After updating Laravel to version 9, I can't sign an email inside a Mailable class - email

Question

After updating Laravel to version 9, I can't sign an email inside a Mailable class.
my code in Laravel 6 worked:
<?php
namespace App\Mail;
use Illuminate\Bus\Queueable;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;
class NotificationEmail extends Mailable
{
use Queueable, SerializesModels;
protected $person;
protected $data = [];
/**
* Create a new message instance.
*
* #return void
*/
public function __construct($person, $data)
{
$this->person = $person;
$this->data = $data;
}
/**
* Build the message.
*
* #return $this
*/
public function build()
{
return $this->view('mail.notification.senat')
->replyTo('noreply#example.com')
->subject('Test subject')
->with([
'person' => $this->person,
'data' => $this->data
])
->withSwiftMessage(function ($message){
$smimeSigner = new \Swift_Signers_SMimeSigner(
config('mail.sign_cert'),
[config('mail.sign_key'), config('mail.sign_key_password')]
);
$message->attachSigner($smimeSigner);
});
}
}
my code in Laravel 9 does not work:
<?php
namespace App\Mail;
use Illuminate\Bus\Queueable;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;
use Symfony\Component\Mime\Crypto\SMimeSigner;
use Symfony\Component\Mime\Email;
use Illuminate\Support\Facades\Log;
class NotificationEmail extends Mailable
{
use Queueable, SerializesModels;
protected $person;
protected $data = [];
/**
* Create a new message instance.
*
* #return void
*/
public function __construct($person, $data)
{
$this->person = $person;
$this->data = $data;
}
/**
* Build the message.
*
* #return $this
*/
public function build(): NotificationEmail {
return $this->view('mail.notification.senat')
->replyTo('noreply#example.com')
->subject('Test subject')
->with([
'person' => $this->person,
'data' => $this->data
])
->withSymfonyMessage(function (Email $message){
$certPath = storage_path(env('MAIL_SIGN_CERT'));
$keyPath = storage_path(env('MAIL_SIGN_KEY'));
// see: https://symfony.com/doc/current/mailer.html#signing-and-encrypting-messages
$signer = new SMimeSigner($certPath, $keyPath, env('MAIL_SIGN_KEY_PASSWORD'));
$signer->sign($message);
})
;
}
}
I know that Laravel 9 works with Symfony Mailer. However, the description does not use a Laravel Mailable environment.... See: https://symfony.com/doc/current/mailer.html#signing-and-encrypting-messages
The Laravel9 doc shows the way to customize: https://laravel.com/docs/9.x/mail#customizing-the-symfony-message
But my solution does not work. I get an error, line 48 "$signer->sign($message);"
A message must have a text or an HTML part or attachments.
Do you have a clue and can you help?

Answer 1

I would suggest an event listener for any outbound mail to achieve signing for all outbound mails with Laravel 9 / Symfony Mailer.
<?php
namespace App\Listeners\Mail;
use Illuminate\Mail\Events\MessageSending;
use Symfony\Component\Mime\Crypto\SMimeSigner;
use Symfony\Component\Mime\Email;
class MessageSendingListener
{
public function handle(MessageSending $event)
{
$signer = new SMimeSigner('/path/to/certificate.pem', 'path/to/private.key');
$signedMessage = $signer->sign($event->message);
$event->message->setHeaders($signedMessage->getHeaders());
$event->message->setBody($signedMessage->getBody());
}
}
Full explanation with the Event Service Provider:
https://laracasts.com/discuss/channels/laravel/laravel-9-outbound-smime-messages
Symfony Docs S/MIME:
https://symfony.com/doc/current/mailer.html#s-mime-signer
Cheers :)