1<?php
2
3/**
4 * Validates shorthand CSS property background.
5 * @warning Does not support url tokens that have internal spaces.
6 */
7class HTMLPurifier_AttrDef_CSS_Background extends HTMLPurifier_AttrDef
8{
9
10    /**
11     * Local copy of component validators.
12     * @type HTMLPurifier_AttrDef[]
13     * @note See HTMLPurifier_AttrDef_Font::$info for a similar impl.
14     */
15    protected $info;
16
17    /**
18     * @param HTMLPurifier_Config $config
19     */
20    public function __construct($config)
21    {
22        $def = $config->getCSSDefinition();
23        $this->info['background-color'] = $def->info['background-color'];
24        $this->info['background-image'] = $def->info['background-image'];
25        $this->info['background-repeat'] = $def->info['background-repeat'];
26        $this->info['background-attachment'] = $def->info['background-attachment'];
27        $this->info['background-position'] = $def->info['background-position'];
28        $this->info['background-size'] = $def->info['background-size'];
29    }
30
31    /**
32     * @param string $string
33     * @param HTMLPurifier_Config $config
34     * @param HTMLPurifier_Context $context
35     * @return bool|string
36     */
37    public function validate($string, $config, $context)
38    {
39        // regular pre-processing
40        $string = $this->parseCDATA($string);
41        if ($string === '') {
42            return false;
43        }
44
45        // munge rgb() decl if necessary
46        $string = $this->mungeRgb($string);
47
48        // assumes URI doesn't have spaces in it
49        $bits = explode(' ', $string); // bits to process
50
51        $caught = array();
52        $caught['color'] = false;
53        $caught['image'] = false;
54        $caught['repeat'] = false;
55        $caught['attachment'] = false;
56        $caught['position'] = false;
57        $caught['size'] = false;
58
59        $i = 0; // number of catches
60
61        foreach ($bits as $bit) {
62            if ($bit === '') {
63                continue;
64            }
65            foreach ($caught as $key => $status) {
66                if ($key != 'position') {
67                    if ($status !== false) {
68                        continue;
69                    }
70                    $r = $this->info['background-' . $key]->validate($bit, $config, $context);
71                } else {
72                    $r = $bit;
73                }
74                if ($r === false) {
75                    continue;
76                }
77                if ($key == 'position') {
78                    if ($caught[$key] === false) {
79                        $caught[$key] = '';
80                    }
81                    $caught[$key] .= $r . ' ';
82                } else {
83                    $caught[$key] = $r;
84                }
85                $i++;
86                break;
87            }
88        }
89
90        if (!$i) {
91            return false;
92        }
93        if ($caught['position'] !== false) {
94            $caught['position'] = $this->info['background-position']->
95                validate($caught['position'], $config, $context);
96        }
97
98        $ret = array();
99        foreach ($caught as $value) {
100            if ($value === false) {
101                continue;
102            }
103            $ret[] = $value;
104        }
105
106        if (empty($ret)) {
107            return false;
108        }
109        return implode(' ', $ret);
110    }
111}
112
113// vim: et sw=4 sts=4
114