91 lines
3.1 KiB
PHP
91 lines
3.1 KiB
PHP
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<?php
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/**
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* Validates a font family list according to CSS spec
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* @todo whitelisting allowed fonts would be nice
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*/
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class HTMLPurifier_AttrDef_CSS_FontFamily extends HTMLPurifier_AttrDef
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{
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public function validate($string, $config, $context) {
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static $generic_names = array(
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'serif' => true,
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'sans-serif' => true,
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'monospace' => true,
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'fantasy' => true,
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'cursive' => true
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);
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// assume that no font names contain commas in them
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$fonts = explode(',', $string);
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$final = '';
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foreach($fonts as $font) {
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$font = trim($font);
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if ($font === '') continue;
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// match a generic name
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if (isset($generic_names[$font])) {
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$final .= $font . ', ';
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continue;
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}
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// match a quoted name
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if ($font[0] === '"' || $font[0] === "'") {
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$length = strlen($font);
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if ($length <= 2) continue;
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$quote = $font[0];
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if ($font[$length - 1] !== $quote) continue;
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$font = substr($font, 1, $length - 2);
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$new_font = '';
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for ($i = 0, $c = strlen($font); $i < $c; $i++) {
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if ($font[$i] === '\\') {
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$i++;
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if ($i >= $c) {
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$new_font .= '\\';
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break;
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}
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if (ctype_xdigit($font[$i])) {
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$code = $font[$i];
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for ($a = 1, $i++; $i < $c && $a < 6; $i++, $a++) {
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if (!ctype_xdigit($font[$i])) break;
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$code .= $font[$i];
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}
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// We have to be extremely careful when adding
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// new characters, to make sure we're not breaking
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// the encoding.
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$char = HTMLPurifier_Encoder::unichr(hexdec($code));
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if (HTMLPurifier_Encoder::cleanUTF8($char) === '') continue;
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$new_font .= $char;
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if ($i < $c && trim($font[$i]) !== '') $i--;
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continue;
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}
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if ($font[$i] === "\n") continue;
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}
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$new_font .= $font[$i];
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}
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$font = $new_font;
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}
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// $font is a pure representation of the font name
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if (ctype_alnum($font) && $font !== '') {
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// very simple font, allow it in unharmed
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$final .= $font . ', ';
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continue;
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}
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// complicated font, requires quoting
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// armor single quotes and new lines
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$font = str_replace("\\", "\\\\", $font);
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$font = str_replace("'", "\\'", $font);
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$final .= "'$font', ";
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}
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$final = rtrim($final, ', ');
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if ($final === '') return false;
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return $final;
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}
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}
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// vim: et sw=4 sts=4
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