如何将用户数据发送到节点 js 中的下一个函数？

我想实现检查是否有令牌的功能，验证令牌并授予对受保护路由的访问权限，但我不知道如何将用户数据发送到下一个功能

authController.js 文件 -

exports.protect = async (req, res, next) => {
  //1) Getting token and check if it's there
  let token;
  if (
    req.headers.authorization &&
    req.headers.authorization.startsWith("Bearer")
  ) {
    token = req.headers.authorization.split(" ")[1];
  } else if (req.cookies.jwt) {
    token = req.cookies.jwt;
  }

  if (!token) {
    res.status(401).json({
      status: "fail",
      message: "You are not logged in. Please login to get access",
    });
    next();
  }
  //2) Verificating the token

  //const decoded = await promisify(jwt.verify)(token, process.env.JWT_SECRET);
  
  const decoded = jwt.verify(token, process.env.JWT_SECRET);
  
  let currentUser;
  //3)Check if user still exists
  db.getConnection(async (err, connection) => {
    const sqlSearch = "SELECT * FROM users WHERE id = ?";
    const sqlQuery = mysql.format(sqlSearch, [decoded.id]);
    connection.query(sqlQuery, (err, result) => {
      connection.release();
      currentUser = result;
    });
  });
  if (!currentUser) {
    res.status(401).json({
      status: "fail",
      message: "The user belonging to this token does no longer exist",
    });
    next();
  }

  //GRANT ACCESS TO PROTECTED ROUTE
  req.user = currentUser;
  res.locals.user = currentUser;
  next();
};

courseRouter.js 文件 -

const express = require('express');
const coursesController = require('../controllers/coursesController');
const authController = require('../controllers/authController');
const router = express.Router();

router.get('/', coursesController.getAllCourses);
router.post('/:slug', authController.protect, coursesController.buyCourse);

module.exports = router;

连接到数据库后，我不知道如何将用户数据返回给 buyCourse() 函数。我这样做的方式“currentUser”是未定义的。

我建议使用

AsyncLocalStorage

使用方法可以参考Node.js文档：https://nodejs/api/async_context.html

AsyncLocalStorage

run()