show.php
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show.php
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	<?php

	/**
	+-----------------------------------------------------------------------+
	\| This file is part of the Roundcube Webmail client \|
	\| \|
	\| Copyright (C) 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: \|
	\| Display a mail message similar as a usual mail application does \|
	+-----------------------------------------------------------------------+
	\| Author: Thomas Bruederli <roundcube@gmail.com> \|
	+-----------------------------------------------------------------------+
	*/

	class rcmail_action_mail_show extends rcmail_action_mail_index
	{
	protected static $MESSAGE;
	protected static $CLIENT_MIMETYPES = [];

	/**
	* Request handler.
	*
	* @param array $args Arguments from the previous step(s)
	*/
	public function run($args = [])
	{
	$rcmail = rcmail::get_instance();

	self::$PRINT_MODE = $rcmail->action == 'print';

	// Read browser capabilities and store them in session
	if ($caps = rcube_utils::get_input_value('_caps', rcube_utils::INPUT_GET)) {
	$browser_caps = [];
	foreach (explode(',', $caps) as $cap) {
	$cap = explode('=', $cap);
	$browser_caps[$cap[0]] = $cap[1];
	}

	$_SESSION['browser_caps'] = $browser_caps;
	}

	$msg_id = rcube_utils::get_input_value('_uid', rcube_utils::INPUT_GET);
	$uid = preg_replace('/\.[0-9.]+$/', '', $msg_id);
	$mbox_name = $rcmail->storage->get_folder();

	// similar code as in program/steps/mail/get.inc
	if ($uid) {
	// set message format (need to be done before rcube_message construction)
	if (!empty($_GET['_format'])) {
	$prefer_html = $_GET['_format'] == 'html';
	$rcmail->config->set('prefer_html', $prefer_html);
	$_SESSION['msg_formats'][$mbox_name.':'.$uid] = $prefer_html;
	}
	else if (isset($_SESSION['msg_formats'][$mbox_name.':'.$uid])) {
	$rcmail->config->set('prefer_html', $_SESSION['msg_formats'][$mbox_name.':'.$uid]);
	}

	$MESSAGE = new rcube_message($msg_id, $mbox_name, !empty($_GET['_safe']));

	self::$MESSAGE = $MESSAGE;

	// if message not found (wrong UID)...
	if (empty($MESSAGE->headers)) {
	self::message_error();
	}

	self::$CLIENT_MIMETYPES = self::supported_mimetypes();

	// show images?
	self::check_safe($MESSAGE);

	// set message charset as default
	if (!empty($MESSAGE->headers->charset)) {
	$rcmail->storage->set_charset($MESSAGE->headers->charset);
	}

	if (!isset($_SESSION['writeable_abook'])) {
	$_SESSION['writeable_abook'] = $rcmail->get_address_sources(true) ? true : false;
	}

	$rcmail->output->set_pagetitle(abbreviate_string($MESSAGE->subject, 128, '...', true));

	// set environment
	$rcmail->output->set_env('uid', $msg_id);
	$rcmail->output->set_env('safemode', $MESSAGE->is_safe);
	$rcmail->output->set_env('message_context', $MESSAGE->context);
	$rcmail->output->set_env('message_flags', array_keys(array_change_key_case((array) $MESSAGE->headers->flags)));
	$rcmail->output->set_env('sender', !empty($MESSAGE->sender) ? $MESSAGE->sender['string'] : '');
	$rcmail->output->set_env('mailbox', $mbox_name);
	$rcmail->output->set_env('username', $rcmail->get_user_name());
	$rcmail->output->set_env('permaurl', $rcmail->url(['_action' => 'show', '_uid' => $msg_id, '_mbox' => $mbox_name]));
	$rcmail->output->set_env('has_writeable_addressbook', $_SESSION['writeable_abook']);
	$rcmail->output->set_env('delimiter', $rcmail->storage->get_hierarchy_delimiter());
	$rcmail->output->set_env('mimetypes', self::$CLIENT_MIMETYPES);

	if ($MESSAGE->headers->get('list-post', false)) {
	$rcmail->output->set_env('list_post', true);
	}

