reorganised project so its a bit more vertical for features

src/Ocelot.Library/Authentication/Handler/Creator/AuthenticationHandlerCreator.cs

@@ -0,0 +1,34 @@
+using IdentityServer4.AccessTokenValidation;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Http;
+using Ocelot.Library.Responses;
+
+namespace Ocelot.Library.Authentication.Handler.Creator
+{
+    using AuthenticationOptions = Configuration.AuthenticationOptions;
+
+    /// <summary>
+    /// Cannot unit test things in this class due to use of extension methods
+    /// </summary>
+    public class AuthenticationHandlerCreator : IAuthenticationHandlerCreator
+    {
+        public Response<RequestDelegate> CreateIdentityServerAuthenticationHandler(IApplicationBuilder app, AuthenticationOptions authOptions)
+        {
+            var builder = app.New();
+
+            builder.UseIdentityServerAuthentication(new IdentityServerAuthenticationOptions
+            {
+                Authority = authOptions.ProviderRootUrl,
+                ScopeName = authOptions.ScopeName,
+                RequireHttpsMetadata = authOptions.RequireHttps,
+                AdditionalScopes = authOptions.AdditionalScopes,
+                SupportedTokens = SupportedTokens.Both,
+                ScopeSecret = authOptions.ScopeSecret
+            });
+
+            var authenticationNext = builder.Build();
+
+            return new OkResponse<RequestDelegate>(authenticationNext);
+        }
+    }
+}