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/*
KeePass Password Safe - The Open-Source Password Manager
Copyright (C) 2003-2012 Dominik Reichl <dominik.reichl@t-online.de>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Diagnostics;
#if !KeePassLibSD
using System.Security.AccessControl;
#endif
using KeePassLib.Utility;
namespace KeePassLib.Serialization
{
public sealed class FileTransactionEx
{
private bool m_bTransacted;
private IOConnectionInfo m_iocBase;
private IOConnectionInfo m_iocTemp;
private bool m_bMadeUnhidden = false;
private const string StrTempSuffix = ".tmp";
public FileTransactionEx(IOConnectionInfo iocBaseFile)
{
Initialize(iocBaseFile, true);
}
public FileTransactionEx(IOConnectionInfo iocBaseFile, bool bTransacted)
{
Initialize(iocBaseFile, bTransacted);
}
private void Initialize(IOConnectionInfo iocBaseFile, bool bTransacted)
{
if(iocBaseFile == null) throw new ArgumentNullException("iocBaseFile");
m_bTransacted = bTransacted;
m_iocBase = iocBaseFile.CloneDeep();
if(m_bTransacted)
{
m_iocTemp = m_iocBase.CloneDeep();
m_iocTemp.Path += StrTempSuffix;
}
else m_iocTemp = m_iocBase;
}
public Stream OpenWrite()
{
if(!m_bTransacted) m_bMadeUnhidden = UrlUtil.UnhideFile(m_iocTemp.Path);
else // m_bTransacted
{
try { IOConnection.DeleteFile(m_iocTemp); }
catch(Exception) { }
}
return IOConnection.OpenWrite(m_iocTemp);
}
public void CommitWrite()
{
if(m_bTransacted) CommitWriteTransaction();
else // !m_bTransacted
{
if(m_bMadeUnhidden) UrlUtil.HideFile(m_iocTemp.Path, true); // Hide again
}
}
private void CommitWriteTransaction()
{
bool bMadeUnhidden = UrlUtil.UnhideFile(m_iocBase.Path);
#if !KeePassLibSD
FileSecurity bkSecurity = null;
bool bEfsEncrypted = false;
#endif
if(IOConnection.FileExists(m_iocBase))
{
#if !KeePassLibSD
if(m_iocBase.IsLocalFile())
{
try
{
FileAttributes faBase = File.GetAttributes(m_iocBase.Path);
bEfsEncrypted = ((long)(faBase & FileAttributes.Encrypted) != 0);
DateTime tCreation = File.GetCreationTime(m_iocBase.Path);
bkSecurity = File.GetAccessControl(m_iocBase.Path);
File.SetCreationTime(m_iocTemp.Path, tCreation);
}
catch(Exception) { Debug.Assert(false); }
}
#endif
IOConnection.DeleteFile(m_iocBase);
}
IOConnection.RenameFile(m_iocTemp, m_iocBase);
#if !KeePassLibSD
if(m_iocBase.IsLocalFile())
{
try
{
if(bEfsEncrypted)
{
try { File.Encrypt(m_iocBase.Path); }
catch(Exception) { Debug.Assert(false); }
}
if(bkSecurity != null)
File.SetAccessControl(m_iocBase.Path, bkSecurity);
}
catch(Exception) { Debug.Assert(false); }
}
#endif
if(bMadeUnhidden) UrlUtil.HideFile(m_iocBase.Path, true); // Hide again
}
}
}
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