rcmail_output_html.php
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rcmail_output_html.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: \|
	\| Class to handle HTML page output using a skin template. \|
	+-----------------------------------------------------------------------+
	\| Author: Thomas Bruederli <roundcube@gmail.com> \|
	+-----------------------------------------------------------------------+
	*/

	/**
	* Class to create HTML page output using a skin template
	*
	* @package Webmail
	* @subpackage View
	*/
	class rcmail_output_html extends rcmail_output
	{
	public $type = 'html';

	protected $message;
	protected $template_name;
	protected $objects = array();
	protected $js_env = array();
	protected $js_labels = array();
	protected $js_commands = array();
	protected $skin_paths = array();
	protected $skin_name = '';
	protected $scripts_path = '';
	protected $script_files = array();
	protected $css_files = array();
	protected $scripts = array();
	protected $meta_tags = array();
	protected $link_tags = array('shortcut icon' => '');
	protected $header = '';
	protected $footer = '';
	protected $body = '';
	protected $base_path = '';
	protected $assets_path;
	protected $assets_dir = RCUBE_INSTALL_PATH;
	protected $devel_mode = false;
	protected $default_template = "<html>\n<head><title></title></head>\n<body></body>\n</html>";

	// deprecated names of templates used before 0.5
	protected $deprecated_templates = array(
	'contact' => 'showcontact',
	'contactadd' => 'addcontact',
	'contactedit' => 'editcontact',
	'identityedit' => 'editidentity',
	'messageprint' => 'printmessage',
	);

	// deprecated names of template objects used before 1.4
	protected $deprecated_template_objects = array(
	'addressframe' => 'contentframe',
	'messagecontentframe' => 'contentframe',
	'prefsframe' => 'contentframe',
	'folderframe' => 'contentframe',
	'identityframe' => 'contentframe',
	'responseframe' => 'contentframe',
	'keyframe' => 'contentframe',
	'filterframe' => 'contentframe',
	);

	/**
	* Constructor
	*/
	public function __construct($task = null, $framed = false)
	{
	parent::__construct();

	$this->devel_mode = $this->config->get('devel_mode');

	$this->set_env('task', $task);
	$this->set_env('standard_windows', (bool) $this->config->get('standard_windows'));
	$this->set_env('locale', $_SESSION['language']);
	$this->set_env('devel_mode', $this->devel_mode);

	// Version number e.g. 1.4.2 will be 10402
	$version = explode('.', preg_replace('/[^0-9.].*/', '', RCMAIL_VERSION));
	$this->set_env('rcversion', $version[0] * 10000 + $version[1] * 100 + $version[2]);

	// add cookie info
	$this->set_env('cookie_domain', ini_get('session.cookie_domain'));
	$this->set_env('cookie_path', ini_get('session.cookie_path'));
	$this->set_env('cookie_secure', filter_var(ini_get('session.cookie_secure'), FILTER_VALIDATE_BOOLEAN));

	// Easy way to change skin via GET argument, for developers
	if ($this->devel_mode && !empty($_GET['skin']) && preg_match('/^[a-z0-9-_]+$/i', $_GET['skin'])) {
	if ($this->check_skin($_GET['skin'])) {
	$this->set_skin($_GET['skin']);
	$this->app->user->save_prefs(array('skin' => $_GET['skin']));
	}
	}

	// load and setup the skin
	$this->set_skin($this->config->get('skin'));
	$this->set_assets_path($this->config->get('assets_path'), $this->config->get('assets_dir'));

	if (!empty($_REQUEST['_extwin']))
	$this->set_env('extwin', 1);
	if ($this->framed \|\| $framed)
	$this->set_env('framed', 1);

	$lic = <<<EOF
	/*
	@licstart The following is the entire license notice for the
	JavaScript code in this page.

	Copyright (C) The Roundcube Dev Team

	The JavaScript code in this page is free software: you can redistribute
	it and/or modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation, either version 3 of
	the License, or (at your option) any later version.

	The code is distributed WITHOUT ANY WARRANTY; without even the implied
	warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
	See the GNU GPL for more details.

	@licend The above is the entire license notice
	for the JavaScript code in this page.
	*/
	EOF;
	// add common javascripts
	$this->add_script($lic, 'head_top');
	$this->add_script('var '.self::JS_OBJECT_NAME.' = new rcube_webmail();', 'head_top');

	// don't wait for page onload. Call init at the bottom of the page (delayed)
	$this->add_script(self::JS_OBJECT_NAME.'.init();', 'docready');

	$this->scripts_path = 'program/js/';
	$this->include_script('jquery.min.js');
	$this->include_script('common.js');
	$this->include_script('app.js');

	// register common UI objects
	$this->add_handlers(array(
	'loginform' => array($this, 'login_form'),
	'preloader' => array($this, 'preloader'),
	'username' => array($this, 'current_username'),
	'message' => array($this, 'message_container'),
	'charsetselector' => array($this, 'charset_selector'),
	'aboutcontent' => array($this, 'about_content'),
	));

	// set blankpage (watermark) url
	$blankpage = $this->config->get('blankpage_url', '/watermark.html');
	$this->set_env('blankpage', $blankpage);
	}

	/**
	* Set environment variable
	*
	* @param string $name Property name
	* @param mixed $value Property value
	* @param boolean $addtojs True if this property should be added
	* to client environment
	*/
	public function set_env($name, $value, $addtojs = true)
	{
	$this->env[$name] = $value;

	if ($addtojs \|\| isset($this->js_env[$name])) {
	$this->js_env[$name] = $value;
	}
	}

	/**
	* Parse and set assets path
	*
	* @param string $path Assets path URL (relative or absolute)
	* @param string $fs_dif Assets path in filesystem
	*/
	public function set_assets_path($path, $fs_dir = null)
	{
	if (empty($path)) {
	return;
	}

	$path = rtrim($path, '/') . '/';

	// handle relative assets path
	if (!preg_match('\|^https?://\|', $path) && $path[0] != '/') {
	// save the path to search for asset files later
	$this->assets_dir = $path;

	$base = preg_replace('/[?#&].*$/', '', $_SERVER['REQUEST_URI']);
	$base = rtrim($base, '/');

	// remove url token if exists
	if ($len = intval($this->config->get('use_secure_urls'))) {
	$_base = explode('/', $base);
	$last = count($_base) - 1;
	$length = $len > 1 ? $len : 16; // as in rcube::get_secure_url_token()

	// we can't use real token here because it
	// does not exists in unauthenticated state,
	// hope this will not produce false-positive matches
	if ($last > -1 && preg_match('/^[a-f0-9]{' . $length . '}$/', $_base[$last])) {
	$path = '../' . $path;
	}
	}
	}

	// set filesystem path for assets
	if ($fs_dir) {
	if ($fs_dir[0] != '/') {
	$fs_dir = realpath(RCUBE_INSTALL_PATH . $fs_dir);
	}
	// ensure the path ends with a slash
	$this->assets_dir = rtrim($fs_dir, '/') . '/';
	}

	$this->assets_path = $path;
	$this->set_env('assets_path', $path);
	}

	/**
	* Getter for the current page title
	*
	* @param bool $full Prepend title with product/user name
	*
	* @return string The page title
	*/
	protected function get_pagetitle($full = true)
	{
	if (!empty($this->pagetitle)) {
	$title = $this->pagetitle;
	}
	else if ($this->env['task'] == 'login') {
	$title = $this->app->gettext(array(
	'name' => 'welcome',
	'vars' => array('product' => $this->config->get('product_name')
	)));
	}
	else {
	$title = ucfirst($this->env['task']);
	}

	if ($full) {
	if ($this->devel_mode && !empty($_SESSION['username'])) {
	$title = $_SESSION['username'] . ' :: ' . $title;
	}
	else if ($prod_name = $this->config->get('product_name')) {
	$title = $prod_name . ' :: ' . $title;
	}
	}

	return $title;
	}

	/**
	* Getter for the current skin path property
	*/
	public function get_skin_path()
	{
	return $this->skin_paths[0];
	}

	/**
	* Set skin
	*
	* @param string $skin Skin name
	*/
	public function set_skin($skin)
	{
	if (!$this->check_skin($skin)) {
	$skin = rcube_config::DEFAULT_SKIN;
	}

	$skin_path = 'skins/' . $skin;

	$this->config->set('skin_path', $skin_path);
	$this->base_path = $skin_path;

	// register skin path(s)
	$this->skin_paths = array();
	$this->load_skin($skin_path);

	$this->skin_name = $skin;
	$this->set_env('skin', $skin);
	}

	/**
	* Check skin validity/existence
	*
	* @param string $skin Skin name
	*
	* @return bool True if the skin exist and is readable, False otherwise
	*/
	public function check_skin($skin)
	{
	// Sanity check to prevent from path traversal vulnerability (#1490620)
	if (strpos($skin, '/') !== false \|\| strpos($skin, "\\") !== false) {
	rcube::raise_error(array(
	'file' => __FILE__,
	'line' => __LINE__,
	'message' => 'Invalid skin name'
	), true, false);

	return false;
	}

	$path = RCUBE_INSTALL_PATH . 'skins/';

	return !empty($skin) && is_dir($path . $skin) && is_readable($path . $skin);
	}

	/**
	* Helper method to recursively read skin meta files and register search paths
	*/
	private function load_skin($skin_path)
	{
	$this->skin_paths[] = $skin_path;

	// read meta file and check for dependencies
	$meta = @file_get_contents(RCUBE_INSTALL_PATH . $skin_path . '/meta.json');
	$meta = @json_decode($meta, true);

