trait RestInspectionTrait in OpenAPI 8

trait RestInspectionTrait {

  /**
   * Gets entity types that are enabled for rest.
   *
   * @param string $entity_type_id
   *   The entity type id.
   *
   * @return \Drupal\Core\Entity\EntityTypeInterface[]
   *   Entity types that are enabled.
   */
  protected function getRestEnabledEntityTypes($entity_type_id = NULL) {
    $entity_types = [];
    $resource_configs = $this
      ->getResourceConfigs();
    foreach ($resource_configs as $resource_config) {
      if ($entity_type = $this
        ->getEntityType($resource_config)) {
        if (!$entity_type_id || $entity_type
          ->id() == $entity_type_id) {
          $entity_types[$entity_type
            ->id()] = $entity_type;
        }
      }
    }
    return $entity_types;
  }

  /**
   * Gets the REST config resources.
   *
   * @param array $options
   *   The options to generate the output.
   *
   * @return \Drupal\rest\RestResourceConfigInterface[]
   *   The REST config resources.
   */
  protected function getResourceConfigs(array $options = []) {
    if (isset($options['entity_type_id'])) {
      $resource_configs[] = $this->entityTypeManager
        ->getStorage('rest_resource_config')
        ->load("entity.{$options['entity_type_id']}");
    }
    else {
      $resource_configs = $this->entityTypeManager
        ->getStorage('rest_resource_config')
        ->loadMultiple();
      if (isset($options['resource_types']) && $options['resource_types'] == 'entities') {
        foreach (array_keys($resource_configs) as $resource_key) {
          if (!$this
            ->isEntityResource($resource_configs[$resource_key])) {
            unset($resource_configs[$resource_key]);
          }
        }
      }
    }
    return $resource_configs;
  }

  /**
   * Determines if an REST resource is for an entity.
   *
   * @param \Drupal\rest\RestResourceConfigInterface $resource_config
   *   The REST config resource.
   *
   * @return bool
   *   True if the resource represents a Drupal entity.
   */
  protected function isEntityResource(RestResourceConfigInterface $resource_config) {
    $resource_plugin = $resource_config
      ->getResourcePlugin();
    return $resource_plugin instanceof EntityResource;
  }

  /**
   * Gets the entity type if any for REST resource.
   *
   * @param \Drupal\rest\RestResourceConfigInterface $resource_config
   *   The REST config resource.
   *
   * @return \Drupal\Core\Entity\EntityTypeInterface|null
   *   The Entity Type or null.
   */
  protected function getEntityType(RestResourceConfigInterface $resource_config) {
    if ($this
      ->isEntityResource($resource_config)) {
      $resource_plugin = $resource_config
        ->getResourcePlugin();
      return $this->entityTypeManager
        ->getDefinition($resource_plugin
        ->getPluginDefinition()['entity_type']);
    }
    return NULL;
  }

}