FetchRates.php

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<?php
namespace Magento\CurrencySymbol\Controller\Adminhtml\System\Currency;

use Magento\Framework\App\Action\HttpGetActionInterface;
use Magento\Framework\App\Action\HttpPostActionInterface as HttpPostActionInterface;
use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\Controller\ResultFactory;
use Magento\CurrencySymbol\Controller\Adminhtml\System\Currency as CurrencyAction;

class FetchRates extends CurrencyAction implements HttpGetActionInterface, HttpPostActionInterface
{
    public function execute()
    {
        $backendSession = $this->_objectManager->get(\Magento\Backend\Model\Session::class);
        try {
            $service = $this->getRequest()->getParam('rate_services');
            $this->_getSession()->setCurrencyRateService($service);
            if (!$service) {
                throw new LocalizedException(__('The Import Service is incorrect. Verify the service and try again.'));
            }
            try {
                $importModel = $this->_objectManager->get(\Magento\Directory\Model\Currency\Import\Factory::class)
                    ->create($service);
            } catch (\Exception $e) {
                throw new LocalizedException(
                    __("The import model can't be initialized. Verify the model and try again.")
                );
            }
            $rates = $importModel->fetchRates();
            $errors = $importModel->getMessages();
            if (sizeof($errors) > 0) {
                foreach ($errors as $error) {
                    $this->messageManager->addWarning($error);
                }
                $this->messageManager->addWarning(
                    __('Click "Save" to apply the rates we found.')
                );
            } else {
                $this->messageManager->addSuccess(__('Click "Save" to apply the rates we found.'));
            }

            $backendSession->setRates($rates);
        } catch (\Exception $e) {
            $this->messageManager->addError($e->getMessage());
        }

        $resultRedirect = $this->resultFactory->create(ResultFactory::TYPE_REDIRECT);
        return $resultRedirect->setPath('adminhtml/*/');
    }
}