	$meta['path'] = $skin_path;
	$path_elements = explode('/', $skin_path);
	$skin_id = end($path_elements);

	if (!$meta['name']) {
	$meta['name'] = $skin_id;
	}

	$this->skins[$skin_id] = $meta;

	// Keep skin config for ajax requests (#6613)
	$_SESSION['skin_config'] = array();

	if ($meta['extends']) {
	$path = RCUBE_INSTALL_PATH . 'skins/';
	if (is_dir($path . $meta['extends']) && is_readable($path . $meta['extends'])) {
	$_SESSION['skin_config'] = $this->load_skin('skins/' . $meta['extends']);
	}
	}

	if (!empty($meta['config'])) {
	foreach ($meta['config'] as $key => $value) {
	$this->config->set($key, $value, true);
	$_SESSION['skin_config'][$key] = $value;
	}

	$value = array_merge((array) $this->config->get('dont_override'), array_keys($meta['config']));
	$this->config->set('dont_override', $value, true);
	}

	if (!empty($meta['localization'])) {
	$locdir = $meta['localization'] === true ? 'localization' : $meta['localization'];
	if ($texts = $this->app->read_localization(RCUBE_INSTALL_PATH . $skin_path . '/' . $locdir)) {
	$this->app->load_language($_SESSION['language'], $texts);
	}
	}

	// Use array_merge() here to allow for global default and extended skins
	$this->meta_tags = array_merge($this->meta_tags, (array) $meta['meta']);
	$this->link_tags = array_merge($this->link_tags, (array) $meta['links']);

	return $_SESSION['skin_config'];
	}

	/**
	* Check if a specific template exists
	*
	* @param string $name Template name
	*
	* @return boolean True if template exists
	*/
	public function template_exists($name)
	{
	foreach ($this->skin_paths as $skin_path) {
	$filename = RCUBE_INSTALL_PATH . $skin_path . '/templates/' . $name . '.html';
	if ((is_file($filename) && is_readable($filename))
	\|\| ($this->deprecated_templates[$name] && $this->template_exists($this->deprecated_templates[$name]))
	) {
	return true;
	}
	}

	return false;
	}

	/**
	* Find the given file in the current skin path stack
	*
	* @param string $file File name/path to resolve (starting with /)
	* @param string &$skin_path Reference to the base path of the matching skin
	* @param string $add_path Additional path to search in
	*
	* @return mixed Relative path to the requested file or False if not found
	*/
	public function get_skin_file($file, &$skin_path = null, $add_path = null)
	{
	$skin_paths = $this->skin_paths;

	if ($add_path) {
	array_unshift($skin_paths, $add_path);
	$skin_paths = array_unique($skin_paths);
	}

	if ($skin_path = $this->find_file_path($file, $skin_paths)) {
	return $skin_path . $file;
	}

	return false;
	}

	/**
	* Find path of the asset file
	*/
	protected function find_file_path($file, $skin_paths)
	{
	foreach ($skin_paths as $skin_path) {
	if ($this->assets_dir != RCUBE_INSTALL_PATH) {
	if (realpath($this->assets_dir . $skin_path . $file)) {
	return $skin_path;
	}
	}

	if (realpath(RCUBE_INSTALL_PATH . $skin_path . $file)) {
	return $skin_path;
	}
	}
	}

	/**
	* Register a GUI object to the client script
	*
	* @param string $obj Object name
	* @param string $id Object ID
	*/
	public function add_gui_object($obj, $id)
	{
	$this->add_script(self::JS_OBJECT_NAME.".gui_object('$obj', '$id');");
	}

	/**
	* Call a client method
	*
	* @param string Method to call
	* @param ... Additional arguments
	*/
	public function command()
	{
	$cmd = func_get_args();
	if (strpos($cmd[0], 'plugin.') !== false)
	$this->js_commands[] = array('triggerEvent', $cmd[0], $cmd[1]);
	else
	$this->js_commands[] = $cmd;
	}

	/**
	* Add a localized label to the client environment
	*/
	public function add_label()
	{
	$args = func_get_args();

	if (count($args) == 1 && is_array($args[0])) {
	$args = $args[0];
	}

	foreach ($args as $name) {
	$this->js_labels[$name] = $this->app->gettext($name);
	}
	}

	/**
	* Invoke display_message command
	*
	* @param string $message Message to display
	* @param string $type Message type [notice\|confirm\|error]
	* @param array $vars Key-value pairs to be replaced in localized text
	* @param boolean $override Override last set message
	* @param int $timeout Message display time in seconds
	*
	* @uses self::command()
	*/
	public function show_message($message, $type='notice', $vars=null, $override=true, $timeout=0)
	{
	if ($override \|\| !$this->message) {
	if ($this->app->text_exists($message)) {
	if (!empty($vars))
	$vars = array_map(array('rcube','Q'), $vars);
	$msgtext = $this->app->gettext(array('name' => $message, 'vars' => $vars));
	}
	else
	$msgtext = $message;

	$this->message = $message;
	$this->command('display_message', $msgtext, $type, $timeout * 1000);
	}
	}

	/**
	* Delete all stored env variables and commands
	*
	* @param bool $all Reset all env variables (including internal)
	*/
	public function reset($all = false)
	{
	$framed = $this->framed;
	$task = $this->env['task'];
	$env = $all ? null : array_intersect_key($this->env, array('extwin'=>1, 'framed'=>1));

	// keep jQuery-UI files
	$css_files = $script_files = array();

	foreach ($this->css_files as $file) {
	if (strpos($file, 'plugins/jqueryui') === 0) {
	$css_files[] = $file;
	}
	}

	foreach ($this->script_files as $position => $files) {
	foreach ($files as $file) {
	if (strpos($file, 'plugins/jqueryui') === 0) {
	$script_files[$position][] = $file;
	}
	}
	}

	parent::reset();

	// let some env variables survive
	$this->env = $this->js_env = $env;
	$this->framed = $framed \|\| $this->env['framed'];
	$this->js_labels = array();
	$this->js_commands = array();
	$this->scripts = array();
	$this->header = '';
	$this->footer = '';
	$this->body = '';
	$this->css_files = array();
	$this->script_files = array();

	// load defaults
	if (!$all) {
	$this->__construct();
	}

	// Note: we merge jQuery-UI scripts after jQuery...
	$this->css_files = array_merge($this->css_files, $css_files);
	$this->script_files = array_merge_recursive($this->script_files, $script_files);

	$this->set_env('orig_task', $task);
	}

	/**
	* Redirect to a certain url
	*
	* @param mixed $p Either a string with the action or url parameters as key-value pairs
	* @param int $delay Delay in seconds
	* @param bool $secure Redirect to secure location (see rcmail::url())
	*/
	public function redirect($p = array(), $delay = 1, $secure = false)
	{
	if ($this->env['extwin'])
	$p['extwin'] = 1;
	$location = $this->app->url($p, false, false, $secure);
	header('Location: ' . $location);
	exit;
	}

	/**
	* Send the request output to the client.
	* This will either parse a skin template.
	*
	* @param string $templ Template name
	* @param boolean $exit True if script should terminate (default)
	*/
	public function send($templ = null, $exit = true)
	{
	if ($templ != 'iframe') {
	// prevent from endless loops
	if ($exit != 'recur' && $this->app->plugins->is_processing('render_page')) {
	rcube::raise_error(array('code' => 505, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => 'Recursion alert: ignoring output->send()'), true, false);
	return;
	}
	$this->parse($templ, false);
	}
	else {
	$this->framed = true;
	$this->write();
	}

	// set output asap
	ob_flush();
	flush();

	if ($exit) {
	exit;
	}
	}

	/**
	* Process template and write to stdOut
	*
	* @param string $template HTML template content
	*/
	public function write($template = '')
	{
	if (!empty($this->script_files)) {
	$this->set_env('request_token', $this->app->get_request_token());
	}

	// Fix assets path on blankpage
	if ($this->js_env['blankpage']) {
	$this->js_env['blankpage'] = $this->asset_url($this->abs_url($this->js_env['blankpage'], true));
	}

	$commands = $this->get_js_commands($framed);

	// if all js commands go to parent window we can ignore all
	// script files and skip rcube_webmail initialization (#1489792)
	// but not on error pages where skins may need jQuery, etc.
	if ($framed && empty($this->js_env['server_error'])) {
	$this->scripts = array();
	$this->script_files = array();
	$this->header = '';
	$this->footer = '';
	}

	// write all javascript commands
	if (!empty($commands)) {
	$this->add_script($commands, 'head_top');
	}

	$this->page_headers();

	// call super method
	$this->_write($template, $this->config->get('skin_path'));
	}

	/**
	* Send common page headers
	* For now it only (re)sets X-Frame-Options when needed
	*/
	public function page_headers()
	{
	if (headers_sent()) {
	return;
	}

	// allow (legal) iframe content to be loaded
	$framed = $this->framed \|\| $this->env['framed'];
	if ($framed && ($xopt = $this->app->config->get('x_frame_options', 'sameorigin'))) {
	if (strtolower($xopt) === 'deny') {
	header('X-Frame-Options: sameorigin', true);
	}
	}
	}

	/**
	* Parse a specific skin template and deliver to stdout (or return)
	*
	* @param string $name Template name
	* @param boolean $exit Exit script
	* @param boolean $write Don't write to stdout, return parsed content instead
	*
	* @link http://php.net/manual/en/function.exit.php
	*/
	function parse($name = 'main', $exit = true, $write = true)
	{
	$plugin = false;
	$realname = $name;
	$plugin_skin_paths = array();

	$this->template_name = $realname;

