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<?php |
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declare(strict_types = 1); |
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namespace Sop\X501\StringPrep; |
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use Sop\ASN1\Element; |
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use Sop\ASN1\Type\Primitive\T61String; |
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/** |
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* Implements 'Transcode' step of the Internationalized String Preparation |
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* as specified by RFC 4518. |
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* |
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* @see https://tools.ietf.org/html/rfc4518#section-2.1 |
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*/ |
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class TranscodeStep implements PrepareStep |
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{ |
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/** |
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* Supported ASN.1 types. |
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* |
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* @var array |
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*/ |
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const SUPPORTED_TYPES = [ |
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Element::TYPE_UTF8_STRING, |
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Element::TYPE_PRINTABLE_STRING, |
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Element::TYPE_BMP_STRING, |
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Element::TYPE_UNIVERSAL_STRING, |
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Element::TYPE_T61_STRING, |
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]; |
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/** |
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* ASN.1 type of the string. |
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* |
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* @var int |
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*/ |
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protected $_type; |
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/** |
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* Constructor. |
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* |
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* @param int $type ASN.1 type tag of the string |
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*/ |
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public function __construct(int $type) |
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{ |
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$this->_type = $type; |
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} |
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/** |
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* Check whether transcoding from given ASN.1 type tag is supported. |
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* |
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* @param int $type ASN.1 type tag |
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* |
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* @return bool |
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*/ |
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public static function isTypeSupported(int $type): bool |
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{ |
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return in_array($type, self::SUPPORTED_TYPES); |
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} |
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/** |
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* @param string $string String to prepare |
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* |
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* @throws \LogicException If string type is not supported |
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* |
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* @return string UTF-8 encoded string |
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*/ |
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public function apply(string $string): string |
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{ |
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switch ($this->_type) { |
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// UTF-8 string as is |
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case Element::TYPE_UTF8_STRING: |
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return $string; |
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// PrintableString maps directly to UTF-8 |
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case Element::TYPE_PRINTABLE_STRING: |
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return $string; |
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// UCS-2 to UTF-8 |
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case Element::TYPE_BMP_STRING: |
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1 |
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return mb_convert_encoding($string, 'UTF-8', 'UCS-2BE'); |
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// UCS-4 to UTF-8 |
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case Element::TYPE_UNIVERSAL_STRING: |
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1 |
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return mb_convert_encoding($string, 'UTF-8', 'UCS-4BE'); |
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// TeletexString mapping is a local matter. |
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// We take a shortcut here and encode it as a hexstring. |
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case Element::TYPE_T61_STRING: |
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$el = new T61String($string); |
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return '#' . bin2hex($el->toDER()); |
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} |
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throw new \LogicException(sprintf('Unsupported string type %s.', |
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1 |
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Element::tagToName($this->_type))); |
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} |
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} |
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sop /
x501
