88 lines
2.9 KiB
Python
88 lines
2.9 KiB
Python
# Copyright 2014-2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from typing import Collection, Dict, List, Tuple
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from unpaddedbase64 import encode_base64
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from synapse.crypto.event_signing import compute_event_reference_hash
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from synapse.storage.databases.main.events_worker import (
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EventRedactBehaviour,
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EventsWorkerStore,
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)
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from synapse.util.caches.descriptors import cached, cachedList
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class SignatureWorkerStore(EventsWorkerStore):
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@cached()
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def get_event_reference_hash(self, event_id: str) -> Dict[str, Dict[str, bytes]]:
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# This is a dummy function to allow get_event_reference_hashes
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# to use its cache
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raise NotImplementedError()
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@cachedList(
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cached_method_name="get_event_reference_hash", list_name="event_ids", num_args=1
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)
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async def get_event_reference_hashes(
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self, event_ids: Collection[str]
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) -> Dict[str, Dict[str, bytes]]:
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"""Get all hashes for given events.
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Args:
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event_ids: The event IDs to get hashes for.
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Returns:
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A mapping of event ID to a mapping of algorithm to hash.
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Returns an empty dict for a given event id if that event is unknown.
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"""
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events = await self.get_events(
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event_ids,
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redact_behaviour=EventRedactBehaviour.as_is,
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allow_rejected=True,
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)
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hashes: Dict[str, Dict[str, bytes]] = {}
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for event_id in event_ids:
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event = events.get(event_id)
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if event is None:
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hashes[event_id] = {}
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else:
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ref_alg, ref_hash_bytes = compute_event_reference_hash(event)
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hashes[event_id] = {ref_alg: ref_hash_bytes}
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return hashes
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async def add_event_hashes(
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self, event_ids: Collection[str]
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) -> List[Tuple[str, Dict[str, str]]]:
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"""
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Args:
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event_ids: The event IDs
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Returns:
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A list of tuples of event ID and a mapping of algorithm to base-64 encoded hash.
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"""
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hashes = await self.get_event_reference_hashes(event_ids)
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encoded_hashes = {
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e_id: {k: encode_base64(v) for k, v in h.items() if k == "sha256"}
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for e_id, h in hashes.items()
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}
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return list(encoded_hashes.items())
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class SignatureStore(SignatureWorkerStore):
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"""Persistence for event signatures and hashes"""
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