Passport authentication get the name of incoming route

Question

Currently I have the following configuration for passport. Here, each login request is coming from /login/students. The getUserById function finds the user from a STUDENT table stored in database. But login requests can also come from /login/instructors, and in that case I would like to find users from INSTRUCTORS table. But currently there is no way to check the incoming route's name. How would I know that from which route my login request is coming from? Any help appreciated :)

const initialize = (passport) => {
    passport.use(new LocalStrategy({ usernameField: 'username', passwordField: 'password' }, authenticateUser));
    passport.serializeUser((user, done) => done(null, user.ID));
    passport.deserializeUser(async (id, done) => {
        const user = await getUserById(id);
        done(null, user);
    });
};

Code for login router:

router
    .route('/login/students')
    .post(
        checkAuth.not, //login only if user is not in current session
        passport.authenticate('local', {
            successRedirect: '/home/students',
            failureRedirect: '/login/students',
        })
    );

Answer 1

Looks like I found out the solution. Just had to set passReqToCallback to true.

passport.use(new LocalStrategy({ usernameField: 'username', passwordField: 'password' }, authenticateUser));

Then from authencateUser, I could access the req param like this:

const authenticateUser = async (req, username, password, done) => {
    console.log(req.url); //prints from which port this login request came
    //blah blah blah do da di do
};