ConfigurableAttributeData.php

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<?php
namespace Magento\ConfigurableProduct\Model;

use Magento\Catalog\Model\Product;
use Magento\ConfigurableProduct\Model\Product\Type\Configurable\Attribute;

class ConfigurableAttributeData
{
    public function getAttributesData(Product $product, array $options = [])
    {
        $defaultValues = [];
        $attributes = [];
        foreach ($product->getTypeInstance()->getConfigurableAttributes($product) as $attribute) {
            $attributeOptionsData = $this->getAttributeOptionsData($attribute, $options);
            if ($attributeOptionsData) {
                $productAttribute = $attribute->getProductAttribute();
                $attributeId = $productAttribute->getId();
                $attributes[$attributeId] = [
                    'id' => $attributeId,
                    'code' => $productAttribute->getAttributeCode(),
                    'label' => $productAttribute->getStoreLabel($product->getStoreId()),
                    'options' => $attributeOptionsData,
                    'position' => $attribute->getPosition(),
                ];
                $defaultValues[$attributeId] = $this->getAttributeConfigValue($attributeId, $product);
            }
        }
        return [
            'attributes' => $attributes,
            'defaultValues' => $defaultValues,
        ];
    }

    protected function getAttributeOptionsData($attribute, $config)
    {
        $attributeOptionsData = [];
        foreach ($attribute->getOptions() as $attributeOption) {
            $optionId = $attributeOption['value_index'];
            $attributeOptionsData[] = [
                'id' => $optionId,
                'label' => $attributeOption['label'],
                'products' => isset($config[$attribute->getAttributeId()][$optionId])
                    ? $config[$attribute->getAttributeId()][$optionId]
                    : [],
            ];
        }
        return $attributeOptionsData;
    }

    protected function getAttributeConfigValue($attributeId, $product)
    {
        return $product->hasPreconfiguredValues()
            ? $product->getPreconfiguredValues()->getData('super_attribute/' . $attributeId)
            : null;
    }
}