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<?php |
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declare(strict_types=1); |
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namespace TMV\OpenIdClient\AuthMethod; |
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use Jose\Component\Signature\JWSBuilder; |
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use Jose\Component\Signature\Serializer\Serializer; |
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use TMV\OpenIdClient\ClientInterface as OpenIDClient; |
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use TMV\OpenIdClient\Exception\RuntimeException; |
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final class PrivateKeyJwt extends AbstractJwtAuth |
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{ |
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/** @var JWSBuilder */ |
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private $jwsBuilder; |
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/** @var Serializer */ |
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private $jwsSerializer; |
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/** @var null|string */ |
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private $kid; |
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/** @var int */ |
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private $tokenTTL; |
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/** |
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* PrivateKeyJwt constructor. |
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* |
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* @param JWSBuilder $jwsBuilder |
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* @param Serializer $serializer |
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* @param string|null $kid |
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* @param int $tokenTTL |
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*/ |
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public function __construct( |
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JWSBuilder $jwsBuilder, |
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Serializer $serializer, |
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?string $kid = null, |
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int $tokenTTL = 60 |
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) { |
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$this->jwsBuilder = $jwsBuilder; |
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$this->jwsSerializer = $serializer; |
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$this->kid = $kid; |
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$this->tokenTTL = $tokenTTL; |
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} |
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public function getSupportedMethod(): string |
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{ |
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return 'private_key_jwt'; |
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} |
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protected function createAuthJwt(OpenIDClient $client, array $claims = []): string |
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{ |
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$issuer = $client->getIssuer(); |
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$issuerMetadata = $issuer->getMetadata(); |
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$clientId = $client->getMetadata()->getClientId(); |
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$jwk = $client->getJWKS()->selectKey('sig', null, $this->kid ? ['kid' => $this->kid] : []); |
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if (! $jwk) { |
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throw new RuntimeException('Unable to get a client signature jwk'); |
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} |
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$time = \time(); |
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$jti = \bin2hex(\random_bytes(32)); |
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/** @var string $payload */ |
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$payload = \json_encode(\array_merge( |
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$claims, |
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[ |
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'iss' => $clientId, |
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'sub' => $clientId, |
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'aud' => $issuerMetadata->getIssuer(), |
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'iat' => $time, |
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'exp' => $time + $this->tokenTTL, |
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'jti' => $jti, |
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] |
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)); |
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$jws = $this->jwsBuilder->create() |
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->withPayload($payload) |
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->addSignature($jwk, ['alg' => $jwk->get('alg'), 'jti' => $jti]) |
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->build(); |
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return $this->jwsSerializer->serialize($jws, 0); |
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} |
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} |
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thomasvargiu /
php-openid-client
