无法读取未定义的属性会话

Question

我正在尝试实现LDAP活动目录。当我尝试通过前端传递用户凭据时，出现错误无法读取未定义的属性'session'。我认为我没有将会话传递给AD。当我对用户凭据进行硬编码时，我能够对用户进行身份验证。

我该如何解决？

path            = require('path'),
logger          = require('morgan'),
ActiveDirectory = require('activedirectory'),
bodyParser      = require('body-parser'),
dotenv          = require('dotenv'),
passport        = require('passport'),
session         = require('express-session');

app.use(bodyParser.urlencoded({extended: true}));
app.use(bodyParser.json());

app.use(session({
  resave            : true,
  secret            : 'kool',
  saveUninitialized : true,
  cookie            : {}
}));


const Strategy = { 
  url: 'n/a',
  baseDN: 'n/a',
  username: 'n/a',
  password: 'n/a'
}
const ad = new ActiveDirectory(Strategy);
let user;

  app.post('/login', async (req, res) => {
user.session;
  const username = req.body.username;
  const password = req.body.password;
  const loginSuccess = await ad.authenticate(username, password, (err, auth, res, req) => {
  if(err) {
   console.log(`Yo invalid credentials: ***** ${JSON.stringify(err)} ]******* `);
   return 
  } 
  if(auth) {
    req.session.loggedin = true;
    req.session.username = username;
    res.redirect('/index')
    console.log(`User ${username} is Authenticated`);
  } else {
    // res.send('Auth Failed')
    console.log(`Auth failed`)
    res.redirect('/')
  }
  res.end();
  });
});

app.get('/index', function(request, response) {
  if(request.session.loggedin) {
    response.send(`Welcome back, ${request.session.username}`)
    res.render('index', {title: 'Main Page'})
  } else {
    response.redirect('/')
  }
  response.end();
})