<?php
/**
 *  @package AkeebaBackup
 *  @copyright Copyright (c)2010-2016 Nicholas K. Dionysopoulos
 *  @license GNU General Public License version 3, or later
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *  --
 *
 *  Command-line script to schedule the File Alteration Monitor check
 */

// Define ourselves as a parent file
define('_JEXEC', 1);

// Setup and import the base CLI script
$minphp = '5.4.0';
$curdir = __DIR__;

require_once __DIR__ . '/../administrator/components/com_akeeba/Master/Cli/Base.php';

// Enable Akeeba Engine
define('AKEEBAENGINE', 1);

use Akeeba\Engine\Platform;

/**
 * Akeeba Backup alternative check failed application
 */
class AkeebaBackupAltCheckfailed extends AkeebaCliBase
{
	public function execute()
	{
		$version		 = AKEEBA_VERSION;
		$date			 = AKEEBA_DATE;

		if ($this->input->get('quiet', -1, 'int') == -1)
		{
			$year = gmdate('Y');
			echo <<<ENDBLOCK
Akeeba Backup Alternate CRON Helper Script check for failures version $version ($date)
Copyright (c) 2006-$year Akeeba Ltd / Nicholas K. Dionysopoulos
-------------------------------------------------------------------------------
Akeeba Backup is Free Software, distributed under the terms of the GNU General
Public License version 3 or, at your option, any later version.
This program comes with ABSOLUTELY NO WARRANTY as per sections 15 & 16 of the
license. See http://www.gnu.org/licenses/gpl-3.0.html for details.
-------------------------------------------------------------------------------

ENDBLOCK;
		}

		// Log some paths
		if ($this->input->get('quiet', -1, 'int') == -1)
		{
			echo "Site paths determined by this script:\n";
			echo "JPATH_BASE : " . JPATH_BASE . "\n";
			echo "JPATH_ADMINISTRATOR : " . JPATH_ADMINISTRATOR . "\n\n";
		}

		// Load the engine
		$factoryPath = JPATH_ADMINISTRATOR . '/components/com_akeeba/BackupEngine/Factory.php';
		define('JPATH_COMPONENT_ADMINISTRATOR', JPATH_ADMINISTRATOR . '/components/com_akeeba');
		if (!file_exists($factoryPath))
		{
			echo "ERROR!\n";
			echo "Could not load the backup engine; file does not exist. Technical information:\n";
			echo "Path to " . basename(__FILE__) . ": " . __DIR__ . "\n";
			echo "Path to factory file: $factoryPath\n";
			die("\n");
		}
		else
		{
			try
			{
				require_once $factoryPath;
			}
			catch (Exception $e)
			{
				echo "ERROR!\n";
				echo "Backup engine returned an error. Technical information:\n";
				echo "Error message:\n\n";
				echo $e->getMessage() . "\n\n";
				echo "Path to " . basename(__FILE__) . ":" . __DIR__ . "\n";
				echo "Path to factory file: $factoryPath\n";
				die("\n");
			}
		}

		$startup_check = true;

		// Assign the correct platform
		Platform::addPlatform('joomla3x', JPATH_COMPONENT_ADMINISTRATOR . '/BackupPlatform/Joomla3x');

		// Get the live site's URL
		$url = Platform::getInstance()->get_platform_configuration_option('siteurl', '');
		if (empty($url))
		{
			echo <<<ENDTEXT
ERROR:
	This script could not detect your live site's URL. Please visit Akeeba
	Backup's Control Panel page at least once before running this script, so
	that this information can be stored for use by this script.

ENDTEXT;
			$startup_check = false;
		}

		// Get the front-end backup settings
		$frontend_enabled	 = Platform::getInstance()->get_platform_configuration_option('failure_frontend_enable', '');
		$secret				 = Platform::getInstance()->get_platform_configuration_option('frontend_secret_word', '');

		if (!$frontend_enabled)
		{
			echo <<<ENDTEXT
ERROR:
	Your Akeeba Backup installation's front-end check for failures feature
	is currently disabled. Please log in to your site's back-end as a Super
	Administrator, go to Akeeba Backup's Control Panel, click on the Options
	icon in	the top right corner and enable the front-end backup feature. Do not
	forget to also set a Secret Word!

ENDTEXT;
			$startup_check = false;
		}
		elseif (empty($secret))
		{
			echo <<<ENDTEXT
ERROR:
	You have enabled the front-end check for failure feature, but you forgot
	to set a secret word. Without a valid secret word this script can not continue.
	Please log in to your site's back-end as a Super Administrator, go to
	Akeeba Backup's Control Panel, click on the Options icon in the top
	right corner set a Secret Word.

ENDTEXT;
			$startup_check = false;
		}

		// Detect cURL or fopen URL
		$method = null;
		if (function_exists('curl_init'))
		{
			$method = 'curl';
		}
		elseif (function_exists('fsockopen'))
		{
			$method = 'fsockopen';
		}

		if (empty($method))
		{
			if (function_exists('ini_get'))
			{
				if (ini_get('allow_url_fopen'))
				{
					$method = 'fopen';
				}
			}
		}

		$overridemethod = $this->input->get('method', '', 'cmd');
		if (!empty($overridemethod))
		{
			$method = $overridemethod;
		}

		if (empty($method))
		{
			echo <<<ENDTEXT
ERROR:
	Could not find any supported method for running the front-end backup
	feature of Akeeba Backup. Please check with your host that at least
	one of the following features are supported in your PHP configuration:
	1. The cURL extension
	2. The fsockopen() function
	3. The fopen() URL wrappers, i.e. allow_url_fopen is enabled
	If neither method is available you will not be able to backup your
	site using this CRON helper script.