	$temp = explode('.', $name, 2);
	if (count($temp) > 1) {
	$plugin = $temp[0];
	$name = $temp[1];
	$skin_dir = $plugin . '/skins/' . $this->config->get('skin');

	// apply skin search escalation list to plugin directory
	foreach ($this->skin_paths as $skin_path) {
	$plugin_skin_paths[] = $this->app->plugins->url . $plugin . '/' . $skin_path;
	}

	// prepend plugin skin paths to search list
	$this->skin_paths = array_merge($plugin_skin_paths, $this->skin_paths);
	}

	// find skin template
	$path = false;
	foreach ($this->skin_paths as $skin_path) {
	// when requesting a plugin template ignore global skin path(s)
	if ($plugin && strpos($skin_path, $this->app->plugins->url) !== 0) {
	continue;
	}

	$path = RCUBE_INSTALL_PATH . "$skin_path/templates/$name.html";

	// fallback to deprecated template names
	if (!is_readable($path) && ($dname = $this->deprecated_templates[$realname])) {
	$path = RCUBE_INSTALL_PATH . "$skin_path/templates/$dname.html";

	if (is_readable($path)) {
	rcube::raise_error(array(
	'code' => 502, 'file' => __FILE__, 'line' => __LINE__,
	'message' => "Using deprecated template '$dname' in $skin_path/templates. Please rename to '$realname'"
	), true, false);
	}
	}

	if (is_readable($path)) {
	$this->config->set('skin_path', $skin_path);
	// set base_path to core skin directory (not plugin's skin)
	$this->base_path = preg_replace('!plugins/\w+/!', '', $skin_path);
	$skin_dir = preg_replace('!^plugins/!', '', $skin_path);
	break;
	}
	else {
	$path = false;
	}
	}

	// read template file
	if (!$path \|\| ($templ = @file_get_contents($path)) === false) {
	rcube::raise_error(array(
	'code' => 404,
	'type' => 'php',
	'line' => __LINE__,
	'file' => __FILE__,
	'message' => 'Error loading template for '.$realname
	), true, $write);

	$this->skin_paths = array_slice($this->skin_paths, count($plugin_skin_paths));
	return false;
	}

	// replace all path references to plugins/... with the configured plugins dir
	// and /this/ to the current plugin skin directory
	if ($plugin) {
	$templ = preg_replace(
	array('/\bplugins\//', '/(["\']?)\/this\//'),
	array($this->app->plugins->url, '\\1'.$this->app->plugins->url.$skin_dir.'/'),
	$templ
	);
	}

	// parse for specialtags
	$output = $this->parse_conditions($templ);
	$output = $this->parse_xml($output);

	// trigger generic hook where plugins can put additional content to the page
	$hook = $this->app->plugins->exec_hook("render_page", array(
	'template' => $realname, 'content' => $output, 'write' => $write));

	// save some memory
	$output = $hook['content'];
	unset($hook['content']);

	// remove plugin skin paths from current context
	$this->skin_paths = array_slice($this->skin_paths, count($plugin_skin_paths));

	if (!$write) {
	return $this->postrender($output);
	}

	$this->write(trim($output));

	if ($exit) {
	exit;
	}
	}

	/**
	* Return executable javascript code for all registered commands
	*/
	protected function get_js_commands(&$framed = null)
	{
	$out = '';
	$parent_commands = 0;
	$top_commands = array();

	// these should be always on top,
	// e.g. hide_message() below depends on env.framed
	if (!$this->framed && !empty($this->js_env)) {
	$top_commands[] = array('set_env', $this->js_env);
	}
	if (!empty($this->js_labels)) {
	$top_commands[] = array('add_label', $this->js_labels);
	}

	// unlock interface after iframe load
	$unlock = preg_replace('/[^a-z0-9]/i', '', $_REQUEST['_unlock']);
	if ($this->framed) {
	$top_commands[] = array('iframe_loaded', $unlock);
	}
	else if ($unlock) {
	$top_commands[] = array('hide_message', $unlock);
	}

	$commands = array_merge($top_commands, $this->js_commands);

	foreach ($commands as $i => $args) {
	$method = array_shift($args);
	$parent = $this->framed \|\| preg_match('/^parent\./', $method);

	foreach ($args as $i => $arg) {
	$args[$i] = self::json_serialize($arg, $this->devel_mode);
	}

	if ($parent) {
	$parent_commands++;
	$method = preg_replace('/^parent\./', '', $method);
	$parent_prefix = 'if (window.parent && parent.' . self::JS_OBJECT_NAME . ') parent.';
	$method = $parent_prefix . self::JS_OBJECT_NAME . '.' . $method;
	}
	else {
	$method = self::JS_OBJECT_NAME . '.' . $method;
	}

	$out .= sprintf("%s(%s);\n", $method, implode(',', $args));
	}

	$framed = $parent_prefix && $parent_commands == count($commands);

	// make the output more compact if all commands go to parent window
	if ($framed) {
	$out = "if (window.parent && parent." . self::JS_OBJECT_NAME . ") {\n"
	. str_replace($parent_prefix, "\tparent.", $out)
	. "}\n";
	}

	return $out;
	}

	/**
	* Make URLs starting with a slash point to skin directory
	*
	* @param string $str Input string
	* @param bool $search_path True if URL should be resolved using the current skin path stack
	*
	* @return string URL
	*/
	public function abs_url($str, $search_path = false)
	{
	if ($str[0] == '/') {
	if ($search_path && ($file_url = $this->get_skin_file($str, $skin_path))) {
	return $file_url;
	}

	return $this->base_path . $str;
	}

	return $str;
	}

	/**
	* Show error page and terminate script execution
	*
	* @param int $code Error code
	* @param string $message Error message
	*/
	public function raise_error($code, $message)
	{
	global $__page_content, $ERROR_CODE, $ERROR_MESSAGE;

	$ERROR_CODE = $code;
	$ERROR_MESSAGE = $message;

	include RCUBE_INSTALL_PATH . 'program/steps/utils/error.inc';
	exit;
	}

	/**
	* Modify path by adding URL prefix if configured
	*
	* @param string $path Asset path
	* @param bool $abs_url Pass to self::abs_url() first
	*
	* @return string Asset path
	*/
	public function asset_url($path, $abs_url = false)
	{
	// iframe content can't be in a different domain
	// @TODO: check if assests are on a different domain

	if ($abs_url) {
	$path = $this->abs_url($path, true);
	}

	if (!$this->assets_path \|\| in_array($path[0], array('?', '/', '.')) \|\| strpos($path, '://')) {
	return $path;
	}

	return $this->assets_path . $path;
	}


	/*** Template parsing methods ***/

	/**
	* Replace all strings ($varname)
	* with the content of the according global variable.
	*/
	protected function parse_with_globals($input)
	{
	$GLOBALS['__version'] = html::quote(RCMAIL_VERSION);
	$GLOBALS['__comm_path'] = html::quote($this->app->comm_path);
	$GLOBALS['__skin_path'] = html::quote($this->base_path);

	return preg_replace_callback('/\$(__[a-z0-9_\-]+)/',
	array($this, 'globals_callback'), $input);
	}

	/**
	* Callback function for preg_replace_callback() in parse_with_globals()
	*/
	protected function globals_callback($matches)
	{
	return $GLOBALS[$matches[1]];
	}

	/**
	* Correct absolute paths in images and other tags (add cache busters)
	*/
	protected function fix_paths($output)
	{
	return preg_replace_callback(
	'!(src\|href\|background\|data-src-[a-z]+)=(["\']?)([a-z0-9/_.-]+)(["\'\s>])!i',
	array($this, 'file_callback'), $output);
	}

	/**
	* Callback function for preg_replace_callback in fix_paths()
	*
	* @return string Parsed string
	*/
	protected function file_callback($matches)
	{
	$file = $matches[3];
	$file = preg_replace('!^/this/!', '/', $file);

	// correct absolute paths
	if ($file[0] == '/') {
	$this->get_skin_file($file, $skin_path, $this->base_path);
	$file = ($skin_path ?: $this->base_path) . $file;
	}

	// add file modification timestamp
	if (preg_match('/\.(js\|css\|less\|ico\|png\|svg\|jpeg)$/', $file, $m)) {
	$file = $this->file_mod($file);
	}

	return $matches[1] . '=' . $matches[2] . $file . $matches[4];
	}

	/**
	* Correct paths of asset files according to assets_path
	*/
	protected function fix_assets_paths($output)
	{
	return preg_replace_callback(
	'!(src\|href\|background)=(["\']?)([a-z0-9/_.?=-]+)(["\'\s>])!i',
	array($this, 'assets_callback'), $output);
	}

	/**
	* Callback function for preg_replace_callback in fix_assets_paths()
	*
	* @return string Parsed string
	*/
	protected function assets_callback($matches)
	{
	$file = $this->asset_url($matches[3]);

	return $matches[1] . '=' . $matches[2] . $file . $matches[4];
	}

	/**
	* Modify file by adding mtime indicator
	*/
	protected function file_mod($file)
	{
	$fs = false;
	$ext = substr($file, strrpos($file, '.') + 1);

