javascript - 如何重写 Node.js 模块中的函数？

Question

我正在使用以下模块:

https://github.com/AdamPflug/express-brute

文档说:

There are some built-in callbacks that come with BruteExpress that handle some common use cases.

ExpressBrute.FailTooManyRequests Terminates the request and responses with a 429 (Too Many Requests) error that has a Retry-After header and a JSON error message.

源代码:

https://github.com/AdamPflug/express-brute/blob/36ddf21d0989f337a6b95cd8c945a66e32745597/index.js

定义以下内容:

ExpressBrute.FailTooManyRequests = function (req, res, next, nextValidRequestDate) {
    setRetryAfter(res, nextValidRequestDate);
    res.status(429);
    res.send({error: {text: "Too many requests in this time frame.", nextValidRequestDate: nextValidRequestDate}});
};

如何覆盖该函数以使其执行我想做的事情？特别是，我不想使用 res.send 发送 JSON 消息，而是使用 res.render 来显示一些 HTML。

Answer 1

这有点棘手，但可以重写该方法并保留对旧方法的引用，以便它也可以运行:

 { // scope to keep old private
   const old = ExpressBrute.FailTooManyRequests;
   ExpressBrute.FailTooManyRequests = function (req, res, next, nextValidRequestDate) {
      // Call the old one but replace res with a fake response
      old(req, { send() {}, status() {} }, next, nextValidRequestData);
      res.json({ what: "ever!" });
  };
}