rcube_template.php
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rcube_template.php
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	<?php

	/*
	+-----------------------------------------------------------------------+
	\| program/include/rcube_template.php \|
	\| \|
	\| This file is part of the RoundCube Webmail client \|
	\| Copyright (C) 2006-2009, RoundCube Dev. - Switzerland \|
	\| Licensed under the GNU GPL \|
	\| \|
	\| PURPOSE: \|
	\| Class to handle HTML page output using a skin template. \|
	\| Extends rcube_html_page class from rcube_shared.inc \|
	\| \|
	+-----------------------------------------------------------------------+
	\| Author: Thomas Bruederli <roundcube@gmail.com> \|
	+-----------------------------------------------------------------------+

	$Id$

	*/


	/**
	* Class to create HTML page output using a skin template
	*
	* @package View
	* @todo Documentation
	* @uses rcube_html_page
	*/
	class rcube_template extends rcube_html_page
	{
	var $app;
	var $config;
	var $framed = false;
	var $pagetitle = '';
	var $message = null;
	var $env = array();
	var $js_env = array();
	var $js_commands = array();
	var $object_handlers = array();

	public $type = 'html';
	public $ajax_call = false;

	/**
	* Constructor
	*
	* @todo Use jQuery's $(document).ready() here.
	* @todo Replace $this->config with the real rcube_config object
	*/
	public function __construct($task, $framed = false)
	{
	parent::__construct();

	$this->app = rcmail::get_instance();
	$this->config = $this->app->config->all();
	$this->browser = new rcube_browser();

	//$this->framed = $framed;
	$this->set_env('task', $task);
	$this->set_env('request_token', $this->app->get_request_token());

	// load the correct skin (in case user-defined)
	$this->set_skin($this->config['skin']);

	// add common javascripts
	$javascript = 'var '.JS_OBJECT_NAME.' = new rcube_webmail();';

	// don't wait for page onload. Call init at the bottom of the page (delayed)
	$javascript_foot = '$(document).ready(function(){ '.JS_OBJECT_NAME.'.init(); });';

	$this->add_script($javascript, 'head_top');
	$this->add_script($javascript_foot, 'foot');
	$this->scripts_path = 'program/js/';
	$this->include_script('jquery-1.4.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'),
	'username' => array($this, 'current_username'),
	'message' => array($this, 'message_container'),
	'charsetselector' => array($this, 'charset_selector'),
	));
	}

	/**
	* Set environment variable
	*
	* @param string Property name
	* @param mixed Property value
	* @param boolean 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;
	}
	}


	/**
	* Set page title variable
	*/
	public function set_pagetitle($title)
	{
	$this->pagetitle = $title;
	}


	/**
	* Getter for the current page title
	*
	* @return string The page title
	*/
	public function get_pagetitle()
	{
	if (!empty($this->pagetitle)) {
	$title = $this->pagetitle;
	}
	else if ($this->env['task'] == 'login') {
	$title = rcube_label(array('name' => 'welcome', 'vars' => array('product' => $this->config['product_name'])));
	}
	else {
	$title = ucfirst($this->env['task']);
	}

	return $title;
	}


	/**
	* Set skin
	*/
	public function set_skin($skin)
	{
	if (!empty($skin) && is_dir('skins/'.$skin) && is_readable('skins/'.$skin))
	$skin_path = 'skins/'.$skin;
	else
	$skin_path = $this->config['skin_path'] ? $this->config['skin_path'] : 'skins/default';

	$this->app->config->set('skin_path', $skin_path);
	$this->config['skin_path'] = $skin_path;
	}

	/**
	* Check if a specific template exists
	*
	* @param string Template name
	* @return boolean True if template exists
	*/
	public function template_exists($name)
	{
	$filename = $this->config['skin_path'] . '/templates/' . $name . '.html';

	return (is_file($filename) && is_readable($filename));
	}

	/**
	* Register a template object handler
	*
	* @param string Object name
	* @param string Function name to call
	* @return void
	*/
	public function add_handler($obj, $func)
	{
	$this->object_handlers[$obj] = $func;
	}

	/**
	* Register a list of template object handlers
	*
	* @param array Hash array with object=>handler pairs
	* @return void
	*/
	public function add_handlers($arr)
	{
	$this->object_handlers = array_merge($this->object_handlers, $arr);
	}

	/**
	* Register a GUI object to the client script
	*
	* @param string Object name
	* @param string Object ID
	* @return void
	*/
	public function add_gui_object($obj, $id)
	{
	$this->add_script(JS_OBJECT_NAME.".gui_object('$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[] = $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->command('add_label', $name, rcube_label($name));
	}
	}


