Well I've managed to get it working in the way I suggested in my question (By writing my own ServiceProvider and TransportManager to allow me to provider a driver). This is what I've done for anyone that might come across this:
config/app.php - Replace Laravel's MailServiceProvider with my own
// ...
'providers' => [
// ...
// Illuminate\Mail\MailServiceProvider::class,
App\MyMailer\MailServiceProvider::class,
// ...
app/MyMailer/MailServiceProvider.php - Create a service provider that extends Laravel's MailServiceProvider and override the registerSwiftTransport() method
<?php
namespace App\MyMailer;
class MailServiceProvider extends \Illuminate\Mail\MailServiceProvider
{
public function registerSwiftTransport()
{
$this->app['swift.transport'] = $this->app->share(function ($app) {
// Note: This is my own implementation of transport manager as shown below
return new TransportManager($app);
});
}
}
app/MyMailer/TransportManager.php - Add a createMailjetDriver method which makes my MailjetTransport driver available to Laravel's Mailer
<?php
namespace App\MyMailer;
use App\MyMailer\Transport\MailjetTransport;
class TransportManager extends \Illuminate\Mail\TransportManager
{
protected function createMailjetDriver()
{
$config = $this->app['config']->get('services.mailjet', []);
return new MailjetTransport(
$this->getHttpClient($config),
$config['api_key'],
$config['secret_key']
);
}
}
app/MyMailer/Transport/MailjetTransport.php - My own Transport driver that sends e-mails through Mailjet.
Updated to contain my implementation of the Mailjet transport driver. Using the Mailjet guide for sending a basic e-mail through their API as a base.
<?php
namespace App\MyMailer\Transport;
use GuzzleHttp\ClientInterface;
use Illuminate\Mail\Transport\Transport;
use Swift_Mime_Message;
class MailjetTransport extends Transport
{
/**
* Guzzle HTTP client.
*
* @var ClientInterface
*/
protected $client;
/**
* The Mailjet "API key" which can be found at https://app.mailjet.com/transactional
*
* @var string
*/
protected $apiKey;
/**
* The Mailjet "Secret key" which can be found at https://app.mailjet.com/transactional
*
* @var string
*/
protected $secretKey;
/**
* The Mailjet end point we're using to send the message.
*
* @var string
*/
protected $endPoint = 'https://api.mailjet.com/v3/send';
/**
* Create a new Mailjet transport instance.
*
* @param \GuzzleHttp\ClientInterface $client
* @param $apiKey
* @param $secretKey
*/
public function __construct(ClientInterface $client, $apiKey, $secretKey)
{
$this->client = $client;
$this->apiKey = $apiKey;
$this->secretKey = $secretKey;
}
/**
* Send the given Message.
*
* Recipient/sender data will be retrieved from the Message API.
* The return value is the number of recipients who were accepted for delivery.
*
* @param Swift_Mime_Message $message
* @param string[] $failedRecipients An array of failures by-reference
*
* @return int
*/
public function send(Swift_Mime_Message $message, &$failedRecipients = null)
{
$this->beforeSendPerformed($message);
$payload = [
'header' => ['Content-Type', 'application/json'],
'auth' => [$this->apiKey, $this->secretKey],
'json' => []
];
$this->addFrom($message, $payload);
$this->addSubject($message, $payload);
$this->addContent($message, $payload);
$this->addRecipients($message, $payload);
return $this->client->post($this->endPoint, $payload);
}
/**
* Add the from email and from name (If provided) to the payload.
*
* @param Swift_Mime_Message $message
* @param array $payload
*/
protected function addFrom(Swift_Mime_Message $message, &$payload)
{
$from = $message->getFrom();
$fromAddress = key($from);
if ($fromAddress) {
$payload['json']['FromEmail'] = $fromAddress;
$fromName = $from[$fromAddress] ?: null;
if ($fromName) {
$payload['json']['FromName'] = $fromName;
}
}
}
/**
* Add the subject of the email (If provided) to the payload.
*
* @param Swift_Mime_Message $message
* @param array $payload
*/
protected function addSubject(Swift_Mime_Message $message, &$payload)
{
$subject = $message->getSubject();
if ($subject) {
$payload['json']['Subject'] = $subject;
}
}
/**
* Add the content/body to the payload based upon the content type provided in the message object. In the unlikely
* event that a content type isn't provided, we can guess it based on the existence of HTML tags in the body.
*
* @param Swift_Mime_Message $message
* @param array $payload
*/
protected function addContent(Swift_Mime_Message $message, &$payload)
{
$contentType = $message->getContentType();
$body = $message->getBody();
if (!in_array($contentType, ['text/html', 'text/plain'])) {
$contentType = strip_tags($body) != $body ? 'text/html' : 'text/plain';
}
$payload['json'][$contentType == 'text/html' ? 'Html-part' : 'Text-part'] = $message->getBody();
}
/**
* Add to, cc and bcc recipients to the payload.
*
* @param Swift_Mime_Message $message
* @param array $payload
*/
protected function addRecipients(Swift_Mime_Message $message, &$payload)
{
foreach (['To', 'Cc', 'Bcc'] as $field) {
$formatted = [];
$method = 'get' . $field;
$contacts = (array) $message->$method();
foreach ($contacts as $address => $display) {
$formatted[] = $display ? $display . " <$address>" : $address;
}
if (count($formatted) > 0) {
$payload['json'][$field] = implode(', ', $formatted);
}
}
}
}
In my .env file I have:
MAIL_DRIVER=mailjet
..which allows me to use Laravel's mailer package (Through the Facade or dependency injection) as normal:
\Mail::send('view', [], function($message) {
$message->to('me@domain.com');
$message->subject('Test');
});
