Page.php

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<?php
namespace Magento\Cms\Model\ResourceModel;

use Magento\Cms\Api\Data\PageInterface;
use Magento\Cms\Model\Page as CmsPage;
use Magento\Framework\DB\Select;
use Magento\Framework\EntityManager\EntityManager;
use Magento\Framework\EntityManager\MetadataPool;
use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\Model\AbstractModel;
use Magento\Framework\Model\ResourceModel\Db\AbstractDb;
use Magento\Framework\Model\ResourceModel\Db\Context;
use Magento\Framework\Stdlib\DateTime;
use Magento\Store\Model\Store;
use Magento\Store\Model\StoreManagerInterface;

class Page extends AbstractDb
{
    protected $_store = null;

    protected $_storeManager;

    protected $dateTime;

    protected $entityManager;

    protected $metadataPool;

    public function __construct(
        Context $context,
        StoreManagerInterface $storeManager,
        DateTime $dateTime,
        EntityManager $entityManager,
        MetadataPool $metadataPool,
        $connectionName = null
    ) {
        parent::__construct($context, $connectionName);
        $this->_storeManager = $storeManager;
        $this->dateTime = $dateTime;
        $this->entityManager = $entityManager;
        $this->metadataPool = $metadataPool;
    }

    protected function _construct()
    {
        $this->_init('cms_page', 'page_id');
    }

    public function getConnection()
    {
        return $this->metadataPool->getMetadata(PageInterface::class)->getEntityConnection();
    }

    protected function _beforeSave(AbstractModel $object)
    {
        /*
         * For two attributes which represent timestamp data in DB
         * we should make converting such as:
         * If they are empty we need to convert them into DB
         * type NULL so in DB they will be empty and not some default value
         */
        foreach (['custom_theme_from', 'custom_theme_to'] as $field) {
            $value = !$object->getData($field) ? null : $this->dateTime->formatDate($object->getData($field));
            $object->setData($field, $value);
        }

        if (!$this->isValidPageIdentifier($object)) {
            throw new LocalizedException(
                __(
                    "The page URL key can't use capital letters or disallowed symbols. "
                    . "Remove the letters and symbols and try again."
                )
            );
        }

        if ($this->isNumericPageIdentifier($object)) {
            throw new LocalizedException(
                __("The page URL key can't use only numbers. Add letters or words and try again.")
            );
        }
        return parent::_beforeSave($object);
    }

    private function getPageId(AbstractModel $object, $value, $field = null)
    {
        $entityMetadata = $this->metadataPool->getMetadata(PageInterface::class);

        if (!is_numeric($value) && $field === null) {
            $field = 'identifier';
        } elseif (!$field) {
            $field = $entityMetadata->getIdentifierField();
        }

        $pageId = $value;
        if ($field != $entityMetadata->getIdentifierField() || $object->getStoreId()) {
            $select = $this->_getLoadSelect($field, $value, $object);
            $select->reset(Select::COLUMNS)
                ->columns($this->getMainTable() . '.' . $entityMetadata->getIdentifierField())
                ->limit(1);
            $result = $this->getConnection()->fetchCol($select);
            $pageId = count($result) ? $result[0] : false;
        }
        return $pageId;
    }

    public function load(AbstractModel $object, $value, $field = null)
    {
        $pageId = $this->getPageId($object, $value, $field);
        if ($pageId) {
            $this->entityManager->load($object, $pageId);
        }
        return $this;
    }

    protected function _getLoadSelect($field, $value, $object)
    {
        $entityMetadata = $this->metadataPool->getMetadata(PageInterface::class);
        $linkField = $entityMetadata->getLinkField();

        $select = parent::_getLoadSelect($field, $value, $object);

        if ($object->getStoreId()) {
            $storeIds = [
                Store::DEFAULT_STORE_ID,
                (int)$object->getStoreId(),
            ];
            $select->join(
                ['cms_page_store' => $this->getTable('cms_page_store')],
                $this->getMainTable() . '.' . $linkField . ' = cms_page_store.' . $linkField,
                []
            )
                ->where('is_active = ?', 1)
                ->where('cms_page_store.store_id IN (?)', $storeIds)
                ->order('cms_page_store.store_id DESC')
                ->limit(1);
        }

        return $select;
    }

    protected function _getLoadByIdentifierSelect($identifier, $store, $isActive = null)
    {
        $entityMetadata = $this->metadataPool->getMetadata(PageInterface::class);
        $linkField = $entityMetadata->getLinkField();

