Syndication of Google+ articles and notes to an RSS feed

RssController.cs

    // the controler:
    public class RssController : Controller
    {
        private readonly IGoogleSettings _settings;

        public RssController(IGoogleSettings settings)
        {
            _settings = settings;
        }

        [OutputCache(Duration = 120)]
        [HttpGet]
        public ActionResult Index()
        {
            var client = new RestClient("https://www.googleapis.com/plus/v1");
            
            var activityList = new RestRequest("/people/{userId}/activities/{collection}", Method.GET);
            activityList.AddUrlSegment("collection", "public");
            activityList.AddUrlSegment("userId", _settings.UserId);
            activityList.AddParameter("key", _settings.ApiKey);

            var response = client.Execute(activityList);
            var content = JObject.Parse(response.Content);
            var items = content["items"];

            return new RssResult("m0sa.net Google+ RSS Feed", "m0sa.net Google+ RSS Feed", GetSyndicationItems(items));
        }

        private static IEnumerable<SyndicationItem> GetSyndicationItems(IEnumerable<JToken> items)
        {
            foreach (var item in items ?? new JToken[0])
            {
                var id = item["id"];
                var published = item["published"];
                var updated = item["updated"];
                var @object = item["object"];
                if (@object == null) continue;
                var attachments = @object["attachments"];
                if (attachments == null) continue;
                var note = attachments.FirstOrDefault(x => x["objectType"].ToString() == "note");
                var article = attachments.FirstOrDefault(x => x["objectType"].ToString() == "article");
                var source = note ?? article;
                if(source == null) continue;
                var displayName = source["displayName"];
                var content = source["content"];
                var url = source["url"];
                if(displayName == null && content == null) continue;
                var rssItem = new SyndicationItem(displayName + "", content + "", new Uri(url + ""));
                rssItem.PublishDate = (DateTime)(updated ?? published);
                rssItem.Id = id + "";
                yield return rssItem;
            }
        }
    }

RssResult.cs

    // utilizing System.ServiceModel.Syndication to create a feed:
    public class RssResult : FileResult
    {
        private readonly SyndicationFeed _feed;

        public RssResult(string title, string description, IEnumerable<SyndicationItem> feedItems)
            : base("application/rss+xml")
        {
            _feed = new SyndicationFeed(title, description, HttpContext.Current.Request.Url) { Items = feedItems };
        }

        protected override void WriteFile(HttpResponseBase response)
        {
            using (var writer = XmlWriter.Create(response.OutputStream))
            {
                _feed.GetRss20Formatter().WriteTo(writer);
            }
        }
    }