CreateLabel.php

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<?php
namespace Magento\Shipping\Controller\Adminhtml\Order\Shipment;

use Magento\Backend\App\Action;

class CreateLabel extends \Magento\Backend\App\Action
{
    const ADMIN_RESOURCE = 'Magento_Sales::shipment';

    protected $shipmentLoader;

    protected $labelGenerator;

    public function __construct(
        Action\Context $context,
        \Magento\Shipping\Controller\Adminhtml\Order\ShipmentLoader $shipmentLoader,
        \Magento\Shipping\Model\Shipping\LabelGenerator $labelGenerator
    ) {
        $this->shipmentLoader = $shipmentLoader;
        $this->labelGenerator = $labelGenerator;
        parent::__construct($context);
    }

    public function execute()
    {
        $response = new \Magento\Framework\DataObject();
        try {
            $this->shipmentLoader->setOrderId($this->getRequest()->getParam('order_id'));
            $this->shipmentLoader->setShipmentId($this->getRequest()->getParam('shipment_id'));
            $this->shipmentLoader->setShipment($this->getRequest()->getParam('shipment'));
            $this->shipmentLoader->setTracking($this->getRequest()->getParam('tracking'));
            $shipment = $this->shipmentLoader->load();
            $this->labelGenerator->create($shipment, $this->_request);
            $shipment->save();
            $this->messageManager->addSuccess(__('You created the shipping label.'));
            $response->setOk(true);
        } catch (\Magento\Framework\Exception\LocalizedException $e) {
            $response->setError(true);
            $response->setMessage($e->getMessage());
        } catch (\Exception $e) {
            $this->_objectManager->get(\Psr\Log\LoggerInterface::class)->critical($e);
            $response->setError(true);
            $response->setMessage(__('An error occurred while creating shipping label.'));
        }

        $this->getResponse()->representJson($response->toJson());
    }
}