Connecting to OBS Websocket Server with Authentication

obs-websocket.js

const obsConfig = {
  address: '127.0.0.1',
  port: 4455,
  password: 'your-password'
}

const socket = new WebSocket(`ws://${obsConfig.address}:${obsConfig.port}`);
const password = obsConfig.password;

socket.onopen = function(event) {
  console.log('Connected to OBS WebSocket server');
};

socket.onclose = function(event) {
  console.log('Disconnected from OBS WebSocket server');
  console.log('Reason:', event.reason);
  console.log('Code:', event.code);
};

socket.onerror = function(error) {
  console.error('WebSocket error:', error);
};

socket.onmessage = async function(event) {
  console.log('Received message:', event.data);

  const response = JSON.parse(event.data);

  // If the authentication is required, send a response
  if (response.d.authentication && response.op === 0) {
    const salt = response.d.authentication.salt;
    const challenge = response.d.authentication.challenge;
    const secret = await sha256Hash(password + salt);
    const authResponseHash = await sha256Hash(secret + challenge);

    const payload = {
      op: 1,
      d: {
        rpcVersion: 1,
        authentication:  authResponseHash,
      }
    }

    socket.send(JSON.stringify(payload));
  }
};

async function sha256Hash(inputText) {
  const utf8 = new TextEncoder().encode(inputText);
  const hashBuffer = await crypto.subtle.digest('SHA-256', utf8);
  const hashArray = Array.from(new Uint8Array(hashBuffer));
  const base64Hash = btoa(String.fromCharCode(...hashArray));
  return base64Hash;
}