Fresh\CentrifugoBundle\Service\Jwt\JwtGenerator

Complexity

Total Complexity

7

Size/Duplication

Total Lines	92
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	1

Importance

Changes

0

<?php
class JwtGenerator
{
    private const HMAC_ALGORITHM = 'sha256';

    private string $secret;

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Syntax error, unexpected T_STRING, expecting T_FUNCTION or T_CONST

    /**
     * @param string $centrifugoSecret
     */
    public function __construct(string $centrifugoSecret)
    {
        $this->secret = $centrifugoSecret;
    }

    /**
     * @param JwtPayloadInterface $payload
     *
     * @return string
     */
    public function generateToken(JwtPayloadInterface $payload): string
    {
        $headerPart = $this->buildHeaderPart();
        $payloadPart = $this->buildPayloadPart($payload);

        $headerPartEncoded = $this->base64EncodeUrlSafe($headerPart);
        $payloadPartEncoded = $this->base64EncodeUrlSafe($payloadPart);

        return \implode('.', [
            $headerPartEncoded,
            $payloadPartEncoded,
            $this->buildSignaturePart($headerPartEncoded, $payloadPartEncoded),
        ]);
    }

    /**
     * @return string
     */
    private function buildHeaderPart(): string
    {
        $header = [
            'typ' => 'JWT',
            'alg' => 'HS256',
        ];

        return $this->convertArrayToJsonString($header);
    }

    /**
     * @param JwtPayloadInterface $payload
     *
     * @return string
     */
    private function buildPayloadPart(JwtPayloadInterface $payload): string
    {
        return $this->convertArrayToJsonString($payload->getPayloadData());
    }

    /**
     * @param string $headerPartDecoded
     * @param string $payloadPartDecoded
     *
     * @return string
     */
    private function buildSignaturePart(string $headerPartDecoded, string $payloadPartDecoded): string
    {
        $data = $headerPartDecoded.'.'.$payloadPartDecoded;
        $hash = \hash_hmac(self::HMAC_ALGORITHM, $data, $this->secret, true);

        return $this->base64EncodeUrlSafe($hash);
    }

    /**
     * @param array $array
     *
     * @return string
     */
    private function convertArrayToJsonString(array $array): string
    {
        return \json_encode($array, \JSON_THROW_ON_ERROR);
    }

    /**
     * @param string $string
     *
     * @return string
     */
    private function base64EncodeUrlSafe(string $string): string
    {
        return \str_replace(['+', '/', '='], ['-', '_', ''], \base64_encode($string));
    }
}