JWX\JWE\CompressionAlgorithm\DeflateAlgorithm

Complexity

Total Complexity

13

Size/Duplication

Total Lines	72
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	1

Test Coverage

Coverage

100%

Importance

Changes	1
Bugs	0	Features	0

5 Methods

Rating	Name	Duplication	Size	Complexity
A	headerParameters()	0	3	1
A	__construct()	0	6	3
A	compress()	0	9	4
A	decompress()	0	9	4
A	compressionParamValue()	0	3	1

<?php

declare(strict_types = 1);

namespace Sop\JWX\JWE\CompressionAlgorithm;

use Sop\JWX\JWA\JWA;
use Sop\JWX\JWE\CompressionAlgorithm;
use Sop\JWX\JWT\Parameter\CompressionAlgorithmParameter;

/**
 * Implements DEFLATE compression algorithm.
 *
 * @see https://tools.ietf.org/html/rfc7516#section-4.1.3
 * @see https://tools.ietf.org/html/rfc1951
 */
class DeflateAlgorithm implements CompressionAlgorithm
{
    /**
     * Compression level.
     *
     * @var int
     */
    protected $_compressionLevel;

    /**
     * Constructor.
     *
     * @param int $level Compression level 0..9
     */
    public function __construct(int $level = -1)
    {
        if ($level < -1 || $level > 9) {
            throw new \DomainException('Compression level must be -1..9.');
        }
        $this->_compressionLevel = $level;
    }

    /**
     * {@inheritdoc}
     *
     * @throws \RuntimeException
     */
    public function compress(string $data): string
    {
        $ret = @gzdeflate($data, $this->_compressionLevel);
        if (false === $ret) {
            $err = error_get_last();
            $msg = isset($err) && __FILE__ === $err['file'] ? $err['message'] : null;
            throw new \RuntimeException($msg ?? 'gzdeflate() failed.');
        }
        return $ret;
    }

    /**
     * {@inheritdoc}
     *
     * @throws \RuntimeException
     */
    public function decompress(string $data): string
    {
        $ret = @gzinflate($data);
        if (false === $ret) {
            $err = error_get_last();
            $msg = isset($err) && __FILE__ === $err['file'] ? $err['message'] : null;
            throw new \RuntimeException($msg ?? 'gzinflate() failed.');
        }
        return $ret;
    }

    /**
     * {@inheritdoc}
     */
    public function compressionParamValue(): string
    {
        return JWA::ALGO_DEFLATE;
    }

    /**
     * {@inheritdoc}
     */
    public function headerParameters(): array
    {
        return [CompressionAlgorithmParameter::fromAlgorithm($this)];
    }
}