Jsonp Action Result

JsonpResult.cs

	public class JsonpResult : JsonResult
	{
		private const string NullCallbackExceptionMessage = "Callback cannot be null.";
		private const string NullContextExceptionMessage = "Context cannot be null.";
		private const string JsonpCallbackFormat = "{0}({1});";
		private const string JsonpContentType = "application/javascript";

		private const string InvalidOperationExceptionMessage =
			"This request has been blocked because sensitive information could be disclosed to third party web sites when this is used in a GET request. To allow GET requests, set JsonRequestBehavior to AllowGet.";

		private const string HttpVerbGet = "get";

		#region Factories

		public static JsonpResult For(string callback, object data)
		{
			return For(callback, data, null);
		}

		public static JsonpResult For(string callback, object data, JsonRequestBehavior jsonRequestBehavior)
		{
			return For(callback, data, null, jsonRequestBehavior);
		}

		public static JsonpResult For(string callback, object data, string contentType)
		{
			return For(callback, data, contentType, null);
		}

		public static JsonpResult For(string callback, object data, string contentType, JsonRequestBehavior jsonRequestBehavior)
		{
			return For(callback, data, contentType, null, jsonRequestBehavior);
		}

		public static JsonpResult For(string callback, object data, string contentType, Encoding contentEncoding)
		{
			return For(callback, data, contentType, contentEncoding, JsonRequestBehavior.DenyGet);
		}

		public static JsonpResult For(string callback, object data, string contentType, Encoding contentEncoding, JsonRequestBehavior jsonRequestBehavior)
		{
			return new JsonpResult {Callback = callback, ContentEncoding = contentEncoding, ContentType = contentType, Data = data, JsonRequestBehavior = jsonRequestBehavior};
		}

		#endregion

		public string Callback { get; set; }

		public override void ExecuteResult(ControllerContext context)
		{
			CheckContext(context);
			CheckRequestBehavior(context);
			CheckCallback();
			HttpResponseBase response = context.HttpContext.Response;
			SetResponseContentType(response);
			SetResponseContentEncoding(response);
			string serializedData = string.Empty;
			if (Data != null)
			{
				serializedData = JsonConvert.SerializeObject(Data);
			}
			response.Write(string.Format(JsonpCallbackFormat, Callback, serializedData));
		}

		private static void CheckContext(ControllerContext context)
		{
			if (context == null)
			{
				throw new ArgumentNullException(NullContextExceptionMessage);
			}
		}

		private void CheckRequestBehavior(ControllerContext context)
		{
			if (JsonRequestBehavior == JsonRequestBehavior.DenyGet && context.HttpContext.Request.HttpMethod.ToLower() == HttpVerbGet)
			{
				throw new InvalidOperationException(InvalidOperationExceptionMessage);
			}
		}

		private void CheckCallback()
		{
			if (Callback == null)
			{
				throw new ArgumentNullException(NullCallbackExceptionMessage);
			}
		}

		private void SetResponseContentType(HttpResponseBase response)
		{
			if (string.IsNullOrEmpty(ContentType))
			{
				response.ContentType = JsonpContentType;
			}
			else
			{
				response.ContentType = ContentType;
			}
		}

		private void SetResponseContentEncoding(HttpResponseBase response)
		{
			if (ContentEncoding == null)
			{
				return;
			}
			response.ContentEncoding = ContentEncoding;
		}
	}