ClassResolverConstraintValidator.php

<?php

declare (strict_types=1);
namespace Drupal\Core\Validation\Plugin\Validation\Constraint;

use Drupal\Core\DependencyInjection\ClassResolver;
use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use Symfony\Component\Validator\Exception\UnexpectedTypeException;

/**
 * Validates if a method on a service or instantiated object returns true.
 */
class ClassResolverConstraintValidator extends ConstraintValidator implements ContainerInjectionInterface {
  public function __construct(protected ClassResolver $classResolver) {
  }
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) : static {
    return new static($container->get('class_resolver'));
  }
  
  /**
   * {@inheritdoc}
   */
  public function validate(mixed $value, Constraint $constraint) : void {
    if (!$constraint instanceof ClassResolverConstraint) {
      throw new UnexpectedTypeException($constraint, ClassResolverConstraint::class);
    }
    $service = $this->classResolver
      ->getInstanceFromDefinition($constraint->classOrService);
    if (!method_exists($service, $constraint->method)) {
      throw new \InvalidArgumentException('The method "' . $constraint->method . '" does not exist on the service "' . $constraint->classOrService . '".');
    }
    $result = $service->{$constraint->method}($value);
    if ($result !== TRUE) {
      $this->context
        ->buildViolation($constraint->message)
        ->setParameter('@classOrService', $constraint->classOrService)
        ->setParameter('@method', $constraint->method)
        ->setParameter('@value', $value)
        ->addViolation();
    }
  }

}