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# -*- coding: utf-8 -*-
# Copyright 2014 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 _base import SQLBaseStore
from twisted.internet import defer
class SignatureStore(SQLBaseStore):
"""Persistence for PDU signatures and hashes"""
def _get_pdu_hashes_txn(self, txn, pdu_id, origin):
"""Get all the hashes for a given PDU.
Args:
txn (cursor):
pdu_id (str): Id for the PDU.
origin (str): origin of the PDU.
Returns:
A dict of algorithm -> hash.
"""
query = (
"SELECT algorithm, hash"
" FROM pdu_hashes"
" WHERE pdu_id = ? and origin = ?"
)
txn.execute(query, (pdu_id, origin))
return dict(txn.fetchall())
def _store_pdu_hash_txn(self, txn, pdu_id, origin, algorithm, hash_bytes):
"""Store a hash for a PDU
Args:
txn (cursor):
pdu_id (str): Id for the PDU.
origin (str): origin of the PDU.
algorithm (str): Hashing algorithm.
hash_bytes (bytes): Hash function output bytes.
"""
self._simple_insert_txn(txn, "pdu_hashes", {
"pdu_id": pdu_id,
"origin": origin,
"algorithm": algorithm,
"hash": buffer(hash_bytes),
})
def _get_pdu_origin_signatures_txn(self, txn, pdu_id, origin):
"""Get all the signatures for a given PDU.
Args:
txn (cursor):
pdu_id (str): Id for the PDU.
origin (str): origin of the PDU.
Returns:
A dict of key_id -> signature_bytes.
"""
query = (
"SELECT key_id, signature"
" FROM pdu_origin_signatures"
" WHERE pdu_id = ? and origin = ?"
)
txn.execute(query, (pdu_id, origin))
return dict(txn.fetchall())
def _store_pdu_origin_signature_txn(self, txn, pdu_id, origin, key_id,
signature_bytes):
"""Store a signature from the origin server for a PDU.
Args:
txn (cursor):
pdu_id (str): Id for the PDU.
origin (str): origin of the PDU.
key_id (str): Id for the signing key.
signature (bytes): The signature.
"""
self._simple_insert_txn(txn, "pdu_origin_signatures", {
"pdu_id": pdu_id,
"origin": origin,
"key_id": key_id,
"signature": buffer(signature_bytes),
})
def _get_prev_pdu_hashes_txn(self, txn, pdu_id, origin):
"""Get all the hashes for previous PDUs of a PDU
Args:
txn (cursor):
pdu_id (str): Id of the PDU.
origin (str): Origin of the PDU.
Returns:
dict of (pdu_id, origin) -> dict of algorithm -> hash_bytes.
"""
query = (
"SELECT prev_pdu_id, prev_origin, algorithm, hash"
" FROM pdu_edge_hashes"
" WHERE pdu_id = ? and origin = ?"
)
txn.execute(query, (pdu_id, origin))
results = {}
for prev_pdu_id, prev_origin, algorithm, hash_bytes in txn.fetchall():
hashes = results.setdefault((prev_pdu_id, prev_origin), {})
hashes[algorithm] = hash_bytes
return results
def _store_prev_pdu_hash_txn(self, txn, pdu_id, origin, prev_pdu_id,
prev_origin, algorithm, hash_bytes):
self._simple_insert_txn(txn, "pdu_edge_hashes", {
"pdu_id": pdu_id,
"origin": origin,
"prev_pdu_id": prev_pdu_id,
"prev_origin": prev_origin,
"algorithm": algorithm,
"hash": buffer(hash_bytes),
})
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