253 lines
11 KiB
C#
253 lines
11 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 log4net;
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using OpenMetaverse;
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using OpenMetaverse.Imaging;
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using OpenSim.Framework;
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using OpenSim.Framework.Servers.HttpServer;
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using OpenSim.Services.Interfaces;
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using System;
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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.IO;
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using System.Reflection;
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using System.Web;
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namespace OpenSim.Capabilities.Handlers
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{
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public class GetMeshHandler : BaseStreamHandler
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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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// TODO: Change this to a config option
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private string m_RedirectURL = null;
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public GetMeshHandler(string path, IAssetService assService, string name, string description, string redirectURL)
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: base("GET", path, name, description)
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{
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m_assetService = assService;
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m_RedirectURL = redirectURL;
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if (m_RedirectURL != null && !m_RedirectURL.EndsWith("/"))
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m_RedirectURL += "/";
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}
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protected override byte[] ProcessRequest(string path, Stream request, IOSHttpRequest httpRequest, IOSHttpResponse httpResponse)
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{
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// Try to parse the texture ID from the request URL
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NameValueCollection query = HttpUtility.ParseQueryString(httpRequest.Url.Query);
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string textureStr = query.GetOne("mesh_id");
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if (m_assetService == null)
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{
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m_log.Error("[GETMESH]: Cannot fetch mesh " + textureStr + " without an asset service");
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httpResponse.StatusCode = (int)System.Net.HttpStatusCode.NotFound;
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}
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UUID meshID;
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if (!String.IsNullOrEmpty(textureStr) && UUID.TryParse(textureStr, out meshID))
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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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httpResponse.StatusCode = (int)System.Net.HttpStatusCode.NotFound;
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AssetBase mesh;
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if (!String.IsNullOrEmpty(m_RedirectURL))
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{
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// Only try to fetch locally cached meshes. Misses are redirected
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mesh = m_assetService.GetCached(meshID.ToString());
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if (mesh != null)
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{
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if (mesh.Type != (sbyte)AssetType.Mesh)
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{
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httpResponse.StatusCode = (int)System.Net.HttpStatusCode.NotFound;
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}
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WriteMeshData(httpRequest, httpResponse, mesh);
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}
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else
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{
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string textureUrl = m_RedirectURL + "?mesh_id="+ meshID.ToString();
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m_log.Debug("[GETMESH]: Redirecting mesh request to " + textureUrl);
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httpResponse.StatusCode = (int)OSHttpStatusCode.RedirectMovedPermanently;
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httpResponse.RedirectLocation = textureUrl;
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return null;
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}
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}
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else // no redirect
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{
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// try the cache
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mesh = m_assetService.GetCached(meshID.ToString());
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if (mesh == null)
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{
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// Fetch locally or remotely. Misses return a 404
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mesh = m_assetService.Get(meshID.ToString());
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if (mesh != null)
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{
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if (mesh.Type != (sbyte)AssetType.Mesh)
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{
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httpResponse.StatusCode = (int)System.Net.HttpStatusCode.NotFound;
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return null;
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}
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WriteMeshData(httpRequest, httpResponse, mesh);
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return null;
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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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if (mesh.Type != (sbyte)AssetType.Mesh)
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{
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httpResponse.StatusCode = (int)System.Net.HttpStatusCode.NotFound;
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return null;
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}
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WriteMeshData(httpRequest, httpResponse, mesh);
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return null;
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}
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}
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// not found
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httpResponse.StatusCode = (int)System.Net.HttpStatusCode.NotFound;
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return null;
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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 mesh_id from GetMesh request: " + httpRequest.Url);
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}
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return null;
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}
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private void WriteMeshData(IOSHttpRequest request, IOSHttpResponse response, AssetBase texture)
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{
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string range = request.Headers.GetOne("Range");
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if (!String.IsNullOrEmpty(range))
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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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response.StatusCode = (int)System.Net.HttpStatusCode.PartialContent;
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response.ContentType = texture.Metadata.ContentType;
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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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if (0 == start && len == texture.Data.Length)
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{
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response.StatusCode = (int)System.Net.HttpStatusCode.OK;
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}
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else
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{
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response.StatusCode = (int)System.Net.HttpStatusCode.PartialContent;
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response.AddHeader("Content-Range", String.Format("bytes {0}-{1}/{2}", start, end, texture.Data.Length));
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}
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response.ContentLength = len;
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response.ContentType = "application/vnd.ll.mesh";
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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("[GETMESH]: Malformed Range header: " + range);
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response.StatusCode = (int)System.Net.HttpStatusCode.BadRequest;
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}
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}
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else
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{
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// Full content request
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response.StatusCode = (int)System.Net.HttpStatusCode.OK;
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response.ContentLength = texture.Data.Length;
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response.ContentType = "application/vnd.ll.mesh";
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response.Body.Write(texture.Data, 0, texture.Data.Length);
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}
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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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}
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} |