Node-Red SwitchBot Authentication Example

switchbot_function_node.txt

// Add module called 'crypto'

const token = msg.token;
const secret = msg.secret;

const t = Date.now();
const nonce = msg.payload;
const data = token + t + nonce;
const signTerm = crypto.createHmac('sha256', secret)
    .update(Buffer.from(data, 'utf-8'))
    .digest();
const sign = signTerm.toString("base64");

msg = { "headers": { "Authorization": token, "t": t, "sign": sign, "nonce": nonce } }

return msg;