LinkUp-P2P-Chat/app.js

import Hyperswarm from 'hyperswarm';
import crypto from 'hypercore-crypto';
import b4a from 'b4a';
import ServeDrive from 'serve-drive';
import Hyperdrive from 'hyperdrive';
import Corestore from 'corestore';
import { EventEmitter } from 'events';
import fs from "fs";

const storagePath = `./storage/storage_${Date.now()}_${Math.random().toString(36).substring(2, 15)}`;
const store = new Corestore(storagePath);
const drive = new Hyperdrive(store);

await drive.ready();

let swarm;
let registeredUsers = JSON.parse(localStorage.getItem('registeredUsers')) || {};
let peerCount = 0;
let currentRoom = null;
const eventEmitter = new EventEmitter();

// Define servePort at the top level
let servePort;

// Object to store all the information we want to save
let config = {
  userName: '',
  userAvatar: '',
  rooms: []
};

// Function to get a random port between 1337 and 2223
function getRandomPort() {
  return Math.floor(Math.random() * (65535 - 49152 + 1)) + 49152;
}

async function initialize() {
  swarm = new Hyperswarm();

  servePort = getRandomPort();
  const serve = new ServeDrive({ port: servePort, get: ({ key, filename, version }) => drive });
  await serve.ready();
  console.log('Listening on http://localhost:' + serve.address().port);

  const registerForm = document.querySelector('#register-form');
  const selectAvatarButton = document.querySelector('#select-avatar');
  const createChatRoomButton = document.querySelector('#create-chat-room');
  const joinChatRoomButton = document.querySelector('#join-chat-room');
  const messageForm = document.querySelector('#message-form');
  const toggleSetupBtn = document.querySelector('#toggle-setup-btn');
  const removeRoomBtn = document.querySelector('#remove-room-btn');
  const attachFileButton = document.getElementById('attach-file');
  const fileInput = document.getElementById('file-input');

  if (registerForm) {
    registerForm.addEventListener('submit', registerUser);
  }
  if (selectAvatarButton) {
    selectAvatarButton.addEventListener('click', () => {
      document.querySelector('#avatar-file').click();
    });
  }
  if (createChatRoomButton) {
    createChatRoomButton.addEventListener('click', createChatRoom);
  }
  if (joinChatRoomButton) {
    joinChatRoomButton.addEventListener('click', joinChatRoom);
  }
  if (messageForm) {
    messageForm.addEventListener('submit', sendMessage);
  }
  if (toggleSetupBtn) {
    toggleSetupBtn.addEventListener('click', toggleSetupView);
  }
  if (removeRoomBtn) {
    removeRoomBtn.addEventListener('click', leaveRoom);
  }
  if (attachFileButton) {
    attachFileButton.addEventListener('click', () => fileInput.click());
  }
  if (fileInput) {
    fileInput.addEventListener('change', async (event) => {
      const file = event.target.files[0];
      if (file) {
        const reader = new FileReader();
        reader.onload = async (event) => {
          const buffer = new Uint8Array(event.target.result);
          const filePath = `/files/${file.name}`;
          await drive.put(filePath, buffer);
          const fileUrl = `http://localhost:${servePort}${filePath}`;
          sendFileMessage(config.userName, fileUrl, file.type, config.userAvatar);
        };
        reader.readAsArrayBuffer(file);
      }
    });
  }

  const configExists = fs.existsSync("./config.json");
  if (configExists) {
    await readConfigFromFile("./config.json");
    console.log("Read config from file:", config)
    config.rooms.forEach(room => {
      addRoomToList(room);
    });
  }

  const registerDiv = document.querySelector('#register');
  if (registerDiv && !configExists) {
    registerDiv.classList.remove('hidden');
  }

  eventEmitter.on('onMessage', async (messageObj) => {
    if (messageObj.type === 'icon') {
      const username = messageObj.username;
      const avatarBuffer = Buffer.from(messageObj.avatar, 'base64');
      await drive.put(`/icons/${username}.png`, avatarBuffer);
      updateIcon(username, avatarBuffer);
    } else if (messageObj.type === 'file') {
      addFileMessage(messageObj.name, messageObj.fileName, messageObj.fileUrl, messageObj.fileType, messageObj.avatar);
    } else {
      onMessageAdded(messageObj.name, messageObj.message, messageObj.avatar);
    }
  });

  swarm.on('connection', async (connection, info) => {
    peerCount++;
    updatePeerCount();
    console.log('Peer connected, current peer count:', peerCount);

