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<?php |
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declare(strict_types=1); |
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namespace TMV\OpenIdClient\Token; |
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use Jose\Component\Core\AlgorithmManager; |
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use Jose\Component\Core\JWKSet; |
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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\JWEDecrypter; |
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use Jose\Component\Encryption\JWELoader; |
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use Jose\Component\Encryption\Serializer\CompactSerializer; |
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use Jose\Component\Encryption\Serializer\JWESerializerManager; |
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use function TMV\OpenIdClient\base64url_decode; |
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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 TokenDecrypter implements TokenDecrypterInterface |
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{ |
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/** @var AlgorithmManager */ |
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private $algorithmManager; |
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/** |
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* TokenDecrypter constructor. |
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* |
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* @param AlgorithmManager $algorithmManager |
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*/ |
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public function __construct(?AlgorithmManager $algorithmManager = null) |
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{ |
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$this->algorithmManager = $algorithmManager ?: new AlgorithmManager([]); |
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} |
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public function decryptToken(ClientInterface $client, string $token, string $use = 'id_token'): string |
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{ |
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$metadata = $client->getMetadata(); |
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$expectedAlg = $metadata->get($use . '_encrypted_response_alg'); |
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$expectedEnc = $metadata->get($use . '_encrypted_response_enc'); |
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if (! $expectedAlg) { |
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return $token; |
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} |
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$header = \json_decode(base64url_decode(\explode('.', $token)[0] ?? '{}'), true); |
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if ($expectedAlg !== ($header['alg'] ?? '')) { |
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throw new RuntimeException(\sprintf('Unexpected JWE alg received, expected %s, got: %s', $expectedAlg, $header['alg'] ?? '')); |
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} |
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if ($expectedEnc !== ($header['enc'] ?? '')) { |
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throw new RuntimeException(\sprintf('Unexpected JWE enc received, expected %s, got: %s', $expectedEnc, $header['enc'] ?? '')); |
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} |
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$serializer = new CompactSerializer(); |
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$jweLoader = new JWELoader( |
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new JWESerializerManager([$serializer]), |
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new JWEDecrypter($this->algorithmManager, $this->algorithmManager, new CompressionMethodManager([new Deflate()])), |
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null |
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); |
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if (\preg_match('/^(?:RSA|ECDH)/', $expectedAlg)) { |
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$jwks = $client->getJWKS(); |
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} else { |
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$jwk = jose_secret_key($metadata->getClientSecret() ?: '', $expectedAlg === 'dir' ? $expectedEnc : $expectedAlg); |
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$jwks = new JWKSet([$jwk]); |
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} |
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return $serializer->serialize($jweLoader->loadAndDecryptWithKeySet($token, $jwks, $recipient)); |
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} |
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} |
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thomasvargiu /
php-openid-client
