AttributeMetadataDataProvider.php

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<?php
namespace Magento\Customer\Model;

use Magento\Eav\Model\Entity\Attribute\AbstractAttribute;

class AttributeMetadataDataProvider
{
    private $eavConfig;

    private $attrFormCollectionFactory;

    private $storeManager;

    public function __construct(
        \Magento\Eav\Model\Config $eavConfig,
        \Magento\Customer\Model\ResourceModel\Form\Attribute\CollectionFactory $attrFormCollectionFactory,
        \Magento\Store\Model\StoreManager $storeManager
    ) {
        $this->eavConfig = $eavConfig;
        $this->attrFormCollectionFactory = $attrFormCollectionFactory;
        $this->storeManager = $storeManager;
    }

    public function getAttribute($entityType, $attributeCode)
    {
        return $this->eavConfig->getAttribute($entityType, $attributeCode);
    }

    public function getAllAttributeCodes($entityType, $attributeSetId = 0, $storeId = null)
    {
        if (null === $storeId) {
            $storeId = $this->storeManager->getStore()->getId();
        }
        $object = new \Magento\Framework\DataObject(
            [
                'store_id' => $storeId,
                'attribute_set_id' => $attributeSetId,
            ]
        );
        return $this->eavConfig->getEntityAttributeCodes($entityType, $object);
    }

    public function loadAttributesCollection($entityType, $formCode)
    {
        $attributesFormCollection = $this->attrFormCollectionFactory->create();
        $attributesFormCollection->setStore($this->storeManager->getStore())
            ->setEntityType($entityType)
            ->addFormCodeFilter($formCode)
            ->setSortOrder();

        return $attributesFormCollection;
    }
}