QuoteConfigProductAttributes.php

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<?php
namespace Magento\SalesRule\Model\Plugin;

use Magento\Store\Model\StoreManagerInterface;
use Magento\Customer\Model\Session;
use Magento\SalesRule\Model\ResourceModel\Rule as RuleResource;

class QuoteConfigProductAttributes
{
    protected $_ruleResource;

    public function __construct(RuleResource $ruleResource)
    {
        $this->_ruleResource = $ruleResource;
    }

    public function afterGetProductAttributes(\Magento\Quote\Model\Quote\Config $subject, array $attributeKeys)
    {
        $attributes = $this->_ruleResource->getActiveAttributes();
        foreach ($attributes as $attribute) {
            $attributeKeys[] = $attribute['attribute_code'];
        }
        return $attributeKeys;
    }
}