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