started adding authentication stack, thing that decides if we should be authenticated is in

src/Ocelot.Library/Infrastructure/Authentication/CouldNotFindConfigurationError.cs

@@ -0,0 +1,11 @@
+namespace Ocelot.Library.Infrastructure.Authentication
+{
+    using Responses;
+    public class CouldNotFindConfigurationError : Error
+    {
+        public CouldNotFindConfigurationError(string message) 
+            : base(message)
+        {
+        }
+    }
+}

src/Ocelot.Library/Infrastructure/Authentication/IRouteRequiresAuthentication.cs

@@ -0,0 +1,10 @@
+namespace Ocelot.Library.Infrastructure.Authentication
+{
+    using DownstreamRouteFinder;
+    using Responses;
+
+    public interface IRouteRequiresAuthentication
+    {
+        Response<bool> IsAuthenticated(DownstreamRoute downstreamRoute, string httpMethod);
+    }
+}

src/Ocelot.Library/Infrastructure/Authentication/RouteRequiresAuthentication.cs

@@ -0,0 +1,35 @@
+namespace Ocelot.Library.Infrastructure.Authentication
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using Configuration;
+    using DownstreamRouteFinder;
+    using Responses;
+
+    public class RouteRequiresAuthentication : IRouteRequiresAuthentication
+    {
+        private readonly IOcelotConfiguration _configuration;
+
+        public RouteRequiresAuthentication(IOcelotConfiguration configuration)
+        {
+            _configuration = configuration;
+        }
+
+        public Response<bool> IsAuthenticated(DownstreamRoute downstreamRoute, string httpMethod)
+        {
+            var reRoute =
+                _configuration.ReRoutes.FirstOrDefault(
+                    x =>
+                        x.DownstreamTemplate == downstreamRoute.DownstreamUrlTemplate &&
+                        string.Equals(x.UpstreamHttpMethod, httpMethod, StringComparison.CurrentCultureIgnoreCase));
+
+            if (reRoute == null)
+            {
+                return new ErrorResponse<bool>(new List<Error> {new CouldNotFindConfigurationError($"Could not find configuration for {downstreamRoute.DownstreamUrlTemplate} using method {httpMethod}")});
+            }
+
+            return new OkResponse<bool>(reRoute.IsAuthenticated);
+        }
+    }
+}

src/Ocelot.Library/Infrastructure/Configuration/OcelotConfiguration.cs

@@ -43,7 +43,9 @@ namespace Ocelot.Library.Infrastructure.Configuration
 
                 upstreamTemplate = $"{upstreamTemplate}{RegExMatchEndString}";
 
-                _reRoutes.Add(new ReRoute(reRoute.DownstreamTemplate, reRoute.UpstreamTemplate, reRoute.UpstreamHttpMethod, upstreamTemplate));
+                var isAuthenticated = !string.IsNullOrEmpty(reRoute.Authentication);
+
+                _reRoutes.Add(new ReRoute(reRoute.DownstreamTemplate, reRoute.UpstreamTemplate, reRoute.UpstreamHttpMethod, upstreamTemplate, isAuthenticated));
             }   
         }
 

src/Ocelot.Library/Infrastructure/Configuration/ReRoute.cs

@@ -2,17 +2,19 @@
 {
     public class ReRoute
     {
-        public ReRoute(string downstreamTemplate, string upstreamTemplate, string upstreamHttpMethod, string upstreamTemplatePattern)
+        public ReRoute(string downstreamTemplate, string upstreamTemplate, string upstreamHttpMethod, string upstreamTemplatePattern, bool isAuthenticated)
         {
             DownstreamTemplate = downstreamTemplate;
             UpstreamTemplate = upstreamTemplate;
             UpstreamHttpMethod = upstreamHttpMethod;
             UpstreamTemplatePattern = upstreamTemplatePattern;
+            IsAuthenticated = isAuthenticated;
         }
 
         public string DownstreamTemplate { get; private set; }
         public string UpstreamTemplate { get; private set; }
         public string UpstreamTemplatePattern { get; private set; }
         public string UpstreamHttpMethod { get; private set; }
+        public bool IsAuthenticated { get; private set; }
     }
 }

src/Ocelot.Library/Infrastructure/Configuration/Yaml/YamlReRoute.cs

@@ -5,5 +5,6 @@
         public string DownstreamTemplate { get; set; }
         public string UpstreamTemplate { get; set; }
         public string UpstreamHttpMethod { get; set; }
+        public string Authentication { get; set; }
     }
 }

