nextcloud/lib/private/Repair/RemoveLinkShares.php

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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2019, Roeland Jago Douma <roeland@famdouma.nl>
*
* @author Roeland Jago Douma <roeland@famdouma.nl>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OC\Repair;
use Doctrine\DBAL\Driver\Statement;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\DB\QueryBuilder\IQueryBuilder;
use OCP\IConfig;
use OCP\IDBConnection;
use OCP\IGroupManager;
use OCP\Migration\IOutput;
use OCP\Migration\IRepairStep;
use OCP\Notification\IManager;
class RemoveLinkShares implements IRepairStep {
/** @var IDBConnection */
private $connection;
/** @var IConfig */
private $config;
/** @var string[] */
private $userToNotify = [];
/** @var IGroupManager */
private $groupManager;
/** @var IManager */
private $notificationManager;
/** @var ITimeFactory */
private $timeFactory;
public function __construct(IDBConnection $connection,
IConfig $config,
IGroupManager $groupManager,
IManager $notificationManager,
ITimeFactory $timeFactory) {
$this->connection = $connection;
$this->config = $config;
$this->groupManager = $groupManager;
$this->notificationManager = $notificationManager;
$this->timeFactory = $timeFactory;
}
public function getName(): string {
return 'Remove potentially over exposing share links';
}
private function shouldRun(): bool {
$versionFromBeforeUpdate = $this->config->getSystemValue('version', '0.0.0');
if (version_compare($versionFromBeforeUpdate, '14.0.11', '<')) {
return true;
}
if (version_compare($versionFromBeforeUpdate, '15.0.8', '<')) {
return true;
}
if (version_compare($versionFromBeforeUpdate, '16.0.0', '<=')) {
return true;
}
return false;
}
/**
* Delete the share
*
* @param int $id
*/
private function deleteShare(int $id) {
$qb = $this->connection->getQueryBuilder();
$qb->delete('share')
->where($qb->expr()->eq('id', $qb->createNamedParameter($id)));
$qb->execute();
}
/**
* Get the total of affected shares
*
* @return int
*/
private function getTotal(): int {
$subSubQuery = $this->connection->getQueryBuilder();
$subSubQuery->select('*')
->from('share')
->where($subSubQuery->expr()->isNotNull('parent'))
->andWhere($subSubQuery->expr()->eq('share_type', $subSubQuery->expr()->literal(3, IQueryBuilder::PARAM_INT)));
$subQuery = $this->connection->getQueryBuilder();
$subQuery->select('s1.id')
->from($subQuery->createFunction('(' . $subSubQuery->getSQL() . ')'), 's1')
->join(
's1', 'share', 's2',
$subQuery->expr()->eq('s1.parent', 's2.id')
)
->where($subQuery->expr()->orX(
$subQuery->expr()->eq('s2.share_type', $subQuery->expr()->literal(1, IQueryBuilder::PARAM_INT)),
$subQuery->expr()->eq('s2.share_type', $subQuery->expr()->literal(2, IQueryBuilder::PARAM_INT))
))
->andWhere($subQuery->expr()->eq('s1.item_source', 's2.item_source'));
$query = $this->connection->getQueryBuilder();
$query->select($query->func()->count('*', 'total'))
->from('share')
->where($query->expr()->in('id', $query->createFunction('(' . $subQuery->getSQL() . ')')));
$result = $query->execute();
$data = $result->fetch();
$result->closeCursor();
return (int) $data['total'];
}
/**
* Get the cursor to fetch all the shares
*
* @return \Doctrine\DBAL\Driver\Statement
*/
private function getShares(): Statement {
$subQuery = $this->connection->getQueryBuilder();
$subQuery->select('*')
->from('share')
->where($subQuery->expr()->isNotNull('parent'))
->andWhere($subQuery->expr()->eq('share_type', $subQuery->expr()->literal(3, IQueryBuilder::PARAM_INT)));
$query = $this->connection->getQueryBuilder();
$query->select('s1.id', 's1.uid_owner', 's1.uid_initiator')
->from($query->createFunction('(' . $subQuery->getSQL() . ')'), 's1')
->join(
's1', 'share', 's2',
$query->expr()->eq('s1.parent', 's2.id')
)
->where($query->expr()->orX(
$query->expr()->eq('s2.share_type', $query->expr()->literal(1, IQueryBuilder::PARAM_INT)),
$query->expr()->eq('s2.share_type', $query->expr()->literal(2, IQueryBuilder::PARAM_INT))
))
->andWhere($query->expr()->eq('s1.item_source', 's2.item_source'));
return $query->execute();
}
/**
* Process a single share
*
* @param array $data
*/
private function processShare(array $data) {
$id = $data['id'];
$this->addToNotify($data['uid_owner']);
$this->addToNotify($data['uid_initiator']);
$this->deleteShare((int)$id);
}
/**
* Update list of users to notify
*
* @param string $uid
*/
private function addToNotify(string $uid) {
if (!isset($this->userToNotify[$uid])) {
$this->userToNotify[$uid] = true;
}
}
/**
* Send all notifications
*/
private function sendNotification() {
$time = $this->timeFactory->getDateTime();
$notification = $this->notificationManager->createNotification();
$notification->setApp('core')
->setDateTime($time)
->setObject('repair', 'exposing_links')
->setSubject('repair_exposing_links', []);
$users = array_keys($this->userToNotify);
foreach ($users as $user) {
$notification->setUser($user);
$this->notificationManager->notify($notification);
}
}
private function repair(IOutput $output) {
$total = $this->getTotal();
$output->startProgress($total);
$shareCursor = $this->getShares();
while($data = $shareCursor->fetch()) {
$this->processShare($data);
$output->advance();
}
$output->finishProgress();
$shareCursor->closeCursor();
// Notifiy all admins
$adminGroup = $this->groupManager->get('admin');
$adminUsers = $adminGroup->getUsers();
foreach ($adminUsers as $user) {
$this->addToNotify($user->getUID());
}
$output->info('Sending notifications to admins and affected users');
$this->sendNotification();
}
public function run(IOutput $output) {
if ($this->shouldRun()) {
$output->info('Removing potentially over exposing link shares');
$this->repair($output);
$output->info('Removed potentially over exposing link shares');
} else {
$output->info('No need to remove link shares.');
}
}
}