GetAttributes.php

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<?php
namespace Magento\ConfigurableProduct\Controller\Adminhtml\Product\Attribute;

use Magento\Framework\App\Action\HttpGetActionInterface;
use Magento\Backend\App\Action;
use Magento\ConfigurableProduct\Model\AttributesListInterface;

class GetAttributes extends Action implements HttpGetActionInterface
{
    const ADMIN_RESOURCE = 'Magento_Catalog::products';

    protected $storeManager;

    protected $jsonHelper;

    public function __construct(
        Action\Context $context,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Framework\Json\Helper\Data $jsonHelper,
        AttributesListInterface $attributesList
    ) {
        $this->storeManager = $storeManager;
        $this->jsonHelper = $jsonHelper;
        $this->attributesList = $attributesList;
        parent::__construct($context);
    }

    public function execute()
    {
        $this->storeManager->setCurrentStore(\Magento\Store\Model\Store::ADMIN_CODE);
        $attributes = $this->attributesList->getAttributes($this->getRequest()->getParam('attributes'));
        $this->getResponse()->representJson($this->jsonHelper->jsonEncode($attributes));
    }
}