1 files changed, 356 insertions, 0 deletions

diff --git a/OpenSim/Capabilities/Handlers/GetTextureHandler.cs b/OpenSim/Capabilities/Handlers/GetTextureHandler.cs
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+++ b/OpenSim/Capabilities/Handlers/GetTextureHandler.cs
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+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * 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 OpenSimulator Project 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 DEVELOPERS ``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 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.Collections;
+using System.Collections.Specialized;
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.Reflection;
+using System.IO;
+using System.Web;
+using log4net;
+using Nini.Config;
+using OpenMetaverse;
+using OpenMetaverse.StructuredData;
+using OpenMetaverse.Imaging;
+using OpenSim.Framework;
+using OpenSim.Framework.Servers;
+using OpenSim.Framework.Servers.HttpServer;
+using OpenSim.Region.Framework.Interfaces;
+using OpenSim.Services.Interfaces;
+using Caps = OpenSim.Framework.Capabilities.Caps;
+
+namespace OpenSim.Capabilities.Handlers
+{
+
+    public class GetTextureHandler : BaseStreamHandler
+    {
+        private static readonly ILog m_log =
+            LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+        private IAssetService m_assetService;
+
+        public const string DefaultFormat = "x-j2c";
+
+        // TODO: Change this to a config option
+        const string REDIRECT_URL = null;
+
+        public GetTextureHandler(string path, IAssetService assService) :
+                base("GET", path)
+        {
+            m_assetService = assService;
+        }
+
+        public override byte[] Handle(string path, Stream request, OSHttpRequest httpRequest, OSHttpResponse httpResponse)
+        {
+            //m_log.DebugFormat("[GETTEXTURE]: called in {0}", m_scene.RegionInfo.RegionName);
+
+            // Try to parse the texture ID from the request URL
+            NameValueCollection query = HttpUtility.ParseQueryString(httpRequest.Url.Query);
+            string textureStr = query.GetOne("texture_id");
+            string format = query.GetOne("format");
+
+            if (m_assetService == null)
+            {
+                m_log.Error("[GETTEXTURE]: Cannot fetch texture " + textureStr + " without an asset service");
+                httpResponse.StatusCode = (int)System.Net.HttpStatusCode.NotFound;
+                return null;
+            }
+
+            UUID textureID;
+            if (!String.IsNullOrEmpty(textureStr) && UUID.TryParse(textureStr, out textureID))
+            {
+                string[] formats;
+                if (format != null && format != string.Empty)
+                {
+                    formats = new string[1] { format.ToLower() };
+                }
+                else
+                {
+                    formats = WebUtil.GetPreferredImageTypes(httpRequest.Headers.Get("Accept"));
+                    if (formats.Length == 0)
+                        formats = new string[1] { DefaultFormat }; // default
+
+                }
+                // OK, we have an array with preferred formats, possibly with only one entry
+
+                httpResponse.StatusCode = (int)System.Net.HttpStatusCode.NotFound;
+                foreach (string f in formats)
+                {
+                    if (FetchTexture(httpRequest, httpResponse, textureID, f))
+                        break;
+                }
+
+            }
+            else
+            {
+                m_log.Warn("[GETTEXTURE]: Failed to parse a texture_id from GetTexture request: " + httpRequest.Url);
+            }
+
+            httpResponse.Send();
+            return null;
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="httpRequest"></param>
+        /// <param name="httpResponse"></param>
+        /// <param name="textureID"></param>
+        /// <param name="format"></param>
+        /// <returns>False for "caller try another codec"; true otherwise</returns>
+        private bool FetchTexture(OSHttpRequest httpRequest, OSHttpResponse httpResponse, UUID textureID, string format)
+        {
+//            m_log.DebugFormat("[GETTEXTURE]: {0} with requested format {1}", textureID, format);
+            AssetBase texture;
+
+            string fullID = textureID.ToString();
+            if (format != DefaultFormat)
+                fullID = fullID + "-" + format;
+
+            if (!String.IsNullOrEmpty(REDIRECT_URL))
