Generate.php

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<?php
namespace Magento\SalesRule\Controller\Adminhtml\Promo\Quote;

use Magento\Framework\App\ObjectManager;
use Magento\SalesRule\Model\CouponGenerator;

class Generate extends \Magento\SalesRule\Controller\Adminhtml\Promo\Quote
{
    private $couponGenerator;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Framework\Registry $coreRegistry,
        \Magento\Framework\App\Response\Http\FileFactory $fileFactory,
        \Magento\Framework\Stdlib\DateTime\Filter\Date $dateFilter,
        CouponGenerator $couponGenerator = null
    ) {
        parent::__construct($context, $coreRegistry, $fileFactory, $dateFilter);
        $this->couponGenerator = $couponGenerator ?:
            $this->_objectManager->get(CouponGenerator::class);
    }

    public function execute()
    {
        if (!$this->getRequest()->isAjax()) {
            $this->_forward('noroute');
            return;
        }
        $result = [];
        $this->_initRule();

        $rule = $this->_coreRegistry->registry(\Magento\SalesRule\Model\RegistryConstants::CURRENT_SALES_RULE);

        if (!$rule->getId()) {
            $result['error'] = __('Rule is not defined');
        } else {
            try {
                $data = $this->getRequest()->getParams();
                if (!empty($data['to_date'])) {
                    $inputFilter = new \Zend_Filter_Input(['to_date' => $this->_dateFilter], [], $data);
                    $data = $inputFilter->getUnescaped();
                }

                $couponCodes = $this->couponGenerator->generateCodes($data);
                $generated = count($couponCodes);
                $this->messageManager->addSuccessMessage(__('%1 coupon(s) have been generated.', $generated));
                $this->_view->getLayout()->initMessages();
                $result['messages'] = $this->_view->getLayout()->getMessagesBlock()->getGroupedHtml();
            } catch (\Magento\Framework\Exception\InputException $inputException) {
                $result['error'] = __('Invalid data provided');
            } catch (\Magento\Framework\Exception\LocalizedException $e) {
                $result['error'] = $e->getMessage();
            } catch (\Exception $e) {
                $result['error'] = __(
                    'Something went wrong while generating coupons. Please review the log and try again.'
                );
                $this->_objectManager->get(\Psr\Log\LoggerInterface::class)->critical($e);
            }
        }
        $this->getResponse()->representJson(
            $this->_objectManager->get(\Magento\Framework\Json\Helper\Data::class)->jsonEncode($result)
        );
    }
}