Added comments to src/client.js src/index.js

Added more comments.
Changed '/login' post to check if the data isn't null

src/index.js

@@ -6,11 +6,14 @@ const WebSocket = require('ws');
 const app = express();
 const server = require('http').createServer(app);
 
+// creating the server web socket
 const wss = new WebSocket.Server({
 	server: server
 });
+// importing settings from settings.json
 const settings = JSON.parse(fs.readFileSync("settings.json"));
 
+// server variables and video state
 const THRESH_IGNORANCE = 250;
 let users_amount = 0;
 let unique_id = 0;
@@ -23,17 +26,20 @@ let state = {
 };
 
 wss.on('connection', function connection(ws) {
+	// on connection from client send update
 	users_amount += 1;
 	console.log('A new client Connected. Amount of users: ', users_amount);
 	state.client_uid = unique_id;
 	unique_id += 1;
 	ws.send(`state_update_from_server ${JSON.stringify(state)}`);
 
+	// log web socket error
 	ws.on('error', console.error);
 
 	ws.on('message', function message(data) {
 		data = data.toString();
 
+		// syncing requests from the client
 		if (data.startsWith("time_sync_request_backward")) {
 			ws.send(`time_sync_response_backward ${get_time()}`);
 		}
@@ -41,15 +47,18 @@ wss.on('connection', function connection(ws) {
 			let client_time = Number(data.slice("time_sync_request_forward".length + 1));
 			ws.send(`time_sync_response_forward ${get_time() - client_time}`);
 		}
+		// video state update from client. Update state and broadcast to all users
 		if (data.startsWith("state_update_from_client")) {
 			let new_state = JSON.parse(data.slice("state_update_from_client".length + 1));
 			let too_soon = (get_time() - state.last_updated) < THRESH_IGNORANCE;
 			let other_ip = (new_state.client_uid != state.client_uid);
 			let stale = (new_state.last_updated < state.last_updated)
 
+			// checking if we should update, in order not to update too much
 			if (!stale && !(too_soon && other_ip)) {
 				state = new_state;
-
+				
+				// broadcasting to all other clients the new state
 				wss.clients.forEach(function each(client) {
 					if (client !== ws && client.readyState === WebSocket.OPEN) {
 						client.send(`state_update_from_server ${JSON.stringify(state)}`);
@@ -59,6 +68,7 @@ wss.on('connection', function connection(ws) {
 		}
 	});
 
+	// client disconnect
 	ws.on('close', function close() {
 		users_amount -= 1;
 		console.log('Client diconnected. Amount of users: ', users_amount);
@@ -66,6 +76,10 @@ wss.on('connection', function connection(ws) {
 
 });
 
+
+////  Web server  ////
+
+// app settings
 app.use('/', express.static(__dirname));
 app.use(bodyParser.urlencoded({
 	extended: true
@@ -78,6 +92,8 @@ app.use(session({
 	logged: false
 }));
 
+
+// home page
 app.get("/", function (req, res) {
 	if (req.session.logged)
 		res.sendFile(__dirname + "/main.html");
@@ -85,19 +101,26 @@ app.get("/", function (req, res) {
 		res.sendFile(__dirname + "/login.html");
 });
 
+
+// receive login info
 app.post("/login", function (req, res) {
 	const data = req.body;
 	if (!data)
 		res.sendStatus(400);
-
-	if (data.password == settings.password)
-		req.session.logged = true;
 	else
-		req.session.logged = false;
+	{
+		if (data.password == settings.password)
+			req.session.logged = true;
+		else
+			req.session.logged = false;
+	
+		res.redirect("/");
+	}
 
-	res.redirect("/");
 });
 
+
+// video streaming
 app.get("/video", function (req, res) {
 	// Ensure there is a range given for the video
 	const range = req.headers.range;
@@ -109,13 +132,13 @@ app.get("/video", function (req, res) {
 	const videoPath = settings.video_path;
 	const videoSize = fs.statSync(videoPath).size;
 
-	// Parse Range
+	// parse Range
 	// Example: "bytes=32324-"
 	const CHUNK_SIZE = 10 ** 6; // 1MB
 	const start = Number(range.replace(/\D/g, ""));
 	const end = Math.min(start + CHUNK_SIZE, videoSize - 1);
 
-	// Create headers
+	// create headers
 	const contentLength = end - start + 1;
 	const headers = {
 		"Content-Range": `bytes ${start}-${end}/${videoSize}`,
@@ -133,14 +156,17 @@ app.get("/video", function (req, res) {
 		end
 	});
 
-	// Stream the video chunk to the client
+	// stream the video chunk to the client
 	videoStream.pipe(res);
 });
 
+
+// host server on given ip and port
 server.listen(settings.server_port, settings.server_ip,
 	() => console.log(`Server started at ${settings.server_ip}:${settings.server_port}`));
 
 
+// function to get the current time
 function get_time() {
 	let d = new Date();
 	return d.getTime();