inline middleware that does the auth process

inlineauth.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using System;
using System.Net;

public static class BuilderExtensions
{
    public static IApplicationBuilder UseSillyAuthentication(this IApplicationBuilder app,Func<HttpContext,bool> authorizeFunc)
    {
        app.Use(async (context, next) =>
        {
            //Do work to figure out if authorized request
            var authorized = authorizeFunc(context);
            if (authorized)
            {
                await next();
            }
            else
            {
                context.Response.StatusCode = (int)HttpStatusCode.Forbidden;
                await context.Response.WriteAsync("Today is not the day to call this api");
            }
        });
        return app;
    }
}
public class Startup
{
    public void Configure(IApplicationBuilder app)
    {
        app.UseSillyAuthentication(AuthorizeRequest);
        app.Run(async (context) =>
        {
            await context.Response.WriteAsync("Lucky day!!!");
        });
    }

    private bool AuthorizeRequest(HttpContext context)
    {
        //Only authorize requests when the day of the week is even
        //because reasons
        return (int)DateTime.Now.DayOfWeek % 2 == 0;
    }
}