What are authorization filters in ASP.NET Core?

What are authorization filters in ASP.NET Core?

Authorization filters in ASP.NET Core are used to enforce security policies on actions or controllers. They determine whether a user is authorized to access a resource.

How do I implement a custom authorization filter?

To implement a custom authorization filter, you can create a class that implements the IAuthorizationFilter interface and override the OnAuthorization method.

Can you give me an example of a custom authorization filter?

Sure! Here's a simple example:

public class CustomAuthorizationFilter : IAuthorizationFilter
{
    public void OnAuthorization(AuthorizationFilterContext context)
    {
        // Your authorization logic here
        if (!context.HttpContext.User.Identity.IsAuthenticated)
        {
            context.Result = new UnauthorizedResult();
        }
    }
}

How do I apply this filter to a controller?

You can apply the filter by using the [ServiceFilter] or [TypeFilter] attribute on your controller or action method, like this:

[ServiceFilter(typeof(CustomAuthorizationFilter))]
public class MyController : Controller
{
    // Actions here
}