summaryrefslogtreecommitdiff
path: root/program/lib/Roundcube/rcube.php
blob: 6582d89a346d84548b9c03525511c23ebdd3ecb8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
<?php

/*
 +-----------------------------------------------------------------------+
 | This file is part of the Roundcube Webmail client                     |
 | Copyright (C) 2008-2012, The Roundcube Dev Team                       |
 | Copyright (C) 2011-2012, Kolab Systems AG                             |
 |                                                                       |
 | Licensed under the GNU General Public License version 3 or            |
 | any later version with exceptions for skins & plugins.                |
 | See the README file for a full license statement.                     |
 |                                                                       |
 | PURPOSE:                                                              |
 |   Framework base class providing core functions and holding           |
 |   instances of all 'global' objects like db- and storage-connections  |
 +-----------------------------------------------------------------------+
 | Author: Thomas Bruederli <roundcube@gmail.com>                        |
 +-----------------------------------------------------------------------+
*/


/**
 * Base class of the Roundcube Framework
 * implemented as singleton
 *
 * @package    Framework
 * @subpackage Core
 */
class rcube
{
    const INIT_WITH_DB = 1;
    const INIT_WITH_PLUGINS = 2;

    /**
     * Singleton instace of rcube
     *
     * @var rcube
     */
    static protected $instance;

    /**
     * Stores instance of rcube_config.
     *
     * @var rcube_config
     */
    public $config;

    /**
     * Instace of database class.
     *
     * @var rcube_db
     */
    public $db;

    /**
     * Instace of Memcache class.
     *
     * @var Memcache
     */
    public $memcache;

   /**
     * Instace of rcube_session class.
     *
     * @var rcube_session
     */
    public $session;

    /**
     * Instance of rcube_smtp class.
     *
     * @var rcube_smtp
     */
    public $smtp;

    /**
     * Instance of rcube_storage class.
     *
     * @var rcube_storage
     */
    public $storage;

    /**
     * Instance of rcube_output class.
     *
     * @var rcube_output
     */
    public $output;

    /**
     * Instance of rcube_plugin_api.
     *
     * @var rcube_plugin_api
     */
    public $plugins;


    /* private/protected vars */
    protected $texts;
    protected $caches = array();
    protected $shutdown_functions = array();


    /**
     * This implements the 'singleton' design pattern
     *
     * @param integer Options to initialize with this instance. See rcube::INIT_WITH_* constants
     * @param string Environment name to run (e.g. live, dev, test)
     *
     * @return rcube The one and only instance
     */
    static function get_instance($mode = 0, $env = '')
    {
        if (!self::$instance) {
            self::$instance = new rcube($env);
            self::$instance->init($mode);
        }

        return self::$instance;
    }


    /**
     * Private constructor
     */
    protected function __construct($env = '')
    {
        // load configuration
        $this->config  = new rcube_config($env);
        $this->plugins = new rcube_dummy_plugin_api;

        register_shutdown_function(array($this, 'shutdown'));
    }


    /**
     * Initial startup function
     */
    protected function init($mode = 0)
    {
        // initialize syslog
        if ($this->config->get('log_driver') == 'syslog') {
            $syslog_id       = $this->config->get('syslog_id', 'roundcube');
            $syslog_facility = $this->config->get('syslog_facility', LOG_USER);
            openlog($syslog_id, LOG_ODELAY, $syslog_facility);
        }

        // connect to database
        if ($mode & self::INIT_WITH_DB) {
            $this->get_dbh();
        }

        // create plugin API and load plugins
        if ($mode & self::INIT_WITH_PLUGINS) {
            $this->plugins = rcube_plugin_api::get_instance();
        }
    }


    /**
     * Get the current database connection
     *
     * @return rcube_db Database object
     */
    public function get_dbh()
    {
        if (!$this->db) {
            $config_all = $this->config->all();
            $this->db = rcube_db::factory($config_all['db_dsnw'], $config_all['db_dsnr'], $config_all['db_persistent']);
            $this->db->set_debug((bool)$config_all['sql_debug']);
        }

        return $this->db;
    }


    /**
     * Get global handle for memcache access
     *
     * @return object Memcache
     */
    public function get_memcache()
    {
        if (!isset($this->memcache)) {
            // no memcache support in PHP
            if (!class_exists('Memcache')) {
                $this->memcache = false;
                return false;
            }

            $this->memcache     = new Memcache;
            $this->mc_available = 0;

            // add all configured hosts to pool
            $pconnect = $this->config->get('memcache_pconnect', true);
            foreach ($this->config->get('memcache_hosts', array()) as $host) {
                if (substr($host, 0, 7) != 'unix://') {
                    list($host, $port) = explode(':', $host);
                    if (!$port) $port = 11211;
                }
                else {
                    $port = 0;
                }

                $this->mc_available += intval($this->memcache->addServer(
                    $host, $port, $pconnect, 1, 1, 15, false, array($this, 'memcache_failure')));
            }

            // test connection and failover (will result in $this->mc_available == 0 on complete failure)
            $this->memcache->increment('__CONNECTIONTEST__', 1);  // NOP if key doesn't exist

            if (!$this->mc_available) {
                $this->memcache = false;
            }
        }

        return $this->memcache;
    }


    /**
     * Callback for memcache failure
     */
    public function memcache_failure($host, $port)
    {
        static $seen = array();

        // only report once
        if (!$seen["$host:$port"]++) {
            $this->mc_available--;
            self::raise_error(array(
                'code' => 604, 'type' => 'db',
                'line' => __LINE__, 'file' => __FILE__,
                'message' => "Memcache failure on host $host:$port"),
                true, false);
        }
    }


