class FileEntityNormalizer

class FileEntityNormalizer extends ContentEntityNormalizer {
    
    /**
     * {@inheritdoc}
     */
    protected $supportedInterfaceOrClass = FileInterface::class;
    
    /**
     * The HTTP client.
     *
     * @var \GuzzleHttp\ClientInterface
     */
    protected $httpClient;
    
    /**
     * The HAL settings config.
     *
     * @var \Drupal\Core\Config\ImmutableConfig
     */
    protected $halSettings;
    
    /**
     * Constructs a FileEntityNormalizer object.
     *
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
     *   The entity type manager service.
     * @param \Drupal\hal\LinkManager\LinkManagerInterface $link_manager
     *   The hypermedia link manager.
     * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
     *   The module handler.
     * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
     *   The config factory.
     * @param \Drupal\Core\Entity\EntityTypeRepositoryInterface $entity_type_repository
     *   The entity type repository.
     * @param \Drupal\Core\Entity\EntityFieldManagerInterface $entity_field_manager
     *   The entity field manager.
     */
    public function __construct(EntityTypeManagerInterface $entity_type_manager, LinkManagerInterface $link_manager, ModuleHandlerInterface $module_handler, ConfigFactoryInterface $config_factory, EntityTypeRepositoryInterface $entity_type_repository = NULL, EntityFieldManagerInterface $entity_field_manager = NULL) {
        parent::__construct($link_manager, $entity_type_manager, $module_handler, $entity_type_repository, $entity_field_manager);
        $this->halSettings = $config_factory->get('hal.settings');
    }
    
    /**
     * {@inheritdoc}
     *
     * @deprecated in drupal:8.5.0 and is removed from drupal:9.0.0.
     */
    public function normalize($entity, $format = NULL, array $context = []) {
        $data = parent::normalize($entity, $format, $context);
        $this->addCacheableDependency($context, $this->halSettings);
        if ($this->halSettings
            ->get('bc_file_uri_as_url_normalizer')) {
            // Replace the file url with a full url for the file.
            $data['uri'][0]['value'] = $this->getEntityUri($entity);
            @trigger_error("Replacing the file uri with the URL is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. Use the provided url property instead and disable hal.settings:bc_file_uri_as_url_normalizer. See https://www.drupal.org/node/2925783", E_USER_DEPRECATED);
        }
        return $data;
    }
    
    /**
     * {@inheritdoc}
     */
    protected function getEntityUri(EntityInterface $entity, array $context = []) {
        assert($entity instanceof FileInterface);
        // https://www.drupal.org/project/drupal/issues/2277705 introduced a hack
        // in \Drupal\file\Entity\File::url(), but EntityInterface::url() was
        // deprecated in favor of ::toUrl(). The parent implementation now calls
        // ::toUrl(), but this normalizer (for File entities) needs to override that
        // back to the old behavior because it relies on said hack, not just to
        // generate the value for the 'uri' field of a file (see ::normalize()), but
        // also for the HAL normalization's '_links' value.
        return $entity->createFileUrl(FALSE);
    }

}