The Kentor AuthServices Owin middleware is designed to be used with an Owin authentication pipeline and is compatible with ASP.NET Identity. Kentor AuthServices provides external login in the same way as the built in Google, Facebook and Twitter providers.
To use the Kentor AuthServices middleware, it need to be configured in
Startup.Auth.Cs.
app.UseKentorAuthServicesAuthentication(new KentorAuthServicesAuthenticationOptions());
The options class only contains the owin specific configuration (such as the name used to identify the login provider). The rest of the configuration is read from the web.config/app.config and configured in the same way as when using the http module or the MVC controller.
##Selecting Idp An Owin based application issues a AuthenticationResponseChallenge to ask the middleware to begin the authentication procedure. In that challenge, there is a properties dictionary. To use a specified idp, the entity id of the idp should be entered in that dictionary under the key "idp".
In a typical MVC application that requires some changes to the generated code
to enable passing a property to the AuthenticationProperties dictionary.
Another, more simple way to pass a value is to put it directly in the Owin environment dictionary under the key "KentorAuthServices.idp".
Here's an example of how to set the Owin environment value through ASP.NET MVC
var context = HttpContext.GetOwinContext();
context.Environment.Add("KentorAuthServices.idp", new EntityId(YOUR_IDP_ENTITY_ID));