    /**
     * Initialize and get cache object
     *
     * @param string $name   Cache identifier
     * @param string $type   Cache type ('db', 'apc' or 'memcache')
     * @param string $ttl    Expiration time for cache items
     * @param bool   $packed Enables/disables data serialization
     *
     * @return rcube_cache Cache object
     */
    public function get_cache($name, $type='db', $ttl=0, $packed=true)
    {
        if (!isset($this->caches[$name]) && ($userid = $this->get_user_id())) {
            $this->caches[$name] = new rcube_cache($type, $userid, $name, $ttl, $packed);
        }

        return $this->caches[$name];
    }


    /**
     * Initialize and get shared cache object
     *
     * @param string $name   Cache identifier
     * @param bool   $packed Enables/disables data serialization
     *
     * @return rcube_cache_shared Cache object
     */
    public function get_cache_shared($name, $packed=true)
    {
        $shared_name = "shared_$name";

        if (!array_key_exists($shared_name, $this->caches)) {
            $opt  = strtolower($name) . '_cache';
            $type = $this->config->get($opt);
            $ttl  = $this->config->get($opt . '_ttl');

            if (!$type) {
                // cache is disabled
                return $this->caches[$shared_name] = null;
            }

            if ($ttl === null) {
                $ttl = $this->config->get('shared_cache_ttl', '10d');
            }

            $this->caches[$shared_name] = new rcube_cache_shared($type, $name, $ttl, $packed);
        }

        return $this->caches[$shared_name];
    }


    /**
     * Create SMTP object and connect to server
     *
     * @param boolean True if connection should be established
     */
    public function smtp_init($connect = false)
    {
        $this->smtp = new rcube_smtp();

        if ($connect) {
            $this->smtp->connect();
        }
    }


    /**
     * Initialize and get storage object
     *
     * @return rcube_storage Storage object
     */
    public function get_storage()
    {
        // already initialized
        if (!is_object($this->storage)) {
            $this->storage_init();
        }

        return $this->storage;
    }


    /**
     * Initialize storage object
     */
    public function storage_init()
    {
        // already initialized
        if (is_object($this->storage)) {
            return;
        }

        $driver       = $this->config->get('storage_driver', 'imap');
        $driver_class = "rcube_{$driver}";

        if (!class_exists($driver_class)) {
            self::raise_error(array(
                'code' => 700, 'type' => 'php',
                'file' => __FILE__, 'line' => __LINE__,
                'message' => "Storage driver class ($driver) not found!"),
                true, true);
        }

        // Initialize storage object
        $this->storage = new $driver_class;

        // for backward compat. (deprecated, will be removed)
        $this->imap = $this->storage;

        // enable caching of mail data
        $storage_cache  = $this->config->get("{$driver}_cache");
        $messages_cache = $this->config->get('messages_cache');
        // for backward compatybility
        if ($storage_cache === null && $messages_cache === null && $this->config->get('enable_caching')) {
            $storage_cache  = 'db';
            $messages_cache = true;
        }

        if ($storage_cache) {
            $this->storage->set_caching($storage_cache);
        }
        if ($messages_cache) {
            $this->storage->set_messages_caching(true);
        }

        // set pagesize from config
        $pagesize = $this->config->get('mail_pagesize');
        if (!$pagesize) {
            $pagesize = $this->config->get('pagesize', 50);
        }
        $this->storage->set_pagesize($pagesize);

        // set class options
        $options = array(
            'auth_type'      => $this->config->get("{$driver}_auth_type", 'check'),
            'auth_cid'       => $this->config->get("{$driver}_auth_cid"),
            'auth_pw'        => $this->config->get("{$driver}_auth_pw"),
            'debug'          => (bool) $this->config->get("{$driver}_debug"),
            'force_caps'     => (bool) $this->config->get("{$driver}_force_caps"),
            'disabled_caps'  => $this->config->get("{$driver}_disabled_caps"),
            'socket_options' => $this->config->get("{$driver}_conn_options"),
            'timeout'        => (int) $this->config->get("{$driver}_timeout"),
            'skip_deleted'   => (bool) $this->config->get('skip_deleted'),
            'driver'         => $driver,
        );

        if (!empty($_SESSION['storage_host'])) {
            $options['host']     = $_SESSION['storage_host'];
            $options['user']     = $_SESSION['username'];
            $options['port']     = $_SESSION['storage_port'];
            $options['ssl']      = $_SESSION['storage_ssl'];
            $options['password'] = $this->decrypt($_SESSION['password']);
            $_SESSION[$driver.'_host'] = $_SESSION['storage_host'];
        }

        $options = $this->plugins->exec_hook("storage_init", $options);

        // for backward compat. (deprecated, to be removed)
        $options = $this->plugins->exec_hook("imap_init", $options);

        $this->storage->set_options($options);
        $this->set_storage_prop();
    }


    /**
     * Set storage parameters.
     * This must be done AFTER connecting to the server!
     */
    protected function set_storage_prop()
    {
        $storage = $this->get_storage();

        $storage->set_charset($this->config->get('default_charset', RCUBE_CHARSET));

        if ($default_folders = $this->config->get('default_folders')) {
            $storage->set_default_folders($default_folders);
        }
        if (isset($_SESSION['mbox'])) {
            $storage->set_folder($_SESSION['mbox']);
        }
        if (isset($_SESSION['page'])) {
            $storage->set_page($_SESSION['page']);
        }
    }


