rcmail_sendmail.php
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rcmail_sendmail.php
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	<?php

	/**
	+-----------------------------------------------------------------------+
	\| program/include/rcmail_sendmail.inc \|
	\| \|
	\| This file is part of the Roundcube Webmail client \|
	\| Copyright (C) 2005-2017, 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: \|
	\| Common code for generating and saving/sending mail message \|
	\| with support for common user interface elements \|
	+-----------------------------------------------------------------------+
	\| Author: Thomas Bruederli <roundcube@gmail.com> \|
	\| Author: Aleksander Machniak <alec@alec.pl> \|
	+-----------------------------------------------------------------------+
	*/

	/**
	* Common code for generating and saving/sending mail message
	* with support for common user interface elements.
	*
	* @package Webmail
	*/
	class rcmail_sendmail
	{
	public $data = array();
	public $options = array();

	protected $parse_data = array();
	protected $compose_form;

	// define constants for message compose mode
	const MODE_REPLY = 'reply';
	const MODE_FORWARD = 'forward';
	const MODE_DRAFT = 'draft';
	const MODE_EDIT = 'edit';


	/**
	* Object constructor
	*
	* @param array $data Compose data
	* @param array $options Operation options:
	* savedraft (bool) - Enable save-draft mode
	* sendmail (bool) - Enable send-mail mode
	* saveonly (bool) - Enable save-only mode
	* message (object) - Message object to get some data from
	* error_handler (callback) - Error handler
	*/
	public function __construct($data = array(), $options = array())
	{
	$this->rcmail = rcube::get_instance();
	$this->data = (array) $data;
	$this->options = (array) $options;

	$this->options['sendmail_delay'] = (int) $this->rcmail->config->get('sendmail_delay');

	if (empty($options['error_handler'])) {
	$this->options['error_handler'] = function() { return false; };
	}

	if ($this->options['message']) {
	$this->compose_init($this->options['message']);
	}
	}

	/**
	* Collect input data for message headers
	*
	* @return array Message headers
	*/
	public function headers_input()
	{
	if ($this->options['sendmail'] && $this->options['sendmail_delay']) {
	$last_time = $this->rcmail->config->get('last_message_time');
	$wait_sec = time() - $this->options['sendmail_delay'] - intval($last_time);

	if ($wait_sec < 0) {
	return $this->options['error_handler']('senttooquickly', 'error', array('sec' => $wait_sec * -1));
	}
	}

	// set default charset
	if (!($charset = $this->options['charset'])) {
	$charset = rcube_utils::get_input_value('_charset', rcube_utils::INPUT_POST) ?: $this->rcmail->output->get_charset();
	$this->options['charset'] = $charset;
	}

	$this->parse_data = array();

	$mailto = $this->email_input_format(rcube_utils::get_input_value('_to', rcube_utils::INPUT_POST, true, $charset), true);
	$mailcc = $this->email_input_format(rcube_utils::get_input_value('_cc', rcube_utils::INPUT_POST, true, $charset), true);
	$mailbcc = $this->email_input_format(rcube_utils::get_input_value('_bcc', rcube_utils::INPUT_POST, true, $charset), true);

	if ($this->parse_data['INVALID_EMAIL'] && !$this->options['savedraft']) {
	return $this->options['error_handler']('emailformaterror', 'error', array('email' => $this->parse_data['INVALID_EMAIL']));
	}

	if (($max_recipients = (int) $this->rcmail->config->get('max_recipients')) > 0) {
	if ($this->parse_data['RECIPIENT_COUNT'] > $max_recipients) {
	return $this->options['error_handler']('toomanyrecipients', 'error', array('max' => $max_recipients));
	}
	}

	if (empty($mailto) && !empty($mailcc)) {
	$mailto = $mailcc;
	$mailcc = null;
	}
	else if (empty($mailto)) {
	$mailto = 'undisclosed-recipients:;';
	}

	$dont_override = (array) $this->rcmail->config->get('dont_override');
	$mdn_enabled = in_array('mdn_default', $dont_override) ? $this->rcmail->config->get('mdn_default') : !empty($_POST['_mdn']);
	$dsn_enabled = in_array('dsn_default', $dont_override) ? $this->rcmail->config->get('dsn_default') : !empty($_POST['_dsn']);
	$subject = rcube_utils::get_input_value('_subject', rcube_utils::INPUT_POST, true, $charset);
	$from = rcube_utils::get_input_value('_from', rcube_utils::INPUT_POST, true, $charset);
	$replyto = rcube_utils::get_input_value('_replyto', rcube_utils::INPUT_POST, true, $charset);
	$followupto = rcube_utils::get_input_value('_followupto', rcube_utils::INPUT_POST, true, $charset);

	// Get sender name and address from identity...
	if (is_numeric($from)) {
	if (is_array($identity_arr = $this->get_identity($from))) {
	if ($identity_arr['mailto']) {
	$from = $identity_arr['mailto'];
	}
	if ($identity_arr['string']) {
	$from_string = $identity_arr['string'];
	}
	}
	else {
	$from = null;
	}
	}
	// ... if there is no identity record, this might be a custom from
	else if (($from_string = $this->email_input_format($from))
	&& preg_match('/(\S+@\S+)/', $from_string, $m)
	) {
	$from = trim($m[1], '<>');
	}
	// ... otherwise it's empty or invalid
	else {
	$from = null;
	}

	// check 'From' address (identity may be incomplete)
	if (!$this->options['savedraft'] && !$this->options['saveonly'] && empty($from)) {
	return $this->options['error_handler']('nofromaddress', 'error');
	}

	if (!$from_string && $from) {
	$from_string = $from;
	}

	$from_string = rcube_charset::convert($from_string, RCUBE_CHARSET, $charset);
	$message_id = $this->data['param']['message-id'];

	if (!$message_id) {
	$message_id = $this->rcmail->gen_message_id($from);
	}

	$this->options['dsn_enabled'] = $dsn_enabled;
	$this->options['from'] = $from;
	$this->options['mailto'] = $mailto;

