Uri FindTargetUrl(Uri sendUrl, HttpWebResponseAbstraction response)
{
string ping_url = response.Headers["x-pingback"];
if (!String.IsNullOrEmpty(ping_url))
{
return(new Uri(ping_url));
}
Stream receiveStream = response.GetResponseStream();
if (response.ContentEncoding.ToUpperInvariant().Contains("GZIP"))
{
receiveStream = new GZipStream(receiveStream, CompressionMode.Decompress);
}
else if (response.ContentEncoding.ToUpperInvariant().Contains("DEFLATE"))
{
receiveStream = new DeflateStream(receiveStream, CompressionMode.Decompress);
}
HtmlDocument html = new HtmlDocument();
html.Load(receiveStream);
var node = html.DocumentNode.SelectSingleNode("//link[@rel='pingback' and @href]");
if (node != null)
{
return(new Uri(node.Attributes["href"].Value));
}
throw new LinkbackSendException(String.Format(CultureInfo.InvariantCulture, "{0} url discovering failed for {1}", Name, sendUrl));
}
void SendToTarget(Uri targetUrl, LinkbackSendParameters parameters)
{
HttpWebRequestAbstraction request = HttpWebRequestAbstraction.Create(targetUrl);
SetupRequest(request, parameters);
using (HttpWebResponseAbstraction response = request.GetResponse())
{
if (!response.IsHttpStatusCode2XX)
{
throw new LinkbackSendException(String.Format(CultureInfo.InvariantCulture, "Http error while sending {0} for {1}", Name, targetUrl));
}
Stream receiveStream = response.GetResponseStream();
if (response.ContentEncoding.ToUpperInvariant().Contains("GZIP"))
{
receiveStream = new GZipStream(receiveStream, CompressionMode.Decompress);
}
else if (response.ContentEncoding.ToUpperInvariant().Contains("DEFLATE"))
{
receiveStream = new DeflateStream(receiveStream, CompressionMode.Decompress);
}
StreamReader streamReader = new StreamReader(receiveStream, Encoding.UTF8);
ParseResponse(targetUrl, streamReader.ReadToEnd());
}
}
protected override Uri DiscoveryTargetUrl(Uri sendUrl, LinkbackSendParameters parameters)
{
HttpWebRequestAbstraction request = HttpWebRequestAbstraction.Create(sendUrl);
using (HttpWebResponseAbstraction response = request.GetResponse())
{
if (response.IsHttpStatusCode2XX)
{
return(FindTargetUrl(sendUrl, response));
}
}
throw new LinkbackSendException(String.Format(CultureInfo.InvariantCulture, "Http error while discovering {0} url for {1}", Name, sendUrl));
}
protected string DownloadSourceContent(Uri sourceUrl)
{
HttpWebRequestAbstraction request = HttpWebRequestAbstraction.Create(sourceUrl);
using (HttpWebResponseAbstraction response = request.GetResponse())
{
if (response.IsHttpStatusCode2XX)
{
Stream receiveStream = response.GetResponseStream();
StreamReader streamReader = new StreamReader(receiveStream, Encoding.UTF8);
return(streamReader.ReadToEnd());
}
}
throw new LinkbackReceiveException(String.Format(CultureInfo.InvariantCulture, "Http error while discovering {0} source at {1}", Name, sourceUrl));
}
Uri FindTargetUrl(Uri sendUrl, LinkbackSendParameters parameters, HttpWebResponseAbstraction response)
{
Stream receiveStream = response.GetResponseStream();
if (response.ContentEncoding.ToUpperInvariant().Contains("GZIP"))
{
receiveStream = new GZipStream(receiveStream, CompressionMode.Decompress);
}
else if (response.ContentEncoding.ToUpperInvariant().Contains("DEFLATE"))
{
receiveStream = new DeflateStream(receiveStream, CompressionMode.Decompress);
}
StreamReader readStream = new StreamReader(receiveStream, Encoding.UTF8);
string content = readStream.ReadToEnd();
var matches = _regex_rdf.Matches(content);
if (matches.Count > 0)
{
foreach (Match match in matches)
{
if (String.Compare(match.Groups[1].ToString().Trim(), sendUrl.ToString(), StringComparison.OrdinalIgnoreCase) == 0)
{
string trackback_ping_url = match.Groups[2].ToString().Trim();
return(new Uri(trackback_ping_url, UriKind.Absolute));
}
}
}
if (parameters.AutoDiscovery == null)
{
return(sendUrl);
}
throw new LinkbackSendException(String.Format(CultureInfo.InvariantCulture, "RDF not found while discovering {0} url for {1}", Name, sendUrl));
}
