430 lines
18 KiB
C#
430 lines
18 KiB
C#
/*
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* Copyright (c) Contributors, http://opensimulator.org/
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* See CONTRIBUTORS.TXT for a full list of copyright holders.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the OpenSimulator Project nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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using System.Collections;
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using System.Collections.Specialized;
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using System.Drawing;
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using System.Drawing.Imaging;
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using System.Reflection;
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using System.IO;
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using System.Web;
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using log4net;
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using Nini.Config;
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using OpenMetaverse;
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using OpenMetaverse.StructuredData;
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using OpenMetaverse.Imaging;
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using OpenSim.Framework;
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using OpenSim.Framework.Servers;
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using OpenSim.Framework.Servers.HttpServer;
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using OpenSim.Region.Framework.Interfaces;
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using OpenSim.Services.Interfaces;
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using Caps = OpenSim.Framework.Capabilities.Caps;
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namespace OpenSim.Capabilities.Handlers
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{
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public class GetTextureHandler
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{
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private static readonly ILog m_log =
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LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
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private IAssetService m_assetService;
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public const string DefaultFormat = "x-j2c";
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public GetTextureHandler(IAssetService assService)
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{
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m_assetService = assService;
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}
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public Hashtable Handle(Hashtable request)
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{
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Hashtable ret = new Hashtable();
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ret["int_response_code"] = (int)System.Net.HttpStatusCode.NotFound;
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ret["content_type"] = "text/plain";
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ret["keepalive"] = false;
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ret["reusecontext"] = false;
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ret["int_bytes"] = 0;
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string textureStr = (string)request["texture_id"];
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string format = (string)request["format"];
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//m_log.DebugFormat("[GETTEXTURE]: called {0}", textureStr);
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if (m_assetService == null)
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{
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m_log.Error("[GETTEXTURE]: Cannot fetch texture " + textureStr + " without an asset service");
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}
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UUID textureID;
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if (!String.IsNullOrEmpty(textureStr) && UUID.TryParse(textureStr, out textureID))
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{
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// m_log.DebugFormat("[GETTEXTURE]: Received request for texture id {0}", textureID);
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string[] formats;
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if (!string.IsNullOrEmpty(format))
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{
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formats = new string[1] { format.ToLower() };
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}
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else
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{
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formats = new string[1] { DefaultFormat }; // default
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if (((Hashtable)request["headers"])["Accept"] != null)
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formats = WebUtil.GetPreferredImageTypes((string)((Hashtable)request["headers"])["Accept"]);
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if (formats.Length == 0)
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formats = new string[1] { DefaultFormat }; // default
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}
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// OK, we have an array with preferred formats, possibly with only one entry
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bool foundtexture = false;
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foreach (string f in formats)
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{
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foundtexture = FetchTexture(request, ret, textureID, f);
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if (foundtexture)
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break;
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}
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if (!foundtexture)
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{
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ret["int_response_code"] = 404;
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ret["error_status_text"] = "not found";
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ret["str_response_string"] = "not found";
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ret["content_type"] = "text/plain";
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ret["keepalive"] = false;
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ret["reusecontext"] = false;
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ret["int_bytes"] = 0;
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}
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}
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else
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{
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m_log.Warn("[GETTEXTURE]: Failed to parse a texture_id from GetTexture request: " + (string)request["uri"]);
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}
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// m_log.DebugFormat(
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// "[GETTEXTURE]: For texture {0} sending back response {1}, data length {2}",
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// textureID, httpResponse.StatusCode, httpResponse.ContentLength);
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return ret;
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}
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/// <summary>
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///
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/// </summary>
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/// <param name="httpRequest"></param>
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/// <param name="httpResponse"></param>
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/// <param name="textureID"></param>
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/// <param name="format"></param>
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/// <returns>False for "caller try another codec"; true otherwise</returns>
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private bool FetchTexture(Hashtable request, Hashtable response, UUID textureID, string format)
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{
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// m_log.DebugFormat("[GETTEXTURE]: {0} with requested format {1}", textureID, format);
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AssetBase texture;
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string fullID = textureID.ToString();
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if (format != DefaultFormat)
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fullID = fullID + "-" + format;
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// try the cache
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texture = m_assetService.GetCached(fullID);
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if (texture == null)
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{
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//m_log.DebugFormat("[GETTEXTURE]: texture was not in the cache");
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// Fetch locally or remotely. Misses return a 404
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texture = m_assetService.Get(textureID.ToString());
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if (texture != null)
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{
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if (texture.Type != (sbyte)AssetType.Texture)
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return true;
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if (format == DefaultFormat)
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{
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WriteTextureData(request, response, texture, format);
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return true;
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}
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else
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{
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AssetBase newTexture = new AssetBase(texture.ID + "-" + format, texture.Name, (sbyte)AssetType.Texture, texture.Metadata.CreatorID);
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newTexture.Data = ConvertTextureData(texture, format);
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if (newTexture.Data.Length == 0)
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return false; // !!! Caller try another codec, please!
