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<?php
/**
* Akeeba Engine
* The modular PHP5 site backup engine
* @copyright Copyright (c)2009-2014 Nicholas K. Dionysopoulos
* @license GNU GPL version 3 or, at your option, any later version
* @package akeebaengine
*
*/
// Protection against direct access
defined('AKEEBAENGINE') or die();
/**
* Temporary files management class. Handles creation, tracking and cleanup.
*/
class AEUtilTempfiles
{
/**
* Creates a randomly-named temporary file, registers it with the temporary
* files management and returns its absolute path
*
* @return string The temporary file name
*/
static function createRegisterTempFile()
{
// Create a randomly named file in the temp directory
$registry = AEFactory::getConfiguration();
$tempFile = tempnam($registry->get('akeeba.basic.output_directory'), 'ak');
// Register it and return its absolute path
$tempName = basename($tempFile);
return AEUtilTempfiles::registerTempFile($tempName);
}
/**
* Registers a temporary file with the Akeeba Engine, storing the list of temporary files
* in another temporary flat database file.
*
* @param string $fileName The path of the file, relative to the temporary directory
*
* @return string The absolute path to the temporary file, for use in file operations
*/
static function registerTempFile($fileName)
{
$configuration = AEFactory::getConfiguration();
$tempFiles = $configuration->get('volatile.tempfiles', false);
if ($tempFiles === false)
{
$tempFiles = array();
}
else
{
$tempFiles = @unserialize($tempFiles);
if ($tempFiles === false)
{
$tempFiles = array();
}
}
if (!in_array($fileName, $tempFiles))
{
$tempFiles[] = $fileName;
$configuration->set('volatile.tempfiles', serialize($tempFiles));
}
return AEUtilFilesystem::TranslateWinPath($configuration->get('akeeba.basic.output_directory') . '/' . $fileName);
}
/**
* Unregister and delete a temporary file
*
* @param string $fileName The filename to unregister and delete
* @param bool $removePrefix The prefix to remove
*
* @return bool
*/
static function unregisterAndDeleteTempFile($fileName, $removePrefix = false)
{
$configuration = AEFactory::getConfiguration();
if ($removePrefix)
{
$fileName = str_replace(AEUtilFilesystem::TranslateWinPath($configuration->get('akeeba.basic.output_directory')), '', $fileName);
if ((substr($fileName, 0, 1) == '/') || (substr($fileName, 0, 1) == '\\'))
{
$fileName = substr($fileName, 1);
}
if ((substr($fileName, -1) == '/') || (substr($fileName, -1) == '\\'))
{
$fileName = substr($fileName, 0, -1);
}
}
// Make sure this file is registered
$configuration = AEFactory::getConfiguration();
$tempFiles = $configuration->get('volatile.tempfiles', false);
if ($tempFiles === false)
{
$tempFiles = array();
}
else
{
$tempFiles = @unserialize($tempFiles);
}
$found = false;
if (!empty($tempFiles))
{
$found = in_array($fileName, $tempFiles);
}
if (!$found)
{
return false;
}
$file = $configuration->get('akeeba.basic.output_directory') . '/' . $fileName;
AEUtilLogger::WriteLog(_AE_LOG_DEBUG, "-- Removing temporary file $fileName");
$platform = strtoupper(PHP_OS);
if ((substr($platform, 0, 6) == 'CYGWIN') || (substr($platform, 0, 3) == 'WIN'))
{
// On Windows we have to chwon() the file first to make it owned by Nobody
AEUtilLogger::WriteLog(_AE_LOG_DEBUG, "-- Windows hack: chowning $fileName");
@chown($file, 600);
}
$result = @self::nullifyAndDelete($file);
// Make sure the file is removed before unregistering it
if (!@file_exists($file))
{
$aPos = array_search($fileName, $tempFiles);
if ($aPos !== false)
{
unset($tempFiles[$aPos]);
$configuration->set('volatile.tempfiles', serialize($tempFiles));
}
}
return $result;
}
/**
* Deletes all temporary files
*
* @return void
*/
static function deleteTempFiles()
{
$configuration = AEFactory::getConfiguration();
$tempFiles = $configuration->get('volatile.tempfiles', false);
if ($tempFiles === false)
{
$tempFiles = array();
}
else
{
$tempFiles = @unserialize($tempFiles);
}
$fileName = null;
if (!empty($tempFiles))
{
foreach ($tempFiles as $fileName)
{
AEUtilLogger::WriteLog(_AE_LOG_DEBUG, "-- Removing temporary file $fileName");
$file = $configuration->get('akeeba.basic.output_directory') . '/' . $fileName;
$platform = strtoupper(PHP_OS);
if ((substr($platform, 0, 6) == 'CYGWIN') || (substr($platform, 0, 3) == 'WIN'))
{
// On Windows we have to chwon() the file first to make it owned by Nobody
@chown($file, 600);
}
$ret = @self::nullifyAndDelete($file);
}
}
$tempFiles = array();
$configuration->set('volatile.tempfiles', serialize($tempFiles));
}
/**
* Nullify the contents of the file and try to delete it as well
*
* @param string $filename The absolute path to the file to delete
*
* @return bool True of the deletion is successful
*/
static function nullifyAndDelete($filename)
{
// Try to nullify (method #1)
$fp = @fopen($filename, 'w');
if (is_resource($fp))
{
@fclose($fp);
}
else
{
// Try to nullify (method #2)
@file_put_contents($filename, '');
}
// Unlink
return @unlink($filename);
}
}