<?php
/* For licensing terms, see /license.txt */
/**
 * Responses to AJAX calls
 */

require_once '../global.inc.php';

api_protect_course_script(true);

$action = $_REQUEST['a'];

switch ($action) {    
    case 'check_url':
        if (api_is_allowed_to_edit(null, true)) {
     	    $url = $_REQUEST['url'];
     	                
     	    //Check if curl is available     	    
     	    if  (!in_array('curl', get_loaded_extensions())) {
                echo '';
                exit;
     	    }
            // set URL and other appropriate options            
            $defaults = array(
                CURLOPT_URL => $url,
                CURLOPT_HEADER => 0,
                CURLOPT_RETURNTRANSFER => TRUE,
                CURLOPT_TIMEOUT => 4
            );
            //create a new cURL resource
            
            $ch = curl_init();
            curl_setopt_array($ch, $defaults);        
            
            // grab URL and pass it to the browser
            $result = curl_exec($ch);    
            
            // close cURL resource, and free up system resources
            curl_close($ch);
            
            if($result) {
                echo Display::return_icon('accept.png', get_lang('Ok'));
            } else {
                echo Display::return_icon('wrong.gif', get_lang('Wrong'));
            }
        }
        break;
    default:
        echo '';
}
exit;