summaryrefslogtreecommitdiff
path: root/program/lib/Roundcube/rcube_message.php
blob: 0701cc0eebe3643f16fe7295146d75480f7eb20f (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
<?php

/*
 +-----------------------------------------------------------------------+
 | This file is part of the Roundcube Webmail client                     |
 | Copyright (C) 2008-2010, The Roundcube Dev Team                       |
 |                                                                       |
 | 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:                                                              |
 |   Logical representation of a mail message with all its data          |
 |   and related functions                                               |
 +-----------------------------------------------------------------------+
 | Author: Thomas Bruederli <roundcube@gmail.com>                        |
 +-----------------------------------------------------------------------+
*/

/**
 * Logical representation of a mail message with all its data
 * and related functions
 *
 * @package    Framework
 * @subpackage Storage
 * @author     Thomas Bruederli <roundcube@gmail.com>
 */
class rcube_message
{
    /**
     * Instace of framework class.
     *
     * @var rcube
     */
    private $app;

    /**
     * Instance of storage class
     *
     * @var rcube_storage
     */
    private $storage;

    /**
     * Instance of mime class
     *
     * @var rcube_mime
     */
    private $mime;
    private $opt = array();
    private $parse_alternative = false;

    public $uid;
    public $folder;
    public $headers;
    public $parts = array();
    public $mime_parts = array();
    public $inline_parts = array();
    public $attachments = array();
    public $subject = '';
    public $sender = null;
    public $is_safe = false;


    /**
     * __construct
     *
     * Provide a uid, and parse message structure.
     *
     * @param string $uid    The message UID.
     * @param string $folder Folder name
     *
     * @see self::$app, self::$storage, self::$opt, self::$parts
     */
    function __construct($uid, $folder = null)
    {
        $this->uid  = $uid;
        $this->app  = rcube::get_instance();
        $this->storage = $this->app->get_storage();
        $this->folder  = strlen($folder) ? $folder : $this->storage->get_folder();
        $this->storage->set_options(array('all_headers' => true));

        // Set current folder
        $this->storage->set_folder($this->folder);

        $this->headers = $this->storage->get_message($uid);

        if (!$this->headers) {
            return;
        }

        $this->mime = new rcube_mime($this->headers->charset);

        $this->subject = $this->headers->get('subject');
        list(, $this->sender) = each($this->mime->decode_address_list($this->headers->from, 1));

        $this->set_safe((intval($_GET['_safe']) || $_SESSION['safe_messages'][$this->folder.':'.$uid]));
        $this->opt = array(
            'safe' => $this->is_safe,
            'prefer_html' => $this->app->config->get('prefer_html'),
            'get_url' => $this->app->url(array(
                'action' => 'get',
                'mbox'   => $this->storage->get_folder(),
                'uid'    => $uid))
        );

        if (!empty($this->headers->structure)) {
            $this->get_mime_numbers($this->headers->structure);
            $this->parse_structure($this->headers->structure);
        }
        else {
            $this->body = $this->storage->get_body($uid);
        }

        // notify plugins and let them analyze this structured message object
        $this->app->plugins->exec_hook('message_load', array('object' => $this));
    }


    /**
     * Return a (decoded) message header
     *
     * @param string $name Header name
     * @param bool   $row  Don't mime-decode the value
     * @return string Header value
     */
    public function get_header($name, $raw = false)
    {
        if (empty($this->headers)) {
            return null;
        }

        return $this->headers->get($name, !$raw);
    }


    /**
     * Set is_safe var and session data
     *
     * @param bool $safe enable/disable
     */
    public function set_safe($safe = true)
    {
        $_SESSION['safe_messages'][$this->folder.':'.$this->uid] = $this->is_safe = $safe;
    }


    /**
     * Compose a valid URL for getting a message part
     *
     * @param string $mime_id Part MIME-ID
     * @param mixed  $embed Mimetype class for parts to be embedded
     * @return string URL or false if part does not exist
     */
    public function get_part_url($mime_id, $embed = false)
    {
        if ($this->mime_parts[$mime_id])
            return $this->opt['get_url'] . '&_part=' . $mime_id . ($embed ? '&_embed=1&_mimeclass=' . $embed : '');
        else
            return false;
    }


