Line data    Source code

       1             : /*
       2             :  *   Famedly Matrix SDK
       3             :  *   Copyright (C) 2019, 2020, 2021 Famedly GmbH
       4             :  *
       5             :  *   This program is free software: you can redistribute it and/or modify
       6             :  *   it under the terms of the GNU Affero General Public License as
       7             :  *   published by the Free Software Foundation, either version 3 of the
       8             :  *   License, or (at your option) any later version.
       9             :  *
      10             :  *   This program is distributed in the hope that it will be useful,
      11             :  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
      12             :  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
      13             :  *   GNU Affero General Public License for more details.
      14             :  *
      15             :  *   You should have received a copy of the GNU Affero General Public License
      16             :  *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
      17             :  */
      18             : 
      19             : import 'dart:convert';
      20             : 
      21             : import 'package:olm/olm.dart' as olm;
      22             : 
      23             : import 'package:matrix/matrix.dart';
      24             : 
      25             : class OutboundGroupSession {
      26             :   /// The devices is a map from user id to device id to if the device is blocked.
      27             :   /// This way we can easily know if a new user is added, leaves, a new devices is added, and,
      28             :   /// very importantly, if we block a device. These are all important for determining if/when
      29             :   /// an outbound session needs to be rotated.
      30             :   Map<String, Map<String, bool>> devices = {};
      31             :   // Default to a date, that would get this session rotated in any case to make handling easier
      32             :   DateTime creationTime = DateTime.fromMillisecondsSinceEpoch(0);
      33             :   olm.OutboundGroupSession? outboundGroupSession;
      34           6 :   int? get sentMessages => outboundGroupSession?.message_index();
      35           6 :   bool get isValid => outboundGroupSession != null;
      36             :   final String key;
      37             : 
      38           4 :   OutboundGroupSession(
      39             :       {required this.devices,
      40             :       required this.creationTime,
      41             :       required this.outboundGroupSession,
      42             :       required this.key});
      43             : 
      44           2 :   OutboundGroupSession.fromJson(Map<String, dynamic> dbEntry, this.key) {
      45             :     try {
      46           7 :       for (final entry in json.decode(dbEntry['device_ids']).entries) {
      47           5 :         devices[entry.key] = Map<String, bool>.from(entry.value);
      48             :       }
      49             :     } catch (e) {
      50             :       // devices is bad (old data), so just not use this session
      51           0 :       Logs().i(
      52           0 :           '[OutboundGroupSession] Session in database is old, not using it. $e');
      53             :       return;
      54             :     }
      55           4 :     outboundGroupSession = olm.OutboundGroupSession();
      56             :     try {
      57           8 :       outboundGroupSession!.unpickle(key, dbEntry['pickle']);
      58           1 :       creationTime =
      59           2 :           DateTime.fromMillisecondsSinceEpoch(dbEntry['creation_time']);
      60             :     } catch (e, s) {
      61           1 :       dispose();
      62           2 :       Logs().e('[LibOlm] Unable to unpickle outboundGroupSession', e, s);
      63             :     }
      64             :   }
      65             : 
      66           5 :   void dispose() {
      67          10 :     outboundGroupSession?.free();
      68           5 :     outboundGroupSession = null;
      69             :   }
      70             : }