Creating an attachment for MailMessage - typo3

Question

From my extbase 6.2 extension I want to send different e-mails.
In a controller class I wrote a mail function that looks like this:
(notice no #param for $attachment - see my question at the end)
/**
*
* #param string $to
* #param string $subject
* #param string $email_prefix
* #param string $msg
* #param string $email_suffix
*/
public function mailAction($to, $subject, $email_prefix, $msg, $email_suffix, $attachment = null) {
try {
$from = \TYPO3\CMS\Core\Utility\MailUtility::getSystemFrom();
$body = $email_prefix
. PHP_EOL . PHP_EOL
. $msg
. PHP_EOL . PHP_EOL
. $email_suffix;
$htmlBody = nl2br($body);
$toEmail = $to;
$mail = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Mail\\MailMessage');
$mail->setFrom($from)
->setTo(array($toEmail))
->setSubject($subject)
->setBody($htmlBody, 'text/html');
$mail->addPart($body, 'text/plain');
if ($attachment) {
$mail->attach($attachment);
}
if (empty($toEmail) || strpos($toEmail, '#') === FALSE) {
$this->addFlashMessage('Die Mail konnte nicht verschickt werden! Keine Email-Adresse des Empfängers', '', \TYPO3\CMS\Core\Messaging\FlashMessage::ERROR
);
} else {
if ($mail->send()) {
$this->addFlashMessage('Die Mail für wurde verschickt!', '');
} else {
$this->addFlashMessage('Die Mail konnte nicht verschickt werden!', '', \TYPO3\CMS\Core\Messaging\FlashMessage::ERROR
);
}
}
$this->redirect('list');
} catch (Exception $e) {
echo 'Caught exception: ', $e->getMessage(), "\n";
}
}
In a function that calls the mail function I tried creating an attachment like this but it failed saying: Fatal error: Class 'Swift_Attachment' not found in.../...Controller.php
$attachment = \Swift_Attachment::newInstance()
->setFilename('Termine.html')
->setContentType('text/html')
->setBody($emailView->render());
Then I call the mail function like this:
$this->redirect('mail', null, null, array(
$to,
$subject,
$email_prefix,
$msg,
$email_suffix,
$attachment));
My questions:
How can I successfully create an object of type Swift_Attachment in a controller of my extbase extension (without creating a MailMessage object beforehand and creating the attachment inside of it)?
What should I put after #param as the type of my $attachment variable in my mail function for this to work?
-- EDIT --
Ok, so apparently no one does that because it's not meant to be.
I now used Rene's approach combining it with Dimitri's scalable answer for multiple attachments. My #param is now array because I have to create the actual attachment after instantiating MailMessage - thanks!

Answer 1

In my extension for 6.2.25 ist works without any including:
$email->attach(\Swift_Attachment::newInstance(
$emailView->render(),
'Termine.html',
'text/html'
));
So you should check why your autoload of classes don't work. Have you tried to clear the cache complete?
To your second question: the correct param declaration should be:
#param \Swift_Mime_Attachment $attachment
But I wouldn't make an redirect, but an $this->forward. You don't need an redirection on client side for this. If this action is only called by an other action I also recommend to make it an protected function an call it directly from your action:
$this->sendMail($to, $subject, $email_prefix, $msg, $email_suffix, $attachment)
-- EDIT --
I recommend to use bypass the attachment information to the function to create the attachment object after the SwitftMailer was initialized:
/**
*
* #param string $to
* #param string $subject
* #param string $email_prefix
* #param string $msg
* #param string $email_suffix
* #param array $attachment
*/
public function mailAction($to, $subject, $email_prefix, $msg, $email_suffix, $attachment = null) {
...
if (is_array($attachment) && array_key_exist('content', $attachment) && array_key_exist('filename', $attachment) && array_key_exist('mime', $attachment)) {
$mail->attach(\Swift_Attachment::newInstance($attachment['content'], $attachment['filename'], $attachment['mime']));
}
...
}

Answer 2

In \TYPO3\CMS\Core\Mail\MailMessage there is a require_once for the swiftmailer classes; they don't seem to be autoloaded. Maybe you can pass the attachment as rendered HTML and create the Swift_Attachment object after instantiating the MailMessage object?
If the solution in 1. works it would be a simple string.

Answer 3

As already stated by Jigal van Hemert you can only create the attachment objects after you create the MailMessage object because the class is not autoloaded. I would just pass the attachment as a filepath to your mail function and it should be handled there and not outside.
if ($attachment) {
$email->attach(\Swift_Attachment::fromPath($attachment));
}
In my opinion it makes more sense if you can pass multiple files instead of one, so the $attachment should be an $attachments array
if(count($attachments)) {
foreach ($attachments as $name => $file) {
if(file_exists($file)) {
if(trim($name) && !is_numeric($name)) {
$email->attach(\Swift_Attachment::fromPath($file)->setFilename($name));
} else {
$email->attach(\Swift_Attachment::fromPath($file));
}
}
}
}