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ASP.NET Core- Customize authorization responses with IAuthorizationMiddlewareResultHandler

One of my ASP.NET Core applications hosts both an API and a website. There are multiple places where authentication and authorizaton rules are checked:

  • In the Accountcontroller Login Action method
  • In a custom AuthorizationHandler
  • In a custom IAuthorizationFilter

Remark: Don’t ask me why we have all these places, that is maybe something for another blog post.

Recently I had to make a change to the application so that depending if the request was coming from the website or through the API, a different message was returned when authorization failed. I didn’t like the idea that I had to implement the same change 3 times, so I started to search for a better solution…

The solution

I found the solution in the implementation of the IAuthorizationMiddlewareResultHandler. By implementing this middleware, you can:

  • Return customized responses.
  • Enhance the default challenge or forbid responses.

That is exactly what we need!. Here is a simplified example:

Register this middleware in your ASP.NET Core Program.cs file:

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