Get IPrincipal from OAuth Bearer Token in OWIN

Question

I have successfully added OAuth to my WebAPI 2 project using OWIN. I receive tokens and can use them in the HTTP Header to access resources.

Now I want to use those

Answer 1

in addition to johnny-qian answer, using this method is better to create DataProtector. johnny-qian answer, depends on IIS and fails on self-hosted scenarios.

using Microsoft.Owin.Security.DataProtection;
var dataProtector = app.CreateDataProtector(new string[]   {
     typeof(OAuthAuthorizationServerMiddleware).Namespace,
     "Access_Token",
     "v1"
});