	// compose headers array
	$headers = array(
	'Received' => $this->header_received(),
	'Date' => $this->rcmail->user_date(),
	'From' => $from_string,
	'To' => $mailto,
	'Cc' => $mailcc,
	'Bcc' => $mailbcc,
	'Subject' => trim($subject),
	'Reply-To' => $this->email_input_format($replyto),
	'Mail-Reply-To' => $headers['Reply-To'],
	'Mail-Followup-To' => $this->email_input_format($followupto),
	'In-Reply-To' => $this->data['reply_msgid'],
	'References' => $this->data['references'],
	'User-Agent' => $this->rcmail->config->get('useragent'),
	'Message-ID' => $message_id,
	'X-Sender' => $from,
	);

	if (!empty($identity_arr['organization'])) {
	$headers['Organization'] = $identity_arr['organization'];
	}

	if ($mdn_enabled) {
	$headers['Return-Receipt-To'] = $from_string;
	$headers['Disposition-Notification-To'] = $from_string;
	}

	if (!empty($_POST['_priority'])) {
	$priority = intval($_POST['_priority']);
	$a_priorities = array(1 => 'highest', 2 => 'high', 4 => 'low', 5 => 'lowest');

	if ($str_priority = $a_priorities[$priority]) {
	$headers['X-Priority'] = sprintf("%d (%s)", $priority, ucfirst($str_priority));
	}
	}

	// remember reply/forward UIDs in special headers
	if ($this->options['savedraft']) {
	// Note: We ignore <UID>.<PART> forwards/replies here
	if (($uid = $this->data['reply_uid']) && !preg_match('/^\d+\.[0-9.]+$/', $uid)) {
	$headers['X-Draft-Info'] = $this->draftinfo_encode(array(
	'type' => 'reply',
	'uid' => $uid,
	'folder' => $this->data['mailbox']
	));
	}
	else if (!empty($this->data['forward_uid'])
	&& ($uid = rcube_imap_generic::compressMessageSet($this->data['forward_uid']))
	&& !preg_match('/^\d+[0-9.]+$/', $uid)
	) {
	$headers['X-Draft-Info'] = $this->draftinfo_encode(array(
	'type' => 'forward',
	'uid' => $uid,
	'folder' => $this->data['mailbox']
	));
	}
	}

	return array_filter($headers);
	}

	/**
	* Set charset and transfer encoding on the message
	*
	* @param Mail_mime $message Message object
	* @param bool $flowed Enable format=flowed
	*/
	public function set_message_encoding($message, $flowed = false)
	{
	$text_charset = $this->options['charset'];
	$transfer_encoding = '7bit';
	$head_encoding = 'quoted-printable';

	// choose encodings for plain/text body and message headers
	if (preg_match('/ISO-2022/i', $text_charset)) {
	$head_encoding = 'base64'; // RFC1468
	}
	else if (preg_match('/[^\x00-\x7F]/', $message->getTXTBody())) {
	$transfer_encoding = $this->rcmail->config->get('force_7bit') ? 'quoted-printable' : '8bit';
	}
	else if ($message_charset == 'UTF-8') {
	$text_charset = 'US-ASCII';
	}

	if ($flowed) {
	$text_charset .= ";\r\n format=flowed";
	}

	// encoding settings for mail composing
	$message->setParam('text_encoding', $transfer_encoding);
	$message->setParam('html_encoding', 'quoted-printable');
	$message->setParam('head_encoding', $head_encoding);
	$message->setParam('head_charset', $this->options['charset']);
	$message->setParam('html_charset', $this->options['charset']);
	$message->setParam('text_charset', $text_charset);
	}

	/**
	* Create a message to be saved/sent
	*
	* @param array $headers Message headers
	* @param string $body Message body
	* @param bool $isHtml The body is HTML or not
	* @param array $attachments Optional message attachments array
	*
	* @return Mail_mime Message object
	*/
	public function create_message($headers, $body, $isHtml = false, $attachments = array())
	{
	// set line length for body wrapping
	$line_length = $this->rcmail->config->get('line_length', 72);
	$charset = $this->options['charset'];
	$flowed = $this->options['savedraft'] \|\| $this->rcmail->config->get('send_format_flowed', true);

	// create PEAR::Mail_mime instance
	$MAIL_MIME = new Mail_mime("\r\n");

	// Check if we have enough memory to handle the message in it
	// It's faster than using files, so we'll do this if we only can
	if (is_array($attachments) && ($mem_limit = parse_bytes(ini_get('memory_limit')))) {
	$memory = 0;
	foreach ($attachments as $id => $attachment) {
	$memory += $attachment['size'];
	}

	// Yeah, Net_SMTP needs up to 12x more memory, 1.33 is for base64
	if (!rcube_utils::mem_check($memory * 1.33 * 12)) {
	$MAIL_MIME->setParam('delay_file_io', true);
	}
	}

	$plugin = $this->rcmail->plugins->exec_hook('message_outgoing_body', array(
	'body' => $body,
	'type' => $isHtml ? 'html' : 'plain',
	'message' => $MAIL_MIME
	));

	// For HTML-formatted messages, construct the MIME message with both
	// the HTML part and the plain-text part
	if ($isHtml) {
	$MAIL_MIME->setHTMLBody($plugin['body']);

	$plain_body = $this->rcmail->html2text($plugin['body'], array('width' => 0, 'charset' => $charset));
	$plain_body = rcube_mime::wordwrap($plain_body, $line_length, "\r\n", false, $charset);
	$plain_body = wordwrap($plain_body, 998, "\r\n", true);

