AddTrack.php

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

use Magento\Backend\App\Action;

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

    protected $shipmentLoader;

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

    public function execute()
    {
        try {
            $carrier = $this->getRequest()->getPost('carrier');
            $number = $this->getRequest()->getPost('number');
            $title = $this->getRequest()->getPost('title');
            if (empty($carrier)) {
                throw new \Magento\Framework\Exception\LocalizedException(__('Please specify a carrier.'));
            }
            if (empty($number)) {
                throw new \Magento\Framework\Exception\LocalizedException(__('Please enter a tracking number.'));
            }
            $this->shipmentLoader->setOrderId($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 = $this->shipmentLoader->load();
            if ($shipment) {
                $track = $this->_objectManager->create(
                    \Magento\Sales\Model\Order\Shipment\Track::class
                )->setNumber(
                    $number
                )->setCarrierCode(
                    $carrier
                )->setTitle(
                    $title
                );
                $shipment->addTrack($track)->save();

                $this->_view->loadLayout();
                $this->_view->getPage()->getConfig()->getTitle()->prepend(__('Shipments'));
                $response = $this->_view->getLayout()->getBlock('shipment_tracking')->toHtml();
            } else {
                $response = [
                    'error' => true,
                    'message' => __('We can\'t initialize shipment for adding tracking number.'),
                ];
            }
        } catch (\Magento\Framework\Exception\LocalizedException $e) {
            $response = ['error' => true, 'message' => $e->getMessage()];
        } catch (\Exception $e) {
            $response = ['error' => true, 'message' => __('Cannot add tracking number.')];
        }
        if (is_array($response)) {
            $response = $this->_objectManager->get(\Magento\Framework\Json\Helper\Data::class)->jsonEncode($response);
            $this->getResponse()->representJson($response);
        } else {
            $this->getResponse()->setBody($response);
        }
    }
}