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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Polyfill\Php56;
use Symfony\Polyfill\Util\Binary;
/**
* @internal
*/
final class Php56
{
const LDAP_ESCAPE_FILTER = 1;
const LDAP_ESCAPE_DN = 2;
public static function hash_equals($knownString, $userInput)
{
if (!is_string($knownString)) {
trigger_error('Expected known_string to be a string, '.gettype($knownString).' given', E_USER_WARNING);
return false;
}
if (!is_string($userInput)) {
trigger_error('Expected user_input to be a string, '.gettype($userInput).' given', E_USER_WARNING);
return false;
}
$knownLen = Binary::strlen($knownString);
$userLen = Binary::strlen($userInput);
if ($knownLen !== $userLen) {
return false;
}
$result = 0;
for ($i = 0; $i < $knownLen; ++$i) {
$result |= ord($knownString[$i]) ^ ord($userInput[$i]);
}
return 0 === $result;
}
/**
* Stub implementation of the {@link ldap_escape()} function of the ldap
* extension.
*
* Escape strings for safe use in LDAP filters and DNs.
*
* @author Chris Wright <ldapi@daverandom.com>
*
* @param string $subject
* @param string $ignore
* @param int $flags
*
* @return string
*
* @see http://stackoverflow.com/a/8561604
*/
public static function ldap_escape($subject, $ignore = '', $flags = 0)
{
static $charMaps = null;
if (null === $charMaps) {
$charMaps = array(
self::LDAP_ESCAPE_FILTER => array('\\', '*', '(', ')', "\x00"),
self::LDAP_ESCAPE_DN => array('\\', ',', '=', '+', '<', '>', ';', '"', '#', "\r"),
);
$charMaps[0] = array();
for ($i = 0; $i < 256; ++$i) {
$charMaps[0][chr($i)] = sprintf('\\%02x', $i);
}
for ($i = 0, $l = count($charMaps[self::LDAP_ESCAPE_FILTER]); $i < $l; ++$i) {
$chr = $charMaps[self::LDAP_ESCAPE_FILTER][$i];
unset($charMaps[self::LDAP_ESCAPE_FILTER][$i]);
$charMaps[self::LDAP_ESCAPE_FILTER][$chr] = $charMaps[0][$chr];
}
for ($i = 0, $l = count($charMaps[self::LDAP_ESCAPE_DN]); $i < $l; ++$i) {
$chr = $charMaps[self::LDAP_ESCAPE_DN][$i];
unset($charMaps[self::LDAP_ESCAPE_DN][$i]);
$charMaps[self::LDAP_ESCAPE_DN][$chr] = $charMaps[0][$chr];
}
}
// Create the base char map to escape
$flags = (int) $flags;
$charMap = array();
if ($flags & self::LDAP_ESCAPE_FILTER) {
$charMap += $charMaps[self::LDAP_ESCAPE_FILTER];
}
if ($flags & self::LDAP_ESCAPE_DN) {
$charMap += $charMaps[self::LDAP_ESCAPE_DN];
}
if (!$charMap) {
$charMap = $charMaps[0];
}
// Remove any chars to ignore from the list
$ignore = (string) $ignore;
for ($i = 0, $l = strlen($ignore); $i < $l; ++$i) {
unset($charMap[$ignore[$i]]);
}
// Do the main replacement
$result = strtr($subject, $charMap);
// Encode leading/trailing spaces if self::LDAP_ESCAPE_DN is passed
if ($flags & self::LDAP_ESCAPE_DN) {
if ($result[0] === ' ') {
$result = '\\20'.substr($result, 1);
}
if ($result[strlen($result) - 1] === ' ') {
$result = substr($result, 0, -1).'\\20';
}
}
return $result;
}
}
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