add update cli-command; add update-channel setting (stable|testing)

Signed-off-by: Michael Kaufmann <d00p@froxlor.org>

lib/Froxlor/Install/AutoUpdate.php

@@ -0,0 +1,173 @@
+<?php
+
+/**
+ * This file is part of the Froxlor project.
+ * Copyright (c) 2010 the Froxlor Team (see authors).
+ *
+ * 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 2
+ * 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, you can also view it online at
+ * https://files.froxlor.org/misc/COPYING.txt
+ *
+ * @copyright  the authors
+ * @author     Froxlor team <team@froxlor.org>
+ * @license    https://files.froxlor.org/misc/COPYING.txt GPLv2
+ */
+
+namespace Froxlor\Install;
+
+use Exception;
+use Froxlor\Froxlor;
+use Froxlor\Settings;
+use Froxlor\Http\HttpClient;
+
+class AutoUpdate
+{
+	// define update-uri
+	const UPDATE_URI = "https://version.froxlor.org/froxlor/api2/";
+	const RELEASE_URI = "https://autoupdate.froxlor.org/froxlor-{version}.zip";
+	const CHECKSUM_URI = "https://autoupdate.froxlor.org/froxlor-{version}.zip.sha256";
+
+	const ERR_NOZIPEXT = 2;
+	const ERR_COULDNOTSTORE = 4;
+	const ERR_ZIPNOTFOUND = 7;
+	const ERR_COULDNOTEXTRACT = 8;
+	const ERR_CHKSUM_MISMATCH = 9;
+	const ERR_MINPHP = 10;
+
+	private static $latestversion = "";
+
+	private static $lasterror = "";
+
+	/**
+	 * returns status about whether there is a newer version
+	 * 
+	 * 0 = no new version available
+	 * 1 = new version available
+	 * -1 = remote error message
+	 * >1 = local error message
+	 *
+	 * @return int 
+	 */
+	public static function checkVersion(): int
+	{
+		$result = self::checkPrerequisites();
+
+		if ($result == 0) {
+			try {
+				$channel = '';
+				if (Settings::Get('system.update_channel') == 'testing') {
+					$channel = '/testing';
+				}
+				$latestversion = HttpClient::urlGet(self::UPDATE_URI . Froxlor::VERSION . $channel, true, 3);
+			} catch (Exception $e) {
+				throw new Exception("Version-check currently unavailable, please try again later", 504);
+			}
+
+			self::$latestversion = json_decode($latestversion, true);
+
+			if (self::$latestversion) {
+				if (!empty(self::$latestversion['error']) && self::$latestversion['error']) {
+					$result = -1;
+					self::$lasterror = self::$latestversion['message'];
+				} else if (isset(self::$latestversion['has_latest']) && self::$latestversion['has_latest'] == false) {
+					$result = 1;
+				}
+			}
+		}
+		return $result;
+	}
+
+	public static function downloadZip(string $newversion)
+	{
+		// define files to get
+		$toLoad = str_replace('{version}', $newversion, self::RELEASE_URI);
+		$toCheck = str_replace('{version}', $newversion, self::CHECKSUM_URI);
+
+		// check for local destination folder
+		if (!is_dir(Froxlor::getInstallDir() . '/updates/')) {
+			mkdir(Froxlor::getInstallDir() . '/updates/');
+		}
+
+		// name archive
+		$localArchive = Froxlor::getInstallDir() . '/updates/' . basename($toLoad);
+
+		// remove old archive
+		if (file_exists($localArchive)) {
+			@unlink($localArchive);
+		}
+
+		// get archive data
+		try {
+			HttpClient::fileGet($toLoad, $localArchive);
+		} catch (Exception $e) {
+			return self::ERR_COULDNOTSTORE;
+		}
+
+		// validate the integrity of the downloaded file
+		$_shouldsum = HttpClient::urlGet($toCheck);
+		if (!empty($_shouldsum)) {
+			$_t = explode(" ", $_shouldsum);
+			$shouldsum = $_t[0];
+		} else {
+			$shouldsum = null;
+		}
+		$filesum = hash_file('sha256', $localArchive);
+
+		if ($filesum != $shouldsum) {
+			return self::ERR_CHKSUM_MISMATCH;
+		}
+
+		return basename($localArchive);
+	}
+
+	public static function extractZip(string $localArchive): int
+	{
+		if (!file_exists($localArchive)) {
+			return self::ERR_ZIPNOTFOUND;
+		}
+		// decompress from zip
+		$zip = new ZipArchive();
+		$res = $zip->open($localArchive);
+		if ($res === true) {
+			$zip->extractTo(Froxlor::getInstallDir());
+			$zip->close();
+			// success - remove unused archive
+			@unlink($localArchive);
+			// wait a bit before we redirect to be sure
+			sleep(3);
+			return 0;
+		}
+		return self::ERR_COULDNOTEXTRACT;
+	}
+
+	private static function checkPrerequisites(): int
+	{
+		if (!extension_loaded('zip')) {
+			return self::ERR_NOZIPEXT;
+		}
+		if (version_compare("7.4.0", PHP_VERSION, ">=")) {
+			return self::ERR_MINPHP;
+		}
+		return 0;
+	}
+
+	public static function getLastError(): string
+	{
+		return self::$lasterror ?? "";
+	}
+
+	public static function getFromResult(string $index)
+	{
+		return self::$latestversion[$index] ?? "";
+	}
+}