mirror of https://github.com/friendica/friendica
52 lines
1.2 KiB
PHP
52 lines
1.2 KiB
PHP
<?php
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/**
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* Validates a color according to the HTML spec.
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*/
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class HTMLPurifier_AttrDef_HTML_Color extends HTMLPurifier_AttrDef
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{
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/**
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* @param string $string
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* @param HTMLPurifier_Config $config
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* @param HTMLPurifier_Context $context
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* @return bool|string
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*/
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public function validate($string, $config, $context)
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{
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static $colors = null;
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if ($colors === null) {
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$colors = $config->get('Core.ColorKeywords');
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}
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$string = trim($string);
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if (empty($string)) {
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return false;
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}
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$lower = strtolower($string);
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if (isset($colors[$lower])) {
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return $colors[$lower];
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}
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if ($string[0] === '#') {
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$hex = substr($string, 1);
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} else {
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$hex = $string;
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}
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$length = strlen($hex);
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if ($length !== 3 && $length !== 6) {
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return false;
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}
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if (!ctype_xdigit($hex)) {
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return false;
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}
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if ($length === 3) {
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$hex = $hex[0] . $hex[0] . $hex[1] . $hex[1] . $hex[2] . $hex[2];
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}
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return "#$hex";
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}
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}
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// vim: et sw=4 sts=4
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