<?php
namespace Shaarli\Helper;
use Exception;
use malkusch\lock\exception\LockAcquireException;
use malkusch\lock\mutex\FlockMutex;
use Shaarli\Config\ConfigManager;
/**
* Shaarli (application) utilities
*/
class ApplicationUtils
{
/**
* @var string File containing the current version
*/
public static $VERSION_FILE = 'shaarli_version.php';
public static $GITHUB_URL = 'https://github.com/shaarli/Shaarli';
public static $GIT_RAW_URL = 'https://raw.githubusercontent.com/shaarli/Shaarli';
public static $GIT_BRANCHES = ['latest', 'stable'];
private static $VERSION_START_TAG = '<?php /* ';
private static $VERSION_END_TAG = ' */ ?>';
/**
* Gets the latest version code from the Git repository
*
* The code is read from the raw content of the version file on the Git server.
*
* @param string $url URL to reach to get the latest version.
* @param int $timeout Timeout to check the URL (in seconds).
*
* @return mixed the version code from the repository if available, else 'false'
*/
public static function getLatestGitVersionCode($url, $timeout = 2)
{
list($headers, $data) = get_http_response($url, $timeout);
if (preg_match('#HTTP/[\d\.]+ 200(?: OK)?#', $headers[0]) !== 1) {
error_log('Failed to retrieve ' . $url);
return false;
}
return $data;
}
/**
* Retrieve the version from a remote URL or a file.
*
* @param string $remote URL or file to fetch.
* @param int $timeout For URLs fetching.
*
* @return bool|string The version or false if it couldn't be retrieved.
*/
public static function getVersion($remote, $timeout = 2)
{
if (startsWith($remote, 'http')) {
if (($data = static::getLatestGitVersionCode($remote, $timeout)) === false) {
return false;
}
} else {
if (!is_file($remote)) {
return false;
}
$data = file_get_contents($remote);
}
return str_replace(
[self::$VERSION_START_TAG, self::$VERSION_END_TAG, PHP_EOL],
['', '', ''],
$data
);
}
/**
* Checks if a new Shaarli version has been published on the Git repository
*
* Updates checks are run periodically, according to the following criteria:
* - the update checks are enabled (install, global config);
* - the user is logged in (or this is an open instance);
* - the last check is older than a given interval;
* - the check is non-blocking if the HTTPS connection to Git fails;
* - in case of failure, the update file's modification date is updated,
* to avoid intempestive connection attempts.
*
* @param string $currentVersion the current version code
* @param string $updateFile the file where to store the latest version code
* @param int $checkInterval the minimum interval between update checks (in seconds
* @param bool $enableCheck whether to check for new versions
* @param bool $isLoggedIn whether the user is logged in
* @param string $branch check update for the given branch
*
* @throws Exception an invalid branch has been set for update checks
*
* @return mixed the new version code if available and greater, else 'false'
*/
public static function checkUpdate(
$currentVersion,
$updateFile,
$checkInterval,
$enableCheck,
$isLoggedIn,
$branch = 'stable'
) {
// Do not check versions for visitors
// Do not check if the user doesn't want to
// Do not check with dev version
if (!$isLoggedIn || empty($enableCheck) || $currentVersion === 'dev') {
return false;
}
if (is_file($updateFile) && (filemtime($updateFile) > time() - $checkInterval)) {
// Shaarli has checked for updates recently - skip HTTP query
$latestKnownVersion = file_get_contents($updateFile);
if (version_compare($latestKnownVersion, $currentVersion) == 1) {
return $latestKnownVersion;
}
return false;
}
if (!in_array($branch, self::$GIT_BRANCHES)) {
throw new Exception(
'Invalid branch selected for updates: "' . $branch . '"'
);
}
// Late Static Binding allows overriding within tests
// See http://php.net/manual/en/language.oop5.late-static-bindings.php
$latestVersion = static::getVersion(
self::$GIT_RAW_URL . '/' . $branch . '/' . self::$VERSION_FILE
);
if (!$latestVersion) {
// Only update the file's modification date
file_put_contents($updateFile, $currentVersion);
return false;
}
// Update the file's content and modification date
file_put_contents($updateFile, $latestVersion);
if (version_compare($latestVersion, $currentVersion) == 1) {
return $latestVersion;
}
return false;
}
/**
* Checks the PHP version to ensure Shaarli can run
*
* @param string $minVersion minimum PHP required version
* @param string $curVersion current PHP version (use PHP_VERSION)
*
* @return bool true on success
*
* @throws Exception the PHP version is not supported
*/
public static function checkPHPVersion($minVersion, $curVersion)
{
if (version_compare($curVersion, $minVersion) < 0) {
$msg = t(
'Your PHP version is obsolete!'
. ' Shaarli requires at least PHP %s, and thus cannot run.'
. ' Your PHP version has known security vulnerabilities and should be'
. ' updated as soon as possible.'
