<?php
/**
 * NoNumber Framework Helper File: Functions
 *
 * @package         NoNumber Framework
 * @version         13.7.3
 *
 * @author          Peter van Westen <peter@nonumber.nl>
 * @link            http://www.nonumber.nl
 * @copyright       Copyright © 2012 NoNumber All Rights Reserved
 * @license         http://www.gnu.org/licenses/gpl-2.0.html GNU/GPL
 */

defined('_JEXEC') or die;

/**
 * Framework Functions
 */

class NNFrameworkFunctions
{
	var $_version = '13.7.3';

	public function getByUrl($url, $options = array())
	{
		// only allow url calls from administrator
		if (!JFactory::getApplication()->isAdmin()) {
			die;
		}

		// only allow when logged in
		$user = JFactory::getUser();
		if (!$user->id) {
			die;
		}

		if (substr($url, 0, 4) != 'http') {
			$url = 'http://' . $url;
		}

		// only allow url calls to nonumber.nl domain
		if (!(preg_match('#^https?://([^/]+\.)?nonumber\.nl/#', $url))) {
			die;
		}

		// only allow url calls to certain files
		if (
			strpos($url, 'download.nonumber.nl/extensions.php') === false
			&& strpos($url, 'www.nonumber.nl/ext/extension.php') === false
		) {
			die;
		}

		return self::getContents($url);
	}

	public function getContents($url)
	{
		$html = '';
		if (function_exists('curl_init') && function_exists('curl_exec')) {
			$html = $this->curl($url);
		} else {
			$file = @fopen($url, 'r');
			if ($file) {
				$html = array();
				while (!feof($file)) {
					$html[] = fgets($file, 1024);
				}
				$html = implode('', $html);
			}
		}

		return $html;
	}

	protected function curl($url)
	{
		$timeout = JFactory::getApplication()->input->getInt('timeout', 3);
		$timeout = min(array(30, max(array(3, $timeout))));

		$ch = curl_init($url);

		curl_setopt($ch, CURLOPT_URL, $url);
		curl_setopt($ch, CURLOPT_HEADER, false);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
		curl_setopt($ch, CURLOPT_USERAGENT, 'NoNumber/' . $this->_version);
		curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);

		$config = JComponentHelper::getParams('com_nonumbermanager');
		if ($config && $config->get('use_proxy', 0) && $config->get('proxy_host')) {
			curl_setopt($ch, CURLOPT_PROXY, $config->get('proxy_host') . ':' . $config->get('proxy_port'));
			curl_setopt($ch, CURLOPT_PROXYUSERPWD, $config->get('proxy_login') . ':' . $config->get('proxy_password'));
			curl_setopt($ch, CURLOPT_TIMEOUT, 30);
		}

		//follow on location problems
		if (ini_get('open_basedir') == '' && ini_get('safe_mode') != '1' && ini_get('safe_mode') != 'On') {
			curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
			$html = curl_exec($ch);
		} else {
			$html = $this->curl_redir_exec($ch);
		}
		curl_close($ch);
		return $html;
	}

	protected function curl_redir_exec($ch)
	{
		static $curl_loops = 0;
		static $curl_max_loops = 20;

		if ($curl_loops++ >= $curl_max_loops) {
			$curl_loops = 0;
			return false;
		}

		curl_setopt($ch, CURLOPT_HEADER, true);
		$data = curl_exec($ch);

		list($header, $data) = explode("\n\n", str_replace("\r", '', $data), 2);
		$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);

		if ($http_code == 301 || $http_code == 302) {
			$matches = array();
			preg_match('/Location:(.*?)\n/', $header, $matches);
			$url = @parse_url(trim(array_pop($matches)));
			if (!$url) {
				//couldn't process the url to redirect to
				$curl_loops = 0;
				return $data;
			}
			$last_url = parse_url(curl_getinfo($ch, CURLINFO_EFFECTIVE_URL));
			if (!$url['scheme']) {
				$url['scheme'] = $last_url['scheme'];
			}
			if (!$url['host']) {
				$url['host'] = $last_url['host'];
			}
			if (!$url['path']) {
				$url['path'] = $last_url['path'];
			}
			$new_url = $url['scheme'] . '://' . $url['host'] . $url['path'] . ($url['query'] ? '?' . $url['query'] : '');
			curl_setopt($ch, CURLOPT_URL, $new_url);
			return $this->curl_redir_exec($ch);
		} else {
			$curl_loops = 0;
			return $data;
		}
	}

	static function extensionInstalled($extension, $type = 'component', $folder = 'system')
	{
		switch ($type) {
			case 'component':
				if (JFile::exists(JPATH_ADMINISTRATOR . '/components/com_' . $extension . '/' . $extension . '.php')
					|| JFile::exists(JPATH_ADMINISTRATOR . '/components/com_' . $extension . '/admin.' . $extension . '.php')
					|| JFile::exists(JPATH_SITE . '/components/com_' . $extension . '/' . $extension . '.php')
				) {
					return 1;
				}
				break;
			case 'plugin':
				if (JFile::exists(JPATH_PLUGINS . '/' . $folder . '/' . $extension . '/' . $extension . '.php')) {
					return 1;
				}
				break;
			case 'module':
				if (JFile::exists(JPATH_ADMINISTRATOR . '/modules/mod_' . $extension . '/' . $extension . '.php')
					|| JFile::exists(JPATH_ADMINISTRATOR . '/modules/mod_' . $extension . '/mod_' . $extension . '.php')
					|| JFile::exists(JPATH_SITE . '/modules/mod_' . $extension . '/' . $extension . '.php')
					|| JFile::exists(JPATH_SITE . '/modules/mod_' . $extension . '/mod_' . $extension . '.php')
				) {
					return 1;
				}
				break;
		}
		return 0;
	}
}
