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[Mailer][TwigBridge] Add support for translatable subject #59967

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Merged
merged 1 commit into from
Mar 26, 2025
Merged

[Mailer][TwigBridge] Add support for translatable subject #59967

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1 change: 1 addition & 0 deletions src/Symfony/Bridge/Twig/CHANGELOG.md
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Expand Up @@ -6,6 +6,7 @@ CHANGELOG

* Add `is_granted_for_user()` Twig function
* Add `field_id()` Twig form helper function
* Add `TemplatedEmail::getTranslatableSubject()` method

7.2
---
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21 changes: 20 additions & 1 deletion src/Symfony/Bridge/Twig/Mime/TemplatedEmail.php
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Expand Up @@ -18,11 +18,29 @@
*/
class TemplatedEmail extends Email
{
private string|\Stringable|null $subject = null;
private ?string $htmlTemplate = null;
private ?string $textTemplate = null;
private ?string $locale = null;
private array $context = [];

/**
* @return $this
*/
public function subject(string|\Stringable $subject): static
{
parent::subject($subject);

$this->subject = $subject;

return $this;
}

public function getTranslatableSubject(): string|\Stringable|null
{
return $this->subject;
}

/**
* @return $this
*/
Expand Down Expand Up @@ -100,7 +118,7 @@ public function markAsRendered(): void
*/
public function __serialize(): array
{
return [$this->htmlTemplate, $this->textTemplate, $this->context, parent::__serialize(), $this->locale];
return [$this->htmlTemplate, $this->textTemplate, $this->context, parent::__serialize(), $this->locale, $this->subject];
}

/**
Expand All @@ -110,6 +128,7 @@ public function __unserialize(array $data): void
{
[$this->htmlTemplate, $this->textTemplate, $this->context, $parentData] = $data;
$this->locale = $data[4] ?? null;
$this->subject = $data[5] ?? null;

parent::__unserialize($parentData);
}
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17 changes: 17 additions & 0 deletions src/Symfony/Bridge/Twig/Tests/Mime/TemplatedEmailTest.php
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Expand Up @@ -20,7 +20,10 @@
use Symfony\Component\Serializer\Normalizer\MimeMessageNormalizer;
use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
use Symfony\Component\Serializer\Normalizer\PropertyNormalizer;
use Symfony\Component\Serializer\Normalizer\TranslatableNormalizer;
use Symfony\Component\Serializer\Serializer;
use Symfony\Component\Translation\IdentityTranslator;
use Symfony\Component\Translation\TranslatableMessage;

class TemplatedEmailTest extends TestCase
{
Expand All @@ -44,19 +47,22 @@ public function testSerialize()
->htmlTemplate('text.html.twig')
->context($context = ['a' => 'b'])
->locale($locale = 'fr_FR')
->subject($subject = new TranslatableMessage('hello {{ name }}', ['name' => 'John'], 'greetings'))
;

$email = unserialize(serialize($email));
$this->assertEquals('text.txt.twig', $email->getTextTemplate());
$this->assertEquals('text.html.twig', $email->getHtmlTemplate());
$this->assertEquals($context, $email->getContext());
$this->assertEquals($locale, $email->getLocale());
$this->assertEquals($subject, $email->getTranslatableSubject());
}

public function testSymfonySerialize()
{
// we don't add from/sender to check that validation is not triggered to serialize an email
$e = new TemplatedEmail();
$e->subject(new TranslatableMessage('hello.world'));
$e->to('[email protected]');
$e->textTemplate('email.txt.twig');
$e->htmlTemplate('email.html.twig');
Expand All @@ -67,6 +73,7 @@ public function testSymfonySerialize()

