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