CommentNameConstraint.php

<?php

namespace Drupal\comment\Plugin\Validation\Constraint;

use Drupal\Core\Entity\Plugin\Validation\Constraint\CompositeConstraintBase;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\Core\Validation\Attribute\Constraint;
use Symfony\Component\Validator\Attribute\HasNamedArguments;

/**
 * Supports validating comment author names.
 */
class CommentNameConstraint extends CompositeConstraintBase {
  public function __construct(mixed $options = NULL, public $messageNameTaken = 'The name you used (%name) belongs to a registered user.', public $messageRequired = 'You have to specify a valid author.', public $messageMatch = 'The specified author name does not match the comment author.', ?array $groups = NULL, mixed $payload = NULL) {
    parent::__construct($options, $groups, $payload);
  }
  
  /**
   * {@inheritdoc}
   */
  public function coversFields() {
    return [
      'name',
      'uid',
    ];
  }

}