	// There's no sense to use multipart/alternative if the text/plain
	// part would be blank. Completely blank text/plain part may confuse
	// some mail clients (#5283)
	if (strlen(trim($plain_body)) > 0) {
	// make sure all line endings are CRLF (#1486712)
	$plain_body = preg_replace('/\r?\n/', "\r\n", $plain_body);

	$plugin = $this->rcmail->plugins->exec_hook('message_outgoing_body', array(
	'body' => $plain_body,
	'type' => 'alternative',
	'message' => $MAIL_MIME
	));

	// add a plain text version of the e-mail as an alternative part.
	$MAIL_MIME->setTXTBody($plugin['body']);
	}

	// Extract image Data URIs into message attachments (#1488502)
	$this->extract_inline_images($MAIL_MIME, $this->options['from']);
	}
	else {
	$body = $plugin['body'];

	// compose format=flowed content if enabled
	if ($flowed) {
	$body = rcube_mime::format_flowed($body, min($line_length + 2, 79), $charset);
	}
	else {
	$body = rcube_mime::wordwrap($body, $line_length, "\r\n", false, $charset);
	}

	$body = wordwrap($body, 998, "\r\n", true);

	$MAIL_MIME->setTXTBody($body, false, true);
	}

	// encoding settings for mail composing
	$this->set_message_encoding($MAIL_MIME, $flowed);

	// pass headers to message object
	$MAIL_MIME->headers($headers);

	return $MAIL_MIME;
	}

	/**
	* Message delivery, and setting Replied/Forwarded flag on success
	*
	* @param Mail_mime $message Message object
	*/
	public function deliver_message($message)
	{
	// Handle Delivery Status Notification request
	$smtp_opts = array('dsn' => $this->options['dsn_enabled']);

	$sent = $this->rcmail->deliver_message($message,
	$this->options['from'],
	$this->options['mailto'],
	$smtp_error, $mailbody_file, $smtp_opts, true
	);

	// return to compose page if sending failed
	if (!$sent) {
	// remove temp file
	if ($mailbody_file) {
	unlink($mailbody_file);
	}

	if ($smtp_error && is_string($smtp_error)) {
	return $this->options['error_handler']($smtp_error, 'error');
	}
	else if ($smtp_error && !empty($smtp_error['label'])) {
	return $this->options['error_handler']($smtp_error['label'], 'error', $smtp_error['vars']);
	}
	else {
	return $this->options['error_handler']('sendingfailed', 'error');
	}
	}

	$message->mailbody_file = $mailbody_file;

	// save message sent time
	if ($this->options['sendmail_delay']) {
	$this->rcmail->user->save_prefs(array('last_message_time' => time()));
	}

	// set replied/forwarded flag
	if ($this->data['reply_uid']) {
	foreach (rcmail::get_uids($this->data['reply_uid'], $this->data['mailbox']) as $mbox => $uids) {
	// skip <UID>.<PART> replies
	if (!preg_match('/^\d+\.[0-9.]+$/', implode(',', (array) $uids))) {
	$this->rcmail->storage->set_flag($uids, 'ANSWERED', $mbox);
	}
	}
	}
	else if ($this->data['forward_uid']) {
	foreach (rcmail::get_uids($this->data['forward_uid'], $this->data['mailbox']) as $mbox => $uids) {
	// skip <UID>.<PART> forwards
	if (!preg_match('/^\d+\.[0-9.]+$/', implode(',', (array) $uids))) {
	$this->rcmail->storage->set_flag($uids, 'FORWARDED', $mbox);
	}
	}
	}
	}

	/**
	* Save the message into Drafts folder (in savedraft mode)
	* or in Sent mailbox if specified/configured
	*
	* @param Mail_mime $message Message object
	*
	* @return mixed Operation status
	*/
	public function save_message($message)
	{
	// Determine which folder to save message
	if ($this->options['savedraft']) {
	$store_target = $this->rcmail->config->get('drafts_mbox');
	}
	else if (!$this->rcmail->config->get('no_save_sent_messages')) {
	if (isset($_POST['_store_target'])) {
	$store_target = rcube_utils::get_input_value('_store_target', rcube_utils::INPUT_POST, true);
	}
	else {
	$store_target = $this->rcmail->config->get('sent_mbox');
	}
	}

	if ($store_target) {
	$storage = $this->rcmail->get_storage();

	// check if folder is subscribed
	if ($storage->folder_exists($store_target, true)) {
	$store_folder = true;
	}
	// folder may be existing but not subscribed (#1485241)
	else if (!$storage->folder_exists($store_target)) {
	$store_folder = $storage->create_folder($store_target, true);
	}
	else if ($storage->subscribe($store_target)) {
	$store_folder = true;
	}

	// append message to sent box
	if ($store_folder) {
	// message body in file
	if ($message->mailbody_file \|\| $message->getParam('delay_file_io')) {
	$headers = $message->txtHeaders();

	// file already created
	if ($message->mailbody_file) {
	$msg = $message->mailbody_file;
	}
	else {
	$temp_dir = $this->rcmail->config->get('temp_dir');
	$mailbody_file = tempnam($temp_dir, 'rcmMsg');
	$msg = $message->saveMessageBody($mailbody_file);

	if (!is_a($msg, 'PEAR_Error')) {
	$msg = $mailbody_file;
	}
	}
	}
	else {
	$msg = $message->getMessage();
	$headers = '';
	}

	if (is_a($msg, 'PEAR_Error')) {
	rcube::raise_error(array(
	'code' => 650, 'file' => __FILE__, 'line' => __LINE__,
	'message' => "Could not create message: ".$msg->getMessage()),
	true, false);
	}
	else {
	$saved = $storage->save_message($store_target, $msg, $headers,
	$message->mailbody_file ? true : false, array('SEEN'));
	}
	}

