Save.php

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<?php
namespace Magento\Cms\Controller\Adminhtml\Page;

use Magento\Framework\App\Action\HttpPostActionInterface as HttpPostActionInterface;
use Magento\Backend\App\Action;
use Magento\Cms\Model\Page;
use Magento\Framework\App\Request\DataPersistorInterface;
use Magento\Framework\Exception\LocalizedException;

class Save extends \Magento\Backend\App\Action implements HttpPostActionInterface
{
    const ADMIN_RESOURCE = 'Magento_Cms::save';

    protected $dataProcessor;

    protected $dataPersistor;

    private $pageFactory;

    private $pageRepository;

    public function __construct(
        Action\Context $context,
        PostDataProcessor $dataProcessor,
        DataPersistorInterface $dataPersistor,
        \Magento\Cms\Model\PageFactory $pageFactory = null,
        \Magento\Cms\Api\PageRepositoryInterface $pageRepository = null
    ) {
        $this->dataProcessor = $dataProcessor;
        $this->dataPersistor = $dataPersistor;
        $this->pageFactory = $pageFactory
            ?: \Magento\Framework\App\ObjectManager::getInstance()->get(\Magento\Cms\Model\PageFactory::class);
        $this->pageRepository = $pageRepository
            ?: \Magento\Framework\App\ObjectManager::getInstance()
                ->get(\Magento\Cms\Api\PageRepositoryInterface::class);
        parent::__construct($context);
    }

    public function execute()
    {
        $data = $this->getRequest()->getPostValue();
        $resultRedirect = $this->resultRedirectFactory->create();
        if ($data) {
            $data = $this->dataProcessor->filter($data);
            if (isset($data['is_active']) && $data['is_active'] === 'true') {
                $data['is_active'] = Page::STATUS_ENABLED;
            }
            if (empty($data['page_id'])) {
                $data['page_id'] = null;
            }

            $model = $this->pageFactory->create();

            $id = $this->getRequest()->getParam('page_id');
            if ($id) {
                try {
                    $model = $this->pageRepository->getById($id);
                } catch (LocalizedException $e) {
                    $this->messageManager->addErrorMessage(__('This page no longer exists.'));
                    return $resultRedirect->setPath('*/*/');
                }
            }

            $model->setData($data);

            $this->_eventManager->dispatch(
                'cms_page_prepare_save',
                ['page' => $model, 'request' => $this->getRequest()]
            );

            if (!$this->dataProcessor->validate($data)) {
                return $resultRedirect->setPath('*/*/edit', ['page_id' => $model->getId(), '_current' => true]);
            }

            try {
                $this->pageRepository->save($model);
                $this->messageManager->addSuccessMessage(__('You saved the page.'));
                return $this->processResultRedirect($model, $resultRedirect, $data);
            } catch (LocalizedException $e) {
                $this->messageManager->addExceptionMessage($e->getPrevious() ?: $e);
            } catch (\Exception $e) {
                $this->messageManager->addExceptionMessage($e, __('Something went wrong while saving the page.'));
            }

            $this->dataPersistor->set('cms_page', $data);
            return $resultRedirect->setPath('*/*/edit', ['page_id' => $this->getRequest()->getParam('page_id')]);
        }
        return $resultRedirect->setPath('*/*/');
    }

    private function processResultRedirect($model, $resultRedirect, $data)
    {
        if ($this->getRequest()->getParam('back', false) === 'duplicate') {
            $newPage = $this->pageFactory->create(['data' => $data]);
            $newPage->setId(null);
            $identifier = $model->getIdentifier() . '-' . uniqid();
            $newPage->setIdentifier($identifier);
            $newPage->setIsActive(false);
            $this->pageRepository->save($newPage);
            $this->messageManager->addSuccessMessage(__('You duplicated the page.'));
            return $resultRedirect->setPath(
                '*/*/edit',
                [
                    'page_id' => $newPage->getId(),
                    '_current' => true
                ]
            );
        }
        $this->dataPersistor->clear('cms_page');
        if ($this->getRequest()->getParam('back')) {
            return $resultRedirect->setPath('*/*/edit', ['page_id' => $model->getId(), '_current' => true]);
        }
        return $resultRedirect->setPath('*/*/');
    }
}