FieldConfigAddController.php

<?php

declare (strict_types=1);
namespace Drupal\field_ui\Controller;

use Drupal\Core\Controller\ControllerBase;
use Drupal\Core\TempStore\PrivateTempStore;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

/**
 * Controller for building the field instance form.
 *
 * @internal
 */
final class FieldConfigAddController extends ControllerBase {
  
  /**
   * FieldConfigAddController constructor.
   *
   * @param \Drupal\Core\TempStore\PrivateTempStore $tempStore
   *   The private tempstore.
   */
  public function __construct(protected readonly PrivateTempStore $tempStore) {
  }
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static($container->get('tempstore.private')
      ->get('field_ui'));
  }
  
  /**
   * Builds the field config instance form.
   *
   * @param string $entity_type
   *   The entity type.
   * @param string $field_name
   *   The name of the field to create.
   *
   * @return array
   *   The field instance edit form.
   */
  public function fieldConfigAddConfigureForm(string $entity_type, string $field_name) : array {
    // @see \Drupal\field_ui\Form\FieldStorageAddForm::submitForm
    $temp_storage = $this->tempStore
      ->get($entity_type . ':' . $field_name);
    if (!$temp_storage) {
      throw new NotFoundHttpException();
    }
    /** @var \Drupal\Core\Field\FieldConfigInterface $entity */
    $entity = $this->entityTypeManager()
      ->getStorage('field_config')
      ->create([
      $temp_storage['field_config_values'],
      'field_storage' => $temp_storage['field_storage'],
    ]);
    return $this->entityFormBuilder()
      ->getForm($entity, 'default', [
      'default_options' => $temp_storage['default_options'],
    ]);
  }

}