Framework: Mail with attachment CSV = bad content-type

[yvestan]

• Laravel Version: 5.8.31
• PHP Version: 7.2.21
• Database Driver & Version: PostgreSQL

Description:

Hello,

I send specific email : plain text, with body totally empty and CSV file on attachment

    public function build()
    {

        return $this->from(env('MAIL_SENDER'))
                    ->bcc(str_replace('@', '+send@', env('MAIL_SENDER')))
                    ->subject($this->cmd_acces->filename)
                    ->text('emails.admin.ftth.cmd_acces.cmd_acces_mailer') // empty blade file
                    ->attach($this->cmd_acces->csvfile, [
                        'as' => $this->cmd_acces->filename,
                        'mime' => 'text/csv',
                    ]);

    }

No problem with Laravel 5.5 but i've just upgraded to Laravel 5.8 and there's a little bug :

The content-type should by "multipart/mixed" but it is now "plain/text"

Laravel 5.5 => OK

Laravel 5.8 => NOK => bad content-type and base64 on body message

I've change Illuminate/Mail/Mailer.php (https://github.com/laravel/framework/blob/6.x/src/Illuminate/Mail/Mailer.php#L332) and that's work fine

Actual

$message->$method($this->renderView($plain, $data), 'text/plain');

My change : just deleted "text/plain" parameter

$message->$method($this->renderView($plain, $data));

I suppose a bug ?

Steps To Reproduce:

send email : plain text, with body totally empty and CSV file on attachment

[driesvints]

This has been the same for 3 years and no one has reported anything like this until now. Are you sure this is related to the framework?

[Sladewill]

Could have sworn I've seen this before when raw mail is used instead of Html due a change in 5.6.

[yvestan]

@driesvints I found the difference between 5.8 and 5.5

https://github.com/laravel/framework/blob/5.8/src/Illuminate/Mail/Mailer.php#L242

https://github.com/laravel/framework/blob/5.5/src/Illuminate/Mail/Mailer.php#L220

On 5.5, call_user_func is after addContent

        $this->addContent($message, $view, $plain, $raw, $data);

        call_user_func($callback, $message);

On 5.8 call_user_func is before addContent

        call_user_func($callback, $message);

        $this->addContent($message, $view, $plain, $raw, $data);

On 5.8, if I move call_user_func like 5.5, that's work fine...

[brunogaspar]

Related pull request https://github.com/laravel/framework/pull/22995

[driesvints]

Hmm this is a tricky one. What would the implications be of reverting that PR?

[arthurvanpasselia]

I used the raw functionality and that made it work without changing the vendor files:

Mail::raw('email.generic', function($m) {
$m->from('[email protected]', 'Your name')
->subject(' CSV export')
->attach($path, [
                    'as' => $file,
                    'mime' => 'text/csv'
                ]);

[nishijain127]

Besides using Mail try some other Method to Send Email
=> Create Jobs
=> Create Events , Mail and Listener
=> They are running background side
=> And You can attach multiple file by binding in Array
=> Use this link, May be this can help
https://laravel.com/docs/6.x/events

[JavierTibi]

I have the same issue with Laravel 6.0.4

$sendMail->attachData($file, $name, [
                    'mime' => 'application/pdf',
                ]);

I receive the plain text instead of the file

--_=_swift_1579548528_6ed8fb3c26cfdc6b05db6e4bc17f28b4_=_
Content-Type: application/pdf; name=qrcodes_from_1094_to_1094.pdf
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename=qrcodes_from_1094_to_1094.pdf

[StratusBase]

Same issue as above, in Laravel 5.6 after upgrade...

//  Init Mailer - Empty Email w/ Attachment
Mail::raw('', function ($message) use($filename, $subject, $recipients, $pdf, $dry_run) {

                // Set Subject & Recipients
                $message->subject($subject)->to($recipients);

                // Attach PDF
                $message->attachData($pdf->output(), "{$filename}.pdf");
});

[StratusBase]

@driesvints I found the difference between 5.8 and 5.5

https://github.com/laravel/framework/blob/5.8/src/Illuminate/Mail/Mailer.php#L242

https://github.com/laravel/framework/blob/5.5/src/Illuminate/Mail/Mailer.php#L220

On 5.5, call_user_func is after addContent

        $this->addContent($message, $view, $plain, $raw, $data);

        call_user_func($callback, $message);

On 5.8 call_user_func is before addContent

        call_user_func($callback, $message);

        $this->addContent($message, $view, $plain, $raw, $data);

On 5.8, if I move call_user_func like 5.5, that's work fine...

I did this to solve my issue after I upgraded from 5.5 to 5.6, this is ridiculous.... Please fix this!!

[Alexander--]

I am the guy, who made 0cd889942c7d and ultimately broke everyone's email in Laravel 5.6

In retrospect the change in #22995 was a bad idea. But I had my reasons!

Anyway, content type like text/plain; boundary... is an obvious nonsense, which makes me think that this is a bug in SwiftMailer.

Internally SwiftMailer represents both primary message and all it's parts as subclasses of Swift_Mime_SimpleMimeEntity and decides on hierarchy (and mime-types of parts) via some weird logic. So perhaps invoking SwiftMessage#attach() before SwiftMessage#setBody() ­causes an attachment to be miscategorised as primary part, which subsequently has it's mime type set to text/plain? Just a wild guess.

[yvestan]

Thank you for explanation @Alexander-- Do you plan to revert to the previous version?

[Alexander--]

I am not a Laravel developer — just a guy, who tried to report bug in Laravel and was told to make necessary fixes myself. But personally I wouldn't revert. The change was breaking, but reverting it now will also break any code, that was written to depend on the current behaviour.

If we look back at the first public Git commit of Laravel, the callback used to be called before addContent() up to Laravel 5.1 (in 2015).

Then @arunpoudel moved it with justification being...

This allows... setting the encoding of the email

Then I moved it back in Laravel 5.6 (in 2018) with exact same justification.

We really should stop moving this callback around and start fixing actual bugs.

It seems like both attach() and attachData() immediately invoke attach() on underlying swift message. Afterwards addContent invokes setBody on a message, that already has some parts (e.g. attachments). This probably messes up some internal state of SwiftMessage.

Could we postpone composing actual SwiftMessage until the email is just about to be sent? Current behaviour of immediately invoking attach() goes back to the first version of Laravel, so changing it may break something else, but in my opinion it is worth a try.

[driesvints]

Sent in a fix for this here: https://github.com/laravel/framework/pull/32272

We now basically prevent the header from being modified if it's already been set on the message.

[driesvints]

We had to revert the fix because it was apparently causing some issues. We'll need to find a different way.

[taylorotwell]

Fixed by using a single space instead of a truly empty string... 🤷

[taylorotwell]

https://github.com/laravel/framework/commit/055762286132d545cbc064dce645562c0d51532f