    /**
     * Create session object and start the session.
     */
    public function session_init()
    {
        // session started (Installer?)
        if (session_id()) {
            return;
        }

        $sess_name   = $this->config->get('session_name');
        $sess_domain = $this->config->get('session_domain');
        $sess_path   = $this->config->get('session_path');
        $lifetime    = $this->config->get('session_lifetime', 0) * 60;
        $is_secure   = $this->config->get('use_https') || rcube_utils::https_check();

        // set session domain
        if ($sess_domain) {
            ini_set('session.cookie_domain', $sess_domain);
        }
        // set session path
        if ($sess_path) {
            ini_set('session.cookie_path', $sess_path);
        }
        // set session garbage collecting time according to session_lifetime
        if ($lifetime) {
            ini_set('session.gc_maxlifetime', $lifetime * 2);
        }

        ini_set('session.cookie_secure', $is_secure);
        ini_set('session.name', $sess_name ? $sess_name : 'roundcube_sessid');
        ini_set('session.use_cookies', 1);
        ini_set('session.use_only_cookies', 1);
        ini_set('session.cookie_httponly', 1);

        // use database for storing session data
        $this->session = new rcube_session($this->get_dbh(), $this->config);

        $this->session->register_gc_handler(array($this, 'gc'));
        $this->session->set_secret($this->config->get('des_key') . dirname($_SERVER['SCRIPT_NAME']));
        $this->session->set_ip_check($this->config->get('ip_check'));

        if ($this->config->get('session_auth_name')) {
            $this->session->set_cookiename($this->config->get('session_auth_name'));
        }

        // start PHP session (if not in CLI mode)
        if ($_SERVER['REMOTE_ADDR']) {
            $this->session->start();
        }
    }


    /**
     * Garbage collector - cache/temp cleaner
     */
    public function gc()
    {
        rcube_cache::gc();
        rcube_cache_shared::gc();
        $this->get_storage()->cache_gc();

        $this->gc_temp();
    }


    /**
     * Garbage collector function for temp files.
     * Remove temp files older than two days
     */
    public function gc_temp()
    {
        $tmp = unslashify($this->config->get('temp_dir'));

        // expire in 48 hours by default
        $temp_dir_ttl = $this->config->get('temp_dir_ttl', '48h');
        $temp_dir_ttl = get_offset_sec($temp_dir_ttl);
        if ($temp_dir_ttl < 6*3600)
            $temp_dir_ttl = 6*3600;   // 6 hours sensible lower bound.

        $expire = time() - $temp_dir_ttl;

        if ($tmp && ($dir = opendir($tmp))) {
            while (($fname = readdir($dir)) !== false) {
                if ($fname[0] == '.') {
                    continue;
                }

                if (@filemtime($tmp.'/'.$fname) < $expire) {
                    @unlink($tmp.'/'.$fname);
                }
            }

            closedir($dir);
        }
    }


    /**
     * Runs garbage collector with probability based on
     * session settings. This is intended for environments
     * without a session.
     */
    public function gc_run()
    {
        $probability = (int) ini_get('session.gc_probability');
        $divisor     = (int) ini_get('session.gc_divisor');

        if ($divisor > 0 && $probability > 0) {
            $random = mt_rand(1, $divisor);
            if ($random <= $probability) {
                $this->gc();
            }
        }
    }


    /**
     * Get localized text in the desired language
     *
     * @param mixed   $attrib  Named parameters array or label name
     * @param string  $domain  Label domain (plugin) name
     *
     * @return string Localized text
     */
    public function gettext($attrib, $domain=null)
    {
        // load localization files if not done yet
        if (empty($this->texts)) {
            $this->load_language();
        }

        // extract attributes
        if (is_string($attrib)) {
            $attrib = array('name' => $attrib);
        }

        $name = $attrib['name'] ? $attrib['name'] : '';

        // attrib contain text values: use them from now
        if (($setval = $attrib[strtolower($_SESSION['language'])]) || ($setval = $attrib['en_us'])) {
            $this->texts[$name] = $setval;
        }

        // check for text with domain
        if ($domain && ($text = $this->texts[$domain.'.'.$name])) {
        }
        // text does not exist
        else if (!($text = $this->texts[$name])) {
            return "[$name]";
        }

        // replace vars in text
        if (is_array($attrib['vars'])) {
            foreach ($attrib['vars'] as $var_key => $var_value) {
                $text = str_replace($var_key[0]!='$' ? '$'.$var_key : $var_key, $var_value, $text);
            }
        }

        // format output
        if (($attrib['uppercase'] && strtolower($attrib['uppercase'] == 'first')) || $attrib['ucfirst']) {
            return ucfirst($text);
        }
        else if ($attrib['uppercase']) {
            return mb_strtoupper($text);
        }
        else if ($attrib['lowercase']) {
            return mb_strtolower($text);
        }

        return strtr($text, array('\n' => "\n"));
    }


    /**
     * Check if the given text label exists
     *
     * @param string  $name       Label name
     * @param string  $domain     Label domain (plugin) name or '*' for all domains
     * @param string  $ref_domain Sets domain name if label is found
     *
     * @return boolean True if text exists (either in the current language or in en_US)
     */
    public function text_exists($name, $domain = null, &$ref_domain = null)
    {
        // load localization files if not done yet
        if (empty($this->texts)) {
            $this->load_language();
        }

        if (isset($this->texts[$name])) {
            $ref_domain = '';
            return true;
        }