	// set configuration
	self::set_env_config(['delete_junk', 'flag_for_deletion', 'read_when_deleted',
	'skip_deleted', 'display_next', 'forward_attachment', 'mailvelope_main_keyring']);

	// set special folders
	foreach (['drafts', 'trash', 'junk'] as $mbox) {
	if ($folder = $rcmail->config->get($mbox . '_mbox')) {
	$rcmail->output->set_env($mbox . '_mailbox', $folder);
	}
	}

	if ($MESSAGE->has_html_part()) {
	$prefer_html = $rcmail->config->get('prefer_html');
	$rcmail->output->set_env('optional_format', $prefer_html ? 'text' : 'html');
	}

	$rcmail->output->add_label('checkingmail', 'deletemessage', 'movemessagetotrash',
	'movingmessage', 'deletingmessage', 'markingmessage', 'replyall', 'replylist',
	'bounce', 'bouncemsg', 'sendingmessage');

	// check for unset disposition notification
	self::mdn_request_handler($MESSAGE);

	if (empty($MESSAGE->headers->flags['SEEN']) && $MESSAGE->context === null) {
	$v = intval($rcmail->config->get('mail_read_time'));
	if ($v > 0) {
	$rcmail->output->set_env('mail_read_time', $v);
	}
	else if ($v == 0) {
	$rcmail->output->command('set_unread_message', $MESSAGE->uid, $mbox_name);
	$rcmail->plugins->exec_hook('message_read', [
	'uid' => $MESSAGE->uid,
	'mailbox' => $mbox_name,
	'message' => $MESSAGE,
	]);

	$set_seen_flag = true;
	}
	}
	}

	$rcmail->output->add_handlers([
	'mailboxname' => [$this, 'mailbox_name_display'],
	'messageattachments' => [$this, 'message_attachments'],
	'messageobjects' => [$this, 'message_objects'],
	'messagesummary' => [$this, 'message_summary'],
	'messageheaders' => [$this, 'message_headers'],
	'messagefullheaders' => [$this, 'message_full_headers'],
	'messagebody' => [$this, 'message_body'],
	'contactphoto' => [$this, 'message_contactphoto'],
	]);

	if ($rcmail->action == 'print' && $rcmail->output->template_exists('messageprint')) {
	$rcmail->output->send('messageprint', false);
	}
	else if ($rcmail->action == 'preview' && $rcmail->output->template_exists('messagepreview')) {
	$rcmail->output->send('messagepreview', false);
	}
	else {
	$rcmail->output->send('message', false);
	}

	// mark message as read
	if (!empty($set_seen_flag)) {
	if ($rcmail->storage->set_flag(self::$MESSAGE->uid, 'SEEN', $mbox_name)) {
	if ($count = self::get_unseen_count($mbox_name)) {
	self::set_unseen_count($mbox_name, $count - 1);
	}
	}
	}

	exit;
	}

	public static function message_attachments($attrib)
	{
	if (empty(self::$MESSAGE->attachments)) {
	return '';
	}

	$rcmail = rcmail::get_instance();
	$out =
	$ol = '';
	$attachments = [];

	foreach (self::$MESSAGE->attachments as $attach_prop) {
	$filename = self::attachment_name($attach_prop, true);
	$filesize = self::message_part_size($attach_prop);
	$mimetype = rcube_mime::fix_mimetype($attach_prop->mimetype);
	$class = rcube_utils::file2class($mimetype, $filename);
	$id = 'attach' . $attach_prop->mime_id;

	if ($mimetype == 'application/octet-stream' && ($type = rcube_mime::file_ext_type($filename))) {
	$mimetype = $type;
	}

	if (!empty($attrib['maxlength']) && mb_strlen($filename) > $attrib['maxlength']) {
	$title = $filename;
	$filename = abbreviate_string($filename, $attrib['maxlength']);
	}
	else {
	$title = '';
	}

	$item = html::span('attachment-name', rcube::Q($filename))
	. html::span('attachment-size', '(' . rcube::Q($filesize) . ')');