	// raise error if saving failed
	if (!$saved) {
	rcube::raise_error(array('code' => 800, 'type' => 'imap',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Could not save message in $store_target"), true, false);
	}
	}

	if ($message->mailbody_file) {
	unlink($message->mailbody_file);
	unset($message->mailbody_file);
	}

	$this->options['store_target'] = $store_target;
	$this->options['store_folder'] = $store_folder;

	return $saved;
	}

	/**
	* If enabled, returns Received header content to be prepended
	* to message headers
	*
	* @return string Received header content
	*/
	public function header_received()
	{
	if ($this->rcmail->config->get('http_received_header')) {
	$nldlm = "\r\n\t";
	$http_header = 'from ';

	// FROM/VIA
	if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
	$hosts = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR'], 2);
	$http_header .= $this->received_host($hosts[0]) . $nldlm . ' via ';
	}

	$http_header .= $this->received_host($_SERVER['REMOTE_ADDR']);

	// BY
	$http_header .= $nldlm . 'by ' . rcube_utils::server_name('HTTP_HOST');

	// WITH
	$http_header .= $nldlm . 'with HTTP (' . $_SERVER['SERVER_PROTOCOL']
	. ' ' . $_SERVER['REQUEST_METHOD'] . '); ' . date('r');

	return wordwrap($http_header, 69, $nldlm);
	}
	}

	/**
	* Converts host address into host spec. for Received header
	*/
	protected function received_host($host)
	{
	$hostname = gethostbyaddr($host);
	$result = $this->encrypt_host($hostname);

	if ($host != $hostname) {
	$result .= ' (' . $this->encrypt_host($host) . ')';
	}

	return $result;
	}

	/**
	* Encrypt host IP or hostname for Received header
	*/
	protected function encrypt_host($host)
	{
	if ($this->rcmail->config->get('http_received_header_encrypt')) {
	return $this->rcmail->encrypt($host);
	}

	if (!preg_match('/[^0-9:.]/', $host)) {
	return "[$host]";
	}

	return $host;
	}

	/**
	* Returns user identity record
	*
	* @param int $id Identity ID
	*
	* @return array User identity data
	*/
	public function get_identity($id)
	{
	if ($sql_arr = $this->rcmail->user->get_identity($id)) {
	$out = $sql_arr;

	if ($this->options['charset'] != RCUBE_CHARSET) {
	foreach ($out as $k => $v) {
	$out[$k] = rcube_charset::convert($v, RCUBE_CHARSET, $this->options['charset']);
	}
	}

	$out['mailto'] = $sql_arr['email'];
	$out['string'] = format_email_recipient($sql_arr['email'], $sql_arr['name']);

	return $out;
	}

	return false;
	}

	/**
	* Extract image attachments from HTML message (data URIs)
	*
	* @param Mail_mime $message Message object
	* @param string $from Sender email address
	*/
	public static function extract_inline_images($message, $from)
	{
	$body = $message->getHTMLBody();
	$offset = 0;
	$list = array();
	$domain = 'localhost';
	$regexp = '#img[^>]+src=[\'"](data:([^;]*);base64,([a-z0-9+/=\r\n]+))([\'"])#i';

	if (preg_match_all($regexp, $body, $matches, PREG_OFFSET_CAPTURE)) {
	// get domain for the Content-ID, must be the same as in Mail_Mime::get()
	if (preg_match('#@([0-9a-zA-Z\-\.]+)#', $from, $m)) {
	$domain = $m[1];
	}

	foreach ($matches[1] as $idx => $m) {
	$data = preg_replace('/\r\n/', '', $matches[3][$idx][0]);
	$data = base64_decode($data);

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

	$hash = md5($data) . '@' . $domain;
	$mime_type = $matches[2][$idx][0];
	$name = $list[$hash];

	if (empty($mime_type)) {
	$mime_type = rcube_mime::image_content_type($data);
	}

	// add the image to the MIME message
	if (!$name) {
	$ext = preg_replace('#^[^/]+/#', '', $mime_type);
	$name = substr($hash, 0, 8) . '.' . $ext;
	$list[$hash] = $name;

	$message->addHTMLImage($data, $mime_type, $name, false, $hash);
	}

	$body = substr_replace($body, $name, $m[1] + $offset, strlen($m[0]));
	$offset += strlen($name) - strlen($m[0]);
	}
	}

	$message->setHTMLBody($body);
	}

	/**
	* Parse and cleanup email address input (and count addresses)
	*
	* @param string $mailto Address input
	* @param boolean $count Do count recipients (count saved in $this->parse_data['RECIPIENT_COUNT'])
	* @param boolean $check Validate addresses (errors saved in $this->parse_data['INVALID_EMAIL'])
	*
	* @return string Canonical recipients string (comma separated)
	*/
	public function email_input_format($mailto, $count = false, $check = true)
	{
	// simplified email regexp, supporting quoted local part
	$email_regexp = '(\S+\|("[^"]+"))@\S+';

	$delim = ',;';
	$regexp = array("/[$delim]\s[\r\n]+/", '/[\r\n]+/', "/[$delim]\s\$/m", '/;/', '/(\S{1})(<'.$email_regexp.'>)/U');
	$replace = array(', ', ', ', '', ',', '\\1 \\2');