	/**
	* Invoke display_message command
	*
	* @param string Message to display
	* @param string Message type [notice\|confirm\|error]
	* @param array Key-value pairs to be replaced in localized text
	* @param boolean Override last set message
	* @uses self::command()
	*/
	public function show_message($message, $type='notice', $vars=null, $override=true)
	{
	if ($override \|\| !$this->message) {
	$this->message = $message;
	$this->command(
	'display_message',
	rcube_label(array('name' => $message, 'vars' => $vars)),
	$type);
	}
	}


	/**
	* Delete all stored env variables and commands
	*
	* @return void
	* @uses rcube_html::reset()
	* @uses self::$env
	* @uses self::$js_env
	* @uses self::$js_commands
	* @uses self::$object_handlers
	*/
	public function reset()
	{
	$this->env = array();
	$this->js_env = array();
	$this->js_commands = array();
	$this->object_handlers = array();
	parent::reset();
	}


	/**
	* Redirect to a certain url
	*
	* @param mixed Either a string with the action or url parameters as key-value pairs
	* @see rcmail::url()
	*/
	public function redirect($p = array())
	{
	$location = $this->app->url($p);
	header('Location: ' . $location);
	exit;
	}


	/**
	* Send the request output to the client.
	* This will either parse a skin tempalte or send an AJAX response
	*
	* @param string Template name
	* @param boolean 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')) {
	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 = $templ == 'iframe' ? true : $this->framed;
	$this->write();
	}

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

	if ($exit) {
	exit;
	}
	}

	/**
	* Process template and write to stdOut
	*
	* @param string HTML template
	* @see rcube_html_page::write()
	* @override
	*/
	public function write($template = '')
	{
	// unlock interface after iframe load
	if ($this->framed) {
	array_unshift($this->js_commands, array('set_busy', false));
	}
	// write all env variables to client
	$js = $this->framed ? "if(window.parent) {\n" : '';
	$js .= $this->get_js_commands() . ($this->framed ? ' }' : '');
	$this->add_script($js, 'head_top');

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

	// call super method
	parent::write($template, $this->config['skin_path']);
	}

	/**
	* Parse a specific skin template and deliver to stdout
	*
	* Either returns nothing, or exists hard (exit();)
	*
	* @param string Template name
	* @param boolean Exit script
	* @return void
	* @link http://php.net/manual/en/function.exit.php
	*/
	private function parse($name = 'main', $exit = true)
	{
	$skin_path = $this->config['skin_path'];
	$plugin = false;

	$temp = explode(".", $name, 2);
	if (count($temp) > 1) {
	$plugin = $temp[0];
	$name = $temp[1];
	$skin_dir = $plugin . '/skins/' . $this->config['skin'];
	$skin_path = $this->app->plugins->dir . $skin_dir;
	if (!is_dir($skin_path)) { // fallback to default skin
	$skin_dir = $plugin . '/skins/default';
	$skin_path = $this->app->plugins->dir . $skin_dir;
	}
	}

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

	// read template file
	if (($templ = @file_get_contents($path)) === false) {
	raise_error(array(
	'code' => 501,
	'type' => 'php',
	'line' => __LINE__,
	'file' => __FILE__,
	'message' => 'Error loading template for '.$name
	), true, true);
	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' => $name, 'content' => $output));

	// add debug console
	if ($this->config['debug_level'] & 8) {
	$this->add_footer('<div id="console" style="position:absolute;top:5px;left:5px;width:405px;padding:2px;background:white;z-index:9000;">
	<a href="#toggle" onclick="con=document.getElementById(\'dbgconsole\');con.style.display=(con.style.display==\'none\'?\'block\':\'none\');return false">console</a>
	<form action="/" name="debugform" style="display:inline"><textarea name="console" id="dbgconsole" rows="20" cols="40" wrap="off" style="display:none;width:400px;border:none;font-size:x-small" spellcheck="false"></textarea></form></div>'
	);
	}

	$output = $this->parse_with_globals($hook['content']);
	$this->write(trim($output));
	if ($exit) {
	exit;
	}
	}


