passport.js calling this.somemethod throws TypeError: Cannot read property 'somemethod'

Question

I am calling the following from one class:

router.post('/login', ctrlAuth.login);

Then the ctrlAuth is from another class:

login(req, res) {
    passport.authenticate('ldapauth', function (err, user, info) {
        ... // handling err and !user
        ...
        if (user) this.processUser(req, res);
    })(req, res);
}

private processUser(req, res) {...}

Then I get TypeError: Cannot read property 'processUser' of undefined

So far, this is how I did it, but still doesn't work:

login(req, res) {
    const callback = ((err, user, info) => {
        if (user) this.processUser(req, res);
    }).bind(this);
    passport.authenticate('ldapauth', {session: false}, callback)(req, res);
}

Answer 1

There are two ways I thought of fixing this:

1. Bind the ctrlAuth to the method:

   router.post('/login', ctrlAuth.login.bind(ctrlAuth));

2. Create another class and use it as next callback:

   router.post('/login', ctrlAuth.login, ctrlAuth.processUser);

   Inside ctrAuth.login, I call on next();