	// replace new lines and strip ending ', ', make address input more valid
	$mailto = trim(preg_replace($regexp, $replace, $mailto));
	$items = rcube_utils::explode_quoted_string("[$delim]", $mailto);
	$result = array();

	foreach ($items as $item) {
	$item = trim($item);
	// address in brackets without name (do nothing)
	if (preg_match('/^<'.$email_regexp.'>$/', $item)) {
	$item = rcube_utils::idn_to_ascii(trim($item, '<>'));
	$result[] = $item;
	}
	// address without brackets and without name (add brackets)
	else if (preg_match('/^'.$email_regexp.'$/', $item)) {
	$item = rcube_utils::idn_to_ascii($item);
	$result[] = $item;
	}
	// address with name (handle name)
	else if (preg_match('/<'.$email_regexp.'>$/', $item, $matches)) {
	$address = $matches[0];
	$name = trim(str_replace($address, '', $item));
	if ($name[0] == '"' && $name[strlen($name)-1] == '"') {
	$name = substr($name, 1, -1);
	}
	$name = stripcslashes($name);
	$address = rcube_utils::idn_to_ascii(trim($address, '<>'));
	$result[] = format_email_recipient($address, $name);
	$item = $address;
	}

	// check address format
	$item = trim($item, '<>');
	if ($item && $check && !rcube_utils::check_email($item)) {
	$this->parse_data['INVALID_EMAIL'] = $item;
	return;
	}
	}

	if ($count) {
	$this->parse_data['RECIPIENT_COUNT'] += count($result);
	}

	return implode(', ', $result);
	}

	/**
	* Returns configured generic message footer
	*
	* @param bool $isHtml Return HTML or Plain text version of the footer?
	*
	* @return string Footer content
	*/
	public function generic_message_footer($isHtml)
	{
	if ($isHtml && ($file = $this->rcmail->config->get('generic_message_footer_html'))) {
	$html_footer = true;
	}
	else {
	$file = $this->rcmail->config->get('generic_message_footer');
	$html_footer = false;
	}

	if ($file && realpath($file)) {
	// sanity check
	if (!preg_match('/\.(php\|ini\|conf)$/', $file) && strpos($file, '/etc/') === false) {
	$footer = file_get_contents($file);
	if ($isHtml && !$html_footer) {
	$t2h = new rcube_text2html($footer, false);
	$footer = $t2h->get_html();
	}

	if ($this->options['charset'] && $this->options['charset'] != RCUBE_CHARSET) {
	$footer = rcube_charset::convert($footer, RCUBE_CHARSET, $this->options['charset']);
	}

	return $footer;
	}
	}

	return false;
	}

	/**
	* Encode data array into a string for use in X-Draft-Info header
	*
	* @param array $data Data array
	*
	* @return string Decoded data as a string
	*/
	public static function draftinfo_encode($data)
	{
	$parts = array();
	foreach ($data as $key => $val) {
	$encode = $key == 'folder' \|\| strpos($val, ';') !== false;
	$parts[] = $key . '=' . ($encode ? 'B::' . base64_encode($val) : $val);
	}

	return join('; ', $parts);
	}

	/**
	* Decode X-Draft-Info header value into an array
	*
	* @param string $str Encoded data string (see self::draftinfo_encode())
	*
	* @return array Decoded data
	*/
	public static function draftinfo_decode($str)
	{
	$info = array();

	foreach (preg_split('/;\s+/', $str) as $part) {
	list($key, $val) = explode('=', $part, 2);
	if (strpos($val, 'B::') === 0) {
	$val = base64_decode(substr($val, 3));
	}
	else if ($key == 'folder') {
	$val = base64_decode($val);
	}

	$info[$key] = $val;
	}

	return $info;
	}

	/**
	* Header (From, To, Cc, etc.) input object for templates
	*/
	public function headers_output($attrib)
	{
	list($form_start,) = $this->form_tags($attrib);

	$out = '';
	$part = strtolower($attrib['part']);

	switch ($part) {
	case 'from':
	return $form_start . $this->compose_header_from($attrib);

	case 'to':
	case 'cc':
	case 'bcc':
	$fname = '_' . $part;
	$header = $param = $part;

	$allow_attrib = array('id', 'class', 'style', 'cols', 'rows', 'tabindex');
	$field_type = 'html_textarea';
	break;

	case 'replyto':
	case 'reply-to':
	$fname = '_replyto';
	$param = 'replyto';
	$header = 'reply-to';

	case 'followupto':
	case 'followup-to':
	if (!$fname) {
	$fname = '_followupto';
	$param = 'followupto';
	$header = 'mail-followup-to';
	}

	$allow_attrib = array('id', 'class', 'style', 'size', 'tabindex');
	$field_type = 'html_inputfield';
	break;
	}

	if ($fname && $field_type) {
	// pass the following attributes to the form class
	$field_attrib = array('name' => $fname, 'spellcheck' => 'false');
	foreach ($attrib as $attr => $value) {
	if (stripos($attr, 'data-') === 0 \|\| in_array($attr, $allow_attrib)) {
	$field_attrib[$attr] = $value;
	}
	}

	// create teaxtarea object
	$input = new $field_type($field_attrib);
	$out = $input->show($this->compose_header_value($param, $this->data['mode']));
	}

	if ($form_start) {
	$out = $form_start . $out;
	}

	// configure autocompletion
	$this->rcmail->autocomplete_init();

	return $out;
	}

	/**
	* Returns From header input element
	*/
	protected function compose_header_from($attrib)
	{
	// pass the following attributes to the form class
	$field_attrib = array('name' => '_from');
	foreach ($attrib as $attr => $value) {
	if (in_array($attr, array('id', 'class', 'style', 'size', 'tabindex'))) {
	$field_attrib[$attr] = $value;
	}
	}

	if (!empty($this->options['message']->identities)) {
	$a_signatures = array();
	$identities = array();
	$top_posting = intval($this->rcmail->config->get('reply_mode')) > 0
	&& !$this->rcmail->config->get('sig_below')
	&& ($this->data['mode'] == self::MODE_REPLY \|\| $this->data['mode'] == self::MODE_FORWARD);

