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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 log4net;
using OpenMetaverse;
using OpenMetaverse.Imaging;
using OpenSim.Framework;
using OpenSim.Framework.Servers.HttpServer;
using OpenSim.Services.Interfaces;
using System;
using System.Collections.Specialized;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Reflection;
using System.Web;
namespace OpenSim.Capabilities.Handlers
{
public class GetMeshHandler : BaseStreamHandler
{
private static readonly ILog m_log =
LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
private IAssetService m_assetService;
// TODO: Change this to a config option
private string m_RedirectURL = null;
public GetMeshHandler(string path, IAssetService assService, string name, string description, string redirectURL)
: base("GET", path, name, description)
{
m_assetService = assService;
m_RedirectURL = redirectURL;
if (m_RedirectURL != null && !m_RedirectURL.EndsWith("/"))
m_RedirectURL += "/";
}
protected override byte[] ProcessRequest(string path, Stream request, IOSHttpRequest httpRequest, IOSHttpResponse httpResponse)
{
// Try to parse the texture ID from the request URL
NameValueCollection query = HttpUtility.ParseQueryString(httpRequest.Url.Query);
string textureStr = query.GetOne("mesh_id");
if (m_assetService == null)
{
m_log.Error("[GETMESH]: Cannot fetch mesh " + textureStr + " without an asset service");
httpResponse.StatusCode = (int)System.Net.HttpStatusCode.NotFound;
}
UUID meshID;
if (!String.IsNullOrEmpty(textureStr) && UUID.TryParse(textureStr, out meshID))
{
// OK, we have an array with preferred formats, possibly with only one entry
httpResponse.StatusCode = (int)System.Net.HttpStatusCode.NotFound;
AssetBase mesh;
if (!String.IsNullOrEmpty(m_RedirectURL))
{
// Only try to fetch locally cached meshes. Misses are redirected
mesh = m_assetService.GetCached(meshID.ToString());
if (mesh != null)
{
if (mesh.Type != (sbyte)AssetType.Mesh)
{
httpResponse.StatusCode = (int)System.Net.HttpStatusCode.NotFound;
}
WriteMeshData(httpRequest, httpResponse, mesh);
}
else
{
string textureUrl = m_RedirectURL + "?mesh_id="+ meshID.ToString();
m_log.Debug("[GETMESH]: Redirecting mesh request to " + textureUrl);
httpResponse.StatusCode = (int)OSHttpStatusCode.RedirectMovedPermanently;
httpResponse.RedirectLocation = textureUrl;
return null;
}
}
else // no redirect
{
// try the cache
mesh = m_assetService.GetCached(meshID.ToString());
if (mesh == null)
{
// Fetch locally or remotely. Misses return a 404
mesh = m_assetService.Get(meshID.ToString());
if (mesh != null)
{
if (mesh.Type != (sbyte)AssetType.Mesh)
{
httpResponse.StatusCode = (int)System.Net.HttpStatusCode.NotFound;
return null;
}
WriteMeshData(httpRequest, httpResponse, mesh);
return null;
}
}
else // it was on the cache
{
if (mesh.Type != (sbyte)AssetType.Mesh)
{
httpResponse.StatusCode = (int)System.Net.HttpStatusCode.NotFound;
return null;
}
WriteMeshData(httpRequest, httpResponse, mesh);
return null;
}
}
// not found
httpResponse.StatusCode = (int)System.Net.HttpStatusCode.NotFound;
return null;
}
else
{
m_log.Warn("[GETTEXTURE]: Failed to parse a mesh_id from GetMesh request: " + httpRequest.Url);
}
return null;
}
private void WriteMeshData(IOSHttpRequest request, IOSHttpResponse response, AssetBase texture)
{
string range = request.Headers.GetOne("Range");
if (!String.IsNullOrEmpty(range))
{
// 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.PartialContent;
response.ContentType = texture.Metadata.ContentType;
}
else
{
// Handle the case where no second range value was given. This is equivalent to requesting
// the rest of the entity.
if (end == -1)
end = int.MaxValue;
end = Utils.Clamp(end, 0, texture.Data.Length - 1);
start = Utils.Clamp(start, 0, end);
int len = end - start + 1;
if (0 == start && len == texture.Data.Length)
{
response.StatusCode = (int)System.Net.HttpStatusCode.OK;
}
else
{
response.StatusCode = (int)System.Net.HttpStatusCode.PartialContent;
response.AddHeader("Content-Range", String.Format("bytes {0}-{1}/{2}", start, end, texture.Data.Length));
}
response.ContentLength = len;
response.ContentType = "application/vnd.ll.mesh";
response.Body.Write(texture.Data, start, len);
}
}
else
{
m_log.Warn("[GETMESH]: Malformed Range header: " + range);
response.StatusCode = (int)System.Net.HttpStatusCode.BadRequest;
}
}
else
{
// Full content request
response.StatusCode = (int)System.Net.HttpStatusCode.OK;
response.ContentLength = texture.Data.Length;
response.ContentType = "application/vnd.ll.mesh";
response.Body.Write(texture.Data, 0, texture.Data.Length);
}
}
/// <summary>
/// Parse a range header.
/// </summary>
/// <remarks>
/// As per http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html,
/// this obeys range headers with two values (e.g. 533-4165) and no second value (e.g. 533-).
/// Where there is no value, -1 is returned.
/// FIXME: Need to cover the case where only a second value is specified (e.g. -4165), probably by returning -1
/// for start.</remarks>
/// <returns></returns>
/// <param name='header'></param>
/// <param name='start'>Start of the range. Undefined if this was not a number.</param>
/// <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>
private bool TryParseRange(string header, out int start, out int end)
{
start = end = 0;
if (header.StartsWith("bytes="))
{
string[] rangeValues = header.Substring(6).Split('-');
if (rangeValues.Length == 2)
{
if (!Int32.TryParse(rangeValues[0], out start))
return false;
string rawEnd = rangeValues[1];
if (rawEnd == "")
{
end = -1;
return true;
}
else if (Int32.TryParse(rawEnd, out end))
{
return true;
}
}
}
start = end = 0;
return false;
}
}
}
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