	// use minified file if exists (not in development mode)
	if (!$this->devel_mode && !preg_match('/\.min\.' . $ext . '$/', $file)) {
	$minified_file = substr($file, 0, strlen($ext) * -1) . 'min.' . $ext;
	if ($fs = @filemtime($this->assets_dir . $minified_file)) {
	return $minified_file . '?s=' . $fs;
	}
	}

	if ($fs = @filemtime($this->assets_dir . $file)) {
	$file .= '?s=' . $fs;
	}

	return $file;
	}

	/**
	* Public wrapper to dipp into template parsing.
	*
	* @param string $input Template content
	*
	* @return string
	* @uses rcmail_output_html::parse_xml()
	* @since 0.1-rc1
	*/
	public function just_parse($input)
	{
	$input = $this->parse_conditions($input);
	$input = $this->parse_xml($input);
	$input = $this->postrender($input);

	return $input;
	}

	/**
	* Parse for conditional tags
	*/
	protected function parse_conditions($input)
	{
	$matches = preg_split('/<roundcube:(if\|elseif\|else\|endif)\s+([^>]+)>\n?/is', $input, 2, PREG_SPLIT_DELIM_CAPTURE);
	if ($matches && count($matches) == 4) {
	if (preg_match('/^(else\|endif)$/i', $matches[1])) {
	return $matches[0] . $this->parse_conditions($matches[3]);
	}

	$attrib = html::parse_attrib_string($matches[2]);

	if (isset($attrib['condition'])) {
	$condmet = $this->check_condition($attrib['condition']);
	$submatches = preg_split('/<roundcube:(elseif\|else\|endif)\s+([^>]+)>\n?/is', $matches[3], 2, PREG_SPLIT_DELIM_CAPTURE);

	if ($condmet) {
	$result = $submatches[0];
	if ($submatches[1] != 'endif') {
	$result .= preg_replace('/.*<roundcube:endif\s+[^>]+>\n?/Uis', '', $submatches[3], 1);
	}
	else {
	$result .= $submatches[3];
	}
	}
	else {
	$result = "<roundcube:$submatches[1] $submatches[2]>" . $submatches[3];
	}

	return $matches[0] . $this->parse_conditions($result);
	}

	rcube::raise_error(array(
	'code' => 500, 'line' => __LINE__, 'file' => __FILE__,
	'message' => "Unable to parse conditional tag " . $matches[2]
	), true, false);
	}

	return $input;
	}

	/**
	* Determines if a given condition is met
	*
	* @param string $condition Condition statement
	*
	* @return boolean True if condition is met, False if not
	* @todo Extend this to allow real conditions, not just "set"
	*/
	protected function check_condition($condition)
	{
	return $this->eval_expression($condition);
	}

	/**
	* Inserts hidden field with CSRF-prevention-token into POST forms
	*/
	protected function alter_form_tag($matches)
	{
	$out = $matches[0];
	$attrib = html::parse_attrib_string($matches[1]);

	if (strtolower($attrib['method']) == 'post') {
	$hidden = new html_hiddenfield(array('name' => '_token', 'value' => $this->app->get_request_token()));
	$out .= "\n" . $hidden->show();
	}

	return $out;
	}

	/**
	* Parse & evaluate a given expression and return its result.
	*
	* @param string $expression Expression statement
	*
	* @return mixed Expression result
	*/
	protected function eval_expression($expression)
	{
	$expression = preg_replace(
	array(
	'/session:([a-z0-9_]+)/i',
	'/config:([a-z0-9_]+)(:([a-z0-9_]+))?/i',
	'/env:([a-z0-9_]+)/i',
	'/request:([a-z0-9_]+)/i',
	'/cookie:([a-z0-9_]+)/i',
	'/browser:([a-z0-9_]+)/i',
	'/template:name/i',
	),
	array(
	"\$_SESSION['\\1']",
	"\$this->app->config->get('\\1',rcube_utils::get_boolean('\\3'))",
	"\$this->env['\\1']",
	"rcube_utils::get_input_value('\\1', rcube_utils::INPUT_GPC)",
	"\$_COOKIE['\\1']",
	"\$this->browser->{'\\1'}",
	"'{$this->template_name}'",
	),
	$expression
	);

	// Note: We used create_function() before but it's deprecated in PHP 7.2
	// and really it was just a wrapper on eval().
	return eval("return ($expression);");
	}

	/**
	* Parse variable strings
	*
	* @param string $type Variable type (env, config etc)
	* @param string $name Variable name
	*
	* @return mixed Variable value
	*/
	protected function parse_variable($type, $name)
	{
	$value = '';

	switch ($type) {
	case 'env':
	$value = $this->env[$name];
	break;
	case 'config':
	$value = $this->config->get($name);
	if (is_array($value) && $value[$_SESSION['storage_host']]) {
	$value = $value[$_SESSION['storage_host']];
	}
	break;
	case 'request':
	$value = rcube_utils::get_input_value($name, rcube_utils::INPUT_GPC);
	break;
	case 'session':
	$value = $_SESSION[$name];
	break;
	case 'cookie':
	$value = htmlspecialchars($_COOKIE[$name], ENT_COMPAT \| ENT_HTML401, RCUBE_CHARSET);
	break;
	case 'browser':
	$value = $this->browser->{$name};
	break;
	}

	return $value;
	}

	/**
	* Search for special tags in input and replace them
	* with the appropriate content
	*
	* @param string $input Input string to parse
	*
	* @return string Altered input string
	* @todo Use DOM-parser to traverse template HTML
	* @todo Maybe a cache.
	*/
	protected function parse_xml($input)
	{
	return preg_replace_callback('/<roundcube:([-_a-z]+)\s+((?:[^>]\|\\\\>)+)(?<!\\\\)>/Ui', array($this, 'xml_command'), $input);
	}

	/**
	* Callback function for parsing an xml command tag
	* and turn it into real html content
	*
	* @param array $matches Matches array of preg_replace_callback
	*
	* @return string Tag/Object content
	*/
	protected function xml_command($matches)
	{
	$command = strtolower($matches[1]);
	$attrib = html::parse_attrib_string($matches[2]);

	// empty output if required condition is not met
	if (!empty($attrib['condition']) && !$this->check_condition($attrib['condition'])) {
	return '';
	}

	// localize title and summary attributes
	if ($command != 'button' && !empty($attrib['title']) && $this->app->text_exists($attrib['title'])) {
	$attrib['title'] = $this->app->gettext($attrib['title']);
	}
	if ($command != 'button' && !empty($attrib['summary']) && $this->app->text_exists($attrib['summary'])) {
	$attrib['summary'] = $this->app->gettext($attrib['summary']);
	}

	// execute command
	switch ($command) {
	// return a button
	case 'button':
	if ($attrib['name'] \|\| $attrib['command']) {
	return $this->button($attrib);
	}
	break;

	// frame
	case 'frame':
	return $this->frame($attrib);
	break;

	// show a label
	case 'label':
	if ($attrib['expression'])
	$attrib['name'] = $this->eval_expression($attrib['expression']);

	if ($attrib['name'] \|\| $attrib['command']) {
	$vars = $attrib + array('product' => $this->config->get('product_name'));
	unset($vars['name'], $vars['command']);

	$label = $this->app->gettext($attrib + array('vars' => $vars));
	$quoting = !empty($attrib['quoting']) ? strtolower($attrib['quoting']) : (rcube_utils::get_boolean((string)$attrib['html']) ? 'no' : '');

	// 'noshow' can be used in skins to define new labels
	if ($attrib['noshow']) {
	return '';
	}

	switch ($quoting) {
	case 'no':
	case 'raw':
	break;
	case 'javascript':
	case 'js':
	$label = rcube::JQ($label);
	break;
	default:
	$label = html::quote($label);
	break;
	}

	return $label;
	}
	break;

	case 'add_label':
	$this->add_label($attrib['name']);
	break;

	// include a file
	case 'include':
	if ($attrib['condition'] && !$this->check_condition($attrib['condition'])) {
	break;
	}

	if ($attrib['file'][0] != '/') {
	$attrib['file'] = '/templates/' . $attrib['file'];
	}

	$old_base_path = $this->base_path;
	$include = '';

	if (!empty($attrib['skin_path'])) {
	$attrib['skinpath'] = $attrib['skin_path'];
	}

	if ($path = $this->get_skin_file($attrib['file'], $skin_path, $attrib['skinpath'])) {
	// set base_path to core skin directory (not plugin's skin)
	$this->base_path = preg_replace('!plugins/\w+/!', '', $skin_path);
	$path = realpath(RCUBE_INSTALL_PATH . $path);
	}

	if (is_readable($path)) {
	$allow_php = $this->config->get('skin_include_php');
	$include = $allow_php ? $this->include_php($path) : file_get_contents($path);
	$include = $this->parse_conditions($include);
	$include = $this->parse_xml($include);
	$include = $this->fix_paths($include);
	}

	$this->base_path = $old_base_path;

	return $include;

	case 'plugin.include':
	$hook = $this->app->plugins->exec_hook("template_plugin_include", $attrib);
	return $hook['content'];

	// define a container block
	case 'container':
	if ($attrib['name'] && $attrib['id']) {
	$this->command('gui_container', $attrib['name'], $attrib['id']);
	// let plugins insert some content here
	$hook = $this->app->plugins->exec_hook("template_container", $attrib);
	return $hook['content'];
	}
	break;

	// return code for a specific application object
	case 'object':
	$object = strtolower($attrib['name']);
	$content = '';

	// correct deprecated object names
	if ($this->deprecated_template_objects[$object]) {
	$object = $this->deprecated_template_objects[$object];
	}

	$handler = $this->object_handlers[$object];

	// execute object handler function
	if (is_callable($handler)) {
	$this->prepare_object_attribs($attrib);

