DocumentServer/DocService/FontService.ashx.cs
2015-08-17 17:19:04 +03:00

364 lines
15 KiB
C#

/*
* (c) Copyright Ascensio System SIA 2010-2015
*
* This program is a free software product. You can redistribute it and/or
* modify it under the terms of the GNU Affero General Public License (AGPL)
* version 3 as published by the Free Software Foundation. In accordance with
* Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect
* that Ascensio System SIA expressly excludes the warranty of non-infringement
* of any third-party rights.
*
* This program is distributed WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For
* details, see the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
*
* You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia,
* EU, LV-1021.
*
* The interactive user interfaces in modified source and object code versions
* of the Program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU AGPL version 3.
*
* Pursuant to Section 7(b) of the License you must retain the original Product
* logo when distributing the program. Pursuant to Section 7(e) we decline to
* grant you any rights under trademark law for use of our trademarks.
*
* All the Product's GUI elements, including illustrations and icon sets, as
* well as technical writing content are licensed under the terms of the
* Creative Commons Attribution-ShareAlike 4.0 International. See the License
* terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
*
*/
using System;
using System.Net;
using System.Configuration;
using System.Web;
using System.Web.Routing;
using System.IO;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using Microsoft.Win32;
using FileConverterUtils2;
using log4net;
namespace DocService
{
public class FontServiceRoute : IRouteHandler
{
public IHttpHandler GetHttpHandler(RequestContext requestContext)
{
return new FontService(requestContext);
}
}
public class FontService : IHttpAsyncHandler
{
private const string gc_sJsExtention = ".js";
private readonly ILog _log = LogManager.GetLogger(typeof(FontServiceRoute));
private string m_sFontName = null;
private readonly static System.Collections.Generic.Dictionary<string, string> m_mapFontNameToFullPath;
static FontService()
{
m_mapFontNameToFullPath = new System.Collections.Generic.Dictionary<string, string>();
string sConfigFontDir = ConfigurationManager.AppSettings["utils.common.fontdir"];
if (null != sConfigFontDir && string.Empty != sConfigFontDir)
{
string sConfigSearchPattern = ConfigurationSettings.AppSettings["utils.fonts.search_patterns"] ?? "*.ttf;*.ttc;*.otf";
InitFontMapByFolder(sConfigFontDir, sConfigSearchPattern);
}
else
{
InitFontMapBySysFont();
}
}
static private void InitFontMapBySysFont()
{
DirectoryInfo dirWindowsFolder = Directory.GetParent(Environment.GetFolderPath(Environment.SpecialFolder.System));
string sWinFontDir = Path.Combine(dirWindowsFolder.FullName, "Fonts");
RegistryKey key = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows NT\CurrentVersion\Fonts");
if (null == key)
key = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Fonts");
if (null != key)
{
string[] aValues = key.GetValueNames();
for (int i = 0, length = aValues.Length; i < length; i++)
{
string sCurPath = key.GetValue(aValues[i]) as string;
if (null != sCurPath && !string.IsNullOrEmpty(sCurPath))
{
if (Path.IsPathRooted(sCurPath))
m_mapFontNameToFullPath[Path.GetFileName(sCurPath).ToUpper()] = sCurPath;
else
m_mapFontNameToFullPath[sCurPath.ToUpper()] = Path.Combine(sWinFontDir, sCurPath);
}
}
}
}
static private void InitFontMapByFolder(string sConfigFontDir, string sConfigSearchPattern)
{
string sFontDir = Environment.ExpandEnvironmentVariables(sConfigFontDir);
char[] aDelemiters = { '|', ',', ';' };
List<string> aSearchPatterns = (sConfigSearchPattern.Split(
aDelemiters, StringSplitOptions.RemoveEmptyEntries)).ToList();
string[] aFontFiles = { };
