Small refactoring to make some code testable

Aleksander Machniak

2015-06-20 1414e3b6f855095af46d2a61e7fa8dcd23e728a5

Small refactoring to make some code testable

 program/steps/mail/compose.inc

@@ -273,149 +273,9 @@
else if (count($MESSAGE->identities)) {
    $ident = rcmail_identity_select($MESSAGE, $MESSAGE->identities, $compose_mode);

    $MESSAGE->compose['from_email'] = $ident['email'];
    $MESSAGE->compose['from']       = $ident['identity_id'];
    $MESSAGE->compose['from']  = $ident['identity_id'];
    $MESSAGE->compose['ident'] = $ident;
}

// Set other headers
$a_recipients = array();
$parts        = array('to', 'cc', 'bcc', 'replyto', 'followupto');
$separator    = trim($RCMAIL->config->get('recipients_separator', ',')) . ' ';
$from_email   = @mb_strtolower($MESSAGE->compose['from_email']);

foreach ($parts as $header) {
    $fvalue        = '';
    $decode_header = true;
    $charset       = $MESSAGE->headers->charset;

    // we have a set of recipients stored is session
    if ($header == 'to' && ($mailto_id = $COMPOSE['param']['mailto'])
        && $_SESSION['mailto'][$mailto_id]
    ) {
        $fvalue        = urldecode($_SESSION['mailto'][$mailto_id]);
        $decode_header = false;
        $charset       = $RCMAIL->output->charset;

        // make session to not grow up too much
        unset($_SESSION['mailto'][$mailto_id]);
        $COMPOSE['param']['to'] = $fvalue;
    }
    else if (!empty($_POST['_'.$header])) {
        $fvalue  = rcube_utils::get_input_value('_'.$header, rcube_utils::INPUT_POST, TRUE);
        $charset = $RCMAIL->output->charset;
    }
    else if (!empty($COMPOSE['param'][$header])) {
        $fvalue  = $COMPOSE['param'][$header];
        $charset = $RCMAIL->output->charset;
    }
    else if ($compose_mode == RCUBE_COMPOSE_REPLY) {
        // get recipent address(es) out of the message headers
        if ($header == 'to') {
            $mailfollowup = $MESSAGE->headers->others['mail-followup-to'];
            $mailreplyto  = $MESSAGE->headers->others['mail-reply-to'];

            // Reply to mailing list...
            if ($MESSAGE->reply_all == 'list' && $mailfollowup)
                $fvalue = $mailfollowup;
            else if ($MESSAGE->reply_all == 'list'
                && preg_match('/<mailto:([^>]+)>/i', $MESSAGE->headers->others['list-post'], $m))
                $fvalue = $m[1];
            // Reply to...
            else if ($MESSAGE->reply_all && $mailfollowup)
                $fvalue = $mailfollowup;
            else if ($mailreplyto)
                $fvalue = $mailreplyto;
            else if (!empty($MESSAGE->headers->replyto)) {
                $fvalue  = $MESSAGE->headers->replyto;
                $replyto = true;
            }
            else if (!empty($MESSAGE->headers->from))
                $fvalue = $MESSAGE->headers->from;

            // Reply to message sent by yourself (#1487074, #1489230, #1490439)
            // Reply-To address need to be unset (#1490233)
            if (!empty($ident) && empty($replyto)) {
                foreach (array($fvalue, $MESSAGE->headers->from) as $sender) {
                    $senders = rcube_mime::decode_address_list($sender, null, false, $charset, true);

                    if (in_array($ident['email_ascii'], $senders)) {
                        $fvalue = $MESSAGE->headers->to;
                        break;
                    }
                }
            }
        }
        // add recipient of original message if reply to all
        else if ($header == 'cc' && !empty($MESSAGE->reply_all) && $MESSAGE->reply_all != 'list') {
            if ($v = $MESSAGE->headers->to)
                $fvalue .= $v;
            if ($v = $MESSAGE->headers->cc)
                $fvalue .= (!empty($fvalue) ? $separator : '') . $v;
            // Use Sender header (#1489011)
            if (($v = $MESSAGE->headers->get('Sender', false)) && strpos($v, '-bounces@') === false)
                $fvalue .= (!empty($fvalue) ? $separator : '') . $v;