	$li_class = $class;

	if (!self::$PRINT_MODE) {
	$link_attrs = [
	'href' => self::$MESSAGE->get_part_url($attach_prop->mime_id, false),
	'onclick' => sprintf('return %s.command(\'load-attachment\',\'%s\',this)',
	rcmail_output::JS_OBJECT_NAME, $attach_prop->mime_id),
	'onmouseover' => $title ? '' : 'rcube_webmail.long_subject_title_ex(this, 0)',
	'title' => $title,
	'class' => 'filename',
	];

	if ($mimetype != 'message/rfc822' && empty($attach_prop->size)) {
	$li_class .= ' no-menu';
	$link_attrs['onclick'] = sprintf('%s.alert_dialog(%s.get_label(\'emptyattachment\')); return false',
	rcmail_output::JS_OBJECT_NAME, rcmail_output::JS_OBJECT_NAME);
	$rcmail->output->add_label('emptyattachment');
	}

	$item = html::a($link_attrs, $item);
	$attachments[$attach_prop->mime_id] = $mimetype;
	}

	$ol .= html::tag('li', ['class' => $li_class, 'id' => $id], $item);
	}

	$out = html::tag('ul', $attrib, $ol, html::$common_attrib);

	$rcmail->output->set_env('attachments', $attachments);
	$rcmail->output->add_gui_object('attachments', $attrib['id']);

	return $out;
	}

	public static function remote_objects_msg()
	{
	$rcmail = rcmail::get_instance();

	$attrib['id'] = 'remote-objects-message';
	$attrib['class'] = 'notice';
	$attrib['style'] = 'display: none';

	$msg = html::span(null, rcube::Q($rcmail->gettext('blockedresources')));

	$buttons = html::a([
	'href' => "#loadremote",
	'onclick' => rcmail_output::JS_OBJECT_NAME . ".command('load-remote')"
	],
	rcube::Q($rcmail->gettext('allow'))
	);

	// add link to save sender in addressbook and reload message
	if (!empty(self::$MESSAGE->sender['mailto']) && $rcmail->config->get('show_images') == 1) {
	$buttons .= ' ' . html::a([
	'href' => "#loadremotealways",
	'onclick' => rcmail_output::JS_OBJECT_NAME . ".command('load-remote', true)",
	'style' => "white-space:nowrap"
	],
	rcube::Q($rcmail->gettext(['name' => 'alwaysallow', 'vars' => ['sender' => self::$MESSAGE->sender['mailto']]]))
	);
	}

	$rcmail->output->add_gui_object('remoteobjectsmsg', $attrib['id']);

	return html::div($attrib, $msg . ' ' . html::span('boxbuttons', $buttons));
	}

	/**
	* Display a warning whenever a suspicious email address has been found in the message.
	*
	* @return string HTML content of the warning element
	*/
	public static function suspicious_content_warning()
	{
	if (empty(self::$SUSPICIOUS_EMAIL)) {
	return '';
	}

	$rcmail = rcmail::get_instance();

	$attrib = [
	'id' => 'suspicious-content-message',
	'class' => 'notice',
	];

	$msg = html::span(null, rcube::Q($rcmail->gettext('suspiciousemail')));

	return html::div($attrib, $msg);
	}

	public static function message_buttons()
	{
	$rcmail = rcmail::get_instance();
	$delim = $rcmail->storage->get_hierarchy_delimiter();
	$dbox = $rcmail->config->get('drafts_mbox');

	// the message is not a draft
	if (self::$MESSAGE->context
	\|\| (self::$MESSAGE->folder != $dbox && strpos(self::$MESSAGE->folder, $dbox.$delim) !== 0)
	) {
	return '';
	}

	$attrib['id'] = 'message-buttons';
	$attrib['class'] = 'information notice';

	$msg = html::span(null, rcube::Q($rcmail->gettext('isdraft')))
	. ' '
	. html::a([
	'href' => "#edit",
	'onclick' => rcmail_output::JS_OBJECT_NAME.".command('edit')"
	],
	rcube::Q($rcmail->gettext('edit'))
	);

	return html::div($attrib, $msg);
	}

	public static function message_objects($attrib)
	{
	if (empty($attrib['id'])) {
	$attrib['id'] = 'message-objects';
	}