	$separator = $top_posting ? '---' : '-- ';
	$add_separator = (bool) $this->rcmail->config->get('sig_separator');

	$field_attrib['onchange'] = rcmail_output::JS_OBJECT_NAME . ".change_identity(this)";
	$select_from = new html_select($field_attrib);

	// create SELECT element
	foreach ($this->options['message']->identities as $sql_arr) {
	$identity_id = $sql_arr['identity_id'];
	$select_from->add(format_email_recipient($sql_arr['email'], $sql_arr['name']), $identity_id);

	// add signature to array
	if (!empty($sql_arr['signature']) && empty($this->data['param']['nosig'])) {
	$text = $html = $sql_arr['signature'];

	if ($sql_arr['html_signature']) {
	$text = $this->rcmail->html2text($html, array('links' => false));
	$text = trim($text, "\r\n");
	}
	else {
	$t2h = new rcube_text2html($text, false);
	$html = $t2h->get_html();
	}

	if ($add_separator && !preg_match('/^--[ -]\r?\n/m', $text)) {
	$text = $separator . "\n" . ltrim($text, "\r\n");
	$html = $separator . "<br>" . $html;
	}

	$a_signatures[$identity_id]['text'] = $text;
	$a_signatures[$identity_id]['html'] = $html;
	}

	// add bcc and reply-to
	if (!empty($sql_arr['reply-to'])) {
	$identities[$identity_id]['replyto'] = $sql_arr['reply-to'];
	}
	if (!empty($sql_arr['bcc'])) {
	$identities[$identity_id]['bcc'] = $sql_arr['bcc'];
	}

	$identities[$identity_id]['email'] = $sql_arr['email'];
	}

	$out = $select_from->show($this->options['message']->compose['from']);

	// add signatures to client
	$this->rcmail->output->set_env('signatures', $a_signatures);
	$this->rcmail->output->set_env('identities', $identities);
	}
	// no identities, display text input field
	else {
	$field_attrib['class'] = 'from_address';
	$input_from = new html_inputfield($field_attrib);
	$out = $input_from->show($this->options['message']->compose['from']);
	}

	return $out;
	}

	/**
	* Set the value of specified header depending on compose mode
	*/
	protected function compose_header_value($header, $mode)
	{
	$fvalue = '';
	$decode_header = true;
	$message = $this->options['message'];
	$charset = $message->headers->charset;
	$separator = ', ';

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

	// make session to not grow up too much
	$this->rcmail->session->remove("mailto.$mailto_id");
	}
	else if (!empty($_POST['_' . $header])) {
	$fvalue = rcube_utils::get_input_value('_' . $header, rcube_utils::INPUT_POST, true);
	$charset = $this->rcmail->output->charset;
	}
	else if (!empty($this->data['param'][$header])) {
	$fvalue = $this->data['param'][$header];
	$charset = $this->rcmail->output->charset;
	}
	else if ($mode == self::MODE_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 = $message->headers->get('Sender', false)) {
	// Skip common mailing lists addresses: -bounces@ and -request@ (#1490452)
	if (empty($message->headers->others['list-post'])
	\|\| !preg_match('/-(bounces\|request)@/', $v)
	) {
	$fvalue .= (!empty($fvalue) ? $separator : '') . $v;
	}
	}

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

	if (!empty($replyto) && !count(array_diff($to, $replyto)) && count(array_diff($from, $to))) {
	$fvalue .= (!empty($fvalue) ? $separator : '') . $v;
	}
	}
	}
	}
	else if (in_array($mode, array(self::MODE_DRAFT, self::MODE_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' \|\| $mode != self::MODE_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;
	}

	/**
	* Creates reply subject by removing common subject
	* prefixes/suffixes from the original message subject
	*
	* @param string $subject Subject string
	*
	* @return string Modified subject string
	*/
	public static function reply_subject($subject)
	{
	$subject = trim($subject);

	// replace Re:, Re[x]:, Re-x (#1490497)
	$prefix = '/^(re:\|re\[\d\]:\|re-\d:)\s*/i';
	do {
	$subject = preg_replace($prefix, '', $subject, -1, $count);
	}
	while ($count);

	// replace (was: ...) (#1489375)
	$subject = preg_replace('/\s$[wW]as:[^$]+\)\s$/', '', $subject);

	return 'Re: ' . $subject;
	}

	/**
	* Subject input object for templates
	*/
	public function compose_subject($attrib)
	{
	list($form_start, $form_end) = $this->form_tags($attrib);
	unset($attrib['form']);

	$attrib['name'] = '_subject';
	$attrib['spellcheck'] = 'true';

	$textfield = new html_inputfield($attrib);
	$subject = '';

	// use subject from post
	if (isset($_POST['_subject'])) {
	$subject = rcube_utils::get_input_value('_subject', rcube_utils::INPUT_POST, TRUE);
	}
	else if (!empty($this->data['param']['subject'])) {
	$subject = $this->data['param']['subject'];
	}
	// create a reply-subject
	else if ($this->data['mode'] == self::MODE_REPLY) {
	$subject = self::reply_subject($this->options['message']->subject);
	}
	// create a forward-subject
	else if ($this->data['mode'] == self::MODE_FORWARD) {
	if (preg_match('/^fwd:/i', $this->options['message']->subject)) {
	$subject = $this->options['message']->subject;
	}
	else {
	$subject = 'Fwd: ' . $this->options['message']->subject;
	}
	}
	// creeate a draft-subject
	else if ($this->data['mode'] == self::MODE_DRAFT \|\| $this->data['mode'] == self::MODE_EDIT) {
	$subject = $this->options['message']->subject;
	}

