Injecting a class into an authentication attribute using Unity 2 and MVC 3

Question

I read a number of articles that indicate how to do this, namely:

Decision

Great Brad Wilsons Tutorial

It really works well, however, when I follow some recommendations here

Securing an ASP.NET MVC 3 Application

I think I'm coming. The problem for me is that I am adding my AuthorizationAttribute attribute as GlobalFilter, and not just decorating the controller / action. Although it seems that the calling dependencies are called and set the Public Public [Dependancy] property when it really is part of the code where I override the OnAuthorization () AuthorizeAttribute method, my public [Dependency] attribute is null.

When I remove it from the global filter and decorate the controller, it works.

I can send the code if additional information is required.

EDIT: To further expand on this, here is part of my code:

Global.asax.cs

public static void RegisterGlobalFilters(GlobalFilterCollection filters) { // If I have this here the my [Dependency] attribute does not keep it value // If I remove it and decorate the controller the [Dependency] attribute keeps it value filters.Add(new BasicAuthenticationAttribute()); filters.Add(new HandleErrorAttribute()); } protected void Application_Start() { AreaRegistration.RegisterAllAreas(); RegisterGlobalFilters(GlobalFilters.Filters); RegisterRoutes(RouteTable.Routes); // injection of services and data contexts var container = new UnityContainer(); // injections for services RegisterUnityServices(container); // Filter provides to allow injection into attribute filters RegisterUnityFilters(container); } private void RegisterUnityServices(UnityContainer container) { container.RegisterType<IDataContext, CDAXDataContext>(); container.RegisterType<IUploadService, UploadService>(); container.RegisterType<IAuthenticationService, AuthenticationService>(); // add more services here ... DependencyResolver.SetResolver(new Models.UnityDependencyResolver(container)); } private void RegisterUnityFilters(UnityContainer container) { var oldProvider = FilterProviders.Providers.Single(f => f is FilterAttributeFilterProvider); FilterProviders.Providers.Remove(oldProvider); var provider = new UnityFilterAttributeFilterProvider(container); FilterProviders.Providers.Add(provider); } 

My Unity classes taken from brad wilsons examples:

  public class UnityDependencyResolver : IDependencyResolver { readonly IUnityContainer _container; public UnityDependencyResolver(IUnityContainer container) { this._container = container; } public object GetService(Type serviceType) { try { return _container.Resolve(serviceType); } catch { return null; } } public IEnumerable<object> GetServices(Type serviceType) { try { return _container.ResolveAll(serviceType); } catch { return new List<object>(); } } } 

and

  public class UnityFilterAttributeFilterProvider : FilterAttributeFilterProvider { private IUnityContainer _container; public UnityFilterAttributeFilterProvider(IUnityContainer container) { _container = container; } public override IEnumerable<Filter> GetFilters(ControllerContext controllerContext, ActionDescriptor actionDescriptor) { var filters = base.GetFilters(controllerContext, actionDescriptor); foreach (var filter in filters) { _container.BuildUp(filter.Instance); } return filters; } protected override IEnumerable<FilterAttribute> GetControllerAttributes( ControllerContext controllerContext, ActionDescriptor actionDescriptor) { var attributes = base.GetControllerAttributes(controllerContext, actionDescriptor); foreach (var attribute in attributes) { _container.BuildUp(attribute.GetType(), attribute); } return attributes; } protected override IEnumerable<FilterAttribute> GetActionAttributes( ControllerContext controllerContext, ActionDescriptor actionDescriptor) { var attributes = base.GetActionAttributes(controllerContext, actionDescriptor); foreach (var attribute in attributes) { _container.BuildUp(attribute.GetType(), attribute); } return attributes; } } 

And the basis of My BasicAuthenticationAttribute, where I have the [Dependency] property set, but not supporting the value when running the OnAuthorization method.

  public class BasicAuthenticationAttribute : AuthorizeAttribute { [Dependency] public IAuthenticationService Authentication { get; set; } private void CacheValidateHandler(HttpContext context, object data, ref HttpValidationStatus validationStatus) { validationStatus = OnCacheAuthorization(new HttpContextWrapper(context)); } public override void OnAuthorization(AuthorizationContext filterContext) { // code here that uses the Authentication attribute but it null } 

Answer 1

Have you decided this? I think you need to call DependencyResolver in the attribute class ... Not sure if the [Dependency] attribute works here ... so in calling the OnAuthorization method IAuthenticationService authentication = DependencyResolver.Current.GetService<IAuthenticationService>();