問題Node Express（）在中間件和路由之間傳輸解碼用戶ID

Question

我知道有一個類似的問題要求給這個，但它從來沒有明確回答（NodeJS Express Router, pass decoded object between middleware and route?）。

我嘗試使用VerifyOrdinaryUser函數作爲favorites.js路由中的中間件。這個函數應該在叫做req.decoded的請求中創建一個包含用戶信息的字段。我需要在favorites.js中訪問這個用戶信息，但是當我嘗試記錄它時，它顯示爲未定義。是否有關於異步代碼的問題？我不知道如何解決這個問題。謝謝！

Verify.js：

//verify.js 
    var User = require('../models/users'); 
    var jwt = require('jsonwebtoken'); // used to create, sign, and verify tokens 
    var config = require('../config.js'); 

    exports.getToken = function (user) { 
     return jwt.sign(user, config.secretKey, { 
      expiresIn: 3600 
     }); 
    }; 

    exports.verifyOrdinaryUser = function (req, res, next) { 
     // check header or url parameters or post parameters for token 
     var token = req.body.token || req.query.token || req.headers['x-access-token']; 

     // decode token 
     if (token) { 
      // verifies secret and checks exp 
      jwt.verify(token, config.secretKey, function (err, decoded) { 
       if (err) { 
        var err = new Error('You are not authenticated!'); 
        err.status = 401; 
        return next(err); 
       } else { 
        // if everything is good, save to request for use in other routes 
        req.decoded = decoded; 
        req.params.id = req.decoded._doc_id; 
        next(); 
       } 
      }); 
     } else { 
      // if there is no token 
      // return an error 
      var err = new Error('No token provided!'); 
      err.status = 403; 
      return next(err); 
     } 
    }; 

    exports.verifyAdmin = function (req, res, next) { 
     if (req.decoded._doc.admin == false) { 
      next(); 
     } else { 
      // if the user is not admin 
      // return an error 
      var err = new Error('You are not authorized to perform this operation!'); 
      err.status = 403; 
      return next(err); 
     } 

    }; 

Favorites.js：

var express = require('express'); 
var router = express.Router(); 
var passport = require('passport'); 
var User = require('../models/users'); 
var Favorite = require('../models/favorites'); 
var Verify = require('./verify'); 

router.get('/', Verify.verifyOrdinaryUser, function(res, req, next){ 
    console.log(req.decoded); 
}); 

App.js：（看沒有必要）

var express = require('express'); 
var path = require('path'); 
var favicon = require('serve-favicon'); 
var logger = require('morgan'); 
var cookieParser = require('cookie-parser'); 
var bodyParser = require('body-parser'); 
var mongoose = require('mongoose'); 
var passport = require('passport'); 
var LocalStrategy = require('passport-local').Strategy; 

var index = require('./routes/index'); 
var users = require('./routes/users'); 
var dishes = require('./routes/dishes'); 
var favorites = require('./routes/favorites'); 
var app = express(); 

// view engine setup 
app.set('views', path.join(__dirname, 'views')); 
app.set('view engine', 'jade'); 

// uncomment after placing your favicon in /public 
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico'))); 
app.use(logger('dev')); 
app.use(bodyParser.json()); 
app.use(bodyParser.urlencoded({ extended: false })); 
app.use(cookieParser()); 

var User = require('./models/users'); 
app.use(passport.initialize()); 
passport.use(new LocalStrategy(User.authenticate())); 
passport.serializeUser(User.serializeUser()); 
passport.deserializeUser(User.deserializeUser()); 

app.use(express.static(path.join(__dirname, 'public'))); 

var url = 'mongodb://localhost:27017/conFusion'; 
mongoose.connect(url); 
var db = mongoose.connection; 
db.on('error', console.error.bind(console, 'connection error:')); 
db.once('open', function() { 
    // we're connected! 
    console.log("Connected correctly to server"); 
}); 


app.use('/', index); 
app.use('/dishes', dishes); 
app.use('/users', users); 
app.use('/favorites', favorites); 

// catch 404 and forward to error handler 
app.use(function(req, res, next) { 
    var err = new Error('Not Found'); 
    err.status = 404; 
    next(err); 
}); 

// error handler 
app.use(function(err, req, res, next) { 
    // set locals, only providing error in development 
    res.locals.message = err.message; 
    res.locals.error = req.app.get('env') === 'development' ? err : {}; 

    // render the error page 
    res.status(err.status || 500); 
    res.render('error'); 
}); 

module.exports = app; 

Answer 1

是否有問題關於異步代碼？

不，您在callback中調用next（），因此在異步事件完成時調用下一個中間件。

問題是因爲你弄亂了參數的順序。嘗試用 function(req, res, next)代替function(res, req, next)。