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<?php |
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declare(strict_types = 1); |
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namespace Sop\JWX\JWE\CompressionAlgorithm; |
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use Sop\JWX\JWA\JWA; |
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use Sop\JWX\JWE\CompressionAlgorithm; |
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use Sop\JWX\JWT\Parameter\CompressionAlgorithmParameter; |
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/** |
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* Implements DEFLATE compression algorithm. |
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* |
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* @see https://tools.ietf.org/html/rfc7516#section-4.1.3 |
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* @see https://tools.ietf.org/html/rfc1951 |
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*/ |
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class DeflateAlgorithm implements CompressionAlgorithm |
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{ |
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/** |
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* Compression level. |
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* |
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* @var int |
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*/ |
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protected $_compressionLevel; |
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/** |
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* Constructor. |
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* |
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* @param int $level Compression level 0..9 |
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*/ |
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public function __construct(int $level = -1) |
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{ |
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if ($level < -1 || $level > 9) { |
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throw new \DomainException('Compression level must be -1..9.'); |
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} |
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$this->_compressionLevel = $level; |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @throws \RuntimeException |
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*/ |
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public function compress(string $data): string |
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{ |
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$ret = @gzdeflate($data, $this->_compressionLevel); |
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if (false === $ret) { |
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$err = error_get_last(); |
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$msg = isset($err) && __FILE__ === $err['file'] ? $err['message'] : null; |
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throw new \RuntimeException($msg ?? 'gzdeflate() failed.'); |
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} |
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return $ret; |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @throws \RuntimeException |
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*/ |
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public function decompress(string $data): string |
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{ |
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$ret = @gzinflate($data); |
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if (false === $ret) { |
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$err = error_get_last(); |
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$msg = isset($err) && __FILE__ === $err['file'] ? $err['message'] : null; |
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throw new \RuntimeException($msg ?? 'gzinflate() failed.'); |
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} |
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return $ret; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function compressionParamValue(): string |
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{ |
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return JWA::ALGO_DEFLATE; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function headerParameters(): array |
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{ |
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return [CompressionAlgorithmParameter::fromAlgorithm($this)]; |
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} |
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} |
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sop /
jwx