+            {
+                // Only try to fetch locally cached textures. Misses are redirected
+                texture = m_assetService.GetCached(fullID);
+
+                if (texture != null)
+                {
+                    if (texture.Type != (sbyte)AssetType.Texture)
+                    {
+                        httpResponse.StatusCode = (int)System.Net.HttpStatusCode.NotFound;
+                        return true;
+                    }
+                    WriteTextureData(httpRequest, httpResponse, texture, format);
+                }
+                else
+                {
+                    string textureUrl = REDIRECT_URL + textureID.ToString();
+                    m_log.Debug("[GETTEXTURE]: Redirecting texture request to " + textureUrl);
+                    httpResponse.RedirectLocation = textureUrl;
+                    return true;
+                }
+            }
+            else // no redirect
+            {
+                // try the cache
+                texture = m_assetService.GetCached(fullID);
+
+                if (texture == null)
+                {
+                    //m_log.DebugFormat("[GETTEXTURE]: texture was not in the cache");
+
+                    // Fetch locally or remotely. Misses return a 404
+                    texture = m_assetService.Get(textureID.ToString());
+
+                    if (texture != null)
+                    {
+                        if (texture.Type != (sbyte)AssetType.Texture)
+                        {
+                            httpResponse.StatusCode = (int)System.Net.HttpStatusCode.NotFound;
+                            return true;
+                        }
+                        if (format == DefaultFormat)
+                        {
+                            WriteTextureData(httpRequest, httpResponse, texture, format);
+                            return true;
+                        }
+                        else
+                        {
+                            AssetBase newTexture = new AssetBase(texture.ID + "-" + format, texture.Name, (sbyte)AssetType.Texture, texture.Metadata.CreatorID);
+                            newTexture.Data = ConvertTextureData(texture, format);
+                            if (newTexture.Data.Length == 0)
+                                return false; // !!! Caller try another codec, please!
+
+                            newTexture.Flags = AssetFlags.Collectable;
+                            newTexture.Temporary = true;
+                            m_assetService.Store(newTexture);
+                            WriteTextureData(httpRequest, httpResponse, newTexture, format);
+                            return true;
+                        }
+                    }
+               }
+               else // it was on the cache
+               {
+                   //m_log.DebugFormat("[GETTEXTURE]: texture was in the cache");
+                   WriteTextureData(httpRequest, httpResponse, texture, format);
+                   return true;
+               }
+            }
+
+            // not found
+//            m_log.Warn("[GETTEXTURE]: Texture " + textureID + " not found");
+            httpResponse.StatusCode = (int)System.Net.HttpStatusCode.NotFound;
+            return true;
+        }
+
+        private void WriteTextureData(OSHttpRequest request, OSHttpResponse response, AssetBase texture, string format)
+        {
+            string range = request.Headers.GetOne("Range");
+            //m_log.DebugFormat("[GETTEXTURE]: Range {0}", range);
+            if (!String.IsNullOrEmpty(range)) // JP2's only
+            {
+                // Range request
+                int start, end;
+                if (TryParseRange(range, out start, out end))
+                {
+                    // Before clamping start make sure we can satisfy it in order to avoid
+                    // sending back the last byte instead of an error status
+                    if (start >= texture.Data.Length)
+                    {
+                        response.StatusCode = (int)System.Net.HttpStatusCode.RequestedRangeNotSatisfiable;
+                        return;
+                    }
+
+                    end = Utils.Clamp(end, 0, texture.Data.Length - 1);
+                    start = Utils.Clamp(start, 0, end);
+                    int len = end - start + 1;
+
+                    //m_log.Debug("Serving " + start + " to " + end + " of " + texture.Data.Length + " bytes for texture " + texture.ID);
+
+                    if (len < texture.Data.Length)
