famedlysdk/lib/encryption/utils/session_key.dart
2020-09-21 10:24:15 +02:00

123 lines
3.9 KiB
Dart

/*
* Famedly Matrix SDK
* Copyright (C) 2019, 2020 Famedly GmbH
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
import 'dart:convert';
import 'package:olm/olm.dart' as olm;
import '../../famedlysdk.dart';
import '../../src/database/database.dart' show DbInboundGroupSession;
import '../../src/utils/logs.dart';
class SessionKey {
Map<String, dynamic> content;
Map<String, String> indexes;
olm.InboundGroupSession inboundGroupSession;
final String key;
List<String> get forwardingCurve25519KeyChain =>
(content['forwarding_curve25519_key_chain'] != null
? List<String>.from(content['forwarding_curve25519_key_chain'])
: null) ??
<String>[];
Map<String, String> senderClaimedKeys;
String senderKey;
bool get isValid => inboundGroupSession != null;
String roomId;
String sessionId;
SessionKey(
{this.content,
this.inboundGroupSession,
this.key,
this.indexes,
this.roomId,
this.sessionId,
String senderKey,
Map<String, String> senderClaimedKeys}) {
_setSenderKey(senderKey);
_setSenderClaimedKeys(senderClaimedKeys);
}
SessionKey.fromDb(DbInboundGroupSession dbEntry, String key) : key = key {
final parsedContent = Event.getMapFromPayload(dbEntry.content);
final parsedIndexes = Event.getMapFromPayload(dbEntry.indexes);
final parsedSenderClaimedKeys =
Event.getMapFromPayload(dbEntry.senderClaimedKeys);
content =
parsedContent != null ? Map<String, dynamic>.from(parsedContent) : null;
// we need to try...catch as the map used to be <String, int> and that will throw an error.
try {
indexes = parsedIndexes != null
? Map<String, String>.from(parsedIndexes)
: <String, String>{};
} catch (e) {
indexes = <String, String>{};
}
roomId = dbEntry.roomId;
sessionId = dbEntry.sessionId;
_setSenderKey(dbEntry.senderKey);
_setSenderClaimedKeys(Map<String, String>.from(parsedSenderClaimedKeys));
inboundGroupSession = olm.InboundGroupSession();
try {
inboundGroupSession.unpickle(key, dbEntry.pickle);
} catch (e, s) {
dispose();
Logs.error(
'[LibOlm] Unable to unpickle inboundGroupSession: ' + e.toString(),
s);
}
}
void _setSenderKey(String key) {
senderKey = key ?? content['sender_key'] ?? '';
}
void _setSenderClaimedKeys(Map<String, String> keys) {
senderClaimedKeys = (keys != null && keys.isNotEmpty)
? keys
: (content['sender_claimed_keys'] is Map
? Map<String, String>.from(content['sender_claimed_keys'])
: (content['sender_claimed_ed25519_key'] is String
? <String, String>{
'ed25519': content['sender_claimed_ed25519_key']
}
: <String, String>{}));
}
Map<String, dynamic> toJson() {
final data = <String, dynamic>{};
if (content != null) {
data['content'] = content;
}
if (indexes != null) {
data['indexes'] = indexes;
}
data['inboundGroupSession'] = inboundGroupSession.pickle(key);
return data;
}
void dispose() {
inboundGroupSession?.free();
inboundGroupSession = null;
}
@override
String toString() => json.encode(toJson());
}