title: How to test if a user has a role within a service implementation in ServiceStack
body: <p>I know I can add the RequiresAnyRole or RequiresRole attribute on my service:</p>
  
  <pre><code>    [RequiresAnyRole("Admin", "HeadChaperone")]
      public GuestChaperoneResponse Delete(DeleteGuestChaperone request)
      {
          bool hasHeadChaperoneRole = ??
      }
  </code></pre>
  
  <p>But how can I test within the service implementation if the user has a certain role?</p>