var base64url = exports;

base64url.unescape = function unescape (str) {
  return (str + Array(5 - str.length % 4).join('=')).replace(/\-/g,'+').replace(/_/g, '/');
};

base64url.escape = function escape (str) {
  return str.replace(/\+/g, '-').replace(/\//g, '_').replace(/=/g, '');
};

base64url.encode = function encode (str) {
  return this.escape(new Buffer(str).toString('base64'));
};

base64url.decode = function decode (str) {
  return new Buffer(this.unescape(str), 'base64').toString();
};