postoffice-1.0.x-dev/src/MailerMiddleware/AnonymousUser.php

<?php

namespace Drupal\postoffice\MailerMiddleware;

use Drupal\Core\Session\AccountSwitcherInterface;
use Drupal\Core\Session\AnonymousUserSession;
use Symfony\Component\Mailer\Envelope;
use Symfony\Component\Mailer\MailerInterface;
use Symfony\Component\Mime\RawMessage;

/**
 * Implements a mailer middleware which always switches to the anonymous user.
 */
class AnonymousUser implements MailerInterface {

  /**
   * The decorated mailer.
   */
  protected MailerInterface $mailer;

  /**
   * Account switcher service.
   */
  protected AccountSwitcherInterface $accountSwitcher;

  /**
   * Constructs new anonymous account mailer middleware.
   */
  public function __construct(MailerInterface $mailer, AccountSwitcherInterface $accountSwitcher) {
    $this->mailer = $mailer;
    $this->accountSwitcher = $accountSwitcher;
  }

  /**
   * {@inheritdoc}
   */
  public function send(RawMessage $message, ?Envelope $envelope = NULL): void {
    $this->accountSwitcher->switchTo(new AnonymousUserSession());
    try {
      $this->mailer->send($message, $envelope);
    }
    finally {
      $this->accountSwitcher->switchBack();
    }
  }

}