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# -*- coding: utf-8 -*-
# Copyright 2018 New Vector Ltd
#
# 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 operator
from twisted.internet import defer
from synapse.storage._base import SQLBaseStore
from synapse.util.caches.descriptors import cached, cachedList
class UserErasureWorkerStore(SQLBaseStore):
@cached()
def is_user_erased(self, user_id):
"""
Check if the given user id has requested erasure
Args:
user_id (str): full user id to check
Returns:
Deferred[bool]: True if the user has requested erasure
"""
return self._simple_select_onecol(
table="erased_users",
keyvalues={"user_id": user_id},
retcol="1",
desc="is_user_erased",
).addCallback(operator.truth)
@cachedList(
cached_method_name="is_user_erased",
list_name="user_ids",
inlineCallbacks=True,
)
def are_users_erased(self, user_ids):
"""
Checks which users in a list have requested erasure
Args:
user_ids (iterable[str]): full user id to check
Returns:
Deferred[dict[str, bool]]:
for each user, whether the user has requested erasure.
"""
# this serves the dual purpose of (a) making sure we can do len and
# iterate it multiple times, and (b) avoiding duplicates.
user_ids = tuple(set(user_ids))
def _get_erased_users(txn):
txn.execute(
"SELECT user_id FROM erased_users WHERE user_id IN (%s)" % (
",".join("?" * len(user_ids))
),
user_ids,
)
return set(r[0] for r in txn)
erased_users = yield self.runInteraction(
"are_users_erased", _get_erased_users,
)
res = dict((u, u in erased_users) for u in user_ids)
defer.returnValue(res)
class UserErasureStore(UserErasureWorkerStore):
def mark_user_erased(self, user_id):
"""Indicate that user_id wishes their message history to be erased.
Args:
user_id (str): full user_id to be erased
"""
def f(txn):
# first check if they are already in the list
txn.execute(
"SELECT 1 FROM erased_users WHERE user_id = ?",
(user_id, )
)
if txn.fetchone():
return
# they are not already there: do the insert.
txn.execute(
"INSERT INTO erased_users (user_id) VALUES (?)",
(user_id, )
)
self._invalidate_cache_and_stream(
txn, self.is_user_erased, (user_id,)
)
return self.runInteraction("mark_user_erased", f)
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