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const http = require("http");
const fs = require("fs");
const path = require("path");
const url = require("url");
const websocket = require("ws");
const static_content = __dirname + "/dist/";
// Create an array to store messages in
var log = []
// Initialise a simple http server to serve any static files
http.createServer((req, res) => {
// normalise path name to stay within a normal directory
var requestUrl = url.parse(req.url);
var fsPath = static_content + path.normalize(requestUrl.pathname);
// automatically return the index of a directory, if its been selected
if (fs.statSync(fsPath).isDirectory())
fsPath += fsPath.endsWith("/") ? "index.html" : "/index.html";
// read and send the file
fs.readFile(fsPath, (err, data) => {
if (err) {
res.writeHead(404);
res.end(JSON.stringify(err))
} else {
res.writeHead(200);
res.end(data);
}
});
}).listen(8080);
// create websocket: client tracking allows us to get a set of clients so that we can send messages to each client once they appear
const wss = new websocket.Server({port : 8081, clientTracking: true});
wss.on("connection", ws => {
// predefine a user nickname
var nick = "anon" + wss.clients.size
ws.on("message", msg => {
var data = JSON.parse(msg);
// Ensure that nickname requirements are met before setting client's nick
if (data.nickname && data.nickname.length < 24 && data.nickname.length > 0) nick = data.nickname;
switch data.event {
case "join":
// send the client the requested number of messages before joining
if (data.lines) log.slice(0-data.lines).forEach(l => ws.send(l))
break;
case "message":
// ensure that the message length requirements are met correctly
if (data.content.length < 128 && data.content.length > 0) {
// recreate the message object to be sent
message = JSON.stringify({
event: "message",
content: data.content,
nickname: nick
});
// send the message to the log array first
log.push(message);
// propogate the message to all connected clients
wss.clients.forEach(c => {
c.send(message);
})
}
break;
}
});
})
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