            // When To: and Reply-To: are the same we add From: address to the list (#1489037)
            if ($v = $MESSAGE->headers->from) {
                $from    = rcube_mime::decode_address_list($v, null, false, $charset, true);
                $to      = rcube_mime::decode_address_list($MESSAGE->headers->to, null, false, $charset, true);
                $replyto = rcube_mime::decode_address_list($MESSAGE->headers->replyto, null, false, $charset, true);

                if (count($replyto) && !count(array_diff($to, $replyto)) && count(array_diff($from, $to))) {
                    $fvalue .= (!empty($fvalue) ? $separator : '') . $v;
                }
            }
        }
    }
    else if (in_array($compose_mode, array(RCUBE_COMPOSE_DRAFT, RCUBE_COMPOSE_EDIT))) {
        // get drafted headers
        if ($header=='to' && !empty($MESSAGE->headers->to))
            $fvalue = $MESSAGE->get_header('to', true);
        else if ($header=='cc' && !empty($MESSAGE->headers->cc))
            $fvalue = $MESSAGE->get_header('cc', true);
        else if ($header=='bcc' && !empty($MESSAGE->headers->bcc))
            $fvalue = $MESSAGE->get_header('bcc', true);
        else if ($header=='replyto' && !empty($MESSAGE->headers->others['mail-reply-to']))
            $fvalue = $MESSAGE->get_header('mail-reply-to');
        else if ($header=='replyto' && !empty($MESSAGE->headers->replyto))
            $fvalue = $MESSAGE->get_header('reply-to');
        else if ($header=='followupto' && !empty($MESSAGE->headers->others['mail-followup-to']))
            $fvalue = $MESSAGE->get_header('mail-followup-to');
    }

    // split recipients and put them back together in a unique way
    if (!empty($fvalue) && in_array($header, array('to', 'cc', 'bcc'))) {
        $to_addresses = rcube_mime::decode_address_list($fvalue, null, $decode_header, $charset);
        $fvalue       = array();

        foreach ($to_addresses as $addr_part) {
            if (empty($addr_part['mailto'])) {
                continue;
            }

            // According to RFC5321 local part of email address is case-sensitive
            // however, here it is better to compare addresses in case-insensitive manner
            $mailto    = format_email(rcube_utils::idn_to_utf8($addr_part['mailto']));
            $mailto_lc = mb_strtolower($addr_part['mailto']);

            if (($header == 'to' || $compose_mode != RCUBE_COMPOSE_REPLY || $mailto_lc != $from_email)
                && !in_array($mailto_lc, $a_recipients)
            ) {
                if ($addr_part['name'] && $mailto != $addr_part['name']) {
                    $mailto = format_email_recipient($mailto, $addr_part['name']);
                }

                $fvalue[]       = $mailto;
                $a_recipients[] = $mailto_lc;
            }
        }

        $fvalue = implode($separator, $fvalue);
    }

    $MESSAGE->compose[$header] = $fvalue;
}
unset($a_recipients);

// process $MESSAGE body/attachments, set $MESSAGE_BODY/$HTML_MODE vars and some session data
$MESSAGE_BODY = rcmail_prepare_message_body();
@@ -589,7 +449,7 @@

        // create teaxtarea object
        $input = new $field_type($field_attrib);
        $out   = $input->show($MESSAGE->compose[$param]);
        $out   = $input->show(rcmail_compose_header_value($param));
    }

    if ($form_start) {
@@ -605,7 +465,7 @@

function rcmail_compose_header_from($attrib)
{
    global $MESSAGE, $OUTPUT, $RCMAIL, $COMPOSE, $compose_mode;
    global $MESSAGE, $OUTPUT, $RCMAIL, $COMPOSE;

    // pass the following attributes to the form class
    $field_attrib = array('name' => '_from');
@@ -620,7 +480,7 @@
        $identities   = array();
        $top_posting  = intval($RCMAIL->config->get('reply_mode')) > 0
            && !$RCMAIL->config->get('sig_below')
            && ($compose_mode == RCUBE_COMPOSE_REPLY || $compose_mode == RCUBE_COMPOSE_FORWARD);
            && ($COMPOSE['mode'] == RCUBE_COMPOSE_REPLY || $COMPOSE['mode'] == RCUBE_COMPOSE_FORWARD);
        $separator = $top_posting ? '---' : '-- ';

        $field_attrib['onchange'] = rcmail_output::JS_OBJECT_NAME.".change_identity(this)";
@@ -662,7 +522,7 @@
            }
        }

