AuthenticationSuccessMarkerMiddleware.cs

namespace SampleApi.Middleware
{
    using System;
    using System.Threading.Tasks;
    using Microsoft.AspNet.Builder;
    using Microsoft.AspNet.Http;
    using Microsoft.Extensions.Logging;

    public class AuthenticationSuccessMarkerMiddleware
    {
        private const string SuccessMarkerKey = AuthenticationExceptionHandlerMiddleware.SuccessMarkerKey;

        private readonly RequestDelegate next;
        private readonly ILogger<AuthenticationSuccessMarkerMiddleware> logger;

        public AuthenticationSuccessMarkerMiddleware(
            RequestDelegate next,
            ILogger<AuthenticationSuccessMarkerMiddleware> logger)
        {
            if (next == null)
            {
                throw new ArgumentNullException(nameof(next));
            }

            if (logger == null)
            {
                throw new ArgumentNullException(nameof(logger));
            }

            this.next = next;
            this.logger = logger;
        }

        public Task Invoke(HttpContext context)
        {
            // Set success marker to true
            this.logger.LogInformation("Marking authentication as successful");
            context.Items[SuccessMarkerKey] = true;

            // Continue pipeline
            return this.next.Invoke(context);
        }
    }
}