void ga_AfterInsert(DataBuddyBase dataObject, EventArgs e)
{
Post post = dataObject as Post;
if (post != null)
{
// Check that post
// 1. Is Published
// 2. The current verison is set to be published
// 3. Is not a future dated post
if (post.IsPublished && post.PostStatus == PostStatus.Publish && post.Published.CompareTo(DateTime.UtcNow.AddMinutes(1.0)) <= 0)
{
// Blog Pings
if (EnablePings)
{
XmlRpcPings.SendPings(post, PingUrls);
}
// Check for links to send Trackbacks & Pingbacks
if (EnableTrackbacks)
{
LinkParser.CheckPost(post);
}
}
}
}
void ga_AfterUpdate(DataBuddyBase dataObject, EventArgs e)
{
Post post = dataObject as Post;
if (post != null)
{
// Check that post
// 1. Is Published
// 2. The current verison is set to be published
// 3. Was not published within the last 10 seconds (some plugins update the post immediately after it is created,
// which can cause double trackbacks/pings)
if (post.IsPublished && post.PostStatus == PostStatus.Publish && post.Published.CompareTo(DateTime.UtcNow.AddSeconds(-10.0)) <= 0)
{
// Blog Pings
if (EnablePings)
{
XmlRpcPings.SendPings(post, PingUrls);
}
// Check for links to send Trackbacks & Pingbacks
if (EnableTrackbacks)
{
LinkParser.CheckPost(post);
}
}
}
}
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.");
}
}
}
}
public static void CheckPost(Post post)
{
LinkParser lp = new LinkParser(SiteSettings.Get().Title, post.Title, new Macros().FullUrl(post.Url), post.Body, post.Excerpt("", "", "", 300), SiteSettings.BaseUrl);
ManagedThreadPool.QueueUserWorkItem(new WaitCallback(lp.CheckPost));
}
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);
}
public static void CheckPost(Post post)
{
LinkParser lp = new LinkParser(SiteSettings.Get().Title, post.Title, new Macros().FullUrl(post.Url), post.Body, post.Excerpt("", "", "", 300), SiteSettings.BaseUrl);
ManagedThreadPool.QueueUserWorkItem(new WaitCallback(lp.CheckPost));
}
/// <summary>
/// Retrieves a remote html page and determines if it contains a link to a given target url. Also gets the page title.
/// </summary>
internal static bool SourceContainsTarget(string sourceURI, string targetURI, out string pageTitle)
{
pageTitle = string.Empty;
Uri baseUri = new Uri(sourceURI);
string baseUrl = string.Format("{0}://{1}{2}", baseUri.Scheme, baseUri.Host, baseUri.Port == 80 ? string.Empty : ":" + baseUri.Port.ToString());
string page = null;
HttpWebRequest request = GRequest.CreateSafeRequest(sourceURI, targetURI);
request.MaximumAutomaticRedirections = 3;
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
if (response != null)
{
if (GRequest.IsContentTypeValid(response.ContentType, GRequest.ContentTypeCategory.HTML) && response.ContentLength < 300000)
{
page = GRequest.GetPageText(response);
}
response.Close();
}
}
if (string.IsNullOrEmpty(page))
{
return(false);
}
if (page.IndexOf(targetURI) < 0)
{
// The direct link to the Graffiti post was not found in the body of the source post
// BUT, the source may have linked to a url that redirected to the Graffiti post (i.e. Feedburner url)
List <string> links = LinkParser.GetLinks(page, baseUrl);
bool targetLinkFound = false;
foreach (string externalUrl in links)
{
if (string.IsNullOrEmpty(externalUrl))
{
continue;
}
try
{
string responseUrl = null;
HttpWebRequest request2 = GRequest.CreateSafeRequest(externalUrl, targetURI);
request2.MaximumAutomaticRedirections = 3;
using (HttpWebResponse response2 = request2.GetResponse() as HttpWebResponse)
{
if (response2 != null)
{
if (GRequest.IsContentTypeValid(response2.ContentType, GRequest.ContentTypeCategory.HTML) && response2.ContentLength < 300000)
{
responseUrl = response2.ResponseUri.ToString();
}
response2.Close();
}
}
if (responseUrl != null && string.Compare(targetURI, responseUrl, StringComparison.InvariantCultureIgnoreCase) == 0)
{
targetLinkFound = true;
break;
}
}
catch { }
}
if (!targetLinkFound)
{
return(false);
}
}
// Look for the HTML Title of the remote page
string pat = @"<head.*?>.*<title.*?>(.*)</title.*?>.*</head.*?>";
Regex reg = new Regex(pat, RegexOptions.IgnoreCase | RegexOptions.Singleline);
Match m = reg.Match(page);
if (m.Success)
{
pageTitle = HttpUtility.HtmlDecode(Graffiti.Core.Util.RemoveHtml(m.Result("$1").Replace("\r", "").Replace("\n", "").Replace("\t", "").Trim(), 250));
}
return(true);
}
