class ExtraFieldBlockDeriver

class ExtraFieldBlockDeriver extends DeriverBase implements ContainerDeriverInterface {
    use StringTranslationTrait;
    
    /**
     * The entity field manager.
     *
     * @var \Drupal\Core\Entity\EntityFieldManagerInterface
     */
    protected $entityFieldManager;
    
    /**
     * The entity type manager.
     *
     * @var \Drupal\Core\Entity\EntityTypeManagerInterface
     */
    protected $entityTypeManager;
    
    /**
     * The entity type bundle info.
     *
     * @var \Drupal\Core\Entity\EntityTypeBundleInfoInterface
     */
    protected $entityTypeBundleInfo;
    
    /**
     * The entity type repository.
     *
     * @var \Drupal\Core\Entity\EntityTypeRepositoryInterface
     */
    protected $entityTypeRepository;
    
    /**
     * Constructs new FieldBlockDeriver.
     *
     * @param \Drupal\Core\Entity\EntityFieldManagerInterface $entity_field_manager
     *   The entity field manager.
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
     *   The entity type manager.
     * @param \Drupal\Core\Entity\EntityTypeBundleInfoInterface $entity_type_bundle_info
     *   The entity type bundle info.
     * @param \Drupal\Core\Entity\EntityTypeRepositoryInterface $entity_type_repository
     *   The entity type repository.
     */
    public function __construct(EntityFieldManagerInterface $entity_field_manager, EntityTypeManagerInterface $entity_type_manager, EntityTypeBundleInfoInterface $entity_type_bundle_info, EntityTypeRepositoryInterface $entity_type_repository) {
        $this->entityFieldManager = $entity_field_manager;
        $this->entityTypeManager = $entity_type_manager;
        $this->entityTypeBundleInfo = $entity_type_bundle_info;
        $this->entityTypeRepository = $entity_type_repository;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, $base_plugin_id) {
        return new static($container->get('entity_field.manager'), $container->get('entity_type.manager'), $container->get('entity_type.bundle.info'), $container->get('entity_type.repository'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDerivativeDefinitions($base_plugin_definition) {
        $entity_type_labels = $this->entityTypeRepository
            ->getEntityTypeLabels();
        foreach ($this->entityTypeManager
            ->getDefinitions() as $entity_type_id => $entity_type) {
            // Only process fieldable entity types.
            if (!$entity_type->entityClassImplements(FieldableEntityInterface::class)) {
                continue;
            }
            $bundles = $this->entityTypeBundleInfo
                ->getBundleInfo($entity_type_id);
            foreach ($bundles as $bundle_id => $bundle) {
                $extra_fields = $this->entityFieldManager
                    ->getExtraFields($entity_type_id, $bundle_id);
                // Skip bundles without any extra fields.
                if (empty($extra_fields['display'])) {
                    continue;
                }
                foreach ($extra_fields['display'] as $extra_field_id => $extra_field) {
                    $derivative = $base_plugin_definition;
                    $derivative['category'] = $this->t('@entity fields', [
                        '@entity' => $entity_type_labels[$entity_type_id],
                    ]);
                    $derivative['admin_label'] = $extra_field['label'];
                    $context_definition = EntityContextDefinition::fromEntityType($entity_type)->addConstraint('Bundle', [
                        $bundle_id,
                    ]);
                    $derivative['context_definitions'] = [
                        'entity' => $context_definition,
                    ];
                    $derivative_id = $entity_type_id . PluginBase::DERIVATIVE_SEPARATOR . $bundle_id . PluginBase::DERIVATIVE_SEPARATOR . $extra_field_id;
                    $this->derivatives[$derivative_id] = $derivative;
                }
            }
        }
        return $this->derivatives;
    }

}