	$out = $form_start ? "$form_start\n" : '';
	$out .= $textfield->show($subject);
	$out .= $form_end ? "\n$form_end" : '';

	return $out;
	}

	/**
	* Returns compose form tag (if not used already)
	*/
	public function form_tags($attrib)
	{
	if (rcube_utils::get_boolean((string) $attrib['noform'])) {
	return array('', '');
	}

	$form_start = '';
	if (!$this->message_form) {
	$hiddenfields = new html_hiddenfield(array('name' => '_task', 'value' => $this->rcmail->task));
	$hiddenfields->add(array('name' => '_action', 'value' => 'send'));
	$hiddenfields->add(array('name' => '_id', 'value' => $this->data['id']));
	$hiddenfields->add(array('name' => '_attachments'));

	if (empty($attrib['form'])) {
	$form_attr = array('name' => "form", 'method' => "post", 'class' => $attrib['class']);
	$form_start = $this->rcmail->output->form_tag($form_attr);
	}

	$form_start .= $hiddenfields->show();
	}

	$form_end = ($this->message_form && !strlen($attrib['form'])) ? '</form>' : '';
	$form_name = $attrib['form'] ?: 'form';

	if (!$this->message_form) {
	$this->rcmail->output->add_gui_object('messageform', $form_name);
	}

	$this->message_form = $form_name;

	return array($form_start, $form_end);
	}

	/**
	* Returns compose form "head"
	*/
	public function form_head($attrib)
	{
	list($form_start,) = $this->form_tags($attrib);

	return $form_start;
	}

	/**
	* Folder selector object for templates
	*/
	public function folder_selector($attrib)
	{
	$attrib['name'] = '_store_target';
	$select = $this->rcmail->folder_selector(array_merge($attrib, array(
	'noselection' => '- ' . $this->rcmail->gettext('dontsave') . ' -',
	'folder_filter' => 'mail',
	'folder_rights' => 'w',
	)));

	return $select->show(isset($_POST['_store_target']) ? $_POST['_store_target'] : $this->data['param']['sent_mbox'], $attrib);
	}

	/**
	* Mail Disposition Notification checkbox object for templates
	*/
	public function mdn_checkbox($attrib)
	{
	list($form_start, $form_end) = $this->form_tags($attrib);
	unset($attrib['form']);

	if (!isset($attrib['id'])) {
	$attrib['id'] = 'receipt';
	}

	$attrib['name'] = '_mdn';
	$attrib['value'] = '1';

	$checkbox = new html_checkbox($attrib);

	if (isset($_POST['_mdn'])) {
	$mdn_default = $_POST['_mdn'];
	}
	else if (in_array($this->data['mode'], array(self::MODE_DRAFT, self::MODE_EDIT))) {
	$mdn_default = (bool) $this->options['message']->headers->mdn_to;
	}
	else {
	$mdn_default = $this->rcmail->config->get('mdn_default');
	}

	$out = $form_start ? "$form_start\n" : '';
	$out .= $checkbox->show($mdn_default);
	$out .= $form_end ? "\n$form_end" : '';

	return $out;
	}

	/**
	* Delivery Status Notification checkbox object for templates
	*/
	public function dsn_checkbox($attrib)
	{
	list($form_start, $form_end) = $this->form_tags($attrib);
	unset($attrib['form']);

	if (!isset($attrib['id'])) {
	$attrib['id'] = 'dsn';
	}

	$attrib['name'] = '_dsn';
	$attrib['value'] = '1';

	$checkbox = new html_checkbox($attrib);

	if (isset($_POST['_dsn'])) {
	$dsn_value = (int) $_POST['_dsn'];
	}
	else {
	$dsn_value = $this->rcmail->config->get('dsn_default');
	}

	$out = $form_start ? "$form_start\n" : '';
	$out .= $checkbox->show($dsn_value);
	$out .= $form_end ? "\n$form_end" : '';

	return $out;
	}

	/**
	* Priority selector object for templates
	*/
	public function priority_selector($attrib)
	{
	list($form_start, $form_end) = $this->form_tags($attrib);
	unset($attrib['form']);

	$attrib['name'] = '_priority';
	$prio_list = array(
	$this->rcmail->gettext('lowest') => 5,
	$this->rcmail->gettext('low') => 4,
	$this->rcmail->gettext('normal') => 0,
	$this->rcmail->gettext('high') => 2,
	$this->rcmail->gettext('highest') => 1,
	);

	$selector = new html_select($attrib);
	$selector->add(array_keys($prio_list), array_values($prio_list));

	if (isset($_POST['_priority'])) {
	$sel = (int) $_POST['_priority'];
	}
	else if (isset($this->options['message']->headers->priority)
	&& intval($this->options['message']->headers->priority) != 3
	) {
	$sel = (int) $this->options['message']->headers->priority;
	}
	else {
	$sel = 0;
	}

	$out = $form_start ? "$form_start\n" : '';
	$out .= $selector->show((int) $sel);
	$out .= $form_end ? "\n$form_end" : '';

	return $out;
	}

	/**
	* Helper to create Sent folder if not exists
	*/
	public static function check_sent_folder($folder, $create = false)
	{
	$rcmail = rcmail::get_instance();

	// we'll not save the message, so it doesn't matter
	if ($rcmail->config->get('no_save_sent_messages')) {
	return true;
	}

	if ($rcmail->storage->folder_exists($folder, true)) {
	return true;
	}

	// folder may exist but isn't subscribed (#1485241)
	if ($create) {
	if (!$rcmail->storage->folder_exists($folder))
	return $rcmail->storage->create_folder($folder, true);
	else
	return $rcmail->storage->subscribe($folder);
	}

	return false;
	}

	/**
	* Initialize mail compose UI elements
	*/
	protected function compose_init($message)
	{
	$message->compose = array();

