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<?php
/**
* Akeeba Engine
* The modular PHP5 site backup engine
* @copyright Copyright (c)2009-2012 Nicholas K. Dionysopoulos
* @license GNU GPL version 3 or, at your option, any later version
* @package akeebaengine
* @version $Id$
*/
// Protection against direct access
defined('AKEEBAENGINE') or die('Restricted access');
/**
* Temporary variables management class. Everything is stored serialized in an INI
* file on the temporary directory.
*/
class AEUtilTempvars
{
static $storageEngine = '';
static public function getStorageEngine()
{
if(empty(self::$storageEngine)) self::setStorageEngine();
return self::$storageEngine;
}
static public function setStorageEngine($engine = null)
{
if(empty($engine)) {
$config = AEFactory::getConfiguration();
$usedb = $config->get('akeeba.core.usedbstorage', 0);
$engine = $usedb ? 'db' : 'file';
}
self::$storageEngine = $engine;
}
/**
* Returns the fully qualified path to the storage file
* @return unknown_type
*/
static public function get_storage_filename($tag = null)
{
static $basepath = null;
if(self::getStorageEngine() == 'db') {
return empty($tag) ? 'storage' : $tag;
} else {
if(is_null($basepath)) {
$registry =& AEFactory::getConfiguration();
$basepath = $registry->get('akeeba.basic.output_directory').DIRECTORY_SEPARATOR;
}
if(empty($tag)) $tag='storage';
return $basepath.'akeeba_'.$tag.'.php';
}
}
/**
* Resets the storage. This method removes all stored values.
* @return bool True on success
*/
public static function reset($tag = null)
{
switch(self::getStorageEngine()) {
case 'file':
$filename = self::get_storage_filename($tag);
if(!is_file($filename) && !is_link($filename)) return false;
return @unlink(self::get_storage_filename($tag));
break;
case 'db':
$dbtag = self::get_storage_filename($tag);
$db = AEFactory::getDatabase();
$sql = 'DELETE FROM `#__ak_storage` WHERE `tag` = '.$db->Quote($dbtag);
$db->setQuery($sql);
return $db->query();
break;
}
}
public static function set(&$value, $tag = null)
{
$storage_filename = self::get_storage_filename($tag);
switch(self::getStorageEngine()) {
case 'file':
// Remove old file (if exists)
if(file_exists($storage_filename)) @unlink($storage_filename);
// Open the new file
$fp = @fopen($storage_filename, 'wb');
if( $fp === false ) return false;
// Add a header
fputs($fp, "<?php die('Access denied'); ?>\n");
fwrite($fp, self::encode($value));
fclose($fp);
return true;
break;
case 'db':
$db = AEFactory::getDatabase();
$sql = 'REPLACE INTO `#__ak_storage` (`tag`,`data`) VALUES('.$db->Quote($storage_filename).
','.$db->Quote(self::encode($value)).')';
$db->setQuery($sql);
return $db->query();
break;
}
}
public static function &get($tag = null)
{
$storage_filename = self::get_storage_filename($tag);
$ret = false;
switch(self::getStorageEngine()) {
case 'file':
$rawdata = @file_get_contents($storage_filename);
if($rawdata === false) return $ret;
if(strpos($rawdata,"\n") === false) return $ret;
list($header, $data) = explode("\n", $rawdata);
unset($rawdata);
unset($header);
break;
case 'db':
$db = AEFactory::getDatabase();
$sql = 'SELECT `data` FROM `#__ak_storage` WHERE `tag` = '.$db->Quote($storage_filename);
$db->setQuery($sql);
$data = $db->loadResult();
break;
}
$ret = self::decode($data);
unset($data);
return $ret;
}
public static function encode(&$data)
{
// Should I base64-encode?
if( function_exists('base64_encode') && function_exists('base64_decode') ) {
return base64_encode($data);
} elseif( function_exists('convert_uuencode') && function_exists('convert_uudecode') ) {
return convert_uuencode($data);
} else return $data;
}
public static function decode(&$data)
{
if( function_exists('base64_encode') && function_exists('base64_decode') ) {
return base64_decode($data);
} elseif( function_exists('convert_uuencode') && function_exists('convert_uudecode') ) {
return convert_uudecode($data);
} else return $data;
}
}