class FileReadOnlyStorage

class FileReadOnlyStorage implements PhpStorageInterface {
    
    /**
     * The directory where the files should be stored.
     *
     * @var string
     */
    protected $directory;
    
    /**
     * Constructs this FileStorage object.
     *
     * @param $configuration
     *   An associative array, containing at least two keys (the rest are ignored):
     *   - directory: The directory where the files should be stored.
     *   - bin: The storage bin. Multiple storage objects can be instantiated with
     *   the same configuration, but for different bins.
     */
    public function __construct(array $configuration) {
        $this->directory = $configuration['directory'] . '/' . $configuration['bin'];
    }
    
    /**
     * {@inheritdoc}
     */
    public function exists($name) {
        return file_exists($this->getFullPath($name));
    }
    
    /**
     * {@inheritdoc}
     */
    public function load($name) {
        // The FALSE returned on failure is enough for the caller to handle this,
        // we do not want a warning too.
        return @(include_once $this->getFullPath($name)) !== FALSE;
    }
    
    /**
     * {@inheritdoc}
     */
    public function save($name, $code) {
        return FALSE;
    }
    
    /**
     * {@inheritdoc}
     */
    public function delete($name) {
        return FALSE;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFullPath($name) {
        return $this->directory . '/' . $name;
    }
    
    /**
     * {@inheritdoc}
     */
    public function writeable() {
        @trigger_error(__METHOD__ . '() is deprecated in drupal:10.1.0 and will be removed from drupal:11.0.0. There is no replacement. See https://www.drupal.org/node/3155413', E_USER_DEPRECATED);
        return FALSE;
    }
    
    /**
     * {@inheritdoc}
     */
    public function deleteAll() {
        return FALSE;
    }
    
    /**
     * {@inheritdoc}
     */
    public function listAll() {
        $names = [];
        if (file_exists($this->directory)) {
            foreach (new \DirectoryIterator($this->directory) as $fileinfo) {
                if (!$fileinfo->isDot()) {
                    $name = $fileinfo->getFilename();
                    if ($name != '.htaccess') {
                        $names[] = $name;
                    }
                }
            }
        }
        return $names;
    }
    
    /**
     * {@inheritdoc}
     */
    public function garbageCollection() {
    }

}