js如何实现一个基于webrtc的p2p即时通讯和群聊系统，端对端数据是加密的？
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使用webrtc技术实现这个功能，我们需要一个信令服务器来传递sdp，我们用nodejs的ws来搭建：
nodejs搭建的websocket服务器代码：
const WebSocket = require('ws');
const wss = new WebSocket.Server({ port: 8080 });
const clients = new Map();
wss.on('connection', (ws) => {
const clientId = generateClientId();
clients.set(clientId, ws);
// 发送当前客户端的ID
ws.send(JSON.stringify({
type: 'id',
id: clientId
}));
ws.on('message', (message) => {
const data = JSON.parse(message);
if (data.type === 'offer') {
const targetClient = clients.get(data.to);
if (targetClient) {
targetClient.send(JSON.stringify({
type: 'offer',
offer: data.offer,
from: clientId
}));
}
} else if (data.type === 'answer') {
const targetClient = clients.get(data.to);
if (targetClient) {
targetClient.send(JSON.stringify({
type: 'answer',
answer: data.answer,
from: clientId
}));
}
} else if (data.type === 'ice-candidate') {
const targetClient = clients.get(data.to);
if (targetClient) {
targetClient.send(JSON.stringify({
type: 'ice-candidate',
candidate: data.candidate,
from: clientId
}));
}
}
});
ws.on('close', () => {
clients.delete(clientId);
broadcastClients();
});
broadcastClients();
});
function broadcastClients() {
const clientIds = Array.from(clients.keys());
clients.forEach((client, id) => {
client.send(JSON.stringify({
type: 'clients',
clients: clientIds
}));
});
}
function generateClientId() {
return Math.random().toString(36).substr(2, 9);
}
前端html5客户端代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>WebRTC File Transfer</title>
<style>
body {
font-family: Arial, sans-serif;
margin: 20px;
}
#clients {
margin-bottom: 20px;
}
#file-input {
margin-bottom: 20px;
}
#status {
margin-top: 20px;
font-weight: bold;
}
#download-link {
display: none;
margin-top: 20px;
color: blue;
text-decoration: underline;
cursor: pointer;
}
</style>
</head>
<body>
<h1>WebRTC File Transfer</h1>
<div id="clients">
<h2>Available Clients:</h2>
<ul id="client-list"></ul>
</div>
<input type="file" id="file-input">
<button id="send-button" disabled>Send File</button>
<div id="status"></div>
<a id="download-link">Download File</a>
<script >
const socket = new WebSocket('ws://nodejs搭建的websocket服务器:8080');
const CHUNK_SIZE = 16384; // 16KB 的块大小
let receivedSize = 0;
let fileSize = 0;
let receivedChunks = [];
const clientList = document.getElementById('client-list');
const fileInput = document.getElementById('file-input');
const sendButton = document.getElementById('send-button');
const statusDiv = document.getElementById('status');
const downloadLink = document.getElementById('download-link'); // 用于显示下载链接
let peerConnection;
let selectedClientId;
let currentClientId; // 当前客户端的ID
// Initialize peerConnection
function initializePeerConnection() {
peerConnection = new RTCPeerConnection();
peerConnection.onicecandidate = (event) => {
if (event.candidate) {
socket.send(JSON.stringify({
type: 'ice-candidate',
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