        $out = $select_from->show($MESSAGE->compose['from']);
        $out = $select_from->show(rcmail_compose_header_value('from'));

        // add signatures to client
        $OUTPUT->set_env('signatures', $a_signatures);
@@ -672,23 +532,177 @@
    else {
        $field_attrib['class'] = 'from_address';
        $input_from = new html_inputfield($field_attrib);
        $out = $input_from->show($MESSAGE->compose['from']);
        $out = $input_from->show(rcmail_compose_header_value('from'));
    }

    return $out;
}

function rcmail_compose_header_value($header)
{
    global $COMPOSE, $MESSAGE;

    $RCMAIL        = rcube::get_instance();
    $fvalue        = '';
    $decode_header = true;
    $charset       = $MESSAGE->headers->charset;
    $separator     = trim($RCMAIL->config->get('recipients_separator', ',')) . ' ';

    // we have a set of recipients stored is session
    if ($header == 'to' && ($mailto_id = $COMPOSE['param']['mailto'])
        && $_SESSION['mailto'][$mailto_id]
    ) {
        $fvalue        = urldecode($_SESSION['mailto'][$mailto_id]);
        $decode_header = false;
        $charset       = $RCMAIL->output->charset;

        // make session to not grow up too much
        unset($_SESSION['mailto'][$mailto_id]);
        $COMPOSE['param']['to'] = $fvalue;
    }
    else if (!empty($_POST['_' . $header])) {
        $fvalue  = rcube_utils::get_input_value('_' . $header, rcube_utils::INPUT_POST, true);
        $charset = $RCMAIL->output->charset;
    }
    else if (!empty($COMPOSE['param'][$header])) {
        $fvalue  = $COMPOSE['param'][$header];
        $charset = $RCMAIL->output->charset;
    }
    else if ($COMPOSE['mode'] == RCUBE_COMPOSE_REPLY) {
        // get recipent address(es) out of the message headers
        if ($header == 'to') {
            $mailfollowup = $MESSAGE->headers->others['mail-followup-to'];
            $mailreplyto  = $MESSAGE->headers->others['mail-reply-to'];

            // Reply to mailing list...
            if ($MESSAGE->reply_all == 'list' && $mailfollowup) {
                $fvalue = $mailfollowup;
            }
            else if ($MESSAGE->reply_all == 'list'
                && preg_match('/<mailto:([^>]+)>/i', $MESSAGE->headers->others['list-post'], $m)
            ) {
                $fvalue = $m[1];
            }
            // Reply to...
            else if ($MESSAGE->reply_all && $mailfollowup) {
                $fvalue = $mailfollowup;
            }
            else if ($mailreplyto) {
                $fvalue = $mailreplyto;
            }
            else if (!empty($MESSAGE->headers->replyto)) {
                $fvalue  = $MESSAGE->headers->replyto;
                $replyto = true;
            }
            else if (!empty($MESSAGE->headers->from)) {
                $fvalue = $MESSAGE->headers->from;
            }

            // Reply to message sent by yourself (#1487074, #1489230, #1490439)
            // Reply-To address need to be unset (#1490233)
            if (!empty($MESSAGE->compose['ident']) && empty($replyto)) {
                foreach (array($fvalue, $MESSAGE->headers->from) as $sender) {
                    $senders = rcube_mime::decode_address_list($sender, null, false, $charset, true);

                    if (in_array($MESSAGE->compose['ident']['email_ascii'], $senders)) {
                        $fvalue = $MESSAGE->headers->to;
                        break;
                    }
                }
            }
        }
        // add recipient of original message if reply to all
        else if ($header == 'cc' && !empty($MESSAGE->reply_all) && $MESSAGE->reply_all != 'list') {
            if ($v = $MESSAGE->headers->to) {
                $fvalue .= $v;
            }
            if ($v = $MESSAGE->headers->cc) {
                $fvalue .= (!empty($fvalue) ? $separator : '') . $v;
            }
            // Use Sender header (#1489011)
            if (($v = $MESSAGE->headers->get('Sender', false)) && strpos($v, '-bounces@') === false) {
                $fvalue .= (!empty($fvalue) ? $separator : '') . $v;
            }

