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<?php declare(strict_types=1); namespace AsyncAws\Core\Credentials; use AsyncAws\Core\Configuration; use Psr\Log\LoggerInterface; use Psr\Log\NullLogger; use Symfony\Component\HttpClient\Exception\JsonException; use Symfony\Component\HttpClient\Exception\TransportException; use Symfony\Component\HttpClient\HttpClient; use Symfony\Contracts\HttpClient\Exception\DecodingExceptionInterface; use Symfony\Contracts\HttpClient\Exception\HttpExceptionInterface; use Symfony\Contracts\HttpClient\Exception\TransportExceptionInterface; use Symfony\Contracts\HttpClient\HttpClientInterface; use Symfony\Contracts\HttpClient\ResponseInterface; /** * Provides Credentials from the running EC2 metadata server using the IMDSv1 and IMDSv2. * * @see https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instancedata-data-retrieval.html * * @author Jérémy Derussé <jeremy@derusse.com> */ final class InstanceProvider implements CredentialProvider { private const TOKEN_ENDPOINT = 'http://169.254.169.254/latest/api/token'; private const METADATA_ENDPOINT = 'http://169.254.169.254/latest/meta-data/iam/security-credentials'; /** * @var LoggerInterface */ private $logger; /** * @var HttpClientInterface */ private $httpClient; /** * @var float */ private $timeout; /** * @var int */ private $tokenTtl; public function __construct(?HttpClientInterface $httpClient = null, ?LoggerInterface $logger = null, float $timeout = 1.0, int $tokenTtl = 21600) { $this->logger = $logger ?? new NullLogger(); $this->httpClient = $httpClient ?? HttpClient::create(); $this->timeout = $timeout; $this->tokenTtl = $tokenTtl; } public function getCredentials(Configuration $configuration): ?Credentials { $token = $this->getToken(); $headers = []; if (null !== $token) { $headers = ['X-aws-ec2-metadata-token' => $token]; } try { // Fetch current Profile $response = $this->httpClient->request('GET', self::METADATA_ENDPOINT, [ 'timeout' => $this->timeout, 'headers' => $headers, ]); $profile = $response->getContent(); // Fetch credentials from profile $response = $this->httpClient->request('GET', self::METADATA_ENDPOINT . '/' . $profile, [ 'timeout' => $this->timeout, 'headers' => $headers, ]); $result = $this->toArray($response); if ('Success' !== $result['Code']) { $this->logger->info('Unexpected instance profile.', ['response_code' => $result['Code']]); return null; } } catch (DecodingExceptionInterface $e) { $this->logger->info('Failed to decode Credentials.', ['exception' => $e]); return null; } catch (TransportExceptionInterface|HttpExceptionInterface $e) { $this->logger->info('Failed to fetch Profile from Instance Metadata.', ['exception' => $e]); return null; } if (null !== $date = $response->getHeaders(false)['date'][0] ?? null) { $date = new \DateTimeImmutable($date); } return new Credentials( $result['AccessKeyId'], $result['SecretAccessKey'], $result['Token'], Credentials::adjustExpireDate(new \DateTimeImmutable($result['Expiration']), $date) ); } /** * Copy of Symfony\Component\HttpClient\Response::toArray without assertion on Content-Type header. * * @return array<string, mixed> */ private function toArray(ResponseInterface $response): array { if ('' === $content = $response->getContent(true)) { throw new TransportException('Response body is empty.'); } try { $content = json_decode($content, true, 512, \JSON_BIGINT_AS_STRING | (\PHP_VERSION_ID >= 70300 ? \JSON_THROW_ON_ERROR : 0)); } catch (\JsonException $e) { /** @psalm-suppress all */ throw new JsonException(\sprintf('%s for "%s".', $e->getMessage(), $response->getInfo('url')), $e->getCode()); } if (\PHP_VERSION_ID < 70300 && \JSON_ERROR_NONE !== json_last_error()) { /** @psalm-suppress InvalidArgument */ throw new JsonException(\sprintf('%s for "%s".', json_last_error_msg(), $response->getInfo('url')), json_last_error()); } if (!\is_array($content)) { /** @psalm-suppress InvalidArgument */ throw new JsonException(\sprintf('JSON content was expected to decode to an array, %s returned for "%s".', \gettype($content), $response->getInfo('url'))); } return $content; } private function getToken(): ?string { try { $response = $this->httpClient->request('PUT', self::TOKEN_ENDPOINT, [ 'timeout' => $this->timeout, 'headers' => ['X-aws-ec2-metadata-token-ttl-seconds' => $this->tokenTtl], ] ); return $response->getContent(); } catch (TransportExceptionInterface|HttpExceptionInterface $e) { $this->logger->info('Failed to fetch metadata token for IMDSv2, fallback to IMDSv1.', ['exception' => $e]); return null; } } }
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