	// We assume that objects with src attribute are internal (in most
	// cases this is a watermark frame). We need this to make sure assets_path
	// is added to the internal assets paths
	$external = empty($attrib['src']);
	$content = call_user_func($handler, $attrib);
	}
	else if ($object == 'doctype') {
	$content = html::doctype($attrib['value']);
	}
	else if ($object == 'logo') {
	$attrib += array('alt' => $this->xml_command(array('', 'object', 'name="productname"')));

	if (!empty($attrib['type']) && ($template_logo = $this->get_template_logo(':' . $attrib['type'], true)) !== null) {
	$attrib['src'] = $template_logo;
	}
	else if (($template_logo = $this->get_template_logo()) !== null) {
	$attrib['src'] = $template_logo;
	}

	// process alternative logos (eg for Elastic small screen)
	foreach ($attrib as $key => $value) {
	if (preg_match('/data-src-(.*)/', $key, $matches)) {
	if (($template_logo = $this->get_template_logo(':' . $matches[1], true)) !== null) {
	$attrib[$key] = $template_logo;
	}

	$attrib[$key] = !empty($attrib[$key]) ? $this->abs_url($attrib[$key]) : null;
	}
	}

	if ($attrib['src']) {
	$content = html::img($attrib);
	}
	}
	else if ($object == 'productname') {
	$name = $this->config->get('product_name', 'Roundcube Webmail');
	$content = html::quote($name);
	}
	else if ($object == 'version') {
	$ver = (string)RCMAIL_VERSION;
	if (is_file(RCUBE_INSTALL_PATH . '.svn/entries')) {
	if (preg_match('/Revision:\s(\d+)/', @shell_exec('svn info'), $regs))
	$ver .= ' [SVN r'.$regs[1].']';
	}
	else if (is_file(RCUBE_INSTALL_PATH . '.git/index')) {
	if (preg_match('/Date:\s+([^\n]+)/', @shell_exec('git log -1'), $regs)) {
	if ($date = date('Ymd.Hi', strtotime($regs[1]))) {
	$ver .= ' [GIT '.$date.']';
	}
	}
	}
	$content = html::quote($ver);
	}
	else if ($object == 'steptitle') {
	$content = html::quote($this->get_pagetitle(false));
	}
	else if ($object == 'pagetitle') {
	// Deprecated, <title> will be added automatically
	$content = html::quote($this->get_pagetitle());
	}
	else if ($object == 'contentframe') {
	if (empty($attrib['id'])) {
	$attrib['id'] = 'rcm' . $this->env['task'] . 'frame';
	}

	// parse variables
	if (preg_match('/^(config\|env):([a-z0-9_]+)$/i', $attrib['src'], $matches)) {
	$attrib['src'] = $this->parse_variable($matches[1], $matches[2]);
	}

	$content = $this->frame($attrib, true);
	}
	else if ($object == 'meta' \|\| $object == 'links') {
	if ($object == 'meta') {
	$source = 'meta_tags';
	$tag = 'meta';
	$key = 'name';
	$param = 'content';
	}
	else if ($object == 'links') {
	$source = 'link_tags';
	$tag = 'link';
	$key = 'rel';
	$param = 'href';
	}

	foreach ($this->$source as $name => $vars) {
	// $vars can be in many forms:
	// - string
	// - array('key' => 'val')
	// - array(string, string)
	// - array(array(), string)
	// - array(array('key' => 'val'), array('key' => 'val'))
	// normalise this for processing by checking for string array keys
	$vars = is_array($vars) ? (count(array_filter(array_keys($vars), 'is_string')) > 0 ? array($vars) : $vars) : array($vars);

	foreach ($vars as $args) {
	// skip unset headers e.g. when extending a skin and removing a header defined in the parent
	if ($args === false) {
	continue;
	}

	$args = is_array($args) ? $args : array($param => $args);

	// special handling for favicon
	if ($object == 'links' && $name == 'shortcut icon' && empty($args[$param])) {
	if ($href = $this->get_template_logo(':favicon', true)) {
	$args[$param] = $href;
	}
	else if ($href = $this->config->get('favicon', '/images/favicon.ico')) {
	$args[$param] = $href;
	}
	}

	$content .= html::tag($tag, array($key => $name, 'nl' => true) + $args);
	}
	}
	}

	// exec plugin hooks for this template object
	$hook = $this->app->plugins->exec_hook("template_object_$object", $attrib + array('content' => $content));

	if (strlen($hook['content']) && !empty($external)) {
	$object_id = uniqid('TEMPLOBJECT:', true);
	$this->objects[$object_id] = $hook['content'];
	$hook['content'] = $object_id;
	}

	return $hook['content'];

	// return <link> element
	case 'link':
	if ($attrib['condition'] && !$this->check_condition($attrib['condition'])) {
	break;
	}

	unset($attrib['condition']);

	return html::tag('link', $attrib);


	// return code for a specified eval expression
	case 'exp':
	return html::quote($this->eval_expression($attrib['expression']));

	// return variable
	case 'var':
	$var = explode(':', $attrib['name']);
	$value = $this->parse_variable($var[0], $var[1]);

	if (is_array($value)) {
	$value = implode(', ', $value);
	}

	return html::quote($value);

	case 'form':
	return $this->form_tag($attrib);
	}
	return '';
	}

	/**
	* Prepares template object attributes
	*
	* @param array &$attribs Attributes
	*/
	protected function prepare_object_attribs(&$attribs)
	{
	// Localize data-label-* attributes
	array_walk($attribs, function(&$value, $key, $rcube) {
	if (strpos($key, 'data-label-') === 0) {
	$value = $rcube->gettext($value);
	}
	}, $this->app);
	}

	/**
	* Include a specific file and return it's contents
	*
	* @param string $file File path
	*
	* @return string Contents of the processed file
	*/
	protected function include_php($file)
	{
	ob_start();
	include $file;
	$out = ob_get_contents();
	ob_end_clean();

	return $out;
	}

	/**
	* Put objects' content back into template output
	*/
	protected function postrender($output)
	{
	// insert objects' contents
	foreach ($this->objects as $key => $val) {
	$output = str_replace($key, $val, $output, $count);
	if ($count) {
	$this->objects[$key] = null;
	}
	}

	// make sure all <form> tags have a valid request token
	$output = preg_replace_callback('/<form\s+([^>]+)>/Ui', array($this, 'alter_form_tag'), $output);

	return $output;
	}

	/**
	* Create and register a button
	*
	* @param array $attrib Named button attributes
	*
	* @return string HTML button
	* @todo Remove all inline JS calls and use jQuery instead.
	* @todo Remove all sprintf()'s - they are pretty, but also slow.
	*/
	public function button($attrib)
	{
	static $s_button_count = 100;
	static $disabled_actions = null;

	// these commands can be called directly via url
	$a_static_commands = array('compose', 'list', 'preferences', 'folders', 'identities');

	if (!($attrib['command'] \|\| $attrib['name'] \|\| $attrib['href'])) {
	return '';
	}

	// try to find out the button type
	if ($attrib['type']) {
	$attrib['type'] = strtolower($attrib['type']);
	if ($pos = strpos($attrib['type'], '-menuitem')) {
	$attrib['type'] = substr($attrib['type'], 0, -9);
	$menuitem = true;
	}
	}
	else {
	$attrib['type'] = ($attrib['image'] \|\| $attrib['imagepas'] \|\| $attrib['imageact']) ? 'image' : 'button';
	}

	$command = $attrib['command'];
	$action = $command ?: $attrib['name'];

	if ($attrib['task']) {
	$command = $attrib['task'] . '.' . $command;
	$element = $attrib['task'] . '.' . $action;
	}
	else {
	$element = ($this->env['task'] ? $this->env['task'] . '.' : '') . $action;
	}

	if ($disabled_actions === null) {
	$disabled_actions = (array) $this->config->get('disabled_actions');
	}

	// remove buttons for disabled actions
	if (in_array($element, $disabled_actions) \|\| in_array($action, $disabled_actions)) {
	return '';
	}

	if (!$attrib['image']) {
	$attrib['image'] = $attrib['imagepas'] ? $attrib['imagepas'] : $attrib['imageact'];
	}

	if (!$attrib['id']) {
	$attrib['id'] = sprintf('rcmbtn%d', $s_button_count++);
	}
	// get localized text for labels and titles
	if ($attrib['title']) {
	$attrib['title'] = html::quote($this->app->gettext($attrib['title'], $attrib['domain']));
	}
	if ($attrib['label']) {
	$attrib['label'] = html::quote($this->app->gettext($attrib['label'], $attrib['domain']));
	}
	if ($attrib['alt']) {
	$attrib['alt'] = html::quote($this->app->gettext($attrib['alt'], $attrib['domain']));
	}

	// set accessibility attributes
	if (!$attrib['role']) {
	$attrib['role'] = 'button';
	}
	if (!empty($attrib['class']) && !empty($attrib['classact']) \|\| !empty($attrib['imagepas']) && !empty($attrib['imageact'])) {
	if (array_key_exists('tabindex', $attrib))
	$attrib['data-tabindex'] = $attrib['tabindex'];
	$attrib['tabindex'] = '-1'; // disable button by default
	$attrib['aria-disabled'] = 'true';
	}

	// set title to alt attribute for IE browsers
	if ($this->browser->ie && !$attrib['title'] && $attrib['alt']) {
	$attrib['title'] = $attrib['alt'];
	}

	// add empty alt attribute for XHTML compatibility
	if (!isset($attrib['alt'])) {
	$attrib['alt'] = '';
	}

