Claims Authentication Helper Class for the Windows Phone 7

The other day I talked about doing Windows Authentication within a Windows Phone 7 application.  I wanted to make it a simpler process so I created a helper class to do this:

public static class ClaimsAuthentication
    static WSTrustClient client;

    public static class Endpoints
        public const string AdfsAuthentication = "/adfs/services/trust/13/usernamemixed";

    public static void AuthenticateAsync(string endpoint, 
IRequestCredentials credentials,
string appliesTo) { client = GetWSTrustClient(endpoint, credentials); var rst = new RequestSecurityToken(WSTrust13Constants.KeyTypes.Bearer) { AppliesTo = new EndpointAddress(appliesTo) }; client.IssueCompleted += client_IssueCompleted; client.IssueAsync(rst); } private static void client_IssueCompleted(object sender, IssueCompletedEventArgs e) { client.IssueCompleted -= client_IssueCompleted; if (e.Error == null) Application.Current.SetPrincipal(e.Result); IssueCompleted(sender, e); } public static event EventHandler<IssueCompletedEventArgs> IssueCompleted; private static WSTrustClient GetWSTrustClient(string stsEndpoint,
IRequestCredentials credentials) { return new WSTrustClient(new WSTrustBindingUsernameMixed(),
new EndpointAddress(stsEndpoint), credentials); } }

You can call it like this:

private void button1_Click(object sender, RoutedEventArgs e)
    if (!CheckCredentials())
        MessageBox.Show("Credentials Are Missing.");

    string endpoint = string.Format("https://{0}{1}", "", 
ClaimsAuthentication.Endpoints.AdfsAuthentication); ClaimsAuthentication.IssueCompleted += new EventHandler
<IssueCompletedEventArgs>(ClaimsAuthenticationHelper_IssueCompleted); ClaimsAuthentication.AuthenticateAsync(endpoint,
new UsernameCredentials(“user”, “pass”),
"urn:someapp:blah"); } void ClaimsAuthenticationHelper_IssueCompleted(object sender, IssueCompletedEventArgs e) { if (e.Error != null) { showError(e.Error); return; } DoSomething(); }