$expectedJson = <<<EOF
{
"subject": "hello.world",
"htmlTemplate": "email.html.twig",
"textTemplate": "email.txt.twig",
"locale": "en",
Expand All @@ -84,6 +91,15 @@ public function testSymfonySerialize()
}
],
"headers": {
"subject": [
{
"value": "hello.world",
"name": "Subject",
"lineLength": 76,
"lang": null,
"charset": "utf-8"
}
],
"to": [
{
"addresses": [
Expand All @@ -108,6 +124,7 @@ public function testSymfonySerialize()
$serializer = new Serializer([
new ArrayDenormalizer(),
new MimeMessageNormalizer($propertyNormalizer),
new TranslatableNormalizer(new IdentityTranslator()),
new ObjectNormalizer(null, null, null, $extractor),
$propertyNormalizer,
], [new JsonEncoder()]);
Expand Down
6 changes: 5 additions & 1 deletion src/Symfony/Bundle/TwigBundle/Resources/config/mailer.php
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Expand Up @@ -18,7 +18,11 @@
return static function (ContainerConfigurator $container) {
$container->services()
->set('twig.mailer.message_listener', MessageListener::class)
->args([null, service('twig.mime_body_renderer')])
->args([
null,
service('twig.mime_body_renderer'),
'$translator' => service('translator')->ignoreOnInvalid(),
])
->tag('kernel.event_subscriber')

->set('twig.mime_body_renderer', BodyRenderer::class)
Expand Down
1 change: 1 addition & 0 deletions src/Symfony/Component/Mailer/CHANGELOG.md
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Expand Up @@ -9,6 +9,7 @@ CHANGELOG
* Add DSN param `source_ip` to allow binding to a (specific) IPv4 or IPv6 address.
* Add DSN param `require_tls` to enforce use of TLS/STARTTLS
* Add `DkimSignedMessageListener`, `SmimeEncryptedMessageListener`, and `SmimeSignedMessageListener`
* Add support for translatable subject in `TemplatedEmail`

7.2
---
Expand Down
16 changes: 15 additions & 1 deletion src/Symfony/Component/Mailer/EventListener/MessageListener.php
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Expand Up @@ -11,6 +11,7 @@

namespace Symfony\Component\Mailer\EventListener;

use Symfony\Bridge\Twig\Mime\TemplatedEmail;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\Mailer\Event\MessageEvent;
use Symfony\Component\Mailer\Exception\InvalidArgumentException;
Expand All @@ -19,9 +20,11 @@
use Symfony\Component\Mime\Header\Headers;
use Symfony\Component\Mime\Header\MailboxListHeader;
use Symfony\Component\Mime\Message;
use Symfony\Component\Translation\TranslatableMessage;
use Symfony\Contracts\Translation\TranslatorInterface;

/**
* Manipulates the headers and the body of a Message.
* Manipulates the headers, subject, and the body of a Message.
*
* @author Fabien Potencier <[email protected]>
*/
Expand All @@ -45,6 +48,7 @@
private ?Headers $headers = null,
private ?BodyRendererInterface $renderer = null,
array $headerRules = self::DEFAULT_RULES,
private ?TranslatorInterface $translator = null,
) {
foreach ($headerRules as $headerName => $rule) {
$this->addHeaderRule($headerName, $rule);
Expand All @@ -68,6 +72,7 @@
}

$this->setHeaders($message);
$this->translateSubject($message);
$this->renderMessage($message);
}

Expand Down Expand Up @@ -115,6 +120,15 @@
}
}

private function translateSubject(Message $message): void
{
if (!$message instanceof TemplatedEmail || !$this->translator || !$message->getTranslatableSubject() instanceof TranslatableMessage) {
return;
}

$message->subject($message->getTranslatableSubject()->trans($this->translator, $message->getLocale()));

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src/Symfony/Component/Mailer/EventListener/MessageListener.php:129:63: UndefinedInterfaceMethod: Method Stringable::trans does not exist (see https://psalm.dev/181)

