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<?php namespace Aws\Credentials; use Aws\Exception\CredentialsException; use Aws\Exception\InvalidJsonException; use Aws\Sdk; use GuzzleHttp\Promise; use GuzzleHttp\Exception\RequestException; use GuzzleHttp\Psr7\Request; use GuzzleHttp\Promise\PromiseInterface; use Psr\Http\Message\ResponseInterface; /** * Credential provider that provides credentials from the EC2 metadata server. */ class InstanceProfileProvider { const SERVER_URI = 'http://169.254.169.254/latest/'; const CRED_PATH = 'meta-data/iam/security-credentials/'; const ENV_DISABLE = 'AWS_EC2_METADATA_DISABLED'; /** @var string */ private $profile; /** @var callable */ private $client; /** @var int */ private $retries; /** @var int */ private $attempts; /** @var float|mixed */ private $timeout; /** * The constructor accepts the following options: * * - timeout: Connection timeout, in seconds. * - profile: Optional EC2 profile name, if known. * - retries: Optional number of retries to be attempted. * * @param array $config Configuration options. */ public function __construct(array $config = []) { $this->timeout = isset($config['timeout']) ? $config['timeout'] : 1.0; $this->profile = isset($config['profile']) ? $config['profile'] : null; $this->retries = isset($config['retries']) ? $config['retries'] : 3; $this->attempts = 0; $this->client = isset($config['client']) ? $config['client'] // internal use only : \Aws\default_http_handler(); } /** * Loads instance profile credentials. * * @return PromiseInterface */ public function __invoke() { return Promise\coroutine(function () { if (!$this->profile) { $this->profile = (yield $this->request(self::CRED_PATH)); } $result = null; while ($result == null) { try { $json = (yield $this->request(self::CRED_PATH . $this->profile)); $result = $this->decodeResult($json); } catch (InvalidJsonException $e) { if ($this->attempts < $this->retries) { sleep(pow(1.2, $this->attempts)); } else { throw new CredentialsException( 'Invalid JSON Response, retries exhausted.' ); } } catch (RequestException $e) { if ($this->attempts < $this->retries) { sleep(pow(1.2, $this->attempts)); } else { throw new CredentialsException( 'Networking error, retries exhausted.' ); } } $this->attempts++; } yield new Credentials( $result['AccessKeyId'], $result['SecretAccessKey'], $result['Token'], strtotime($result['Expiration']) ); }); } /** * @param string $url * @return PromiseInterface Returns a promise that is fulfilled with the * body of the response as a string. */ private function request($url) { $disabled = getenv(self::ENV_DISABLE) ?: false; if (strcasecmp($disabled, 'true') === 0) { throw new CredentialsException( $this->createErrorMessage('EC2 metadata server access disabled') ); } $fn = $this->client; $request = new Request('GET', self::SERVER_URI . $url); $userAgent = 'aws-sdk-php/' . Sdk::VERSION; if (defined('HHVM_VERSION')) { $userAgent .= ' HHVM/' . HHVM_VERSION; } $userAgent .= ' ' . \Aws\default_user_agent(); $request = $request->withHeader('User-Agent', $userAgent); return $fn($request, ['timeout' => $this->timeout]) ->then(function (ResponseInterface $response) { return (string) $response->getBody(); })->otherwise(function (array $reason) { $reason = $reason['exception']; if ($reason instanceof \GuzzleHttp\Exception\RequestException) { throw $reason; } $msg = $reason->getMessage(); throw new CredentialsException( $this->createErrorMessage($msg) ); }); } private function createErrorMessage($previous) { return "Error retrieving credentials from the instance profile " . "metadata server. ({$previous})"; } private function decodeResult($response) { $result = json_decode($response, true); if (json_last_error() > 0) { throw new InvalidJsonException(); } if ($result['Code'] !== 'Success') { throw new CredentialsException('Unexpected instance profile ' . 'response code: ' . $result['Code']); } return $result; } }
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