Symfony Profiler

<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Mailer\EventListener;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\Mailer\Event\MessageEvent;
use Symfony\Component\Mime\BodyRendererInterface;
use Symfony\Component\Mime\Header\Headers;
use Symfony\Component\Mime\Message;
/**
* Manipulates the headers and the body of a Message.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class MessageListener implements EventSubscriberInterface
{
private $headers;
private $renderer;
public function __construct(Headers $headers = null, BodyRendererInterface $renderer = null)
{
$this->headers = $headers;
$this->renderer = $renderer;
}
public function onMessage(MessageEvent $event): void
{
$message = $event->getMessage();
if (!$message instanceof Message) {
return;
}
$this->setHeaders($message);
$this->renderMessage($message);
}
private function setHeaders(Message $message): void
{
if (!$this->headers) {
return;
}
$headers = $message->getHeaders();
foreach ($this->headers->all() as $name => $header) {
if (!$headers->has($name)) {
$headers->add($header);
} else {
if (Headers::isUniqueHeader($name)) {
continue;
}
$headers->add($header);
}
}
$message->setHeaders($headers);
}
private function renderMessage(Message $message): void
{
if (!$this->renderer) {
return;
}
$this->renderer->render($message);
}
public static function getSubscribedEvents()
{
return [
MessageEvent::class => 'onMessage',
];
}
}

vendor/symfony/mailer/EventListener/MessageListener.php line 36