/WCFWebApi/prototype/Microsoft.ApplicationServer.HttpEnhancements/Microsoft/ApplicationServer/Http/JsonpMediaTypeFormatter.cs

// <copyright>

//   Copyright (c) Microsoft Corporation.  All rights reserved.

// </copyright>



namespace Microsoft.ApplicationServer.Http

{

    using System;

    using System.Collections.Generic;

    using System.IO;

    using System.Linq;

    using System.Net;

    using System.Net.Http.Formatting;

    using System.Net.Http.Headers;



    public class JsonpMediaTypeFormatter : JsonMediaTypeFormatter

    {

        public JsonpMediaTypeFormatter()

        {

            MediaTypeHeaderValue jsonpMediaType = new MediaTypeHeaderValue("application/javascript");



            SupportedMediaTypes.Add(jsonpMediaType);

            SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/javascript"));



            MediaTypeMappings.Add(new UriPathExtensionMapping("jsonp", jsonpMediaType));

        }



        protected override void OnWriteToStream(Type type, object value, Stream stream, HttpContentHeaders contentHeaders, TransportContext context)

        {

            IEnumerable<string> callbackValues = null;

            if (contentHeaders.TryGetValues("jsonp-callback", out callbackValues))

            {

                var callback = callbackValues.First<string>();

                var writer = new StreamWriter(stream);

                writer.Write(callback + "(");

                writer.Flush();

                base.OnWriteToStream(type, value, stream, contentHeaders, context);

                writer.Write(")");

                writer.Flush();

            }

            else

            {

                base.OnWriteToStream(type, value, stream, contentHeaders, context);

            }

        }

    }

}