112 lines
3.3 KiB
Python
112 lines
3.3 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket 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 six
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from unpaddedbase64 import encode_base64
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from twisted.internet import defer
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from synapse.crypto.event_signing import compute_event_reference_hash
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from synapse.util.caches.descriptors import cached, cachedList
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from ._base import SQLBaseStore
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# py2 sqlite has buffer hardcoded as only binary type, so we must use it,
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# despite being deprecated and removed in favor of memoryview
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if six.PY2:
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db_binary_type = buffer
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else:
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db_binary_type = memoryview
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class SignatureWorkerStore(SQLBaseStore):
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@cached()
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def get_event_reference_hash(self, event_id):
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# This is a dummy function to allow get_event_reference_hashes
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# to use its cache
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raise NotImplementedError()
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@cachedList(cached_method_name="get_event_reference_hash",
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list_name="event_ids", num_args=1)
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def get_event_reference_hashes(self, event_ids):
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def f(txn):
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return {
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event_id: self._get_event_reference_hashes_txn(txn, event_id)
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for event_id in event_ids
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}
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return self.runInteraction(
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"get_event_reference_hashes",
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f
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)
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@defer.inlineCallbacks
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def add_event_hashes(self, event_ids):
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hashes = yield self.get_event_reference_hashes(
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event_ids
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)
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hashes = {
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e_id: {
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k: encode_base64(v) for k, v in h.items()
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if k == "sha256"
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}
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for e_id, h in hashes.items()
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}
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defer.returnValue(list(hashes.items()))
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def _get_event_reference_hashes_txn(self, txn, event_id):
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"""Get all the hashes for a given PDU.
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Args:
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txn (cursor):
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event_id (str): Id for the Event.
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Returns:
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A dict[unicode, bytes] of algorithm -> hash.
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"""
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query = (
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"SELECT algorithm, hash"
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" FROM event_reference_hashes"
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" WHERE event_id = ?"
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)
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txn.execute(query, (event_id, ))
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return {k: v for k, v in txn}
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class SignatureStore(SignatureWorkerStore):
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"""Persistence for event signatures and hashes"""
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def _store_event_reference_hashes_txn(self, txn, events):
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"""Store a hash for a PDU
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Args:
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txn (cursor):
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events (list): list of Events.
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"""
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vals = []
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for event in events:
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ref_alg, ref_hash_bytes = compute_event_reference_hash(event)
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vals.append({
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"event_id": event.event_id,
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"algorithm": ref_alg,
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"hash": db_binary_type(ref_hash_bytes),
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})
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self._simple_insert_many_txn(
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txn,
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table="event_reference_hashes",
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values=vals,
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)
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