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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";
const ENV_TIMEOUT = 'AWS_METADATA_SERVICE_TIMEOUT';
/** @var callable */
private $client;
/** @var float|mixed */
private $timeout;
/**
* 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 = [])
{
$timeout = getenv(self::ENV_TIMEOUT);
if (!$timeout) {
$timeout = isset($_SERVER[self::ENV_TIMEOUT])
? $_SERVER[self::ENV_TIMEOUT]
: (isset($config['timeout']) ? $config['timeout'] : 1.0);
}
$this->timeout = (float) $timeout;
$this->client = isset($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()
{
$credsUri = getenv(self::ENV_URI);
if ($credsUri === false) {
$credsUri = isset($_SERVER[self::ENV_URI]) ? $_SERVER[self::ENV_URI] : '';
}
return self::SERVER_URI . $credsUri;
}
private function decodeResult($response)
{
$result = json_decode($response, true);
if (!isset($result['AccessKeyId'])) {
throw new CredentialsException('Unexpected ECS credential value');
}
return $result;
}
}