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src/Yavsc/AuthorizationHandlers/BillViewHandlers.cs

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+using System.Security.Claims;
+using Microsoft.AspNet.Authorization;
+
+namespace Yavsc.ViewModels.Auth.Handlers
+{
+    using Billing;
+
+    public class BillViewHandler : AuthorizationHandler<ViewRequirement, IBillable>
+    {
+        protected override void Handle(AuthorizationContext context, ViewRequirement requirement, IBillable resource)
+        {
+            if (context.User.IsInRole("FrontOffice"))
+                context.Succeed(requirement);
+            else if (context.User.Identity.IsAuthenticated)
+            if (resource.ClientId == context.User.GetUserId())
+                context.Succeed(requirement);
+            else if (resource.PerformerId == context.User.GetUserId())
+                context.Succeed(requirement);
+        }
+
+    }
+}