| 1: | <?php
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| 7: | class HTMLPurifier_AttrDef_Lang extends HTMLPurifier_AttrDef
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| 8: | {
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| 9: |
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| 16: | public function validate($string, $config, $context)
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| 17: | {
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| 18: | $string = trim($string);
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| 19: | if (!$string) {
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| 20: | return false;
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| 21: | }
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| 22: |
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| 23: | $subtags = explode('-', $string);
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| 24: | $num_subtags = count($subtags);
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| 25: |
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| 26: | if ($num_subtags == 0) {
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| 27: | return false;
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| 28: | }
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| 29: |
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| 30: |
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| 31: | $length = strlen($subtags[0]);
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| 32: | switch ($length) {
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| 33: | case 0:
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| 34: | return false;
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| 35: | case 1:
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| 36: | if (!($subtags[0] == 'x' || $subtags[0] == 'i')) {
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| 37: | return false;
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| 38: | }
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| 39: | break;
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| 40: | case 2:
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| 41: | case 3:
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| 42: | if (!ctype_alpha($subtags[0])) {
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| 43: | return false;
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| 44: | } elseif (!ctype_lower($subtags[0])) {
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| 45: | $subtags[0] = strtolower($subtags[0]);
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| 46: | }
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| 47: | break;
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| 48: | default:
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| 49: | return false;
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| 50: | }
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| 51: |
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| 52: | $new_string = $subtags[0];
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| 53: | if ($num_subtags == 1) {
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| 54: | return $new_string;
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| 55: | }
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| 56: |
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| 57: |
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| 58: | $length = strlen($subtags[1]);
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| 59: | if ($length == 0 || ($length == 1 && $subtags[1] != 'x') || $length > 8 || !ctype_alnum($subtags[1])) {
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| 60: | return $new_string;
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| 61: | }
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| 62: | if (!ctype_lower($subtags[1])) {
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| 63: | $subtags[1] = strtolower($subtags[1]);
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| 64: | }
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| 65: |
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| 66: | $new_string .= '-' . $subtags[1];
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| 67: | if ($num_subtags == 2) {
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| 68: | return $new_string;
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| 69: | }
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| 70: |
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| 71: |
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| 72: | for ($i = 2; $i < $num_subtags; $i++) {
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| 73: | $length = strlen($subtags[$i]);
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| 74: | if ($length == 0 || $length > 8 || !ctype_alnum($subtags[$i])) {
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| 75: | return $new_string;
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| 76: | }
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| 77: | if (!ctype_lower($subtags[$i])) {
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| 78: | $subtags[$i] = strtolower($subtags[$i]);
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| 79: | }
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| 80: | $new_string .= '-' . $subtags[$i];
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| 81: | }
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| 82: | return $new_string;
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| 83: | }
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| 84: | }
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| 87: | |