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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.
import six
from unpaddedbase64 import encode_base64
from twisted.internet import defer
from synapse.crypto.event_signing import compute_event_reference_hash
from synapse.util.caches.descriptors import cached, cachedList
from ._base import SQLBaseStore
# 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 = six.moves.builtins.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[unicode, bytes] 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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