foreach (string sSearchPattern in aSearchPatterns)
{
aFontFiles = aFontFiles.Concat(Directory.GetFiles(
sFontDir, sSearchPattern, SearchOption.AllDirectories)).ToArray();
}
foreach (string sFontFile in aFontFiles)
{
try
{
m_mapFontNameToFullPath.Add(
Path.GetFileName(sFontFile).ToUpper(), sFontFile);
}
catch (ArgumentException)
{
}
}
}
public FontService(RequestContext context)
{
m_sFontName = Convert.ToString(context.RouteData.Values["fontname"]);
}
public IAsyncResult BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData)
{
bool bStartAsync = false;
try
{
_log.Info("Starting process request...");
_log.Info("fontname: " + m_sFontName);
string sNameToDecode;
if (m_sFontName.Length > gc_sJsExtention.Length && gc_sJsExtention == m_sFontName.Substring(m_sFontName.Length - gc_sJsExtention.Length))
sNameToDecode = m_sFontName.Substring(0, m_sFontName.Length - gc_sJsExtention.Length);
else
sNameToDecode = m_sFontName;
byte[] data_decode = Odtff_fonts.ZBase32Encoder.Decode(sNameToDecode);
string sFontNameDecoded = System.Text.Encoding.UTF8.GetString(data_decode);
_log.Info("fontnameDecoded: " + sFontNameDecoded);
context.Response.Clear();
context.Response.Cache.SetExpires(DateTime.Now.AddMinutes(double.Parse(ConfigurationManager.AppSettings["resource.expires"], Constants.mc_oCultureInfo)));
context.Response.Cache.SetSlidingExpiration(false);
context.Response.Cache.SetCacheability(HttpCacheability.Public);
context.Response.ContentType = Utils.GetMimeType(sFontNameDecoded);
string contentDisposition = Utils.GetContentDisposition(context.Request.UserAgent, context.Request.Browser.Browser, context.Request.Browser.Version, m_sFontName);
context.Response.AppendHeader("Content-Disposition", contentDisposition);
string sRealFontName = sFontNameDecoded;
if (gc_sJsExtention == Path.GetExtension(sRealFontName))
sRealFontName = sRealFontName.Substring(0, sRealFontName.Length - gc_sJsExtention.Length);
string strFilepath;
m_mapFontNameToFullPath.TryGetValue(sRealFontName.ToUpper(), out strFilepath);
FileInfo oFileInfo = new FileInfo(strFilepath);
if (oFileInfo.Exists)
{
DateTime oLastModified = oFileInfo.LastWriteTimeUtc;
string sETag = oLastModified.Ticks.ToString("x");
DateTime oDateTimeUtcNow = DateTime.UtcNow;
if (oLastModified.CompareTo(oDateTimeUtcNow) > 0)
{
_log.DebugFormat("LastModifiedTimeStamp changed from {0} to {1}", oLastModified, oDateTimeUtcNow);
oLastModified = oDateTimeUtcNow;
}
string sRequestIfModifiedSince = context.Request.Headers["If-Modified-Since"];
string sRequestETag = context.Request.Headers["If-None-Match"];
bool bNoModify = false;
if (false == string.IsNullOrEmpty(sRequestETag) || false == string.IsNullOrEmpty(sRequestIfModifiedSince))
{
bool bRequestETag = true;
if (false == string.IsNullOrEmpty(sRequestETag) && sRequestETag != sETag)
bRequestETag = false;
bool bRequestIfModifiedSince = true;
if (false == string.IsNullOrEmpty(sRequestIfModifiedSince))
{
try
{
DateTime oRequestIfModifiedSince = DateTime.ParseExact(sRequestIfModifiedSince, "R", System.Globalization.CultureInfo.InvariantCulture);
if ((oRequestIfModifiedSince - oLastModified).TotalSeconds > 1)
bRequestIfModifiedSince = false;
}
catch
{
bRequestIfModifiedSince = false;
}
}
if (bRequestETag && bRequestIfModifiedSince)
{
context.Response.StatusCode = (int)HttpStatusCode.NotModified;
bNoModify = true;
}
}
if (false == bNoModify)
{
context.Response.Cache.SetETag(sETag);
context.Response.Cache.SetLastModified(oLastModified.ToLocalTime());
FileStream oFileStreamInput = new FileStream(strFilepath, FileMode.Open, FileAccess.Read, FileShare.Read, (int)oFileInfo.Length, true);
byte[] aBuffer = new byte[oFileStreamInput.Length];
TransportClass oTransportClass = new TransportClass(context, cb, oFileStreamInput, aBuffer, sFontNameDecoded);
oFileStreamInput.BeginRead(aBuffer, 0, aBuffer.Length, ReadFileCallback, oTransportClass);
bStartAsync = true;
}
}
