keep reference to original requested url about passport-wsfed-saml2 HOT 2 OPEN

const redirect_cookie = 'redirect-cookie';

app.use((req, res, next) => {
      if (!req.isAuthenticated()) {
        res.cookie(redirect_cookie, req.path);
        res.redirect('/login');
      } else {
        next();
      }
    });

 app.post('/login/callback', passport.authenticate('wsfed-saml2'), (req, res) => {
    if (req.cookies && req.cookies[redirect_cookie]) {
      res.clearCookie(redirect_cookie);
      res.redirect(req.cookies[redirect_cookie]);
    } else {
      res.redirect('/');
    }
  });