<?php
/**
 * @package         Components Anywhere
 * @version         4.10.1
 * 
 * @author          Peter van Westen <info@regularlabs.com>
 * @link            http://regularlabs.com
 * @copyright       Copyright © 2023 Regular Labs All Rights Reserved
 * @license         http://www.gnu.org/licenses/gpl-2.0.html GNU/GPL
 */

namespace RegularLabs\Plugin\System\ComponentsAnywhere;

defined('_JEXEC') or die;

use Joomla\CMS\Factory as JFactory;

class Curl
{
    public static function get($url, $cookies = [])
    {
        if ( ! function_exists('curl_init'))
        {
            return false;
        }

        $params = Params::get();

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_HEADER, false);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_TIMEOUT, $params->timeout);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $params->timeout);

        // Adding a valid user agent string, otherwise some feed-servers returning an error
        curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:41.0) Gecko/20100101 Firefox/41.0');

        curl_setopt($ch, CURLOPT_AUTOREFERER, true);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

        if ( ! empty($cookies))
        {
            $session = session_name() . '=' . session_id();

            // Update current session in cookies because of not being able to overwrite it
            if (($key = array_search($session, $cookies)) !== false)
            {
                unset($cookies[$key]);
                $cookies[] = session_name() . '=' . md5(session_id() . time());
            }

            curl_setopt($ch, CURLOPT_COOKIESESSION, false); // False to keep all cookies of previous session
            curl_setopt($ch, CURLOPT_COOKIE, implode(';', $cookies));
        }

        if ( ! empty($_POST))
        {
            curl_setopt($ch, CURLOPT_POST, true);
            curl_setopt($ch, CURLOPT_POSTFIELDS, $_POST);
        }

        self::setCurlAuthentication($ch);

        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($ch, CURLOPT_MAXREDIRS, 3); // stop after 3 redirects
        $html  = curl_exec($ch);
        $error = curl_error($ch);

        curl_close($ch);

        if (JFactory::getApplication()->input->get('debug_component'))
        {
            echo "\n\n<pre>=======Curl url===================\n";
            print_r($url);
            echo "\n=============Error=============\n";
            print_r($error);
            echo "\n==============HTML============\n";
            print_r($html);
            echo "\n==========================</pre>\n\n";
        }

        if (empty($html) && ! empty($error))
        {
            return Component::createJsonString(
                Protect::getMessageCommentTag('CURL Error: ' . $error)
            );
        }

        return $html;
    }

    private static function setCurlAuthentication(&$ch)
    {
        $params = Params::get();

        if ($params->use_negotiate_authentication)
        {
            curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_GSSNEGOTIATE);
            curl_setopt($ch, CURLOPT_USERPWD, $params->negotiate_login . ':' . $params->negotiate_password);

            return;
        }

        if ( ! $credentials = Data::getAuthenticationCredentials())
        {
            return;
        }

        [$username, $password] = $credentials;

        // Send authentication
        curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
        curl_setopt($ch, CURLOPT_USERPWD, $username . ':' . $password); // set referer on redirect
    }
}