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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.Reflection;
using System.IO;
using System.Web;
using log4net;
using Nini.Config;
using OpenMetaverse;
using OpenMetaverse.StructuredData;
using OpenSim.Framework;
using OpenSim.Framework.Servers;
using OpenSim.Framework.Servers.HttpServer;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Region.Framework.Scenes;
using OpenSim.Services.Interfaces;
using Caps = OpenSim.Framework.Capabilities.Caps;
namespace OpenSim.Region.CoreModules.Avatar.ObjectCaps
{
#region Stream Handler
public delegate byte[] StreamHandlerCallback(string path, Stream request, OSHttpRequest httpRequest, OSHttpResponse httpResponse);
public class StreamHandler : BaseStreamHandler
{
StreamHandlerCallback m_callback;
public StreamHandler(string httpMethod, string path, StreamHandlerCallback callback)
: base(httpMethod, path)
{
m_callback = callback;
}
public override byte[] Handle(string path, Stream request, OSHttpRequest httpRequest, OSHttpResponse httpResponse)
{
return m_callback(path, request, httpRequest, httpResponse);
}
}
#endregion Stream Handler
public class GetTextureModule : IRegionModule
{
private static readonly ILog m_log =
LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
private Scene m_scene;
private IAssetService m_assetService;
#region IRegionModule Members
public void Initialise(Scene pScene, IConfigSource pSource)
{
m_scene = pScene;
}
public void PostInitialise()
{
m_assetService = m_scene.RequestModuleInterface<IAssetService>();
m_scene.EventManager.OnRegisterCaps += RegisterCaps;
}
public void Close() { }
public string Name { get { return "GetTextureModule"; } }
public bool IsSharedModule { get { return false; } }
public void RegisterCaps(UUID agentID, Caps caps)
{
UUID capID = UUID.Random();
m_log.Info("[GETTEXTURE]: /CAPS/" + capID);
caps.RegisterHandler("GetTexture", new StreamHandler("GET", "/CAPS/" + capID, ProcessGetTexture));
}
#endregion
private byte[] ProcessGetTexture(string path, Stream request, OSHttpRequest httpRequest, OSHttpResponse httpResponse)
{
// TODO: Change this to a config option
const string REDIRECT_URL = null;
// Try to parse the texture ID from the request URL
NameValueCollection query = HttpUtility.ParseQueryString(httpRequest.Url.Query);
string textureStr = GetOne(query, "texture_id");
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))
{
AssetBase texture;
if (!String.IsNullOrEmpty(REDIRECT_URL))
{
// Only try to fetch locally cached textures. Misses are redirected
texture = m_assetService.GetCached(textureID.ToString());
if (texture != null)
{
SendTexture(httpRequest, httpResponse, texture);
}
else
{
string textureUrl = REDIRECT_URL + textureID.ToString();
m_log.Debug("[GETTEXTURE]: Redirecting texture request to " + textureUrl);
httpResponse.RedirectLocation = textureUrl;
}
}
else
{
// Fetch locally or remotely. Misses return a 404
texture = m_assetService.Get(textureID.ToString());
if (texture != null)
{
SendTexture(httpRequest, httpResponse, texture);
}
else
{
m_log.Warn("[GETTEXTURE]: Texture " + textureID + " not found");
httpResponse.StatusCode = (int)System.Net.HttpStatusCode.NotFound;
}
}
}
else
{
m_log.Warn("[GETTEXTURE]: Failed to parse a texture_id from GetTexture request: " + httpRequest.Url);
}
httpResponse.Send();
return null;
}
private void SendTexture(OSHttpRequest request, OSHttpResponse response, AssetBase texture)
{
string range = GetOne(request.Headers, "Range");
if (!String.IsNullOrEmpty(range))
{
// Range request
int start, end;
if (TryParseRange(range, out start, out end))
{
end = Utils.Clamp(end, 1, texture.Data.Length);
start = Utils.Clamp(start, 0, end - 1);
m_log.Debug("Serving " + start + " to " + end + " of " + texture.Data.Length + " bytes for texture " + texture.ID);
if (end - start < texture.Data.Length)
response.StatusCode = (int)System.Net.HttpStatusCode.PartialContent;
response.ContentLength = end - start;
response.ContentType = texture.Metadata.ContentType;
response.Body.Write(texture.Data, start, end - start);
}
else
{
m_log.Warn("Malformed Range header: " + range);
response.StatusCode = (int)System.Net.HttpStatusCode.BadRequest;
}
}
else
{
// Full content request
response.ContentLength = texture.Data.Length;
response.ContentType = texture.Metadata.ContentType;
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 static string GetOne(NameValueCollection collection, string key)
{
string[] values = collection.GetValues(key);
if (values != null && values.Length > 0)
return values[0];
return null;
}
}
}
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