	$rcmail = rcmail::get_instance();
	$content = [
	self::message_buttons(),
	self::remote_objects_msg(),
	self::suspicious_content_warning(),
	];

	$plugin = $rcmail->plugins->exec_hook('message_objects',
	['content' => $content, 'message' => self::$MESSAGE]);

	$content = implode("\n", $plugin['content']);

	return html::div($attrib, $content);
	}

	public static function message_contactphoto($attrib)
	{
	$rcmail = rcmail::get_instance();
	$error_handler = false;
	$placeholder = 'data:image/gif;base64,' . rcmail_output::BLANK_GIF;

	if (!empty($attrib['placeholder'])) {
	$placeholder = $rcmail->output->abs_url($attrib['placeholder'], true);
	$placeholder = $rcmail->output->asset_url($placeholder);

	// set error handler on <img>
	$error_handler = true;
	$attrib['onerror'] = "this.onerror = null; this.src = '$placeholder';";
	}

	if (self::$MESSAGE->sender) {
	$photo_img = $rcmail->url([
	'_task' => 'addressbook',
	'_action' => 'photo',
	'_email' => self::$MESSAGE->sender['mailto'],
	'_error' => $error_handler ? 1 : null,
	]);
	}
	else {
	$photo_img = $placeholder;
	}

	return html::img(['src' => $photo_img, 'alt' => $rcmail->gettext('contactphoto')] + $attrib);
	}

	/**
	* Returns table with message headers
	*/
	public static function message_headers($attrib, $headers = null)
	{
	static $sa_attrib;

	// keep header table attrib
	if (is_array($attrib) && !$sa_attrib && empty($attrib['valueof'])) {
	$sa_attrib = $attrib;
	}
	else if (!is_array($attrib) && is_array($sa_attrib)) {
	$attrib = $sa_attrib;
	}

	if (!isset(self::$MESSAGE)) {
	return false;
	}

	$rcmail = rcmail::get_instance();

	// get associative array of headers object
	if (!$headers) {
	$headers_obj = self::$MESSAGE->headers;
	$headers = get_object_vars(self::$MESSAGE->headers);
	}
	else if (is_object($headers)) {
	$headers_obj = $headers;
	$headers = get_object_vars($headers_obj);
	}
	else {
	$headers_obj = rcube_message_header::from_array($headers);
	}

	// show these headers
	$standard_headers = ['subject', 'from', 'sender', 'to', 'cc', 'bcc', 'replyto',
	'mail-reply-to', 'mail-followup-to', 'date', 'priority'];
	$exclude_headers = !empty($attrib['exclude']) ? explode(',', $attrib['exclude']) : [];
	$output_headers = [];

	$attr_max = isset($attrib['max']) ? $attrib['max'] : null;
	$attr_addicon = isset($attrib['addicon']) ? $attrib['addicon'] : null;
	$charset = !empty($headers['charset']) ? $headers['charset'] : null;

	foreach ($standard_headers as $hkey) {
	$value = null;
	if (!empty($headers[$hkey])) {
	$value = $headers[$hkey];
	}
	else if (!empty($headers['others'][$hkey])) {
	$value = $headers['others'][$hkey];
	}
	else if (empty($attrib['valueof'])) {
	continue;
	}

	if (in_array($hkey, $exclude_headers)) {
	continue;
	}

	$ishtml = false;
	$header_title = $rcmail->gettext(preg_replace('/(^mail-\|-)/', '', $hkey));