        // any of loaded domains (plugins)
        if ($domain == '*') {
            foreach ($this->plugins->loaded_plugins() as $domain) {
                if (isset($this->texts[$domain.'.'.$name])) {
                    $ref_domain = $domain;
                    return true;
                }
            }
        }
        // specified domain
        else if ($domain) {
            $ref_domain = $domain;
            return isset($this->texts[$domain.'.'.$name]);
        }

        return false;
    }


    /**
     * Load a localization package
     *
     * @param string $lang  Language ID
     * @param array  $add   Additional text labels/messages
     * @param array  $merge Additional text labels/messages to merge
     */
    public function load_language($lang = null, $add = array(), $merge = array())
    {
        $lang = $this->language_prop(($lang ? $lang : $_SESSION['language']));

        // load localized texts
        if (empty($this->texts) || $lang != $_SESSION['language']) {
            $this->texts = array();

            // handle empty lines after closing PHP tag in localization files
            ob_start();

            // get english labels (these should be complete)
            @include(RCUBE_LOCALIZATION_DIR . 'en_US/labels.inc');
            @include(RCUBE_LOCALIZATION_DIR . 'en_US/messages.inc');

            if (is_array($labels))
                $this->texts = $labels;
            if (is_array($messages))
                $this->texts = array_merge($this->texts, $messages);

            // include user language files
            if ($lang != 'en' && $lang != 'en_US' && is_dir(RCUBE_LOCALIZATION_DIR . $lang)) {
                include_once(RCUBE_LOCALIZATION_DIR . $lang . '/labels.inc');
                include_once(RCUBE_LOCALIZATION_DIR . $lang . '/messages.inc');

                if (is_array($labels))
                    $this->texts = array_merge($this->texts, $labels);
                if (is_array($messages))
                    $this->texts = array_merge($this->texts, $messages);
            }

            ob_end_clean();

            $_SESSION['language'] = $lang;
        }

        // append additional texts (from plugin)
        if (is_array($add) && !empty($add)) {
            $this->texts += $add;
        }

        // merge additional texts (from plugin)
        if (is_array($merge) && !empty($merge)) {
            $this->texts = array_merge($this->texts, $merge);
        }
    }


    /**
     * Check the given string and return a valid language code
     *
     * @param string Language code
     *
     * @return string Valid language code
     */
    protected function language_prop($lang)
    {
        static $rcube_languages, $rcube_language_aliases;

        // user HTTP_ACCEPT_LANGUAGE if no language is specified
        if (empty($lang) || $lang == 'auto') {
            $accept_langs = explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE']);
            $lang         = $accept_langs[0];

            if (preg_match('/^([a-z]+)[_-]([a-z]+)$/i', $lang, $m)) {
                $lang = $m[1] . '_' . strtoupper($m[2]);
            }
        }

        if (empty($rcube_languages)) {
            @include(RCUBE_LOCALIZATION_DIR . 'index.inc');
        }

        // check if we have an alias for that language
        if (!isset($rcube_languages[$lang]) && isset($rcube_language_aliases[$lang])) {
            $lang = $rcube_language_aliases[$lang];
        }
        // try the first two chars
        else if (!isset($rcube_languages[$lang])) {
            $short = substr($lang, 0, 2);

            // check if we have an alias for the short language code
            if (!isset($rcube_languages[$short]) && isset($rcube_language_aliases[$short])) {
                $lang = $rcube_language_aliases[$short];
            }
            // expand 'nn' to 'nn_NN'
            else if (!isset($rcube_languages[$short])) {
                $lang = $short.'_'.strtoupper($short);
            }
        }

        if (!isset($rcube_languages[$lang]) || !is_dir(RCUBE_LOCALIZATION_DIR . $lang)) {
            $lang = 'en_US';
        }

        return $lang;
    }


    /**
     * Read directory program/localization and return a list of available languages
     *
     * @return array List of available localizations
     */
    public function list_languages()
    {
        static $sa_languages = array();

        if (!sizeof($sa_languages)) {
            @include(RCUBE_LOCALIZATION_DIR . 'index.inc');

            if ($dh = @opendir(RCUBE_LOCALIZATION_DIR)) {
                while (($name = readdir($dh)) !== false) {
                    if ($name[0] == '.' || !is_dir(RCUBE_LOCALIZATION_DIR . $name)) {
                        continue;
                    }

                    if ($label = $rcube_languages[$name]) {
                        $sa_languages[$name] = $label;
                    }
                }
                closedir($dh);
            }
        }

        return $sa_languages;
    }


    /**
     * Encrypt using 3DES
     *
     * @param string $clear clear text input
     * @param string $key encryption key to retrieve from the configuration, defaults to 'des_key'
     * @param boolean $base64 whether or not to base64_encode() the result before returning
     *
     * @return string encrypted text
     */
    public function encrypt($clear, $key = 'des_key', $base64 = true)
    {
        if (!$clear) {
            return '';
        }

