如何拦截 node.js 快递请求
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How to intercept node.js express request
提问by Ryan Olds
In express, I have defined some routes
在快递中，我定义了一些路线
app.post("/api/v1/client", Client.create);
app.get("/api/v1/client", Client.get);
...
I have defined how to handle requests inside a Client controller. Is there a way that I can do some pre-processing to the requests, before handling them in my controller? I specifically want to check if the API caller is authorized to access the route, using the notion of access levels. Any advice would be appreciated.
我已经定义了如何处理客户端控制器内的请求。在我的控制器中处理请求之前，有没有办法对请求进行一些预处理？我特别想使用访问级别的概念检查 API 调用者是否有权访问路由。任何意见，将不胜感激。
回答by Ryan Olds
You can do what you need in a couple of ways.
您可以通过多种方式完成所需的操作。
This will place a middleware that will be used before hitting the router. Make sure the router is added with app.use()after. Middleware order is important.
这将放置一个将在访问路由器之前使用的中间件。确保路由器添加app.use()后。中间件顺序很重要。
app.use(function(req, res, next) {
// Put some preprocessing here.
next();
});
app.use(app.router);
You can also use a route middleware.
您还可以使用路由中间件。
var someFunction = function(req, res, next) {
// Put the preprocessing here.
next();
};
app.post("/api/v1/client", someFunction, Client.create);
This will do a preprocessing step for that route.
这将为该路线执行预处理步骤。
Note: Make sure your app.use()invokes are before your route definitions. Defining a route automatically adds app.router to the middleware chain, which may put it ahead of the user defined middleware.
注意：确保您的app.use()调用位于路由定义之前。定义路由会自动将 app.router 添加到中间件链中，这可能会将其置于用户定义的中间件之前。
