CreateOptions.php

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

use Magento\Framework\App\Action\HttpPostActionInterface as HttpPostActionInterface;
use Magento\Backend\App\Action;
use Magento\Catalog\Model\ResourceModel\Eav\AttributeFactory;

class CreateOptions extends Action implements HttpPostActionInterface
{
    const ADMIN_RESOURCE = 'Magento_Catalog::products';

    protected $jsonHelper;

    protected $attributeFactory;

    public function __construct(
        Action\Context $context,
        \Magento\Framework\Json\Helper\Data $jsonHelper,
        AttributeFactory $attributeFactory
    ) {
        $this->jsonHelper = $jsonHelper;
        $this->attributeFactory = $attributeFactory;
        parent::__construct($context);
    }

    public function execute()
    {
        $this->getResponse()->representJson($this->jsonHelper->jsonEncode($this->saveAttributeOptions()));
    }

    protected function saveAttributeOptions()
    {
        $options = (array)$this->getRequest()->getParam('options');
        $savedOptions = [];
        foreach ($options as $option) {
            if (isset($option['label']) && isset($option['is_new'])) {
                $attribute = $this->attributeFactory->create();
                $attribute->load($option['attribute_id']);
                $optionsBefore = $attribute->getSource()->getAllOptions(false);
                $attribute->setOption(
                    [
                        'value' => ['option_0' => [$option['label']]],
                        'order' => ['option_0' => count($optionsBefore) + 1],
                    ]
                );
                $attribute->save();
                $attribute = $this->attributeFactory->create();
                $attribute->load($option['attribute_id']);
                $optionsAfter = $attribute->getSource()->getAllOptions(false);
                $newOption = array_pop($optionsAfter);
                $savedOptions[$option['id']] = $newOption['value'];
            }
        }
        return $savedOptions;
    }
}