	// get user's identities
	$message->identities = $this->rcmail->user->list_identities(null, true);

	// Set From field value
	if (!empty($_POST['_from'])) {
	$message->compose['from'] = rcube_utils::get_input_value('_from', rcube_utils::INPUT_POST);
	}
	else if (!empty($this->data['param']['from'])) {
	$message->compose['from'] = $this->data['param']['from'];
	}
	else if (!empty($message->identities)) {
	$ident = self::identity_select($message, $message->identities, $this->data['mode']);

	$message->compose['from'] = $ident['identity_id'];
	$message->compose['ident'] = $ident;
	}

	$this->rcmail->output->add_handlers(array(
	'storetarget' => array($this, 'folder_selector'),
	'composeheaders' => array($this, 'headers_output'),
	'composesubject' => array($this, 'compose_subject'),
	'priorityselector' => array($this, 'priority_selector'),
	'mdncheckbox' => array($this, 'mdn_checkbox'),
	'dsncheckbox' => array($this, 'dsn_checkbox'),
	'composeformhead' => array($this, 'form_head'),
	));

	// add some labels to client
	$this->rcmail->output->add_label('nosubject', 'nosenderwarning', 'norecipientwarning',
	'nosubjectwarning', 'cancel', 'nobodywarning', 'notsentwarning', 'savingmessage',
	'sendingmessage', 'searching', 'disclosedrecipwarning', 'disclosedreciptitle',
	'bccinstead', 'nosubjecttitle', 'sendmessage');

	$this->rcmail->output->set_env('max_disclosed_recipients', (int) $this->rcmail->config->get('max_disclosed_recipients', 5));
	}

	/**
	* Detect recipient identity from specified message
	*
	* @param rcube_message $message Message object
	* @param array $identities User identities (if NULL all user identities will be used)
	* @param string $mode Composing mode (see self::MODE_*)
	*
	* @return array Selected user identity (or the default identity) data
	*/
	public static function identity_select($message, $identities = null, $mode = null)
	{
	$a_recipients = array();
	$a_names = array();

	if ($identities === null) {
	$identities = rcmail::get_instance()->user->list_identities(null, true);
	}

	if (!$mode) {
	$mode = self::MODE_REPLY;
	}

	// extract all recipients of the reply-message
	if (is_object($message->headers) && in_array($mode, array(self::MODE_REPLY, self::MODE_FORWARD))) {
	$a_to = rcube_mime::decode_address_list($message->headers->to, null, true, $message->headers->charset);
	foreach ($a_to as $addr) {
	if (!empty($addr['mailto'])) {
	$a_recipients[] = strtolower($addr['mailto']);
	$a_names[] = $addr['name'];
	}
	}

	if (!empty($message->headers->cc)) {
	$a_cc = rcube_mime::decode_address_list($message->headers->cc, null, true, $message->headers->charset);
	foreach ($a_cc as $addr) {
	if (!empty($addr['mailto'])) {
	$a_recipients[] = strtolower($addr['mailto']);
	$a_names[] = $addr['name'];
	}
	}
	}
	}

	// decode From: address
	$from = rcube_mime::decode_address_list($message->headers->from, null, true, $message->headers->charset);
	$from = array_shift($from);
	$from['mailto'] = strtolower($from['mailto']);

	$from_idx = null;
	$found_idx = array('to' => null, 'from' => null);
	$check_from = in_array($mode, array(self::MODE_DRAFT, self::MODE_EDIT, self::MODE_REPLY));

	// Select identity
	foreach ($identities as $idx => $ident) {
	// use From: header when in edit/draft or reply-to-self
	if ($check_from && $from['mailto'] == strtolower($ident['email_ascii'])) {
	// remember first matching identity address
	if ($found_idx['from'] === null) {
	$found_idx['from'] = $idx;
	}
	// match identity name
	if ($from['name'] && $ident['name'] && $from['name'] == $ident['name']) {
	$from_idx = $idx;
	break;
	}
	}
	// use replied/forwarded message recipients
	else if (($found = array_search(strtolower($ident['email_ascii']), $a_recipients)) !== false) {
	// remember first matching identity address
	if ($found_idx['to'] === null) {
	$found_idx['to'] = $idx;
	}
	// match identity name
	if ($a_names[$found] && $ident['name'] && $a_names[$found] == $ident['name']) {
	$from_idx = $idx;
	break;
	}
	}
	}

	// If matching by name+address didn't find any matches,
	// get first found identity (address) if any
	if ($from_idx === null) {
	$from_idx = $found_idx['from'] !== null ? $found_idx['from'] : $found_idx['to'];
	}

	// Try Return-Path
	if ($from_idx === null && ($return_path = $message->headers->others['return-path'])) {
	$return_path = array_map('strtolower', (array) $return_path);

	foreach ($identities as $idx => $ident) {
	// Return-Path header contains an email address, but on some mailing list
	// it can be e.g. <pear-dev-return-55250-local=domain.tld@lists.php.net>
	// where local@domain.tld is the address we're looking for (#1489241)
	$ident1 = strtolower($ident['email_ascii']);
	$ident2 = str_replace('@', '=', $ident1);
	$ident1 = '<' . $ident1 . '>';
	$ident2 = '-' . $ident2 . '@';

	foreach ($return_path as $path) {
	if ($path == $ident1 \|\| stripos($path, $ident2)) {
	$from_idx = $idx;
	break 2;
	}
	}
	}
	}

	// See identity_select plugin for example usage of this hook
	$plugin = rcmail::get_instance()->plugins->exec_hook('identity_select', array(
	'message' => $message,
	'identities' => $identities,
	'selected' => $from_idx
	));

	$selected = $plugin['selected'];

	// default identity is always first on the list
	return $identities[$selected !== null ? $selected : 0];
	}
	}

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