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<!DOCTYPE html>
<html lang="fr">
<head>
<title>Serverless, secure & persistent multichat</title>
<!-- To efficiently implement sockets -->
<script src="https://unpkg.com/peerjs@1.2.0/dist/peerjs.min.js"></script>
<!-- To easily manage dynamic rendering -->
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<!-- Integrate font styles -->
<link href="https://fonts.googleapis.com/css2?family=Red+Hat+Display&display=swap" rel="stylesheet">
<!-- Material Design stylesheets -->
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/css/materialize.min.css">
<script async src="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/js/materialize.min.js"></script>
<style>
body {
font-family: "Red Hat Display";
background-color: #ecf0f1;
}
div {
text-align: center;
}
p {
margin: 0.18em;
}
#chatbox {
height: 25rem;
text-align: left;
width: 95%;
margin: 0 auto;
overflow-y: scroll;
}
.row {
width: 100%;
margin: 0;
padding: 0 2em;
}
</style>
</head>
<body>
<div id="app">
<div id="login" v-if="screen === 'login'">
<div class="container">
<h1>Enter your username</h1>
<div class="row">
<form v-on:submit="submitLogin">
<div class="input-field col s8">
<input :disabled="loading" id="username" type="text" v-model="usernameInput" />
<label for="username">My username</label>
</div>
<button v-bind:class="{ disabled: loading }" class="btn-large waves-effect waves-light red col s4" type="submit">
Login<i class="material-icons right">login</i>
</button>
</form>
</div>
<p v-if="loading">Loading...</p>
<p v-if="peerError" style="color: red">{{ peerError }}</p>
<p>Crafted with ❤ <em>by <a href="https://r.milon.pro" target="_blank" rel="noopener noreferrer">Rubilmax</a></em></p>
</div>
</div>
<div id="chat" v-if="screen === 'chat'">
<div class="container">
<h1>Multichat</h1>
<p>Crafted with ❤ <em>by <a href="https://r.milon.pro" target="_blank" rel="noopener noreferrer">Rubilmax</a></em></p>
<p>Your username: {{ usernameInput }}</p>
</div>
<div class="row">
<div id="users" class="col s12 m5">
<div class="row">
<!-- We don't show connection form if the client is disconnected -->
<div v-if="!peer.disconnected">
<form v-on:submit="submitConnection">
<div class="input-field col s8">
<input :disabled="loading" id="target_id" type="text" v-model="targetIdInput" />
<label for="target_id">Target username</label>
</div>
<button v-bind:class="{ disabled: loading }" class="btn-large waves-effect waves-light col s4" type="submit">
Connect<i class="material-icons right">login</i>
</button>
</form>
<button class="btn-large waves-effect waves-light red col s12" v-on:click="disconnectPeer">
Disconnect from server<i class="material-icons right">logout</i>
</button>
<div class="col s12">
<em v-if="peerError" style="color: red">{{ peerError }}</em>
</div>
</div>
<div v-else class="container">
<h5>You are disconnected!</h5>
<em>You can still talk to connected users, but won't be able to reach or be reached by any new user!</em>
</div>
<div class="col s12">
<h4>Connected users</h4>
<p><i class="material-icons">portrait</i>{{ usernameInput }}</p>
<p v-for="peerId in peerIds">
<i class="material-icons">portrait</i>{{ getUsername(peerId) }}
</p>
</div>
</div>
</div>
<div class="col s12 m7">
<h4>Chatbox</h4>
<div id="chatbox">
<p v-for="chat in chats">{{ chat.sender }}: {{ chat.message }}</p>
</div>
<div class="row">
<form v-on:submit="submitChat">
<div class="input-field col s10">
<input id="chat_message" type="text" v-model="chatMessageInput" />
<label for="chat_message">Your message</label>
</div>
<button class="btn-floating btn-large waves-effect waves-light red" type="submit">
<i class="material-icons">send</i>
</button>
</form>
</div>
</div>
</div>
</div>
</div>
</body>
<script>
const appPrefix = "secure-p2p-multichat-"; // the prefix we will preprend to usernames
const oldChats = localStorage.getItem("chats");
const chats = oldChats ? JSON.parse(oldChats) : []; // oldChats may be undefined, which throws error if passed into JSON.parse
const app = new Vue({
el: "#app",
data: {
screen: "login", // initialize at login screen
usernameInput: localStorage.getItem("username"), // to load saved username
peerError: "",
loading: false,
peer: {}, // initialize as empty object instead of undefined
targetIdInput: "",
peerIds: [], // connected to nobody at first
connections: {}, // maps peerIds to their correspondig PeerJS's DataConnection objects
chats,
chatMessageInput: ""
},
// in case you want to enable automatic login
/*mounted: function () {
if (this.usernameInput && this.usernameInput.length > 0) {
this.submitLogin();
}
},*/
watch: {
chats: function () {
const chatbox = document.getElementById("chatbox");
if (chatbox) chatbox.scrollTop = 99999999; // to automatically scroll the chatbox to the most recent chat message
}
},
methods: {
// util functions to convert username to peer ids and vice-versa
getPeerId: username => appPrefix + username,
getUsername: peerId => peerId ? peerId.slice(appPrefix.length) : "",
// we keep track of connections ourselves as suggested in peerjs's documentation
addConnection: function (conn) {
this.connections[conn.peer] = conn;
this.updatePeerIds();
console.log(`Connected to ${conn.peer}!`);
},
removeConnection: function (conn) {
delete this.connections[conn.peer];
this.updatePeerIds();
},
updatePeerIds: function () {
this.peerIds = Object.keys(this.connections);
},
disconnectPeer: function () {
this.peer.disconnect();
},
// called to properly configure connection's client listeners
configureConnection: function (conn) {
conn.on("data", data => {
// if data is about connections (the list of peers sent when connected)
if (data.type === "connections") {
data.peerIds.forEach(peerId => {
if (!this.connections[peerId]) {
this.initiateConnection(peerId);
}
});
} else if (data.type === "chat") {
this.receiveChat(data.chat);
}
// please note here that if data.type is undefined, this endpoint won't do anything!
