如何知道用户是否使用passport.js 登录? [英] How to know if user is logged in with passport.js?

问题描述

我已经阅读 passport.js 信息和示例两天了，但我不确定在那之后我完成了所有的身份验证过程.

I've been reading passport.js info and samples for two days, but I'm not sure after that I did all the process of authenticating.

我如何知道我是否已登录，例如，我将有一个带有登录或注销按钮的导航栏，是否有类似下面代码的变量?

How do I know if I'm logged in, for example, I'll have a navigation bar with a login or logout button, is there some variable like code below?

if (login)
   <button>logout</button>
else 
   <button>login</button>

推荐答案

如果用户已登录，passport.js 将在 req<中创建 user 对象/code> 用于 express.js 中的每个请求，您可以检查它是否存在于任何中间件中:

If user is logged in, passport.js will create user object in req for every request in express.js, which you can check for existence in any middleware:

if (req.user) {
    // logged in
} else {
    // not logged in
}

您可以为此创建简单的 express.js 中间件，它会检查用户是否已登录，如果没有 - 将重定向到 /login 页面:

You can create simple express.js middleware for that, that will check if user is logged in, and if not - will redirect to /login page:

function loggedIn(req, res, next) {
    if (req.user) {
        next();
    } else {
        res.redirect('/login');
    }
}

并使用它:

app.get('/orders', loggedIn, function(req, res, next) {
    // req.user - will exist
    // load user orders and render them
});

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