user(user_id)
for room_id in rooms_for_user:
logger.info("User parter parting %r from %r", user_id, room_id)
try:
await self._room_member_handler.update_membership(
create_requester(user),
user,
room_id,
"leave",
ratelimit=False,
require_consent=False,
)
except Exception:
logger.exception(
"Failed to part user %r from room %r: ignoring and continuing",
user_id,
room_id,
)
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