[Mailer] Add a way to inject Stamps when sending an email via Messenger

src/Symfony/Component/Mailer/Event/MessageEvent.php

@@ -19,8 +19,10 @@
  * Allows the transformation of a Message and the Envelope before the email is sent.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @final
  */
-final class MessageEvent extends Event
+class MessageEvent extends Event
 {
     private RawMessage $message;
     private Envelope $envelope;

src/Symfony/Component/Mailer/Event/QueuingMessageEvent.php

@@ -0,0 +1,45 @@
+<?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\Event;
+
+use Symfony\Component\Mailer\Envelope;
+use Symfony\Component\Messenger\Stamp\StampInterface;
+use Symfony\Component\Mime\RawMessage;
+
+/**
+ * Allows the transformation of a Message, the Envelope, and the Messenger stamps before the email is sent to the Messenger bus.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+final class QueuingMessageEvent extends MessageEvent
+{
+    /** @var StampInterface[] $stamps */
+    private array $stamps = [];
+
+    public function __construct(RawMessage $message, Envelope $envelope, string $transport)
+    {
+        parent::__construct($message, $envelope, $transport, true);
+    }
+
+    public function addStamp(StampInterface $stamp): void
+    {
+        $this->stamps[] = $stamp;
+    }
+
+    /**
+     * @return StampInterface[]
+     */
+    public function getStamps(): array
+    {
+        return $this->stamps;
+    }
+}

src/Symfony/Component/Mailer/Mailer.php

@@ -13,6 +13,7 @@
 
 use Psr\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Mailer\Event\MessageEvent;
+use Symfony\Component\Mailer\Event\QueuingMessageEvent;
 use Symfony\Component\Mailer\Exception\TransportExceptionInterface;
 use Symfony\Component\Mailer\Messenger\SendEmailMessage;
 use Symfony\Component\Mailer\Transport\TransportInterface;
@@ -44,6 +45,7 @@ public function send(RawMessage $message, Envelope $envelope = null): void
             return;
         }
 
+        $stamps = [];
         if (null !== $this->dispatcher) {
             // The dispatched event here has `queued` set to `true`; the goal is NOT to render the message, but to let
             // listeners do something before a message is sent to the queue.
@@ -52,12 +54,13 @@ public function send(RawMessage $message, Envelope $envelope = null): void
             // Listeners should act depending on the `$queued` argument of the `MessageEvent` instance.
             $clonedMessage = clone $message;
             $clonedEnvelope = null !== $envelope ? clone $envelope : Envelope::create($clonedMessage);
-            $event = new MessageEvent($clonedMessage, $clonedEnvelope, (string) $this->transport, true);
+            $event = new QueuingMessageEvent($clonedMessage, $clonedEnvelope, (string) $this->transport);
             $this->dispatcher->dispatch($event);
+            $stamps = $event->getStamps();
         }
 
         try {
-            $this->bus->dispatch(new SendEmailMessage($message, $envelope));
+            $this->bus->dispatch(new SendEmailMessage($message, $envelope), $stamps);
         } catch (HandlerFailedException $e) {
             foreach ($e->getNestedExceptions() as $nested) {
                 if ($nested instanceof TransportExceptionInterface) {

src/Symfony/Component/Mailer/Tests/MailerTest.php

@@ -13,13 +13,14 @@
 
 use PHPUnit\Framework\TestCase;
 use Psr\EventDispatcher\EventDispatcherInterface;
-use Symfony\Component\Mailer\Event\MessageEvent;
+use Symfony\Component\Mailer\Event\QueuingMessageEvent;
 use Symfony\Component\Mailer\Exception\LogicException;
 use Symfony\Component\Mailer\Mailer;
 use Symfony\Component\Mailer\Transport\NullTransport;
 use Symfony\Component\Mailer\Transport\TransportInterface;
 use Symfony\Component\Messenger\Envelope;
 use Symfony\Component\Messenger\MessageBusInterface;
+use Symfony\Component\Messenger\Stamp\StampInterface;
 use Symfony\Component\Mime\Email;
 use Symfony\Component\Mime\RawMessage;
 
@@ -37,19 +38,24 @@ public function testSendMessageToBus()
     {
         $bus = new class() implements MessageBusInterface {
             public $messages = [];
+            public $stamps = [];
 
             public function dispatch($message, array $stamps = []): Envelope
             {
                 $this->messages[] = $message;
+                $this->stamps = $stamps;
 
                 return new Envelope($message, $stamps);
             }
         };
 
+        $stamp = $this->createMock(StampInterface::class);
+
         $dispatcher = $this->createMock(EventDispatcherInterface::class);
         $dispatcher->expects($this->once())
             ->method('dispatch')
-            ->with(self::callback(static function (MessageEvent $event) {
+            ->with(self::callback(static function (QueuingMessageEvent $event) use ($stamp) {
+                $event->addStamp($stamp);
                 return 'Time for Symfony Mailer!' === $event->getMessage()->getSubject();
             }))
             ->willReturnArgument(0)
@@ -68,5 +74,7 @@ public function dispatch($message, array $stamps = []): Envelope
 
         self::assertCount(1, $bus->messages);
         self::assertSame($email, $bus->messages[0]->getMessage());
+        self::assertCount(1, $bus->stamps);
+        self::assertSame([$stamp], $bus->stamps);
     }
 }