	if ($hkey == 'date') {
	$header_value = $rcmail->format_date($value,
	self::$PRINT_MODE ? $rcmail->config->get('date_long', 'x') : null);
	}
	else if ($hkey == 'priority') {
	if ($value) {
	$header_value = html::span('prio' . $value, rcube::Q(self::localized_priority($value)));
	$ishtml = true;
	}
	else {
	continue;
	}
	}
	else if ($hkey == 'replyto') {
	if ($headers['replyto'] != $headers['from']) {
	$header_value = self::address_string($value, $attr_max, true, $attr_addicon, $charset, $header_title);
	$ishtml = true;
	}
	else {
	continue;
	}
	}
	else if ($hkey == 'mail-reply-to') {
	if ($value
	&& (!isset($headers['mail-replyto']) \|\| $headers['mail-replyto'] != $headers['replyto'])
	&& $headers['replyto'] != $headers['from']
	) {
	$header_value = self::address_string($value, $attr_max, true, $attr_addicon, $charset, $header_title);
	$ishtml = true;
	}
	else {
	continue;
	}
	}
	else if ($hkey == 'sender') {
	if ($value && (!isset($headers['sender']) \|\| $headers['sender'] != $headers['from'])) {
	$header_value = self::address_string($value, $attr_max, true, $attr_addicon, $charset, $header_title);
	$ishtml = true;
	}
	else {
	continue;
	}
	}
	else if ($hkey == 'mail-followup-to') {
	$header_value = self::address_string($value, $attr_max, true, $attr_addicon, $charset, $header_title);
	$ishtml = true;
	}
	else if (in_array($hkey, ['from', 'to', 'cc', 'bcc'])) {
	$header_value = self::address_string($value, $attr_max, true, $attr_addicon, $charset, $header_title);
	$ishtml = true;
	}
	else if ($hkey == 'subject' && empty($value)) {
	$header_value = $rcmail->gettext('nosubject');
	}
	else {
	$value = is_array($value) ? implode(' ', $value) : $value;
	$header_value = trim(rcube_mime::decode_header($value, $charset));
	}

	if (empty($header_value)) {
	continue;
	}

	$output_headers[$hkey] = [
	'title' => $header_title,
	'value' => $header_value,
	'raw' => $value,
	'html' => $ishtml,
	];
	}

	$plugin = $rcmail->plugins->exec_hook('message_headers_output', [
	'output' => $output_headers,
	'headers' => $headers_obj,
	'exclude' => $exclude_headers, // readonly
	'folder' => self::$MESSAGE->folder, // readonly
	'uid' => self::$MESSAGE->uid, // readonly
	]);

	// single header value is requested
	if (!empty($attrib['valueof'])) {
	$row = $plugin['output'][$attrib['valueof']];
	return $row['html'] ? $row['value'] : rcube::SQ($row['value']);
	}

	// compose html table
	$table = new html_table(['cols' => 2]);

	foreach ($plugin['output'] as $hkey => $row) {
	$val = $row['html'] ? $row['value'] : rcube::SQ($row['value']);

	$table->add(['class' => 'header-title'], rcube::SQ($row['title']));
	$table->add(['class' => 'header ' . $hkey], $val);
	}

	return $table->show($attrib);
	}

	/**
	* Returns element with "From\|To <sender\|recipient> on <date>"
	*/
	public static function message_summary($attrib)
	{
	if (!isset(self::$MESSAGE) \|\| empty(self::$MESSAGE->headers)) {
	return;
	}

	$rcmail = rcmail::get_instance();
	$header = self::$MESSAGE->context ? 'from' : self::message_list_smart_column_name();
	$label = 'shortheader' . $header;
	$date = $rcmail->format_date(self::$MESSAGE->headers->date, $rcmail->config->get('date_long', 'x'));
	$user = self::$MESSAGE->headers->$header;

	if (!$user && $header == 'to' && !empty(self::$MESSAGE->headers->cc)) {
	$user = self::$MESSAGE->headers->cc;
	}
	if (!$user && $header == 'to' && !empty(self::$MESSAGE->headers->bcc)) {
	$user = self::$MESSAGE->headers->bcc;
	}

