TransportServiceFactory.php

<?php

declare (strict_types=1);
namespace Drupal\Core\Mailer;

use Drupal\Core\Config\ConfigFactoryInterface;
use Symfony\Component\DependencyInjection\Attribute\AutowireIterator;
use Symfony\Component\Mailer\Transport\Dsn;
use Symfony\Component\Mailer\Transport\TransportInterface;

/**
 * The default mailer transport service factory.
 */
class TransportServiceFactory implements TransportServiceFactoryInterface {
    use TransportServiceFactoryTrait;
    
    /**
     * Constructs a new transport service factory.
     *
     * @param Iterable<TransportFactoryInterface> $factories
     *   A list of transport factories.
     * @param \Drupal\Core\Config\ConfigFactoryInterface $configFactory
     *   The config factory service.
     */
    public function __construct(iterable $factories, ConfigFactoryInterface $configFactory) {
        $this->factories = $factories;
    }
    
    /**
     * {@inheritdoc}
     */
    public function createTransport() : TransportInterface {
        $dsn = $this->configFactory
            ->get('system.mail')
            ->get('mailer_dsn');
        $dsnObject = new Dsn(...$dsn);
        return $this->fromDsnObject($dsnObject);
    }

}