authenticate in LDAP

ldap_authenticate.js

let authenticate = (userId, password) => {
  return new Promise((resolve, reject) => {
    const ldapClient = ldapjs.createClient(ldapOptions);

    ldapClient.bind(
      'cn=' + userId + ',' + ldapConfig.domain,
      password,
      (err, res) => {
        if (err) {
          //@see https://github.com/mcavage/node-ldapjs/blob/7059cf6b8a0b4ff4c566714d97f3cef04f887c3b/test/client.test.js @ 305
          return reject(err);
        }
        ldapClient.unbind();
        return resolve(res);
      }
    );
  }
};