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<?php |
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namespace Dudlewebs\WPMCS\s3\Aws\Auth; |
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|
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use Dudlewebs\WPMCS\s3\Aws\Api\Service; |
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use Dudlewebs\WPMCS\s3\Aws\CommandInterface; |
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use Closure; |
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use Dudlewebs\WPMCS\s3\GuzzleHttp\Promise\Promise; |
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/** |
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* Handles auth scheme resolution. If a service models and auth scheme using |
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* the `auth` trait and the operation or metadata levels, this middleware will |
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* attempt to select the first compatible auth scheme it encounters and apply its |
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* signature version to the command's `@context` property bag. |
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* |
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* IMPORTANT: this middleware must be added to the "build" step. |
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* |
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* @internal |
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*/ |
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class AuthSelectionMiddleware |
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{ |
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/** @var callable */ |
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private $nextHandler; |
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/** @var AuthSchemeResolverInterface */ |
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private $authResolver; |
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/** @var Service */ |
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private $api; |
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/** |
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* Create a middleware wrapper function |
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* |
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* @param AuthSchemeResolverInterface $authResolver |
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* @param Service $api |
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* @return Closure |
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*/ |
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public static function wrap(AuthSchemeResolverInterface $authResolver, Service $api) : Closure |
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{ |
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return function (callable $handler) use($authResolver, $api) { |
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return new self($handler, $authResolver, $api); |
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}; |
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} |
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/** |
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* @param callable $nextHandler |
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* @param $authResolver |
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* @param callable $identityProvider |
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* @param Service $api |
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*/ |
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public function __construct(callable $nextHandler, AuthSchemeResolverInterface $authResolver, Service $api) |
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{ |
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$this->nextHandler = $nextHandler; |
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$this->authResolver = $authResolver; |
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$this->api = $api; |
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} |
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/** |
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* @param CommandInterface $command |
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* |
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* @return Promise |
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*/ |
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public function __invoke(CommandInterface $command) |
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{ |
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$nextHandler = $this->nextHandler; |
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$serviceAuth = $this->api->getMetadata('auth') ?: []; |
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$operation = $this->api->getOperation($command->getName()); |
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$operationAuth = $operation['auth'] ?? []; |
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$unsignedPayload = $operation['unsignedpayload'] ?? \false; |
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$resolvableAuth = $operationAuth ?: $serviceAuth; |
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if (!empty($resolvableAuth)) { |
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if (isset($command['@context']['auth_scheme_resolver']) && $command['@context']['auth_scheme_resolver'] instanceof AuthSchemeResolverInterface) { |
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$resolver = $command['@context']['auth_scheme_resolver']; |
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} else { |
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$resolver = $this->authResolver; |
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} |
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$selectedAuthScheme = $resolver->selectAuthScheme($resolvableAuth, ['unsigned_payload' => $unsignedPayload]); |
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if (!empty($selectedAuthScheme)) { |
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$command['@context']['signature_version'] = $selectedAuthScheme; |
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} |
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} |
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return $nextHandler($command); |
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} |
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} |
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