	/**
	* Return executable javascript code for all registered commands
	*
	* @return string $out
	*/
	private function get_js_commands()
	{
	$out = '';
	if (!$this->framed && !empty($this->js_env)) {
	$out .= JS_OBJECT_NAME . '.set_env('.json_serialize($this->js_env).");\n";
	}
	foreach ($this->js_commands as $i => $args) {
	$method = array_shift($args);
	foreach ($args as $i => $arg) {
	$args[$i] = json_serialize($arg);
	}
	$parent = $this->framed \|\| preg_match('/^parent\./', $method);
	$out .= sprintf(
	"%s.%s(%s);\n",
	($parent ? 'if(window.parent && parent.'.JS_OBJECT_NAME.') parent.' : '') . JS_OBJECT_NAME,
	preg_replace('/^parent\./', '', $method),
	implode(',', $args)
	);
	}

	return $out;
	}

	/**
	* Make URLs starting with a slash point to skin directory
	*
	* @param string Input string
	* @return string
	*/
	public function abs_url($str)
	{
	return preg_replace('/^\//', $this->config['skin_path'].'/', $str);
	}


	/*** Template parsing methods ***/

	/**
	* Replace all strings ($varname)
	* with the content of the according global variable.
	*/
	private function parse_with_globals($input)
	{
	$GLOBALS['__version'] = Q(RCMAIL_VERSION);
	$GLOBALS['__comm_path'] = Q($this->app->comm_path);
	return preg_replace_callback('/\$(__[a-z0-9_\-]+)/',
	array($this, 'globals_callback'), $input);
	}

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

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

	/**
	* Parse for conditional tags
	*
	* @param string $input
	* @return string
	*/
	private function parse_conditions($input)
	{
	$matches = preg_split('/<roundcube:(if\|elseif\|else\|endif)\s+([^>]+)>/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]);
	}
	$attrib = parse_attrib_string($matches[2]);
	if (isset($attrib['condition'])) {
	$condmet = $this->check_condition($attrib['condition']);
	$submatches = preg_split('/<roundcube:(elseif\|else\|endif)\s+([^>]+)>/is', $matches[3], 2, PREG_SPLIT_DELIM_CAPTURE);
	if ($condmet) {
	$result = $submatches[0];
	$result.= ($submatches[1] != 'endif' ? preg_replace('/.*<roundcube:endif\s+[^>]+>/Uis', '', $submatches[3], 1) : $submatches[3]);
	}
	else {
	$result = "<roundcube:$submatches[1] $submatches[2]>" . $submatches[3];
	}
	return $matches[0] . $this->parse_conditions($result);
	}
	raise_error(array(
	'code' => 500,
	'type' => 'php',
	'line' => __LINE__,
	'file' => __FILE__,
	'message' => "Unable to parse conditional tag " . $matches[2]
	), true, false);
	}
	return $input;
	}


	/**
	* Determines if a given condition is met
	*
	* @todo Get rid off eval() once I understand what this does.
	* @todo Extend this to allow real conditions, not just "set"
	* @param string Condition statement
	* @return boolean True if condition is met, False if not
	*/
	private function check_condition($condition)
	{
	return eval("return (".$this->parse_expression($condition).");");
	}


	/**
	*
	*/
	private function alter_form_tag($matches)
	{
	$out = $matches[0];
	$attrib = parse_attrib_string($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;
	}


	/**
	* Parses expression and replaces variables
	*
	* @param string Expression statement
	* @return string Expression statement
	*/
	private function parse_expression($expression)
	{
	return 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'
	),
	array(
	"\$_SESSION['\\1']",
	"\$this->app->config->get('\\1',get_boolean('\\3'))",
	"\$this->env['\\1']",
	"get_input_value('\\1', RCUBE_INPUT_GPC)",
	"\$_COOKIE['\\1']",
	"\$this->browser->{'\\1'}"
	),
	$expression);
	}


	/**
	* Search for special tags in input and replace them
	* with the appropriate content
	*
	* @param string Input string to parse
	* @return string Altered input string
	* @todo Use DOM-parser to traverse template HTML
	* @todo Maybe a cache.
	*/
	private 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 array of preg_replace_callback
	* @return string Tag/Object content
	*/
	private function xml_command($matches)
	{
	$command = strtolower($matches[1]);
	$attrib = parse_attrib_string($matches[2]);

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

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

	// show a label
	case 'label':
	if ($attrib['name'] \|\| $attrib['command']) {
	return Q(rcube_label($attrib + array('vars' => array('product' => $this->config['product_name']))));
	}
	break;

	// include a file
	case 'include':
	$path = realpath($this->config['skin_path'].$attrib['file']);
	if (is_readable($path)) {
	if ($this->config['skin_include_php']) {
	$incl = $this->include_php($path);
	}
	else {
	$incl = file_get_contents($path);
	}
	$incl = $this->parse_conditions($incl);
	return $this->parse_xml($incl);
	}
	break;

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

	// 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 = '';

