Real-Time Secure Chat Application using Web Sockets

• The real-time implementation of this Chat application is done using Web Sockets development technique.
• For End-to-end Encryption, I have made use of the Signal Protocol at the client side. Refer the link mentioned below for the Client Application.

Technology Stack

• NodeJS
• Express
• TypeScript
• MongoDB
• Web Sockets

Web Sockets (Push Server) as a Service

• HTTP protocol upgrade to websocket (101 status code)

import * as http from ‘http’

export default class WebSockets {
   	public static wsServer: any
   		  static init(server: http.Server): void {
       		const WebSocketServer = require("websocket").server
         this.wsServer = new WebSocketServer({
              "httpServer": server
         })
    }
}

• Sending and Receiving of Messages to/from my Client Application build in React

wsServer.on(‘request',request => {
   const connection = request.accept(null, request.origin);

   connection.on(‘message’, message => {
     console.log('Received Message:', message.utf8Data);
     connection.sendUTF('Hi this is WebSocket server!');
   });
   
   connection.on('close',(reasonCode, description) => {
       console.log('Client has disconnected.');
   });
});

Add ons

• Apidoc integrated for better api documentation
• Dummy cron job
• Dummy controller, router, models configured.
• Basic JWT setup.
• Development and production environment setup for easy of use

Resources

• Writing WebSocket Servers
• TypeScript
• Express

PRs and issues are most welcome