remote.php

<?php

/**
 * @author     Branko Wilhelm <branko.wilhelm@gmail.com>
 * @link       http://www.z-index.net
 * @copyright  (c) 2013 - 2014 Branko Wilhelm
 * @license    GNU/GPLv3 http://www.gnu.org/licenses/gpl-3.0.html
 */

defined('_JEXEC') or die;

class plgContentRemote extends JPlugin
{

    public function onContentPrepare($context, &$row, &$params, $page = 0)
    {

        if (JString::strpos($row->text, '{remote') === false) {
            return true;
        }

        preg_match_all('#{remote\s+(.*?)}#i', $row->text, $matches, PREG_SET_ORDER);

        if (!empty($matches)) {
            foreach ($matches as $match) {
                $row->text = JString::str_ireplace($match[0], $this->remote($match[1]), $row->text);
            }
        }
    }

    private function remote($url)
    {
        if (!filter_var($url, FILTER_VALIDATE_URL)) {
            return 'not a valid url: ' . $url;
        }

        $cache = JFactory::getCache('remote', 'output');
        $cache->setCaching(1);
        $cache->setLifeTime($this->params->get('cache_time', 60) * 60);

        $key = md5($url);

        if (!$result = $cache->get($key)) {
            try {
                $http = JHttpFactory::getHttp();

                $result = $http->get($url, null, $this->params->get('timeout', 10));
            } catch (Exception $e) {
                return $e->getMessage();
            }

            $cache->store($result, $key);
        }

        if ($result->code != 200) {
            return __CLASS__ . ' HTTP-Status ' . JHtml::_('link', 'http://wikipedia.org/wiki/List_of_HTTP_status_codes#' . $result->code, $result->code, array('target' => '_blank'));
        }

        return $result->body;
    }
}