ENDTEXT;
			$startup_check = false;
		}

		if (!$startup_check)
		{
			echo "\n\nBACKUP FAILURE CHECK ABORTED DUE TO CONFIGURATION ERRORS\n\n";
			$this->close(255);
		}

		// Perform the backup
		$url	 = rtrim($url, '/');
		$secret	 = urlencode($secret);
		$url .= "/index.php?option=com_akeeba&view=check&key={$secret}";


        $timestamp	 = date('Y-m-d H:i:s');

        $result = $this->fetchURL($url, $method);

        if (empty($result) || ($result === false))
        {
            echo "[{$timestamp}] No message received\n";
            echo <<<ENDTEXT
ERROR:
    Your check for failures attempt has timed out, or a fatal PHP error has occurred.

ENDTEXT;
        }
        elseif (strpos($result, '200 ') !== false)
        {
            echo "[{$timestamp}] Checks finalization message received\n";
            echo <<<ENDTEXT

Checks are finished successfully.

ENDTEXT;
        }
        elseif (strpos($result, '500 ') !== false)
        {
            // Backup error
            echo "[{$timestamp}] Error signal received\n";
            echo <<<ENDTEXT
ERROR:
An error has occurred. The server's response was:

$result

Backup failed.

ENDTEXT;
        }
        elseif (strpos($result, '403 ') !== false)
        {
            // This should never happen: invalid authentication or front-end backup disabled
            echo "[{$timestamp}] Connection denied (403) message received\n";
            echo <<<ENDTEXT
ERROR:
The server denied the connection. Please make sure that the front-end
backup feature is enabled and a valid secret word is in place.

Server response: $result

Backup failed.

ENDTEXT;
        }
        else
        {
            // Unknown result?!
            echo "[{$timestamp}] Could not parse the server response.\n";
            echo <<<ENDTEXT
ERROR:
We could not understand the server's response. Most likely an error
has occurred. The server's response was:

$result

If you do not see "200 OK" at the end of this output, checks failed.

ENDTEXT;
        }
    }

	/**
	 * Fetches a remote URL using curl, fsockopen or fopen
	 *
	 * @param  string	$url		The remote URL to fetch
	 * @param  string	$method		The method to use: curl, fsockopen or fopen (optional)
	 * @return string The contents of the URL which was fetched
	 */
	private function fetchURL($url, $method = 'curl')
	{
		switch ($method)
		{
			case 'curl':
				$ch			 = curl_init($url);
				$cacertPath	 = JPATH_ADMINISTRATOR . '/components/com_akeeba/akeeba/Engine/cacert.pem';
				if (file_exists($cacertPath))
				{
					@curl_setopt($ch, CURLOPT_CAINFO, $cacertPath);
				}
				@curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
				@curl_setopt($ch, CURLOPT_FRESH_CONNECT, true);
				@curl_setopt($ch, CURLOPT_HEADER, false);
				@curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
				@curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
				@curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 180);
				@curl_setopt($ch, CURLOPT_TIMEOUT, 180);
				$result = curl_exec($ch);
				curl_close($ch);
				return $result;
				break;

			case 'fsockopen':
				$pos		 = strpos($url, '://');
				$protocol	 = strtolower(substr($url, 0, $pos));
				$req		 = substr($url, $pos + 3);
				$pos		 = strpos($req, '/');
				if ($pos === false)
					$pos		 = strlen($req);
				$host		 = substr($req, 0, $pos);

				if (strpos($host, ':') !== false)
				{
					list($host, $port) = explode(':', $host);
				}
				else
				{
					$host	 = $host;
					$port	 = ($protocol == 'https') ? 443 : 80;
				}

				$uri = substr($req, $pos);
				if ($uri == '')
					$uri = '/';

				$crlf	 = "\r\n";
				$req	 = 'GET ' . $uri . ' HTTP/1.0' . $crlf
					. 'Host: ' . $host . $crlf
					. $crlf;

				$fp			 = fsockopen(($protocol == 'https' ? 'ssl://' : '') . $host, $port);
				fwrite($fp, $req);
				$response	 = '';
				while (is_resource($fp) && $fp && !feof($fp))
					$response .= fread($fp, 1024);
				fclose($fp);

				// split header and body
				$pos	 = strpos($response, $crlf . $crlf);
				if ($pos === false)
					return($response);
				$header	 = substr($response, 0, $pos);
				$body	 = substr($response, $pos + 2 * strlen($crlf));

				// parse headers
				$headers											 = array();
				$lines												 = explode($crlf, $header);
				foreach ($lines as $line)
					if (($pos												 = strpos($line, ':')) !== false)
						$headers[strtolower(trim(substr($line, 0, $pos)))]	 = trim(substr($line, $pos + 1));

				//redirection?
				if (isset($headers['location']))
				{
					return $this->fetchURL($headers['location'], $method);
				}
				else
				{
					return($body);
				}

				break;

			case 'fopen':
				$opts = array(
					'http' => array(
						'method' => "GET",
						'header' => "Accept-language: en\r\n"
					)
				);

				$context = stream_context_create($opts);
				$result	 = @file_get_contents($url, false, $context);
				break;
		}

		return $result;
	}

}

// Load the version file
require_once JPATH_ADMINISTRATOR . '/components/com_akeeba/version.php';

// Instanciate and run the application
AkeebaCliBase::getInstance('AkeebaBackupAltCheckfailed')->execute();