});
conn.on("close", () => this.removeConnection(conn));
conn.on("error", () => this.removeConnection(conn));
// if the caller joins have a call, we merge calls
conn.metadata.peerIds.forEach(peerId => {
if (!this.connections[peerId]) {
this.initiateConnection(peerId);
}
});
},
// called to initiate a connection (by the caller)
initiateConnection: function (peerId) {
if (!this.peerIds.includes(peerId) && peerId !== this.peer.id) {
this.loading = true;
this.peerError = "";
console.log(`Connecting to ${peerId}...`);
const options = {
metadata: {
// if the caller has peers, we send them to merge calls
peerIds: this.peerIds
},
serialization: "json"
};
const conn = this.peer.connect(peerId, options);
this.configureConnection(conn);
conn.on("open", () => {
this.addConnection(conn);
if (this.getUsername(conn.peer) === this.targetIdInput) {
this.targetIdInput = "";
this.loading = false;
}
});
}
},
createPeer: function () {
// options are useful in development to connect to local peerjs server
this.peer = new Peer(this.getPeerId(this.usernameInput)/*, {
host: 'localhost',
port: 8080,
path: 'app'
}*/);
// when peer is connected to signaling server
this.peer.on("open", () => {
this.screen = "chat"; // changing screen
this.loading = false;
this.peerError = "";
});
// error listener
this.peer.on("error", error => {
if (error.type === "peer-unavailable") { // if connection with new peer can't be established
this.loading = false;
this.peerError = `${this.targetIdInput} is unreachable!`; // custom error message
this.targetIdInput = "";
} else if (error.type === "unavailable-id") { // if requested id (thus username) is already taken
this.loading = false;
this.peerError = `${this.usernameInput} is already taken!`; // custom error message
} else this.peerError = error; // default error message
});
// when peer receives a connection
this.peer.on('connection', conn => {
if (!this.peerIds.includes(conn.peer)) {
this.configureConnection(conn);
conn.on("open", () => {
this.addConnection(conn);
// send every connection previously established to connect everyone (merge chat rooms)
conn.send({
type: "connections",
peerIds: this.peerIds
});
});
}
});
},
submitLogin: function (event) {
if (event) event.preventDefault(); // to prevent default behavior which is to POST to the same page
if (this.usernameInput.length > 0 && !this.loading) {
this.loading = true; // update status
this.peerError = ""; // reset error status
localStorage.setItem("username", this.usernameInput); // set username cookie to instanciate it at the next session
this.createPeer();
}
},
submitConnection: function (event) {
event.preventDefault(); // to prevent default behavior which is to POST to the same page
const peerId = this.getPeerId(this.targetIdInput); // the peer's id we want to connect to
this.initiateConnection(peerId);
},
receiveChat: function (chat) {
this.chats.push(chat);
localStorage.setItem("chats", JSON.stringify(this.chats));
},
submitChat: function (event) {
event.preventDefault(); // to prevent default behavior which is to POST to the same page
if (this.chatMessageInput.length > 0) {
// the chat object's data
const chat = {
sender: this.usernameInput,
message: this.chatMessageInput,
timestamp: new Date().getTime()
};
this.receiveChat(chat); // simulate receiving a chat
// send chat object to connected users
Object.values(this.connections).forEach(conn => {
conn.send({
type: "chat",
chat
});
});
this.chatMessageInput = ""; // reset chat message input
}
}
}
});
</script>
</html>