	// we are calling a class/method
	if (($handler = $this->object_handlers[$object]) && is_array($handler)) {
	if ((is_object($handler[0]) && method_exists($handler[0], $handler[1])) \|\|
	(is_string($handler[0]) && class_exists($handler[0])))
	$content = call_user_func($handler, $attrib);
	}
	// execute object handler function
	else if (function_exists($handler)) {
	$content = call_user_func($handler, $attrib);
	}
	else if ($object == 'productname') {
	$name = !empty($this->config['product_name']) ? $this->config['product_name'] : 'RoundCube Webmail';
	$content = Q($name);
	}
	else if ($object == 'version') {
	$ver = (string)RCMAIL_VERSION;
	if (is_file(INSTALL_PATH . '.svn/entries')) {
	if (preg_match('/Revision:\s(\d+)/', @shell_exec('svn info'), $regs))
	$ver .= ' [SVN r'.$regs[1].']';
	}
	$content = Q($ver);
	}
	else if ($object == 'steptitle') {
	$content = Q($this->get_pagetitle());
	}
	else if ($object == 'pagetitle') {
	$title = !empty($this->config['product_name']) ? $this->config['product_name'].' :: ' : '';
	$title .= $this->get_pagetitle();
	$content = Q($title);
	}

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

	// return code for a specified eval expression
	case 'exp':
	$value = $this->parse_expression($attrib['expression']);
	return eval("return Q($value);");

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

	switch ($var[0]) {
	case 'env':
	$value = $this->env[$name];
	break;
	case 'config':
	$value = $this->config[$name];
	if (is_array($value) && $value[$_SESSION['imap_host']]) {
	$value = $value[$_SESSION['imap_host']];
	}
	break;
	case 'request':
	$value = get_input_value($name, RCUBE_INPUT_GPC);
	break;
	case 'session':
	$value = $_SESSION[$name];
	break;
	case 'cookie':
	$value = htmlspecialchars($_COOKIE[$name]);
	break;
	case 'browser':
	$value = $this->browser->{$name};
	break;
	}

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

	return Q($value);
	break;
	}
	return '';
	}

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

	return $out;
	}

	/**
	* Create and register a button
	*
	* @param array 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 $sa_buttons = array();
	static $s_button_count = 100;

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

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

	// try to find out the button type
	if ($attrib['type']) {
	$attrib['type'] = strtolower($attrib['type']);
	}
	else {
	$attrib['type'] = ($attrib['image'] \|\| $attrib['imagepas'] \|\| $attrib['imageact']) ? 'image' : 'link';
	}
	$command = $attrib['command'];

	// take the button from the stack
	if ($attrib['name'] && $sa_buttons[$attrib['name']]) {
	$attrib = $sa_buttons[$attrib['name']];
	}
	else if($attrib['image'] \|\| $attrib['imageact'] \|\| $attrib['imagepas'] \|\| $attrib['class']) {
	// add button to button stack
	if (!$attrib['name']) {
	$attrib['name'] = $command;
	}
	if (!$attrib['image']) {
	$attrib['image'] = $attrib['imagepas'] ? $attrib['imagepas'] : $attrib['imageact'];
	}
	$sa_buttons[$attrib['name']] = $attrib;
	}
	else if ($command && $sa_buttons[$command]) {
	// get saved button for this command/name
	$attrib = $sa_buttons[$command];
	}

	if (!$attrib['id']) {
	$attrib['id'] = sprintf('rcmbtn%d', $s_button_count++);
	}
	// get localized text for labels and titles
	if ($attrib['title']) {
	$attrib['title'] = Q(rcube_label($attrib['title'], $attrib['domain']));
	}
	if ($attrib['label']) {
	$attrib['label'] = Q(rcube_label($attrib['label'], $attrib['domain']));
	}
	if ($attrib['alt']) {
	$attrib['alt'] = Q(rcube_label($attrib['alt'], $attrib['domain']));
	}

	// 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');",
	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'] = rcmail_url(null, null, $attrib['command']);
	}
	else if (in_array($attrib['command'], $a_static_commands)) {
	$attrib['href'] = rcmail_url($attrib['command']);
	}
	else if ($attrib['command'] == 'permaurl' && !empty($this->env['permaurl'])) {
	$attrib['href'] = $this->env['permaurl'];
	}
	}

	// overwrite attributes
	if (!$attrib['href']) {
	$attrib['href'] = '#';
	}
	if ($command) {
	$attrib['onclick'] = sprintf(
	"return %s.command('%s','%s',this)",
	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']);
	$link_attrib = array('href', 'onclick', 'title', 'id', 'class', 'style', 'tabindex', 'target');
	}
	else if ($attrib['type']=='input') {
	$attrib['type'] = 'button';