else
context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
}
catch(Exception e)
{
context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
_log.Error(context.Request.QueryString.ToString());
_log.Error("Exeption catched in BeginProcessRequest:", e);
}
TransportClass oTempTransportClass = new TransportClass(context, cb, null, null, null);
if (false == bStartAsync)
cb(new AsyncOperationData(oTempTransportClass));
return new AsyncOperationData(oTempTransportClass);
}
public void EndProcessRequest(IAsyncResult result)
{
}
public void ProcessRequest(HttpContext context)
{
throw new InvalidOperationException();
}
public bool IsReusable
{
get
{
return false;
}
}
private void ReadFileCallback(IAsyncResult result)
{
TransportClass oTransportClass = result.AsyncState as TransportClass;
HttpContext context = oTransportClass.m_oContext;
try
{
FileStream oFileStreamInput = oTransportClass.m_oFileStreamInput;
oTransportClass.nReadWriteBytes = oFileStreamInput.EndRead(result);
oFileStreamInput.Dispose();
if (oTransportClass.nReadWriteBytes <= 0)
{
context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
oTransportClass.m_oCallback(new AsyncOperationData(oTransportClass));
}
else
{
byte[] aOutput = null;
if (gc_sJsExtention == Path.GetExtension(oTransportClass.m_sFontNameDecoded))
{
aOutput = GetJsContent(oTransportClass.m_aBuffer, oTransportClass.m_sFontNameDecoded.Substring(0, oTransportClass.m_sFontNameDecoded.Length - gc_sJsExtention.Length));
oTransportClass.nReadWriteBytes = aOutput.Length;
}
else
{
aOutput = oTransportClass.m_aBuffer;
byte[] guidOdttf = {0xA0, 0x66, 0xD6, 0x20, 0x14, 0x96, 0x47, 0xfa, 0x95, 0x69, 0xB8, 0x50, 0xB0, 0x41, 0x49, 0x48};
int nMaxLen = Math.Min(32, aOutput.Length);
for (int i = 0; i < nMaxLen; ++i)
aOutput[i] ^= guidOdttf[i % 16];
}
context.Response.OutputStream.BeginWrite(aOutput, 0, aOutput.Length, WriteBufferCallback, oTransportClass);
}
}
catch (Exception e)
{
context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
oTransportClass.m_oCallback(new AsyncOperationData(oTransportClass));
_log.Error("Exception catched in ReadFileCallback:", e);
}
}
private void WriteBufferCallback(IAsyncResult result)
{
TransportClass oTransportClass = result.AsyncState as TransportClass;
HttpContext context = oTransportClass.m_oContext;
try
{
context.Response.OutputStream.EndWrite(result);
context.Response.AppendHeader("Content-Length", oTransportClass.nReadWriteBytes.ToString());
context.Response.StatusCode = (int)HttpStatusCode.OK;
}
catch (HttpException httpEx)
{
_log.Error("HttpException catched in WriteBufferCallback:", httpEx);
}
catch (Exception e)
{
_log.Error("Exception catched in WriteBufferCallback:", e);
context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
}
try
{
if (context.Response.IsClientConnected)
{
context.Response.Flush();
}
}
catch (Exception e)
{
_log.Error("Exception catched in WriteBufferCallback, while response end:", e);
}
finally
{
try
{
oTransportClass.m_oCallback(new AsyncOperationData(oTransportClass));
}
catch(Exception e)
{
_log.Error("Exception catched in WriteBufferCallback, while callback:", e);
}
}
}
private byte[] GetJsContent(byte[] aBuffer, string sFilename)
{
string data = Convert.ToBase64String(aBuffer);
string sRes = string.Format("window[\"{0}\"] = \"{1};{2}\";", sFilename, aBuffer.Length, data);
return Encoding.UTF8.GetBytes(sRes);
}
private class TransportClass
{
public HttpContext m_oContext;
public AsyncCallback m_oCallback;
public FileStream m_oFileStreamInput;
public byte[] m_aBuffer;
public int nReadWriteBytes;
public string m_sFontNameDecoded;
public TransportClass(HttpContext oContext, AsyncCallback oCallback, FileStream oFileStreamInput, byte[] aBuffer, string sFontNameDecoded)
{
m_oContext = oContext;
m_oCallback = oCallback;
m_oFileStreamInput = oFileStreamInput;
m_aBuffer = aBuffer;
m_sFontNameDecoded = sFontNameDecoded;
}
}
}
}