FileEncodingConstraint.php

<?php

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

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

/**
 * Defines an encoding constraint for files.
 */
class FileEncodingConstraint extends SymfonyConstraint {
  public function __construct(public array $encodings, public string $message = "The file is encoded with %detected. It must be encoded with %encoding", ?array $groups = NULL, mixed $payload = NULL) {
    parent::__construct(groups: $groups, payload: $payload);
  }

}