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