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POCastle Windsor/DelegatingHandler/IPrincipal Dependency Injection (DI)/Inversion of Control (IoC) in ASP.NET Web API
 

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  1. POCastle Windsor/DelegatingHandler/IPrincipal Dependency Injection (DI)/Inversion of Control (IoC) in ASP.NET Web API
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    <p>I decided to clean this post up and I posted a sample project at <a href="http://ge.tt/3EwoZEd/v/0?c" rel="nofollow">ge.tt/3EwoZEd/v/0?c</a></p> <p>Spent around 30 hours on this already and still can't figure it out... help would be really appreciated!</p> <p>I have an ASP.NET Web API solution that uses this code: <strong><a href="http://www.piotrwalat.net/basic-http-authentication-in-asp-net-web-api-using-message-handlers/" rel="nofollow">http://www.piotrwalat.net/basic-http-authentication-in-asp-net-web-api-using-message-handlers/</a></strong> to implement "Basic HTTP authentication in ASP.NET Web API using Message Handlers". I'm new to IoC/DI and I'm trying to get this to work with Castle Windsor.</p> <p>I've been trying a lot of different things but I get 1 of the following errors depending on what I did wrong:</p> <ul> <li>"Looks like you forgot to register the http module Castle.MicroKernel.Lifestyle.PerWebRequestLifestyleModule"</li> <li>"Object reference not set to an instance of an object." for the PrincipalProvider in BasicAuthMessageHandler</li> <li>"No component for supporting the service *.DummyPrincipalProvider was found"</li> </ul> <p>Below is my code:</p> <hr> <p><strong>Global.asax.cs:</strong></p> <pre><code>private static IWindsorContainer _container; protected void Application_Start() { AreaRegistration.RegisterAllAreas(); WebApiConfig.Register(GlobalConfiguration.Configuration); FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters); RouteConfig.RegisterRoutes(RouteTable.Routes); BundleConfig.RegisterBundles(BundleTable.Bundles); var config = (CustomErrorsSection)ConfigurationManager.GetSection("system.web/customErrors"); IncludeErrorDetailPolicy errorDetailPolicy; switch (config.Mode) { case CustomErrorsMode.RemoteOnly: errorDetailPolicy = IncludeErrorDetailPolicy.LocalOnly; break; case CustomErrorsMode.On: errorDetailPolicy = IncludeErrorDetailPolicy.Never; break; case CustomErrorsMode.Off: errorDetailPolicy = IncludeErrorDetailPolicy.Always; break; default: throw new ArgumentOutOfRangeException(); } GlobalConfiguration.Configuration.IncludeErrorDetailPolicy = errorDetailPolicy; ConfigureWindsor(GlobalConfiguration.Configuration); GlobalConfiguration.Configuration.MessageHandlers.Add(new BasicAuthMessageHandler() { PrincipalProvider = _container.Resolve&lt;IProvidePrincipal&gt;() }); } public static void ConfigureWindsor(HttpConfiguration configuration) { // Create / Initialize the container _container = new WindsorContainer(); // Find our IWindsorInstallers from this Assembly and optionally from our DI assembly which is in abother project. _container.Install(FromAssembly.This()); _container.Kernel.Resolver.AddSubResolver(new CollectionResolver(_container.Kernel, true)); //Documentation http://docs.castleproject.org/Windsor.Typed-Factory-Facility.ashx // Set the WebAPI DependencyResolver to our new WindsorDependencyResolver var dependencyResolver = new WindsorDependencyResolver(_container); configuration.DependencyResolver = dependencyResolver; } </code></pre> <hr> <p><strong>Windsor Installer:</strong></p> <pre><code>public class PrincipalsInstaller : IWindsorInstaller { public void Install(IWindsorContainer container, IConfigurationStore store) { container.Register(Classes.FromThisAssembly().BasedOn&lt;DelegatingHandler&gt;()); container.Register( Component.For&lt;IProvidePrincipal&gt;().ImplementedBy&lt;DummyPrincipalProvider&gt;() ); } } </code></pre> <hr> <p><strong>Modified DummyPrincipalProvider (from the original I got from the <a href="http://www.piotrwalat.net/basic-http-authentication-in-asp-net-web-api-using-message-handlers/" rel="nofollow">URL above</a>):</strong></p> <pre><code>public class DummyPrincipalProvider : IProvidePrincipal { private IUserRepository _userRepo; public DummyPrincipalProvider(IUserRepository userRepo) { this._userRepo = userRepo; } public IPrincipal CreatePrincipal(string username, string password) { try { if (!this._userRepo.ValidateUser(username, password)) { return null; } else { var identity = new GenericIdentity(username); IPrincipal principal = new GenericPrincipal(identity, new[] { "User" }); if (!identity.IsAuthenticated) { throw new ApplicationException("Unauthorized"); } return principal; } } catch { return null; } } } </code></pre> <hr> <p><strong>WindsorDependencyResolver.cs:</strong></p> <pre><code>internal sealed class WindsorDependencyResolver : IDependencyResolver { private readonly IWindsorContainer _container; public WindsorDependencyResolver(IWindsorContainer container) { if (container == null) { throw new ArgumentNullException("container"); } _container = container; } public object GetService(Type t) { return _container.Kernel.HasComponent(t) ? _container.Resolve(t) : null; } public IEnumerable&lt;object&gt; GetServices(Type t) { return _container.ResolveAll(t).Cast&lt;object&gt;().ToArray(); } public IDependencyScope BeginScope() { return new WindsorDependencyScope(_container); } public void Dispose() { } } </code></pre> <hr> <p><strong>WindsorDependencyScope.cs:</strong></p> <pre><code>internal sealed class WindsorDependencyScope : IDependencyScope { private readonly IWindsorContainer _container; private readonly IDisposable _scope; public WindsorDependencyScope(IWindsorContainer container) { if (container == null) { throw new ArgumentNullException("container"); } _container = container; _scope = container.BeginScope(); } public object GetService(Type t) { return _container.Kernel.HasComponent(t) ? _container.Resolve(t) : null; } public IEnumerable&lt;object&gt; GetServices(Type t) { return _container.ResolveAll(t).Cast&lt;object&gt;().ToArray(); } public void Dispose() { _scope.Dispose(); } } </code></pre>
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