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index.js
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index.js
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const ws = require('ws');
const express = require('express');
const cors = require('cors');
const utils = require('./utils');
const { v4: uuidv4 } = require('uuid');
const PORT = process.env.PORT || 8080;
const clients = new Set();
const app = express();
app.use(cors());
const server = app.listen(PORT, () => console.log(`Listening on ${PORT}`));
const wss = new ws.Server({ server });
const attachMessageId = (parsedMessage) => {
const messageUuid = uuidv4();
const targetMessage = {
id: messageUuid,
...parsedMessage
};
return targetMessage;
};
const getActiveUsers = () => [...clients]
.map(utils.formatClient);
const getClient = username => [...clients].find(client => client.username === username);
const getUser = (username) => {
const client = getClient(username);
if (client) {
return utils.formatClient(client);
}
return null
};
const onConnect = (ws) => {
let currentClient = null;
const broadcastMessage = (message) => {
[...clients]
.filter(client => client.socket !== ws)
.forEach(client => client.socket.send(message));
};
console.log("New client: " + ws);
ws.send(JSON.stringify({
type: 'users-list',
users: getActiveUsers()
}));
ws.on('message', (rawMessage) => {
const parsedMessage = JSON.parse(rawMessage);
const username = parsedMessage.username;
switch (parsedMessage.type) {
case 'message':
const targetMessage = attachMessageId(parsedMessage);
const targetMessageString = JSON.stringify(targetMessage);
broadcastMessage(targetMessageString);
break;
case 'user-connect':
const existingClient = getClient(username);
let broadcastMessageType;
if (!existingClient) {
userId = uuidv4();
currentClient = {
username,
userId,
};
clients.add(currentClient);
broadcastMessageType = 'user-joined';
}
else {
currentClient = getClient(username);
broadcastMessageType = 'user-status-change';
}
currentClient.socket = ws;
currentClient.status = 'online'
broadcastMessage(JSON.stringify({
type: broadcastMessageType,
...utils.formatClient(currentClient)
}));
break;
case 'user-status-change':
const { status } = parsedMessage;
currentClient.status = status;
broadcastMessage(JSON.stringify({
type: 'user-status-change',
...utils.formatClient(currentClient)
}));
break;
default:
break;
}
});
ws.on('close', () => {
console.log(ws + ' closed');
currentClient.status = 'offline';
broadcastMessage(JSON.stringify({
type: 'user-status-change',
status: 'offline',
...utils.formatClient(currentClient)
}));
})
};
wss.on('connection', onConnect);
app.get('/users', (req, res) => res.send([...clients].map(utils.formatClient)));
app.get('/user/:username', (req, res) => {
const user = getUser(req.params.username);
if (user) {
res.send(user);
}
else {
res.status(404).send('User not found');
}
});