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newTexture.Flags = AssetFlags.Collectable;
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newTexture.Temporary = true;
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newTexture.Local = true;
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m_assetService.Store(newTexture);
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WriteTextureData(request, response, newTexture, format);
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return true;
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}
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}
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}
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else // it was on the cache
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{
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//m_log.DebugFormat("[GETTEXTURE]: texture was in the cache");
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WriteTextureData(request, response, texture, format);
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return true;
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}
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//response = new Hashtable();
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//WriteTextureData(request,response,null,format);
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// not found
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//m_log.Warn("[GETTEXTURE]: Texture " + textureID + " not found");
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return false;
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}
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private void WriteTextureData(Hashtable request, Hashtable response, AssetBase texture, string format)
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{
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Hashtable headers = new Hashtable();
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response["headers"] = headers;
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string range = String.Empty;
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if (((Hashtable)request["headers"])["range"] != null)
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range = (string)((Hashtable)request["headers"])["range"];
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else if (((Hashtable)request["headers"])["Range"] != null)
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range = (string)((Hashtable)request["headers"])["Range"];
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if (!String.IsNullOrEmpty(range)) // JP2's only
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{
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// Range request
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int start, end;
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if (TryParseRange(range, out start, out end))
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{
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// Before clamping start make sure we can satisfy it in order to avoid
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// sending back the last byte instead of an error status
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if (start >= texture.Data.Length)
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{
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// m_log.DebugFormat(
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// "[GETTEXTURE]: Client requested range for texture {0} starting at {1} but texture has end of {2}",
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// texture.ID, start, texture.Data.Length);
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// Stricly speaking, as per http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html, we should be sending back
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// Requested Range Not Satisfiable (416) here. However, it appears that at least recent implementations
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// of the Linden Lab viewer (3.2.1 and 3.3.4 and probably earlier), a viewer that has previously
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// received a very small texture may attempt to fetch bytes from the server past the
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// range of data that it received originally. Whether this happens appears to depend on whether
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// the viewer's estimation of how large a request it needs to make for certain discard levels
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// (http://wiki.secondlife.com/wiki/Image_System#Discard_Level_and_Mip_Mapping), chiefly discard
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// level 2. If this estimate is greater than the total texture size, returning a RequestedRangeNotSatisfiable
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// here will cause the viewer to treat the texture as bad and never display the full resolution
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// However, if we return PartialContent (or OK) instead, the viewer will display that resolution.
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// response.StatusCode = (int)System.Net.HttpStatusCode.RequestedRangeNotSatisfiable;
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// viewers don't seem to handle RequestedRangeNotSatisfiable and keep retrying with same parameters
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response["int_response_code"] = (int)System.Net.HttpStatusCode.NotFound;
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}
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else
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{
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// Handle the case where no second range value was given. This is equivalent to requesting
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// the rest of the entity.
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if (end == -1)
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end = int.MaxValue;
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end = Utils.Clamp(end, 0, texture.Data.Length - 1);
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start = Utils.Clamp(start, 0, end);
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int len = end - start + 1;
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// m_log.Debug("Serving " + start + " to " + end + " of " + texture.Data.Length + " bytes for texture " + texture.ID);
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response["content-type"] = texture.Metadata.ContentType;
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if (start == 0 && len == texture.Data.Length) // well redudante maybe
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{
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response["int_response_code"] = (int)System.Net.HttpStatusCode.OK;
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response["bin_response_data"] = texture.Data;
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response["int_bytes"] = texture.Data.Length;
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}
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else
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{
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response["int_response_code"] = (int)System.Net.HttpStatusCode.PartialContent;
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headers["Content-Range"] = String.Format("bytes {0}-{1}/{2}", start, end, texture.Data.Length);
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byte[] d = new byte[len];
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Array.Copy(texture.Data, start, d, 0, len);
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response["bin_response_data"] = d;
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response["int_bytes"] = len;
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}
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// response.Body.Write(texture.Data, start, len);
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}
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}
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else
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{
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m_log.Warn("[GETTEXTURE]: Malformed Range header: " + range);
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response["int_response_code"] = (int)System.Net.HttpStatusCode.BadRequest;
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}
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}
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else // JP2's or other formats
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{
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// Full content request
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response["int_response_code"] = (int)System.Net.HttpStatusCode.OK;
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if (format == DefaultFormat)
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response["content_type"] = texture.Metadata.ContentType;
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else
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response["content_type"] = "image/" + format;
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response["bin_response_data"] = texture.Data;
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response["int_bytes"] = texture.Data.Length;
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// response.Body.Write(texture.Data, 0, texture.Data.Length);
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}
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// if (response.StatusCode < 200 || response.StatusCode > 299)
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// m_log.WarnFormat(
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// "[GETTEXTURE]: For texture {0} requested range {1} responded {2} with content length {3} (actual {4})",
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// texture.FullID, range, response.StatusCode, response.ContentLength, texture.Data.Length);
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// else
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// m_log.DebugFormat(
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// "[GETTEXTURE]: For texture {0} requested range {1} responded {2} with content length {3} (actual {4})",
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// texture.FullID, range, response.StatusCode, response.ContentLength, texture.Data.Length);
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}
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/// <summary>
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/// Parse a range header.
