nullpointer for yahoo openid request, but not google (dotnetopenid)

Question

i'm programmatically doing an openid handshake with yahoo and google. google is fine, but yahoo throws a null pointer:

stack trace:

   System.NullReferenceException: Object reference not set to an instance of an object.
   at DotNetOpenAuth.OpenId.Extensions.ProviderAuthenticationPolicy.PolicyResponse.DotNetOpenAuth.Messaging.IMessageWithEvents.OnReceiving() in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\OpenId\Extensions\ProviderAuthenticationPolicy\PolicyResponse.cs:line 189
   at DotNetOpenAuth.OpenId.ChannelElements.ExtensionsBindingElement.<GetExtensions>d__a.MoveNext() in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\OpenId\ChannelElements\ExtensionsBindingElement.cs:line 209
   at DotNetOpenAuth.OpenId.ChannelElements.ExtensionsBindingElement.ProcessIncomingMessage(IProtocolMessage message) in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\OpenId\ChannelElements\ExtensionsBindingElement.cs:line 151
   at DotNetOpenAuth.Messaging.Channel.ProcessIncomingMessage(IProtocolMessage message) in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\Messaging\Channel.cs:line 906
   at DotNetOpenAuth.OpenId.ChannelElements.OpenIdChannel.ProcessIncomingMessage(IProtocolMessage message) in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\OpenId\ChannelElements\OpenIdChannel.cs:line 171
   at DotNetOpenAuth.Messaging.Channel.ReadFromRequest(HttpRequestInfo httpRequest) in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\Messaging\Channel.cs:line 377
   at DotNetOpenAuth.OpenId.RelyingParty.OpenIdRelyingParty.GetResponse(HttpRequestInfo httpRequestInfo) in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\OpenId\RelyingParty\OpenIdRelyingParty.cs:line 489
   at DotNetOpenAuth.OpenId.RelyingParty.OpenIdRelyingParty.GetResponse() in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\OpenId\RelyingParty\OpenIdRelyingParty.cs:line 478
   at Friendsell.UI.Controllers.Auth.OpenIdReturnController.DoProcessRequest(IExecutionContext context) in C:\Development\Friendsell\Friendsell.UI\Controllers\Auth\OpenIdController.cs:line 41
   at Bistro.Controllers.AbstractController.ProcessRequest(HttpContextBase context, IContext requestContext) in C:\Development\Bistro\Bistro.Core\Controllers\AbstractController.cs:line 41
   at Bistro.Controllers.MethodDispatcher.InvokeMethodDirect(HttpContextBase context, String requestPoint, IContext requestContext) in C:\Development\Bistro\Bistro.Core\Controllers\MethodDispatcher.cs:line 221
   at Bistro.Controllers.MethodDispatcher.InvokeMethod(HttpContextBase context, String requestPoint, IContext requestContext) in C:\Development\Bistro\Bistro.Core\Controllers\MethodDispatcher.cs:line 119

invoking code:

        var openid = new OpenIdRelyingParty();
        IAuthenticationRequest request = openid.CreateRequest(
            Identifier.Parse(
                GetEndpoint()),
                new Realm(realm),
                new Uri(returnUri));

        // Require some additional data
        request.AddExtension(new ClaimsRequest
        {
            Email = DemandLevel.Require,
            FullName = DemandLevel.Request,
            PostalCode = DemandLevel.Request
        });

        try
        {
            request.RedirectToProvider();
        } catch (ThreadAbortException)
        {
        }

receiving code (and the source of the exception)

        var openId = new OpenIdRelyingParty();
        var response = openId.GetResponse(); <-- exception happens here

what gives? the weird thing is that the yahoo piece was working recently, and i haven't changed the library version...

Answer 1

looks like it's an issue on yahoo's end:

http://groups.google.com/group/dotnetopenid/browse_thread/thread/9e92ff8a7f72c56b/96b0803f1f9337a6?show_docid=96b0803f1f9337a6

3.3.1 handles it.

Answer 2

I think you want to look at your CreateRequest. Also you can't catch ThreadAbortException, it self-propagates. Therefore you need to catch it twice.