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<?php
declare(strict_types=1);
namespace AsyncAws\Core;
use AsyncAws\Core\AwsError\AwsErrorFactoryInterface;
use AsyncAws\Core\AwsError\ChainAwsErrorFactory;
use AsyncAws\Core\Credentials\CacheProvider;
use AsyncAws\Core\Credentials\ChainProvider;
use AsyncAws\Core\Credentials\CredentialProvider;
use AsyncAws\Core\EndpointDiscovery\EndpointCache;
use AsyncAws\Core\Exception\InvalidArgument;
use AsyncAws\Core\Exception\LogicException;
use AsyncAws\Core\Exception\RuntimeException;
use AsyncAws\Core\HttpClient\AwsRetryStrategy;
use AsyncAws\Core\Signer\Signer;
use AsyncAws\Core\Signer\SignerV4;
use AsyncAws\Core\Stream\StringStream;
use Psr\Log\LoggerInterface;
use Psr\Log\NullLogger;
use Symfony\Component\HttpClient\HttpClient;
use Symfony\Component\HttpClient\RetryableHttpClient;
use Symfony\Contracts\HttpClient\HttpClientInterface;
/**
* Base class all API clients are inheriting.
*
* @author Tobias Nyholm <tobias.nyholm@gmail.com>
* @author Jérémy Derussé <jeremy@derusse.com>
*/
abstract class AbstractApi
{
/**
* @var HttpClientInterface
*/
private $httpClient;
/**
* @var Configuration
*/
private $configuration;
/**
* @var CredentialProvider
*/
private $credentialProvider;
/**
* @var Signer[]
*/
private $signers;
/**
* @var LoggerInterface
*/
private $logger;
/**
* @var AwsErrorFactoryInterface
*/
private $awsErrorFactory;
/**
* @var EndpointCache
*/
private $endpointCache;
/**
* @param Configuration|array $configuration
*/
public function __construct($configuration = [], ?CredentialProvider $credentialProvider = null, ?HttpClientInterface $httpClient = null, ?LoggerInterface $logger = null)
{
if (\is_array($configuration)) {
$configuration = Configuration::create($configuration);
} elseif (!$configuration instanceof Configuration) {
throw new InvalidArgument(sprintf('First argument to "%s::__construct()" must be an array or an instance of "%s"', static::class, Configuration::class));
}
$this->logger = $logger ?? new NullLogger();
$this->awsErrorFactory = $this->getAwsErrorFactory();
$this->endpointCache = new EndpointCache();
if (!isset($httpClient)) {
$httpClient = HttpClient::create();
if (class_exists(RetryableHttpClient::class)) {
/** @psalm-suppress MissingDependency */
$httpClient = new RetryableHttpClient(
$httpClient,
new AwsRetryStrategy(AwsRetryStrategy::DEFAULT_RETRY_STATUS_CODES, 1000, 2.0, 0, 0.1, $this->awsErrorFactory),
3,
$this->logger
);
}
}
$this->httpClient = $httpClient;
$this->configuration = $configuration;
$this->credentialProvider = $credentialProvider ?? new CacheProvider(ChainProvider::createDefaultChain($this->httpClient, $this->logger));
}
final public function getConfiguration(): Configuration
{
return $this->configuration;
}
final public function presign(Input $input, ?\DateTimeImmutable $expires = null): string
{
$request = $input->request();
$request->setEndpoint($this->getEndpoint($request->getUri(), $request->getQuery(), $input->getRegion()));
if (null !== $credentials = $this->credentialProvider->getCredentials($this->configuration)) {
$this->getSigner($input->getRegion())->presign($request, $credentials, new RequestContext(['expirationDate' => $expires]));
}
return $request->getEndpoint();
}
/**
* @deprecated
*/
protected function getServiceCode(): string
{
throw new LogicException(sprintf('The method "%s" should not be called. The Client "%s" must implement the "%s" method.', __FUNCTION__, \get_class($this), 'getEndpointMetadata'));
}
/**
* @deprecated
*/
protected function getSignatureVersion(): string
{
