First crack the API

NzbDrone.Api/Helpers/HttpRequestExtensions.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using ServiceStack.Common.Web;
+using ServiceStack.ServiceHost;
+
+namespace NzbDrone.Api.Helpers
+{
+    public static class HttpRequestExtensions
+    {
+        public static string GetApiKey(this IHttpRequest httpReq)
+        {
+            var auth = httpReq.Headers[HttpHeaders.Authorization];
+            if (auth == null) return null;
+
+            var split = auth.Split(' ');
+
+            if (split.Count() != 2)
+                return null;
+
+            if (!split[0].Equals("APIKEY", StringComparison.InvariantCultureIgnoreCase))
+                return null;
+
+            return split[1];
+        }
+    }
+}