    /**
     * Get content of a specific part of this message
     *
     * @param string   $mime_id           Part MIME-ID
     * @param resource $fp File           pointer to save the message part
     * @param boolean  $skip_charset_conv Disables charset conversion
     * @param int      $max_bytes         Only read this number of bytes
     *
     * @return string Part content
     */
    public function get_part_content($mime_id, $fp = null, $skip_charset_conv = false, $max_bytes = 0)
    {
        if ($part = $this->mime_parts[$mime_id]) {
            // stored in message structure (winmail/inline-uuencode)
            if (!empty($part->body) || $part->encoding == 'stream') {
                if ($fp) {
                    fwrite($fp, $part->body);
                }
                return $fp ? true : $part->body;
            }

            // get from IMAP
            $this->storage->set_folder($this->folder);

            return $this->storage->get_message_part($this->uid, $mime_id, $part, NULL, $fp, $skip_charset_conv, $max_bytes);
        }
    }


    /**
     * Determine if the message contains a HTML part
     *
     * @param bool $recursive Enables checking in all levels of the structure
     * @param bool $enriched  Enables checking for text/enriched parts too
     *
     * @return bool True if a HTML is available, False if not
     */
    function has_html_part($recursive = true, $enriched = false)
    {
        // check all message parts
        foreach ($this->parts as $part) {
            if ($part->mimetype == 'text/html' || ($enriched && $part->mimetype == 'text/enriched')) {
                // Level check, we'll skip e.g. HTML attachments
                if (!$recursive) {
                    $level = explode('.', $part->mime_id);

                    // Skip if part is an attachment
                    if ($this->is_attachment($part)) {
                        continue;
                    }

                    // Check if the part belongs to higher-level's alternative/related
                    while (array_pop($level) !== null) {
                        if (!count($level)) {
                            return true;
                        }

                        $parent = $this->mime_parts[join('.', $level)];
                        if ($parent->mimetype != 'multipart/alternative' && $parent->mimetype != 'multipart/related') {
                            continue 2;
                        }
                    }
                }

                return true;
            }
        }

        return false;
    }


    /**
     * Return the first HTML part of this message
     *
     * @return string HTML message part content
     */
    function first_html_part()
    {
        // check all message parts
        foreach ($this->mime_parts as $pid => $part) {
            if ($part->mimetype == 'text/html') {
                return $this->get_part_content($pid);
            }
        }
    }


    /**
     * Return the first text part of this message
     *
     * @param rcube_message_part $part Reference to the part if found
     * @return string Plain text message/part content
     */
    function first_text_part(&$part=null)
    {
        // no message structure, return complete body
        if (empty($this->parts))
            return $this->body;

        // check all message parts
        foreach ($this->mime_parts as $mime_id => $part) {
            if ($part->mimetype == 'text/plain') {
                return $this->get_part_content($mime_id);
            }
            else if ($part->mimetype == 'text/html') {
                $out = $this->get_part_content($mime_id);

                // create instance of html2text class
                $txt = new rcube_html2text($out);
                return $txt->get_text();
            }
        }

        $part = null;
        return null;
    }


    /**
     * Checks if part of the message is an attachment (or part of it)
     *
     * @param rcube_message_part $part Message part
     *
     * @return bool True if the part is an attachment part
     */
    public function is_attachment($part)
    {
        foreach ($this->attachments as $att_part) {
            if ($att_part->mime_id == $part->mime_id) {
                return true;
            }

            // check if the part is a subpart of another attachment part (message/rfc822)
            if ($att_part->mimetype == 'message/rfc822') {
                if (in_array($part, (array)$att_part->parts)) {
                    return true;
                }
            }
        }

        return false;
    }


    /**
     * Read the message structure returend by the IMAP server
     * and build flat lists of content parts and attachments
     *
     * @param rcube_message_part $structure Message structure node
     * @param bool               $recursive True when called recursively
     */
    private function parse_structure($structure, $recursive = false)
    {
        // real content-type of message/rfc822 part
        if ($structure->mimetype == 'message/rfc822' && $structure->real_mimetype) {
            $mimetype = $structure->real_mimetype;

