Rules.php

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

use Magento\Framework\App\ObjectManager;

class Rules extends \Magento\Framework\Model\ResourceModel\Db\AbstractDb
{
    protected $_rootResource;

    protected $_aclBuilder;

    protected $_logger;

    private $aclDataCache;

    public function __construct(
        \Magento\Framework\Model\ResourceModel\Db\Context $context,
        \Magento\Framework\Acl\Builder $aclBuilder,
        \Psr\Log\LoggerInterface $logger,
        \Magento\Framework\Acl\RootResource $rootResource,
        $connectionName = null,
        \Magento\Framework\Acl\Data\CacheInterface $aclDataCache = null
    ) {
        $this->_aclBuilder = $aclBuilder;
        parent::__construct($context, $connectionName);
        $this->_rootResource = $rootResource;
        $this->_logger = $logger;
        $this->aclDataCache = $aclDataCache ?: ObjectManager::getInstance()->get(
            \Magento\Framework\Acl\Data\CacheInterface::class
        );
    }

    protected function _construct()
    {
        $this->_init('authorization_rule', 'rule_id');
    }

    public function saveRel(\Magento\Authorization\Model\Rules $rule)
    {
        $connection = $this->getConnection();
        try {
            $connection->beginTransaction();
            $roleId = $rule->getRoleId();

            $condition = ['role_id = ?' => (int)$roleId];

            $connection->delete($this->getMainTable(), $condition);

            $postedResources = $rule->getResources();
            if ($postedResources) {
                $row = [
                    'resource_id' => $this->_rootResource->getId(),
                    'privileges' => '', // not used yet
                    'role_id' => $roleId,
                    'permission' => 'allow',
                ];

                // If all was selected save it only and nothing else.
                if ($postedResources === [$this->_rootResource->getId()]) {
                    $insertData = $this->_prepareDataForTable(
                        new \Magento\Framework\DataObject($row),
                        $this->getMainTable()
                    );

                    $connection->insert($this->getMainTable(), $insertData);
                } else {
                    $postedResources[] = \Magento\Backend\App\AbstractAction::ADMIN_RESOURCE;
                    $acl = $this->_aclBuilder->getAcl();
                    foreach ($acl->getResources() as $resourceId) {
                        $row['permission'] = in_array($resourceId, $postedResources) ? 'allow' : 'deny';
                        $row['resource_id'] = $resourceId;

                        $insertData = $this->_prepareDataForTable(
                            new \Magento\Framework\DataObject($row),
                            $this->getMainTable()
                        );
                        $connection->insert($this->getMainTable(), $insertData);
                    }
                }
            }

            $connection->commit();
            $this->aclDataCache->clean();
        } catch (\Magento\Framework\Exception\LocalizedException $e) {
            $connection->rollBack();
            throw $e;
        } catch (\Exception $e) {
            $connection->rollBack();
            $this->_logger->critical($e);
        }
    }
}