mirror of
https://github.com/ezyang/htmlpurifier.git
synced 2025-01-08 23:11:52 +00:00
44 lines
1.3 KiB
PHP
44 lines
1.3 KiB
PHP
|
<?php
|
||
|
|
|
||
|
|
class HTMLPurifier_PercentEncoder
|
||
|
|
{
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Fix up percent-encoding by decoding unreserved characters and normalizing
|
||
|
|
* @param $string String to normalize
|
||
|
|
*/
|
||
|
|
function normalize($string) {
|
||
|
|
if ($string == '') return '';
|
||
|
|
$parts = explode('%', $string);
|
||
|
|
$ret = array_shift($parts);
|
||
|
|
foreach ($parts as $part) {
|
||
|
|
$length = strlen($part);
|
||
|
|
if ($length < 2) {
|
||
|
|
$ret .= '%25' . $part;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
$encoding = substr($part, 0, 2);
|
||
|
|
$text = substr($part, 2);
|
||
|
|
if (!ctype_xdigit($encoding)) {
|
||
|
|
$ret .= '%25' . $part;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
$int = hexdec($encoding);
|
||
|
|
if (
|
||
|
|
($int >= 48 && $int <= 57) || // digits
|
||
|
|
($int >= 65 && $int <= 90) || // uppercase letters
|
||
|
|
($int >= 97 && $int <= 122) || // lowercase letters
|
||
|
|
$int == 126 || $int == 45 || $int == 46 || $int == 95 // ~-._
|
||
|
|
) {
|
||
|
|
$ret .= chr($int) . $text;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
$encoding = strtoupper($encoding);
|
||
|
|
$ret .= '%' . $encoding . $text;
|
||
|
|
}
|
||
|
|
return $ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
?>
|