/// <summary>
/// Performs discovery on the Identifier.
/// </summary>
/// <param name="requestHandler">The web request handler to use for discovery.</param>
/// <returns>
/// An initialized structure containing the discovered provider endpoint information.
/// </returns>
internal override IEnumerable<ServiceEndpoint> Discover(IDirectWebRequestHandler requestHandler)
{
List<ServiceEndpoint> endpoints = new List<ServiceEndpoint>();
// Attempt YADIS discovery
DiscoveryResult yadisResult = Yadis.Discover(requestHandler, this, IsDiscoverySecureEndToEnd);
if (yadisResult != null) {
if (yadisResult.IsXrds) {
XrdsDocument xrds = new XrdsDocument(yadisResult.ResponseText);
var xrdsEndpoints = xrds.CreateServiceEndpoints(yadisResult.NormalizedUri, this);
// Filter out insecure endpoints if high security is required.
if (IsDiscoverySecureEndToEnd) {
xrdsEndpoints = xrdsEndpoints.Where(se => se.IsSecure);
}
endpoints.AddRange(xrdsEndpoints);
}
// Failing YADIS discovery of an XRDS document, we try HTML discovery.
if (endpoints.Count == 0) {
var htmlEndpoints = new List<ServiceEndpoint>(DiscoverFromHtml(yadisResult.NormalizedUri, this, yadisResult.ResponseText));
if (htmlEndpoints.Any()) {
Logger.Yadis.DebugFormat("Total services discovered in HTML: {0}", htmlEndpoints.Count);
Logger.Yadis.Debug(htmlEndpoints.ToStringDeferred(true));
endpoints.AddRange(htmlEndpoints.Where(ep => !IsDiscoverySecureEndToEnd || ep.IsSecure));
if (endpoints.Count == 0) {
Logger.Yadis.Info("No HTML discovered endpoints met the security requirements.");
}
} else {
Logger.Yadis.Debug("HTML discovery failed to find any endpoints.");
}
} else {
Logger.Yadis.Debug("Skipping HTML discovery because XRDS contained service endpoints.");
}
}
return endpoints;
}