throw new LogicException(sprintf('The method "%s" should not be called. The Client "%s" must implement the "%s" method.', __FUNCTION__, \get_class($this), 'getEndpointMetadata'));
}
/**
* @deprecated
*/
protected function getSignatureScopeName(): string
{
throw new LogicException(sprintf('The method "%s" should not be called. The Client "%s" must implement the "%s" method.', __FUNCTION__, \get_class($this), 'getEndpointMetadata'));
}
final protected function getResponse(Request $request, ?RequestContext $context = null): Response
{
$request->setEndpoint($this->getDiscoveredEndpoint($request->getUri(), $request->getQuery(), $context ? $context->getRegion() : null, $context ? $context->usesEndpointDiscovery() : false, $context ? $context->requiresEndpointDiscovery() : false));
if (null !== $credentials = $this->credentialProvider->getCredentials($this->configuration)) {
$this->getSigner($context ? $context->getRegion() : null)->sign($request, $credentials, $context ?? new RequestContext());
}
$length = $request->getBody()->length();
if (null !== $length && !$request->hasHeader('content-length')) {
$request->setHeader('content-length', (string) $length);
}
// Some servers (like testing Docker Images) does not supports `Transfer-Encoding: chunked` requests.
// The body is converted into string to prevent curl using `Transfer-Encoding: chunked` unless it really has to.
if (($requestBody = $request->getBody()) instanceof StringStream) {
$requestBody = $requestBody->stringify();
}
$response = $this->httpClient->request(
$request->getMethod(),
$request->getEndpoint(),
[
'headers' => $request->getHeaders(),
] + (0 === $length ? [] : ['body' => $requestBody])
);
if ($debug = filter_var($this->configuration->get('debug'), \FILTER_VALIDATE_BOOLEAN)) {
$this->logger->debug('AsyncAws HTTP request sent: {method} {endpoint}', [
'method' => $request->getMethod(),
'endpoint' => $request->getEndpoint(),
'headers' => json_encode($request->getHeaders()),
'body' => 0 === $length ? null : $requestBody,
]);
}
return new Response($response, $this->httpClient, $this->logger, $this->awsErrorFactory, $this->endpointCache, $request, $debug, $context ? $context->getExceptionMapping() : []);
}
/**
* @return callable[]
*/
protected function getSignerFactories(): array
{
return [
'v4' => static function (string $service, string $region) {
return new SignerV4($service, $region);
},
];
}
protected function getAwsErrorFactory(): AwsErrorFactoryInterface
{
return new ChainAwsErrorFactory();
}
/**
* Returns the AWS endpoint metadata for the given region.
* When user did not provide a region, the client have to either return a global endpoint or fallback to
* the Configuration::DEFAULT_REGION constant.
*
* This implementation is a BC layer for client that does not require core:^1.2.
*
* @param ?string $region region provided by the user (without fallback to a default region)
*
* @return array{endpoint: string, signRegion: string, signService: string, signVersions: string[]}
*/
protected function getEndpointMetadata(?string $region): array
{
/** @psalm-suppress TooManyArguments */
trigger_deprecation('async-aws/core', '1.2', 'Extending "%s"" without overriding "%s" is deprecated. This method will be abstract in version 2.0.', __CLASS__, __FUNCTION__);
/** @var string $endpoint */
$endpoint = $this->configuration->get('endpoint');
/** @var string $region */
$region = $region ?? $this->configuration->get('region');
return [
'endpoint' => strtr($endpoint, [
'%region%' => $region,
'%service%' => $this->getServiceCode(),
]),
'signRegion' => $region,
'signService' => $this->getSignatureScopeName(),
'signVersions' => [$this->getSignatureVersion()],
];
}
/**
* Build the endpoint full uri.
