OWIN Oauth differentiate expired and invalid token - asp.net

Question

I use OWIN Oauth in my ASP.NET MVC application to provide access token for mobile applications. Here's the setup of OAuth:
app.UseOAuthAuthorizationServer(new OAuthAuthorizationServerOptions
{
TokenEndpointPath = new PathString("/api/authenticate/login"),
Provider = dependencyContainer.GetService<IOAuthAuthorizationServerProvider>(),
RefreshTokenProvider = dependencyContainer.GetService<IAuthenticationTokenProvider>(),
AccessTokenExpireTimeSpan = TimeSpan.FromMinutes(applicationSettings.AccessTokenLifeTimeInMinutes),
AllowInsecureHttp = true
});
app.UseOAuthBearerAuthentication(new OAuthBearerAuthenticationOptions());
I also have custom provider and custom refresh token provider as you can see above. Everything is working fine, when a request from mobile is expired or invalid, I use a custom AuthorizeAttribute to return a json with message "unauthorized"
public class ApiAuthorizeAttribute : AuthorizeAttribute
{
protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext)
{
filterContext.Result = new JsonResult
{
Data = new
{
success = false,
error = "Unauthorized"
},
JsonRequestBehavior = JsonRequestBehavior.AllowGet
};
}
}
However in one scenario, the mobile applications need to differentiate the response from server for 2 cases: access token is expired, or access token is invalid (.e.g. modified in the middle). I'm not sure how I can implement that requirement. I tried to create a custom access token provider, inheriting from AuthenticationTokenProvider, register it in UseOAuthAuthorizationServer() above, but both Receive() and ReceiveAsync() are not called when server receives access token from mobile

Answer 1

Solved the issue. My approach of creating custom access token provider works. Initially I registered it with UseOAuthAuthorizationServer(), but it should be registered using UseOAuthBearerAuthentication() instead
Here's my custom class, in case anyone needs:
public class CustomAccessTokenProvider : AuthenticationTokenProvider
{
public override void Receive(AuthenticationTokenReceiveContext context)
{
context.DeserializeTicket(context.Token);
var expired = context.Ticket.Properties.ExpiresUtc < DateTime.UtcNow;
if (expired)
{
//If current token is expired, set a custom response header
context.Response.Headers.Add("X-AccessTokenExpired", new string[] { "1" });
}
base.Receive(context);
}
}
Register it when setting up OWIN OAuth:
app.UseOAuthBearerAuthentication(new OAuthBearerAuthenticationOptions
{
AccessTokenProvider = new CustomAccessTokenProvider()
});