	// register button in the system
	if ($attrib['command']) {
	$this->add_script(sprintf(
	"%s.register_button('%s', '%s', '%s', '%s', '%s', '%s');",
	self::JS_OBJECT_NAME,
	$command,
	$attrib['id'],
	$attrib['type'],
	$attrib['imageact'] ? $this->abs_url($attrib['imageact']) : $attrib['classact'],
	$attrib['imagesel'] ? $this->abs_url($attrib['imagesel']) : $attrib['classsel'],
	$attrib['imageover'] ? $this->abs_url($attrib['imageover']) : ''
	));

	// make valid href to specific buttons
	if (in_array($attrib['command'], rcmail::$main_tasks)) {
	$attrib['href'] = $this->app->url(array('task' => $attrib['command']));
	$attrib['onclick'] = sprintf("return %s.command('switch-task','%s',this,event)", self::JS_OBJECT_NAME, $attrib['command']);
	}
	else if ($attrib['task'] && in_array($attrib['task'], rcmail::$main_tasks)) {
	$attrib['href'] = $this->app->url(array('action' => $attrib['command'], 'task' => $attrib['task']));
	}
	else if (in_array($attrib['command'], $a_static_commands)) {
	$attrib['href'] = $this->app->url(array('action' => $attrib['command']));
	}
	else if (($attrib['command'] == 'permaurl' \|\| $attrib['command'] == 'extwin') && !empty($this->env['permaurl'])) {
	$attrib['href'] = $this->env['permaurl'];
	}
	}

	// overwrite attributes
	if (!$attrib['href']) {
	$attrib['href'] = '#';
	}

	if ($attrib['task']) {
	if ($attrib['classact']) {
	$attrib['class'] = $attrib['classact'];
	}
	}
	else if ($command && !$attrib['onclick']) {
	$attrib['onclick'] = sprintf(
	"return %s.command('%s','%s',this,event)",
	self::JS_OBJECT_NAME,
	$command,
	$attrib['prop']
	);
	}

	$out = '';

	// generate image tag
	if ($attrib['type'] == 'image') {
	$attrib_str = html::attrib_string(
	$attrib,
	array(
	'style', 'class', 'id', 'width', 'height', 'border', 'hspace',
	'vspace', 'align', 'alt', 'tabindex', 'title'
	)
	);
	$btn_content = sprintf('<img src="%s"%s />', $this->abs_url($attrib['image']), $attrib_str);
	if ($attrib['label']) {
	$btn_content .= ' '.$attrib['label'];
	}
	$link_attrib = array('href', 'onclick', 'onmouseover', 'onmouseout', 'onmousedown', 'onmouseup', 'target');
	}
	else if ($attrib['type'] == 'link') {
	$btn_content = isset($attrib['content']) ? $attrib['content'] : ($attrib['label'] ? $attrib['label'] : $attrib['command']);
	$link_attrib = array_merge(html::$common_attrib, array('href', 'onclick', 'tabindex', 'target', 'rel'));
	if ($attrib['innerclass']) {
	$btn_content = html::span($attrib['innerclass'], $btn_content);
	}
	}
	else if ($attrib['type'] == 'input') {
	$attrib['type'] = 'button';

	if ($attrib['label']) {
	$attrib['value'] = $attrib['label'];
	}
	if ($attrib['command']) {
	$attrib['disabled'] = 'disabled';
	}

	$out = html::tag('input', $attrib, null, array('type', 'value', 'onclick', 'id', 'class', 'style', 'tabindex', 'disabled'));
	}
	else {
	if ($attrib['label']) {
	$attrib['value'] = $attrib['label'];
	}
	if ($attrib['command']) {
	$attrib['disabled'] = 'disabled';
	}

	$content = isset($attrib['content']) ? $attrib['content'] : $attrib['label'];
	$out = html::tag('button', $attrib, $content, array('type', 'value', 'onclick', 'id', 'class', 'style', 'tabindex', 'disabled'));
	}

	// generate html code for button
	if ($btn_content) {
	$attrib_str = html::attrib_string($attrib, $link_attrib);
	$out = sprintf('<a%s>%s</a>', $attrib_str, $btn_content);
	}

	if ($attrib['wrapper']) {
	$out = html::tag($attrib['wrapper'], null, $out);
	}

	if ($menuitem) {
	$class = $attrib['menuitem-class'] ? ' class="' . $attrib['menuitem-class'] . '"' : '';
	$out = '<li role="menuitem"' . $class . '>' . $out . '</li>';
	}

	return $out;
	}

	/**
	* Link an external script file
	*
	* @param string $file File URL
	* @param string $position Target position [head\|head_bottom\|foot]
	*/
	public function include_script($file, $position = 'head', $add_path = true)
	{
	if ($add_path && !preg_match('\|^https?://\|i', $file) && $file[0] != '/') {
	$file = $this->file_mod($this->scripts_path . $file);
	}

	if (!is_array($this->script_files[$position])) {
	$this->script_files[$position] = array();
	}

	if (!in_array($file, $this->script_files[$position])) {
	$this->script_files[$position][] = $file;
	}
	}

	/**
	* Add inline javascript code
	*
	* @param string $script JS code snippet
	* @param string $position Target position [head\|head_top\|foot\|docready]
	*/
	public function add_script($script, $position = 'head')
	{
	if (!isset($this->scripts[$position])) {
	$this->scripts[$position] = "\n" . rtrim($script);
	}
	else {
	$this->scripts[$position] .= "\n" . rtrim($script);
	}
	}

	/**
	* Link an external css file
	*
	* @param string $file File URL
	*/
	public function include_css($file)
	{
	$this->css_files[] = $file;
	}

	/**
	* Add HTML code to the page header
	*
	* @param string $str HTML code
	*/
	public function add_header($str)
	{
	$this->header .= "\n" . $str;
	}

	/**
	* Add HTML code to the page footer
	* To be added right befor </body>
	*
	* @param string $str HTML code
	*/
	public function add_footer($str)
	{
	$this->footer .= "\n" . $str;
	}

	/**
	* Process template and write to stdOut
	*
	* @param string $output HTML output
	* @param string $base_path Base for absolute paths
	*/
	protected function _write($output = '', $base_path = '')
	{
	$output = trim($output);

	if (empty($output)) {
	$output = html::doctype('html5') . "\n" . $this->default_template;
	$is_empty = true;
	}

	$merge_script_files = function($output, $script) {
	return $output . html::script($script);
	};

	$merge_scripts = function($output, $script) {
	return $output . html::script(array(), $script);
	};

	// put docready commands into page footer
	if (!empty($this->scripts['docready'])) {
	$this->add_script('$(function(){ ' . $this->scripts['docready'] . "\n});", 'foot');
	}

	$page_header = '';
	$page_footer = '';
	$meta = '';

	// declare page language
	if (!empty($_SESSION['language'])) {
	$lang = substr($_SESSION['language'], 0, 2);
	$output = preg_replace('/<html/', '<html lang="' . html::quote($lang) . '"', $output, 1);

	if (!headers_sent()) {
	header('Content-Language: ' . $lang);
	}
	}

	// include meta tag with charset
	if (!empty($this->charset)) {
	if (!headers_sent()) {
	header('Content-Type: text/html; charset=' . $this->charset);
	}

	$meta .= html::tag('meta', array(
	'http-equiv' => 'content-type',
	'content' => "text/html; charset={$this->charset}",
	'nl' => true
	));
	}

	// include page title (after charset specification)
	$meta .= '<title>' . html::quote($this->get_pagetitle()) . "</title>\n";

	$output = preg_replace('/(<head[^>]>)\n/i', "\\1\n{$meta}", $output, 1, $count);
	if (!$count) {
	$page_header .= $meta;
	}

	// include scripts into header/footer
	$page_header .= array_reduce((array) $this->script_files['head'], $merge_script_files);
	$page_header .= array_reduce(array($this->scripts['head_top'] . $this->scripts['head']), $merge_scripts);
	$page_header .= $this->header . "\n";
	$page_header .= array_reduce((array) $this->script_files['head_bottom'], $merge_script_files);

	$page_footer .= array_reduce((array) $this->script_files['foot'], $merge_script_files);
	$page_footer .= $this->footer . "\n";
	$page_footer .= array_reduce((array) $this->scripts['foot'], $merge_scripts);

	// find page header
	if ($hpos = stripos($output, '</head>')) {
	$page_header .= "\n";
	}
	else {
	if (!is_numeric($hpos)) {
	$hpos = stripos($output, '<body');
	}
	if (!is_numeric($hpos) && ($hpos = stripos($output, '<html'))) {
	while ($output[$hpos] != '>') {
	$hpos++;
	}
	$hpos++;
	}
	$page_header = "<head>\n$page_header\n</head>\n";
	}

	// add page hader
	if ($hpos) {
	$output = substr_replace($output, $page_header, $hpos, 0);
	}
	else {
	$output = $page_header . $output;
	}

	// add page footer
	if (($fpos = strripos($output, '</body>')) \|\| ($fpos = strripos($output, '</html>'))) {
	// for Elastic: put footer content before "footer scripts"
	while (($npos = strripos($output, "\n", -strlen($output) + $fpos - 1))
	&& $npos != $fpos
	&& ($chunk = substr($output, $npos, $fpos - $npos)) !== ''
	&& (trim($chunk) === '' \|\| preg_match('/\s<script[^>]+><\/script>\s/', $chunk))
	) {
	$fpos = $npos;
	}

	$output = substr_replace($output, $page_footer."\n", $fpos, 0);
	}
	else {
	$output .= "\n".$page_footer;
	}

