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htmlpurifier/library/HTMLPurifier/AttrDef/CSS/FontFamily.php

62 lines
1.8 KiB
PHP

<?php
require_once 'HTMLPurifier/AttrDef.php';
// whitelisting allowed fonts would be nice
/**
* Validates a font family list according to CSS spec
*/
class HTMLPurifier_AttrDef_CSS_FontFamily extends HTMLPurifier_AttrDef
{
function validate($string, $config, &$context) {
static $generic_names = array(
'serif' => true,
'sans-serif' => true,
'monospace' => true,
'fantasy' => true,
'cursive' => true
);
$string = $this->parseCDATA($string);
// assume that no font names contain commas in them
$fonts = explode(',', $string);
$final = '';
foreach($fonts as $font) {
$font = trim($font);
if ($font === '') continue;
// match a generic name
if (isset($generic_names[$font])) {
$final .= $font . ', ';
continue;
}
// match a quoted name
if ($font[0] === '"' || $font[0] === "'") {
$length = strlen($font);
if ($length <= 2) continue;
$quote = $font[0];
if ($font[$length - 1] !== $quote) continue;
$font = substr($font, 1, $length - 2);
}
// process font
if (ctype_alnum($font)) {
// very simple font, allow it in unharmed
$final .= $font . ', ';
continue;
}
$nospace = str_replace(array(' ', '.', '!'), '', $font);
if (ctype_alnum($nospace)) {
// font with spaces in it
$final .= "'$font', ";
continue;
}
}
$final = rtrim($final, ', ');
if ($final === '') return false;
return $final;
}
}