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103 lines
3.2 KiB
103 lines
3.2 KiB
# -*- coding: utf-8 -*-
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# Copyright 2018 New Vector Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import operator
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from twisted.internet import defer
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from synapse.storage._base import SQLBaseStore
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from synapse.util.caches.descriptors import cached, cachedList
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class UserErasureWorkerStore(SQLBaseStore):
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@cached()
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def is_user_erased(self, user_id):
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"""
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Check if the given user id has requested erasure
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Args:
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user_id (str): full user id to check
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Returns:
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Deferred[bool]: True if the user has requested erasure
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"""
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return self._simple_select_onecol(
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table="erased_users",
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keyvalues={"user_id": user_id},
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retcol="1",
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desc="is_user_erased",
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).addCallback(operator.truth)
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@cachedList(
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cached_method_name="is_user_erased",
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list_name="user_ids",
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inlineCallbacks=True,
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)
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def are_users_erased(self, user_ids):
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"""
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Checks which users in a list have requested erasure
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Args:
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user_ids (iterable[str]): full user id to check
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Returns:
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Deferred[dict[str, bool]]:
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for each user, whether the user has requested erasure.
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"""
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# this serves the dual purpose of (a) making sure we can do len and
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# iterate it multiple times, and (b) avoiding duplicates.
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user_ids = tuple(set(user_ids))
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def _get_erased_users(txn):
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txn.execute(
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"SELECT user_id FROM erased_users WHERE user_id IN (%s)" % (
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",".join("?" * len(user_ids))
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),
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user_ids,
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)
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return set(r[0] for r in txn)
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erased_users = yield self.runInteraction(
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"are_users_erased", _get_erased_users,
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)
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res = dict((u, u in erased_users) for u in user_ids)
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defer.returnValue(res)
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class UserErasureStore(UserErasureWorkerStore):
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def mark_user_erased(self, user_id):
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"""Indicate that user_id wishes their message history to be erased.
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Args:
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user_id (str): full user_id to be erased
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"""
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def f(txn):
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# first check if they are already in the list
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txn.execute(
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"SELECT 1 FROM erased_users WHERE user_id = ?",
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(user_id, )
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)
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if txn.fetchone():
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return
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# they are not already there: do the insert.
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txn.execute(
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"INSERT INTO erased_users (user_id) VALUES (?)",
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(user_id, )
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)
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self._invalidate_cache_and_stream(
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txn, self.is_user_erased, (user_id,)
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)
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return self.runInteraction("mark_user_erased", f)
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