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}

private function renderMessage(Message $message): void
{
if (!$this->renderer) {
Expand Down
24 changes: 24 additions & 0 deletions src/Symfony/Component/Mailer/Tests/EventListener/MessageListenerTest.php
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Expand Up @@ -12,6 +12,7 @@
namespace Symfony\Component\Mailer\Tests\EventListener;

use PHPUnit\Framework\TestCase;
use Symfony\Bridge\Twig\Mime\TemplatedEmail;
use Symfony\Component\Mailer\Envelope;
use Symfony\Component\Mailer\Event\MessageEvent;
use Symfony\Component\Mailer\EventListener\MessageListener;
Expand All @@ -20,6 +21,8 @@
use Symfony\Component\Mime\Header\MailboxListHeader;
use Symfony\Component\Mime\Header\UnstructuredHeader;
use Symfony\Component\Mime\Message;
use Symfony\Component\Translation\TranslatableMessage;
use Symfony\Contracts\Translation\TranslatorInterface;

class MessageListenerTest extends TestCase
{
Expand Down Expand Up @@ -114,4 +117,25 @@ public static function provideHeaders(): iterable
];
yield 'Capitalized header rule (case-insensitive), replace if set' => [$initialHeaders, $defaultHeaders, $defaultHeaders, $rules];
}

public function testTranslatableSubject()
{
$message = new TemplatedEmail();
$message->subject(new TranslatableMessage('hello.world'));
$listener = new MessageListener(translator: new class implements TranslatorInterface {
public function trans(string $id, array $parameters = [], ?string $domain = null, ?string $locale = null): string
{
return 'Hello World';
}

public function getLocale(): string
{
return 'en';
}
});
$event = new MessageEvent($message, new Envelope(new Address('[email protected]'), [new Address('[email protected]')]), 'smtp');
$listener->onMessage($event);

$this->assertSame('Hello World', $message->getSubject());
}
}
3 changes: 2 additions & 1 deletion src/Symfony/Component/Mailer/composer.json
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Expand Up @@ -21,13 +21,14 @@
"psr/event-dispatcher": "^1",
"psr/log": "^1|^2|^3",
"symfony/event-dispatcher": "^6.4|^7.0",
"symfony/mime": "^7.2",
"symfony/mime": "^7.3",
"symfony/service-contracts": "^2.5|^3"
},
"require-dev": {
"symfony/console": "^6.4|^7.0",
"symfony/http-client": "^6.4|^7.0",
"symfony/messenger": "^6.4|^7.0",
"symfony/translation": "^6.4|^7.0",
"symfony/twig-bridge": "^6.4|^7.0"
},
"conflict": {
Expand Down
4 changes: 2 additions & 2 deletions src/Symfony/Component/Mime/Email.php
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Expand Up @@ -58,9 +58,9 @@ class Email extends Message
/**
* @return $this
*/
public function subject(string $subject): static
public function subject(string|\Stringable $subject): static
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This may be a breaking change for apps that extend this class and override this method (https://3v4l.org/uuJj9)

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Supporting a TranslatableInterface is absolutely not the same than supporting Stringable. There is no requirement for TranslatableInterface to be Stringable.

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Yeah, my idea was off the cuff. Needs to be thought out more.

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btw, even for the core TranslatableMessage (that is stringable), casting it to string does not translate it. It returns the translation key.

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@kbond kbond Mar 26, 2025 •
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Right, I thought that'd be fine as that's the behavior of using keys that don't have a translation.

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My thinking was to allow the subject to be any stringable object allowing a listener to intercept. If none does, it would just be cast to a string.

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Adding support for Stringable and then doing weird magic to support TranslatableMessage while the changelog says it adds support for translatable subject (which would be understood as being the interface by many people) looks wrong to me (and limiting as there are valid use cases for other implementations of TranslatableInterface)

{
return $this->setHeaderBody('Text', 'Subject', $subject);
return $this->setHeaderBody('Text', 'Subject', (string) $subject);
}

public function getSubject(): ?string
Expand Down
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