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<?php
/**
 * @package AkeebaBackup
 * @subpackage SRP
 * @copyright Copyright (c)2011 Nicholas K. Dionysopoulos
 * @license GNU General Public License version 3, or later
 * @version $Id: srp.php 670 2011-05-30 10:41:18Z nikosdion $
 * @since 3.3
 */

defined('_JEXEC') or die();

// PHP version check
if(defined('PHP_VERSION')) {
	$version = PHP_VERSION;
} elseif(function_exists('phpversion')) {
	$version = phpversion();
} else {
	$version = '5.0.0'; // all bets are off!
}
if(!version_compare($version, '5.0.0', '>=')) return;

// Make sure Akeeba Backup is installed
if(!file_exists(JPATH_ADMINISTRATOR.'/components/com_akeeba')) {
	return;
}

jimport('joomla.application.plugin');

class plgSystemSRP extends JPlugin
{
	private $_enabled = true;
	
	public function __construct(&$subject, $config = array()) {
		parent::__construct($subject, $config);
		
		// Akeeba Backup version check
		jimport('joomla.filesystem.file');
		$file = JPATH_ROOT.'/administrator/components/com_akeeba/version.php';
		if(!JFile::exists($file)) {
			// My local dev build doesn't have this file, so I cheat
			if(!JFile::exists(dirname($file).'/akeeba.xml')) {
				$this->_enabled = false;
			}
		} else {
			require_once $file;
			if(!version_compare(AKEEBA_VERSION, '3.3.a1', 'ge')) {
				// Check for dev release
				if(substr(AKEEBA_VERSION,0,3) == 'svn') {
					$svnVersion = (int)substr(AKEEBA_VERSION,3);
					$this->_enabled = $svnVersion >= 620;
				} else {
					$this->_enabled = false;
				}
			}
		}
	}
	
	public function onSRPEnabled()
	{
		return $this->_enabled;
	}
	
	public function onAfterInitialise()
	{
		// Make sure we are enabled (supported Akeeba Backup version)
		if(!$this->_enabled) return;
		
		// Make sure this is the back-end
		$app = JFactory::getApplication();
		if(!in_array($app->getName(),array('administrator','admin'))) return;
		
		// If the user tried to access Joomla!'s com_installer, hijack his
		// request and forward him to our private, improved implementation!
		$component = JRequest::getCmd('option','');
		$task = JRequest::getCmd('task','installform');
		$skipsrp = JRequest::getInt('skipsrp', 0);
		$type = JRequest::getCmd('type', '');
		$view = JRequest::getCmd('view', '');
		
		if( ($component == 'com_installer') && (($task == 'installform')||($task == 'installer')) && ($skipsrp != 1) && (empty($type)) ) {
			if(version_compare(JVERSION,'1.6.0','ge')) {
				if(!empty($view) && ($view != 'install') && ($view != 'install.install')) {
					return;
				}
			}
			JRequest::setVar('option','com_akeeba','GET');
			JRequest::setVar('view','installer','GET');
			JRequest::setVar('task','installform','GET');
		} elseif(($component == 'com_akeeba') && ($task == 'manage') && !empty($type)) {
			$app = JFactory::getApplication();
			$app->redirect('index.php?option=com_installer&task=manage&type='.$type);
		}
	}
}