Magento – Create product attribute with options in magento2 through rest API

I have created a custom module to create product attribute with option thruogh rest Api.

Here is my code samples.

etc/webapi.xml

<route url="/V1/attribute/attributeCreate" method="POST">
    <service class="Vendor\Module\Api\AttributeInterface" method="AttributeOptionCreate"/>
    <resources>
        <resource ref="Vendor_Module::custom"/>
    </resources>
</route>

Api/AttributeInterface.php

namespace Vednor\Module\Api;

interface AttributeInterface
{
/**
 * POST for attribute api
 * @param mixed $param
 * @return array
 */

public function AttributeCreate($params);

/**
 * POST for attribute option api
 * @param mixed $param
 * @return array
 */

public function AttributeDelete($params);

}

etc/di.xml

 <?xml version="1.0"?>
  <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc /config.xsd">

<preference for="Vendor\Module\Api\AttributeInterface"
            type="Vendor\Module\Model\Attribute" />
</config>

Model/Attribute.php

  namespace Vendor\Module\Model;
  use Vendor\Module\Api\AttributeInterface;
  use Magento\Eav\Setup\EavSetupFactory;
  use Magento\Store\Model\StoreManagerInterface;
  class Attribute implements AttributeInterface
  {
   protected $_eavSetupFactory;
   protected $_storeManager;
   protected $_attributeFactory;
   protected $eavAttributeFactory;
   protected $attributeOptionManagement;
   protected $productFactory;

   private $productAttributeRepository;
    public function __construct(
    \Magento\Framework\ObjectManagerInterface $objectManager,
    \Magento\Eav\Setup\EavSetupFactory $eavSetupFactory,
    \Magento\Store\Model\StoreManagerInterface $storeManager,
    \Magento\Catalog\Model\ResourceModel\Eav\Attribute $attributeFactory,
    \Magento\Eav\Model\Entity\AttributeFactory $eavAttributeFactory,
    \Magento\Eav\Api\AttributeOptionManagementInterface $attributeOptionManagement,
    \Magento\Catalog\Model\ProductFactory $productFactory,
    \Magento\Catalog\Model\Product\Attribute\Repository $productAttributeRepository
) {
    $this->_objectManager = $objectManager;
    $this->_eavSetupFactory = $eavSetupFactory;
    $this->_storeManager = $storeManager;
    $this->_attributeFactory = $attributeFactory;
    $this->eavAttributeFactory = $eavAttributeFactory;
    $this->attributeOptionManagement = $attributeOptionManagement;
    $this->productFactory = $productFactory;        
    $this->productAttributeRepository = $productAttributeRepository;
}

public function AttributeCreate($params) {
    return 'Response: ' . json_encode($params); exit;
    $resultArr = array();
    $paramArr = array();
    $result =  json_encode($params);
    $resultSet = json_decode($result,true);
   }

 }

I have my json request like below

{
  "params":{  
     "Attribute":"brand",
      "OptionValues":{  
         "Value": "test1",
         "Value": "test2",
         "Value": "test3"
   }
  }
}

I am looking for logic to create attribute with option in my Model file.

I need to create attribute with the respective type, like dropdown, text and boolean.

As i checked finding code from installer only. can we create attributes from custom api like above.

Can anyone help me on this pls. Thanks in Advance