107 lines
3.6 KiB
Python
107 lines
3.6 KiB
Python
# 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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from typing import Dict, Iterable
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from synapse.storage.database import LoggingTransaction
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from synapse.storage.databases.main import CacheInvalidationWorkerStore
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from synapse.util.caches.descriptors import cached, cachedList
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class UserErasureWorkerStore(CacheInvalidationWorkerStore):
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@cached()
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async def is_user_erased(self, user_id: str) -> bool:
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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: full user id to check
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Returns:
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True if the user has requested erasure
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"""
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result = await self.db_pool.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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)
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return bool(result)
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@cachedList(cached_method_name="is_user_erased", list_name="user_ids")
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async def are_users_erased(self, user_ids: Iterable[str]) -> Dict[str, bool]:
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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: full user ids to check
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Returns:
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for each user, whether the user has requested erasure.
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"""
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rows = await self.db_pool.simple_select_many_batch(
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table="erased_users",
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column="user_id",
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iterable=user_ids,
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retcols=("user_id",),
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desc="are_users_erased",
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)
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erased_users = {row["user_id"] for row in rows}
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return {u: u in erased_users for u in user_ids}
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class UserErasureStore(UserErasureWorkerStore):
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async def mark_user_erased(self, user_id: str) -> None:
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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: full user_id to be erased
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"""
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def f(txn: LoggingTransaction) -> None:
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# first check if they are already in the list
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txn.execute("SELECT 1 FROM erased_users WHERE user_id = ?", (user_id,))
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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("INSERT INTO erased_users (user_id) VALUES (?)", (user_id,))
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self._invalidate_cache_and_stream(txn, self.is_user_erased, (user_id,))
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await self.db_pool.runInteraction("mark_user_erased", f)
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async def mark_user_not_erased(self, user_id: str) -> None:
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"""Indicate that user_id is no longer erased.
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Args:
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user_id: full user_id to be un-erased
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"""
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def f(txn: LoggingTransaction) -> None:
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# first check if they are already in the list
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txn.execute("SELECT 1 FROM erased_users WHERE user_id = ?", (user_id,))
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if not txn.fetchone():
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return
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# They are there, delete them.
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self.db_pool.simple_delete_one_txn(
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txn, "erased_users", keyvalues={"user_id": user_id}
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)
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self._invalidate_cache_and_stream(txn, self.is_user_erased, (user_id,))
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await self.db_pool.runInteraction("mark_user_not_erased", f)
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