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/// </summary>
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/// <remarks>
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/// As per http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html,
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/// this obeys range headers with two values (e.g. 533-4165) and no second value (e.g. 533-).
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/// Where there is no value, -1 is returned.
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/// FIXME: Need to cover the case where only a second value is specified (e.g. -4165), probably by returning -1
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/// for start.</remarks>
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/// <returns></returns>
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/// <param name='header'></param>
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/// <param name='start'>Start of the range. Undefined if this was not a number.</param>
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/// <param name='end'>End of the range. Will be -1 if no end specified. Undefined if there was a raw string but this was not a number.</param>
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private bool TryParseRange(string header, out int start, out int end)
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{
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start = end = 0;
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if (header.StartsWith("bytes="))
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{
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string[] rangeValues = header.Substring(6).Split('-');
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if (rangeValues.Length == 2)
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{
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if (!Int32.TryParse(rangeValues[0], out start))
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return false;
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string rawEnd = rangeValues[1];
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if (rawEnd == "")
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{
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end = -1;
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return true;
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}
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else if (Int32.TryParse(rawEnd, out end))
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{
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return true;
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}
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}
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}
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start = end = 0;
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return false;
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}
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private byte[] ConvertTextureData(AssetBase texture, string format)
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{
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m_log.DebugFormat("[GETTEXTURE]: Converting texture {0} to {1}", texture.ID, format);
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byte[] data = new byte[0];
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MemoryStream imgstream = new MemoryStream();
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Bitmap mTexture = null;
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ManagedImage managedImage = null;
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Image image = null;
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try
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{
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// Taking our jpeg2000 data, decoding it, then saving it to a byte array with regular data
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imgstream = new MemoryStream();
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// Decode image to System.Drawing.Image
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if (OpenJPEG.DecodeToImage(texture.Data, out managedImage, out image) && image != null)
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{
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// Save to bitmap
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mTexture = new Bitmap(image);
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using(EncoderParameters myEncoderParameters = new EncoderParameters())
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{
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myEncoderParameters.Param[0] = new EncoderParameter(Encoder.Quality,95L);
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// Save bitmap to stream
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ImageCodecInfo codec = GetEncoderInfo("image/" + format);
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if (codec != null)
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{
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mTexture.Save(imgstream, codec, myEncoderParameters);
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// Write the stream to a byte array for output
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data = imgstream.ToArray();
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}
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else
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m_log.WarnFormat("[GETTEXTURE]: No such codec {0}", format);
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}
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}
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}
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catch (Exception e)
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{
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m_log.WarnFormat("[GETTEXTURE]: Unable to convert texture {0} to {1}: {2}", texture.ID, format, e.Message);
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}
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finally
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{
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// Reclaim memory, these are unmanaged resources
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// If we encountered an exception, one or more of these will be null
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if (mTexture != null)
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mTexture.Dispose();
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if (image != null)
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image.Dispose();
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if(managedImage != null)
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managedImage.Clear();
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if (imgstream != null)
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{
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imgstream.Close();
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imgstream.Dispose();
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}
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}
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return data;
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}
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// From msdn
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private static ImageCodecInfo GetEncoderInfo(String mimeType)
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{
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ImageCodecInfo[] encoders;
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encoders = ImageCodecInfo.GetImageEncoders();
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for (int j = 0; j < encoders.Length; ++j)
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{
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if (encoders[j].MimeType == mimeType)
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return encoders[j];
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}
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return null;
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}
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}
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}
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