File xoops_lib\modules\protector\library\HTMLPurifier\AttrDef\CSS\URI.php

1:	<?php
2:
3:	/**
4:	* Validates a URI in CSS syntax, which uses url('http://example.com')
5:	* @note While theoretically speaking a URI in a CSS document could
6:	* be non-embedded, as of CSS2 there is no such usage so we're
7:	* generalizing it. This may need to be changed in the future.
8:	* @warning Since HTMLPurifier_AttrDef_CSS blindly uses semicolons as
9:	* the separator, you cannot put a literal semicolon in
10:	* in the URI. Try percent encoding it, in that case.
11:	*/
12:	class HTMLPurifier_AttrDef_CSS_URI extends HTMLPurifier_AttrDef_URI
13:	{
14:
15:	public function __construct()
16:	{
17:	parent::__construct(true); // always embedded
18:	}
19:
20:	/**
21:	* @param string $uri_string
22:	* @param HTMLPurifier_Config $config
23:	* @param HTMLPurifier_Context $context
24:	* @return bool\|string
25:	*/
26:	public function validate($uri_string, $config, $context)
27:	{
28:	// parse the URI out of the string and then pass it onto
29:	// the parent object
30:
31:	$uri_string = $this->parseCDATA($uri_string);
32:	if (strpos($uri_string, 'url(') !== 0) {
33:	return false;
34:	}
35:	$uri_string = substr($uri_string, 4);
36:	if (strlen($uri_string) == 0) {
37:	return false;
38:	}
39:	$new_length = strlen($uri_string) - 1;
40:	if ($uri_string[$new_length] != ')') {
41:	return false;
42:	}
43:	$uri = trim(substr($uri_string, 0, $new_length));
44:
45:	if (!empty($uri) && ($uri[0] == "'" \|\| $uri[0] == '"')) {
46:	$quote = $uri[0];
47:	$new_length = strlen($uri) - 1;
48:	if ($uri[$new_length] !== $quote) {
49:	return false;
50:	}
51:	$uri = substr($uri, 1, $new_length - 1);
52:	}
53:
54:	$uri = $this->expandCSSEscape($uri);
55:
56:	$result = parent::validate($uri, $config, $context);
57:
58:	if ($result === false) {
59:	return false;
60:	}
61:
62:	// extra sanity check; should have been done by URI
63:	$result = str_replace(array('"', "\\", "\n", "\x0c", "\r"), "", $result);
64:
65:	// suspicious characters are ()'; we're going to percent encode
66:	// them for safety.
67:	$result = str_replace(array('(', ')', "'"), array('%28', '%29', '%27'), $result);
68:
69:	// there's an extra bug where ampersands lose their escaping on
70:	// an innerHTML cycle, so a very unlucky query parameter could
71:	// then change the meaning of the URL. Unfortunately, there's
72:	// not much we can do about that...
73:	return "url(\"$result\")";
74:	}
75:	}
76:
77:	// vim: et sw=4 sts=4
78:

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