/// <summary>
/// Sends a trackback message, and sees if te response is OK.
/// </summary>
/// <param name="message">The TrackbackMessage to send</param>
/// <returns>A boolean value indicating if the message sending was successfull</returns>
public static bool Send(TrackbackMessage message)
{
if (!BlogSettings.Instance.EnableTrackBackSend)
return false;
if (message == null)
throw new ArgumentNullException("message");
OnSending(message.UrlToNotifyTrackback);
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(message.UrlToNotifyTrackback);
request.Credentials = CredentialCache.DefaultNetworkCredentials;
request.Method = "POST";
request.ContentLength = message.ToString().Length;
request.ContentType = "application/x-www-form-urlencoded";
request.KeepAlive = false;
request.Timeout = 10000;
using (StreamWriter myWriter = new StreamWriter(request.GetRequestStream()))
{
myWriter.Write(message.ToString());
}
bool result = false;
HttpWebResponse response;
try
{
response = (HttpWebResponse)request.GetResponse();
OnSent(message.UrlToNotifyTrackback);
string answer;
using (System.IO.StreamReader sr = new System.IO.StreamReader(response.GetResponseStream()))
{
answer = sr.ReadToEnd();
}
if (response.StatusCode == HttpStatusCode.OK)
{
//This could be a strict XML parsing if necessary maybe logging activity here too
if (answer.Contains("<error>0</error>"))
{ result = true; }
else
{ result = false; }
}
else
{ result = false; }
}
catch(Exception)
{
result = false;
}
return result;
}
/// <summary>
/// Sends the trackback or pingback message.
/// <remarks>
/// It will try to send a trackback message first, and if the refered web page
/// doesn't support trackbacks, a pingback is sent.
/// </remarks>
/// <para>
/// Gets all anchors from the content of the IShowed item and ignores links to ourselves.
/// From all the rest of the links, we resolve them and check for trackback links,
/// if present we send trackback, else we do a pingback.
/// </para>
/// </summary>
public static void Send(IShowed item)
{
foreach (Uri url in GetUrlsFromContent(item.Content))
{
if (url.Host == SupportUtilities.AbsoluteWebRoot.Host)
continue;
string pageContent = ReadFromWeb(url);
Uri trackbackUrl = GetTrackBackUrlFromPage(pageContent);
bool isTrackbackSent = false;
if (trackbackUrl != null)
{
TrackbackMessage message = new TrackbackMessage(item, trackbackUrl);
isTrackbackSent = Trackback.Send(message);
}
if (!isTrackbackSent)
{
Pingback.Send(item.AbsoluteLink, url);
}
}
}