src/Ocelot.Library/Middleware/AuthenticationMiddleware.cs

@@ -0,0 +1,54 @@
+namespace Ocelot.Library.Middleware
+{
+    using System.Threading.Tasks;
+    using Infrastructure.Authentication;
+    using Infrastructure.DownstreamRouteFinder;
+    using Infrastructure.Repository;
+    using Infrastructure.Responses;
+    using Microsoft.AspNetCore.Http;
+
+    public class AuthenticationMiddleware : OcelotMiddleware
+    {
+        private readonly RequestDelegate _next;
+        private readonly IScopedRequestDataRepository _scopedRequestDataRepository;
+        private readonly IRouteRequiresAuthentication _requiresAuthentication;
+        public AuthenticationMiddleware(RequestDelegate next, 
+            IScopedRequestDataRepository scopedRequestDataRepository, 
+            IRouteRequiresAuthentication requiresAuthentication) 
+            : base(scopedRequestDataRepository)
+        {
+            _next = next;
+            _scopedRequestDataRepository = scopedRequestDataRepository;
+            _requiresAuthentication = requiresAuthentication;
+        }
+
+        public async Task Invoke(HttpContext context)
+        {
+            var downstreamRoute = _scopedRequestDataRepository.Get<DownstreamRoute>("DownstreamRoute");
+
+            var isAuthenticated = _requiresAuthentication.IsAuthenticated(downstreamRoute.Data, context.Request.Method);
+
+            if (isAuthenticated.IsError)
+            {
+                SetPipelineError(downstreamRoute.Errors);
+                return;
+            }
+
+            if (IsAuthenticatedRoute(isAuthenticated))
+            {
+                //todo - build auth pipeline and then call normal pipeline if all good?
+                await _next.Invoke(context);
+            }
+            else
+            {
+                await _next.Invoke(context);
+            }
+
+        }
+
+        private static bool IsAuthenticatedRoute(Response<bool> isAuthenticated)
+        {
+            return isAuthenticated.Data;
+        }
+    }
+}

src/Ocelot.Library/Middleware/AuthenticationMiddlewareMiddlewareExtensions.cs

@@ -0,0 +1,12 @@
+using Microsoft.AspNetCore.Builder;
+
+namespace Ocelot.Library.Middleware
+{
+    public static class AuthenticationMiddlewareMiddlewareExtensions
+    {
+        public static IApplicationBuilder UseAuthenticationMiddleware(this IApplicationBuilder builder)
+        {
+            return builder.UseMiddleware<AuthenticationMiddleware>();
+        }
+    }
+}

src/Ocelot.Library/Middleware/DownstreamUrlCreatorMiddleware.cs

@@ -2,7 +2,6 @@ using System.Threading.Tasks;
 using Microsoft.AspNetCore.Http;
 using Ocelot.Library.Infrastructure.DownstreamRouteFinder;
 using Ocelot.Library.Infrastructure.Repository;
-using Ocelot.Library.Infrastructure.Responder;
 using Ocelot.Library.Infrastructure.UrlTemplateReplacer;
 
 namespace Ocelot.Library.Middleware

src/Ocelot.Library/Middleware/DownstreamUrlCreatorMiddlewareExtensions.cs

@@ -4,7 +4,7 @@ namespace Ocelot.Library.Middleware
 {
     public static class DownstreamUrlCreatorMiddlewareExtensions
     {
-        public static IApplicationBuilder UserDownstreamUrlCreatorMiddleware(this IApplicationBuilder builder)
+        public static IApplicationBuilder UseDownstreamUrlCreatorMiddleware(this IApplicationBuilder builder)
         {
             return builder.UseMiddleware<DownstreamUrlCreatorMiddleware>();
         }

src/Ocelot/Startup.cs

@@ -20,6 +20,8 @@ using Ocelot.Library.Middleware;
 
 namespace Ocelot
 {
+    using Library.Infrastructure.Authentication;
+
     public class Startup
     {
         public Startup(IHostingEnvironment env)
@@ -52,6 +54,7 @@ namespace Ocelot
             services.AddSingleton<IHttpRequester, HttpClientHttpRequester>();
             services.AddSingleton<IHttpResponder, HttpContextResponder>();
             services.AddSingleton<IRequestBuilder, HttpRequestBuilder>();
+            services.AddSingleton<IRouteRequiresAuthentication, RouteRequiresAuthentication>();
 
             // see this for why we register this as singleton http://stackoverflow.com/questions/37371264/invalidoperationexception-unable-to-resolve-service-for-type-microsoft-aspnetc
             services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
@@ -69,7 +72,9 @@ namespace Ocelot
 
             app.UseDownstreamRouteFinderMiddleware();
 
-            app.UserDownstreamUrlCreatorMiddleware();
+            app.UseAuthenticationMiddleware();
+
+            app.UseDownstreamUrlCreatorMiddleware();
 
             app.UseHttpRequestBuilderMiddleware();