Flow configuration via IHostingEnvironment

src/Microsoft.AspNet.Hosting.Abstractions/IHostingEnvironment.cs

@@ -2,6 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using Microsoft.AspNet.FileProviders;
+using Microsoft.Extensions.Configuration;
 
 namespace Microsoft.AspNet.Hosting
 {
@@ -28,5 +29,10 @@ namespace Microsoft.AspNet.Hosting
         /// </summary>
         // This must be settable!
         IFileProvider WebRootFileProvider { get; set; }
+
+        /// <summary>
+        /// Gets or sets the configuration object used by hosting environment.
+        /// </summary>
+        IConfiguration Configuration { get; set; }
     }
 }

src/Microsoft.AspNet.Hosting.Abstractions/project.json

@@ -11,7 +11,8 @@
   },
   "dependencies": {
     "Microsoft.AspNet.Http.Abstractions": "1.0.0-*",
-    "Microsoft.AspNet.FileProviders.Abstractions": "1.0.0-*"
+    "Microsoft.AspNet.FileProviders.Abstractions": "1.0.0-*",
+    "Microsoft.Extensions.Configuration.Abstractions": "1.0.0-*"
   },
   "frameworks": {
     "net451": {},

src/Microsoft.AspNet.Hosting/HostingEnvironment.cs

@@ -2,7 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using Microsoft.AspNet.FileProviders;
-using Microsoft.AspNet.Hosting.Internal;
+using Microsoft.Extensions.Configuration;
 
 namespace Microsoft.AspNet.Hosting
 {
@@ -13,5 +13,7 @@ namespace Microsoft.AspNet.Hosting
         public string WebRootPath { get; set; }
 
         public IFileProvider WebRootFileProvider { get; set; }
+
+        public IConfiguration Configuration { get; set; }
     }
 }

src/Microsoft.AspNet.Hosting/HostingEnvironmentExtensions.cs

@@ -10,7 +10,7 @@ namespace Microsoft.AspNet.Hosting
 {
     public static class HostingEnvironmentExtensions
     {
-        public static void Initialize(this IHostingEnvironment hostingEnvironment, string applicationBasePath, WebHostOptions options)
+        public static void Initialize(this IHostingEnvironment hostingEnvironment, string applicationBasePath, WebHostOptions options, IConfiguration configuration)
         {
             if (options == null)
             {
@@ -46,6 +46,8 @@ namespace Microsoft.AspNet.Hosting
 
             var environmentName = options.Environment;
             hostingEnvironment.EnvironmentName = environmentName ?? hostingEnvironment.EnvironmentName;
+
+            hostingEnvironment.Configuration = configuration;
         }
     }
 }

src/Microsoft.AspNet.Hosting/WebHostBuilder.cs

@@ -126,7 +126,7 @@ namespace Microsoft.AspNet.Hosting
             var appEnvironment = hostingContainer.GetRequiredService<IApplicationEnvironment>();
             var startupLoader = hostingContainer.GetRequiredService<IStartupLoader>();
 
-            _hostingEnvironment.Initialize(appEnvironment.ApplicationBasePath, _options);
+            _hostingEnvironment.Initialize(appEnvironment.ApplicationBasePath, _options, _config);
             if (!string.IsNullOrEmpty(_environmentName))
             {
                 _hostingEnvironment.EnvironmentName = _environmentName;

test/Microsoft.AspNet.Hosting.Tests/HostingEngineTests.cs

@@ -144,6 +144,24 @@ namespace Microsoft.AspNet.Hosting
             Assert.Equal("http://localhost:5000", app.ServerFeatures.Get<IServerAddressesFeature>().Addresses.First());
         }
 
+        [Fact]
+        public void FlowsConfig()
+        {
+            var vals = new Dictionary<string, string>
+            {
+                { "Server", "Microsoft.AspNet.Hosting.Tests" }
+            };
+
+            var builder = new ConfigurationBuilder()
+                .AddInMemoryCollection(vals);
+            var config = builder.Build();
+            var host = CreateBuilder(config).Build();
+            var app = host.Start();
+            var hostingEnvironment = host.ApplicationServices.GetRequiredService<IHostingEnvironment>();
+            Assert.NotNull(hostingEnvironment.Configuration);
+            Assert.Equal("Microsoft.AspNet.Hosting.Tests", hostingEnvironment.Configuration["Server"]);
+        }
+
         [Fact]
         public void HostingEngineCanBeStarted()
         {