        /*-
         * Add a single canary byte to the end of the clear text, which
         * will help find out how much of padding will need to be removed
         * upon decryption; see http://php.net/mcrypt_generic#68082
         */
        $clear = pack("a*H2", $clear, "80");

        if (function_exists('mcrypt_module_open') &&
            ($td = mcrypt_module_open(MCRYPT_TripleDES, "", MCRYPT_MODE_CBC, ""))
        ) {
            $iv = $this->create_iv(mcrypt_enc_get_iv_size($td));
            mcrypt_generic_init($td, $this->config->get_crypto_key($key), $iv);
            $cipher = $iv . mcrypt_generic($td, $clear);
            mcrypt_generic_deinit($td);
            mcrypt_module_close($td);
        }
        else {
            @include_once 'des.inc';

            if (function_exists('des')) {
                $des_iv_size = 8;
                $iv = $this->create_iv($des_iv_size);
                $cipher = $iv . des($this->config->get_crypto_key($key), $clear, 1, 1, $iv);
            }
            else {
                self::raise_error(array(
                    'code' => 500, 'type' => 'php',
                    'file' => __FILE__, 'line' => __LINE__,
                    'message' => "Could not perform encryption; make sure Mcrypt is installed or lib/des.inc is available"
                    ), true, true);
            }
        }

        return $base64 ? base64_encode($cipher) : $cipher;
    }


    /**
     * Decrypt 3DES-encrypted string
     *
     * @param string $cipher encrypted text
     * @param string $key encryption key to retrieve from the configuration, defaults to 'des_key'
     * @param boolean $base64 whether or not input is base64-encoded
     *
     * @return string decrypted text
     */
    public function decrypt($cipher, $key = 'des_key', $base64 = true)
    {
        if (!$cipher) {
            return '';
        }

        $cipher = $base64 ? base64_decode($cipher) : $cipher;

        if (function_exists('mcrypt_module_open') &&
            ($td = mcrypt_module_open(MCRYPT_TripleDES, "", MCRYPT_MODE_CBC, ""))
        ) {
            $iv_size = mcrypt_enc_get_iv_size($td);
            $iv = substr($cipher, 0, $iv_size);

            // session corruption? (#1485970)
            if (strlen($iv) < $iv_size) {
                return '';
            }

            $cipher = substr($cipher, $iv_size);
            mcrypt_generic_init($td, $this->config->get_crypto_key($key), $iv);
            $clear = mdecrypt_generic($td, $cipher);
            mcrypt_generic_deinit($td);
            mcrypt_module_close($td);
        }
        else {
            @include_once 'des.inc';

            if (function_exists('des')) {
                $des_iv_size = 8;
                $iv = substr($cipher, 0, $des_iv_size);
                $cipher = substr($cipher, $des_iv_size);
                $clear = des($this->config->get_crypto_key($key), $cipher, 0, 1, $iv);
            }
            else {
                self::raise_error(array(
                    'code' => 500, 'type' => 'php',
                    'file' => __FILE__, 'line' => __LINE__,
                    'message' => "Could not perform decryption; make sure Mcrypt is installed or lib/des.inc is available"
                    ), true, true);
            }
        }

        /*-
         * Trim PHP's padding and the canary byte; see note in
         * rcube::encrypt() and http://php.net/mcrypt_generic#68082
         */
        $clear = substr(rtrim($clear, "\0"), 0, -1);

        return $clear;
    }


    /**
     * Generates encryption initialization vector (IV)
     *
     * @param int Vector size
     *
     * @return string Vector string
     */
    private function create_iv($size)
    {
        // mcrypt_create_iv() can be slow when system lacks entrophy
        // we'll generate IV vector manually
        $iv = '';
        for ($i = 0; $i < $size; $i++) {
            $iv .= chr(mt_rand(0, 255));
        }

        return $iv;
    }


    /**
     * Build a valid URL to this instance of Roundcube
     *
     * @param mixed Either a string with the action or url parameters as key-value pairs
     * @return string Valid application URL
     */
    public function url($p)
    {
        // STUB: should be overloaded by the application
        return '';
    }


    /**
     * Function to be executed in script shutdown
     * Registered with register_shutdown_function()
     */
    public function shutdown()
    {
        foreach ($this->shutdown_functions as $function) {
            call_user_func($function);
        }

        // write session data as soon as possible and before
        // closing database connection, don't do this before
        // registered shutdown functions, they may need the session
        // Note: this will run registered gc handlers (ie. cache gc)
        if ($_SERVER['REMOTE_ADDR'] && is_object($this->session)) {
            $this->session->write_close();
        }

        if (is_object($this->smtp)) {
            $this->smtp->disconnect();
        }

        foreach ($this->caches as $cache) {
            if (is_object($cache)) {
                $cache->close();
            }
        }

        if (is_object($this->storage)) {
            $this->storage->close();
        }
    }


    /**
     * Registers shutdown function to be executed on shutdown.
     * The functions will be executed before destroying any
     * objects like smtp, imap, session, etc.
     *
     * @param callback Function callback
     */
    public function add_shutdown_function($function)
    {
        $this->shutdown_functions[] = $function;
    }


    /**
     * Quote a given string.
     * Shortcut function for rcube_utils::rep_specialchars_output()
     *
     * @return string HTML-quoted string
     */
    public static function Q($str, $mode = 'strict', $newlines = true)
    {
        return rcube_utils::rep_specialchars_output($str, 'html', $mode, $newlines);
    }


    /**
     * Quote a given string for javascript output.
     * Shortcut function for rcube_utils::rep_specialchars_output()
     *
     * @return string JS-quoted string
     */
    public static function JQ($str)
    {
        return rcube_utils::rep_specialchars_output($str, 'js');
    }


    /**
     * Construct shell command, execute it and return output as string.
     * Keywords {keyword} are replaced with arguments
     *
     * @param $cmd Format string with {keywords} to be replaced
     * @param $values (zero, one or more arrays can be passed)
     *
     * @return output of command. shell errors not detectable
     */
    public static function exec(/* $cmd, $values1 = array(), ... */)
    {
        $args   = func_get_args();
        $cmd    = array_shift($args);
        $values = $replacements = array();

