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(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();
        }
    }

}