public static XrdDocument FetchXRD(Uri location)
{
HttpWebResponse response;
Uri xrdUrl = null;
MemoryStream xrdStream = null;
try
{
using (MemoryStream stream = FetchWebDocument(location, XRD_AND_HTML_TYPES, out response))
{
if (stream != null)
{
if (IsXrdDocument(response.ContentType.ToLowerInvariant(), stream))
{
// We fetched an XRD document directly, skip ahead
xrdUrl = location;
xrdStream = stream;
response.Close();
}
else
{
#region LRDD
// 1. Check the HTTP headers for Link: <...>; rel="describedby"; ...
xrdUrl = FindXrdDocumentLocationInHeaders(response.Headers);
// 2. Check the document body for <link rel="describedby" ...>
if (xrdUrl == null)
{
xrdUrl = FindXrdDocumentLocationInHtmlMetaTags(stream.GetStreamString());
}
// 3. TODO: Try and grab the /host-meta document
if (xrdUrl == null)
{
xrdUrl = FindXrdDocumentLocationFromHostMeta(new Uri(location, "/host-meta"));
}
response.Close();
// 4. Fetch the XRD document
if (xrdUrl != null)
{
xrdStream = FetchWebDocument(xrdUrl, XRD_TYPES, out response);
if (!IsXrdDocument(response.ContentType.ToLowerInvariant(), xrdStream))
{
m_log.Error("XRD fetch from " + xrdUrl + " failed");
xrdStream = null;
}
response.Close();
}
#endregion LRDD
}
if (xrdStream != null)
{
XrdParser parser = new XrdParser(xrdStream);
XrdDocument doc = parser.Document;
xrdStream.Dispose();
return(doc);
}
}
else
{
m_log.Warn("XRD discovery on endpoint " + location + " failed");
}
}
}
catch (XrdParseException ex)
{
m_log.Warn("Failed to parse XRD document at " + location + ": " + ex.Message);
}
return(null);
}
public static XrdDocument FetchXRD(Uri location)
{
HttpWebResponse response;
Uri xrdUrl = null;
MemoryStream xrdStream = null;
try
{
using (MemoryStream stream = FetchWebDocument(location, XRD_AND_HTML_TYPES, out response))
{
if (stream != null)
{
if (IsXrdDocument(response.ContentType.ToLowerInvariant(), stream))
{
// We fetched an XRD document directly, skip ahead
xrdUrl = location;
xrdStream = stream;
response.Close();
}
else
{
#region LRDD
// 1. Check the HTTP headers for Link: <...>; rel="describedby"; ...
xrdUrl = FindXrdDocumentLocationInHeaders(response.Headers);
// 2. Check the document body for <link rel="describedby" ...>
if (xrdUrl == null)
xrdUrl = FindXrdDocumentLocationInHtmlMetaTags(stream.GetStreamString());
// 3. TODO: Try and grab the /host-meta document
if (xrdUrl == null)
xrdUrl = FindXrdDocumentLocationFromHostMeta(new Uri(location, "/host-meta"));
response.Close();
// 4. Fetch the XRD document
if (xrdUrl != null)
{
xrdStream = FetchWebDocument(xrdUrl, XRD_TYPES, out response);
if (!IsXrdDocument(response.ContentType.ToLowerInvariant(), xrdStream))
{
m_log.Error("XRD fetch from " + xrdUrl + " failed");
xrdStream = null;
}
response.Close();
}
#endregion LRDD
}
if (xrdStream != null)
{
XrdParser parser = new XrdParser(xrdStream);
XrdDocument doc = parser.Document;
xrdStream.Dispose();
return doc;
}
}
else
{
m_log.Warn("XRD discovery on endpoint " + location + " failed");
}
}
}
catch (XrdParseException ex)
{
m_log.Warn("Failed to parse XRD document at " + location + ": " + ex.Message);
}
return null;
}