);
throw new Exception(sprintf($msg, $minVersion));
}
return true;
}
/**
* Checks Shaarli has the proper access permissions to its resources
*
* @param ConfigManager $conf Configuration Manager instance.
* @param bool $minimalMode In minimal mode we only check permissions to be able to display a template.
* Currently we only need to be able to read the theme and write in raintpl cache.
*
* @return array A list of the detected configuration issues
*/
public static function checkResourcePermissions(ConfigManager $conf, bool $minimalMode = false): array
{
$errors = [];
$rainTplDir = rtrim($conf->get('resource.raintpl_tpl'), '/');
// Check script and template directories are readable
foreach (
[
'application',
'inc',
'plugins',
$rainTplDir,
$rainTplDir . '/' . $conf->get('resource.theme'),
] as $path
) {
if (!is_readable(realpath($path))) {
$errors[] = '"' . $path . '" ' . t('directory is not readable');
}
}
// Check cache and data directories are readable and writable
if ($minimalMode) {
$folders = [
$conf->get('resource.raintpl_tmp'),
];
} else {
$folders = [
$conf->get('resource.thumbnails_cache'),
$conf->get('resource.data_dir'),
$conf->get('resource.page_cache'),
$conf->get('resource.raintpl_tmp'),
];
}
foreach ($folders as $path) {
if (!is_readable(realpath($path))) {
$errors[] = '"' . $path . '" ' . t('directory is not readable');
}
if (!is_writable(realpath($path))) {
$errors[] = '"' . $path . '" ' . t('directory is not writable');
}
}
if ($minimalMode) {
return $errors;
}
// Check configuration files are readable and writable
foreach (
[
$conf->getConfigFileExt(),
$conf->get('resource.datastore'),
$conf->get('resource.ban_file'),
$conf->get('resource.log'),
$conf->get('resource.update_check'),
] as $path
) {
if (!is_file(realpath($path))) {
# the file may not exist yet
continue;
}
if (!is_readable(realpath($path))) {
$errors[] = '"' . $path . '" ' . t('file is not readable');
}
if (!is_writable(realpath($path))) {
$errors[] = '"' . $path . '" ' . t('file is not writable');
}
}
return $errors;
}
public static function checkDatastoreMutex(): array
{
$mutex = new FlockMutex(fopen(SHAARLI_MUTEX_FILE, 'r'), 2);
try {
$mutex->synchronized(function () {
return true;
});
} catch (LockAcquireException $e) {
$errors[] = t('Lock can not be acquired on the datastore. You might encounter concurrent access issues.');
}
return $errors ?? [];
}
/**
* Returns a salted hash representing the current Shaarli version.
*
* Useful for assets browser cache.
*
* @param string $currentVersion of Shaarli
* @param string $salt User personal salt, also used for the authentication
*
* @return string version hash
*/
public static function getVersionHash($currentVersion, $salt)
{
return hash_hmac('sha256', $currentVersion, $salt);
}
/**
* Get a list of PHP extensions used by Shaarli.
*
* @return array[] List of extension with following keys:
* - name: extension name
* - required: whether the extension is required to use Shaarli
* - desc: short description of extension usage in Shaarli
* - loaded: whether the extension is properly loaded or not
*/
public static function getPhpExtensionsRequirement(): array
{
$extensions = [
['name' => 'json', 'required' => true, 'desc' => t('Configuration parsing')],
['name' => 'simplexml', 'required' => true, 'desc' => t('Slim Framework (routing, etc.)')],
['name' => 'mbstring', 'required' => true, 'desc' => t('Multibyte (Unicode) string support')],
['name' => 'gd', 'required' => false, 'desc' => t('Required to use thumbnails')],
['name' => 'intl', 'required' => false, 'desc' => t('Localized text sorting (e.g. e->è->f)')],
['name' => 'curl', 'required' => false, 'desc' => t('Better retrieval of bookmark metadata and thumbnail')],
['name' => 'gettext', 'required' => false, 'desc' => t('Use the translation system in gettext mode')],
['name' => 'ldap', 'required' => false, 'desc' => t('Login using LDAP server')],
];
foreach ($extensions as &$extension) {
$extension['loaded'] = extension_loaded($extension['name']);
}
return $extensions;
}
/**
* Return the EOL date of given PHP version. If the version is unknown,
* we return today + 2 years.
*
* @param string $fullVersion PHP version, e.g. 7.4.7
*
* @return string Date format: YYYY-MM-DD
*/
public static function getPhpEol(string $fullVersion): string
{
preg_match('/(\d+\.\d+)\.\d+/', $fullVersion, $matches);
return [
'7.1' => '2019-12-01',
'7.2' => '2020-11-30',
'7.3' => '2021-12-06',
'7.4' => '2022-11-28',
'8.0' => '2023-12-01',
][$matches[1]] ?? (new \DateTime('+2 year'))->format('Y-m-d');
}
}
