/// <summary>
/// Enables processing of HTTP Web requests by a custom HttpHandler that implements
/// the <see cref="T:System.Web.IHttpHandler"></see> interface.
/// </summary>
/// <param name="context">An <see cref="T:System.Web.HttpContext"></see> object that provides references
/// to the intrinsic server objects (for example, Request, Response, Session, and Server) used to service HTTP requests.
/// </param>
public void ProcessRequest(HttpContext context)
{
string title = RetrieveTitle(context);
SyndicationFormat format = RetrieveFormat(context);
List<IPublishable> list = GenerateItemList(context);
list = CleanList(list);
if (string.IsNullOrEmpty(context.Request.QueryString["post"]))
{
// Shorten the list to the number of posts stated in the settings, except for the comment feed.
int max = Math.Min(TrainSettings.Instance.PostsPerFeed, list.Count);
list = list.FindAll(delegate(IPublishable item)
{
return item.IsVisible == true;
});
list = list.GetRange(0, max);
}
SetHeaderInformation(context, list, format);
if (TrainSettings.Instance.EnableHttpCompression)
HttpModules.CompressionModule.CompressResponse(context);
SyndicationGenerator generator = new SyndicationGenerator(TrainSettings.Instance, Category.Categories);
generator.WriteFeed(format, context.Response.OutputStream, list, title);
}
//============================================================
// PRIVATE ATOM METHODS
//============================================================
#region WriteAtomContent(XmlWriter writer, List<IPublishable> publishables)
/// <summary>
/// Writes the Atom feed element information to the specified <see cref="XmlWriter"/> using the supplied collection.
/// </summary>
/// <param name="writer">The <see cref="XmlWriter"/> to write channel element information to.</param>
/// <param name="publishables">The collection of <see cref="IPublishable"/> objects used to generate syndication content.</param>
/// <param name="title">The title of the ATOM content.</param>
private void WriteAtomContent(XmlWriter writer, List <IPublishable> publishables, string title)
{
//------------------------------------------------------------
// Write required feed elements
//------------------------------------------------------------
writer.WriteElementString("id", Utils.AbsoluteWebRoot.ToString());
writer.WriteElementString("title", title);
writer.WriteElementString("updated", (publishables.Count > 0) ? SyndicationGenerator.ToW3CDateTime(publishables[0].DateModified.ToUniversalTime()) : SyndicationGenerator.ToW3CDateTime(DateTime.UtcNow));
//------------------------------------------------------------
// Write recommended feed elements
//------------------------------------------------------------
writer.WriteStartElement("link");
writer.WriteAttributeString("href", Utils.AbsoluteWebRoot.ToString());
writer.WriteEndElement();
writer.WriteStartElement("link");
writer.WriteAttributeString("rel", "self");
writer.WriteAttributeString("href", Utils.AbsoluteWebRoot + "syndication.axd?format=atom");
writer.WriteEndElement();
//writer.WriteStartElement("link");
//writer.WriteAttributeString("rel", "alternate");
//writer.WriteAttributeString("href", Utils.FeedUrl.ToString());
//writer.WriteEndElement();
//------------------------------------------------------------
// Write optional feed elements
//------------------------------------------------------------
writer.WriteElementString("subtitle", this.Settings.Description);
//------------------------------------------------------------
// Write common/shared feed elements
//------------------------------------------------------------
this.WriteAtomContentCommonElements(writer);
foreach (IPublishable publishable in publishables)
{
//------------------------------------------------------------
// Skip publishable content if it is not visible
//------------------------------------------------------------
if (!publishable.IsVisible)
{
continue;
}
//------------------------------------------------------------
// Write <entry> element for publishable content
//------------------------------------------------------------
WriteAtomEntry(writer, publishable);
}
}
/// <summary>
/// Writes the Atom feed entry element information to the specified <see cref="XmlWriter"/> using the supplied <see cref="Page"/>.
