<?php
/**
 * @package   	JCE
 * @copyright 	Copyright © 2009-2011 Ryan Demmer. All rights reserved.
 * @license   	GNU/GPL 2 or later - http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * JCE is free software. This version may have been modified pursuant
 * to the GNU General Public License, and as distributed it includes or
 * is derivative of works licensed under the GNU General Public License or
 * other free or open source software licenses.
 */

defined('_JEXEC') or die('RESTRICTED');

// Load class dependencies
require_once(WF_EDITOR_LIBRARIES .DS. 'classes' .DS. 'plugin.php');

class WFPreviewPlugin extends WFEditorPlugin 
{
	/**
	* Constructor activating the default information of the class
	*
	* @access	protected
	*/
	function __construct()
	{
		parent::__construct();
		
		$request = WFRequest::getInstance();
		// Setup plugin XHR callback functions 
		$request->setRequest(array($this, 'showPreview'));
		
		$this->execute();
	}
	/**
	 * Returns a reference to a plugin object
	 *
	 * This method must be invoked as:
	 * 		<pre>  $advlink =AdvLink::getInstance();</pre>
	 *
	 * @access	public
	 * @return	JCE  The editor object.
	 * @since	1.5
	 */
	function &getInstance()
	{
		static $instance;

		if (!is_object($instance)) {
			$instance = new WFPreviewPlugin();
		}
		return $instance;
	}
	
	/**
	 * Display Preview content
	 * @return void
	 */
	public function showPreview()
	{						
		$db 		= JFactory::getDBO();
		$user		= JFactory::getUser();
		$dispatcher	= JDispatcher::getInstance();
		$language 	= JFactory::getLanguage();
		
		// reset document type
		$document	= &JFactory::getDocument();
		$document->setType('html');
		// required by module loadposition
		jimport('joomla.application.module.helper');
		
		wfimport('admin.helpers.extension');

		// Get variables
		$component_id 	= JRequest::getInt('component_id');
		// get post data
		$data   		= JRequest::getVar('data', '', 'POST', 'STRING', JREQUEST_ALLOWRAW );
		
		// cleanup data
		$data   	= preg_replace(array('#<!DOCTYPE([^>]+)>#i', '#<(head|title|meta)([^>]*)>([\w\W]+)<\/1>#i', '#<\/?(html|body)([^>]*)>#i'), '', rawurldecode($data));

		$component 	= WFExtensionHelper::getComponent($component_id);

		$params  	= new JParameter($component->params);
		$article 	= JTable::getInstance('content');

		$article->id			= 0;
		$article->created_by	= $user->get('id');
		$article->parameters	= new JParameter('');
		$article->text			= $data;
		
		$limitstart = 0;
		JPluginHelper::importPlugin('content');
		
		require_once(JPATH_SITE .DS. 'components' .DS. 'com_content' .DS. 'helpers' .DS. 'route.php');
		
		// set error reporting to error only
		error_reporting(E_ERROR);

		$dispatcher->trigger('onPrepareContent', array (& $article, & $params, $limitstart));

		$this->processURLS($article);

		return $article->text;
	}
	/**
	 * Convert URLs
	 * @param object $article Article object
	 * @return void
	 */
	private function processURLS(&$article)
	{
		$base 		= JURI::root(true).'/';
		$buffer 	= $article->text;
		
		$protocols 	= '[a-zA-Z0-9]+:'; //To check for all unknown protocals (a protocol must contain at least one alpahnumeric fillowed by :
      	$regex     	= '#(src|href)="(?!/|'.$protocols.'|\#|\')([^"]*)"#m';
        $buffer    	= preg_replace($regex, "$1=\"$base\$2\"", $buffer);
		$regex     	= '#(onclick="window.open\(\')(?!/|'.$protocols.'|\#)([^/]+[^\']*?\')#m';
		$buffer    	= preg_replace($regex, '$1'.$base.'$2', $buffer);
		
		// ONMOUSEOVER / ONMOUSEOUT
		$regex 		= '#(onmouseover|onmouseout)="this.src=([\']+)(?!/|'.$protocols.'|\#|\')([^"]+)"#m';
		$buffer 	= preg_replace($regex, '$1="this.src=$2'. $base .'$3$4"', $buffer);
		
		// Background image
		$regex 		= '#style\s*=\s*[\'\"](.*):\s*url\s*\([\'\"]?(?!/|'.$protocols.'|\#)([^\)\'\"]+)[\'\"]?\)#m';
		$buffer 	= preg_replace($regex, 'style="$1: url(\''. $base .'$2$3\')', $buffer);
		
		// OBJECT <param name="xx", value="yy"> -- fix it only inside the <param> tag
		$regex 		= '#(<param\s+)name\s*=\s*"(movie|src|url)"[^>]\s*value\s*=\s*"(?!/|'.$protocols.'|\#|\')([^"]*)"#m';
		$buffer 	= preg_replace($regex, '$1name="$2" value="' . $base . '$3"', $buffer);
		
		// OBJECT <param value="xx", name="yy"> -- fix it only inside the <param> tag
		$regex 		= '#(<param\s+[^>]*)value\s*=\s*"(?!/|'.$protocols.'|\#|\')([^"]*)"\s*name\s*=\s*"(movie|src|url)"#m';
		$buffer 	= preg_replace($regex, '<param value="'. $base .'$2" name="$3"', $buffer);

		// OBJECT data="xx" attribute -- fix it only in the object tag
		$regex 		= '#(<object\s+[^>]*)data\s*=\s*"(?!/|'.$protocols.'|\#|\')([^"]*)"#m';
		$buffer 	= preg_replace($regex, '$1data="' . $base . '$2"$3', $buffer);
		
		$article->text = $buffer;
	}
}