AsynchronousSchemaRequestProcessor.php

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<?php
declare(strict_types=1);

namespace Magento\WebapiAsync\Controller\Rest;

use Magento\Webapi\Model\Rest\Swagger\Generator;
use Magento\Framework\Webapi\Rest\Response as RestResponse;
use Magento\Framework\Webapi\Request;
use Magento\Webapi\Controller\Rest\RequestProcessorInterface;

class AsynchronousSchemaRequestProcessor implements RequestProcessorInterface
{
    const PROCESSOR_PATH = 'async/schema';
    const BULK_PROCESSOR_PATH = 'async/bulk/schema';

    private $swaggerGenerator;
    private $response;
    private $processorPath;

    public function __construct(
        Generator $swaggerGenerator,
        RestResponse $response,
        $processorPath = self::PROCESSOR_PATH
    ) {
        $this->swaggerGenerator = $swaggerGenerator;
        $this->response = $response;
        $this->processorPath = $processorPath;
    }

    public function process(\Magento\Framework\Webapi\Rest\Request $request)
    {
        $requestedServices = $request->getRequestedServices('all');
        $requestedServices = $requestedServices == Request::ALL_SERVICES
            ? $this->swaggerGenerator->getListOfServices()
            : $requestedServices;
        $responseBody = $this->swaggerGenerator->generate(
            $requestedServices,
            $request->getScheme(),
            $request->getHttpHost(),
            $request->getRequestUri()
        );
        $this->response->setBody($responseBody)->setHeader('Content-Type', 'application/json');
    }

    public function canProcess(\Magento\Framework\Webapi\Rest\Request $request)
    {
        if (strpos(ltrim($request->getPathInfo(), '/'), $this->processorPath) === 0) {
            return true;
        }
        return false;
    }

    public function isBulk(\Magento\Framework\Webapi\Rest\Request $request)
    {
        if (strpos(ltrim($request->getPathInfo(), '/'), self::BULK_PROCESSOR_PATH) === 0) {
            return true;
        }
        return false;
    }
}