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;

/**
 * Supports validating comment author names.
 */
class CommentNameConstraint extends CompositeConstraintBase {
  
  /**
   * Message shown when an anonymous user comments using a registered name.
   *
   * @var string
   */
  public $messageNameTaken = 'The name you used (%name) belongs to a registered user.';
  
  /**
   * Message shown when an admin changes the comment-author to an invalid user.
   *
   * @var string
   */
  public $messageRequired = 'You have to specify a valid author.';
  
  /**
   * Message shown when the name doesn't match the author's name.
   *
   * @var string
   */
  public $messageMatch = 'The specified author name does not match the comment author.';
  
  /**
   * {@inheritdoc}
   */
  public function coversFields() {
    return [
      'name',
      'uid',
    ];
  }

}