            // When To: and Reply-To: are the same we add From: address to the list (#1489037)
            if ($v = $MESSAGE->headers->from) {
                $from    = rcube_mime::decode_address_list($v, null, false, $charset, true);
                $to      = rcube_mime::decode_address_list($MESSAGE->headers->to, null, false, $charset, true);
                $replyto = rcube_mime::decode_address_list($MESSAGE->headers->replyto, null, false, $charset, true);

                if (count($replyto) && !count(array_diff($to, $replyto)) && count(array_diff($from, $to))) {
                    $fvalue .= (!empty($fvalue) ? $separator : '') . $v;
                }
            }
        }
    }
    else if (in_array($COMPOSE['mode'], array(RCUBE_COMPOSE_DRAFT, RCUBE_COMPOSE_EDIT))) {
        // get drafted headers
        if ($header == 'to' && !empty($MESSAGE->headers->to)) {
            $fvalue = $MESSAGE->get_header('to', true);
        }
        else if ($header == 'cc' && !empty($MESSAGE->headers->cc)) {
            $fvalue = $MESSAGE->get_header('cc', true);
        }
        else if ($header == 'bcc' && !empty($MESSAGE->headers->bcc)) {
            $fvalue = $MESSAGE->get_header('bcc', true);
        }
        else if ($header == 'replyto' && !empty($MESSAGE->headers->others['mail-reply-to'])) {
            $fvalue = $MESSAGE->get_header('mail-reply-to');
        }
        else if ($header == 'replyto' && !empty($MESSAGE->headers->replyto)) {
            $fvalue = $MESSAGE->get_header('reply-to');
        }
        else if ($header == 'followupto' && !empty($MESSAGE->headers->others['mail-followup-to'])) {
            $fvalue = $MESSAGE->get_header('mail-followup-to');
        }
    }

    // split recipients and put them back together in a unique way
    if (!empty($fvalue) && in_array($header, array('to', 'cc', 'bcc'))) {
        $from_email   = @mb_strtolower($MESSAGE->compose['ident']['email']);
        $to_addresses = rcube_mime::decode_address_list($fvalue, null, $decode_header, $charset);
        $fvalue       = array();

        foreach ($to_addresses as $addr_part) {
            if (empty($addr_part['mailto'])) {
                continue;
            }

            // According to RFC5321 local part of email address is case-sensitive
            // however, here it is better to compare addresses in case-insensitive manner
            $mailto    = format_email(rcube_utils::idn_to_utf8($addr_part['mailto']));
            $mailto_lc = mb_strtolower($addr_part['mailto']);

            if (($header == 'to' || $COMPOSE['mode'] != RCUBE_COMPOSE_REPLY || $mailto_lc != $from_email)
                && !in_array($mailto_lc, (array) $MESSAGE->recipients)
            ) {
                if ($addr_part['name'] && $mailto != $addr_part['name']) {
                    $mailto = format_email_recipient($mailto, $addr_part['name']);
                }

                $fvalue[]              = $mailto;
                $MESSAGE->recipients[] = $mailto_lc;
            }
        }

        $fvalue = implode($separator, $fvalue);
    }

    return $fvalue;
}

function rcmail_compose_editor_mode()
{
    global $RCMAIL, $compose_mode;
    global $RCMAIL;
    static $useHtml;

    if ($useHtml !== null) {
        return $useHtml;
    }

    $html_editor = intval($RCMAIL->config->get('htmleditor'));
    $html_editor  = intval($RCMAIL->config->get('htmleditor'));
    $compose_mode = $COMPOSE['mode'];

    if (isset($_POST['_is_html'])) {
        $useHtml = !empty($_POST['_is_html']);
@@ -718,7 +732,7 @@

function rcmail_prepare_message_body()
{
    global $RCMAIL, $MESSAGE, $COMPOSE, $compose_mode, $HTML_MODE;
    global $RCMAIL, $MESSAGE, $COMPOSE, $HTML_MODE;

