1 : <?php
2 :
3 : /**
4 : * Validates shorthand CSS property background.
5 : * @warning Does not support url tokens that have internal spaces.
6 : */
7 1 : class HTMLPurifier_AttrDef_CSS_Background extends HTMLPurifier_AttrDef
8 : {
9 :
10 : /**
11 : * Local copy of component validators.
12 : * @note See HTMLPurifier_AttrDef_Font::$info for a similar impl.
13 : */
14 : protected $info;
15 :
16 : public function __construct($config) {
17 : $def = $config->getCSSDefinition();
18 : $this->info['background-color'] = $def->info['background-color'];
19 : $this->info['background-image'] = $def->info['background-image'];
20 : $this->info['background-repeat'] = $def->info['background-repeat'];
21 : $this->info['background-attachment'] = $def->info['background-attachment'];
22 : $this->info['background-position'] = $def->info['background-position'];
23 : }
24 :
25 : public function validate($string, $config, $context) {
26 :
27 : // regular pre-processing
28 0 : $string = $this->parseCDATA($string);
29 0 : if ($string === '') return false;
30 :
31 : // munge rgb() decl if necessary
32 0 : $string = $this->mungeRgb($string);
33 :
34 : // assumes URI doesn't have spaces in it
35 0 : $bits = explode(' ', strtolower($string)); // bits to process
36 :
37 0 : $caught = array();
38 0 : $caught['color'] = false;
39 0 : $caught['image'] = false;
40 0 : $caught['repeat'] = false;
41 0 : $caught['attachment'] = false;
42 0 : $caught['position'] = false;
43 :
44 0 : $i = 0; // number of catches
45 0 : $none = false;
46 :
47 0 : foreach ($bits as $bit) {
48 0 : if ($bit === '') continue;
49 0 : foreach ($caught as $key => $status) {
50 0 : if ($key != 'position') {
51 0 : if ($status !== false) continue;
52 0 : $r = $this->info['background-' . $key]->validate($bit, $config, $context);
53 0 : } else {
54 0 : $r = $bit;
55 : }
56 0 : if ($r === false) continue;
57 0 : if ($key == 'position') {
58 0 : if ($caught[$key] === false) $caught[$key] = '';
59 0 : $caught[$key] .= $r . ' ';
60 0 : } else {
61 0 : $caught[$key] = $r;
62 : }
63 0 : $i++;
64 0 : break;
65 0 : }
66 0 : }
67 :
68 0 : if (!$i) return false;
69 0 : if ($caught['position'] !== false) {
70 0 : $caught['position'] = $this->info['background-position']->
71 0 : validate($caught['position'], $config, $context);
72 0 : }
73 :
74 0 : $ret = array();
75 0 : foreach ($caught as $value) {
76 0 : if ($value === false) continue;
77 0 : $ret[] = $value;
78 0 : }
79 :
80 0 : if (empty($ret)) return false;
81 0 : return implode(' ', $ret);
82 :
83 : }
84 :
85 : }
86 :
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