Pdfcreditmemos.php

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<?php
namespace Magento\Sales\Controller\Adminhtml\Creditmemo\AbstractCreditmemo;

use Magento\Framework\App\ResponseInterface;
use Magento\Framework\App\Filesystem\DirectoryList;
use Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection;
use Magento\Sales\Model\Order\Pdf\Creditmemo;
use Magento\Framework\Stdlib\DateTime\DateTime;
use Magento\Backend\App\Action\Context;
use Magento\Framework\App\Response\Http\FileFactory;
use Magento\Ui\Component\MassAction\Filter;
use Magento\Sales\Model\ResourceModel\Order\Creditmemo\CollectionFactory;

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

    protected $fileFactory;

    protected $pdfCreditmemo;

    protected $dateTime;

    public function __construct(
        Context $context,
        Filter $filter,
        Creditmemo $pdfCreditmemo,
        DateTime $dateTime,
        FileFactory $fileFactory,
        CollectionFactory $collectionFactory
    ) {
        $this->pdfCreditmemo = $pdfCreditmemo;
        $this->fileFactory = $fileFactory;
        $this->dateTime = $dateTime;
        $this->collectionFactory = $collectionFactory;
        parent::__construct($context, $filter);
    }

    public function massAction(AbstractCollection $collection)
    {
        $pdf = $this->pdfCreditmemo->getPdf($collection);
        $fileContent = ['type' => 'string', 'value' => $pdf->render(), 'rm' => true];

        return $this->fileFactory->create(
            sprintf('creditmemo%s.pdf', $this->dateTime->date('Y-m-d_H-i-s')),
            $fileContent,
            DirectoryList::VAR_DIR,
            'application/pdf'
        );
    }
}