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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 cachedList, cached
- 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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