    // use posted message body
    if (!empty($_POST['_message'])) {
@@ -730,20 +744,20 @@
        $isHtml = (bool) $COMPOSE['param']['html'];
    }
    // forward as attachment
    else if ($compose_mode == RCUBE_COMPOSE_FORWARD && $COMPOSE['as_attachment']) {
    else if ($COMPOSE['mode'] == RCUBE_COMPOSE_FORWARD && $COMPOSE['as_attachment']) {
        $isHtml = rcmail_compose_editor_mode();
        $body   = '';

        rcmail_write_forward_attachments();
    }
    // reply/edit/draft/forward
    else if ($compose_mode && ($compose_mode != RCUBE_COMPOSE_REPLY || intval($RCMAIL->config->get('reply_mode')) != -1)) {
    else if ($COMPOSE['mode'] && ($COMPOSE['mode'] != RCUBE_COMPOSE_REPLY || intval($RCMAIL->config->get('reply_mode')) != -1)) {
        $isHtml   = rcmail_compose_editor_mode();
        $messages = array();

        if (!empty($MESSAGE->parts)) {
            // collect IDs of message/rfc822 parts
            if ($compose_mode == RCUBE_COMPOSE_EDIT || $compose_mode == RCUBE_COMPOSE_DRAFT) {
            if ($COMPOSE['mode'] == RCUBE_COMPOSE_EDIT || $COMPOSE['mode'] == RCUBE_COMPOSE_DRAFT) {
                foreach ($MESSAGE->attachments as $part) {
                    if ($part->mimetype == 'message/rfc822') {
                        $messages[] = $part->mime_id;
@@ -774,13 +788,13 @@
        }

        // compose reply-body
        if ($compose_mode == RCUBE_COMPOSE_REPLY)
        if ($COMPOSE['mode'] == RCUBE_COMPOSE_REPLY)
            $body = rcmail_create_reply_body($body, $isHtml);
        // forward message body inline
        else if ($compose_mode == RCUBE_COMPOSE_FORWARD)
        else if ($COMPOSE['mode'] == RCUBE_COMPOSE_FORWARD)
            $body = rcmail_create_forward_body($body, $isHtml);
        // load draft message body
        else if ($compose_mode == RCUBE_COMPOSE_DRAFT || $compose_mode == RCUBE_COMPOSE_EDIT)
        else if ($COMPOSE['mode'] == RCUBE_COMPOSE_DRAFT || $COMPOSE['mode'] == RCUBE_COMPOSE_EDIT)
            $body = rcmail_create_draft_body($body, $isHtml);
    }
    else { // new message
@@ -788,7 +802,7 @@
    }

    $plugin = $RCMAIL->plugins->exec_hook('message_compose_body',
        array('body' => $body, 'html' => $isHtml, 'mode' => $compose_mode));
        array('body' => $body, 'html' => $isHtml, 'mode' => $COMPOSE['mode']));

    $body = $plugin['body'];
    unset($plugin);
@@ -811,7 +825,7 @@

function rcmail_compose_part_body($part, $isHtml = false)
{
    global $RCMAIL, $MESSAGE, $LINE_LENGTH, $compose_mode;
    global $RCMAIL, $MESSAGE, $LINE_LENGTH;

    // Check if we have enough memory to handle the message in it
    // #1487424: we need up to 10x more memory than the body
@@ -835,7 +849,7 @@
        }
        else {
            // try to remove the signature
            if ($compose_mode != RCUBE_COMPOSE_DRAFT && $compose_mode != RCUBE_COMPOSE_EDIT) {
            if ($COMPOSE['mode'] != RCUBE_COMPOSE_DRAFT && $COMPOSE['mode'] != RCUBE_COMPOSE_EDIT) {
                if ($RCMAIL->config->get('strip_existing_sig', true)) {
                    $body = rcmail_remove_signature($body);
                }
@@ -854,7 +868,7 @@
        if ($part->ctype_secondary == 'html') {
            // use html part if it has been used for message (pre)viewing
            // decrease line length for quoting
            $len = $compose_mode == RCUBE_COMPOSE_REPLY ? $LINE_LENGTH-2 : $LINE_LENGTH;
            $len = $COMPOSE['mode'] == RCUBE_COMPOSE_REPLY ? $LINE_LENGTH-2 : $LINE_LENGTH;
            $txt = new rcube_html2text($body, false, true, $len);
            $body = $txt->get_text();
        }
@@ -864,7 +878,7 @@
            }

            // try to remove the signature
            if ($compose_mode != RCUBE_COMPOSE_DRAFT && $compose_mode != RCUBE_COMPOSE_EDIT) {
            if ($COMPOSE['mode'] != RCUBE_COMPOSE_DRAFT && $COMPOSE['mode'] != RCUBE_COMPOSE_EDIT) {
                if ($RCMAIL->config->get('strip_existing_sig', true)) {
                    $body = rcmail_remove_signature($body);
                }
@@ -1163,7 +1177,7 @@

function rcmail_write_compose_attachments(&$message, $bodyIsHtml)
{
    global $RCMAIL, $COMPOSE, $compose_mode;
    global $RCMAIL, $COMPOSE;

