lib/helpers.js
function(fileId) {
        var pos = fileId.indexOf('/')
        return {
            group: fileId.substring(0, pos),
            filename: fileId.substring(pos + 1)
        }
    }
function(fileId) {
        var pos = fileId.indexOf('/')
        return {
            group: fileId.substring(0, pos),
            filename: fileId.substring(pos + 1)
        }
    }
function ( fileId ) { var pos = fileId . indexOf ( '/' ) return { group : fileId . substring ( 0 , pos ) , filename : fileId . substring ( pos + 1 ) } }
file id conver to group and filename
@param fileId
@returns {{group: string, filename: string}}
file id conver to group and filename