我可以通过 express next() 函数发送数据吗? [英] Can I send data via express next() function?

问题描述

我正在开发一个需要使用 express 进行身份验证过程和会话管理的网络应用程序.我已经完成了后端会话的工作.现在我想在 UI 上显示登录的用户.privateContent 是一个验证是否有人登录的功能，如下所示:

I'm working on a webapp that requires atuhentication process and session management with express. I've done with the backend sessions stuff. Now i want to show on the UI the user who is signed in. privateContent is a function that verify if someone is logged in, Like so:

...
app.get( '/authRequired', queries.privateContent , routes.tasks );
...

这是查询.privateContent:

Here is queries.privateContent:

...
exports.privateContent = function ( req, res, next ) {
  if ( req.session.user ) {
    var username = req.session.user.username;
    User.findOne( { 'username': username }, function ( err, obj ) {
      if ( true ) {
        next();
      } else {
        res.redirect('/');
      }
    });
  } else {
    res.redirect('/');
  }
};
...

我想知道的是:我能像这样发送数据吗?:

What i want to know is: Am i able to send data like this? :

...
next( username );
...

如果是这样，我如何在routes.tasks呈现时检索它，如果发生如下情况(我试图在下面的代码中获取数据，但它不起作用.):

if so, how can i retrieve it when routes.tasks render, if that happens as follows (i'm trying to get the data in the code below, but it does not work.):

...
exports.my_tasks = function ( req, res, data ) {
      console.log(data);
      res.render('tasks/tasks',
                  { title: 'Paraíso', controller: 'MyTasksController', user: data });
};
...

如您所料，我的意图是通过 next 传递登录到路由模块的当前用户，因此我可以使用 jade 在 UI 中打印用户名.谢谢您的帮助.:)

As you can guess, my intentions are to pass via next the current user who is signed in to the routing modules, so i can print the username in the UI using jade. Thank you for your help. :)

推荐答案

在这种情况下，您有几个选择(只使用其中之一！):

In this case you have a few options (only use one of these!):

1. 您可以从 my_tasks 路由访问 req.session.user.username 变量
2. 您可以使用res.locals
3. 您可以向req对象添加数据

1. You can just access the req.session.user.username variable from your my_tasks route
2. You can use res.locals
3. You can add data to the req object

在您的exports.privateContent 函数中，一旦在数据库中找到用户，您只需将该数据添加到res.locals:

In your exports.privateContent function, once a user is found in the database, you can simply add that data to the res.locals:

User.findOne( { 'username': username }, function ( err, obj ) {
  if ( true ) {
    // this variable will be available directly by the view
    res.locals.user = obj;

    // this will be added to the request object
    req.user = obj;

    next();
  } else {
    res.redirect('/');
  }
});

然后在您的exports.my_tasks 路由中，res.locals.user 将是中间件中的任何obj.然后，您可以在视图中以变量 user 的形式简单地访问它.

Then in your exports.my_tasks route, res.locals.user will be whatever obj was in the middleware. You can then simply access that in the view as the variable user.

因此，总的来说，您可以通过以下方式访问路线中的数据:

So, all together, you can access the data in your route in these ways:

exports.my_tasks = function ( req, res ) {
   res.render('tasks/tasks', {
     userFromReq: req.user, // this exists because you added in the middleware
     userFromSession: req.session.user, // this was already in the session, so you can access
     userFromRes: [DO NOT NEED TO DO THIS] // because res.locals are sent straight to the view (Jade).
   });
};

这篇关于我可以通过 express next() 函数发送数据吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！