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server.js
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server.js
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const http = require('http');
const url = require('url');
const ws = require('ws');
const wss = new ws.WebSocketServer({ noServer: true });
const PORT = process.env.PORT || 3000;
const HOSTNAME = 'localhost';
let clients = [];
let users = [
{
name: 'Yudha',
id: makeid(7),
},
{
name: 'Santhi',
id: makeid(7)
},
{
name: 'Laksmana',
id: makeid(7)
},
];
let chats = [
{
id: makeid(5),
user: users[1].name,
target: users[0].name,
message: 'Hi',
time: +new Date('2023-03-28 08:10:00'),
isRead: true,
},
{
id: makeid(5),
user: users[0].name,
target: users[1].name,
message: 'How are you?',
time: +new Date('2023-03-28 09:10:00'),
isRead: true,
},
];
setInterval(() => {
users = [
{
name: 'Yudha',
id: makeid(7),
},
{
name: 'Santhi',
id: makeid(7)
},
{
name: 'Laksmana',
id: makeid(7)
},
];
chats = [
{
id: makeid(5),
user: users[1].name,
target: users[0].name,
message: 'Hi',
time: +new Date('2023-03-28 08:10:00'),
isRead: true,
},
{
id: makeid(5),
user: users[0].name,
target: users[1].name,
message: 'How are you?',
time: +new Date('2023-03-28 09:10:00'),
isRead: true,
},
];
clients.forEach((client) => client.socket.close(1000, 'Time to reset'))
clients = [];
}, 10 * 60 * 1000);
function makeid(length) {
let result = '';
const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
const charactersLength = characters.length;
let counter = 0;
while (counter < length) {
result += characters.charAt(Math.floor(Math.random() * charactersLength));
counter += 1;
}
return result;
}
function debug(state) {
console.log('\n')
console.log(`[${state}]`);
console.log(clients.map(({ user, id }) => ({ user, id })));
console.log('=========================================')
console.log('\n')
}
function withThrottling(callback, delay = 0) {
setTimeout(() => {
callback()
}, delay);
}
function onSocketConnect(ws) {
ws.on('message', function (message) {
message = JSON.parse(message.toString());
// close all other connection related to user
let newClients = [];
for (let client of clients) {
if (client.user === message.user && client.id !== message.id) {
client.socket.close(1000, 'another connection are made.');
continue;
}
newClients.push(client);
}
// set new clients
clients = newClients;
// check if client change user
const client = clients.find((el) => el.id === message.id);
if (!client) {
// prepare data
const id = makeid(10);
// add user
clients = [...clients, {
user: message.user,
socket: ws,
id
}];
// send response
const data = {
status: 'success',
type: 'connect',
message: 'connection added',
data: {
user: message.user,
id
}
};
ws.send(JSON.stringify(data));
debug('connect-message');
return;
}
client.user = message.user;
client.socket = ws;
// send response
const data = {
status: 'success',
type: 'connect',
message: 'change user',
data: {
user: client.user,
id: client.id
}
}
client.socket.send(JSON.stringify(data));
debug('connect-message');
return;
});
ws.on('close', function (message) {
clients = clients.filter((client) => client.socket !== ws);
debug('connect-closed');
});
}
function onChat(ws) {
ws.on('message', function (message) {
message = JSON.parse(message.toString());
// check client still connected
let client = clients.find((el) => el.id === message.id);
if (!client) {
ws.close(1000, 'You are disconnected');
return;
};
const newChat = {
id: makeid(5),
user: message.user,
target: message.target,
time: message.time,
message: message.message,
isRead: false,
}
chats.push(newChat);
// get target client
let clientTarget = clients.find((el) => el.user == message.target);
// send to target
const data = {
status: 'success',
type: 'message',
message: '',
data: {
chat: newChat
}
}
if (clientTarget) clientTarget.socket.send(JSON.stringify({...data, message: 'received'}));
client.socket.send(JSON.stringify({...data, message: 'sent'}));
return;
});
ws.on('close', function () {
clients = clients.filter((client) => client.socket !== ws);
