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In a Laravel 7 application I am uploading images. In my last batch I uploaded roughly 600 jpegs and 80 of these jpegs failed to be uploaded becaus of a Laravel validation error. The other jpegs were uploaded successful.

I checked all these 80 jpegs manually via Ubuntu command line tool file and also via php-interactive-mode finfo. Both tell that the mime-type is image/jpeg.

But my code in Laravel

    $this->validate($request, [
        'file'  => 'required',
        'file'  => 'file',
        'file'  => 'mime-types:image/jpeg'
    ]);

returns message: "The given data was invalid.", errors: {file: ["validation.mime_types"]}} beause the mime-type was evaluated to be application/octet-stream from Laravel.

I then thought okay, Laravel might do some special coding. Therefore I checked the source-code of Laravel at FileinfoMimeTypeGuesser.php and at FileBinaryMimeTypeGuesser.php. But Laravel obviously only either uses file -b --mime -- %s or new \finfo(\FILEINFO_MIME_TYPE, $this->magicFile); so nothing special at all.

And both code-options result in (as written before) image/jpeg when I use file on the Ubuntu command line or finfo in an interactive-mode php session for any of the above mentioned 80 jpegs which Laravel rejected.

Can anyone help me on this? How is Laravel determining the mime-type? Maybe there is a magic database in Laravel which I need to update?

Thanks in advance.

Steevie
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  • try this question [Why does Laravel's getMimeType() method identify a file as “application/octet-stream” when the file has the type attribute of “audio/mpeg”?](https://stackoverflow.com/questions/39594854/why-does-laravels-getmimetype-method-identify-a-file-as-application-octet-st) – bhucho Jan 24 '21 at 08:40
  • Hi @bhucho. I did read the question you are referring to and the answers. They basically acknowledge that Laravel is wrong and suggest to use other functions. Certainly I could do that, but this is not really elegant. I try to understand where Laravel's mistake is in the Laravel source-code. Therefore please help me to identify this in Laravel source-code. Or maybe it might also be the magic-database which needs to be updated. T – Steevie Jan 24 '21 at 10:00

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