node.js express request Proxy Response Cookies

nodejs-express-request-proxy-response-cookies.js

// where res is the Express res
// where response is the request module response
// assumes Lodash or Underscore is present

function proxyResponseCookies (res, response) {
  var setCookie = response.headers['set-cookie'];
  if (setCookie) {
    _.each(setCookie, function (cookie) {
      var name;
      var value;
      var cookieOptions = {};
      cookie = cookie.split(';');
      _.each(cookie, function (pairs, index) {
        var pair = pairs.split('=');
        var pairKey = (pair[0] || '').trim();
        var pairValue = (pair[1] || '').trim();
        // option
        if (index) {
          // expires
          if (pairKey === 'expires') {
            cookieOptions[pairKey] = new Date(pairValue);
          }
          // other
          else {
            cookieOptions[pairKey] = pairValue;
          }
        }
        // name/value
        else {
          name = pair[0];
          value = pair[1] || '';
        }
      });

      res.cookie(name, value, cookieOptions);
    });
  }
}