CategoryAttributeReader.php

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<?php
declare(strict_types=1);

namespace Magento\CatalogGraphQl\Model\Config;

use Magento\Catalog\Model\ResourceModel\Category\Attribute\CollectionFactory;
use Magento\Catalog\Model\ResourceModel\Category\Attribute\Collection;
use Magento\Framework\Config\ReaderInterface;
use Magento\Framework\GraphQl\Exception\GraphQlInputException;
use Magento\Framework\Reflection\TypeProcessor;
use Magento\EavGraphQl\Model\Resolver\Query\Type;

class CategoryAttributeReader implements ReaderInterface
{
    private static $bannedSystemAttributes = [
        'position',
        'is_active',
        'children',
        'level',
        'default_sort_by',
        'all_children',
        'page_layout',
        'custom_design',
        'custom_design_from',
        'custom_design_to',
        'custom_layout_update',
        'custom_use_parent_settings',
        'custom_apply_to_products',
    ];

    private $typeLocator;

    private $collectionFactory;

    public function __construct(
        Type $typeLocator,
        CollectionFactory $collectionFactory
    ) {
        $this->typeLocator = $typeLocator;
        $this->collectionFactory = $collectionFactory;
    }

    public function read($scope = null) : array
    {
        $config =[];
        $data = [];
        $collection = $this->collectionFactory->create();
        foreach ($collection as $attribute) {
            $attributeCode = $attribute->getAttributeCode();

            if (in_array($attributeCode, self::$bannedSystemAttributes)) {
                continue;
            }

            $locatedType = $this->typeLocator->getType(
                $attributeCode,
                'catalog_category'
            ) ?: 'String';
            $locatedType = $locatedType === TypeProcessor::NORMALIZED_ANY_TYPE ? 'String' : ucfirst($locatedType);
            $data['fields'][$attributeCode]['name'] = $attributeCode;
            $data['fields'][$attributeCode]['type'] = $locatedType;
            $data['fields'][$attributeCode]['arguments'] = [];
        }

        $config['CategoryInterface'] = $data;
        $config['CategoryTree'] = $data;

        return $config;
    }
}