debug('chat-closed');
});
}
function writeHeaders(res) {
res.setHeader('Access-Control-Allow-Origin', '*');
res.setHeader('Access-Control-Allow-Methods', 'POST, GET');
}
const server = http.createServer((req, res) => {
writeHeaders(res);
let data = {};
const { pathname } = url.parse(req.url);
if (req.method == 'POST') {
let body = "";
switch (pathname) {
case '/users':
req.on('data', (chunk) => body += chunk);
req.on('end', () => {
try {
// get body
body = JSON.parse(body);
if (!body.user) throw new Error("No User Data Sent");
// check if user exists
const isUserExists = users.find((user) => user.name == body.user);
if (isUserExists) throw new Error("User Already Exists");
// add user
const user = {
name: body.user,
id: +new Date()
}
users.push(user);
// response
data = {
status: 'success',
message: 'Success Add User',
data: { user }
};
} catch (error) {
// response
data = {
status: 'fail',
message: error.message,
data: null
};
}
res.end(JSON.stringify(data));
});
break;
case '/chat-read':
req.on('data', (chunk) => body += chunk);
req.on('end', () => {
try {
body = JSON.parse(body);
const { chatIds } = body;
chatIds.forEach(id => {
let chat = chats.find((chat) => chat.id === id);
if (chat) chat.isRead = true;
});
// response
data = {
status: 'success',
message: 'Chat Read',
data: { chatIds }
};
} catch (error) {
// response
data = {
status: 'fail',
message: error.message,
data: null
};
}
res.end(JSON.stringify(data));
})
break;
default:
break;
}
}
if (req.method == 'GET') {
let body = "";
switch (pathname) {
case '/ws-connect':
if (!req.headers.upgrade || req.headers.upgrade.toLowerCase() != 'websocket') {
data = {
status: 'fail',
message: 'No Upgrade Data',
data: null,
}
res.end(JSON.stringify(data));
return;
}
if (!req.headers.connection.match(/\bupgrade\b/i)) {
data = {
status: 'fail',
message: 'No Connection Upgrade',
data: null,
}
res.end(JSON.stringify(data));
return;
}
withThrottling(() => {
wss.handleUpgrade(req, req.socket, Buffer.alloc(0), onSocketConnect);
});
break;
case '/ws-chat':
if (!req.headers.upgrade || req.headers.upgrade.toLowerCase() != 'websocket') {
data = {
status: 'fail',
message: 'No Upgrade Data',
data: null,
}
res.end(JSON.stringify(data));
return;
}
if (!req.headers.connection.match(/\bupgrade\b/i)) {
data = {
status: 'fail',
message: 'No Connection Upgrade',
data: null,
}
res.end(JSON.stringify(data));
return;
}
wss.handleUpgrade(req, req.socket, Buffer.alloc(0), onChat);
break;
case '/users':
data = {
status: 'success',
message: 'Success Get Users',
data: { users },
};
withThrottling(() => {
res.end(JSON.stringify(data));
});
break;
case '/chats':
req.on('data', (chunk) => body += chunk);
req.on('end', () => {
const queryParams = new URLSearchParams(url.parse(req.url).query);
const user = queryParams.get('user');
const target = queryParams.get('target');
const chatData = chats.filter((chat) =>
(chat.user === user && chat.target === target) ||
(chat.user === target && chat.target === user)
);
data = {
status: 'success',
message: 'Success Get Chats',
data: {
chats: chatData
},
};
withThrottling(() => {
res.end(JSON.stringify(data));
}, 0);
});
break;
case '/last-chats':
req.on('data', (chunk) => body += chunk);
req.on('end', () => {
const queryParams = new URLSearchParams(url.parse(req.url).query);
const forUser = queryParams.get('forUser');
const lastChats = users.map((user) => {
const lasts = chats.filter((chat) =>
(chat.user === forUser && chat.target === user.name) ||
(chat.user === user.name && chat.target === forUser)
);
const last = lasts.length > 0
? [lasts[lasts.length - 1]]
: []
return {
...user,
chats: last
}
});
data = {
status: 'success',
message: 'Success Get Last Chats',
data: {
lastChats
},
};
res.end(JSON.stringify(data));
});
break;
default:
data = {
status: 'fail',
message: 'Service Not Found',
data: null,
};
res.end(JSON.stringify(data));
break;
}
}
}).listen(PORT, '0.0.0.0', () => {
// console.log(`Server running on http://${HOSTNAME}:${PORT}`);
console.log(`server running on port ${PORT}`);
});