	$vars[$header] = self::address_string($user, 1, true, $attrib['addicon'], self::$MESSAGE->headers->charset);
	$vars['date'] = html::span('text-nowrap', $date);

	if (empty($user)) {
	$label = 'shortheaderdate';
	}

	$out = html::span(null, $rcmail->gettext(['name' => $label, 'vars' => $vars]));

	return html::div($attrib, $out);
	}

	/**
	* Convert Priority header value into a localized string
	*/
	public static function localized_priority($value)
	{
	$labels_map = [
	'1' => 'highest',
	'2' => 'high',
	'3' => 'normal',
	'4' => 'low',
	'5' => 'lowest',
	];

	if ($value && !empty($labels_map[$value])) {
	return rcmail::get_instance()->gettext($labels_map[$value]);
	}

	return '';
	}

	/**
	* Returns block to show full message headers
	*/
	public static function message_full_headers($attrib)
	{
	$rcmail = rcmail::get_instance();

	$html = html::div(['id' => "all-headers", 'class' => "all", 'style' => 'display:none'],
	html::div(['id' => 'headers-source'], ''));

	$html .= html::div([
	'class' => "more-headers show-headers",
	'onclick' => "return ".rcmail_output::JS_OBJECT_NAME.".command('show-headers','',this)",
	'title' => $rcmail->gettext('togglefullheaders')
	], '');

	$rcmail->output->add_gui_object('all_headers_row', 'all-headers');
	$rcmail->output->add_gui_object('all_headers_box', 'headers-source');

	return html::div($attrib, $html);
	}

	/**
	* Handler for the 'messagebody' GUI object
	*
	* @param array $attrib Named parameters
	*
	* @return string HTML content showing the message body
	*/
	public static function message_body($attrib)
	{
	if (!is_array(self::$MESSAGE->parts) && empty(self::$MESSAGE->body)) {
	return '';
	}

	if (empty($attrib['id'])) {
	$attrib['id'] = 'rcmailMsgBody';
	}

	$rcmail = rcmail::get_instance();
	$safe_mode = self::$MESSAGE->is_safe \|\| !empty($_GET['_safe']);
	$out = '';
	$part_no = 0;

	$header_attrib = [];
	foreach ($attrib as $attr => $value) {
	if (preg_match('/^headertable([a-z]+)$/i', $attr, $regs)) {
	$header_attrib[$regs[1]] = $value;
	}
	}

	if (!empty(self::$MESSAGE->parts)) {
	foreach (self::$MESSAGE->parts as $part) {
	if ($part->type == 'headers') {
	$out .= html::div('message-partheaders', self::message_headers(count($header_attrib) ? $header_attrib : null, $part->headers));
	}
	else if ($part->type == 'content') {
	// unsupported (e.g. encrypted)
	if (!empty($part->realtype)) {
	if ($part->realtype == 'multipart/encrypted' \|\| $part->realtype == 'application/pkcs7-mime') {
	if (
	!empty($_SESSION['browser_caps']['pgpmime'])
	&& ($pgp_mime_part = self::$MESSAGE->get_multipart_encrypted_part())
	) {
	$out .= html::span('part-notice', $rcmail->gettext('externalmessagedecryption'));
	$rcmail->output->set_env('pgp_mime_part', $pgp_mime_part->mime_id);
	$rcmail->output->set_env('pgp_mime_container', '#' . $attrib['id']);
	$rcmail->output->add_label('loadingdata');
	}

	if (!self::$MESSAGE->encrypted_part) {
	$out .= html::span('part-notice', $rcmail->gettext('encryptedmessage'));
	}
	}
	continue;
	}
	else if (!$part->size) {
	continue;
	}
	// Check if we have enough memory to handle the message in it
	// #1487424: we need up to 10x more memory than the body
	else if (!rcube_utils::mem_check($part->size * 10)) {
	$out .= self::part_too_big_message(self::$MESSAGE, $part->mime_id);
	continue;
	}

	// fetch part body
	$body = self::$MESSAGE->get_part_body($part->mime_id, true);

	// message is cached but not exists (#1485443), or other error
	if ($body === false) {
	// Don't bail out if it is only one-of-many part of the message (#6854)
	if (strlen($out)) {
	$out .= html::span('part-notice', $rcmail->gettext('messageopenerror'));
	continue;
	}

	self::message_error();
	}

	$plugin = $rcmail->plugins->exec_hook('message_body_prefix',
	['part' => $part, 'prefix' => '', 'message' => self::$MESSAGE]);

