bfe4f536bb
The hash is generated using the same salt as the one used for credentials (1 salt per instance) in order to avoid exposing the instance version. Fixes #965
239 lines
8.2 KiB
PHP
239 lines
8.2 KiB
PHP
<?php
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/**
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* Shaarli (application) utilities
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*/
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class ApplicationUtils
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{
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/**
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* @var string File containing the current version
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*/
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public static $VERSION_FILE = 'shaarli_version.php';
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private static $GIT_URL = 'https://raw.githubusercontent.com/shaarli/Shaarli';
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private static $GIT_BRANCHES = array('latest', 'stable');
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private static $VERSION_START_TAG = '<?php /* ';
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private static $VERSION_END_TAG = ' */ ?>';
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/**
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* Gets the latest version code from the Git repository
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*
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* The code is read from the raw content of the version file on the Git server.
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*
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* @param string $url URL to reach to get the latest version.
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* @param int $timeout Timeout to check the URL (in seconds).
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*
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* @return mixed the version code from the repository if available, else 'false'
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*/
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public static function getLatestGitVersionCode($url, $timeout=2)
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{
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list($headers, $data) = get_http_response($url, $timeout);
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if (strpos($headers[0], '200 OK') === false) {
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error_log('Failed to retrieve ' . $url);
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return false;
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}
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return $data;
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}
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/**
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* Retrieve the version from a remote URL or a file.
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*
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* @param string $remote URL or file to fetch.
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* @param int $timeout For URLs fetching.
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*
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* @return bool|string The version or false if it couldn't be retrieved.
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*/
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public static function getVersion($remote, $timeout = 2)
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{
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if (startsWith($remote, 'http')) {
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if (($data = static::getLatestGitVersionCode($remote, $timeout)) === false) {
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return false;
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}
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} else {
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if (! is_file($remote)) {
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return false;
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}
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$data = file_get_contents($remote);
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}
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return str_replace(
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array(self::$VERSION_START_TAG, self::$VERSION_END_TAG, PHP_EOL),
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array('', '', ''),
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$data
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);
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}
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/**
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* Checks if a new Shaarli version has been published on the Git repository
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*
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* Updates checks are run periodically, according to the following criteria:
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* - the update checks are enabled (install, global config);
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* - the user is logged in (or this is an open instance);
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* - the last check is older than a given interval;
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* - the check is non-blocking if the HTTPS connection to Git fails;
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* - in case of failure, the update file's modification date is updated,
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* to avoid intempestive connection attempts.
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*
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* @param string $currentVersion the current version code
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* @param string $updateFile the file where to store the latest version code
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* @param int $checkInterval the minimum interval between update checks (in seconds
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* @param bool $enableCheck whether to check for new versions
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* @param bool $isLoggedIn whether the user is logged in
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* @param string $branch check update for the given branch
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*
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* @throws Exception an invalid branch has been set for update checks
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*
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* @return mixed the new version code if available and greater, else 'false'
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*/
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public static function checkUpdate($currentVersion,
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$updateFile,
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$checkInterval,
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$enableCheck,
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$isLoggedIn,
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$branch='stable')
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{
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// Do not check versions for visitors
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// Do not check if the user doesn't want to
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// Do not check with dev version
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if (! $isLoggedIn || empty($enableCheck) || $currentVersion === 'dev') {
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return false;
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}
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if (is_file($updateFile) && (filemtime($updateFile) > time() - $checkInterval)) {
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// Shaarli has checked for updates recently - skip HTTP query
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$latestKnownVersion = file_get_contents($updateFile);
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if (version_compare($latestKnownVersion, $currentVersion) == 1) {
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return $latestKnownVersion;
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}
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return false;
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}
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if (! in_array($branch, self::$GIT_BRANCHES)) {
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throw new Exception(
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'Invalid branch selected for updates: "' . $branch . '"'
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);
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}
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// Late Static Binding allows overriding within tests
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// See http://php.net/manual/en/language.oop5.late-static-bindings.php
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$latestVersion = static::getVersion(
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self::$GIT_URL . '/' . $branch . '/' . self::$VERSION_FILE
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);
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if (! $latestVersion) {
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// Only update the file's modification date
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file_put_contents($updateFile, $currentVersion);
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return false;
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}
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// Update the file's content and modification date
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file_put_contents($updateFile, $latestVersion);
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if (version_compare($latestVersion, $currentVersion) == 1) {
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return $latestVersion;
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}
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return false;
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}
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/**
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* Checks the PHP version to ensure Shaarli can run
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*
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* @param string $minVersion minimum PHP required version
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* @param string $curVersion current PHP version (use PHP_VERSION)
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*
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* @throws Exception the PHP version is not supported
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*/
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public static function checkPHPVersion($minVersion, $curVersion)
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{
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if (version_compare($curVersion, $minVersion) < 0) {
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throw new Exception(
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'Your PHP version is obsolete!'
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.' Shaarli requires at least PHP '.$minVersion.', and thus cannot run.'
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.' Your PHP version has known security vulnerabilities and should be'
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.' updated as soon as possible.'
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);
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}
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}
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/**
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* Checks Shaarli has the proper access permissions to its resources
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*
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* @param ConfigManager $conf Configuration Manager instance.
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*
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* @return array A list of the detected configuration issues
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*/
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public static function checkResourcePermissions($conf)
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{
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$errors = array();
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// Check script and template directories are readable
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foreach (array(
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'application',
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'inc',
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'plugins',
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$conf->get('resource.raintpl_tpl'),
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$conf->get('resource.raintpl_tpl').'/'.$conf->get('resource.theme'),
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) as $path) {
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if (! is_readable(realpath($path))) {
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$errors[] = '"'.$path.'" directory is not readable';
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}
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}
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// Check cache and data directories are readable and writable
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foreach (array(
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$conf->get('resource.thumbnails_cache'),
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$conf->get('resource.data_dir'),
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$conf->get('resource.page_cache'),
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$conf->get('resource.raintpl_tmp'),
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) as $path) {
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if (! is_readable(realpath($path))) {
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$errors[] = '"'.$path.'" directory is not readable';
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}
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if (! is_writable(realpath($path))) {
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$errors[] = '"'.$path.'" directory is not writable';
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}
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}
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// Check configuration files are readable and writable
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foreach (array(
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$conf->getConfigFileExt(),
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$conf->get('resource.datastore'),
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$conf->get('resource.ban_file'),
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$conf->get('resource.log'),
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$conf->get('resource.update_check'),
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) as $path) {
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if (! is_file(realpath($path))) {
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# the file may not exist yet
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continue;
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}
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if (! is_readable(realpath($path))) {
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$errors[] = '"'.$path.'" file is not readable';
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}
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if (! is_writable(realpath($path))) {
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$errors[] = '"'.$path.'" file is not writable';
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}
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}
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return $errors;
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}
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/**
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* Returns a salted hash representing the current Shaarli version.
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*
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* Useful for assets browser cache.
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*
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* @param string $currentVersion of Shaarli
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* @param string $salt User personal salt, also used for the authentication
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*
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* @return string version hash
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*/
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public static function getVersionHash($currentVersion, $salt)
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{
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return hash_hmac('sha256', $currentVersion, $salt);
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}
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}
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