server.js

const express = require("express");
const http = require("http");
const path = require("path");
const app = express();
const server = http.createServer(app);
const socket = require("socket.io");
const io = socket(server);

const users = {};

io.on("connection", (socket) => {
	if (!users[socket.id]) {
		users[socket.id] = socket.id;
	}
	socket.emit("yourID", socket.id);
	io.sockets.emit("allUsers", users);
	socket.on("disconnect", () => {
		delete users[socket.id];
	});

	socket.on("message", (data) => {
		io.to(data.to).emit("message", data.message);
	});

	socket.on("callUser", (data) => {
		io.to(data.userToCall).emit("hey", {
			signal: data.signalData,
			from: data.from,
		});
	});

	socket.on("acceptCall", (data) => {
		io.to(data.to).emit("callAccepted", data.signal);
	});

	socket.on("declineCall", (data) => {
		io.to(data.to).emit("callDeclined");
	});

	socket.on("cancelCall", (data) => {
		io.to(data.to).emit("callCancelled");
	});
});

if (process.env.NODE_ENV === "production") {
	/*
	 * Redirect user to https if requested on http
	 *
	 * Refer this for explaination:
	 * https://www.tonyerwin.com/2014/09/redirecting-http-to-https-with-nodejs.html
	 */
	app.enable("trust proxy");
	app.use((req, res, next) => {
		// console.log('secure check');
		if (req.secure) {
			// console.log('secure');
			// request was via https, so do no special handling
			next();
		} else {
			//
			// request was via http, so redirect to https
			res.redirect(`https://${req.headers.host}${req.url}`);
		}
	});
}

if (process.env.NODE_ENV === "production") {
	// Set static folder
	app.use(express.static(path.join(__dirname, "./client/build/")));

	app.get("*", (req, res) => {
		res.sendFile(path.join(__dirname, "./client/build/index.html"));
	});
}

server.listen(process.env.PORT || 8000, () =>
	console.log(`Server is running on port ${process.env.PORT || 8000}`)
);