快遞：無法在同一時間

Question

訪問POST數據和設置cookie的我正在寫一個應用程序，需要在POST請求，並設置一個cookie從POST信息拉昇。我被卡在一個catch 22.在第一個代碼示例中，我可以設置cookie但不能訪問數據，在第二次我可以訪問數據但不能設置cookie。我確信我錯過了中間件工作原理的一些基本概念，但我無法爲我的生活找到所需的信息。

下面的代碼創建如預期的Cookie，但我的變量後變得不確定

var express = require('express') 
    , routes = require('./routes') 
    , user = require('./routes/user') 
    , handshake = require('./routes/handshake') 
    , http = require('http') 
    , path = require('path'); 

var app = express(); 
app.set('port', process.env.PORT || 3000); 
app.set('views', __dirname + '/views'); 
app.use(express.cookieParser()); 
app.use(express.bodyParser()); 
app.use(express.methodOverride()); 
app.use(function (req, res, next) { 
    var cookie = req.cookies.cokkieName; 
    console.log("cookie_name" , cookie); 
    if (cookie === undefined) 
    { 
      //cookie is set but I can't use req.post.xxxx. It"s always undefined 
     res.cookie("price", 111, { maxAge: 10000 }); 
     console.log('cookie has been created successfully'); 
    } 
    else 
    { 
     console.log('cookie exists', cookie); 
    } 
    next(); 
}); 

app.use(app.router); 
app.use(require('stylus').middleware(__dirname + '/public')); 
app.use(express.static(path.join(__dirname, 'public'))); 
app.post('/handshake', handshake.token); 

http.createServer(app).listen(app.get('port'), function(){ 
    console.log('Express server listening on port ' + app.get('port')); 
}); 

下面的代碼執行setCookie方法回調（因爲控制檯輸出顯示出來），並在控制檯上的正確定義變量，但該cookie未設置。

var express = require('express') 
    , routes = require('./routes') 
    , user = require('./routes/user') 
    , handshake = require('./routes/handshake') 
    , http = require('http') 
    , path = require('path'); 

var app = express(); 

app.set('port', process.env.PORT || 3000); 
app.set('views', __dirname + '/views'); 
app.use(express.cookieParser()); 
app.use(express.bodyParser()); 
app.use(express.methodOverride()); 


var setCookie = function (req, res, next) { 
    var cookie = req.cookies.cokkieName; 
    console.log("cookie_name" , cookie); 
    if (cookie === undefined) 
    { 

     res.cookie("price", 111, { maxAge: 10000 }); 
      //in the console the post.body.xxxx data appears correctly but no cookie!!! 
     console.log('cookie has been created successfully',post.body.xxx); 
    } 
    else 
    { 
     console.log('cookie exists', cookie); 
    } 
    next(); 
}; 
app.use(app.router); 
app.use(require('stylus').middleware(__dirname + '/public')); 
app.use(express.static(path.join(__dirname, 'public'))); 
app.post('/handshake', setCookie ,handshake.token); 
http.createServer(app).listen(app.get('port'), function(){ 
    console.log('Express server listening on port ' + app.get('port')); 
}); 

試圖讓代碼更具可讀性引入了太多與我的代碼無關的拼寫錯誤。我採取了這樣的建議，並以下面的方式改變了代碼，但它仍然沒有向客戶端寫入cookie。

var express = require('express') 
    , routes = require('./routes') 
    , user = require('./routes/user') 
    , handshake = require('./routes/handshake') 
    , http = require('http') 
    , crypt = require('crypto') 
    , io = require('socket.io') 
    , db = require('levelup')('./mydb') 
    , path = require('path'); 

var app = express(); 
app.use(express.cookieParser()); 
app.use(express.bodyParser()); 

var cookieMiddleware = function (req, res, next) { 
    var cookie = req.cookies.user; 
    console.log("cookie_name" , cookie); 
    if (cookie === undefined) 
    { 
     // no: set a new cookie 
     var random = Math.random().toString(); 
     random=random.substring(2,random.length);  
     sessionToken = Date.now() + random; 
     salt = sessionToken + req.body.address; 
     sha2 = crypt.createHash('sha256'); 
     sha2.update(sessionToken); 
     var price = req.body.price; 
     var encryptedSession = sha2.digest('hex'); 

    console.log('post body',price); 
     res.cookie('user','price' , { maxAge: 100000 }); 
     console.log('existing cookies', req.cookies); 
    } 
    else 
    { 
     console.log('cookie exists', req.cookies); 
    } 
    next(); 
}; 
//development only 
if ('development' == app.get('env')) { 
app.use(express.errorHandler()); 
} 

app.set('port', process.env.PORT || 3000); 
app.set('views', __dirname + '/views'); 
app.set('view engine', 'jade'); 
app.use(express.logger('dev')); 
app.use(express.session({secret: "TheSuperSecretStringForHashing"})); 
app.use(express.methodOverride()); 
app.use(app.router); 
//app.use(express.favicon()); 
app.use(require('stylus').middleware(__dirname + '/public')); 
app.use(express.static(path.join(__dirname, 'public'))); 
app.post('/handshake', cookieMiddleware , handshake.token); 
app.get('/', routes.index); 
app.get('/users', user.list); 


var server = http.createServer(app).listen(app.get('port'), function(){ 
    console.log('Express server listening on port ' + app.get('port')); 
}); 

io = io.listen(server); 

io.sockets.on('connection', function (socket) { 
     socket.emit('news', { hello: 'world' }); 
     socket.on('my other event', function (data) { 
     console.log(data); 
     }); 
    }); 

的handshake.js處理器

exports.token = function(req, res){ 
    req.body.title = 'Payment Portal'; 
    res.render('payment_init', req.body); 
}; 

Answer 1

您正在檢查名爲cokkieName餅乾，但你設置cookie的名稱爲price。

嘗試改變這一到：

var cookie = req.cookies.price; 

cookie現在應該包含您的cookie的值。