public void ProcessRequest(HttpContext context)
{
Macros macros = new Macros();
context.Response.ContentType = "text/xml";
int postId = 0;
try { postId = int.Parse(context.Request.QueryString["id"]); }
catch { }
if (postId <= 0)
{
TrackbackResponse(context, "PostId is invalid or missing");
}
if (context.Request.HttpMethod == "POST")
{
string title = SafeParam(context, "title");
string excerpt = SafeParam(context, "excerpt");
string url = SafeParam(context, "url");
string blog_name = SafeParam(context, "blog_name");
try
{
// Check if params are valid
if (string.IsNullOrEmpty(url) || string.IsNullOrEmpty(title) || string.IsNullOrEmpty(blog_name) || string.IsNullOrEmpty(excerpt))
{
TrackbackResponse(context, "One or more parameters are invalid or missing");
}
Post trackedEntry = Post.GetCachedPost(postId);
if (trackedEntry == null)
{
TrackbackResponse(context, "The link does not exist");
return;
}
if (!trackedEntry.EnableComments || !trackedEntry.EnableNewComments)
{
TrackbackResponse(context, "Trackbacks are not enabled");
return;
}
if (!IsNewTrackBack(trackedEntry.Id, url))
{
TrackbackResponse(context, "Trackbacks already exists");
return;
}
string pageTitle = null;
if (!LinkParser.SourceContainsTarget(url, macros.FullUrl(trackedEntry.Url), out pageTitle))
{
TrackbackResponse(context, "Sorry couldn't find a relevant link in " + url);
}
if (string.IsNullOrEmpty(pageTitle))
{
TrackbackResponse(context, "Could not find a readable HTML title in the remote page at " + url);
return;
}
if (!string.IsNullOrEmpty(excerpt))
{
excerpt = Util.RemoveHtml(excerpt, 250);
}
// Create the Trackback item
Comment comment = new Comment();
comment.IsTrackback = true;
comment.PostId = trackedEntry.Id;
comment.Name = title;
comment.WebSite = url;
comment.Body = excerpt;
comment.IPAddress = context.Request.UserHostAddress;
comment.Published = DateTime.Now.AddHours(SiteSettings.Get().TimeZoneOffSet);
comment.Save();
// Log success message to EventLog
string message = String.Format("Trackback request received from {0} and saved to post {1}.", url, trackedEntry.Title);
Log.Info("Trackback Received", message);
context.Response.Write(successResponseXML);
context.Response.End();
}
catch (System.Threading.ThreadAbortException) { }
catch (System.Exception ex)
{
if (ex.Message != null)
{
TrackbackResponse(context, string.Format("Error occurred while processing Trackback: {0}", ex.Message));
}
else
{
TrackbackResponse(context, "Unknown error occurred while processing Trackback.");
}
}
}
}
private void CreatePingBack(string sourceURI, string targetURI)
{
// Check Parameters
if (string.IsNullOrEmpty(sourceURI))
{
throw new XmlRpcFaultException(errorCode_SourceURIDoesNotExist, "No source URI parameter found, please try harder!");
}
if (string.IsNullOrEmpty(targetURI))
{
throw new XmlRpcFaultException(errorCode_TargetURIDoesNotExist, "The target URI does not exist!");
}
// Retrieve referenced post
Post trackedEntry = null;
try
{
trackedEntry = GetPostFromUrl(targetURI);
}
catch
{
throw new XmlRpcFaultException(errorCode_TargetURIInvalid, "The target URI is invalid.");
}
if (trackedEntry == null)
{
throw new XmlRpcFaultException(errorCode_TargetURIInvalid, "The target URI is invalid.");
}
// Check if trackbacks/pingbacks are enabled
if (!trackedEntry.EnableComments || !trackedEntry.EnableNewComments)
{
throw new XmlRpcFaultException(errorCode_AccessDenied, "Pingbacks are not enabled.");
}
// Check if this is a duplicate pingback (or trackback)
if (!IsNewTrackBack(trackedEntry.Id, sourceURI))
{
throw new XmlRpcFaultException(errorCode_DuplicatePingBack, "A pingback for this source URI already exists.");
}
// Retrieve the source document and check if it actually contains a link to the target
string pageTitle = null;
if (!LinkParser.SourceContainsTarget(sourceURI, new Macros().FullUrl(trackedEntry.Url), out pageTitle))
{
throw new XmlRpcFaultException(errorCode_SourceDoesNotContainTarget, "Sorry couldn't find a relevant link in " + sourceURI);
}
if (string.IsNullOrEmpty(pageTitle))
{
throw new XmlRpcFaultException(errorCode_SourceDoesNotContainTarget, "Could not find a readable HTML title in the remote page at " + sourceURI);
}
// Create the Trackback item
Comment comment = new Comment();
comment.IsTrackback = true;
comment.PostId = trackedEntry.Id;
comment.Name = pageTitle;
comment.WebSite = sourceURI;
comment.Body = "Pingback from " + pageTitle;
comment.IPAddress = Context.Request.UserHostAddress;
comment.Published = DateTime.Now.AddHours(SiteSettings.Get().TimeZoneOffSet);
comment.Save();
// Log success message to EventLog
string message = String.Format("Pingback request received from {0} and saved to post {1}.", sourceURI, trackedEntry.Title);
Log.Info("Pingback Received", message);
}