MassPrintShippingLabel.php

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

use Magento\Backend\App\Action;
use Magento\Framework\App\ResponseInterface;
use Magento\Framework\App\Filesystem\DirectoryList;
use Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection;
use Magento\Ui\Component\MassAction\Filter;
use Magento\Backend\App\Action\Context;
use Magento\Shipping\Model\Shipping\LabelGenerator;
use Magento\Framework\App\Response\Http\FileFactory;
use Magento\Sales\Model\ResourceModel\Order\Shipment\CollectionFactory as ShipmentCollectionFactory;
use Magento\Framework\Controller\ResultInterface;
use Magento\Sales\Model\ResourceModel\Order\CollectionFactory;

class MassPrintShippingLabel extends \Magento\Sales\Controller\Adminhtml\Order\AbstractMassAction
{
    const ADMIN_RESOURCE = 'Magento_Sales::shipment';

    protected $labelGenerator;

    protected $fileFactory;

    protected $collectionFactory;

    protected $shipmentCollectionFactory;

    public function __construct(
        Context $context,
        Filter $filter,
        CollectionFactory $collectionFactory,
        FileFactory $fileFactory,
        LabelGenerator $labelGenerator,
        ShipmentCollectionFactory $shipmentCollectionFactory
    ) {
        $this->fileFactory = $fileFactory;
        $this->collectionFactory = $collectionFactory;
        $this->shipmentCollectionFactory = $shipmentCollectionFactory;
        $this->labelGenerator = $labelGenerator;
        parent::__construct($context, $filter);
    }

    protected function massAction(AbstractCollection $collection)
    {
        $labelsContent = [];
        $shipments = $this->shipmentCollectionFactory->create()->setOrderFilter(['in' => $collection->getAllIds()]);

        if ($shipments->getSize()) {
            foreach ($shipments as $shipment) {
                $labelContent = $shipment->getShippingLabel();
                if ($labelContent) {
                    $labelsContent[] = $labelContent;
                }
            }
        }

        if (!empty($labelsContent)) {
            $outputPdf = $this->labelGenerator->combineLabelsPdf($labelsContent);
            return $this->fileFactory->create(
                'ShippingLabels.pdf',
                $outputPdf->render(),
                DirectoryList::VAR_DIR,
                'application/pdf'
            );
        }

        $this->messageManager->addError(__('There are no shipping labels related to selected orders.'));
        return $this->resultRedirectFactory->create()->setPath('sales/order/');
    }
}