*
* @param string $uri or path
* @param array $query parameters that should go in the query string
* @param ?string $region region provided by the user in the `@region` parameter of the Input
*/
protected function getEndpoint(string $uri, array $query, ?string $region): string
{
/** @var string $region */
$region = $region ?? ($this->configuration->isDefault('region') ? null : $this->configuration->get('region'));
if (!$this->configuration->isDefault('endpoint')) {
/** @var string $endpoint */
$endpoint = $this->configuration->get('endpoint');
} else {
$metadata = $this->getEndpointMetadata($region);
$endpoint = $metadata['endpoint'];
}
if (false !== strpos($endpoint, '%region%') || false !== strpos($endpoint, '%service%')) {
/** @psalm-suppress TooManyArguments */
trigger_deprecation('async-aws/core', '1.2', 'providing an endpoint with placeholder is deprecated and will be ignored in version 2.0. Provide full endpoint instead.');
$endpoint = strtr($endpoint, [
'%region%' => $region ?? $this->configuration->get('region'),
'%service%' => $this->getServiceCode(), // if people provides a custom endpoint 'http://%service%.localhost/
]);
}
$endpoint .= $uri;
if (empty($query)) {
return $endpoint;
}
return $endpoint . (false === strpos($endpoint, '?') ? '?' : '&') . http_build_query($query);
}
protected function discoverEndpoints(?string $region): array
{
throw new LogicException(sprintf('The Client "%s" must implement the "%s" method.', \get_class($this), 'discoverEndpoints'));
}
private function getDiscoveredEndpoint(string $uri, array $query, ?string $region, bool $usesEndpointDiscovery, bool $requiresEndpointDiscovery)
{
if (!$this->configuration->isDefault('endpoint')) {
return $this->getEndpoint($uri, $query, $region);
}
$usesEndpointDiscovery = $requiresEndpointDiscovery || ($usesEndpointDiscovery && filter_var($this->configuration->get(Configuration::OPTION_ENDPOINT_DISCOVERY_ENABLED), \FILTER_VALIDATE_BOOLEAN));
if (!$usesEndpointDiscovery) {
return $this->getEndpoint($uri, $query, $region);
}
// 1. use an active endpoints
if (null === $endpoint = $this->endpointCache->getActiveEndpoint($region)) {
$previous = null;
try {
// 2. call API to fetch new endpoints
$endpoints = $this->discoverEndpoints($region);
$this->endpointCache->addEndpoints($region, $endpoints);
// 3. use active endpoints that has just been injected
$endpoint = $this->endpointCache->getActiveEndpoint($region);
} catch (\Exception $previous) {
}
// 4. if endpoint is still null, fallback to expired endpoint
if (null === $endpoint && null === $endpoint = $this->endpointCache->getExpiredEndpoint($region)) {
if ($requiresEndpointDiscovery) {
throw new RuntimeException(sprintf('The Client "%s" failed to fetch the endpoint.', \get_class($this)), 0, $previous);
}
return $this->getEndpoint($uri, $query, $region);
}
}
return $endpoint;
}
/**
* @param ?string $region region provided by the user in the `@region` parameter of the Input
*/
private function getSigner(?string $region)
{
/** @var string $region */
$region = $region ?? ($this->configuration->isDefault('region') ? null : $this->configuration->get('region'));
if (!isset($this->signers[$region])) {
$factories = $this->getSignerFactories();
$factory = null;
if ($this->configuration->isDefault('endpoint') || $this->configuration->isDefault('region')) {
$metadata = $this->getEndpointMetadata($region);
} else {
// Allow non-aws region with custom endpoint
$metadata = $this->getEndpointMetadata(Configuration::DEFAULT_REGION);
$metadata['signRegion'] = $region;
}
foreach ($metadata['signVersions'] as $signatureVersion) {
if (isset($factories[$signatureVersion])) {
$factory = $factories[$signatureVersion];
break;
}
}
if (null === $factory) {
throw new InvalidArgument(sprintf('None of the signatures "%s" is implemented.', implode(', ', $metadata['signVersions'])));
}
$this->signers[$region] = $factory($metadata['signService'], $metadata['signRegion']);
}
/** @psalm-suppress PossiblyNullArrayOffset */
return $this->signers[$region];
}
}
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