plugin.githubLogin = function(user, cb) {
  const urls = config.sys.urls;
  const leetcodeUrl = urls.github_login;
  const _request = request.defaults({jar: true});
  _request(urls.github_login_request, function(e, resp, body) {
    const authenticityToken = body.match(/name="authenticity_token" value="(.*?)"/); // The problem is here
    let gaId = body.match(/name="ga_id" value="(.*?)"/);
    if (!gaId) {
      gaId = '';
    }
    let requiredField = body.match(/name="required_field_(.*?)"/);
    const timestamp = body.match(/name="timestamp" value="(.*?)"/);
    const timestampSecret = body.match(/name="timestamp_secret" value="(.*?)"/);