        // merge values into one array
        foreach ($args as $arg) {
            $values += (array)$arg;
        }

        preg_match_all('/({(-?)([a-z]\w*)})/', $cmd, $matches, PREG_SET_ORDER);
        foreach ($matches as $tags) {
            list(, $tag, $option, $key) = $tags;
            $parts = array();

            if ($option) {
                foreach ((array)$values["-$key"] as $key => $value) {
                    if ($value === true || $value === false || $value === null) {
                        $parts[] = $value ? $key : "";
                    }
                    else {
                        foreach ((array)$value as $val) {
                            $parts[] = "$key " . escapeshellarg($val);
                        }
                    }
                }
            }
            else {
                foreach ((array)$values[$key] as $value) {
                    $parts[] = escapeshellarg($value);
                }
            }

            $replacements[$tag] = join(" ", $parts);
        }

        // use strtr behaviour of going through source string once
        $cmd = strtr($cmd, $replacements);

        return (string)shell_exec($cmd);
    }


    /**
     * Print or write debug messages
     *
     * @param mixed Debug message or data
     */
    public static function console()
    {
        $args = func_get_args();

        if (class_exists('rcube', false)) {
            $rcube = self::get_instance();
            $plugin = $rcube->plugins->exec_hook('console', array('args' => $args));
            if ($plugin['abort']) {
                return;
            }
           $args = $plugin['args'];
        }

        $msg = array();
        foreach ($args as $arg) {
            $msg[] = !is_string($arg) ? var_export($arg, true) : $arg;
        }

        self::write_log('console', join(";\n", $msg));
    }


    /**
     * Append a line to a logfile in the logs directory.
     * Date will be added automatically to the line.
     *
     * @param $name name of log file
     * @param line Line to append
     */
    public static function write_log($name, $line)
    {
        if (!is_string($line)) {
            $line = var_export($line, true);
        }

        $date_format = self::$instance ? self::$instance->config->get('log_date_format') : null;
        $log_driver  = self::$instance ? self::$instance->config->get('log_driver') : null;

        if (empty($date_format)) {
            $date_format = 'd-M-Y H:i:s O';
        }

        $date = date($date_format);

        // trigger logging hook
        if (is_object(self::$instance) && is_object(self::$instance->plugins)) {
            $log  = self::$instance->plugins->exec_hook('write_log', array('name' => $name, 'date' => $date, 'line' => $line));
            $name = $log['name'];
            $line = $log['line'];
            $date = $log['date'];
            if ($log['abort'])
                return true;
        }

        if ($log_driver == 'syslog') {
            $prio = $name == 'errors' ? LOG_ERR : LOG_INFO;
            syslog($prio, $line);
            return true;
        }

        // log_driver == 'file' is assumed here

        $line = sprintf("[%s]: %s\n", $date, $line);
        $log_dir = null;

        // per-user logging is activated
        if (self::$instance && self::$instance->config->get('per_user_logging', false) && self::$instance->get_user_id()) {
            $log_dir = self::$instance->get_user_log_dir();
            if (empty($log_dir))
                return false;
        }
        else if (!empty($log['dir'])) {
            $log_dir = $log['dir'];
        }
        else if (self::$instance) {
            $log_dir = self::$instance->config->get('log_dir');
        }

        if (empty($log_dir)) {
            $log_dir = RCUBE_INSTALL_PATH . 'logs';
        }

        // try to open specific log file for writing
        $logfile = $log_dir.'/'.$name;

        if ($fp = @fopen($logfile, 'a')) {
            fwrite($fp, $line);
            fflush($fp);
            fclose($fp);
            return true;
        }

        trigger_error("Error writing to log file $logfile; Please check permissions", E_USER_WARNING);
        return false;
    }


    /**
     * Throw system error (and show error page).
     *
     * @param array Named parameters
     *      - code:    Error code (required)
     *      - type:    Error type [php|db|imap|javascript] (required)
     *      - message: Error message
     *      - file:    File where error occurred
     *      - line:    Line where error occurred
     * @param boolean True to log the error
     * @param boolean Terminate script execution
     */
    public static function raise_error($arg = array(), $log = false, $terminate = false)
    {
        // handle PHP exceptions
        if (is_object($arg) && is_a($arg, 'Exception')) {
            $arg = array(
                'code' => $arg->getCode(),
                'line' => $arg->getLine(),
                'file' => $arg->getFile(),
                'message' => $arg->getMessage(),
            );
        }
        else if (is_string($arg)) {
            $arg = array('message' => $arg);
        }

        if (empty($arg['code'])) {
            $arg['code'] = 500;
        }

        // installer
        if (class_exists('rcube_install', false)) {
            $rci = rcube_install::get_instance();
            $rci->raise_error($arg);
            return;
        }

        $cli = php_sapi_name() == 'cli';

        if (($log || $terminate) && !$cli && $arg['message']) {
            $arg['fatal'] = $terminate;
            self::log_bug($arg);
        }

        // terminate script
        if ($terminate) {
            // display error page
            if (is_object(self::$instance->output)) {
                self::$instance->output->raise_error($arg['code'], $arg['message']);
            }
            else if ($cli) {
                fwrite(STDERR, 'ERROR: ' . $arg['message']);
            }

            exit(1);
        }
    }


    /**
     * Report error according to configured debug_level
     *
     * @param array Named parameters
     * @see self::raise_error()
     */
    public static function log_bug($arg_arr)
    {
        $program = strtoupper(!empty($arg_arr['type']) ? $arg_arr['type'] : 'php');
        $level   = self::get_instance()->config->get('debug_level');

        // disable errors for ajax requests, write to log instead (#1487831)
        if (($level & 4) && !empty($_REQUEST['_remote'])) {
            $level = ($level ^ 4) | 1;
        }

