Fix rcube_utils::normalize_string() to support unicode characters + add arg...

Thomas Bruederli

2014-12-28 e8b82c2e7b0ae2e5d45ecb600813b8990568feb9

 program/lib/Roundcube/rcube_message.php

@@ -2,10 +2,8 @@

/*
 +-----------------------------------------------------------------------+
 | program/include/rcube_message.php                                     |
 |                                                                       |
 | This file is part of the Roundcube Webmail client                     |
 | Copyright (C) 2008-2010, The Roundcube Dev Team                       |
 | Copyright (C) 2008-2014, The Roundcube Dev Team                       |
 |                                                                       |
 | Licensed under the GNU General Public License version 3 or            |
 | any later version with exceptions for skins & plugins.                |
@@ -18,7 +16,6 @@
 | Author: Thomas Bruederli <roundcube@gmail.com>                        |
 +-----------------------------------------------------------------------+
*/


/**
 * Logical representation of a mail message with all its data
@@ -64,6 +61,8 @@
    public $sender = null;
    public $is_safe = false;

    const BODY_MAX_SIZE = 1048576; // 1MB


    /**
     * __construct
@@ -77,6 +76,11 @@
     */
    function __construct($uid, $folder = null)
    {
        // decode combined UID-folder identifier
        if (preg_match('/^\d+-.+/', $uid)) {
            list($uid, $folder) = explode('-', $uid, 2);
        }

        $this->uid  = $uid;
        $this->app  = rcube::get_instance();
        $this->storage = $this->app->get_storage();
@@ -88,15 +92,16 @@

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

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

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

        $this->subject = $this->mime->decode_mime_string($this->headers->subject);
        $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']) || $_SESSION['safe_messages'][$uid]));
        $this->set_safe((intval($_GET['_safe']) || $_SESSION['safe_messages'][$this->folder.':'.$uid]));
        $this->opt = array(
            'safe' => $this->is_safe,
            'prefer_html' => $this->app->config->get('prefer_html'),
@@ -128,15 +133,11 @@
     */
    public function get_header($name, $raw = false)
    {
        if (empty($this->headers))
        if (empty($this->headers)) {
            return null;
        }

        if ($this->headers->$name)
            $value = $this->headers->$name;
        else if ($this->headers->others[$name])
            $value = $this->headers->others[$name];

        return $raw ? $value : $this->mime->decode_header($value);
        return $this->headers->get($name, !$raw);
    }


@@ -147,8 +148,7 @@
     */
    public function set_safe($safe = true)
    {
        $this->is_safe = $safe;
        $_SESSION['safe_messages'][$this->uid] = $this->is_safe;
        $_SESSION['safe_messages'][$this->folder.':'.$this->uid] = $this->is_safe = $safe;
    }


@@ -156,12 +156,13 @@
     * 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' : '');
            return $this->opt['get_url'] . '&_part=' . $mime_id . ($embed ? '&_embed=1&_mimeclass=' . $embed : '');
        else
            return false;
    }
@@ -174,10 +175,12 @@
     * @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
     * @param boolean  $formatted         Enables formatting of text/* parts bodies
     *
     * @return string Part content
     * @deprecated
     */
    public function get_part_content($mime_id, $fp = null, $skip_charset_conv = false, $max_bytes = 0)
    public function get_part_content($mime_id, $fp = null, $skip_charset_conv = false, $max_bytes = 0, $formatted = true)
    {
        if ($part = $this->mime_parts[$mime_id]) {
            // stored in message structure (winmail/inline-uuencode)
@@ -191,45 +194,212 @@
            // 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);
            return $this->storage->get_message_part($this->uid, $mime_id, $part,
                NULL, $fp, $skip_charset_conv, $max_bytes, $formatted);
        }
    }


    /**
     * Determine if the message contains a HTML part
     * Get content of a specific part of this message
     *
     * @param bool $recursive Enables checking in all levels of the structure
     * @param bool $enriched  Enables checking for text/enriched parts too
     * @param string  $mime_id   Part ID
     * @param boolean $formatted Enables formatting of text/* parts bodies
     * @param int     $max_bytes Only return/read this number of bytes
     * @param mixed   $mode      NULL to return a string, -1 to print body
     *                           or file pointer to save the body into
     *
     * @return string|bool Part content or operation status
     */
    public function get_part_body($mime_id, $formatted = false, $max_bytes = 0, $mode = null)
    {
        if (!($part = $this->mime_parts[$mime_id])) {
            return;
        }

        // only text parts can be formatted
        $formatted = $formatted && $part->ctype_primary == 'text';

        // part body not fetched yet... save in memory if it's small enough
        if ($part->body === null && is_numeric($mime_id) && $part->size < self::BODY_MAX_SIZE) {
            $this->storage->set_folder($this->folder);
            // Warning: body here should be always unformatted
            $part->body = $this->storage->get_message_part($this->uid, $mime_id, $part,
                null, null, true, 0, false);
        }

