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<?php |
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/* |
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* This file is part of the FreshCentrifugoBundle. |
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* |
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* (c) Artem Henvald <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace Fresh\CentrifugoBundle\Service\Jwt; |
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use Fresh\CentrifugoBundle\Token\JwtAlgorithm; |
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use Fresh\CentrifugoBundle\Token\JwtPayloadInterface; |
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/** |
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* JwtGenerator. |
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* |
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* @author Artem Henvald <[email protected]> |
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*/ |
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class JwtGenerator |
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{ |
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private const HMAC_ALGORITHM = 'sha256'; |
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/** @var string */ |
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private $secret; |
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/** @var string */ |
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private $centrifugoJwtAlgorithm; |
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/** |
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* @param string $centrifugoSecret |
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* @param string $centrifugoJwtAlgorithm |
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*/ |
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public function __construct(string $centrifugoSecret, string $centrifugoJwtAlgorithm) |
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{ |
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$this->secret = $centrifugoSecret; |
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JwtAlgorithm::assertValidAlgorithm($centrifugoJwtAlgorithm); |
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$this->centrifugoJwtAlgorithm = $centrifugoJwtAlgorithm; |
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} |
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/** |
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* @param JwtPayloadInterface $payload |
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* |
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* @return string |
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*/ |
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public function generateToken(JwtPayloadInterface $payload): string |
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{ |
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$headerPart = $this->buildHeaderPart(); |
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$payloadPart = $this->buildPayloadPart($payload); |
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$headerPartEncoded = $this->base64EncodeUrlSafe($headerPart); |
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$payloadPartEncoded = $this->base64EncodeUrlSafe($payloadPart); |
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return \implode('.', [ |
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$headerPartEncoded, |
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$payloadPartEncoded, |
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$this->buildSignaturePart($headerPartEncoded, $payloadPartEncoded), |
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]); |
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} |
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/** |
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* @return string |
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*/ |
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private function buildHeaderPart(): string |
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{ |
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$header = [ |
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'typ' => 'JWT', |
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'alg' => $this->centrifugoJwtAlgorithm, |
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]; |
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return $this->convertArrayToJsonString($header); |
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} |
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/** |
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* @param JwtPayloadInterface $payload |
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* |
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* @return string |
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*/ |
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private function buildPayloadPart(JwtPayloadInterface $payload): string |
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{ |
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return $this->convertArrayToJsonString($payload->getPayloadData()); |
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} |
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/** |
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* @param string $headerPartDecoded |
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* @param string $payloadPartDecoded |
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* |
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* @return string |
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*/ |
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private function buildSignaturePart(string $headerPartDecoded, string $payloadPartDecoded): string |
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{ |
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$data = $headerPartDecoded.'.'.$payloadPartDecoded; |
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$hash = \hash_hmac(self::HMAC_ALGORITHM, $data, $this->secret, true); |
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return $this->base64EncodeUrlSafe($hash); |
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} |
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/** |
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* @param array $array |
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* |
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* @return string |
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*/ |
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private function convertArrayToJsonString(array $array): string |
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{ |
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return \json_encode($array, \JSON_THROW_ON_ERROR); |
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} |
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/** |
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* @param string $string |
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* |
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* @return string |
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*/ |
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private function base64EncodeUrlSafe(string $string): string |
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{ |
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return \str_replace(['+', '/', '='], ['-', '_', ''], \base64_encode($string)); |
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} |
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} |
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fre5h /
CentrifugoBundle
