bfx-api-node-util/lib/gen_auth_sig.js

Utilities for the Bitfinex node API

'use strict'

const crypto = require('crypto')
const getNonce = require('./nonce')

/**
 * Generates an auth signature, payload, and nonce for passing to the WS & REST
 * APIs
 * @param {string} apiSecret
 * @param {string?} payload - optional signature payload, generated by default
 * @return {Object} authSignature
 */
const genAuthSig = (secret, payload = '') => {
  const nonce = getNonce()
  if (payload.length === 0) {
    payload = `AUTH${nonce}${nonce}`
  }

  const sig = crypto
    .createHmac('sha384', secret)
    .update(payload)
    .digest('hex')

  return {
    payload,
    sig,
    nonce: getNonce()
  }
}

module.exports = genAuthSig