imported signalr 1.1.3 into NzbDrone.

src/Microsoft.AspNet.SignalR.Core/Hosting/HostContextExtensions.cs

@@ -0,0 +1,53 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.md in the project root for license information.
+
+using System;
+using System.Threading;
+
+namespace Microsoft.AspNet.SignalR.Hosting
+{
+    public static class HostContextExtensions
+    {
+        public static T GetValue<T>(this HostContext context, string key)
+        {
+            if (context == null)
+            {
+                throw new ArgumentNullException("context");
+            }
+
+            object value;
+            if (context.Items.TryGetValue(key, out value))
+            {
+                return (T)value;
+            }
+            return default(T);
+        }
+
+        public static bool IsDebuggingEnabled(this HostContext context)
+        {
+            return context.GetValue<bool>(HostConstants.DebugMode);
+        }
+
+        public static bool SupportsWebSockets(this HostContext context)
+        {
+            // The server needs to implement IWebSocketRequest for websockets to be supported.
+            // It also needs to set the flag in the items collection.
+            return context.GetValue<bool>(HostConstants.SupportsWebSockets) &&
+                   context.Request is IWebSocketRequest;
+        }
+
+        public static string WebSocketServerUrl(this HostContext context)
+        {
+            return context.GetValue<string>(HostConstants.WebSocketServerUrl);
+        }
+
+        public static CancellationToken HostShutdownToken(this HostContext context)
+        {
+            return context.GetValue<CancellationToken>(HostConstants.ShutdownToken);
+        }
+
+        public static string InstanceName(this HostContext context)
+        {
+            return context.GetValue<string>(HostConstants.InstanceName);
+        }
+    }
+}