+                        response.StatusCode = (int)System.Net.HttpStatusCode.PartialContent;
+
+                    response.ContentLength = len;
+                    response.ContentType = texture.Metadata.ContentType;
+                    response.AddHeader("Content-Range", String.Format("bytes {0}-{1}/{2}", start, end, texture.Data.Length));
+
+                    response.Body.Write(texture.Data, start, len);
+                }
+                else
+                {
+                    m_log.Warn("[GETTEXTURE]: Malformed Range header: " + range);
+                    response.StatusCode = (int)System.Net.HttpStatusCode.BadRequest;
+                }
+            }
+            else // JP2's or other formats
+            {
+                // Full content request
+                response.StatusCode = (int)System.Net.HttpStatusCode.OK;
+                response.ContentLength = texture.Data.Length;
+                if (format == DefaultFormat)
+                    response.ContentType = texture.Metadata.ContentType;
+                else
+                    response.ContentType = "image/" + format;
+                response.Body.Write(texture.Data, 0, texture.Data.Length);
+            }
+        }
+
+        private bool TryParseRange(string header, out int start, out int end)
+        {
+            if (header.StartsWith("bytes="))
+            {
+                string[] rangeValues = header.Substring(6).Split('-');
+                if (rangeValues.Length == 2)
+                {
+                    if (Int32.TryParse(rangeValues[0], out start) && Int32.TryParse(rangeValues[1], out end))
+                        return true;
+                }
+            }
+
+            start = end = 0;
+            return false;
+        }
+
+
+        private byte[] ConvertTextureData(AssetBase texture, string format)
+        {
+            m_log.DebugFormat("[GETTEXTURE]: Converting texture {0} to {1}", texture.ID, format);
+            byte[] data = new byte[0];
+
+            MemoryStream imgstream = new MemoryStream();
+            Bitmap mTexture = new Bitmap(1, 1);
+            ManagedImage managedImage;
+            Image image = (Image)mTexture;
+
+            try
+            {
+                // Taking our jpeg2000 data, decoding it, then saving it to a byte array with regular data
+
+                imgstream = new MemoryStream();
+
+                // Decode image to System.Drawing.Image
+                if (OpenJPEG.DecodeToImage(texture.Data, out managedImage, out image))
+                {
+                    // Save to bitmap
+                    mTexture = new Bitmap(image);
+
+                    EncoderParameters myEncoderParameters = new EncoderParameters();
+                    myEncoderParameters.Param[0] = new EncoderParameter(Encoder.Quality, 95L);
+
+                    // Save bitmap to stream
+                    ImageCodecInfo codec = GetEncoderInfo("image/" + format);
+                    if (codec != null)
+                    {
+                        mTexture.Save(imgstream, codec, myEncoderParameters);
+                        // Write the stream to a byte array for output
+                        data = imgstream.ToArray();
+                    }
+                    else
+                        m_log.WarnFormat("[GETTEXTURE]: No such codec {0}", format);
+
+                }
+            }
+            catch (Exception e)
+            {
+                m_log.WarnFormat("[GETTEXTURE]: Unable to convert texture {0} to {1}: {2}", texture.ID, format, e.Message);
+            }
+            finally
+            {
+                // Reclaim memory, these are unmanaged resources
+                // If we encountered an exception, one or more of these will be null
+                if (mTexture != null)
+                    mTexture.Dispose();
+
+                if (image != null)
+                    image.Dispose();
+
+                if (imgstream != null)
+                {
+                    imgstream.Close();
+                    imgstream.Dispose();
+                }
+            }
+
+            return data;
+        }
+
+        // From msdn
+        private static ImageCodecInfo GetEncoderInfo(String mimeType)
+        {
+            ImageCodecInfo[] encoders;
+            encoders = ImageCodecInfo.GetImageEncoders();
+            for (int j = 0; j < encoders.Length; ++j)
+            {
+                if (encoders[j].MimeType == mimeType)
+                    return encoders[j];
+            }
+            return null;
+        }
+
+
+    }
+}