From 7b4e1fd48e91408eb039b7f565ca8bfbb8fb030a Mon Sep 17 00:00:00 2001
From: David Fowler <davidfowl@gmail.com>
Date: Tue, 29 Apr 2014 23:58:53 -0700
Subject: [PATCH] Added DPAPI implementation that works on mono

---
 .../HostingServices.cs                        | 19 ++++++++++++++-----
 .../Microsoft.AspNet.Hosting.kproj            |  1 +
 .../PlatformHelper.cs                         | 17 +++++++++++++++++
 3 files changed, 32 insertions(+), 5 deletions(-)
 create mode 100644 src/Microsoft.AspNet.Hosting/PlatformHelper.cs

diff --git a/src/Microsoft.AspNet.Hosting/HostingServices.cs b/src/Microsoft.AspNet.Hosting/HostingServices.cs
index 4ef1e162c6..64f50b58ad 100644
--- a/src/Microsoft.AspNet.Hosting/HostingServices.cs
+++ b/src/Microsoft.AspNet.Hosting/HostingServices.cs
@@ -37,11 +37,20 @@ namespace Microsoft.AspNet.Hosting
                 Lifecycle = LifecycleKind.Scoped
             };
 
-            // 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 describer.Instance<IDataProtectionProvider>(DataProtectionProvider.CreateFromDpapi());
+            if (PlatformHelper.IsMono)
+            {
+#if NET45
+                yield return describer.Instance<IDataProtectionProvider>(DataProtectionProvider.CreateFromLegacyDpapi());
+#endif
+            }
+            else
+            {
+                // 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 describer.Instance<IDataProtectionProvider>(DataProtectionProvider.CreateFromDpapi());
+            }
         }
     }
 }
\ No newline at end of file
diff --git a/src/Microsoft.AspNet.Hosting/Microsoft.AspNet.Hosting.kproj b/src/Microsoft.AspNet.Hosting/Microsoft.AspNet.Hosting.kproj
index de22702e86..5e436ba601 100644
--- a/src/Microsoft.AspNet.Hosting/Microsoft.AspNet.Hosting.kproj
+++ b/src/Microsoft.AspNet.Hosting/Microsoft.AspNet.Hosting.kproj
@@ -29,6 +29,7 @@
     <Compile Include="HostingServices.cs" />
     <Compile Include="IHostingEngine.cs" />
     <Compile Include="PipelineInstance.cs" />
+    <Compile Include="PlatformHelper.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Server\IServerFactory.cs" />
     <Compile Include="Server\IServerManager.cs" />
diff --git a/src/Microsoft.AspNet.Hosting/PlatformHelper.cs b/src/Microsoft.AspNet.Hosting/PlatformHelper.cs
new file mode 100644
index 0000000000..2d2f0adeed
--- /dev/null
+++ b/src/Microsoft.AspNet.Hosting/PlatformHelper.cs
@@ -0,0 +1,17 @@
+using System;
+
+namespace Microsoft.AspNet.Hosting
+{
+    internal static class PlatformHelper
+    {
+        private static Lazy<bool> _isMono = new Lazy<bool>(() => Type.GetType("Mono.Runtime") != null);
+
+        public static bool IsMono
+        {
+            get
+            {
+                return _isMono.Value;
+            }
+        }
+    }
+}
\ No newline at end of file