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<?php namespace Aws\Credentials; use Aws\Exception\CredentialsException; use GuzzleHttp\Psr7\Request; use GuzzleHttp\Promise\PromiseInterface; use Psr\Http\Message\ResponseInterface; /** * Credential provider that fetches credentials with GET request. * ECS environment variable is used in constructing request URI. */ class EcsCredentialProvider { const SERVER_URI = 'http://169.254.170.2'; const ENV_URI = "AWS_CONTAINER_CREDENTIALS_RELATIVE_URI"; /** @var callable */ private $client; /** * The constructor accepts following options: * - timeout: (optional) Connection timeout, in seconds, default 1.0 * - client: An EcsClient to make request from * * @param array $config Configuration options */ public function __construct(array $config = []) { $this->timeout = isset($config['timeout']) ? $config['timeout'] : 1.0; $this->client = isset($config['client']) ? $config['client'] : \Aws\default_http_handler(); } /** * Load ECS credentials * * @return PromiseInterface */ public function __invoke() { $client = $this->client; $request = new Request('GET', self::getEcsUri()); return $client( $request, [ 'timeout' => $this->timeout, 'proxy' => '', ] )->then(function (ResponseInterface $response) { $result = $this->decodeResult((string) $response->getBody()); return new Credentials( $result['AccessKeyId'], $result['SecretAccessKey'], $result['Token'], strtotime($result['Expiration']) ); })->otherwise(function ($reason) { $reason = is_array($reason) ? $reason['exception'] : $reason; $msg = $reason->getMessage(); throw new CredentialsException( "Error retrieving credential from ECS ($msg)" ); }); } /** * Fetch credential URI from ECS environment variable * * @return string Returns ECS URI */ private function getEcsUri() { $creds_uri = getenv(self::ENV_URI); return self::SERVER_URI . $creds_uri; } private function decodeResult($response) { $result = json_decode($response, true); if (!isset($result['AccessKeyId'])) { throw new CredentialsException('Unexpected ECS credential value'); } return $result; } }
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