SuggestConfigurableAttributes.php

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

use Magento\Backend\App\Action;
use Magento\ConfigurableProduct\Model\SuggestedAttributeList;

class SuggestConfigurableAttributes extends Action
{
    const ADMIN_RESOURCE = 'Magento_Catalog::products';

    protected $attributeList;

    protected $jsonHelper;

    protected $storeManager;

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

    public function execute()
    {
        $this->storeManager->setCurrentStore(\Magento\Store\Model\Store::ADMIN_CODE);

        $this->getResponse()->representJson(
            $this->jsonHelper->jsonEncode(
                $this->attributeList->getSuggestedAttributes($this->getRequest()->getParam('label_part'))
            )
        );
    }
}