public static string GetHighestPriorityUri(XrdDocument document, Uri relationType)
{
foreach (XrdLink link in document.Links)
{
if (link.Relation.Equals(relationType))
{
return(link.Href);
}
}
return(null);
}
private void Parse()
{
XmlNamespaceManager nsMgr = new XmlNamespaceManager(cursor.NameTable);
nsMgr.AddNamespace("xrd", "http://docs.oasis-open.org/ns/xri/xrd-1.0");
var expires = cursor.SelectSingleNode("/xrd:XRD/xrd:Expires", nsMgr);
var subject = cursor.SelectSingleNode("/xrd:XRD/xrd:Subject", nsMgr);
var aliases = GetAll(cursor.Select("/xrd:XRD/xrd:Alias", nsMgr));
if (subject == null)
throw new XrdParseException("Missing Subject");
Uri subjectUri;
if (Uri.TryCreate(subject.Value, UriKind.Absolute, out subjectUri))
{
DateTime? expirationDate = null;
if (expires != null)
expirationDate = expires.ValueAsDateTime;
List<XrdLink> links = new List<XrdLink>();
XPathNodeIterator linkIter = cursor.Select("/xrd:XRD/xrd:Link", nsMgr);
while (linkIter.MoveNext())
{
var rel = linkIter.Current.SelectSingleNode("@rel", nsMgr);
var type = linkIter.Current.SelectSingleNode("@type", nsMgr);
var href = linkIter.Current.SelectSingleNode("@href", nsMgr);
var template = linkIter.Current.SelectSingleNode("@template", nsMgr);
Uri relUrl;
if (rel != null && Uri.TryCreate(rel.Value, UriKind.Absolute, out relUrl))
{
string typeStr = null;
if (type != null)
typeStr = type.Value;
string hrefUrl = null;
if (href != null)
hrefUrl = href.Value;
string templateStr = null;
if (template != null)
templateStr = template.Value;
XrdLink link = new XrdLink(relUrl, typeStr, hrefUrl, templateStr);
links.Add(link);
}
}
// Only keep the aliases that can be parsed as valid absolute URIs
List<Uri> validAliases = new List<Uri>(aliases.Count);
foreach (string alias in aliases)
{
Uri aliasUri;
if (Uri.TryCreate(alias, UriKind.Absolute, out aliasUri))
validAliases.Add(aliasUri);
}
result = new XrdDocument(subjectUri, expirationDate, validAliases, links);
}
}
public XrdParser(Stream xrd)
{
doc = new XPathDocument(xrd);
result = new XrdDocument(null);
cursor = doc.CreateNavigator();
}
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);
}
private void Parse()
{
XmlNamespaceManager nsMgr = new XmlNamespaceManager(cursor.NameTable);
nsMgr.AddNamespace("xrd", "http://docs.oasis-open.org/ns/xri/xrd-1.0");
var expires = cursor.SelectSingleNode("/xrd:XRD/xrd:Expires", nsMgr);
var subject = cursor.SelectSingleNode("/xrd:XRD/xrd:Subject", nsMgr);
var aliases = GetAll(cursor.Select("/xrd:XRD/xrd:Alias", nsMgr));
if (subject == null)
{
throw new XrdParseException("Missing Subject");
}
Uri subjectUri;
if (Uri.TryCreate(subject.Value, UriKind.Absolute, out subjectUri))
{
DateTime?expirationDate = null;
if (expires != null)
{
expirationDate = expires.ValueAsDateTime;
}
List <XrdLink> links = new List <XrdLink>();
XPathNodeIterator linkIter = cursor.Select("/xrd:XRD/xrd:Link", nsMgr);
while (linkIter.MoveNext())
{
var rel = linkIter.Current.SelectSingleNode("@rel", nsMgr);
var type = linkIter.Current.SelectSingleNode("@type", nsMgr);
var href = linkIter.Current.SelectSingleNode("@href", nsMgr);
var template = linkIter.Current.SelectSingleNode("@template", nsMgr);
Uri relUrl;
if (rel != null && Uri.TryCreate(rel.Value, UriKind.Absolute, out relUrl))
{
string typeStr = null;
if (type != null)
{
typeStr = type.Value;
}
string hrefUrl = null;
if (href != null)
{
hrefUrl = href.Value;
}
string templateStr = null;
if (template != null)
{
templateStr = template.Value;
}
XrdLink link = new XrdLink(relUrl, typeStr, hrefUrl, templateStr);
links.Add(link);
}
}
// Only keep the aliases that can be parsed as valid absolute URIs
List <Uri> validAliases = new List <Uri>(aliases.Count);
foreach (string alias in aliases)
{
Uri aliasUri;
if (Uri.TryCreate(alias, UriKind.Absolute, out aliasUri))
{
validAliases.Add(aliasUri);
}
}
result = new XrdDocument(subjectUri, expirationDate, validAliases, links);
}
}
public XrdParser(Stream xrd)
{
doc = new XPathDocument(xrd);
result = new XrdDocument(null);
cursor = doc.CreateNavigator();
}
public static string GetHighestPriorityUri(XrdDocument document, Uri relationType)
{
foreach (XrdLink link in document.Links)
{
if (link.Relation.Equals(relationType))
return link.Href;
}
return null;
}