elFinder How to get protocol name

I open elFinder in popup window and i got files in this callback:

getFileCallback: function (file) {
 var w = window.opener || window.parent || window;
     w.postMessage && w.postMessage(JSON.stringify(file), '*');
     $('#elfinder').remove();          
},

Is it possible to get source protocol each of file: dropbox, gdrive, ftp?

If you are using official PHP volume drivers.

getFileCallback: function (file) {
 var w = window.opener || window.parent || window;
     var drivers = {
        bd: 'Box',
        db: 'Dropbox',
        f:  'FTP',
        gd: 'GoogleDrive',
        l:  'LocalFileSystem',
        od: 'OneDrive',
     }, m;
     if (m = file.hash.match(/^(bd|db|f|gd|l|od)/)) {
        file.driver = drivers[m[1]];
     }
     w.postMessage && w.postMessage(JSON.stringify(file), '*');
     $('#elfinder').remove();          
},

Please check file.driver.