	// Set attributes of the part container
	$container_class = $part->ctype_secondary == 'html' ? 'message-htmlpart' : 'message-part';
	$container_id = $container_class . (++$part_no);
	$container_attrib = ['class' => $container_class, 'id' => $container_id];

	$body_args = [
	'safe' => $safe_mode,
	'plain' => !$rcmail->config->get('prefer_html'),
	'css_prefix' => 'v' . $part_no,
	'body_class' => 'rcmBody',
	'container_id' => $container_id,
	'container_attrib' => $container_attrib,
	];

	// Parse the part content for display
	$body = self::print_body($body, $part, $body_args);

	// check if the message body is PGP encrypted
	if (strpos($body, '-----BEGIN PGP MESSAGE-----') !== false) {
	$rcmail->output->set_env('is_pgp_content', '#' . $container_id);
	}

	if ($part->ctype_secondary == 'html') {
	$body = self::html4inline($body, $body_args);
	}

	$out .= html::div($body_args['container_attrib'], $plugin['prefix'] . $body);
	}
	}
	}
	else {
	// Check if we have enough memory to handle the message in it
	// #1487424: we need up to 10x more memory than the body
	if (!rcube_utils::mem_check(strlen(self::$MESSAGE->body) * 10)) {
	$out .= self::part_too_big_message(self::$MESSAGE, 0);
	}
	else {
	$plugin = $rcmail->plugins->exec_hook('message_body_prefix',
	['part' => self::$MESSAGE, 'prefix' => '']);

	$out .= html::div('message-part',
	$plugin['prefix'] . self::plain_body(self::$MESSAGE->body));
	}
	}

	// list images after mail body
	if ($rcmail->config->get('inline_images', true) && !empty(self::$MESSAGE->attachments)) {
	$thumbnail_size = $rcmail->config->get('image_thumbnail_size', 240);
	$show_label = rcube::Q($rcmail->gettext('showattachment'));
	$download_label = rcube::Q($rcmail->gettext('download'));

	foreach (self::$MESSAGE->attachments as $attach_prop) {
	// skip inline images
	if (!empty($attach_prop->content_id) && $attach_prop->disposition == 'inline') {
	continue;
	}

	// Content-Type: image/*...
	if ($mimetype = self::part_image_type($attach_prop)) {
	// display thumbnails
	if ($thumbnail_size) {
	$supported = in_array($mimetype, self::$CLIENT_MIMETYPES);
	$show_link_attr = [
	'href' => self::$MESSAGE->get_part_url($attach_prop->mime_id, false),
	'onclick' => sprintf(
	'return %s.command(\'load-attachment\',\'%s\',this)',
	rcmail_output::JS_OBJECT_NAME,
	$attach_prop->mime_id
	)
	];
	$download_link_attr = [
	'href' => $show_link_attr['href'] . '&_download=1',
	];
	$show_link = html::a($show_link_attr + ['class' => 'open'], $show_label);
	$download_link = html::a($download_link_attr + ['class' => 'download'], $download_label);

	$out .= html::p(['class' => 'image-attachment', 'style' => $supported ? '' : 'display:none'],
	html::a($show_link_attr + ['class' => 'image-link', 'style' => sprintf('width:%dpx', $thumbnail_size)],
	html::img([
	'class' => 'image-thumbnail',
	'src' => self::$MESSAGE->get_part_url($attach_prop->mime_id, 'image') . '&_thumb=1',
	'title' => $attach_prop->filename,
	'alt' => $attach_prop->filename,
	'style' => sprintf('max-width:%dpx; max-height:%dpx', $thumbnail_size, $thumbnail_size),
	'onload' => $supported ? '' : '$(this).parents(\'p.image-attachment\').show()',
	])
	) .
	html::span('image-filename', rcube::Q($attach_prop->filename)) .
	html::span('image-filesize', rcube::Q(self::message_part_size($attach_prop))) .
	html::span('attachment-links', ($supported ? $show_link . ' ' : '') . $download_link) .
	html::br(['style' => 'clear:both'])
	);
	}
	else {
	$out .= html::tag('fieldset', 'image-attachment',
	html::tag('legend', 'image-filename', rcube::Q($attach_prop->filename)) .
	html::p(['align' => 'center'],
	html::img([
	'src' => self::$MESSAGE->get_part_url($attach_prop->mime_id, 'image'),
	'title' => $attach_prop->filename,
	'alt' => $attach_prop->filename,
	])
	)
	);
	}
	}
	}
	}