        $select = $this->getConnection()->select()
            ->from(['cp' => $this->getMainTable()])
            ->join(
                ['cps' => $this->getTable('cms_page_store')],
                'cp.' . $linkField . ' = cps.' . $linkField,
                []
            )
            ->where('cp.identifier = ?', $identifier)
            ->where('cps.store_id IN (?)', $store);

        if ($isActive !== null) {
            $select->where('cp.is_active = ?', $isActive);
        }

        return $select;
    }

    protected function isNumericPageIdentifier(AbstractModel $object)
    {
        return preg_match('/^[0-9]+$/', $object->getData('identifier'));
    }

    protected function isValidPageIdentifier(AbstractModel $object)
    {
        return preg_match('/^[a-z0-9][a-z0-9_\/-]+(\.[a-z0-9_-]+)?$/', $object->getData('identifier'));
    }

    public function checkIdentifier($identifier, $storeId)
    {
        $entityMetadata = $this->metadataPool->getMetadata(PageInterface::class);

        $stores = [Store::DEFAULT_STORE_ID, $storeId];
        $select = $this->_getLoadByIdentifierSelect($identifier, $stores, 1);
        $select->reset(Select::COLUMNS)
            ->columns('cp.' . $entityMetadata->getIdentifierField())
            ->order('cps.store_id DESC')
            ->limit(1);

        return $this->getConnection()->fetchOne($select);
    }

    public function getCmsPageTitleByIdentifier($identifier)
    {
        $stores = [Store::DEFAULT_STORE_ID];
        if ($this->_store) {
            $stores[] = (int)$this->getStore()->getId();
        }

        $select = $this->_getLoadByIdentifierSelect($identifier, $stores);
        $select->reset(Select::COLUMNS)
            ->columns('cp.title')
            ->order('cps.store_id DESC')
            ->limit(1);

        return $this->getConnection()->fetchOne($select);
    }

    public function getCmsPageTitleById($id)
    {
        $connection = $this->getConnection();
        $entityMetadata = $this->metadataPool->getMetadata(PageInterface::class);

        $select = $connection->select()
            ->from($this->getMainTable(), 'title')
            ->where($entityMetadata->getIdentifierField() . ' = :page_id');

        return $connection->fetchOne($select, ['page_id' => (int)$id]);
    }

    public function getCmsPageIdentifierById($id)
    {
        $connection = $this->getConnection();
        $entityMetadata = $this->metadataPool->getMetadata(PageInterface::class);

        $select = $connection->select()
            ->from($this->getMainTable(), 'identifier')
            ->where($entityMetadata->getIdentifierField() . ' = :page_id');

        return $connection->fetchOne($select, ['page_id' => (int)$id]);
    }

    public function lookupStoreIds($pageId)
    {
        $connection = $this->getConnection();

        $entityMetadata = $this->metadataPool->getMetadata(PageInterface::class);
        $linkField = $entityMetadata->getLinkField();

        $select = $connection->select()
            ->from(['cps' => $this->getTable('cms_page_store')], 'store_id')
            ->join(
                ['cp' => $this->getMainTable()],
                'cps.' . $linkField . ' = cp.' . $linkField,
                []
            )
            ->where('cp.' . $entityMetadata->getIdentifierField() . ' = :page_id');

        return $connection->fetchCol($select, ['page_id' => (int)$pageId]);
    }

    public function setStore($store)
    {
        $this->_store = $store;
        return $this;
    }

    public function getStore()
    {
        return $this->_storeManager->getStore($this->_store);
    }

    public function save(AbstractModel $object)
    {
        $this->entityManager->save($object);
        return $this;
    }

    public function delete(AbstractModel $object)
    {
        $this->entityManager->delete($object);
        return $this;
    }
}