如何在中间件中使用firebase作为node.js的登录认证？

npm install firebase-admin

const admin = require('firebase-admin');

const serviceAccount = require('path/to/serviceAccountKey.json');

admin.initializeApp({
  credential: admin.credential.cert(serviceAccount),
  databaseURL: 'https://your-project-id.firebaseio.com'
});

function isAuthenticated(req, res, next) {
  const idToken = req.headers.authorization;

  admin.auth().verifyIdToken(idToken)
    .then((decodedToken) => {
      req.user = decodedToken;
      next();
    })
    .catch((error) => {
      res.status(401).json({ error: 'Invalid token' });
    });
}

app.get('/protected', isAuthenticated, (req, res) => {
  // 在这里处理受保护的路由
});