	// add css files in head, before scripts, for speed up with parallel downloads
	if (!empty($this->css_files) && !$is_empty
	&& (($pos = stripos($output, '<script ')) \|\| ($pos = stripos($output, '</head>')))
	) {
	$css = '';
	foreach ($this->css_files as $file) {
	$is_less = substr_compare($file, '.less', -5, 5, true) === 0;
	$css .= html::tag('link', array(
	'rel' => $is_less ? 'stylesheet/less' : 'stylesheet',
	'type' => 'text/css',
	'href' => $file,
	'nl' => true,
	));
	}
	$output = substr_replace($output, $css, $pos, 0);
	}

	$output = $this->parse_with_globals($this->fix_paths($output));

	if ($this->assets_path) {
	$output = $this->fix_assets_paths($output);
	}

	$output = $this->postrender($output);

	// trigger hook with final HTML content to be sent
	$hook = $this->app->plugins->exec_hook("send_page", array('content' => $output));
	if (!$hook['abort']) {
	if ($this->charset != RCUBE_CHARSET) {
	echo rcube_charset::convert($hook['content'], RCUBE_CHARSET, $this->charset);
	}
	else {
	echo $hook['content'];
	}
	}
	}

	/**
	* Returns iframe object, registers some related env variables
	*
	* @param array $attrib HTML attributes
	* @param boolean $is_contentframe Register this iframe as the 'contentframe' gui object
	*
	* @return string IFRAME element
	*/
	public function frame($attrib, $is_contentframe = false)
	{
	static $idcount = 0;

	if (!$attrib['id']) {
	$attrib['id'] = 'rcmframe' . ++$idcount;
	}

	$attrib['name'] = $attrib['id'];
	$attrib['src'] = $attrib['src'] ? $this->abs_url($attrib['src'], true) : 'about:blank';

	// register as 'contentframe' object
	if ($is_contentframe \|\| $attrib['contentframe']) {
	$this->set_env('contentframe', $attrib['contentframe'] ? $attrib['contentframe'] : $attrib['name']);
	}

	return html::iframe($attrib);
	}


	/* *********** common functions delivering gui objects ************ */

	/**
	* Create a form tag with the necessary hidden fields
	*
	* @param array $attrib Named tag parameters
	* @param string $content HTML content of the form
	*
	* @return string HTML code for the form
	*/
	public function form_tag($attrib, $content = null)
	{
	if ($this->env['extwin']) {
	$hiddenfield = new html_hiddenfield(array('name' => '_extwin', 'value' => '1'));
	$hidden = $hiddenfield->show();
	}
	else if ($this->framed \|\| $this->env['framed']) {
	$hiddenfield = new html_hiddenfield(array('name' => '_framed', 'value' => '1'));
	$hidden = $hiddenfield->show();
	}

	if (!$content) {
	$attrib['noclose'] = true;
	}

	return html::tag('form',
	$attrib + array('action' => $this->app->comm_path, 'method' => "get"),
	$hidden . $content,
	array('id','class','style','name','method','action','enctype','onsubmit')
	);
	}

	/**
	* Build a form tag with a unique request token
	*
	* @param array $attrib Named tag parameters including 'action' and 'task' values
	* which will be put into hidden fields
	* @param string $content Form content
	*
	* @return string HTML code for the form
	*/
	public function request_form($attrib, $content = '')
	{
	$hidden = new html_hiddenfield();
	if ($attrib['task']) {
	$hidden->add(array('name' => '_task', 'value' => $attrib['task']));
	}
	if ($attrib['action']) {
	$hidden->add(array('name' => '_action', 'value' => $attrib['action']));
	}

	// we already have a <form> tag
	if ($attrib['form']) {
	if ($this->framed \|\| $this->env['framed']) {
	$hidden->add(array('name' => '_framed', 'value' => '1'));
	}

	return $hidden->show() . $content;
	}

	unset($attrib['task'], $attrib['request']);
	$attrib['action'] = './';

	return $this->form_tag($attrib, $hidden->show() . $content);
	}

	/**
	* GUI object 'username'
	* Showing IMAP username of the current session
	*
	* @param array $attrib Named tag parameters (currently not used)
	*
	* @return string HTML code for the gui object
	*/
	public function current_username($attrib)
	{
	static $username;

	// alread fetched
	if (!empty($username)) {
	return $username;
	}

	// Current username is an e-mail address
	if (strpos($_SESSION['username'], '@')) {
	$username = $_SESSION['username'];
	}
	// get e-mail address from default identity
	else if ($sql_arr = $this->app->user->get_identity()) {
	$username = $sql_arr['email'];
	}
	else {
	$username = $this->app->user->get_username();
	}

	return rcube_utils::idn_to_utf8($username);
	}

	/**
	* GUI object 'loginform'
	* Returns code for the webmail login form
	*
	* @param array $attrib Named parameters
	*
	* @return string HTML code for the gui object
	*/
	protected function login_form($attrib)
	{
	$default_host = $this->config->get('default_host');
	$autocomplete = (int) $this->config->get('login_autocomplete');

	$_SESSION['temp'] = true;

	// save original url
	$url = rcube_utils::get_input_value('_url', rcube_utils::INPUT_POST);
	if (empty($url) && !preg_match('/_(task\|action)=logout/', $_SERVER['QUERY_STRING']))
	$url = $_SERVER['QUERY_STRING'];

	// Disable autocapitalization on iPad/iPhone (#1488609)
	$attrib['autocapitalize'] = 'off';

	$form_name = !empty($attrib['form']) ? $attrib['form'] : 'form';

	// set atocomplete attribute
	$user_attrib = $autocomplete > 0 ? array() : array('autocomplete' => 'off');
	$host_attrib = $autocomplete > 0 ? array() : array('autocomplete' => 'off');
	$pass_attrib = $autocomplete > 1 ? array() : array('autocomplete' => 'off');

	$input_task = new html_hiddenfield(array('name' => '_task', 'value' => 'login'));
	$input_action = new html_hiddenfield(array('name' => '_action', 'value' => 'login'));
	$input_tzone = new html_hiddenfield(array('name' => '_timezone', 'id' => 'rcmlogintz', 'value' => '_default_'));
	$input_url = new html_hiddenfield(array('name' => '_url', 'id' => 'rcmloginurl', 'value' => $url));
	$input_user = new html_inputfield(array('name' => '_user', 'id' => 'rcmloginuser', 'required' => 'required')
	+ $attrib + $user_attrib);
	$input_pass = new html_passwordfield(array('name' => '_pass', 'id' => 'rcmloginpwd', 'required' => 'required')
	+ $attrib + $pass_attrib);
	$input_host = null;

	if (is_array($default_host) && count($default_host) > 1) {
	$input_host = new html_select(array('name' => '_host', 'id' => 'rcmloginhost'));

	foreach ($default_host as $key => $value) {
	if (!is_array($value)) {
	$input_host->add($value, (is_numeric($key) ? $value : $key));
	}
	else {
	$input_host = null;
	break;
	}
	}
	}
	else if (is_array($default_host) && ($host = key($default_host)) !== null) {
	$hide_host = true;
	$input_host = new html_hiddenfield(array(
	'name' => '_host', 'id' => 'rcmloginhost', 'value' => is_numeric($host) ? $default_host[$host] : $host) + $attrib);
	}
	else if (empty($default_host)) {
	$input_host = new html_inputfield(array('name' => '_host', 'id' => 'rcmloginhost')
	+ $attrib + $host_attrib);
	}

	$this->add_gui_object('loginform', $form_name);

	// create HTML table with two cols
	$table = new html_table(array('cols' => 2));

	$table->add('title', html::label('rcmloginuser', html::quote($this->app->gettext('username'))));
	$table->add('input', $input_user->show(rcube_utils::get_input_value('_user', rcube_utils::INPUT_GPC)));

	$table->add('title', html::label('rcmloginpwd', html::quote($this->app->gettext('password'))));
	$table->add('input', $input_pass->show());

	// add host selection row
	if (is_object($input_host) && !$hide_host) {
	$table->add('title', html::label('rcmloginhost', html::quote($this->app->gettext('server'))));
	$table->add('input', $input_host->show(rcube_utils::get_input_value('_host', rcube_utils::INPUT_GPC)));
	}

	$out = $input_task->show();
	$out .= $input_action->show();
	$out .= $input_tzone->show();
	$out .= $input_url->show();
	$out .= $table->show();

	if ($hide_host) {
	$out .= $input_host->show();
	}

	if (rcube_utils::get_boolean($attrib['submit'])) {
	$button_attr = array('type' => 'submit', 'id' => 'rcmloginsubmit', 'class' => 'button mainaction submit');
	$out .= html::p('formbuttons', html::tag('button', $button_attr, $this->app->gettext('login')));
	}

	// surround html output with a form tag
	if (empty($attrib['form'])) {
	$out = $this->form_tag(array('name' => $form_name, 'method' => 'post'), $out);
	}

	// include script for timezone detection
	$this->include_script('jstz.min.js');

	return $out;
	}

	/**
	* GUI object 'preloader'
	* Loads javascript code for images preloading
	*
	* @param array $attrib Named parameters
	* @return void
	*/
	protected function preloader($attrib)
	{
	$images = preg_split('/[\s\t\n,]+/', $attrib['images'], -1, PREG_SPLIT_NO_EMPTY);
	$images = array_map(array($this, 'abs_url'), $images);
	$images = array_map(array($this, 'asset_url'), $images);

	if (empty($images) \|\| $_REQUEST['_task'] == 'logout') {
	return;
	}

	$this->add_script('var images = ' . self::json_serialize($images, $this->devel_mode) .';
	for (var i=0; i<images.length; i++) {
	img = new Image();
	img.src = images[i];
	}', 'docready');
	}

