I'm puzzled as to why my Auth0/passport authenticate call is producing an invalid token. Can someone provide guidance on how to address this

My current project involves setting up an auth0 login flow for a node js server that serves a react app. The login and log out flows have been implemented correctly, however, I am encountering an issue with the received token on the /callback URL.

When navigating to /login, it successfully redirects to the Auth0 form where logging in works without any problems based on the logs from Auth0. But upon redirection back to the callback URL, a false token is being presented.


        app.get("/callback", (request, response, next) => {
          passport.authenticate("auth0", (auth0Error, token) => {
            if (!token){
              // At this point, the token is false
            }
            ...
          })(request, response, next);
        });
    

I'm puzzled as to what could be causing this false token issue. Can anyone shed light on how the authenticate function operates within a callback and provide guidance on how to address this situation? Would attempting to authorize through auth0 again be a potential solution?

Answer №1

To troubleshoot the issue, I initiated the project in debug mode and inserted some breakpoints. Upon closer inspection, I noticed that the passport.authenticate() method invokes the Auth0Strategy. Subsequently, Auth0Strategy exchanges code for a token (Authorization Code flow) and retrieves the user profile. Consequently, the token is not accessible in the callback route. To rectify this, I integrated the following lines of code to retrieve the accessToken in the callback route.

const strategy = new Auth0Strategy(
  {
    domain: process.env.AUTH0_DOMAIN,
    clientID: process.env.AUTH0_CLIENT_ID,
    clientSecret: process.env.AUTH0_CLIENT_SECRET,
    callbackURL: '/callback',

  },
  function(accessToken, refreshToken, extraParams, profile, done) {
    // accessToken is the token to call Auth0 API (not needed in most cases)
    // extraParams.id_token has the JSON Web Token
    // profile contains all user information
    console.log(JSON.stringify(profile))
    console.log(accessToken);
    return done(null, profile, accessToken); // Passing access token 
  }
);

As a result, the callback route now includes access to the accessToken.

router.get('/callback', function (req, res, next) {
  passport.authenticate('auth0', function (err, user, token) {
    if (err) { return next(err); }
    if (!user) { return res.redirect('/login'); }
    req.logIn(user, function (err) {
      if (err) { return next(err); }
      const returnTo = req.session.returnTo;
      delete req.session.returnTo;
      res.redirect(returnTo || '/user');
    });
  })(req, res, next);
});

The purpose of these modifications was merely to illustrate the workflow. However, it is advisable to omit passing the token in a production environment.

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