        // body stored in message structure (winmail/inline-uuencode)
        if ($part->body !== null || $part->encoding == 'stream') {
            $body = $part->body;

            if ($formatted && $body) {
                $body = self::format_part_body($body, $part, $this->headers->charset);
            }

            if ($max_bytes && strlen($body) > $max_bytes) {
                $body = substr($body, 0, $max_bytes);
            }

            if (is_resource($mode)) {
                if ($body !== false) {
                    fwrite($mode, $body);
                    rewind($mode);
                }

                return $body !== false;
            }

            if ($mode === -1) {
                if ($body !== false) {
                    print($body);
                }

                return $body !== false;
            }

            return $body;
        }

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

        $body = $this->storage->get_message_part($this->uid, $mime_id, $part,
            $mode === -1, is_resource($mode) ? $mode : null,
            !($mode && $formatted), $max_bytes, $mode && $formatted);

        if (is_resource($mode)) {
            rewind($mode);
            return $body !== false;
        }

        if (!$mode && $body && $formatted) {
            $body = self::format_part_body($body, $part, $this->headers->charset);
        }

        return $body;
    }


    /**
     * Format text message part for display
     *
     * @param string             $body            Part body
     * @param rcube_message_part $part            Part object
     * @param string             $default_charset Fallback charset if part charset is not specified
     *
     * @return string Formatted body
     */
    public static function format_part_body($body, $part, $default_charset = null)
    {
        // remove useless characters
        $body = preg_replace('/[\t\r\0\x0B]+\n/', "\n", $body);

        // remove NULL characters if any (#1486189)
        if (strpos($body, "\x00") !== false) {
            $body = str_replace("\x00", '', $body);
        }

        // detect charset...
        if (!$part->charset || strtoupper($part->charset) == 'US-ASCII') {
            // try to extract charset information from HTML meta tag (#1488125)
            if ($part->ctype_secondary == 'html' && preg_match('/<meta[^>]+charset=([a-z0-9-_]+)/i', $body, $m)) {
                $part->charset = strtoupper($m[1]);
            }
            else if ($default_charset) {
                $part->charset = $default_charset;
            }
            else {
                $rcube         = rcube::get_instance();
                $part->charset = $rcube->config->get('default_charset', RCUBE_CHARSET);
            }
        }

        // ..convert charset encoding
        $body = rcube_charset::convert($body, $part->charset);

        return $body;
    }


    /**
     * Determine if the message contains a HTML part. This must to be
     * a real part not an attachment (or its part)
     *
     * @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, $enriched = false)
    function has_html_part($enriched = false)
    {
        // check all message parts
        foreach ($this->parts as $part) {
        foreach ($this->mime_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('.', $part->mime_id);
                // Skip if part is an attachment, don't use is_attachment() here
                if ($part->filename) {
                    continue;
                }

                    // Skip if level too deep or part has a file name
                    if (count($level) > 2 || $part->filename) {
                        continue;
                $level = explode('.', $part->mime_id);
                $depth = count($level);

                // Check if the part belongs to higher-level's multipart part
                // this can be alternative/related/signed/encrypted or mixed
                while (array_pop($level) !== null) {
                    $parent_depth = count($level);
                    if (!$parent_depth) {
                        return true;
                    }

                    // HTML part can be on the lower level, if not...
                    if (count($level) > 1) {
                        array_pop($level);
                        $parent = $this->mime_parts[join('.', $level)];
                        // ... parent isn't multipart/alternative or related
                        if ($parent->mimetype != 'multipart/alternative' && $parent->mimetype != 'multipart/related') {
                            continue;
                        }
                    $parent = $this->mime_parts[join('.', $level)];
                    if (!preg_match('/^multipart\/(alternative|related|signed|encrypted|mixed)$/', $parent->mimetype)
                        || ($parent->mimetype == 'multipart/mixed' && $parent_depth < $depth - 1)) {
                        continue 2;
                    }
                }

                return true;
                if ($part->size) {
                    return true;
                }
            }
        }

        return false;
    }


    /**
     * Determine if the message contains a text/plain part. This must to be
     * a real part not an attachment (or its part)
     *
     * @return bool True if a plain text part is available, False if not
     */
    function has_text_part()
    {
        // check all message parts
        foreach ($this->mime_parts as $part) {
            if ($part->mimetype == 'text/plain') {
                // Skip if part is an attachment, don't use is_attachment() here
                if ($part->filename) {
                    continue;
                }

                $level = explode('.', $part->mime_id);

                // 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;
                    }
                }

                if ($part->size) {
                    return true;
                }
            }
        }

