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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
from _base import SQLBaseStore
from unpaddedbase64 import encode_base64
from synapse.crypto.event_signing import compute_event_reference_hash
class SignatureStore(SQLBaseStore):
"""Persistence for event signatures and hashes"""
def get_event_reference_hashes(self, event_ids):
def f(txn):
return [
self._get_event_reference_hashes_txn(txn, ev)
for ev 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 = [
{
k: encode_base64(v) for k, v in h.items()
if k == "sha256"
}
for h in hashes
]
defer.returnValue(zip(event_ids, hashes))
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.fetchall()}
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": buffer(ref_hash_bytes),
})
self._simple_insert_many_txn(
txn,
table="event_reference_hashes",
values=vals,
)
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