<?php
/**
* Shaarli (application) utilities
*/
class ApplicationUtils
{
/**
* @var string File containing the current version
*/
public static $VERSION_FILE = 'shaarli_version.php';
private static $GIT_URL = 'https://raw.githubusercontent.com/shaarli/Shaarli';
private static $GIT_BRANCHES = array('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, $timeout);
if (strpos($headers[0], '200 OK') === false) {
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(
array(self::$VERSION_START_TAG, self::$VERSION_END_TAG, PHP_EOL),
array('', '', ''),
$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_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 $curVersion current PHP version (use PHP_VERSION)
*
* @throws Exception the PHP version is not supported
*/
public static function checkPHPVersion($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));
}
}
/**
* Checks Shaarli has the proper access permissions to its resources
*
* @param ConfigManager $conf Configuration Manager instance.
*
* @return array A list of the detected configuration issues
*/
public static function checkResourcePermissions($conf)
{
$errors = array();
$rainTplDir = rtrim($conf->get('resource.raintpl_tpl'), '/');
// Check script and template directories are readable
foreach (array(
'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
foreach (array(
$conf->get('resource.thumbnails_cache'),
$conf->get('resource.data_dir'),
$conf->get('resource.page_cache'),
$conf->get('resource.raintpl_tmp'),
) 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');
}
}
// Check configuration files are readable and writable
foreach (array(
$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;
}
/**
* 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);
}
}