@@ -247,7 +417,7 @@
        // check all message parts
        foreach ($this->mime_parts as $pid => $part) {
            if ($part->mimetype == 'text/html') {
                return $this->get_part_content($pid);
                return $this->get_part_body($pid, true);
            }
        }
    }
@@ -268,13 +438,13 @@
        // check all message parts
        foreach ($this->mime_parts as $mime_id => $part) {
            if ($part->mimetype == 'text/plain') {
                return $this->get_part_content($mime_id);
                return $this->get_part_body($mime_id, true);
            }
            else if ($part->mimetype == 'text/html') {
                $out = $this->get_part_content($mime_id);
                $out = $this->get_part_body($mime_id, true);

                // create instance of html2text class
                $txt = new html2text($out);
                $txt = new rcube_html2text($out);
                return $txt->get_text();
            }
        }
@@ -320,16 +490,24 @@
    private function parse_structure($structure, $recursive = false)
    {
        // real content-type of message/rfc822 part
        if ($structure->mimetype == 'message/rfc822' && $structure->real_mimetype)
        if ($structure->mimetype == 'message/rfc822' && $structure->real_mimetype) {
            $mimetype = $structure->real_mimetype;

            // parse headers from message/rfc822 part
            if (!isset($structure->headers['subject']) && !isset($structure->headers['from'])) {
                list($headers, ) = explode("\r\n\r\n", $this->get_part_body($structure->mime_id, false, 32768));
                $structure->headers = rcube_mime::parse_headers($headers);
            }
        }
        else
            $mimetype = $structure->mimetype;

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

@@ -346,45 +524,60 @@

        // 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;
            $this->parts[] = $structure;

            // Parse simple (plain text) message body
            if ($message_ctype_secondary == 'plain')
            if ($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;
            $this->parts[] = $structure;
        }
        // message contains (more than one!) alternative parts
        else if ($mimetype == 'multipart/alternative'
            && is_array($structure->parts) && count($structure->parts) > 1
        ) {
            // get html/plaintext parts
            $plain_part = $html_part = $print_part = $related_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 (!$sub_part->size && preg_match('#^text/(plain|html|enriched)$#', $sub_mimetype)) {
                if (!$sub_part->size && !$is_multipart) {
                    continue;
                }

                // We've encountered (malformed) messages with more than
                // one text/plain or text/html part here. There's no way to choose
                // which one is better, so we'll display first of them and add
                // others as attachments (#1489358)

                // check if sub part is
                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 = $p;
                else if (in_array($sub_mimetype, array('multipart/related', 'multipart/mixed', 'multipart/alternative')))
                if ($is_multipart)
                    $related_part = $p;
                else if ($sub_mimetype == 'text/plain' && !$plain_part)
                    $plain_part = $p;
                else if ($sub_mimetype == 'text/html' && !$html_part)
                    $html_part = $p;
                else if ($sub_mimetype == 'text/enriched' && !$enriched_part)
                    $enriched_part = $p;
                else {
                    // add unsupported/unrecognized parts to attachments list
                    $this->attachments[] = $sub_part;
                }
            }

            // parse related part (alternative part could be in here)
@@ -400,13 +593,13 @@

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

            // add the right message body
@@ -425,14 +618,6 @@

                $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[] = $html_part;
            }
        }
        // this is an ecrypted message -> create a plaintext body with the according message
        else if ($mimetype == 'multipart/encrypted') {
@@ -442,6 +627,17 @@
            $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;
        }
@@ -459,8 +655,9 @@
                    $part_mimetype = $mail_part->real_mimetype;
                    list($primary_type, $secondary_type) = explode('/', $part_mimetype);
                }
                else
                    $part_mimetype = $mail_part->mimetype;
                else {
                    $part_mimetype = $part_orig_mimetype = $mail_part->mimetype;
                  }

                // multipart/alternative
                if ($primary_type == 'multipart') {
@@ -502,10 +699,6 @@
                    if (!empty($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') {
@@ -537,7 +730,7 @@
                        continue;

                    // part belongs to a related message and is linked
                    if ($mimetype == 'multipart/related'
                    if (preg_match('/^multipart\/(related|relative)/', $mimetype)
                        && ($mail_part->headers['content-id'] || $mail_part->headers['content-location'])) {
                        if ($mail_part->headers['content-id'])
                            $mail_part->content_id = preg_replace(array('/^</', '/>$/'), '', $mail_part->headers['content-id']);
@@ -557,9 +750,6 @@
                    // regular attachment with valid content type
                    // (content-type name regexp according to RFC4288.4.2)
                    else if (preg_match('/^[a-z0-9!#$&.+^_-]+\/[a-z0-9!#$&.+^_-]+$/i', $part_mimetype)) {
                        if (!$mail_part->filename)
                            $mail_part->filename = 'Part '.$mail_part->mime_id;

                        $this->attachments[] = $mail_part;
                    }
                    // attachment with invalid content type
@@ -579,13 +769,13 @@
            }

