export function makeFileKey ( length = 16 ) { let key = '' ; const table = 'ABDEFGHJKMNPQRTWXYadefhijkmnprstuvwxyz03478' ; for ( let i = 0 ; i < length ; i += 1 ) { key += table . charAt ( Math . floor ( Math . random ( ) * table . length ) ) ; } return key ; }