/// </summary>
/// <param name="writer">The <see cref="XmlWriter"/> to write feed entry element information to.</param>
/// <param name="publishable">The <see cref="IPublishable"/> used to generate feed entry content.</param>
private static void WriteAtomEntry(XmlWriter writer, IPublishable publishable)
{
Training post = publishable as Training;
Comment comment = publishable as Comment;
//------------------------------------------------------------
// Raise serving event
//------------------------------------------------------------
ServingEventArgs arg = new ServingEventArgs(publishable.Content, ServingLocation.Feed);
publishable.OnServing(arg);
if (arg.Cancel)
{
return;
}
//------------------------------------------------------------
// Modify publishable content to make references absolute
//------------------------------------------------------------
string content = ConvertPathsToAbsolute(arg.Body);
writer.WriteStartElement("entry");
//------------------------------------------------------------
// Write required entry elements
//------------------------------------------------------------
writer.WriteElementString("id", Utils.ConvertToAbsolute(publishable.RelativeLink).ToString());
writer.WriteElementString("title", publishable.Title);
writer.WriteElementString("updated", SyndicationGenerator.ToW3CDateTime(publishable.DateCreated.ToUniversalTime()));
//------------------------------------------------------------
// Write recommended entry elements
//------------------------------------------------------------
writer.WriteStartElement("link");
writer.WriteAttributeString("rel", "self");
writer.WriteAttributeString("href", SyndicationGenerator.GetPermaLink(publishable).ToString());
writer.WriteEndElement();
writer.WriteStartElement("link");
writer.WriteAttributeString("href", Utils.ConvertToAbsolute(publishable.RelativeLink).ToString());
writer.WriteEndElement();
writer.WriteStartElement("author");
writer.WriteElementString("name", publishable.Author);
writer.WriteEndElement();
writer.WriteStartElement("summary");
writer.WriteAttributeString("type", "html");
writer.WriteString(content);
writer.WriteEndElement();
//------------------------------------------------------------
// Write optional entry elements
//------------------------------------------------------------
writer.WriteElementString("published", SyndicationGenerator.ToW3CDateTime(publishable.DateCreated.ToUniversalTime()));
writer.WriteStartElement("link");
writer.WriteAttributeString("rel", "related");
writer.WriteAttributeString("href", String.Concat(Utils.ConvertToAbsolute(publishable.RelativeLink).ToString(), "#comment"));
writer.WriteEndElement();
//------------------------------------------------------------
// Write enclosure tag for podcasting support
//------------------------------------------------------------
if (TrainSettings.Instance.EnableEnclosures)
{
string encloser = GetEnclosure(content);
if (!string.IsNullOrEmpty(encloser))
{
writer.WriteRaw(encloser);
}
}
//------------------------------------------------------------
// Write entry category elements
//------------------------------------------------------------
if (publishable.Categories != null)
{
foreach (Category category in publishable.Categories)
{
writer.WriteStartElement("category");
writer.WriteAttributeString("term", category.Title);
writer.WriteEndElement();
}
}
//------------------------------------------------------------
// Write Dublin Core syndication extension elements
//------------------------------------------------------------
if (!String.IsNullOrEmpty(publishable.Author))
{
writer.WriteElementString("dc", "publisher", "http://purl.org/dc/elements/1.1/", publishable.Author);
}
if (!String.IsNullOrEmpty(publishable.Description))
{
writer.WriteElementString("dc", "description", "http://purl.org/dc/elements/1.1/", publishable.Description);
}
//------------------------------------------------------------
// Write pingback syndication extension elements
//------------------------------------------------------------
Uri pingbackServer;
if (Uri.TryCreate(String.Concat(Utils.AbsoluteWebRoot.ToString().TrimEnd('/'), "/pingback.axd"), UriKind.RelativeOrAbsolute, out pingbackServer))
{
writer.WriteElementString("pingback", "server", "http://madskills.com/public/xml/rss/module/pingback/", pingbackServer.ToString());
writer.WriteElementString("pingback", "target", "http://madskills.com/public/xml/rss/module/pingback/", SyndicationGenerator.GetPermaLink(publishable).ToString());
}
//------------------------------------------------------------
// Write slash syndication extension elements
//------------------------------------------------------------
if (post != null && post.Comments != null)
{
writer.WriteElementString("slash", "comments", "http://purl.org/rss/1.0/modules/slash/", post.Comments.Count.ToString(CultureInfo.InvariantCulture));
}
//------------------------------------------------------------
// Write trackback syndication extension elements
//------------------------------------------------------------
if (post != null && post.TrackbackLink != null)
{
writer.WriteElementString("trackback", "ping", "http://madskills.com/public/xml/rss/module/trackback/", post.TrackbackLink.ToString());
}
//------------------------------------------------------------
// Write well-formed web syndication extension elements
//------------------------------------------------------------
writer.WriteElementString("wfw", "comment", "http://wellformedweb.org/CommentAPI/", String.Concat(Utils.ConvertToAbsolute(publishable.RelativeLink).ToString(), "#comment"));
writer.WriteElementString("wfw", "commentRss", "http://wellformedweb.org/CommentAPI/", Utils.AbsoluteWebRoot.ToString().TrimEnd('/') + "/syndication.axd?post=" + publishable.Id.ToString());
//------------------------------------------------------------
// Write </entry> element
//------------------------------------------------------------
writer.WriteEndElement();
}
/// <summary>
/// Converts the supplied <see cref="DateTime"/> to its equivalent <a href="http://www.w3.org/TR/NOTE-datetime">W3C DateTime</a> string representation.
/// </summary>
/// <param name="utcDateTime">The Coordinated Universal Time (UTC) <see cref="DateTime"/> to convert.</param>
/// <returns>The equivalent <a href="http://www.w3.org/TR/NOTE-datetime">W3C DateTime</a> string representation.</returns>
private static string ToW3CDateTime(DateTime utcDateTime)
{
TimeSpan utcOffset = TimeSpan.Zero;
return((utcDateTime + utcOffset).ToString("yyyy-MM-ddTHH:mm:ss", CultureInfo.InvariantCulture) + SyndicationGenerator.FormatW3cOffset(utcOffset, ":"));
}