export.php

<?php
/*
* 2007-2013 PrestaShop 
*
* NOTICE OF LICENSE
*
* This source file is subject to the Academic Free License (AFL 3.0)
* that is bundled with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://opensource.org/licenses/afl-3.0.php
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@prestashop.com so we can send you a copy immediately.
*
* DISCLAIMER
*
* Do not edit or add to this file if you wish to upgrade PrestaShop to newer
* versions in the future. If you wish to customize PrestaShop for your
* needs please refer to http://www.prestashop.com for more information.
*
*  @author PrestaShop SA <contact@prestashop.com>
*  @copyright  2007-2013 PrestaShop SA
*  @license    http://opensource.org/licenses/afl-3.0.php  Academic Free License (AFL 3.0)
*  International Registred Trademark & Property of PrestaShop SA
*/

include_once('../../config/config.inc.php');
include_once('../../init.php');
include_once(dirname(__FILE__).'/twenga.php');

if ((sha1(Configuration::get('TWENGA_TOKEN')._COOKIE_KEY_)) != Tools::getValue('twenga_token'))
	die('FATAL ERROR : INVALID TOKEN');

@ini_set('memory_limit', '300M');
if (!ini_get('safe_mode'))
	@set_time_limit(300);
	
require_once realpath(dirname(__FILE__).'/lib/service/BuildCatalog.php');
$oBuildCatalog = new BuildCatalog();

$sFilename = 'twenga_last_modified.txt';
$bCleIsDiff = true;
$dDateHeader = gmdate( 'D, d M Y H:i:s' );
$sVersionGenerated = $oBuildCatalog->getVersionGenerated();

if(file_exists($sFilename)){
	$sHandle = fopen($sFilename, 'r');
	$sContentFile = fgets($sHandle);
	$aDataFile = explode('_', $sContentFile);
	if(is_array($aDataFile) && count($aDataFile) > 1){
		if($aDataFile[1] == $sVersionGenerated){
			$bCleIsDiff = false;
			$dDateHeader = $aDataFile[0];
		}
	}
	fclose($sHandle);
}

if($bCleIsDiff){
	$sHandle = fopen($sFilename, 'w+');
	fwrite($sHandle, $dDateHeader.'_'.$sVersionGenerated);
	fclose($sHandle);
}

header( 'Last-Modified: ' . $dDateHeader . ' GMT' );	 
header("Content-type: text/xml; charset=utf-8");
$oBuildCatalog->_buildXML();