问题
I'm attempting to use DotNetOpenAuth for some web single sign on functionality.
I got the samples working for Google and Yahoo but am struggling with Facebook.
I am using the CTP (4.0.0.11165) and have followed the example in this SO question.
However, I get a runtime error on the line:
IAuthorizationState authorization = client.ProcessUserAuthorization();
The error is:
Failed to obtain access token. Authorization Server reports reason: (unknown)
Any ideas?
回答1:
The build you're using is incompatible with Facebook because Facebook is using an older spec of OAuth 2.0. You have to use an earlier CTP (one with a v3.5 version) to work with Facebook. Sorry. It stinks to be using OAuth 2.0 when everyone is on a different draft of the unfinalized spec.
回答2:
I was facing the similar issue while using https://github.com/baio/open-mvc .
I resolved it by building again the DotNetOpenAuth.ApplicationBlock project of Latest CTP(4.0.0.11165) with DotNetOpenAuth version 3.5.0.10357 downloaded from open-mvc repo.
And it worked fine for facebook.
I am still testing it for other IDP's
回答3:
I think you need to add
client.ClientCredentialApplicator = ClientCredentialApplicator.PostParameter("App_Secret");
来源：https://stackoverflow.com/questions/6666447/dotnetopenauth-and-facebook