	// tell client that there are blocked remote objects
	if (self::$REMOTE_OBJECTS && !$safe_mode) {
	$rcmail->output->set_env('blockedobjects', true);
	}

	$rcmail->output->add_gui_object('messagebody', $attrib['id']);

	return html::div($attrib, $out);
	}

	/**
	* Returns a HTML notice element for too big message parts
	*/
	public static function part_too_big_message($MESSAGE, $part_id)
	{
	$rcmail = rcmail::get_instance();
	$token = $rcmail->get_request_token();
	$url = $rcmail->url([
	'task' => 'mail',
	'action' => 'get',
	'download' => 1,
	'uid' => $MESSAGE->uid,
	'part' => $part_id,
	'mbox' => $MESSAGE->folder,
	'token' => $token,
	]);

	return html::span('part-notice', $rcmail->gettext('messagetoobig') . ' ' . html::a($url, $rcmail->gettext('download')));
	}

	/**
	* Handle disposition notification requests
	*/
	public static function mdn_request_handler($message)
	{
	$rcmail = rcmail::get_instance();

	if ($message->headers->mdn_to
	&& $message->context === null
	&& !empty($message->sender['mailto'])
	&& empty($message->headers->flags['MDNSENT'])
	&& empty($message->headers->flags['SEEN'])
	&& ($rcmail->storage->check_permflag('MDNSENT') \|\| $rcmail->storage->check_permflag('*'))
	&& $message->folder != $rcmail->config->get('drafts_mbox')
	&& $message->folder != $rcmail->config->get('sent_mbox')
	) {
	$mdn_cfg = intval($rcmail->config->get('mdn_requests'));
	$exists = $mdn_cfg == 1;

	// Check sender existence in contacts
	// 3 and 4 = my contacts, 5 and 6 = trusted senders
	if ($mdn_cfg == 3 \|\| $mdn_cfg == 4 \|\| $mdn_cfg == 5 \|\| $mdn_cfg == 6) {
	$type = rcube_addressbook::TYPE_TRUSTED_SENDER;

	if ($mdn_cfg == 3 \|\| $mdn_cfg == 4) {
	$type \|= rcube_addressbook::TYPE_WRITEABLE \| rcube_addressbook::TYPE_RECIPIENT;
	}

	if ($rcmail->contact_exists($message->sender['mailto'], $type)) {
	$exists = 1;
	}
	}

	if ($exists) {
	// Send MDN
	if (rcmail_action_mail_sendmdn::send_mdn($message, $smtp_error)) {
	$rcmail->output->show_message('receiptsent', 'confirmation');
	}
	else if ($smtp_error && is_string($smtp_error)) {
	$rcmail->output->show_message($smtp_error, 'error');
	}
	else if ($smtp_error && !empty($smtp_error['label'])) {
	$rcmail->output->show_message($smtp_error['label'], 'error', $smtp_error['vars']);
	}
	else {
	$rcmail->output->show_message('errorsendingreceipt', 'error');
	}
	}
	else if ($mdn_cfg != 2 && $mdn_cfg != 4 && $mdn_cfg != 6) {
	// Ask the user
	$rcmail->output->add_label('sendreceipt', 'mdnrequest', 'send', 'sendalwaysto', 'ignore');
	$rcmail->output->set_env('mdn_request_save', $mdn_cfg == 3 \|\| $mdn_cfg == 5 ? $mdn_cfg : 0);
	$rcmail->output->set_env('mdn_request_sender', $message->sender);
	$rcmail->output->set_env('mdn_request', true);
	}
	}
	}
	}

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