egroupware_official/phpgwapi/inc/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/URI.php
2010-05-03 12:07:18 +00:00

57 lines
1.9 KiB
PHP

<?php
/**
* Validates a URI in CSS syntax, which uses url('http://example.com')
* @note While theoretically speaking a URI in a CSS document could
* be non-embedded, as of CSS2 there is no such usage so we're
* generalizing it. This may need to be changed in the future.
* @warning Since HTMLPurifier_AttrDef_CSS blindly uses semicolons as
* the separator, you cannot put a literal semicolon in
* in the URI. Try percent encoding it, in that case.
*/
class HTMLPurifier_AttrDef_CSS_URI extends HTMLPurifier_AttrDef_URI
{
public function __construct() {
parent::__construct(true); // always embedded
}
public function validate($uri_string, $config, $context) {
// parse the URI out of the string and then pass it onto
// the parent object
$uri_string = $this->parseCDATA($uri_string);
if (strpos($uri_string, 'url(') !== 0) return false;
$uri_string = substr($uri_string, 4);
$new_length = strlen($uri_string) - 1;
if ($uri_string[$new_length] != ')') return false;
$uri = trim(substr($uri_string, 0, $new_length));
if (!empty($uri) && ($uri[0] == "'" || $uri[0] == '"')) {
$quote = $uri[0];
$new_length = strlen($uri) - 1;
if ($uri[$new_length] !== $quote) return false;
$uri = substr($uri, 1, $new_length - 1);
}
$keys = array( '(', ')', ',', ' ', '"', "'");
$values = array('\\(', '\\)', '\\,', '\\ ', '\\"', "\\'");
$uri = str_replace($values, $keys, $uri);
$result = parent::validate($uri, $config, $context);
if ($result === false) return false;
// escape necessary characters according to CSS spec
// except for the comma, none of these should appear in the
// URI at all
$result = str_replace($keys, $values, $result);
return "url('$result')";
}
}
// vim: et sw=4 sts=4