commerce_funds-8.x-1.7/src/Plugin/Validation/Constraint/IssuerEqualsCurrentUserConstraintValidator.php

<?php

namespace Drupal\commerce_funds\Plugin\Validation\Constraint;

use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
use Drupal\Core\Session\AccountProxyInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;

/**
 * Validates the IssuerEqualsCurrentUser Constraint.
 *
 * @package commerce_funds
 */
class IssuerEqualsCurrentUserConstraintValidator extends ConstraintValidator implements ContainerInjectionInterface {

  /**
   * The current user.
   *
   * @var \Drupal\Core\Session\AccountProxyInterface
   */
  protected $currentUser;

  /**
   * Class constructor.
   */
  public function __construct(AccountProxyInterface $current_user) {
    $this->currentUser = $current_user;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static(
      $container->get('current_user')
    );
  }

  /**
   * {@inheritdoc}
   */
  public function validate($items, Constraint $constraint) {
    $recipient_id = $items->getValue()[0]['target_id'];
    // Error if user try to make a transaction to itself.
    if ($this->currentUser->id() == $recipient_id) {
      $this->context->addViolation($constraint->message);
    }
  }

}