        // write error to local log file
        if (($level & 1) || !empty($arg_arr['fatal'])) {
            if ($_SERVER['REQUEST_METHOD'] == 'POST') {
                $post_query = '?_task='.urlencode($_POST['_task']).'&_action='.urlencode($_POST['_action']);
            }
            else {
                $post_query = '';
            }

            $log_entry = sprintf("%s Error: %s%s (%s %s)",
                $program,
                $arg_arr['message'],
                $arg_arr['file'] ? sprintf(' in %s on line %d', $arg_arr['file'], $arg_arr['line']) : '',
                $_SERVER['REQUEST_METHOD'],
                $_SERVER['REQUEST_URI'] . $post_query);

            if (!self::write_log('errors', $log_entry)) {
                // send error to PHPs error handler if write_log didn't succeed
                trigger_error($arg_arr['message'], E_USER_WARNING);
            }
        }

        // report the bug to the global bug reporting system
        if ($level & 2) {
            // TODO: Send error via HTTP
        }

        // show error if debug_mode is on
        if ($level & 4) {
            print "<b>$program Error";

            if (!empty($arg_arr['file']) && !empty($arg_arr['line'])) {
                print " in $arg_arr[file] ($arg_arr[line])";
            }

            print ':</b>&nbsp;';
            print nl2br($arg_arr['message']);
            print '<br />';
            flush();
        }
    }


    /**
     * Returns current time (with microseconds).
     *
     * @return float Current time in seconds since the Unix
     */
    public static function timer()
    {
        return microtime(true);
    }


    /**
     * Logs time difference according to provided timer
     *
     * @param float  $timer  Timer (self::timer() result)
     * @param string $label  Log line prefix
     * @param string $dest   Log file name
     *
     * @see self::timer()
     */
    public static function print_timer($timer, $label = 'Timer', $dest = 'console')
    {
        static $print_count = 0;

        $print_count++;
        $now  = self::timer();
        $diff = $now - $timer;

        if (empty($label)) {
            $label = 'Timer '.$print_count;
        }

        self::write_log($dest, sprintf("%s: %0.4f sec", $label, $diff));
    }


    /**
     * Getter for logged user ID.
     *
     * @return mixed User identifier
     */
    public function get_user_id()
    {
        if (is_object($this->user)) {
            return $this->user->ID;
        }
        else if (isset($_SESSION['user_id'])) {
            return $_SESSION['user_id'];
        }

        return null;
    }


    /**
     * Getter for logged user name.
     *
     * @return string User name
     */
    public function get_user_name()
    {
        if (is_object($this->user)) {
            return $this->user->get_username();
        }
        else if (isset($_SESSION['username'])) {
            return $_SESSION['username'];
        }
    }


    /**
     * Getter for logged user email (derived from user name not identity).
     *
     * @return string User email address
     */
    public function get_user_email()
    {
        if (is_object($this->user)) {
            return $this->user->get_username('mail');
        }
    }


    /**
     * Getter for logged user password.
     *
     * @return string User password
     */
    public function get_user_password()
    {
        if ($this->password) {
            return $this->password;
        }
        else if ($_SESSION['password']) {
            return $this->decrypt($_SESSION['password']);
        }
    }

    /**
     * Get the per-user log directory
     */
    protected function get_user_log_dir()
    {
        $log_dir = $this->config->get('log_dir', RCUBE_INSTALL_PATH . 'logs');
        $user_name = $this->get_user_name();
        $user_log_dir = $log_dir . '/' . $user_name;

        return !empty($user_name) && is_writable($user_log_dir) ? $user_log_dir : false;
    }

    /**
     * Getter for logged user language code.
     *
     * @return string User language code
     */
    public function get_user_language()
    {
        if (is_object($this->user)) {
            return $this->user->language;
        }
        else if (isset($_SESSION['language'])) {
            return $_SESSION['language'];
        }
    }

    /**
     * Unique Message-ID generator.
     *
     * @return string Message-ID
     */
    public function gen_message_id()
    {
        $local_part  = md5(uniqid('rcube'.mt_rand(), true));
        $domain_part = $this->user->get_username('domain');

        // Try to find FQDN, some spamfilters doesn't like 'localhost' (#1486924)
        if (!preg_match('/\.[a-z]+$/i', $domain_part)) {
            foreach (array($_SERVER['HTTP_HOST'], $_SERVER['SERVER_NAME']) as $host) {
                $host = preg_replace('/:[0-9]+$/', '', $host);
                if ($host && preg_match('/\.[a-z]+$/i', $host)) {
                    $domain_part = $host;
                }
            }
        }

        return sprintf('<%s@%s>', $local_part, $domain_part);
    }

    /**
     * Send the given message using the configured method.
     *
     * @param object $message    Reference to Mail_MIME object
     * @param string $from       Sender address string
     * @param array  $mailto     Array of recipient address strings
     * @param array  $error      SMTP error array (reference)
     * @param string $body_file  Location of file with saved message body (reference),
     *                           used when delay_file_io is enabled
     * @param array  $options    SMTP options (e.g. DSN request)
     *
     * @return boolean Send status.
     */
    public function deliver_message(&$message, $from, $mailto, &$error, &$body_file = null, $options = null)
    {
        $plugin = $this->plugins->exec_hook('message_before_send', array(
            'message' => $message,
            'from'    => $from,
            'mailto'  => $mailto,
            'options' => $options,
        ));

        if ($plugin['abort']) {
            if (!empty($plugin['error'])) {
                $error = $plugin['error'];
            }
            if (!empty($plugin['body_file'])) {
                $body_file = $plugin['body_file'];
            }

            return isset($plugin['result']) ? $plugin['result'] : false;
        }

        $from    = $plugin['from'];
        $mailto  = $plugin['mailto'];
        $options = $plugin['options'];
        $message = $plugin['message'];
        $headers = $message->headers();

