mirror of https://github.com/friendica/friendica
79 lines
2.5 KiB
PHP
79 lines
2.5 KiB
PHP
<?php
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/**
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* Validates Color as defined by CSS.
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*/
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class HTMLPurifier_AttrDef_CSS_Color extends HTMLPurifier_AttrDef
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{
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public function validate($color, $config, $context) {
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static $colors = null;
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if ($colors === null) $colors = $config->get('Core.ColorKeywords');
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$color = trim($color);
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if ($color === '') return false;
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$lower = strtolower($color);
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if (isset($colors[$lower])) return $colors[$lower];
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if (strpos($color, 'rgb(') !== false) {
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// rgb literal handling
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$length = strlen($color);
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if (strpos($color, ')') !== $length - 1) return false;
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$triad = substr($color, 4, $length - 4 - 1);
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$parts = explode(',', $triad);
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if (count($parts) !== 3) return false;
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$type = false; // to ensure that they're all the same type
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$new_parts = array();
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foreach ($parts as $part) {
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$part = trim($part);
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if ($part === '') return false;
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$length = strlen($part);
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if ($part[$length - 1] === '%') {
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// handle percents
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if (!$type) {
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$type = 'percentage';
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} elseif ($type !== 'percentage') {
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return false;
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}
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$num = (float) substr($part, 0, $length - 1);
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if ($num < 0) $num = 0;
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if ($num > 100) $num = 100;
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$new_parts[] = "$num%";
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} else {
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// handle integers
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if (!$type) {
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$type = 'integer';
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} elseif ($type !== 'integer') {
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return false;
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}
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$num = (int) $part;
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if ($num < 0) $num = 0;
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if ($num > 255) $num = 255;
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$new_parts[] = (string) $num;
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}
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}
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$new_triad = implode(',', $new_parts);
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$color = "rgb($new_triad)";
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} else {
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// hexadecimal handling
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if ($color[0] === '#') {
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$hex = substr($color, 1);
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} else {
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$hex = $color;
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$color = '#' . $color;
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}
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$length = strlen($hex);
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if ($length !== 3 && $length !== 6) return false;
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if (!ctype_xdigit($hex)) return false;
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}
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return $color;
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}
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}
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// vim: et sw=4 sts=4
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