    // Send the current user's icon to the new peer
    const iconBuffer = await drive.get(`/icons/${config.userName}.png`);
    if (iconBuffer) {
      const iconMessage = JSON.stringify({
        type: 'icon',
        username: config.userName,
        avatar: iconBuffer.toString('base64'),
      });
      connection.write(iconMessage);
    }

    connection.on('data', (data) => {
      const messageObj = JSON.parse(data.toString());
      eventEmitter.emit('onMessage', messageObj);
    });

    connection.on('close', () => {
      peerCount--;
      updatePeerCount();
      console.log('Peer disconnected, current peer count:', peerCount);
    });
  });

  swarm.on('error', (err) => {
    console.error('Swarm error:', err);
  });

  swarm.on('close', () => {
    console.log('Swarm closed');
  });
}

function registerUser(e) {
  e.preventDefault();
  const regUsername = document.querySelector('#reg-username').value;

  if (registeredUsers[regUsername]) {
    alert('Username already taken. Please choose another.');
    return;
  }

  const avatarFile = document.querySelector('#avatar-file').files[0];
  if (avatarFile) {
    const reader = new FileReader();
    reader.onload = async (event) => {
      const buffer = new Uint8Array(event.target.result);
      await drive.put(`/icons/${regUsername}.png`, buffer);
      config.userAvatar = `http://localhost:${servePort}/icons/${regUsername}.png`; // Set the correct URL
      registeredUsers[regUsername] = config.userAvatar;
      localStorage.setItem('registeredUsers', JSON.stringify(registeredUsers));
      continueRegistration(regUsername);
    };
    reader.readAsArrayBuffer(avatarFile);
  } else {
    continueRegistration(regUsername);
  }
}

async function continueRegistration(regUsername) {
  const loadingDiv = document.querySelector('#loading');
  const setupDiv = document.querySelector('#setup');

  if (!regUsername) {
    alert('Please enter a username.');
    return;
  }

  config.userName = regUsername;
  setupDiv.classList.remove('hidden');
  document.querySelector('#register').classList.add('hidden');
  loadingDiv.classList.add('hidden');

  const randomTopic = crypto.randomBytes(32);
  document.querySelector('#chat-room-topic').innerText = truncateHash(b4a.toString(randomTopic, 'hex'));

  writeConfigToFile("./config.json");
}

async function createChatRoom() {
  const topicBuffer = crypto.randomBytes(32);
  const topic = b4a.toString(topicBuffer, 'hex');
  addRoomToList(topic);
  joinSwarm(topicBuffer);
}

async function joinChatRoom(e) {
  e.preventDefault();
  const topicStr = document.querySelector('#join-chat-room-topic').value;
  const topicBuffer = b4a.from(topicStr, 'hex');
  addRoomToList(topicStr);
  joinSwarm(topicBuffer);
}

async function joinSwarm(topicBuffer) {
  if (currentRoom) {
    currentRoom.destroy();
  }

  document.querySelector('#setup').classList.add('hidden');
  document.querySelector('#loading').classList.remove('hidden');

  const discovery = swarm.join(topicBuffer, { client: true, server: true });
  await discovery.flushed();

  const topic = b4a.toString(topicBuffer, 'hex');
  document.querySelector('#chat-room-topic').innerText = topic; // Set full topic here
  document.querySelector('#loading').classList.add('hidden');
  document.querySelector('#chat').classList.remove('hidden');

  currentRoom = discovery;
  clearMessages();
}

function addRoomToList(topic) {
  const roomList = document.querySelector('#room-list');
  const roomItem = document.createElement('li');
  roomItem.textContent = truncateHash(topic);
  roomItem.dataset.topic = topic;
  roomItem.addEventListener('click', () => switchRoom(topic));
  roomList.appendChild(roomItem);

  config.rooms.push(topic);
  writeConfigToFile("./config.json");
}

function switchRoom(topic) {
  const topicBuffer = b4a.from(topic, 'hex');
  joinSwarm(topicBuffer);
}

function leaveRoom() {
  if (currentRoom) {
    const topic = b4a.toString(currentRoom.topic, 'hex');
    const roomItem = document.querySelector(`li[data-topic="${topic}"]`);
    if (roomItem) {
      roomItem.remove();
    }
    currentRoom.destroy();
    currentRoom = null;
  }
  document.querySelector('#chat').classList.add('hidden');
  document.querySelector('#setup').classList.remove('hidden');

  config.rooms = config.rooms.filter(e => e !== currentRoom.topic);
  writeConfigToFile("./config.json");
}

