|
- # 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"""
|