	/**
	* GUI object 'searchform'
	* Returns code for search function
	*
	* @param array $attrib Named parameters
	*
	* @return string HTML code for the gui object
	*/
	public function search_form($attrib)
	{
	// add some labels to client
	$this->add_label('searching');

	$attrib['name'] = '_q';
	$attrib['class'] = trim($attrib['class'] . ' no-bs');

	if (empty($attrib['id'])) {
	$attrib['id'] = 'rcmqsearchbox';
	}
	if ($attrib['type'] == 'search' && !$this->browser->khtml) {
	unset($attrib['type'], $attrib['results']);
	}
	if (empty($attrib['placeholder'])) {
	$attrib['placeholder'] = $this->app->gettext('searchplaceholder');
	}

	$label = html::label(array('for' => $attrib['id'], 'class' => 'voice'), rcube::Q($this->app->gettext('arialabelsearchterms')));
	$input_q = new html_inputfield($attrib);
	$out = $label . $input_q->show();

	// Support for multiple searchforms on the same page
	if ($attrib['gui-object'] !== false && $attrib['gui-object'] !== 'false') {
	$this->add_gui_object($attrib['gui-object'] ?: 'qsearchbox', $attrib['id']);
	}

	// add form tag around text field
	if (empty($attrib['form']) && empty($attrib['no-form'])) {
	$out = $this->form_tag(array(
	'name' => $attrib['form-name'] ?: 'rcmqsearchform',
	'onsubmit' => sprintf("%s.command('%s'); return false", self::JS_OBJECT_NAME, $attrib['command'] ?: 'search'),
	// 'style' => "display:inline"
	), $out);
	}

	if (!empty($attrib['wrapper'])) {
	$header = html::tag($attrib['ariatag'] ?: 'h2', array(
	'id' => 'aria-label-' . $attrib['label'],
	'class' => 'voice'
	), rcube::Q($this->app->gettext('arialabel' . $attrib['label'], $attrib['label-domain'])));

	if ($attrib['options']) {
	$options_button = $this->button(array(
	'type' => 'link',
	'href' => '#search-filter',
	'class' => 'button options',
	'label' => 'options',
	'title' => 'options',
	'tabindex' => '0',
	'innerclass' => 'inner',
	'data-target' => $attrib['options']
	));
	}

	$search_button = $this->button(array(
	'type' => 'link',
	'href' => '#search',
	'class' => 'button search',
	'label' => $attrib['buttontitle'],
	'title' => $attrib['buttontitle'],
	'tabindex' => '0',
	'innerclass' => 'inner',
	));

	$reset_button = $this->button(array(
	'type' => 'link',
	'command' => $attrib['reset-command'] ?: 'reset-search',
	'class' => 'button reset',
	'label' => 'resetsearch',
	'title' => 'resetsearch',
	'tabindex' => '0',
	'innerclass' => 'inner',
	));

	$out = html::div(array(
	'role' => 'search',
	'aria-labelledby' => $attrib['label'] ? 'aria-label-' . $attrib['label'] : null,
	'class' => $attrib['wrapper'],
	), "$header$out\n$reset_button\n$options_button\n$search_button");
	}

	return $out;
	}

	/**
	* Builder for GUI object 'message'
	*
	* @param array Named tag parameters
	* @return string HTML code for the gui object
	*/
	protected function message_container($attrib)
	{
	if (isset($attrib['id']) === false) {
	$attrib['id'] = 'rcmMessageContainer';
	}

	$this->add_gui_object('message', $attrib['id']);

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

	/**
	* GUI object 'charsetselector'
	*
	* @param array $attrib Named parameters for the select tag
	*
	* @return string HTML code for the gui object
	*/
	public function charset_selector($attrib)
	{
	// pass the following attributes to the form class
	$field_attrib = array('name' => '_charset');
	foreach ($attrib as $attr => $value) {
	if (in_array($attr, array('id', 'name', 'class', 'style', 'size', 'tabindex'))) {
	$field_attrib[$attr] = $value;
	}
	}

	$charsets = array(
	'UTF-8' => 'UTF-8 ('.$this->app->gettext('unicode').')',
	'US-ASCII' => 'ASCII ('.$this->app->gettext('english').')',
	'ISO-8859-1' => 'ISO-8859-1 ('.$this->app->gettext('westerneuropean').')',
	'ISO-8859-2' => 'ISO-8859-2 ('.$this->app->gettext('easterneuropean').')',
	'ISO-8859-4' => 'ISO-8859-4 ('.$this->app->gettext('baltic').')',
	'ISO-8859-5' => 'ISO-8859-5 ('.$this->app->gettext('cyrillic').')',
	'ISO-8859-6' => 'ISO-8859-6 ('.$this->app->gettext('arabic').')',
	'ISO-8859-7' => 'ISO-8859-7 ('.$this->app->gettext('greek').')',
	'ISO-8859-8' => 'ISO-8859-8 ('.$this->app->gettext('hebrew').')',
	'ISO-8859-9' => 'ISO-8859-9 ('.$this->app->gettext('turkish').')',
	'ISO-8859-10' => 'ISO-8859-10 ('.$this->app->gettext('nordic').')',
	'ISO-8859-11' => 'ISO-8859-11 ('.$this->app->gettext('thai').')',
	'ISO-8859-13' => 'ISO-8859-13 ('.$this->app->gettext('baltic').')',
	'ISO-8859-14' => 'ISO-8859-14 ('.$this->app->gettext('celtic').')',
	'ISO-8859-15' => 'ISO-8859-15 ('.$this->app->gettext('westerneuropean').')',
	'ISO-8859-16' => 'ISO-8859-16 ('.$this->app->gettext('southeasterneuropean').')',
	'WINDOWS-1250' => 'Windows-1250 ('.$this->app->gettext('easterneuropean').')',
	'WINDOWS-1251' => 'Windows-1251 ('.$this->app->gettext('cyrillic').')',
	'WINDOWS-1252' => 'Windows-1252 ('.$this->app->gettext('westerneuropean').')',
	'WINDOWS-1253' => 'Windows-1253 ('.$this->app->gettext('greek').')',
	'WINDOWS-1254' => 'Windows-1254 ('.$this->app->gettext('turkish').')',
	'WINDOWS-1255' => 'Windows-1255 ('.$this->app->gettext('hebrew').')',
	'WINDOWS-1256' => 'Windows-1256 ('.$this->app->gettext('arabic').')',
	'WINDOWS-1257' => 'Windows-1257 ('.$this->app->gettext('baltic').')',
	'WINDOWS-1258' => 'Windows-1258 ('.$this->app->gettext('vietnamese').')',
	'ISO-2022-JP' => 'ISO-2022-JP ('.$this->app->gettext('japanese').')',
	'ISO-2022-KR' => 'ISO-2022-KR ('.$this->app->gettext('korean').')',
	'ISO-2022-CN' => 'ISO-2022-CN ('.$this->app->gettext('chinese').')',
	'EUC-JP' => 'EUC-JP ('.$this->app->gettext('japanese').')',
	'EUC-KR' => 'EUC-KR ('.$this->app->gettext('korean').')',
	'EUC-CN' => 'EUC-CN ('.$this->app->gettext('chinese').')',
	'BIG5' => 'BIG5 ('.$this->app->gettext('chinese').')',
	'GB2312' => 'GB2312 ('.$this->app->gettext('chinese').')',
	'KOI8-R' => 'KOI8-R ('.$this->app->gettext('cyrillic').')',
	);

	if ($post = rcube_utils::get_input_value('_charset', rcube_utils::INPUT_POST)) {
	$set = $post;
	}
	else if (!empty($attrib['selected'])) {
	$set = $attrib['selected'];
	}
	else {
	$set = $this->get_charset();
	}

	$set = strtoupper($set);
	if (!isset($charsets[$set]) && preg_match('/^[A-Z0-9-]+$/', $set)) {
	$charsets[$set] = $set;
	}

	$select = new html_select($field_attrib);
	$select->add(array_values($charsets), array_keys($charsets));

	return $select->show($set);
	}

	/**
	* Include content from config/about.<LANG>.html if available
	*/
	protected function about_content($attrib)
	{
	$content = '';
	$filenames = array(
	'about.' . $_SESSION['language'] . '.html',
	'about.' . substr($_SESSION['language'], 0, 2) . '.html',
	'about.html',
	);
	foreach ($filenames as $file) {
	$fn = RCUBE_CONFIG_DIR . $file;
	if (is_readable($fn)) {
	$content = file_get_contents($fn);
	$content = $this->parse_conditions($content);
	$content = $this->parse_xml($content);
	break;
	}
	}

	return $content;
	}

	/**
	* Get logo URL for current template based on skin_logo config option
	*
	* @param string $name Name of the logo to check for
	* default is current template
	* @param boolean $strict True if logo should only be returned for specific template
	*
	* @return string image URL
	*/
	protected function get_template_logo($name = null, $strict = false)
	{
	$template_logo = null;

	// Use current template if none provided
	if (!$name) {
	$name = $this->template_name;
	}

	$template_names = array(
	$this->skin_name . ':' . $name,
	$this->skin_name . ':*',
	$name,
	'*',
	);

	// If strict matching then remove wildcard options
	if ($strict) {
	$template_names = preg_grep("/\*$/", $template_names, PREG_GREP_INVERT);
	}

	if ($logo = $this->config->get('skin_logo')) {
	if (is_array($logo)) {
	foreach ($template_names as $key) {
	if (isset($logo[$key])) {
	$template_logo = $logo[$key];
	break;
	}
	}
	}
	else {
	$template_logo = $logo;
	}
	}

	return $template_logo;
	}
	}

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