API Link User Token Auth

import express from 'express';
import { sign } from 'jsonwebtoken';

const app = express();

// Middleware to check if user is authenticated in your system
function requireAuth(req, res, next) {
  if (!req.session.user) {
    return res.redirect('/login');
  }
  next();
}

// Route to redirect authenticated users to Nudj
app.get('/nudj-redirect', requireAuth, (req, res) => {
  const { user } = req.session;
  
  // Prepare user data for Nudj
  const nudjUserData = {
    userId: user.id,
    email: user.email,
    username: user.displayName,
    locale: user.preferredLanguage || 'en'
  };
  
  // Sign the token
  const userToken = sign(
    nudjUserData,
    process.env.NUDJ_CLIENT_SECRET,
    { expiresIn: '1h' }
  );
  
  // Build the Nudj URL
  const nudjDomain = process.env.NUDJ_DOMAIN; // e.g., "yourcompany.nudj.cx"
  const clientId = process.env.NUDJ_CLIENT_ID;
  const nudjUrl = `https://${nudjDomain}/api/link?userToken=${userToken}&clientId=${clientId}`;
  
  // Redirect user to Nudj
  res.redirect(nudjUrl);
});

app.listen(3000, () => {
  console.log('Server running on port 3000');
});

{
  "error": "Invalid token",
  "message": "The provided user token could not be validated",
  "code": "INVALID_TOKEN"
}