            // parse headers from message/rfc822 part
            if (!isset($structure->headers['subject'])) {
                list($headers, $dump) = explode("\r\n\r\n", $this->get_part_content($structure->mime_id, null, true, 8192));
                $structure->headers = rcube_mime::parse_headers($headers);
            }
        }
        else
            $mimetype = $structure->mimetype;

        // show message headers
        if ($recursive && is_array($structure->headers) && isset($structure->headers['subject'])) {
            $c = new stdClass;
            $c->type = 'headers';
            $c->headers = $structure->headers;
            $this->parts[] = $c;
        }

        // Allow plugins to handle message parts
        $plugin = $this->app->plugins->exec_hook('message_part_structure',
            array('object' => $this, 'structure' => $structure,
                'mimetype' => $mimetype, 'recursive' => $recursive));

        if ($plugin['abort'])
            return;

        $structure = $plugin['structure'];
        list($message_ctype_primary, $message_ctype_secondary) = explode('/', $plugin['mimetype']);

        // print body if message doesn't have multiple parts
        if ($message_ctype_primary == 'text' && !$recursive) {
            // parts with unsupported type add to attachments list
            if (!in_array($message_ctype_secondary, array('plain', 'html', 'enriched'))) {
                $this->attachments[] = $structure;
                return;
            }

            $structure->type = 'content';
            $this->parts[] = $structure;

            // Parse simple (plain text) message body
            if ($message_ctype_secondary == 'plain') {
                foreach ((array)$this->uu_decode($structure) as $uupart) {
                    $this->mime_parts[$uupart->mime_id] = $uupart;
                    $this->attachments[] = $uupart;
                }
            }
        }
        // the same for pgp signed messages
        else if ($mimetype == 'application/pgp' && !$recursive) {
            $structure->type = 'content';
            $this->parts[] = $structure;
        }
        // message contains (more than one!) alternative parts
        else if ($mimetype == 'multipart/alternative'
            && is_array($structure->parts) && count($structure->parts) > 1
        ) {
            $plain_part   = null;
            $html_part    = null;
            $print_part   = null;
            $related_part = null;
            $attach_part  = null;

            // get html/plaintext parts, other add to attachments list
            foreach ($structure->parts as $p => $sub_part) {
                $sub_mimetype = $sub_part->mimetype;
                $is_multipart = preg_match('/^multipart\/(related|relative|mixed|alternative)/', $sub_mimetype);

                // skip empty text parts
                if (!$sub_part->size && !$is_multipart) {
                    continue;
                }

                // check if sub part is
                if ($is_multipart)
                    $related_part = $p;
                else if ($sub_mimetype == 'text/plain')
                    $plain_part = $p;
                else if ($sub_mimetype == 'text/html')
                    $html_part = $p;
                else if ($sub_mimetype == 'text/enriched')
                    $enriched_part = $p;
                else
                    $attach_part = $p;
            }

            // parse related part (alternative part could be in here)
            if ($related_part !== null && !$this->parse_alternative) {
                $this->parse_alternative = true;
                $this->parse_structure($structure->parts[$related_part], true);
                $this->parse_alternative = false;

                // if plain part was found, we should unset it if html is preferred
                if ($this->opt['prefer_html'] && count($this->parts))
                    $plain_part = null;
            }

            // choose html/plain part to print
            if ($html_part !== null && $this->opt['prefer_html']) {
                $print_part = $structure->parts[$html_part];
            }
            else if ($enriched_part !== null) {
                $print_part = $structure->parts[$enriched_part];
            }
            else if ($plain_part !== null) {
                $print_part = $structure->parts[$plain_part];
            }

            // add the right message body
            if (is_object($print_part)) {
                $print_part->type = 'content';
                $this->parts[] = $print_part;
            }
            // show plaintext warning
            else if ($html_part !== null && empty($this->parts)) {
                $c = new stdClass;
                $c->type            = 'content';
                $c->ctype_primary   = 'text';
                $c->ctype_secondary = 'plain';
                $c->mimetype        = 'text/plain';
                $c->realtype        = 'text/html';

                $this->parts[] = $c;
            }

            // add html part as attachment
            if ($html_part !== null && $structure->parts[$html_part] !== $print_part) {
                $html_part = $structure->parts[$html_part];
                $html_part->mimetype = 'text/html';

