Rename Microsoft.AspNet.* packages folders to Microsoft.AspNetCore.*

src/Microsoft.AspNetCore.SpaServices/Webpack/WebpackDevMiddleware.cs

@@ -0,0 +1,75 @@
+using System;
+using System.IO;
+using System.Threading.Tasks;
+using Microsoft.AspNet.NodeServices;
+using Microsoft.AspNet.SpaServices.Webpack;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.PlatformAbstractions;
+using Newtonsoft.Json;
+
+// Putting in this namespace so it's always available whenever MapRoute is
+namespace Microsoft.AspNetCore.Builder
+{
+    public static class WebpackDevMiddleware
+    {
+        const string WebpackDevMiddlewareScheme = "http";
+        const string WebpackDevMiddlewareHostname = "localhost";
+        const string WebpackHotMiddlewareEndpoint = "/__webpack_hmr";
+        const string DefaultConfigFile = "webpack.config.js";
+
+        public static void UseWebpackDevMiddleware(this IApplicationBuilder appBuilder, WebpackDevMiddlewareOptions options = null) {
+            // Validate options
+            if (options == null) {
+                options = new WebpackDevMiddlewareOptions();
+            }
+            if (options.ReactHotModuleReplacement && !options.HotModuleReplacement) {
+                throw new ArgumentException("To enable ReactHotModuleReplacement, you must also enable HotModuleReplacement.");
+            }
+
+            // Unlike other consumers of NodeServices, WebpackDevMiddleware dosen't share Node instances, nor does it
+            // use your DI configuration. It's important for WebpackDevMiddleware to have its own private Node instance
+            // because it must *not* restart when files change (if it did, you'd lose all the benefits of Webpack
+            // middleware). And since this is a dev-time-only feature, it doesn't matter if the default transport isn't
+            // as fast as some theoretical future alternative.
+            var hostEnv = (IHostingEnvironment)appBuilder.ApplicationServices.GetService(typeof (IHostingEnvironment));
+            var nodeServices = Configuration.CreateNodeServices(new NodeServicesOptions {
+                HostingModel = NodeHostingModel.Http,
+                ProjectPath = hostEnv.ContentRootPath,
+                WatchFileExtensions = new string[] {} // Don't watch anything
+            });
+
+            // Get a filename matching the middleware Node script
+            var script = EmbeddedResourceReader.Read(typeof (WebpackDevMiddleware), "/Content/Node/webpack-dev-middleware.js");
+            var nodeScript = new StringAsTempFile(script); // Will be cleaned up on process exit
+
+            // Tell Node to start the server hosting webpack-dev-middleware
+            var devServerOptions = new {
+                webpackConfigPath = Path.Combine(hostEnv.ContentRootPath, options.ConfigFile ?? DefaultConfigFile),
+                suppliedOptions = options
+            };
+            var devServerInfo = nodeServices.InvokeExport<WebpackDevServerInfo>(nodeScript.FileName, "createWebpackDevServer", JsonConvert.SerializeObject(devServerOptions)).Result;
+
+            // Proxy the corresponding requests through ASP.NET and into the Node listener
+            var proxyOptions = new ConditionalProxyMiddlewareOptions(WebpackDevMiddlewareScheme, WebpackDevMiddlewareHostname, devServerInfo.Port.ToString());
+            appBuilder.UseMiddleware<ConditionalProxyMiddleware>(devServerInfo.PublicPath, proxyOptions);
+
+            // While it would be nice to proxy the /__webpack_hmr requests too, these return an EventStream,
+            // and the Microsoft.Aspnet.Proxy code doesn't handle that entirely - it throws an exception after
+            // a while. So, just serve a 302 for those.
+            appBuilder.Map(WebpackHotMiddlewareEndpoint, builder => {
+                builder.Use(next => async ctx => {
+                    ctx.Response.Redirect($"{ WebpackDevMiddlewareScheme }://{ WebpackDevMiddlewareHostname }:{ devServerInfo.Port.ToString() }{ WebpackHotMiddlewareEndpoint }");
+                    await Task.Yield();
+                });
+            });
+        }
+
+        #pragma warning disable CS0649
+        class WebpackDevServerInfo {
+            public int Port;
+            public string PublicPath;
+        }
+        #pragma warning restore CS0649
+    }
+}