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# -*- coding: utf-8 -*-
# Copyright 2015, 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 twisted.internet import defer
from canonicaljson import encode_canonical_json
import ujson as json
from ._base import SQLBaseStore
class EndToEndKeyStore(SQLBaseStore):
def set_e2e_device_keys(self, user_id, device_id, time_now, device_keys):
"""Stores device keys for a device. Returns whether there was a change
or the keys were already in the database.
"""
def _set_e2e_device_keys_txn(txn):
old_key_json = self._simple_select_one_onecol_txn(
txn,
table="e2e_device_keys_json",
keyvalues={
"user_id": user_id,
"device_id": device_id,
},
retcol="key_json",
allow_none=True,
)
new_key_json = encode_canonical_json(device_keys)
if old_key_json == new_key_json:
return False
self._simple_upsert_txn(
txn,
table="e2e_device_keys_json",
keyvalues={
"user_id": user_id,
"device_id": device_id,
},
values={
"ts_added_ms": time_now,
"key_json": new_key_json,
}
)
return True
return self.runInteraction(
"set_e2e_device_keys", _set_e2e_device_keys_txn
)
@defer.inlineCallbacks
def get_e2e_device_keys(self, query_list, include_all_devices=False):
"""Fetch a list of device keys.
Args:
query_list(list): List of pairs of user_ids and device_ids.
include_all_devices (bool): whether to include entries for devices
that don't have device keys
Returns:
Dict mapping from user-id to dict mapping from device_id to
dict containing "key_json", "device_display_name".
"""
if not query_list:
defer.returnValue({})
results = yield self.runInteraction(
"get_e2e_device_keys", self._get_e2e_device_keys_txn,
query_list, include_all_devices,
)
for user_id, device_keys in results.iteritems():
for device_id, device_info in device_keys.iteritems():
device_info["keys"] = json.loads(device_info.pop("key_json"))
defer.returnValue(results)
def _get_e2e_device_keys_txn(self, txn, query_list, include_all_devices):
query_clauses = []
query_params = []
for (user_id, device_id) in query_list:
query_clause = "user_id = ?"
query_params.append(user_id)
if device_id is not None:
query_clause += " AND device_id = ?"
query_params.append(device_id)
query_clauses.append(query_clause)
sql = (
"SELECT user_id, device_id, "
" d.display_name AS device_display_name, "
" k.key_json"
" FROM devices d"
" %s JOIN e2e_device_keys_json k USING (user_id, device_id)"
" WHERE %s"
) % (
"LEFT" if include_all_devices else "INNER",
" OR ".join("(" + q + ")" for q in query_clauses)
)
txn.execute(sql, query_params)
rows = self.cursor_to_dict(txn)
result = {}
for row in rows:
result.setdefault(row["user_id"], {})[row["device_id"]] = row
return result
def add_e2e_one_time_keys(self, user_id, device_id, time_now, key_list):
def _add_e2e_one_time_keys(txn):
for (algorithm, key_id, json_bytes) in key_list:
self._simple_upsert_txn(
txn, table="e2e_one_time_keys_json",
keyvalues={
"user_id": user_id,
"device_id": device_id,
"algorithm": algorithm,
"key_id": key_id,
},
values={
"ts_added_ms": time_now,
"key_json": json_bytes,
}
)
return self.runInteraction(
"add_e2e_one_time_keys", _add_e2e_one_time_keys
)
def count_e2e_one_time_keys(self, user_id, device_id):
""" Count the number of one time keys the server has for a device
Returns:
Dict mapping from algorithm to number of keys for that algorithm.
"""
def _count_e2e_one_time_keys(txn):
sql = (
"SELECT algorithm, COUNT(key_id) FROM e2e_one_time_keys_json"
" WHERE user_id = ? AND device_id = ?"
" GROUP BY algorithm"
)
txn.execute(sql, (user_id, device_id))
result = {}
for algorithm, key_count in txn:
result[algorithm] = key_count
return result
return self.runInteraction(
"count_e2e_one_time_keys", _count_e2e_one_time_keys
)
def claim_e2e_one_time_keys(self, query_list):
"""Take a list of one time keys out of the database"""
def _claim_e2e_one_time_keys(txn):
sql = (
"SELECT key_id, key_json FROM e2e_one_time_keys_json"
" WHERE user_id = ? AND device_id = ? AND algorithm = ?"
" LIMIT 1"
)
result = {}
delete = []
for user_id, device_id, algorithm in query_list:
user_result = result.setdefault(user_id, {})
device_result = user_result.setdefault(device_id, {})
txn.execute(sql, (user_id, device_id, algorithm))
for key_id, key_json in txn:
device_result[algorithm + ":" + key_id] = key_json
delete.append((user_id, device_id, algorithm, key_id))
sql = (
"DELETE FROM e2e_one_time_keys_json"
" WHERE user_id = ? AND device_id = ? AND algorithm = ?"
" AND key_id = ?"
)
for user_id, device_id, algorithm, key_id in delete:
txn.execute(sql, (user_id, device_id, algorithm, key_id))
return result
return self.runInteraction(
"claim_e2e_one_time_keys", _claim_e2e_one_time_keys
)
@defer.inlineCallbacks
def delete_e2e_keys_by_device(self, user_id, device_id):
yield self._simple_delete(
table="e2e_device_keys_json",
keyvalues={"user_id": user_id, "device_id": device_id},
desc="delete_e2e_device_keys_by_device"
)
yield self._simple_delete(
table="e2e_one_time_keys_json",
keyvalues={"user_id": user_id, "device_id": device_id},
desc="delete_e2e_one_time_keys_by_device"
)
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