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[3.1.1] Implement more robust imagecrash protection for CSS width/height.

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- Change API for HTMLPurifier_AttrDef_CSS_Length
- Implement HTMLPurifier_AttrDef_Switch class
- Implement HTMLPurifier_Length->compareTo, and make make() accept object instances

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1754 48356398-32a2-884e-a903-53898d9a118a
This commit is contained in:
Edward Z. Yang
2008-05-21 01:56:48 +00:00
parent c3fab7200e
commit 1a95852007
15 changed files with 208 additions and 27 deletions
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25
library/HTMLPurifier/AttrDef/CSS/Length.php
View File

@@ -6,14 +6,15 @@
class HTMLPurifier_AttrDef_CSS_Length extends HTMLPurifier_AttrDef
{
protected $nonNegative;
protected $min, $max;
/**
* @param $non_negative Bool indication whether or not negative values are
* allowed.
* @param HTMLPurifier_Length $max Minimum length, or null for no bound. String is also acceptable.
* @param HTMLPurifier_Length $max Maximum length, or null for no bound. String is also acceptable.
*/
public function __construct($non_negative = false) {
$this->nonNegative = $non_negative;
public function __construct($min = null, $max = null) {
$this->min = $min !== null ? HTMLPurifier_Length::make($min) : null;
$this->max = $max !== null ? HTMLPurifier_Length::make($max) : null;
}
public function validate($string, $config, $context) {
@@ -25,10 +26,18 @@ class HTMLPurifier_AttrDef_CSS_Length extends HTMLPurifier_AttrDef
if (strlen($string) === 1) return false;
$length = HTMLPurifier_Length::make($string);
if (!$length->isValid($this->nonNegative)) return false;
if (!$length->isValid()) return false;
$n = $length->getN();
if ($this->nonNegative && $n < 0) return false;
if ($this->min) {
$c = $length->compareTo($this->min);
if ($c === false) return false;
if ($c < 0) return false;
}
if ($this->max) {
$c = $length->compareTo($this->max);
if ($c === false) return false;
if ($c > 0) return false;
}
return $length->toString();
}

32
library/HTMLPurifier/AttrDef/Switch.php Normal file
View File

@@ -0,0 +1,32 @@
<?php
/**
* Decorator that, depending on a token, switches between two definitions.
*/
class HTMLPurifier_AttrDef_Switch
{
protected $tag;
protected $withTag, $withoutTag;
/**
* @param string $tag Tag name to switch upon
* @param HTMLPurifier_AttrDef $with_tag Call if token matches tag
* @param HTMLPurifier_AttrDef $without_tag Call if token doesn't match, or there is no token
*/
public function __construct($tag, $with_tag, $without_tag) {
$this->tag = $tag;
$this->withTag = $with_tag;
$this->withoutTag = $without_tag;
}
public function validate($string, $config, $context) {
$token = $context->get('CurrentToken', true);
if (!$token || $token->name !== $this->tag) {
return $this->withoutTag->validate($string, $config, $context);
} else {
return $this->withTag->validate($string, $config, $context);
}
}
}