            // if this was a related part try to resolve references
            if ($mimetype == 'multipart/related' && sizeof($this->inline_parts)) {
            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, true);
                    if ($inline_object->content_id)
                    $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;
@@ -624,7 +814,6 @@
        }
        // message is a single part non-text (without filename)
        else if (preg_match('/application\//i', $mimetype)) {
            $structure->filename = 'Part '.$structure->mime_id;
            $this->attachments[] = $structure;
        }
    }
@@ -654,20 +843,18 @@
     */
    function tnef_decode(&$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);
        }
        // @TODO: attachment may be huge, handle body via file
        $body     = $this->get_part_body($part->mime_id);
        $tnef     = new rcube_tnef_decoder;
        $tnef_arr = $tnef->decompress($body);
        $parts    = array();

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

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

            $tpart->filename        = trim($winatt['name']);
            $tpart->filename        = $this->fix_attachment_name(trim($winatt['name']), $part);
            $tpart->encoding        = 'stream';
            $tpart->ctype_primary   = trim(strtolower($winatt['type']));
            $tpart->ctype_secondary = trim(strtolower($winatt['subtype']));
@@ -692,55 +879,109 @@
     */
    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);
        }
        // @TODO: messages may be huge, handle body via file
        $part->body = $this->get_part_body($part->mime_id);
        $parts      = array();
        $pid        = 0;

        $parts = array();
        // FIXME: line length is max.65?
        $uu_regexp = '/begin [0-7]{3,4} ([^\n]+)\n/s';
        $uu_regexp_begin = '/begin [0-7]{3,4} ([^\r\n]+)\r?\n/s';
        $uu_regexp_end   = '/`\r?\nend((\r?\n)|($))/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;
            $uu_endstring = "`\nend\n";
        while (preg_match($uu_regexp_begin, $part->body, $matches, PREG_OFFSET_CAPTURE)) {
            $startpos = $matches[0][1];

            // 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[$pid]);
            if (!preg_match($uu_regexp_end, $part->body, $m, PREG_OFFSET_CAPTURE, $startpos)) {
                break;
            }

            // remove attachments bodies from the message body
            $part->body = preg_replace($uu_regexp, '', $part->body);
            $endpos    = $m[0][1];
            $begin_len = strlen($matches[0][0]);
            $end_len   = strlen($m[0][0]);

            // extract attachment body
            $filebody = substr($part->body, $startpos + $begin_len, $endpos - $startpos - $begin_len - 1);
            $filebody = str_replace("\r\n", "\n", $filebody);

            // remove attachment body from the message body
            $part->body = substr_replace($part->body, '', $startpos, $endpos + $end_len - $startpos);
            // mark body as modified so it will not be cached by rcube_imap_cache
            $part->body_modified = true;

            // add attachments to the structure
            $uupart = new rcube_message_part;
            $uupart->filename = trim($matches[1][0]);
            $uupart->encoding = 'stream';
            $uupart->body     = convert_uudecode($filebody);
            $uupart->size     = strlen($uupart->body);
            $uupart->mime_id  = 'uu.' . $part->mime_id . '.' . $pid;

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

            $parts[] = $uupart;
            $pid++;
        }

        return $parts;
    }

    /**
     * Fix attachment name encoding if needed/possible
     */
    protected function fix_attachment_name($name, $part)
    {
        if ($name == rcube_charset::clean($name)) {
            return $name;
        }

        // find charset from part or its parent(s)
        if ($part->charset) {
            $charsets[] = $part->charset;
        }
        else {
            // check first part (common case)
            $n = strpos($part->mime_id, '.') ? preg_replace('/\.[0-9]+$/', '', $part->mime_id) . '.1' : 1;
            if (($_part = $this->mime_parts[$n]) && $_part->charset) {
                $charsets[] = $_part->charset;
            }

            // check parents' charset
            $items = explode('.', $part->mime_id);
            for ($i = count($items)-1; $i > 0; $i--) {
                $last   = array_pop($items);
                $parent = $this->mime_parts[join('.', $items)];

                if ($parent && $parent->charset) {
                    $charsets[] = $parent->charset;
                }
            }
        }

        if ($this->headers->charset) {
            $charsets[] = $this->headers->charset;
        }

        if (empty($charsets)) {
            $rcube      = rcube::get_instance();
            $charsets[] = rcube_charset::detect($name, $rcube->config->get('default_charset', RCUBE_CHARSET));
        }

        foreach (array_unique($charsets) as $charset) {
            $_name = rcube_charset::convert($name, $charset);

            if ($_name == rcube_charset::clean($_name)) {
                if (!$part->charset) {
                    $part->charset = $charset;
                }

                return $_name;
            }
        }

        return $name;
    }

    /**
     * Deprecated methods (to be removed)