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# 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 typing import Collection, Dict, List, Tuple
from unpaddedbase64 import encode_base64
from synapse.crypto.event_signing import compute_event_reference_hash
from synapse.storage.databases.main.events_worker import (
EventRedactBehaviour,
EventsWorkerStore,
)
from synapse.util.caches.descriptors import cached, cachedList
class SignatureWorkerStore(EventsWorkerStore):
@cached()
def get_event_reference_hash(self, event_id: str) -> Dict[str, Dict[str, bytes]]:
# 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
)
async def get_event_reference_hashes(
self, event_ids: Collection[str]
) -> Dict[str, Dict[str, bytes]]:
"""Get all hashes for given events.
Args:
event_ids: The event IDs to get hashes for.
Returns:
A mapping of event ID to a mapping of algorithm to hash.
Returns an empty dict for a given event id if that event is unknown.
"""
events = await self.get_events(
event_ids,
redact_behaviour=EventRedactBehaviour.AS_IS,
allow_rejected=True,
)
hashes: Dict[str, Dict[str, bytes]] = {}
for event_id in event_ids:
event = events.get(event_id)
if event is None:
hashes[event_id] = {}
else:
ref_alg, ref_hash_bytes = compute_event_reference_hash(event)
hashes[event_id] = {ref_alg: ref_hash_bytes}
return hashes
async def add_event_hashes(
self, event_ids: Collection[str]
) -> List[Tuple[str, Dict[str, str]]]:
"""
Args:
event_ids: The event IDs
Returns:
A list of tuples of event ID and a mapping of algorithm to base-64 encoded hash.
"""
hashes = await self.get_event_reference_hashes(event_ids)
encoded_hashes = {
e_id: {k: encode_base64(v) for k, v in h.items() if k == "sha256"}
for e_id, h in hashes.items()
}
return list(encoded_hashes.items())
class SignatureStore(SignatureWorkerStore):
"""Persistence for event signatures and hashes"""
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