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# -*- coding: utf-8 -*-
# Copyright 2014, 2015 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 twisted.internet import defer
from _base import SQLBaseStore
from syutil.base64util import encode_base64
class SignatureStore(SQLBaseStore):
"""Persistence for event signatures and hashes"""
def _get_event_content_hashes_txn(self, txn, event_id):
"""Get all the hashes for a given Event.
Args:
txn (cursor):
event_id (str): Id for the Event.
Returns:
A dict of algorithm -> hash.
"""
query = (
"SELECT algorithm, hash"
" FROM event_content_hashes"
" WHERE event_id = ?"
)
txn.execute(query, (event_id, ))
return dict(txn.fetchall())
def _store_event_content_hash_txn(self, txn, event_id, algorithm,
hash_bytes):
"""Store a hash for a Event
Args:
txn (cursor):
event_id (str): Id for the Event.
algorithm (str): Hashing algorithm.
hash_bytes (bytes): Hash function output bytes.
"""
self._simple_insert_txn(
txn,
"event_content_hashes",
{
"event_id": event_id,
"algorithm": algorithm,
"hash": buffer(hash_bytes),
},
)
def get_event_reference_hashes(self, event_ids):
def f(txn):
return [
self._get_event_reference_hashes_txn(txn, ev)
for ev in event_ids
]
return self.runInteraction(
"get_event_reference_hashes",
f
)
@defer.inlineCallbacks
def add_event_hashes(self, event_ids):
hashes = yield self.get_event_reference_hashes(
event_ids
)
hashes = [
{
k: encode_base64(v) for k, v in h.items()
if k == "sha256"
}
for h in hashes
]
defer.returnValue(zip(event_ids, hashes))
def _get_event_reference_hashes_txn(self, txn, event_id):
"""Get all the hashes for a given PDU.
Args:
txn (cursor):
event_id (str): Id for the Event.
Returns:
A dict of algorithm -> hash.
"""
query = (
"SELECT algorithm, hash"
" FROM event_reference_hashes"
" WHERE event_id = ?"
)
txn.execute(query, (event_id, ))
return dict(txn.fetchall())
def _store_event_reference_hash_txn(self, txn, event_id, algorithm,
hash_bytes):
"""Store a hash for a PDU
Args:
txn (cursor):
event_id (str): Id for the Event.
algorithm (str): Hashing algorithm.
hash_bytes (bytes): Hash function output bytes.
"""
self._simple_insert_txn(
txn,
"event_reference_hashes",
{
"event_id": event_id,
"algorithm": algorithm,
"hash": buffer(hash_bytes),
},
)
def _get_event_signatures_txn(self, txn, event_id):
"""Get all the signatures for a given PDU.
Args:
txn (cursor):
event_id (str): Id for the Event.
Returns:
A dict of sig name -> dict(key_id -> signature_bytes)
"""
query = (
"SELECT signature_name, key_id, signature"
" FROM event_signatures"
" WHERE event_id = ? "
)
txn.execute(query, (event_id, ))
rows = txn.fetchall()
res = {}
for name, key, sig in rows:
res.setdefault(name, {})[key] = sig
return res
def _store_event_signature_txn(self, txn, event_id, signature_name, key_id,
signature_bytes):
"""Store a signature from the origin server for a PDU.
Args:
txn (cursor):
event_id (str): Id for the Event.
origin (str): origin of the Event.
key_id (str): Id for the signing key.
signature (bytes): The signature.
"""
self._simple_insert_txn(
txn,
"event_signatures",
{
"event_id": event_id,
"signature_name": signature_name,
"key_id": key_id,
"signature": buffer(signature_bytes),
},
)
def _get_prev_event_hashes_txn(self, txn, event_id):
"""Get all the hashes for previous PDUs of a PDU
Args:
txn (cursor):
event_id (str): Id for the Event.
Returns:
dict of (pdu_id, origin) -> dict of algorithm -> hash_bytes.
"""
query = (
"SELECT prev_event_id, algorithm, hash"
" FROM event_edge_hashes"
" WHERE event_id = ?"
)
txn.execute(query, (event_id, ))
results = {}
for prev_event_id, algorithm, hash_bytes in txn.fetchall():
hashes = results.setdefault(prev_event_id, {})
hashes[algorithm] = hash_bytes
return results
def _store_prev_event_hash_txn(self, txn, event_id, prev_event_id,
algorithm, hash_bytes):
self._simple_insert_txn(
txn,
"event_edge_hashes",
{
"event_id": event_id,
"prev_event_id": prev_event_id,
"algorithm": algorithm,
"hash": buffer(hash_bytes),
},
)
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