                $this->attachments[] = $html_part;
            }

            // add unsupported/unrecognized parts to attachments list
            if ($attach_part) {
                $this->attachments[] = $structure->parts[$attach_part];
            }
        }
        // this is an ecrypted message -> create a plaintext body with the according message
        else if ($mimetype == 'multipart/encrypted') {
            $p = new stdClass;
            $p->type            = 'content';
            $p->ctype_primary   = 'text';
            $p->ctype_secondary = 'plain';
            $p->mimetype        = 'text/plain';
            $p->realtype        = 'multipart/encrypted';

            $this->parts[] = $p;
        }
        // this is an S/MIME ecrypted message -> create a plaintext body with the according message
        else if ($mimetype == 'application/pkcs7-mime') {
            $p = new stdClass;
            $p->type            = 'content';
            $p->ctype_primary   = 'text';
            $p->ctype_secondary = 'plain';
            $p->mimetype        = 'text/plain';
            $p->realtype        = 'application/pkcs7-mime';

            $this->parts[] = $p;
        }
        // message contains multiple parts
        else if (is_array($structure->parts) && !empty($structure->parts)) {
            // iterate over parts
            for ($i=0; $i < count($structure->parts); $i++) {
                $mail_part      = &$structure->parts[$i];
                $primary_type   = $mail_part->ctype_primary;
                $secondary_type = $mail_part->ctype_secondary;

                // real content-type of message/rfc822
                if ($mail_part->real_mimetype) {
                    $part_orig_mimetype = $mail_part->mimetype;
                    $part_mimetype = $mail_part->real_mimetype;
                    list($primary_type, $secondary_type) = explode('/', $part_mimetype);
                }
                else
                    $part_mimetype = $mail_part->mimetype;

                // multipart/alternative
                if ($primary_type == 'multipart') {
                    $this->parse_structure($mail_part, true);

                    // list message/rfc822 as attachment as well (mostly .eml)
                    if ($part_orig_mimetype == 'message/rfc822' && !empty($mail_part->filename))
                        $this->attachments[] = $mail_part;
                }
                // part text/[plain|html] or delivery status
                else if ((($part_mimetype == 'text/plain' || $part_mimetype == 'text/html') && $mail_part->disposition != 'attachment') ||
                    in_array($part_mimetype, array('message/delivery-status', 'text/rfc822-headers', 'message/disposition-notification'))
                ) {
                    // Allow plugins to handle also this part
                    $plugin = $this->app->plugins->exec_hook('message_part_structure',
                        array('object' => $this, 'structure' => $mail_part,
                            'mimetype' => $part_mimetype, 'recursive' => true));

                    if ($plugin['abort'])
                        continue;

                    if ($part_mimetype == 'text/html' && $mail_part->size) {
                        $got_html_part = true;
                    }

                    $mail_part = $plugin['structure'];
                    list($primary_type, $secondary_type) = explode('/', $plugin['mimetype']);

                    // add text part if it matches the prefs
                    if (!$this->parse_alternative ||
                        ($secondary_type == 'html' && $this->opt['prefer_html']) ||
                        ($secondary_type == 'plain' && !$this->opt['prefer_html'])
                    ) {
                        $mail_part->type = 'content';
                        $this->parts[] = $mail_part;
                    }

                    // list as attachment as well
                    if (!empty($mail_part->filename)) {
                        $this->attachments[] = $mail_part;
                    }
                    // list html part as attachment (here the part is most likely inside a multipart/related part)
                    else if ($this->parse_alternative && ($secondary_type == 'html' && !$this->opt['prefer_html'])) {
                        $this->attachments[] = $mail_part;
                    }
                }
                // part message/*
                else if ($primary_type == 'message') {
                    $this->parse_structure($mail_part, true);

                    // list as attachment as well (mostly .eml)
                    if (!empty($mail_part->filename))
                        $this->attachments[] = $mail_part;
                }
                // ignore "virtual" protocol parts
                else if ($primary_type == 'protocol') {
                    continue;
                }
                // part is Microsoft Outlook TNEF (winmail.dat)
                else if ($part_mimetype == 'application/ms-tnef') {
                    foreach ((array)$this->tnef_decode($mail_part) as $tpart) {
                        $this->mime_parts[$tpart->mime_id] = $tpart;
                        $this->attachments[] = $tpart;
                    }
                }
                // part is a file/attachment
                else if (preg_match('/^(inline|attach)/', $mail_part->disposition) ||
                    $mail_part->headers['content-id'] ||
                    ($mail_part->filename &&
                        (empty($mail_part->disposition) || preg_match('/^[a-z0-9!#$&.+^_-]+$/i', $mail_part->disposition)))
                ) {
                    // skip apple resource forks
                    if ($message_ctype_secondary == 'appledouble' && $secondary_type == 'applefile')
                        continue;

