PrivateBin/lib/purgelimiter.php

100 lines
2.1 KiB
PHP

<?php
/**
* PrivateBin
*
* a zero-knowledge paste bin
*
* @link https://github.com/PrivateBin/PrivateBin
* @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
* @license http://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
* @version 0.22
*/
/**
* purgelimiter
*
* Handles purge limiting, so purging is not triggered to often.
*/
class purgelimiter extends persistence
{
/**
* time limit in seconds, defaults to 300s
*
* @access private
* @static
* @var int
*/
private static $_limit = 300;
/**
* set the time limit in seconds
*
* @access public
* @static
* @param int $limit
* @return void
*/
public static function setLimit($limit)
{
self::$_limit = $limit;
}
/**
* set configuration options of the traffic limiter
*
* @access public
* @static
* @param configuration $conf
* @return void
*/
public static function setConfiguration(configuration $conf)
{
self::setLimit($conf->getKey('limit', 'purge'));
self::setPath($conf->getKey('dir', 'purge'));
}
/**
* check if the purge can be performed
*
* @access public
* @static
* @throws Exception
* @return bool
*/
public static function canPurge()
{
// disable limits if set to less then 1
if (self::$_limit < 1) return true;
$file = 'purge_limiter.php';
$now = time();
if (!self::_exists($file))
{
self::_store(
$file,
'<?php' . PHP_EOL .
'$GLOBALS[\'purge_limiter\'] = ' . $now . ';' . PHP_EOL
);
}
$path = self::getPath($file);
require $path;
$pl = $GLOBALS['purge_limiter'];
if ($pl + self::$_limit >= $now)
{
$result = false;
}
else
{
$result = true;
self::_store(
$file,
'<?php' . PHP_EOL .
'$GLOBALS[\'purge_limiter\'] = ' . $now . ';' . PHP_EOL
);
}
return $result;
}
}