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

	$attrib_str = html::attrib_string(
	$attrib,
	array(
	'type', 'value', 'onclick', 'id', 'class', 'style', 'tabindex'
	)
	);
	$out = sprintf('<input%s disabled="disabled" />', $attrib_str);
	}

	// 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);
	}

	return $out;
	}


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


	/**
	* Create a form tag with the necessary hidden fields
	*
	* @param array Named tag parameters
	* @return string HTML code for the form
	*/
	public function form_tag($attrib, $content = null)
	{
	if ($this->framed \|\| !empty($_REQUEST['_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' => "./", 'method' => "get"),
	$hidden . $content,
	array('id','class','style','name','method','action','enctype','onsubmit'));
	}


	/**
	* Build a form tag with a unique request token
	*
	* @param array Named tag parameters including 'action' and 'task' values which will be put into hidden fields
	* @param string 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']));
	}

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

	// we already have a <form> tag
	if ($attrib['form'])
	return $hidden->show() . $content;
	else
	return $this->form_tag($attrib, $hidden->show() . $content);
	}


	/**
	* GUI object 'username'
	* Showing IMAP username of the current session
	*
	* @param array 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;
	}

	// get e-mail address form default identity
	if ($sql_arr = $this->app->user->get_identity()) {
	$username = $sql_arr['email'];
	}
	else {
	$username = $this->app->user->get_username();
	}

	return $username;
	}


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

	$_SESSION['temp'] = true;

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

	$input_user = new html_inputfield(array('name' => '_user', 'id' => 'rcmloginuser') + $attrib);
	$input_pass = new html_passwordfield(array('name' => '_pass', 'id' => 'rcmloginpwd') + $attrib);
	$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_host = null;

	if (is_array($default_host)) {
	$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 {
	$input_host = null;
	break;
	}
	}
	}
	else if (empty($default_host)) {
	$input_host = new html_inputfield(array('name' => '_host', 'id' => 'rcmloginhost') + $attrib);
	}

	$form_name = !empty($attrib['form']) ? $attrib['form'] : 'form';
	$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', Q(rcube_label('username'))));
	$table->add(null, $input_user->show(get_input_value('_user', RCUBE_INPUT_POST)));

	$table->add('title', html::label('rcmloginpwd', Q(rcube_label('password'))));
	$table->add(null, $input_pass->show());

	// add host selection row
	if (is_object($input_host)) {
	$table->add('title', html::label('rcmloginhost', Q(rcube_label('server'))));
	$table->add(null, $input_host->show(get_input_value('_host', RCUBE_INPUT_POST)));
	}

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

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

	return $out;
	}


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

	$attrib['name'] = '_q';

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

	$input_q = new html_inputfield($attrib);
	$out = $input_q->show();

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

	// add form tag around text field
	if (empty($attrib['form'])) {
	$out = $this->form_tag(array(
	'name' => "rcmqsearchform",
	'onsubmit' => JS_OBJECT_NAME . ".command('search');return false;",
	'style' => "display:inline"),
	$out);
	}

	return $out;
	}


	/**
	* Builder for GUI object 'message'
	*
	* @param array Named tag parameters
	* @return string HTML code for the gui object
	*/
	private 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 Named parameters for the select tag
	* @return string HTML code for the gui object
	*/
	static 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', 'class', 'style', 'size', 'tabindex'))) {
	$field_attrib[$attr] = $value;
	}
	}
	$charsets = array(
	'US-ASCII' => 'ASCII (English)',
	'EUC-JP' => 'EUC-JP (Japanese)',
	'EUC-KR' => 'EUC-KR (Korean)',
	'BIG5' => 'BIG5 (Chinese)',
	'GB2312' => 'GB2312 (Chinese)',
	'ISO-2022-JP' => 'ISO-2022-JP (Japanese)',
	'ISO-8859-1' => 'ISO-8859-1 (Latin-1)',
	'ISO-8859-2' => 'ISO-8895-2 (Central European)',
	'ISO-8859-7' => 'ISO-8859-7 (Greek)',
	'ISO-8859-9' => 'ISO-8859-9 (Turkish)',
	'Windows-1251' => 'Windows-1251 (Cyrillic)',
	'Windows-1252' => 'Windows-1252 (Western)',
	'Windows-1255' => 'Windows-1255 (Hebrew)',
	'Windows-1256' => 'Windows-1256 (Arabic)',
	'Windows-1257' => 'Windows-1257 (Baltic)',
	'UTF-8' => 'UTF-8'
	);

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

	$set = $_POST['_charset'] ? $_POST['_charset'] : $this->get_charset();
	return $select->show($set);
	}

	} // end class rcube_template

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