Replacement for File::mime() in Laravel 4 (to get mime type from file extension)

Question

Laravel 3 had a File::mime() method which made it easy to get a file\'s mime type from its extension:

$extension = File::extension($path);
$         


        

Answer 1

It turned out that Symfony ExtensionGuesser and MimeTypeGuesser use unreliable FileInfo class. For that reason validation of mimes return unpredictable results and can not be used with files uploads in a proper way (it returns text/plain mime for js, xls, po etc.).

I've found very simple solution for this problem.

Instead of

'attachment' => 'required|mimes:jpg,jpeg,bmp,png,doc,docx,zip,rar,pdf,rtf,xlsx,xls,txt|max:10000',

I split that into two different parts and now my validation looks like this:

private function createFileAttachmentValidator($file)
{
    return Validator::make(
        [
            'attachment' => $file,
            'extension'  => \Str::lower($file->getClientOriginalExtension()),
        ],
        [
            'attachment' => 'required|max:10000',
            'extension'  => 'required|in:jpg,jpeg,bmp,png,doc,docx,zip,rar,pdf,rtf,xlsx,xls,txt',
        ],
        $this->validationMessages()
    );          
}   

I simply try to verify that extension of the file is present and that it is listed in my in rule. That works, however, solution is not perfect.