Adding Azure Active Directory OAuth 2.0 authentication to a Service Fabric Web API (Stateless) service

... is pretty much the same as adding it to a normal Web API 2.0 application:

[Authorize]
public class ValuesController : ApiController
{

        }

Then in your Startup.cs file:

// This code configures Web API. The Startup class is specified as a type

// parameter in the WebApp.Start method.

public static void ConfigureApp(IAppBuilder appBuilder)

{

CodePackageActivationContext activationContext = FabricRuntime.GetActivationContext();

ConfigurationPackage configurationPackageObject = activationContext.GetConfigurationPackageObject("Config");

ConfigurationSection configurationSection = configurationPackageObject.Settings.Sections["ActiveDirectoryServiceConfigSection"];

appBuilder.UseWindowsAzureActiveDirectoryBearerAuthentication(

new WindowsAzureActiveDirectoryBearerAuthenticationOptions

{

Tenant = configurationSection.Parameters["TenantName"].Value,

TokenValidationParameters = new TokenValidationParameters

{

ValidAudience = configurationSection.Parameters["AppIdUri"].Value

},

Provider = new OAuthBearerAuthenticationProvider

{

OnValidateIdentity = OnValidateUserIdentityAsync

}

});

// Configure Web API for self-host. 

HttpConfiguration config = new HttpConfiguration();

config.Routes.MapHttpRoute(

name: "DefaultApi",

routeTemplate: "api/{controller}/{id}",

defaults: new { id = RouteParameter.Optional }

);

appBuilder.UseWebApi(config);

}

The trick here is to ** ENSURE THAT WAAD BEARER AUTHENTICATION GETS REGISTERED BEFORE REGISTERING WEB API!!! **