Auto-determine the mimetype on a attachment

[jiska78]

I'm using SendGrid on my website and it allows a user to attach a file to an email. I used to just have the code $email->addattachment($filename) which no longer works on the new version of SendGrid. The new format is this:

    $attachment = new Attachment();
    $attachment->setContent("xxxx");
    $attachment->setType("application/pdf");
    $attachment->setFilename("balance_001.pdf");
    $attachment->setDisposition("attachment");
    $attachment->setContentId("Balance Sheet");
    $mail->addAttachment($attachment);

My problem with that is, how am I possibly going to know what filetype the user uploads. It could be anything? Can't I just tell sendgrid to attach whatever file is uploaded to the email being sent?

[thinkingserious]

Hello @jiska78,

Currently, we have not implemented mime-type detection in this version of the helper library. A workaround would be to utilize the mimetypes module, specifically mimetypes.guess_type (reference).

I suggest we add a mimetype function to determine the mimetype and then optionally call it within the file_name function. To make this a non-breaking change, we can add a second parameter to file_name that defaults to false.

This issue has been added to our internal backlog to be prioritized. Pull requests and +1s on the issue summary will help it move up the backlog. I will update the title for this issue accordingly.

With best regards,

Elmer