class FileStorage

1. 9.x drupal/core/lib/Drupal/Component/PhpStorage/FileStorage.php \Drupal\Component\PhpStorage\FileStorage
2. 9.x drupal/core/lib/Drupal/Core/Config/FileStorage.php \Drupal\Core\Config\FileStorage

class FileStorage 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 these two keys:
   *   - 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'];
  }

  /**
   * Implements Drupal\Component\PhpStorage\PhpStorageInterface::exists().
   */
  public function exists($name) {
    return file_exists($this
      ->getFullPath($name));
  }

  /**
   * Implements Drupal\Component\PhpStorage\PhpStorageInterface::load().
   */
  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;
  }

  /**
   * Implements Drupal\Component\PhpStorage\PhpStorageInterface::save().
   */
  public function save($name, $code) {
    $path = $this
      ->getFullPath($name);
    mkdir(dirname($path), 0700, TRUE);
    return (bool) file_put_contents($path, $code);
  }

  /**
   * Implements Drupal\Component\PhpStorage\PhpStorageInterface::delete().
   */
  public function delete($name) {
    $path = $this
      ->getFullPath($name);
    return @unlink($path);
  }

  /**
   * Returns the full path where the file is or should be stored.
   */
  protected function getFullPath($name) {
    return $this->directory . '/' . $name;
  }

  /**
   * Implements Drupal\Component\PhpStorage\PhpStorageInterface::writeable().
   */
  function writeable() {
    return TRUE;
  }

  /**
   * Implements Drupal\Component\PhpStorage\PhpStorageInterface::deleteAll().
   */
  function deleteAll() {

    // @todo remove this to properly decouple this class from Drupal.
    if (!function_exists('file_unmanaged_delete_recursive')) {
      include_once DRUPAL_ROOT . '/core/includes/file.inc';
    }
    return file_unmanaged_delete_recursive($this->directory, array(
      __CLASS__,
      'filePreDeleteCallback',
    ));
  }

  /**
   * Ensures files and directories are deletable.
   */
  public static function filePreDeleteCallback($path) {
    if (file_exists($path)) {
      chmod($path, 0700);
    }
  }

}