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<?php |
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declare(strict_types=1); |
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namespace TMV\OpenIdClient\RequestObject; |
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use Jose\Component\Core\AlgorithmManager; |
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use Jose\Component\Encryption\Compression\CompressionMethodManager; |
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use Jose\Component\Encryption\Compression\Deflate; |
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use Jose\Component\Encryption\JWEBuilder; |
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use Jose\Component\Encryption\Serializer\CompactSerializer as EncryptionCompactSerializer; |
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use Jose\Component\Encryption\Serializer\JWESerializer as JWESerializer; |
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use Jose\Component\Signature\Algorithm\None; |
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use Jose\Component\Signature\Algorithm\RS256; |
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use Jose\Component\Signature\JWSBuilder; |
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use Jose\Component\Signature\Serializer\CompactSerializer as SignatureCompactSerializer; |
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use Jose\Component\Signature\Serializer\Serializer as JWSSerializer; |
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use function TMV\OpenIdClient\base64url_encode; |
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use TMV\OpenIdClient\ClientInterface; |
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use TMV\OpenIdClient\Exception\RuntimeException; |
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use function TMV\OpenIdClient\jose_secret_key; |
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class RequestObjectFactory |
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{ |
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/** @var JWSBuilder */ |
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private $jwsBuilder; |
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/** @var JWEBuilder */ |
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private $jweBuilder; |
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/** @var JWSSerializer */ |
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private $signatureSerializer; |
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/** @var JWESerializer */ |
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private $encryptionSerializer; |
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public function __construct( |
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?AlgorithmManager $algorithmManager = null, |
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?JWSBuilder $jwsBuilder = null, |
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?JWEBuilder $jweBuilder = null, |
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?JWSSerializer $signatureSerializer = null, |
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?JWESerializer $encryptionSerializer = null |
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) { |
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$algorithmManager = $algorithmManager ?: new AlgorithmManager([new None(), new RS256()]); |
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$this->jwsBuilder = $jwsBuilder ?: new JWSBuilder($algorithmManager); |
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$this->jweBuilder = $jweBuilder ?: new JWEBuilder( |
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$algorithmManager, |
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$algorithmManager, |
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new CompressionMethodManager([new Deflate()]) |
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); |
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$this->signatureSerializer = $signatureSerializer ?: new SignatureCompactSerializer(); |
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$this->encryptionSerializer = $encryptionSerializer ?: new EncryptionCompactSerializer(); |
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} |
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public function create(ClientInterface $client, array $params = []): string |
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{ |
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$payload = $this->createPayload($client, $params); |
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$signedToken = $this->createSignedToken($client, $payload); |
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return $this->createEncryptedToken($client, $signedToken); |
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} |
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private function createPayload(ClientInterface $client, array $params = []): string |
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{ |
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$metadata = $client->getMetadata(); |
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$issuer = $client->getIssuer(); |
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$payload = \json_encode(\array_merge($params, [ |
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'iss' => $metadata->getClientId(), |
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'aud' => $issuer->getMetadata()->getIssuer(), |
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'client_id' => $metadata->getClientId(), |
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'jti' => \bin2hex(\random_bytes(32)), |
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'iat' => \time(), |
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'exp' => \time() + 300, |
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])); |
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if (! $payload) { |
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throw new RuntimeException('Unable to encode payload'); |
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} |
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return $payload; |
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} |
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private function createSignedToken(ClientInterface $client, string $payload): string |
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{ |
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$metadata = $client->getMetadata(); |
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/** @var string $alg */ |
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$alg = $metadata->get('request_object_signing_alg') ?: 'none'; |
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if ('none' === $alg) { |
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return \implode('.', [ |
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base64url_encode((string) \json_encode(['alg' => $alg])), |
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base64url_encode($payload), |
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'', |
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]); |
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} |
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if (0 === \strpos($alg, 'HS')) { |
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$jwk = jose_secret_key($metadata->getClientSecret() ?: ''); |
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} else { |
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$jwk = $client->getJWKS()->selectKey('sig', null, ['alg' => $alg]); |
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} |
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if (! $jwk) { |
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throw new RuntimeException('No key to sign with alg ' . $alg); |
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} |
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$header = \array_filter([ |
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'alg' => $alg, |
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'kid' => $jwk->has('kid') ? $jwk->get('kid') : null, |
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]); |
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$jws = $this->jwsBuilder->create() |
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->withPayload($payload) |
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->addSignature($jwk, $header) |
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->build(); |
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return $this->signatureSerializer->serialize($jws, 0); |
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} |
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private function createEncryptedToken(ClientInterface $client, string $payload): string |
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{ |
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$metadata = $client->getMetadata(); |
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$issuer = $client->getIssuer(); |
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/** @var null|string $alg */ |
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$alg = $metadata->get('request_object_encryption_alg'); |
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if (! $alg) { |
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return $payload; |
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} |
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/** @var null|string $enc */ |
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$enc = $metadata->get('request_object_encryption_enc'); |
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if (\preg_match('/^(RSA|ECDH)/', $alg)) { |
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$jwk = $issuer->getJwks()->selectKey('enc', null, ['alg' => $alg, 'enc' => $enc]); |
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} else { |
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$jwk = jose_secret_key( |
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$metadata->getClientSecret() ?: '', |
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'dir' === $alg ? $enc : $alg |
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); |
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} |
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if (! $jwk) { |
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throw new RuntimeException('No key to sign with alg ' . $alg); |
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} |
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$header = \array_filter([ |
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'alg' => $alg, |
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'enc' => $enc, |
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'kid' => $jwk->has('kid') ? $jwk->get('kid') : null, |
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]); |
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$jwe = $this->jweBuilder->create() |
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->withPayload($payload) |
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->withSharedProtectedHeader($header) |
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->addRecipient($jwk) |
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->build(); |
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return $this->encryptionSerializer->serialize($jwe, 0); |
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} |
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} |
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thomasvargiu /
php-openid-client
