update to service stack v4

MediaBrowser.Server.Implementations/HttpServer/ResponseFilter.cs

@@ -0,0 +1,102 @@
+using MediaBrowser.Model.Logging;
+using ServiceStack;
+using ServiceStack.Web;
+using System;
+using System.Globalization;
+using System.Net;
+using System.Text;
+
+namespace MediaBrowser.Server.Implementations.HttpServer
+{
+    public class ResponseFilter
+    {
+        private static readonly CultureInfo UsCulture = new CultureInfo("en-US");
+        private readonly ILogger _logger;
+
+        public ResponseFilter(ILogger logger)
+        {
+            _logger = logger;
+        }
+
+        /// <summary>
+        /// Filters the response.
+        /// </summary>
+        /// <param name="req">The req.</param>
+        /// <param name="res">The res.</param>
+        /// <param name="dto">The dto.</param>
+        public void FilterResponse(IRequest req, IResponse res, object dto)
+        {
+            // Try to prevent compatibility view
+            res.AddHeader("X-UA-Compatible", "IE=Edge");
+
+            var exception = dto as Exception;
+
+            if (exception != null)
+            {
+                _logger.ErrorException("Error processing request for {0}", exception, req.RawUrl);
+
+                if (!string.IsNullOrEmpty(exception.Message))
+                {
+                    var error = exception.Message.Replace(Environment.NewLine, " ");
+                    error = RemoveControlCharacters(error);
+
+                    res.AddHeader("X-Application-Error-Code", error);
+                }
+            }
+
+            if (dto is CompressedResult)
+            {
+                // Per Google PageSpeed
+                // This instructs the proxies to cache two versions of the resource: one compressed, and one uncompressed. 
+                // The correct version of the resource is delivered based on the client request header. 
+                // This is a good choice for applications that are singly homed and depend on public proxies for user locality.                        
+                res.AddHeader("Vary", "Accept-Encoding");
+            }
+
+            var hasOptions = dto as IHasOptions;
+
+            if (hasOptions != null)
+            {
+                // Content length has to be explicitly set on on HttpListenerResponse or it won't be happy
+                string contentLength;
+
+                if (hasOptions.Options.TryGetValue("Content-Length", out contentLength) && !string.IsNullOrEmpty(contentLength))
+                {
+                    var length = long.Parse(contentLength, UsCulture);
+
+                    if (length > 0)
+                    {
+                        var response = (HttpListenerResponse)res.OriginalResponse;
+
+                        response.ContentLength64 = length;
+
+                        // Disable chunked encoding. Technically this is only needed when using Content-Range, but
+                        // anytime we know the content length there's no need for it
+                        response.SendChunked = false;
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        /// Removes the control characters.
+        /// </summary>
+        /// <param name="inString">The in string.</param>
+        /// <returns>System.String.</returns>
+        private static string RemoveControlCharacters(string inString)
+        {
+            if (inString == null) return null;
+
+            var newString = new StringBuilder();
+
+            foreach (var ch in inString)
+            {
+                if (!char.IsControl(ch))
+                {
+                    newString.Append(ch);
+                }
+            }
+            return newString.ToString();
+        }
+    }
+}