了解Passportjs自定义回调 [英] Understanding Passportjs Custom Callback

问题描述

我正在尝试使用Passportjs并且自定义回调的代码是：

I'm experimenting with Passportjs and the code for a Custom Callback is:

app.get('/login', function(req, res, next) {
  passport.authenticate('local', function(err, user, info) {
    if (err) { return next(err); }
    if (!user) { return res.redirect('/login'); }
    req.logIn(user, function(err) {
      if (err) { return next(err); }
      return res.redirect('/users/' + user.username);
    });
  })(req, res, next);
});

我对所有这些代码感到满意，除了倒数第二行（req，res，next）; - 有人可以解释为什么在最后添加这些参数。这可能是一个JS问题，而不是Passport问题，但是非常感谢任何帮助。

I'm happy with all of this code except for the second to last line (req, res, next); - Could someone explain why these parameters are added on the end. This is probably more of a JS question than a Passport question but any help is much appreciated.

推荐答案

javascript答案是它返回一个用第二组参数再次调用的函数。

The "javascript" answer is that it returns a function which is called again with those 2nd set of arguments.

该函数是链中每个策略失败的累加器。

That function is the "accumulator for failures from each strategy in the chain".

https://github.com/jaredhanson/passport/blob/master/lib/middleware /authenticate.js

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