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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 Dict, Iterable, List, Tuple
from unpaddedbase64 import encode_base64
from synapse.storage._base import SQLBaseStore
from synapse.storage.types import Cursor
from synapse.util.caches.descriptors import cached, cachedList
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
)
async def get_event_reference_hashes(
self, event_ids: Iterable[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.
"""
def f(txn):
return {
event_id: self._get_event_reference_hashes_txn(txn, event_id)
for event_id in event_ids
}
return await self.db_pool.runInteraction("get_event_reference_hashes", f)
async def add_event_hashes(
self, event_ids: Iterable[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())
def _get_event_reference_hashes_txn(
self, txn: Cursor, event_id: str
) -> Dict[str, bytes]:
"""Get all the hashes for a given PDU.
Args:
txn:
event_id: Id for the Event.
Returns:
A mapping 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"""
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