GladysProject/Gladys

const Promise = require('bluebird');
const crypto = require('crypto');

const randomBytes = Promise.promisify(crypto.randomBytes);

const REFRESH_TOKEN_LENGTH = 500;
const API_KEY_LENGTH = 32;

/**
 * @description Hash a refresh token.
 * @param {string} refreshToken - The refresh token to hash.
 * @returns {string} The hash of the refresh token.
 * @example
 * hashRefreshToken('xx');
 */
function hashRefreshToken(refreshToken) {
  const refreshTokenHash = crypto
    .createHash('sha256')
    .update(refreshToken)
    .digest('hex');
  return refreshTokenHash;
}

/**
 * @private
 * @description Generate a refresh token and its hash.
 * @example
 * const { refreshToken, refreshTokenhash } = await generateRefreshToken();
 * @returns {Promise} Resolving with refreshToken and refreshTokenHash.
 */
async function generateRefreshToken() {
  const refreshToken = (await randomBytes(Math.ceil(REFRESH_TOKEN_LENGTH / 2)))
    .toString('hex')
    .slice(0, REFRESH_TOKEN_LENGTH);
  const refreshTokenHash = hashRefreshToken(refreshToken);

  return {
    refreshToken,
    refreshTokenHash,
  };
}

/**
 * @private
 * @description Generate a refresh token and its hash.
 * @example
 * const { apiKey, apiKeyHash } = await generateApiKey();
 * @returns {Promise} Resolving with apiKey and apiKeyHash.
 */
async function generateApiKey() {
  const apiKey = (await randomBytes(Math.ceil(API_KEY_LENGTH / 2))).toString('hex').slice(0, API_KEY_LENGTH);
  const apiKeyHash = hashRefreshToken(apiKey);

  return {
    apiKey,
    apiKeyHash,
  };
}

module.exports = {
  generateRefreshToken,
  generateApiKey,
  hashRefreshToken,
};