PrivateBin/lib/trafficlimiter.php

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<?php
/**
* ZeroBin
*
* a zero-knowledge paste bin
*
* @link http://sebsauvage.net/wiki/doku.php?id=php:zerobin
* @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
* @license http://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
* @version 0.19
*/
/**
* trafficlimiter
*
* Handles traffic limiting, so no user does more than one call per 10 seconds.
*/
class trafficlimiter extends persistence
{
/**
* @access private
* @static
* @var int
*/
private static $_limit = 10;
/**
* set the time limit in seconds
*
* @access public
* @static
* @param int $limit
* @return void
*/
public static function setLimit($limit)
{
self::$_limit = $limit;
}
/**
* traffic limiter
*
* Make sure the IP address makes at most 1 request every 10 seconds.
*
* @access public
* @static
* @param string $ip
* @return bool
*/
public static function canPass($ip)
{
// disable limits if set to less then 1
if (self::$_limit < 1) return true;
$file = 'traffic_limiter.php';
if (!self::_exists($file))
{
self::_store(
$file,
'<?php' . PHP_EOL .
'$GLOBALS[\'traffic_limiter\'] = array();' . PHP_EOL
);
}
$path = self::getPath($file);
require $path;
$now = time();
$tl = $GLOBALS['traffic_limiter'];
// purge file of expired IPs to keep it small
foreach($tl as $key => $time)
{
if ($time + self::$_limit < $now)
{
unset($tl[$key]);
}
}
if (array_key_exists($ip, $tl) && ($tl[$ip] + self::$_limit >= $now))
{
$result = false;
} else {
$tl[$ip] = time();
$result = true;
}
self::_store(
$file,
'<?php' . PHP_EOL .
'$GLOBALS[\'traffic_limiter\'] = ' .
var_export($tl, true) . ';' . PHP_EOL
);
return $result;
}
}