[Mailer] fixed the possibility to set a From header from MessageListener

src/Symfony/Component/Mailer/DelayedSmtpEnvelope.php

@@ -0,0 +1,105 @@
+<?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;
+
+use Symfony\Component\Mailer\Exception\InvalidArgumentException;
+use Symfony\Component\Mailer\Exception\LogicException;
+use Symfony\Component\Mime\Address;
+use Symfony\Component\Mime\Header\Headers;
+use Symfony\Component\Mime\Message;
+use Symfony\Component\Mime\RawMessage;
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @experimental in 4.3
+ *
+ * @internal
+ */
+final class DelayedSmtpEnvelope extends SmtpEnvelope
+{
+    private $senderSet = false;
+    private $recipientsSet = false;
+    private $message;
+
+    public function __construct(RawMessage $message)
+    {
+        if (!$message instanceof Message) {
+            // FIXME: parse the raw message to create the envelope?
+            throw new InvalidArgumentException(sprintf('Unable to create an SmtpEnvelope from a "%s" message.', RawMessage::class));
+        }
+
+        $this->message = $message;
+    }
+
+    public function setSender(Address $sender): void
+    {
+        parent::setSender($sender);
+
+        $this->senderSet = true;
+    }
+
+    public function getSender(): Address
+    {
+        if ($this->senderSet) {
+            return parent::getSender();
+        }
+
+        return self::getSenderFromHeaders($this->message->getHeaders());
+    }
+
+    public function setRecipients(array $recipients): void
+    {
+        parent::setRecipients($recipients);
+
+        $this->recipientsSet = parent::getRecipients();
+    }
+
+    /**
+     * @return Address[]
+     */
+    public function getRecipients(): array
+    {
+        if ($this->recipientsSet) {
+            return parent::getRecipients();
+        }
+
+        return self::getRecipientsFromHeaders($this->message->getHeaders());
+    }
+
+    private static function getRecipientsFromHeaders(Headers $headers): array
+    {
+        $recipients = [];
+        foreach (['to', 'cc', 'bcc'] as $name) {
+            foreach ($headers->getAll($name) as $header) {
+                $recipients = array_merge($recipients, $header->getAddresses());
+            }
+        }
+
+        return $recipients;
+    }
+
+    private static function getSenderFromHeaders(Headers $headers): Address
+    {
+        if ($return = $headers->get('Return-Path')) {
+            return $return->getAddress();
+        }
+        if ($sender = $headers->get('Sender')) {
+            return $sender->getAddress();
+        }
+        if ($from = $headers->get('From')) {
+            return $from->getAddresses()[0];
+        }
+
+        throw new LogicException('Unable to determine the sender of the message.');
+    }
+}

src/Symfony/Component/Mailer/SmtpEnvelope.php

@@ -12,10 +12,7 @@
 namespace Symfony\Component\Mailer;
 
 use Symfony\Component\Mailer\Exception\InvalidArgumentException;
-use Symfony\Component\Mailer\Exception\LogicException;
 use Symfony\Component\Mime\Address;
-use Symfony\Component\Mime\Header\Headers;
-use Symfony\Component\Mime\Message;
 use Symfony\Component\Mime\NamedAddress;
 use Symfony\Component\Mime\RawMessage;
 
@@ -40,14 +37,7 @@ class SmtpEnvelope
 
     public static function create(RawMessage $message): self
     {
-        if ($message instanceof Message) {
-            $headers = $message->getHeaders();
-
-            return new self(self::getSenderFromHeaders($headers), self::getRecipientsFromHeaders($headers));
-        }
-
-        // FIXME: parse the raw message to create the envelope?
-        throw new InvalidArgumentException(sprintf('Unable to create an SmtpEnvelope from a "%s" message.', RawMessage::class));
+        return new DelayedSmtpEnvelope($message);
     }
 
     public function setSender(Address $sender): void
@@ -84,31 +74,4 @@ class SmtpEnvelope
     {
         return $this->recipients;
     }
-
-    private static function getRecipientsFromHeaders(Headers $headers): array
-    {
-        $recipients = [];
-        foreach (['to', 'cc', 'bcc'] as $name) {
-            foreach ($headers->getAll($name) as $header) {
-                $recipients = array_merge($recipients, $header->getAddresses());
-            }
-        }
-
-        return $recipients;
-    }
-
-    private static function getSenderFromHeaders(Headers $headers): Address
-    {
-        if ($return = $headers->get('Return-Path')) {
-            return $return->getAddress();
-        }
-        if ($sender = $headers->get('Sender')) {
-            return $sender->getAddress();
-        }
-        if ($from = $headers->get('From')) {
-            return $from->getAddresses()[0];
-        }
-
-        throw new LogicException('Unable to determine the sender of the message.');
-    }
 }

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

@@ -72,12 +72,13 @@ class SmtpEnvelopeTest extends TestCase
         $this->assertEquals('from@symfony.com', $e->getSender()->getAddress());
     }
 
-    public function testSenderFromHeadersWithoutData()
+    public function testSenderFromHeadersWithoutFrom()
     {
-        $this->expectException(\LogicException::class);
         $headers = new Headers();
         $headers->addMailboxListHeader('To', ['from@symfony.com']);
-        SmtpEnvelope::create(new Message($headers));
+        $e = SmtpEnvelope::create($message = new Message($headers));
+        $message->getHeaders()->addMailboxListHeader('From', ['from@symfony.com']);
+        $this->assertEquals('from@symfony.com', $e->getSender()->getAddress());
     }
 
     public function testRecipientsFromHeaders()

src/Symfony/Component/Mailer/Transport/AbstractTransport.php

@@ -15,6 +15,7 @@ use Psr\Log\LoggerInterface;
 use Psr\Log\NullLogger;
 use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\Mailer\DelayedSmtpEnvelope;
 use Symfony\Component\Mailer\Event\MessageEvent;
 use Symfony\Component\Mailer\Exception\TransportException;
 use Symfony\Component\Mailer\SentMessage;
@@ -62,7 +63,7 @@ abstract class AbstractTransport implements TransportInterface
             $envelope = clone $envelope;
         } else {
             try {
-                $envelope = SmtpEnvelope::create($message);
+                $envelope = new DelayedSmtpEnvelope($message);
             } catch (\Exception $e) {
                 throw new TransportException('Cannot send message without a valid envelope.', 0, $e);
             }