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/*
* chat.js
* Copyright (c) 2019, Texx
* License: MIT
* See https://github.com/texxme/Texx/blob/master/LICENSE
*/
// general imports
const $ = require('jquery');
const crypto = require('crypto');
const encryption = require('./encryption');
const wordList = require('./wordlist');
const pinInput = require('./input_pin');
const swal = require('sweetalert');
const xkcdPassword = require('xkcd-password');
// setup vars
const host = '127.0.0.1';
let peerId, call, passphrase, connectedPeer;
let connectedPeers = []; // TODO: Save new peers in array
// setup generator
const generator = new xkcdPassword();
generator.initWithWordList(wordList);
/**
* Sets up encryption, user etc.
*/
(async () => {
// generate peerId
if (localStorage.getItem('peer_id') === null) {
peerId = await generator.generate().then(words => words.join('-'));
localStorage.setItem('peer_id', peerId);
} else
peerId = localStorage.getItem('peer_id');
encryption.setup();
await evaluateKeyGeneration();
})();
/**
* Evaluates whether a key generation is needed and initializes regarding actions
* @returns {Promise<void>}
*/
async function evaluateKeyGeneration() {
if (localStorage.getItem('database') === 'success' && await encryption.check()) {
pinInput.init(async (pin, tryCount) => {
try {
if (await encryption.getId(await encryption.getPublic()) !== peerId) throw "Not verified!";
passphrase = new Buffer(crypto.createHmac('SHA256', pin).update(pin).digest('hex')).toString('base64');
await encryption.decryptPrivate(await encryption.getPrivate(), passphrase);
chat()
} catch (e) { // decrypting failed
if (tryCount === 3) {
encryption.reset();
console.error('Too many tries!');
pinInput.failure('This account got removed, the site will reload.');
setTimeout(() => location.reload(true), 1500)
} else if (e === 'Not verified!') {
console.error(e);
pinInput.failure(e);
} else {
console.error('Passphrase is wrong!');
pinInput.failure('Passphrase is wrong!');
}
}
});
} else {
pinInput.init(pin => {
console.log('[LOG] No existing keys found! Generating...');
pinInput.generate();
passphrase = new Buffer(crypto.createHmac('SHA256', pin).update(pin).digest('hex')).toString('base64');
(async () => await encryption.generate(peerId, passphrase).then(() => chat()))()
});
}
}
/**
* Initializes chat functions
*/
function chat() {
// hide pin input and display chat
$('#enter_pin').hide();
$('#chat').fadeIn();
// start the peer
const peer = new Peer(peerId, {host: host, port: 8080, path: '/api', debug: 0});
// Peer events
peer.on('open', id => {
console.log('[LOG] Your ID is', id);
swal('Hello world!', 'Your ID is "' + id + '".\nYou can share this ID with your friends so they can chat with you!', 'success')
});
peer.on('error', err => console.error(err));
peer.on('call', call => getMediaStream(stream => call.answer(stream))); // TODO: Ask for call accept
peer.on('connection', async conn => {
connectedPeer = conn;
console.log('[LOG] Connected with', connectedPeer.peer);
swal('New connection!', `You have successfully connected to the user ${connectedPeer.peer}!`, 'success');
encryption.getMsgs(connectedPeer.peer, await encryption.get(connectedPeer.peer), await encryption.getPrivate(), passphrase).then(messages =>
messages.forEach(async data => await receivedMessage(`${data.message} - ${data.time}`, true))
);
connectedPeer.on('open', async () => transferKey(await encryption.getPublic()));
connectedPeer.on('data', async message => {
console.log('[LOG] Received new message!');
await receivedMessage(message);
})
});
/**
* Connects to a peer via his id
* @param id
* @returns {Promise<void>}
*/
async function connect(id) {
const connectionId = (await generator.generate()).join('-');
console.log('[LOG] Connecting to', id);
console.log('[LOG] Your connection ID is', connectionId);
connectedPeer = peer.connect(id, {label: connectionId, reliable: true});
console.log('[LOG] Connected with', connectedPeer.peer);
encryption.getMsgs(connectedPeer.peer, await encryption.get(connectedPeer.peer), await encryption.getPrivate(), passphrase).then(messages =>
messages.forEach(async data => await receivedMessage(`${data.message} - ${data.time}`, true))
);
connectedPeer.on('open', async () => transferKey(await encryption.getPublic()));
connectedPeer.on('data', async message => {
console.log('[LOG] Received new message!');
await receivedMessage(message);
})
}
/**
* Sends a message to the peer with which you're currently connected
* @param message
* @returns {Promise<void>}
*/
async function sendMessage(message) {
console.log(`[LOG] Sending message '${message}' to ${connectedPeer.peer}`);
connectedPeer.send({
type: 'text',
data: await encryption.encrypt(message, await encryption.get(connectedPeer.peer), await encryption.getPrivate(), passphrase)
});
await receivedMessage(message, true);
}
/**
* Transfers the (public) key to the currently connected peer
* @param key
*/
function transferKey(key) {
console.log(`[LOG] Transferring key to ${connectedPeer.peer}`);
connectedPeer.send({type: 'key', data: key});
}
/**
* Renders and processes the incoming messages
* @param message
* @param self
*/
async function receivedMessage(message, self = false) {
if (self) {
$('#messages').append(`<span style="color: green">${message}</span><br>`);
} else {
if (message.type === 'text') {
await encryption.storeMsg(connectedPeer.peer, message.data, passphrase);
await encryption.decrypt(message.data, await encryption.get(connectedPeer.peer), await encryption.getPrivate(), passphrase)
.then(plaintext => $('#messages').append(`${plaintext}<br>`));
} else if (message.type === 'key') {
await encryption.store(connectedPeer.peer, message.data)
}
}
}
/**
* Sends a message of the text input field
* @returns {Promise<void>}
*/
async function sendMessageFromInput() {
return await sendMessage($('#message').val()) & $('#message').val('')
}
/*+
* Shows warning message and deleted account
*/
function deleteAccount() {
swal({
title: 'Are you sure?',
text: 'Once deleted, you will not be able to recover any messages or connections!',
icon: 'warning',
buttons: true,
dangerMode: true,
}).then(willDelete => {
if (willDelete) {
encryption.reset();
swal('Successfully deleted your data.', '', 'success').then(() => location.reload(true));
}
});
}
/**
* Click events
*/
$(document).ready(() => {
$('#send_message').on('click', async () => await sendMessageFromInput());
$('#message').on('keydown', async e => {
if (e.key === 'Enter') await sendMessageFromInput()
});
// FABs
$('#logout').on('click', () => location.reload(true));
$('#delete').on('click', () => deleteAccount());
$('#call').on('click', () => getMediaStream(stream => {
call = peer.call(peerId, stream); // TODO: Encrypt call
initCall(call)
}));
$('#add_contact').on('click', () => {
swal('Add a contact', {
content: 'input',
attributes: {
placeholder: 'Contact ID',
},
}).then(contactId => connect(contactId).then(() =>
swal(`Successfully connected to "${contactId}"`, '', 'success')
));
})
});
}
function getMediaStream(callback) {
navigator.getUserMedia(
{audio: true, video: {width: 1280, height: 720}},
stream => callback(stream),
err => console.error(err)
)
}
function initCall(call) {
call.on('stream', stream => {
const video = document.querySelector('video');
video.srcObject = stream;
video.onloadedmetadata = () => {
video.play();
};
})
}
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