websitepanel/WebsitePanel/Sources/WebsitePanel.WebPortal/DesktopModules/WebsitePanel/ResizeImage.ashx.cs

// Copyright (c) 2014, Outercurve Foundation.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// - Redistributions of source code must  retain  the  above copyright notice, this
//   list of conditions and the following disclaimer.
//
// - Redistributions in binary form  must  reproduce the  above  copyright  notice,
//   this list of conditions  and  the  following  disclaimer in  the documentation
//   and/or other materials provided with the distribution.
//
// - Neither  the  name  of  the  Outercurve Foundation  nor   the   names  of  its
//   contributors may be used to endorse or  promote  products  derived  from  this
//   software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,  BUT  NOT  LIMITED TO, THE IMPLIED
// WARRANTIES  OF  MERCHANTABILITY   AND  FITNESS  FOR  A  PARTICULAR  PURPOSE  ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL,  SPECIAL,  EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO,  PROCUREMENT  OF  SUBSTITUTE  GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)  HOWEVER  CAUSED AND ON
// ANY  THEORY  OF  LIABILITY,  WHETHER  IN  CONTRACT,  STRICT  LIABILITY,  OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE)  ARISING  IN  ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

using System;
using System.Drawing;
using System.Net;
using System.Web;
using System.Web.Services;
using System.Text;
using System.Diagnostics;
using System.Drawing.Imaging;

namespace WebsitePanel.Portal
{
    /// <summary>
    /// Summary description for $codebehindclassname$
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    public class ResizeImage : IHttpHandler
    {

        public const string URL = "url";

        public const string WIDTH = "width";

        public const string HEIGHT = "height";

		public const int MaxDownloadAttempts = 5;

		public const int BitmapCacheDurationInSeconds = 900;


        private static bool Abort()
        {
            return false;
        }

        public void ProcessRequest(HttpContext context)
        {
            context.Response.Clear();
            context.Response.ContentType = "image/png";

            string imageUrl = context.Request.QueryString[URL];
            if (!string.IsNullOrEmpty(imageUrl))
            {
				// Create decoded version of the image url
				imageUrl = context.Server.UrlDecode(imageUrl);
				//
				Image img = null;

				try
				{
					WebRequest request = WebRequest.Create(imageUrl);
					WebResponse response = request.GetResponse();
					// Load image stream from the response
					img = new Bitmap(response.GetResponseStream());
				}
				catch (Exception ex)
				{
					Trace.TraceError(ex.StackTrace);
				}

                int width = Utils.ParseInt(context.Request.QueryString[WIDTH], 20);
                int height = Utils.ParseInt(context.Request.QueryString[HEIGHT], 20);

                // calculate new size
                int h = (img != null) ? img.Height : height;
                int w = (img != null) ? img.Width : width;
                int b = Math.Max(h, w);
                double per = b > Math.Max(width, height) ? (Math.Max(width, height) * 1.0) / b : 1.0;

                h = (int)(h * per);
                w = (int)(w * per);

                Bitmap bitmap = new Bitmap(width, height, PixelFormat.Format32bppArgb);
                Graphics new_g = Graphics.FromImage(bitmap);
                new_g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                new_g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;

                // draw white background
                SolidBrush brush = new SolidBrush(Color.White);
                new_g.FillRectangle(brush, new Rectangle(0, 0, width, height));
                brush.Dispose();

                if (img != null)
                {
                    // draw image
                    new_g.DrawImage(img, 0, 0, w, h);
                    img.Dispose();
                }

                // emit it to the response stream
                bitmap.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);

                // clean-up
                bitmap.Dispose();
                new_g.Dispose();

				// set cache info if image was loaded
                if (img != null)
                {
                    context.Response.Cache.SetExpires(DateTime.Now.AddSeconds(BitmapCacheDurationInSeconds));
                    context.Response.Cache.SetCacheability(HttpCacheability.Public);
                    context.Response.Cache.SetValidUntilExpires(true);
                }

                // end response
				context.Response.End();                                               
            }
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}