ClassResolverConstraint.php

<?php

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

use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\Core\Validation\Attribute\Constraint;
use Symfony\Component\Validator\Constraint as SymfonyConstraint;

/**
 * Checks if a method on a service or instantiated object returns true.
 *
 *  For example to call the method 'isValidScheme' on the service
 *  'stream_wrapper_manager', use: ['stream_wrapper_manager', 'isValidScheme'].
 *  It is also possible to use a class if it implements
 *  ContainerInjectionInterface. It will use the ClassResolver to resolve the
 *  class and return an instance. Then it will call the configured method on
 *  that instance.
 *
 *  The called method should return TRUE when the result is valid. All other
 *  values will be considered as invalid.
 */
class ClassResolverConstraint extends SymfonyConstraint {
    
    /**
     * The error message if validation fails.
     *
     * @var string
     */
    public string $message = "Calling '@method' method with value '@value' on '@classOrService' evaluated as invalid.";
    
    /**
     * Class or service.
     *
     * @var array
     */
    public string $classOrService;
    
    /**
     * Method to call.
     *
     * @var string
     */
    public string $method;
    
    /**
     * {@inheritdoc}
     */
    public function getRequiredOptions() : array {
        return [
            'classOrService',
            'method',
        ];
    }

}