How do I parse a signed request in Facebook C# SDK?

Question

I'm trying to create a FB credits callback page, and need to parse the signed request coming in. I can write something manually, but it seems like this is something that should be in the SDK somewhere but I can't seem to find it in the API.

Answer 1

Simply call the static method Parse on the FacebookSignedRequest class as shown below (with your app secret, and the signed request):

var DecodedSignedRequest = FacebookSignedRequest.Parse(FacebookContext.Current.AppSecret, SignedRequest);

Now you will see all the data (in JSON format) from the signed request in DecodedSignedRequest.

Answer 2

Starting from v6:

var fb = new FacebookClient();
dynamic signedRequest = fb.ParseSignedRequest("app_secret", Request.Params["signed_request"]);