                    // part belongs to a related message and is linked
                    if (preg_match('/^multipart\/(related|relative)/', $mimetype)
                        && ($mail_part->headers['content-id'] || $mail_part->headers['content-location'])) {
                        if ($mail_part->headers['content-id'])
                            $mail_part->content_id = preg_replace(array('/^</', '/>$/'), '', $mail_part->headers['content-id']);
                        if ($mail_part->headers['content-location'])
                            $mail_part->content_location = $mail_part->headers['content-base'] . $mail_part->headers['content-location'];

                        $this->inline_parts[] = $mail_part;
                    }
                    // attachment encapsulated within message/rfc822 part needs further decoding (#1486743)
                    else if ($part_orig_mimetype == 'message/rfc822') {
                        $this->parse_structure($mail_part, true);

                        // list as attachment as well (mostly .eml)
                        if (!empty($mail_part->filename))
                            $this->attachments[] = $mail_part;
                    }
                    // regular attachment with valid content type
                    // (content-type name regexp according to RFC4288.4.2)
                    else if (preg_match('/^[a-z0-9!#$&.+^_-]+\/[a-z0-9!#$&.+^_-]+$/i', $part_mimetype)) {
                        $this->attachments[] = $mail_part;
                    }
                    // attachment with invalid content type
                    // replace malformed content type with application/octet-stream (#1487767)
                    else if ($mail_part->filename) {
                        $mail_part->ctype_primary   = 'application';
                        $mail_part->ctype_secondary = 'octet-stream';
                        $mail_part->mimetype        = 'application/octet-stream';

                        $this->attachments[] = $mail_part;
                    }
                }
                // attachment part as message/rfc822 (#1488026)
                else if ($mail_part->mimetype == 'message/rfc822') {
                    $this->parse_structure($mail_part);
                }
            }

            // if this was a related part try to resolve references
            if (preg_match('/^multipart\/(related|relative)/', $mimetype) && sizeof($this->inline_parts)) {
                $a_replaces = array();
                $img_regexp = '/^image\/(gif|jpe?g|png|tiff|bmp|svg)/';

                foreach ($this->inline_parts as $inline_object) {
                    $part_url = $this->get_part_url($inline_object->mime_id, $inline_object->ctype_primary);
                    if (isset($inline_object->content_id))
                        $a_replaces['cid:'.$inline_object->content_id] = $part_url;
                    if ($inline_object->content_location) {
                        $a_replaces[$inline_object->content_location] = $part_url;
                    }

                    if (!empty($inline_object->filename)) {
                        // MS Outlook sends sometimes non-related attachments as related
                        // In this case multipart/related message has only one text part
                        // We'll add all such attachments to the attachments list
                        if (!isset($got_html_part) && empty($inline_object->content_id)) {
                            $this->attachments[] = $inline_object;
                        }
                        // MS Outlook sometimes also adds non-image attachments as related
                        // We'll add all such attachments to the attachments list
                        // Warning: some browsers support pdf in <img/>
                        else if (!preg_match($img_regexp, $inline_object->mimetype)) {
                            $this->attachments[] = $inline_object;
                        }
                        // @TODO: we should fetch HTML body and find attachment's content-id
                        // to handle also image attachments without reference in the body
                        // @TODO: should we list all image attachments in text mode?
                    }
                }

                // add replace array to each content part
                // (will be applied later when part body is available)
                foreach ($this->parts as $i => $part) {
                    if ($part->type == 'content')
                        $this->parts[$i]->replaces = $a_replaces;
                }
            }
        }
        // message is a single part non-text
        else if ($structure->filename) {
            $this->attachments[] = $structure;
        }
        // message is a single part non-text (without filename)
        else if (preg_match('/application\//i', $mimetype)) {
            $this->attachments[] = $structure;
        }
    }


