Javascript 如何在没有承诺的情况下返回函数中的值（访问令牌）？

我有一个导出为

模块

的函数，因此我可以在主

app.js

中用作

中间件

函数，在登录后，spotify重定向到/callback

由于我不能将其作为承诺，并在它之后使用检索值。然后，我想知道如何获取登录另一个

模块后生成的
access\u令牌

提前感谢您。
您可以在中间件之间共享价值，并在req中定义它。为了更简单的解释，以下是一个示例：

const callback = (req, res) => {

  // your application requests refresh and access tokens
  // after checking the state parameter

  if (state === null || state !== storedState) {
   ...
  } else {
    res.clearCookie(stateKey);
    var authOptions = {...};

//rq = require-promise
    rq.post(authOptions, function(error, response, body) {
      if (!error && response.statusCode === 200) {

        var access_token = body.access_token,
            refresh_token = body.refresh_token;

        // we can also pass the token to the browser to make requests from there
        res.redirect('/#' +
          querystring.stringify({
            access_token: access_token,
            refresh_token: refresh_token
          }));
      } 
    });
  }
};

它将共享给另一个中间件：

// the first middleware : checkAuth.js
const jwt = require('jsonwebtoken')

const authValidator = async (req,res,next) => {
  // check token as requirement for auth user
  let token = req.headers['authorization']
  try {
    let verifiedUser = await jwt.verify(token, 'yoursecret', (err, decode) => {
      if (err) return res.send(err.message)
      return decode
    })
    // assign verifiedUser to req
    req.userData = verifiedUser
    // passing to next middleware
    next()
  } catch (err) {
    return res.send('no token provided')
  }
}

exports.authValidator = authValidator

通过这条路线，您可以获得所有：

// second middleware : checkRole.js
const roleUser = async (req,res,next) => {
  try {
    // call the req.UserData and assign other value
    if (req.UserData) req.userRole = 'Administrator'
    // passing to next middleware
    next()
  } catch (err) {
    return res.send('ooppsss')
  }
}

exports.roleUser = roleUser

您可以在中间件之间共享值，并在req中定义它。为了更简单的解释，以下是一个示例：

const callback = (req, res) => {

  // your application requests refresh and access tokens
  // after checking the state parameter

  if (state === null || state !== storedState) {
   ...
  } else {
    res.clearCookie(stateKey);
    var authOptions = {...};

//rq = require-promise
    rq.post(authOptions, function(error, response, body) {
      if (!error && response.statusCode === 200) {

        var access_token = body.access_token,
            refresh_token = body.refresh_token;

        // we can also pass the token to the browser to make requests from there
        res.redirect('/#' +
          querystring.stringify({
            access_token: access_token,
            refresh_token: refresh_token
          }));
      } 
    });
  }
};

它将共享给另一个中间件：

// the first middleware : checkAuth.js
const jwt = require('jsonwebtoken')

const authValidator = async (req,res,next) => {
  // check token as requirement for auth user
  let token = req.headers['authorization']
  try {
    let verifiedUser = await jwt.verify(token, 'yoursecret', (err, decode) => {
      if (err) return res.send(err.message)
      return decode
    })
    // assign verifiedUser to req
    req.userData = verifiedUser
    // passing to next middleware
    next()
  } catch (err) {
    return res.send('no token provided')
  }
}

exports.authValidator = authValidator

通过这条路线，您可以获得所有：

// second middleware : checkRole.js
const roleUser = async (req,res,next) => {
  try {
    // call the req.UserData and assign other value
    if (req.UserData) req.userRole = 'Administrator'
    // passing to next middleware
    next()
  } catch (err) {
    return res.send('ooppsss')
  }
}

exports.roleUser = roleUser