From 063420067e8529da45cab4bdb2e14dab785a5d0f Mon Sep 17 00:00:00 2001
From: GrabYourPitchforks <levib@yahoo.com>
Date: Mon, 17 Mar 2014 14:09:31 -0700
Subject: [PATCH] HostingServices should provide a default implementation of
 IDataProtectionProvider

---
 src/Microsoft.AspNet.Hosting/HostingServices.cs | 11 +++++++++++
 src/Microsoft.AspNet.Hosting/project.json       |  3 ++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/Microsoft.AspNet.Hosting/HostingServices.cs b/src/Microsoft.AspNet.Hosting/HostingServices.cs
index 9fe29dbc36..9032db6706 100644
--- a/src/Microsoft.AspNet.Hosting/HostingServices.cs
+++ b/src/Microsoft.AspNet.Hosting/HostingServices.cs
@@ -5,6 +5,7 @@ using Microsoft.AspNet.DependencyInjection;
 using Microsoft.AspNet.Hosting.Builder;
 using Microsoft.AspNet.Hosting.Server;
 using Microsoft.AspNet.Hosting.Startup;
+using Microsoft.AspNet.Security.DataProtection;
 
 namespace Microsoft.AspNet.Hosting
 {
@@ -27,6 +28,16 @@ namespace Microsoft.AspNet.Hosting
             yield return DescribeService<IHttpContextFactory, HttpContextFactory>(configuration);
 
             yield return DescribeService<ITypeActivator, TypeActivator>(configuration);
+
+            // The default IDataProtectionProvider is a singleton.
+            // Note: DPAPI isn't usable in IIS where the user profile hasn't been loaded, but loading DPAPI
+            // is deferred until the first call to Protect / Unprotect. It's up to an IIS-based host to
+            // replace this service as part of application initialization.
+            yield return new ServiceDescriptor {
+              ServiceType = typeof(IDataProtectionProvider),
+              Lifecycle = LifecycleKind.Singleton,
+              ImplementationInstance = DataProtectionProvider.CreateFromDpapi()
+            };
         }
 
         public static IServiceDescriptor DescribeService<TService, TImplementation>(IConfiguration configuration,
diff --git a/src/Microsoft.AspNet.Hosting/project.json b/src/Microsoft.AspNet.Hosting/project.json
index 26ca426580..3f0cca6268 100644
--- a/src/Microsoft.AspNet.Hosting/project.json
+++ b/src/Microsoft.AspNet.Hosting/project.json
@@ -5,7 +5,8 @@
     "Microsoft.AspNet.ConfigurationModel": "0.1-alpha-*",
     "Microsoft.AspNet.PipelineCore": "0.1-alpha-*",
     "Microsoft.AspNet.Abstractions": "0.1-alpha-*",
-    "Microsoft.AspNet.FeatureModel": "0.1-alpha-*"
+    "Microsoft.AspNet.FeatureModel": "0.1-alpha-*",
+    "Microsoft.AspNet.Security.DataProtection": "0.1-alpha-*"
   },
   "configurations": {
     "net45": {},