public ActionResult RssJs(string url)
{
try
{
var cacheKey = "conversion_" + url;
var cachedFeed = this.HttpContext.Cache[cacheKey] as CacheItem<RssJs>;
RssJs feed;
if (cachedFeed == null)
{
var fetcher = new SyndicationFetcher();
var content = fetcher.Fetch(new Uri(url));
if (content.IsFound)
{
feed = ConvertToRssJs(content.Item);
//todo: implement ETAG
//cache item for 6 hours
HttpContext.Cache.Add(cacheKey, feed, null, Cache.NoAbsoluteExpiration, new TimeSpan(0, 5, 0), CacheItemPriority.Default, null);
}
else
{
return HttpNotFound();
}
}
else
{
feed = cachedFeed.Item;
//todo implement ETAG
}
var json = JsonConvert.SerializeObject(feed, JsonSettings.Get());
var jsonP = "onGetRss(" + json + ")";
this.Compress();
return Content(jsonP, "application/javascript");
}
catch (Exception ex)
{
return HttpDoc<EmptyHttpReponse>.PreconditionFailed(ex.Message).ToJson();
}
}
public ActionResult AddSource(string syndicationGuid, string title, string uri)
{
if (string.IsNullOrWhiteSpace(syndicationGuid))
this.PropertyValidationMessage("SyndicationGuid", "A critical id is missing. Please refresh your page and try again");
if (string.IsNullOrWhiteSpace(title))
this.PropertyValidationMessage("Title", "Title is required");
if (string.IsNullOrWhiteSpace(uri))
this.PropertyValidationMessage("Uri", "Uri is required");
Uri xmlUrl = null;
try
{
xmlUrl = new Uri(uri);
}
catch
{
this.PropertyValidationMessage("Uri", "Given Uri is invalid. Please do not forget to include http://");
}
if (!ModelState.IsValid)
{
var errors = this.ProduceAJAXErrorMessage(ModelState);
return HttpDoc<EmptyHttpReponse>.PreconditionFailed(errors.ToJson()).ToJson();
}
var list = RavenSession.Query<SyndicationList>().Where(x => x.Guid == syndicationGuid).FirstOrDefault();
if (list == null)
this.PropertyValidationMessage("SyndicationGuid", "The Syndication List Id is not valid. Please refresh your page.");
else
{
try
{
var fetcher = new SyndicationFetcher();
var content = fetcher.Fetch(xmlUrl);
if (content.IsFound)
{
var name = Texts.ConvertTitleToName(title);
list.Sources.Items.Add(new RssSubscriptionItem
{
Name = name,
Text = title,
XmlUri = xmlUrl
});
RavenSession.Store(list);
this.RavenSession.SaveChanges();
SyndicationRiverJsCache.Flush(list.Name, HttpContext.Cache);
return HttpDoc<dynamic>.OK(new { Message = "Source added", Name = name }).ToJson();
}
else if (content.Exception != null)
{
var exception = content.Exception.Message;
if (content.Exception.InnerException != null)
exception += "-- Inner Exception --" + content.Exception.InnerException.Message;
this.PropertyValidationMessage("Uri", String.Format(
"Given Uri does not exist or is an invalid river format. The processing return the following error : {0}. Please try again.", exception));
}
else
this.PropertyValidationMessage("Uri", "Given Uri does not exist or is an invalid river format. Please try again.");
}
catch (Exception e)
{
this.PropertyValidationMessage("Uri", String.Format(
"Given Uri does not exist or is an invalid river format. The processing return the following error : {0}. Please try again.", e.Message));
}
}
if (!ModelState.IsValid)
{
var errors = this.ProduceAJAXErrorMessage(ModelState);
return HttpDoc<EmptyHttpReponse>.PreconditionFailed(errors.ToJson()).ToJson();
}
return HttpDoc<dynamic>.OK(new { Message = "Source added" }).ToJson();
}
public ActionResult Slim(string url, int maxSize)
{
try
{
var cacheKey = url;
var cachedFeed = this.HttpContext.Cache[cacheKey] as CacheItem<SyndicationFeed>;
string cachedEtagValue = String.Empty;
if (cachedFeed != null && cachedFeed.ETags.ContainsKey(maxSize.ToString()))
cachedEtagValue = cachedFeed.ETags[maxSize.ToString()];
string cachedEtag = this.FormatEtag(cachedEtagValue);
string ifNoneMatch = this.GetEtag();
if (!ifNoneMatch.IsNullOrWhiteSpace() && ifNoneMatch == cachedEtag)
{
return new HttpStatusCodeResult(304, "Not Modified");
}
SyndicationFeed feed;
if (cachedFeed == null)
{
var fetcher = new SyndicationFetcher();
var content = fetcher.Fetch(new Uri(url));
if (content.IsFound)
{
feed = Filter(content.Item, maxSize);
string newEtag = Guid.NewGuid().ToString();
var newCacheItem = new CacheItem<SyndicationFeed>(content.Item);
newCacheItem.ETags.Add(maxSize.ToString(), newEtag);
//cache item for 6 hours
HttpContext.Cache.Add(cacheKey, newCacheItem, null, Cache.NoAbsoluteExpiration, new TimeSpan(6, 0, 0), CacheItemPriority.Default, null);
this.Response.Cache.SetCacheability(HttpCacheability.Public);
this.Response.Cache.SetETag(this.FormatEtag(newEtag));
}
else
{
return HttpNotFound();
}
}
else
{
feed = Filter(cachedFeed.Item, maxSize);
if (cachedEtagValue.IsNullOrWhiteSpace())
{
string newEtag = Guid.NewGuid().ToString();
if (cachedFeed.ETags.ContainsKey(maxSize.ToString()))
cachedFeed.ETags[maxSize.ToString()] = newEtag;
else
cachedFeed.ETags.Add(maxSize.ToString(), newEtag);
HttpContext.Cache[cacheKey] = cachedFeed; //refresh the cached item with new etag values
this.Response.Cache.SetCacheability(HttpCacheability.Public);
this.Response.Cache.SetETag(this.FormatEtag(newEtag));
}
}
var rssOutput = new StringBuilder();
using (var xml = XmlWriter.Create(rssOutput))
{
feed.SaveAsRss20(xml);
}
//Read http://baleinoid.com/whaly/2009/07/xmlwriter-and-utf-8-encoding-without-signature/
var payload = rssOutput.ToString().Replace("encoding=\"utf-16\"", ""); //remove the Processing Instruction encoding mark for the xml body = it's a hack I know
this.Compress();
return Content(payload, "application/rss+xml");
}
catch (Exception ex)
{
return HttpDoc<EmptyHttpReponse>.PreconditionFailed(ex.Message).ToJson();
}
}