JS promise。一些 node.js 和护照 js。 如何从 promise {{}} 获取内部结构？ 请求用户

Question

I can't get an item from req.user, when I try to see what's in req.user, it displays:

Promise {
  {
    login: 'login',
    password: '$2b$10$sivL/8KvPYzlN/b24nWNOOa7pd02WX',
    id: 12,
    role: 'user'
  }
}

It turns out that I can output Promise { {} }, but I only need the internal structure, how can I get it for further processing (take for example only the role)?

req.user is sets there (According to the guide)

const LocalStrategy = require('passport-local').Strategy
const bcrypt = require('bcrypt')

function initialize(passport, getUserByEmail, getUserById) {
  const authenticateUser = async (email, password, done) => {
    const user = await getUserByEmail(email)
    if (user == null) {
      return done(null, false, { message: 'No user with that email' })
    }

    try {
      if (await bcrypt.compare(password, user.password)) {
        return done(null, user)
      } else {
        return done(null, false, { message: 'Password incorrect' })
      }
    } catch (e) {
      return done(e)
    }
  }

  passport.use(new LocalStrategy({ usernameField: 'email' }, authenticateUser))
  passport.serializeUser((user, done) => done(null, user.id))
  passport.deserializeUser((id, done) => {
    return done(null, getUserById(id))
  })
}

module.exports = initialize

Answer 1

EDIT: After seeing your strategy, I can see the issue is in deserializeUser . It looks like getUserById returns a promise, so you need to get the result first:

  passport.deserializeUser(async (id, done) => {
    const user = await getUserById(id);
    return done(null, user);
  })

---

Previous answer in case it helps someone else:

Your issue is most likely in your login strategy and not where you want to consume req.user .

Assuming you're using the LocalStrategy for passport, you return the final resolved user record in the callback like so:

passport.use(new LocalStrategy(
  function(username, password, done) {
    // Example service returning a promise
    UserService.loginWithPassword({ username, password }.then((user) => {
      if (!user) return done(null, false);
      return done(null, user);
    }).catch(error => {
      return done(err);
    });
  }
));

If you don't resolve the promise with await or then , you will end up with a promise for req.user like you have in your question:

passport.use(new LocalStrategy(
  function(username, password, done) {
    // Example service returning a promise
    const user = UserService.loginWithPassword({ username, password });
    // user will always be a promise here
    if (!user) return done(null, false);
    return done(null, user);
    // now `req.user` is the promise, instead of the user object
  }
));