    $loaded_attachments = array();
    foreach ((array)$COMPOSE['attachments'] as $attachment) {
@@ -1181,12 +1195,12 @@
            }

            // skip message attachments in reply mode
            if ($part->ctype_primary == 'message' && $compose_mode == RCUBE_COMPOSE_REPLY) {
            if ($part->ctype_primary == 'message' && $COMPOSE['mode'] == RCUBE_COMPOSE_REPLY) {
                continue;
            }

            // skip inline images when forwarding in text mode
            if ($part->content_id && $part->disposition == 'inline' && !$bodyIsHtml && $compose_mode == RCUBE_COMPOSE_FORWARD) {
            if ($part->content_id && $part->disposition == 'inline' && !$bodyIsHtml && $COMPOSE['mode'] == RCUBE_COMPOSE_FORWARD) {
                continue;
            }

@@ -1196,12 +1210,12 @@
            // skipped e.g. images used in HTML body or other attachments. So,
            // better to skip .eml attachments but not their content (included files).
            if ($part->mimetype == 'message/rfc822') {
                if ($compose_mode == RCUBE_COMPOSE_FORWARD) {
                if ($COMPOSE['mode'] == RCUBE_COMPOSE_FORWARD) {
                    continue;
                }
                $messages[] = $part->mime_id;
            }
            else if ($compose_mode != RCUBE_COMPOSE_FORWARD) {
            else if ($COMPOSE['mode'] != RCUBE_COMPOSE_FORWARD) {
                // skip attachments included in message/rfc822 attachment (#1486487)
                foreach ($messages as $mimeid) {
                    if (strpos($part->mime_id, $mimeid . '.') === 0) {
@@ -1466,7 +1480,7 @@

function rcmail_compose_subject($attrib)
{
    global $MESSAGE, $COMPOSE, $compose_mode;
    global $MESSAGE, $COMPOSE;

    list($form_start, $form_end) = get_form_tags($attrib);
    unset($attrib['form']);
@@ -1485,7 +1499,7 @@
        $subject = $COMPOSE['param']['subject'];
    }
    // create a reply-subject
    else if ($compose_mode == RCUBE_COMPOSE_REPLY) {
    else if ($COMPOSE['mode'] == RCUBE_COMPOSE_REPLY) {
        if (preg_match('/^re:/i', $MESSAGE->subject))
            $subject = $MESSAGE->subject;
        else
@@ -1495,14 +1509,14 @@
        $subject = preg_replace('/\s*\([wW]as:[^\)]+\)\s*$/', '', $subject);
    }
    // create a forward-subject
    else if ($compose_mode == RCUBE_COMPOSE_FORWARD) {
    else if ($COMPOSE['mode'] == RCUBE_COMPOSE_FORWARD) {
        if (preg_match('/^fwd:/i', $MESSAGE->subject))
            $subject = $MESSAGE->subject;
        else
            $subject = 'Fwd: '.$MESSAGE->subject;
    }
    // creeate a draft-subject
    else if ($compose_mode == RCUBE_COMPOSE_DRAFT || $compose_mode == RCUBE_COMPOSE_EDIT) {
    else if ($COMPOSE['mode'] == RCUBE_COMPOSE_DRAFT || $COMPOSE['mode'] == RCUBE_COMPOSE_EDIT) {
        $subject = $MESSAGE->subject;
    }

@@ -1672,7 +1686,7 @@

function rcmail_mdn_checkbox($attrib)
{
    global $RCMAIL, $MESSAGE, $compose_mode;
    global $RCMAIL, $MESSAGE;

    list($form_start, $form_end) = get_form_tags($attrib);
    unset($attrib['form']);
@@ -1687,7 +1701,7 @@

    if (isset($_POST['_mdn']))
        $mdn_default = $_POST['_mdn'];
    else if (in_array($compose_mode, array(RCUBE_COMPOSE_DRAFT, RCUBE_COMPOSE_EDIT)))
    else if (in_array($COMPOSE['mode'], array(RCUBE_COMPOSE_DRAFT, RCUBE_COMPOSE_EDIT)))
        $mdn_default = (bool) $MESSAGE->headers->mdn_to;
    else
        $mdn_default = $RCMAIL->config->get('mdn_default');