    /**
     * Fill aflat array with references to all parts, indexed by part numbers
     *
     * @param rcube_message_part $part Message body structure
     */
    private function get_mime_numbers(&$part)
    {
        if (strlen($part->mime_id))
            $this->mime_parts[$part->mime_id] = &$part;

        if (is_array($part->parts))
            for ($i=0; $i<count($part->parts); $i++)
                $this->get_mime_numbers($part->parts[$i]);
    }


    /**
     * Decode a Microsoft Outlook TNEF part (winmail.dat)
     *
     * @param rcube_message_part $part Message part to decode
     * @return array
     */
    function tnef_decode(&$part)
    {
        // @TODO: attachment may be huge, hadle it via file
        if (!isset($part->body)) {
            $this->storage->set_folder($this->folder);
            $part->body = $this->storage->get_message_part($this->uid, $part->mime_id, $part);
        }

        $parts = array();
        $tnef = new tnef_decoder;
        $tnef_arr = $tnef->decompress($part->body);

        foreach ($tnef_arr as $pid => $winatt) {
            $tpart = new rcube_message_part;

            $tpart->filename        = trim($winatt['name']);
            $tpart->encoding        = 'stream';
            $tpart->ctype_primary   = trim(strtolower($winatt['type']));
            $tpart->ctype_secondary = trim(strtolower($winatt['subtype']));
            $tpart->mimetype        = $tpart->ctype_primary . '/' . $tpart->ctype_secondary;
            $tpart->mime_id         = 'winmail.' . $part->mime_id . '.' . $pid;
            $tpart->size            = $winatt['size'];
            $tpart->body            = $winatt['stream'];

            $parts[] = $tpart;
            unset($tnef_arr[$pid]);
        }

        return $parts;
    }


    /**
     * Parse message body for UUencoded attachments bodies
     *
     * @param rcube_message_part $part Message part to decode
     * @return array
     */
    function uu_decode(&$part)
    {
        // @TODO: messages may be huge, hadle body via file
        if (!isset($part->body)) {
            $this->storage->set_folder($this->folder);
            $part->body = $this->storage->get_message_part($this->uid, $part->mime_id, $part);
        }

        $parts = array();
        // FIXME: line length is max.65?
        $uu_regexp = '/begin [0-7]{3,4} ([^\n]+)\n/s';

        if (preg_match_all($uu_regexp, $part->body, $matches, PREG_SET_ORDER)) {
            // update message content-type
            $part->ctype_primary   = 'multipart';
            $part->ctype_secondary = 'mixed';
            $part->mimetype        = $part->ctype_primary . '/' . $part->ctype_secondary;
            $uu_endstring = "`\nend\n";

            // add attachments to the structure
            foreach ($matches as $pid => $att) {
                $startpos = strpos($part->body, $att[1]) + strlen($att[1]) + 1; // "\n"
                $endpos = strpos($part->body, $uu_endstring);
                $filebody = substr($part->body, $startpos, $endpos-$startpos);

                // remove attachments bodies from the message body
                $part->body = substr_replace($part->body, "", $startpos, $endpos+strlen($uu_endstring)-$startpos);

                $uupart = new rcube_message_part;

                $uupart->filename = trim($att[1]);
                $uupart->encoding = 'stream';
                $uupart->body     = convert_uudecode($filebody);
                $uupart->size     = strlen($uupart->body);
                $uupart->mime_id  = 'uu.' . $part->mime_id . '.' . $pid;

                $ctype = rcube_mime::content_type($uupart->body, $uupart->filename, 'application/octet-stream', true);
                $uupart->mimetype = $ctype;
                list($uupart->ctype_primary, $uupart->ctype_secondary) = explode('/', $ctype);

                $parts[] = $uupart;
                unset($matches[$pid]);
            }

            // remove attachments bodies from the message body
            $part->body = preg_replace($uu_regexp, '', $part->body);
        }

        return $parts;
    }


    /**
     * Deprecated methods (to be removed)
     */

    public static function unfold_flowed($text)
    {
        return rcube_mime::unfold_flowed($text);
    }

    public static function format_flowed($text, $length = 72)
    {
        return rcube_mime::format_flowed($text, $length);
    }

}