We have cut a good such an impressive progress in the Auth
concept, now we want to head back again to middleware, we want to create Global Middlewares
which will be applied to all the routes, or to specific routes.
Global Middlewares
Global middlewares concept is to apply one or more middlewares to all the routes, or to specific routes.
This will be very useful instead of adding same middleware to each route separately.
So let's see how this can be done.
How it works
We'll create a http.ts
config file in our config directory, it will be of course an object, we'll define a middlewares
property, and we'll set it to an array of middlewares.
// src/config/http.ts
const httpConfigurations = {
middleware: [
//
]
};
export default httpConfigurations;
Let's not forget to import this file in our index.ts
file.
// src/config/index.ts
import config from "@mongez/config";
import databaseConfigurations from "config/database";
import appConfigurations from "./app";
import authConfigurations from "./auth";
import httpConfigurations from "./http";
import validationConfigurations from "./validation";
config.set({
database: databaseConfigurations,
validation: validationConfigurations,
app: appConfigurations,
auth: authConfigurations,
http: httpConfigurations,
});
Now we're ready to the next step, registering the middlewares.
Registering the middlewares
We already have middlewares list for each route, now what we need to do is to merge the global middlewares with the route middlewares.
// src/core/http/request.ts
// ...
/**
* Execute middleware list of current route
*/
protected async executeMiddleware() {
if (!this.route.middleware || this.route.middleware.length === 0) return;
// trigger the executingMiddleware event
this.trigger("executingMiddleware", this.route.middleware, this.route);
for (const middleware of this.route.middleware) {
const output = await middleware(this, this.response);
if (output !== undefined) {
this.trigger("executedMiddleware");
return output;
}
}
// trigger the executedMiddleware event
this.trigger("executedMiddleware", this.route.middleware, this.route);
}
Here where we're going to merge the global middlewares with the route middlewares.
// src/core/http/request.ts
import config from "@mongez/config";
// ...
/**
* Execute middleware list of current route
*/
protected async executeMiddleware() {
// get route middlewares
const routeMiddlewares = this.route.middleware || [];
// get global middlewares
const globalMiddlewares = config.get("http.middleware", []);
// merge global and route middlewares
const middlewares = [...globalMiddlewares, ...routeMiddlewares];
// check if there are no middlewares, then return
if (middlewares.length === 0) return;
// trigger the executingMiddleware event
this.trigger("executingMiddleware", middlewares, this.route);
for (const middleware of middlewares) {
const output = await middleware(this, this.response);
if (output !== undefined) {
this.trigger("executedMiddleware");
return output;
}
}
// trigger the executedMiddleware event
this.trigger("executedMiddleware", middlewares, this.route);
}
We defined here the route middlewares first, then the global ones, and then we merged them together.
If there are no middlewares, then we exit the function using return
.
After that we w'll loop over merged middlewares, and execute them one by one.
🎨 Conclusion
We've learned how to create global middlewares, and how to merge them with the route middlewares.
In our next article, we'll improve the global middlewares concept, and we'll add more features to it, like adding exceptions for routes, using named routes and allowing middlewares for certain routes only.
☕♨️ Buy me a Coffee ♨️☕
If you enjoy my articles and see it useful to you, you may buy me a coffee, it will help me to keep going and keep creating more content.
🚀 Project Repository
You can find the latest updates of this project on Github
😍 Join our community
Join our community on Discord to get help and support (Node Js 2023 Channel).
🎞️ Video Course (Arabic Voice)
If you want to learn this course in video format, you can find it on Youtube, the course is in Arabic language.
📚 Bonus Content 📚
You may have a look at these articles, it will definitely boost your knowledge and productivity.
General Topics
- Event Driven Architecture: A Practical Guide in Javascript
- Best Practices For Case Styles: Camel, Pascal, Snake, and Kebab Case In Node And Javascript
- After 6 years of practicing MongoDB, Here are my thoughts on MongoDB vs MySQL
Packages & Libraries
- Collections: Your ultimate Javascript Arrays Manager
- Supportive Is: an elegant utility to check types of values in JavaScript
- Localization: An agnostic i18n package to manage localization in your project
React Js Packages
Courses (Articles)
Top comments (0)