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

One solution I've found is to use the Symfony HttpFoundation File class (which is already included as a dependency in Laravel 4):

$file = new Symfony\Component\HttpFoundation\File\File($path);
$mime = $file->getMimeType();

And in fact the File class uses the Symfony MimeTypeGuesser class so this also works:

$guesser = Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesser::getInstance();
echo $guesser->guess($path);

But unfortunately I'm getting unexpected results: I'm getting text/plain instead of text/css when passing a path to a css file.

Answer 2

IF you had just uploaded the file you can use:

Input::file('field_name')->getMimeType();

You can see more here! I hope it be for some help! :D

EDIT:
Input::file is some kind of extention from File, so you may use File::get('file')->getMimeType(); also. Didn't test, but MUST work.

Answer 3

After reading that:

• PHP mime_content_type() is deprecated
• Its replacement FileInfo is unreliable
• Symfony's getMimeType() uses FileInfo (see my other answer)

I decided instead to port Laravel 3's implementation of File::mime() into a helper library within my Laravel 4 application. The Laravel 3 implementation just reads the MIME types from a config lookup array, based on file extension.

Solution:

• Copied application/config/mimes.php from my L3 project to app/config/mimes.php in my L4 project
• Made a FileHelper library with the File::mime() function code from the Laravel 3 File class.

Answer 4

public function mimeType($path)
{
    return finfo_file(finfo_open(FILEINFO_MIME_TYPE), $path);
}

Ref: https://github.com/illuminate/filesystem/blob/master/Filesystem.php#L194

Answer 5

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.