        // send thru SMTP server using custom SMTP library
        if ($this->config->get('smtp_server')) {
            // generate list of recipients
            $a_recipients = (array) $mailto;

            if (strlen($headers['Cc']))
                $a_recipients[] = $headers['Cc'];
            if (strlen($headers['Bcc']))
                $a_recipients[] = $headers['Bcc'];

            // clean Bcc from header for recipients
            $send_headers = $headers;
            unset($send_headers['Bcc']);
            // here too, it because txtHeaders() below use $message->_headers not only $send_headers
            unset($message->_headers['Bcc']);

            $smtp_headers = $message->txtHeaders($send_headers, true);

            if ($message->getParam('delay_file_io')) {
                // use common temp dir
                $temp_dir = $this->config->get('temp_dir');
                $body_file = tempnam($temp_dir, 'rcmMsg');
                if (PEAR::isError($mime_result = $message->saveMessageBody($body_file))) {
                    self::raise_error(array('code' => 650, 'type' => 'php',
                        'file' => __FILE__, 'line' => __LINE__,
                        'message' => "Could not create message: ".$mime_result->getMessage()),
                        TRUE, FALSE);
                    return false;
                }
                $msg_body = fopen($body_file, 'r');
            }
            else {
                $msg_body = $message->get();
            }

            // send message
            if (!is_object($this->smtp)) {
                $this->smtp_init(true);
            }

            $sent     = $this->smtp->send_mail($from, $a_recipients, $smtp_headers, $msg_body, $options);
            $response = $this->smtp->get_response();
            $error    = $this->smtp->get_error();

            // log error
            if (!$sent) {
                self::raise_error(array('code' => 800, 'type' => 'smtp',
                    'line' => __LINE__, 'file' => __FILE__,
                    'message' => "SMTP error: ".join("\n", $response)), TRUE, FALSE);
            }
        }
        // send mail using PHP's mail() function
        else {
            // unset some headers because they will be added by the mail() function
            $headers_enc = $message->headers($headers);
            $headers_php = $message->_headers;
            unset($headers_php['To'], $headers_php['Subject']);

            // reset stored headers and overwrite
            $message->_headers = array();
            $header_str = $message->txtHeaders($headers_php);

            // #1485779
            if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
                if (preg_match_all('/<([^@]+@[^>]+)>/', $headers_enc['To'], $m)) {
                    $headers_enc['To'] = implode(', ', $m[1]);
                }
            }

            $msg_body = $message->get();

            if (PEAR::isError($msg_body)) {
                self::raise_error(array('code' => 650, 'type' => 'php',
                    'file' => __FILE__, 'line' => __LINE__,
                    'message' => "Could not create message: ".$msg_body->getMessage()),
                    TRUE, FALSE);
            }
            else {
                $delim   = $this->config->header_delimiter();
                $to      = $headers_enc['To'];
                $subject = $headers_enc['Subject'];
                $header_str = rtrim($header_str);

                if ($delim != "\r\n") {
                    $header_str = str_replace("\r\n", $delim, $header_str);
                    $msg_body   = str_replace("\r\n", $delim, $msg_body);
                    $to         = str_replace("\r\n", $delim, $to);
                    $subject    = str_replace("\r\n", $delim, $subject);
                }

                if (filter_var(ini_get('safe_mode'), FILTER_VALIDATE_BOOLEAN))
                    $sent = mail($to, $subject, $msg_body, $header_str);
                else
                    $sent = mail($to, $subject, $msg_body, $header_str, "-f$from");
            }
        }

        if ($sent) {
            $this->plugins->exec_hook('message_sent', array('headers' => $headers, 'body' => $msg_body));

            // remove MDN headers after sending
            unset($headers['Return-Receipt-To'], $headers['Disposition-Notification-To']);

            if ($this->config->get('smtp_log')) {
                // get all recipient addresses
                if (is_array($mailto)) {
                    $mailto = implode(',', $mailto);
                }
                if ($headers['Cc']) {
                    $mailto .= ',' . $headers['Cc'];
                }
                if ($headers['Bcc']) {
                    $mailto .= ',' . $headers['Bcc'];
                }

                $mailto = rcube_mime::decode_address_list($mailto, null, false, null, true);

                self::write_log('sendmail', sprintf("User %s [%s]; Message for %s; %s",
                    $this->user->get_username(),
                    rcube_utils::remote_addr(),
                    implode(', ', $mailto),
                    !empty($response) ? join('; ', $response) : ''));
            }
        }
        else {
            // allow plugins to catch sending errors with the same parameters as in 'message_before_send'
            $this->plugins->exec_hook('message_send_error', $plugin + array('error' => $error));
        }

        if (is_resource($msg_body)) {
            fclose($msg_body);
        }

        $message->_headers = array();
        $message->headers($headers);

        return $sent;
    }

}


/**
 * Lightweight plugin API class serving as a dummy if plugins are not enabled
 *
 * @package Framework
 * @subpackage Core
 */
class rcube_dummy_plugin_api
{
    /**
     * Triggers a plugin hook.
     * @see rcube_plugin_api::exec_hook()
     */
    public function exec_hook($hook, $args = array())
    {
        return $args;
    }
}