mirror of
https://github.com/EGroupware/egroupware.git
synced 2024-12-05 22:30:42 +01:00
88 lines
3.0 KiB
PHP
88 lines
3.0 KiB
PHP
|
<?php
|
||
|
|
||
|
/**
|
||
|
* Validates the HTML attribute style, otherwise known as CSS.
|
||
|
* @note We don't implement the whole CSS specification, so it might be
|
||
|
* difficult to reuse this component in the context of validating
|
||
|
* actual stylesheet declarations.
|
||
|
* @note If we were really serious about validating the CSS, we would
|
||
|
* tokenize the styles and then parse the tokens. Obviously, we
|
||
|
* are not doing that. Doing that could seriously harm performance,
|
||
|
* but would make these components a lot more viable for a CSS
|
||
|
* filtering solution.
|
||
|
*/
|
||
|
class HTMLPurifier_AttrDef_CSS extends HTMLPurifier_AttrDef
|
||
|
{
|
||
|
|
||
|
public function validate($css, $config, $context) {
|
||
|
|
||
|
$css = $this->parseCDATA($css);
|
||
|
|
||
|
$definition = $config->getCSSDefinition();
|
||
|
|
||
|
// we're going to break the spec and explode by semicolons.
|
||
|
// This is because semicolon rarely appears in escaped form
|
||
|
// Doing this is generally flaky but fast
|
||
|
// IT MIGHT APPEAR IN URIs, see HTMLPurifier_AttrDef_CSSURI
|
||
|
// for details
|
||
|
|
||
|
$declarations = explode(';', $css);
|
||
|
$propvalues = array();
|
||
|
|
||
|
/**
|
||
|
* Name of the current CSS property being validated.
|
||
|
*/
|
||
|
$property = false;
|
||
|
$context->register('CurrentCSSProperty', $property);
|
||
|
|
||
|
foreach ($declarations as $declaration) {
|
||
|
if (!$declaration) continue;
|
||
|
if (!strpos($declaration, ':')) continue;
|
||
|
list($property, $value) = explode(':', $declaration, 2);
|
||
|
$property = trim($property);
|
||
|
$value = trim($value);
|
||
|
$ok = false;
|
||
|
do {
|
||
|
if (isset($definition->info[$property])) {
|
||
|
$ok = true;
|
||
|
break;
|
||
|
}
|
||
|
if (ctype_lower($property)) break;
|
||
|
$property = strtolower($property);
|
||
|
if (isset($definition->info[$property])) {
|
||
|
$ok = true;
|
||
|
break;
|
||
|
}
|
||
|
} while(0);
|
||
|
if (!$ok) continue;
|
||
|
// inefficient call, since the validator will do this again
|
||
|
if (strtolower(trim($value)) !== 'inherit') {
|
||
|
// inherit works for everything (but only on the base property)
|
||
|
$result = $definition->info[$property]->validate(
|
||
|
$value, $config, $context );
|
||
|
} else {
|
||
|
$result = 'inherit';
|
||
|
}
|
||
|
if ($result === false) continue;
|
||
|
$propvalues[$property] = $result;
|
||
|
}
|
||
|
|
||
|
$context->destroy('CurrentCSSProperty');
|
||
|
|
||
|
// procedure does not write the new CSS simultaneously, so it's
|
||
|
// slightly inefficient, but it's the only way of getting rid of
|
||
|
// duplicates. Perhaps config to optimize it, but not now.
|
||
|
|
||
|
$new_declarations = '';
|
||
|
foreach ($propvalues as $prop => $value) {
|
||
|
$new_declarations .= "$prop:$value;";
|
||
|
}
|
||
|
|
||
|
return $new_declarations ? $new_declarations : false;
|
||
|
|
||
|
}
|
||
|
|
||
|
}
|
||
|
|
||
|
// vim: et sw=4 sts=4
|