<?php

/**
 * This file is part of the Froxlor project.
 * Copyright (c) 2016 the Froxlor Team (see authors).
 *
 * For the full copyright and license information, please view the COPYING
 * file that was distributed with this source code. You can also view the
 * COPYING file online at http://files.froxlor.org/misc/COPYING.txt
 *
 * @copyright  (c) the authors
 * @author     Michael Kaufmann <mkaufmann@nutime.de>
 * @author     Froxlor team <team@froxlor.org> (2010-)
 * @license    GPLv2 http://files.froxlor.org/misc/COPYING.txt
 * @package    Frontend
 *
 * @since      0.9.35
 *
 */

define('AREA', 'admin');
require './lib/init.php';

// define update-uri
define('UPDATE_URI', "https://version.froxlor.org/Froxlor/legacy/" . $version);
define('RELEASE_URI', "https://autoupdate.froxlor.org/froxlor-{version}.zip");
define('CHECKSUM_URI', "https://autoupdate.froxlor.org/froxlor-{version}.zip.sha256");

// check for allow_url_fopen
if (ini_get('allow_url_fopen') === false) {
	redirectTo($filename, array('s' => $s, 'page' => 'error', 'errno' => 1));
}

// check for archive-stuff
if (function_exists('gzopen') === false) {
	redirectTo($filename, array('s' => $s, 'page' => 'error', 'errno' => 2));
}

// display initial version check
if ($page == 'overview') {

	// log our actions
	$log->logAction(ADM_ACTION, LOG_NOTICE, "checking auto-update");

	// check for new version
	$latestversion = @file(UPDATE_URI);

	if (isset($latestversion[0])) {
		$latestversion = explode('|', $latestversion[0]);

		if (is_array($latestversion)
				&& count($latestversion) >= 1
		) {
			$_version = $latestversion[0];
			$_message = isset($latestversion[1]) ? $latestversion[1] : '';
			$_link = isset($latestversion[2]) ? $latestversion[2] : htmlspecialchars($filename . '?s=' . urlencode($s) . '&page=' . urlencode($page) . '&lookfornewversion=yes');

			// add the branding so debian guys are not gettings confused
			// about their version-number
			$version_label = $_version.$branding;
			$version_link = $_link;
			$message_addinfo = $_message;

			// not numeric -> error-message
			if (!preg_match('/^((\d+\\.)(\d+\\.)(\d+\\.)?(\d+)?(\-(svn|dev|rc)(\d+))?)$/', $_version)) {
				// check for customized version to not output
				// "There is a newer version of froxlor" besides the error-message
				redirectTo($filename, array('s' => $s, 'page' => 'error', 'errno' => 3));
			} elseif (version_compare2($version, $_version) == -1) {
				// there is a newer version - yay
				$isnewerversion = 1;
			} else {
				// nothing new
				$isnewerversion = 0;
			}

			// anzeige über version-status mit ggfls. formular
			// zum update schritt #1 -> download
			if ($isnewerversion == 1) {
				$text = 'There is a newer version available. Update to version <b>'.$_version.'</b> now?<br/>(Your current version is: '.$version.')';
				$hiddenparams = '<input type="hidden" name="newversion" value="'.$_version.'" />';
				$yesfile = $filename.'?s='.$s.'&amp;page=getdownload';
				eval("echo \"" . getTemplate("misc/question_yesno", true) . "\";");
				exit;
			}
			elseif ($isnewerversion == 0) {
				// all good
			    standard_success ('noupdatesavail');
			} else {
				standard_error ('customized_version');
			}
		}
	}
	// error (something weird came from version.froxlor.org)
	redirectTo($filename, array('s' => $s, 'page' => 'error', 'errno' => 5));
}
// download the new archive
elseif ($page == 'getdownload') {

	// retrieve the new version from the form
	$newversion = isset($_POST['newversion']) ? $_POST['newversion'] : null;

	// valid?
	if ($newversion !== null) {

		// define files to get
		$toLoad = str_replace('{version}', $newversion, RELEASE_URI);
		$toCheck = str_replace('{version}', $newversion, CHECKSUM_URI);

		// get archive data
		$newArchive = @file_get_contents($toLoad);

		// check for local destination folder
		if (!is_dir(FROXLOR_INSTALL_DIR.'/updates/')) {
			mkdir(FROXLOR_INSTALL_DIR.'/updates/');
		}

		// name archive
		$localArchive = FROXLOR_INSTALL_DIR.'/updates/'.basename($toLoad);

		$log->logAction(ADM_ACTION, LOG_NOTICE, "Downloading ".$toLoad." to ".$localArchive);

		// remove old archive
		if (file_exists($localArchive)) {
		    @unlink($localArchive);
		}

		// store archive
		$fh = fopen($localArchive, 'w');
		if (!fwrite($fh, $newArchive)) {
			redirectTo($filename, array('s' => $s, 'page' => 'error', 'errno' => 4));
		}

		// close file-handle
		fclose($fh);

		// validate the integrity of the downloaded file
		$_shouldsum = @file_get_contents($toCheck);
		if (!empty($_shouldsum)) {
		    $_t = explode(" ", $_shouldsum);
		    $shouldsum = $_t[0];
		} else {
		    $shouldsum = null;
		}
		$filesum = hash_file('sha256', $localArchive);

		if ($filesum != $shouldsum) {
		    redirectTo($filename, array('s' => $s, 'page' => 'error', 'errno' => 9));
		}

		// to the next step
		redirectTo($filename, array('s' => $s, 'page' => 'extract', 'archive' => basename($localArchive)));
	}
	redirectTo($filename, array('s' => $s, 'page' => 'error', 'errno' => 6));
}
// extract and install new version
elseif ($page == 'extract') {

	$toExtract = isset($_GET['archive']) ? $_GET['archive'] : null;
	$localArchive = FROXLOR_INSTALL_DIR.'/updates/'.$toExtract;

	if (isset($_POST['send'])
			&& $_POST['send'] == 'send'
	) {
		// decompress from zip
		$zip = new ZipArchive;
		$res = $zip->open($localArchive);
		if ($res === true) {
		    $log->logAction(ADM_ACTION, LOG_NOTICE, "Extracting ".$localArchive." to ".dirname(FROXLOR_INSTALL_DIR));
			$zip->extractTo(dirname(FROXLOR_INSTALL_DIR));
			$zip->close();
			// success - remove unused archive
			@unlink($localArchive);
		} else {
			// error
			redirectTo($filename, array('s' => $s, 'page' => 'error', 'errno' => 8));
		}

		// redirect to update-page?
		redirectTo('admin_updates.php', array('s' => $s));
	}

	if (!file_exists($localArchive)) {
		redirectTo($filename, array('s' => $s, 'page' => 'error', 'errno' => 7));
	}

	$text = 'Extract downloaded archive "'.$toExtract.'"?';
	$hiddenparams = '';
	$yesfile = $filename.'?s='.$s.'&amp;page=extract&amp;archive='.$toExtract;
	eval("echo \"" . getTemplate("misc/question_yesno", true) . "\";");
}

// display error
elseif ($page == 'error') {

	// retrieve error-number via url-parameter
	$errno = isset($_GET['errno']) ? (int)$_GET['errno'] : 0;

	// 1 = no allow_url_fopen
	// 2 = no Zlib
	// 3 = custom version detected
	// 4 = could not store archive to local hdd
	// 5 = some weird value came from version.froxlor.org
	// 6 = download without valid version
	// 7 = local archive does not exist
	// 8 = could not extract archive
	// 9 = checksum mismatch
	standard_error ('autoupdate_'.$errno);
}