90 lines
2.3 KiB
PHP
90 lines
2.3 KiB
PHP
<?php
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/**
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* PrivateBin
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*
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* a zero-knowledge paste bin
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*
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* @link https://github.com/PrivateBin/PrivateBin
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* @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
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* @license https://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
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* @version 1.2.1
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*/
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namespace PrivateBin;
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use Exception;
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/**
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* Filter
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*
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* Provides data filtering functions.
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*/
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class Filter
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{
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/**
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* format a given time string into a human readable label (localized)
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*
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* accepts times in the format "[integer][time unit]"
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*
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* @access public
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* @static
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* @param string $time
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* @throws Exception
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* @return string
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*/
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public static function formatHumanReadableTime($time)
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{
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if (preg_match('/^(\d+) *(\w+)$/', $time, $matches) !== 1) {
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throw new Exception("Error parsing time format '$time'", 30);
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}
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switch ($matches[2]) {
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case 'sec':
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$unit = 'second';
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break;
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case 'min':
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$unit = 'minute';
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break;
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default:
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$unit = rtrim($matches[2], 's');
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}
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return I18n::_(array('%d ' . $unit, '%d ' . $unit . 's'), (int) $matches[1]);
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}
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/**
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* format a given number of bytes in IEC 80000-13:2008 notation (localized)
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*
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* @access public
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* @static
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* @param int $size
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* @return string
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*/
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public static function formatHumanReadableSize($size)
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{
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$iec = array('B', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB');
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$i = 0;
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while (($size / 1024) >= 1) {
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$size = $size / 1024;
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++$i;
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}
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return number_format($size, ($i ? 2 : 0), '.', ' ') . ' ' . I18n::_($iec[$i]);
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}
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/**
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* fixed time string comparison operation to prevent timing attacks
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* https://crackstation.net/hashing-security.htm?=rd#slowequals
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*
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* @access public
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* @static
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* @param string $a
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* @param string $b
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* @return bool
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*/
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public static function slowEquals($a, $b)
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{
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$diff = strlen($a) ^ strlen($b);
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for ($i = 0; $i < strlen($a) && $i < strlen($b); ++$i) {
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$diff |= ord($a[$i]) ^ ord($b[$i]);
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}
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return $diff === 0;
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}
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}
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