function sendMessage(e) {
  e.preventDefault();
  const message = document.querySelector('#message').value;
  document.querySelector('#message').value = '';

  onMessageAdded(config.userName, message, config.userAvatar);

  const messageObj = JSON.stringify({
    type: 'message',
    name: config.userName,
    message,
    avatar: config.userAvatar,
    timestamp: Date.now(),
  });

  const peers = [...swarm.connections];
  for (const peer of peers) {
    peer.write(messageObj);
  }
}

function sendFileMessage(name, fileUrl, fileType, avatar) {
  const fileName = fileUrl.split('/').pop();
  const messageObj = JSON.stringify({
    type: 'file',
    name,
    fileName,
    fileUrl,
    fileType,
    avatar,
    timestamp: Date.now(),
  });

  const peers = [...swarm.connections];
  for (const peer of peers) {
    peer.write(messageObj);
  }

  addFileMessage(name, fileName, fileUrl, fileType, avatar);
}

function addFileMessage(from, fileName, fileUrl, fileType, avatar) {
  const $div = document.createElement('div');
  $div.classList.add('message');

  const $img = document.createElement('img');
  $img.src = avatar || 'https://via.placeholder.com/40';
  $img.classList.add('avatar');
  $div.appendChild($img);

  const $content = document.createElement('div');
  $content.classList.add('message-content');

  const $header = document.createElement('div');
  $header.classList.add('message-header');
  $header.textContent = from;
  $content.appendChild($header);

  if (fileType.startsWith('image/')) {
    const $image = document.createElement('img');
    $image.src = fileUrl;
    $image.alt = fileName;
    $image.classList.add('attached-image');
    $content.appendChild($image);
  } else {
    const $fileLink = document.createElement('a');
    $fileLink.href = fileUrl;
    $fileLink.textContent = `File: ${fileName}`;
    $fileLink.download = fileName;
    $content.appendChild($fileLink);
  }

  $div.appendChild($content);
  document.querySelector('#messages').appendChild($div);
  scrollToBottom();
}

function updatePeerCount() {
  const peerCountElement = document.querySelector('#peers-count');
  if (peerCountElement) {
    peerCountElement.textContent = peerCount; // Display the actual peer count
  }
}

function scrollToBottom() {
  var container = document.getElementById("messages-container");
  container.scrollTop = container.scrollHeight;
}

function onMessageAdded(from, message, avatar) {
  const $div = document.createElement('div');
  $div.classList.add('message');

  const $img = document.createElement('img');
  $img.src = avatar || 'https://via.placeholder.com/40'; // Default to a placeholder image if avatar URL is not provided
  $img.classList.add('avatar');
  $div.appendChild($img);

  const $content = document.createElement('div');
  $content.classList.add('message-content');

  const $header = document.createElement('div');
  $header.classList.add('message-header');
  $header.textContent = from;

  const $text = document.createElement('div');
  $text.classList.add('message-text');

  const md = window.markdownit();
  const markdownContent = md.render(message);
  $text.innerHTML = markdownContent;

  $content.appendChild($header);
  $content.appendChild($text);
  $div.appendChild($content);

  document.querySelector('#messages').appendChild($div);
  scrollToBottom();
}

function truncateHash(hash) {
  return `${hash.slice(0, 6)}...${hash.slice(-6)}`;
}

async function updateIcon(username, avatarBuffer) {
  const userIcon = document.querySelector(`img[src*="${username}.png"]`);
  if (userIcon) {
    const avatarBlob = new Blob([avatarBuffer], { type: 'image/png' });
    const avatarUrl = URL.createObjectURL(avatarBlob);
    userIcon.src = avatarUrl;

    config.userAvatar = avatarUrl;
    writeConfigToFile("./config.json");
  }
}

function clearMessages() {
  const messagesContainer = document.querySelector('#messages');
  while (messagesContainer.firstChild) {
    messagesContainer.removeChild(messagesContainer.firstChild);
  }
}

function toggleSetupView() {
  const setupDiv = document.querySelector('#setup');
  setupDiv.classList.toggle('hidden');
}

function writeConfigToFile(filePath) {
  fs.writeFile(filePath, JSON.stringify(config), (err) => {
    if (err) return console.error(err);
    console.log("File has been created");
  });
}

async function readConfigFromFile(filePath) {
  await fs.readFile(filePath, 'utf8', (err, data) => {
    if(err) return console.log("Error while reading config.json! ", err)
    data = JSON.parse(data);
    config = data;
  });
}

initialize();