server.js

var readline = require('readline');
var path = require('path');
var fs = require('fs');
var watch = require('node-watch');
var https = require('https');
var socket = require("socket.io");

//setup certificates
var privateKey  = "-----BEGIN RSA PRIVATE KEY-----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\nE7TA+f7UQ0I/nwN7zLG8tKiT9yqCxaLEUOnauxQc1KU=\n-----END RSA PRIVATE KEY-----"
var certificate = "-----BEGIN CERTIFICATE-----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\nfoW7kf5paa3WvsZAJa2yn70J1QnC7xrJxkUB8JA3T6w4xY+GUw==\n-----END CERTIFICATE-----\n";

var credentials = {key: privateKey, cert: certificate};

//setup readline
const rl = readline.createInterface({
	input: process.stdin,
	output: process.stdout
});

//var usableFileEndings = "none";
var config = {}

function AskUsedLanguage(){
	rl.question("What language do you code in? (possible options: py/cs/js/java) ", (answer) => {
		if(answer === "py" || answer === "cs" || answer === "js" || answer === "java"){
			//write new config
			config = {language: answer}
			fs.writeFileSync("./config.json", JSON.stringify(config), {flag: "w"})

			StartServer()
		}else{
			console.log("That is not a correct language/file ending!");
			AskUsedLanguage();
		}
	})
}

//Starting basic HTTPS server (socket.io server isn't started yet, it starts in StartServer)

var app = require('express')(); //launch express

var httpsServer = https.createServer(credentials, app);

httpsServer.listen(50000);

if(fs.existsSync("./config.json")){
	config = JSON.parse(fs.readFileSync("./config.json"))

	StartServer();
}else{
	console.log("No 'config.json' file detected! Entering first time setup...");
	AskUsedLanguage();
}

//Force https
app.use(function(req, res, next) {
	if(!req.secure) {
		return res.redirect(['https://', req.get('Host'), req.url].join(''));
	}
	next();
});

app.get("/", function(req, res){
	res.sendFile(__dirname + "/index.html")
})

function StartServer(){
	console.log("Using language '" + config.language + "' files")

	var watcher = watch(".", {recursive: true})

	var walkSync = function(dir, fileEnding, filelist) {
		var path = path || require('path');
		var fs = fs || require('fs'),
			files = fs.readdirSync(dir);
		filelist = filelist || [];
		files.forEach(function(file) {
			if (fs.statSync(path.join(dir, file)).isDirectory()) {
				filelist = walkSync(path.join(dir, file), fileEnding, filelist);
			}
			else {
				if(file.endsWith(fileEnding)){
					filelist.push(path.join(dir, file));
				}
			}
		});
		return filelist;
	};

	function UploadFiles(){
		var filesData = {}

		var allFilePaths = walkSync("./", `.${config.language}`)
		allFilePaths.forEach(function(filePath){
			var fileName = path.basename(filePath)
			if(!fileName.startsWith("TemporaryGeneratedFile_") && fileName !== "AssemblyInfo.cs"){
				filesData[fileName] = fs.readFileSync(filePath, 'utf8')
			}
		})

		io.emit("upLoadDir", filesData)
	}

	var currentId;
	var enableFileWatcher = true;

	watcher.on("change", function(event, filename){
		if(enableFileWatcher && filename.endsWith(`.${config.language}`)){
			//if the user is still connected
			console.log("Detected file change, uploading to webkit...");

			UploadFiles()
			
			enableFileWatcher = false;

			setTimeout(function(){
				enableFileWatcher = true
			}, 500)
		}
	})
	
	var io = socket(httpsServer)

	io.on("connection", function(socket){
		//console.log("a user connected")

		var madeAllowDownloadDecision = false;
		var allowDownload = false;

		currentId = socket.id
		
		//emit to user the current dir
		io.emit("showDirs", {dirs: ["Source (location of the .exe)"]})

		//emit the config data
		io.emit("GetConfig", config);

		//if the web client has set a new language
		socket.on("SetLanguage", function(data){
			config.language = data;
			fs.writeFileSync("./config.json", JSON.stringify(config), {flag: "w"})

			console.log("Now using language '" + config.language + "' files")
		})

		//once the user confirms the dir he chose, we send it back to him
		socket.on("dirWasSet", function(data){
			//io.sockets.connected[currentId].emit("dirWasSet", {dirName: [JSON.parse(data).dirName]})
			io.emit("dirWasSet", {dirName: [JSON.parse(data).dirName]})
		})

		//here the user chooses whether to upload or download the code, we handle these events
		//user wants to upload files from the working station to the webkit
		socket.on("upLoadDir", function(data){
			if(!madeAllowDownloadDecision){
				madeAllowDownloadDecision = true;
				allowDownload = false;
			}

			UploadFiles()
		})

		//user wants to download files from the webkit to our working station
		socket.on("downLoadDir", function(data){
			if(!madeAllowDownloadDecision){
				madeAllowDownloadDecision = true;
				allowDownload = true;
			}

			//console.log(`got downLoadDir, allowDownload = ${allowDownload}`);
			if(madeAllowDownloadDecision && allowDownload){
				data = JSON.parse(data)

				Object.keys(data).forEach(function(key) {
					var val = data[key];
					
					fs.appendFileSync("./" + key, val, {flag: "w"})
				});
			}
		})
	})
}