DotNetOpenAuth and Facebook

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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?

Droll answered 12/7, 2011 at 15:7 Comment(0)

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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.

Carincarina answered 13/7, 2011 at 4:56 Comment(6)

I downloaded the ctp and can't find samples for fb in there? i have the master branch and it does. but you're saying they won't work. Should I expect to see samples in the ctp for fb? – Sink 9/9, 2011 at 14:21

Also, if i use this ctp version, will i find myself in a strange place further down the line? are fb planning on coming in line with everyone else at some point? – Sink 9/9, 2011 at 14:24

I can't speak for Facebook, but I can only imagine that they'll adopt the final version of OAuth 2.0 when it is (finally) finalized. The earlier version of the DNOA CTP that does interop with FB does include a facebook sample, yes. – Carincarina 11/9, 2011 at 5:7

the one on the download doesn't: sourceforge.net/projects/dnoa/files/releases/v3.4/v3.4.7/… – Sink 13/9, 2011 at 8:44

Andrew, is this still actual? Getting similar exception while using DNOA version 4.0.0 – Beverleebeverley 12/3, 2013 at 17:59

DNOA 4.0.0 is pretty old too. I don't remember whether that should work with Facebook. But the latest version should work (4.2.2, IIRC) – Carincarina 13/3, 2013 at 2:50

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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

Cheryle answered 20/1, 2012 at 11:59 Comment(0)

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I think you need to add

client.ClientCredentialApplicator = ClientCredentialApplicator.PostParameter("App_Secret");

Madalinemadalyn answered 30/6, 2013 at 19:4 Comment(0)

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