code: function (auth, done) {
          !auth.get('nonce') && auth.set('nonce', randomString(6));
          !_.parseInt(auth.get('timestamp')) && auth.set('timestamp', Math.floor(Date.now() / 1e3));
          done(null, true);
      }
docs: Checks the item, and fetches any parameters that are not already provided.
  Sanitizes the auth parameters if needed.
  
  @param {AuthInterface} auth
  @param {AuthHandlerInterface~authPreHookCallback} done