/// <summary>
/// Handles the IdpLogin button to requests login at the Identify Provider site.
/// </summary>
/// <param name="sender">The button object.</param>
/// <param name="e">The event arguments.</param>
protected void btnIdPLogin_Click(object sender, EventArgs e)
{
// Create the authentication request.
AuthnRequest authnRequest = BuildAuthenticationRequest();
// Create and cache the relay state so we remember which SP resource the user wishes
// to access after SSO.
string spResourceUrl = Util.GetAbsoluteUrl(this, FormsAuthentication.GetRedirectUrl("", false));
string relayState = Guid.NewGuid().ToString();
SamlSettings.CacheProvider.Insert(relayState, spResourceUrl, new TimeSpan(1, 0, 0));
// Send the authentication request to the identity provider over the selected binding.
string idpUrl = string.Format("{0}?{1}={2}", WebConfigurationManager.AppSettings["SingleSignonIdProviderUrl"], Util.BindingVarName, HttpUtility.UrlEncode(spToIdPBindingList.SelectedValue));
switch (spToIdPBindingList.SelectedValue)
{
case SamlBindingUri.HttpRedirect:
X509Certificate2 x509Certificate = (X509Certificate2)Application[Global.SPCertKey];
authnRequest.Redirect(Response, idpUrl, relayState, x509Certificate.PrivateKey);
break;
case SamlBindingUri.HttpPost:
authnRequest.SendHttpPost(Response, idpUrl, relayState);
// Don't send this form.
Response.End();
break;
case SamlBindingUri.HttpArtifact:
// Create the artifact.
string identificationUrl = Util.GetAbsoluteUrl(this, "~/");
Saml2ArtifactType0004 httpArtifact = new Saml2ArtifactType0004(SamlArtifact.GetSourceId(identificationUrl), SamlArtifact.GetHandle());
// Cache the authentication request for subsequent sending using the artifact resolution protocol.
SamlSettings.CacheProvider.Insert(httpArtifact.ToString(), authnRequest.GetXml(), new TimeSpan(1, 0, 0));
// Send the artifact.
httpArtifact.Redirect(Response, idpUrl, relayState);
break;
}
}
