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<?php
/**
* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
* SPDX-License-Identifier: AGPL-3.0-only
*/
namespace OC;
use OC\Tagging\TagMapper;
use OCP\Db\Exception as DBException;
use OCP\DB\QueryBuilder\IQueryBuilder;
use OCP\EventDispatcher\Event;
use OCP\EventDispatcher\IEventListener;
use OCP\IDBConnection;
use OCP\ITagManager;
use OCP\ITags;
use OCP\IUserSession;
use OCP\User\Events\UserDeletedEvent;
use Psr\Log\LoggerInterface;
/**
* @template-implements IEventListener<UserDeletedEvent>
*/
class TagManager implements ITagManager, IEventListener {
private TagMapper $mapper;
private IUserSession $userSession;
private IDBConnection $connection;
private LoggerInterface $logger;
public function __construct(TagMapper $mapper, IUserSession $userSession, IDBConnection $connection, LoggerInterface $logger) {
$this->mapper = $mapper;
$this->userSession = $userSession;
$this->connection = $connection;
$this->logger = $logger;
}
/**
* Create a new \OCP\ITags instance and load tags from db.
*
* @see \OCP\ITags
* @param string $type The type identifier e.g. 'contact' or 'event'.
* @param array $defaultTags An array of default tags to be used if none are stored.
* @param boolean $includeShared Whether to include tags for items shared with this user by others.
* @param string $userId user for which to retrieve the tags, defaults to the currently
* logged in user
* @return \OCP\ITags
*
* since 20.0.0 $includeShared isn't used anymore
*/
public function load($type, $defaultTags = [], $includeShared = false, $userId = null) {
if (is_null($userId)) {
$user = $this->userSession->getUser();
if ($user === null) {
// nothing we can do without a user
return null;
}
$userId = $this->userSession->getUser()->getUId();
}
return new Tags($this->mapper, $userId, $type, $this->logger, $this->connection, $defaultTags);
}
/**
* Get all users who favorited an object
*
* @param string $objectType
* @param int $objectId
* @return array
*/
public function getUsersFavoritingObject(string $objectType, int $objectId): array {
$query = $this->connection->getQueryBuilder();
$query->select('uid')
->from('vcategory_to_object', 'o')
->innerJoin('o', 'vcategory', 'c', $query->expr()->eq('o.categoryid', 'c.id'))
->where($query->expr()->eq('objid', $query->createNamedParameter($objectId, IQueryBuilder::PARAM_INT)))
->andWhere($query->expr()->eq('c.type', $query->createNamedParameter($objectType)))
->andWhere($query->expr()->eq('c.category', $query->createNamedParameter(ITags::TAG_FAVORITE)));
$result = $query->execute();
$users = $result->fetchAll(\PDO::FETCH_COLUMN);
$result->closeCursor();
return $users;
}
public function handle(Event $event): void {
if (!($event instanceof UserDeletedEvent)) {
return;
}
// Find all objectid/tagId pairs.
$user = $event->getUser();
$qb = $this->connection->getQueryBuilder();
$qb->select('id')
->from('vcategory')
->where($qb->expr()->eq('uid', $qb->createNamedParameter($user->getUID())));
try {
$result = $qb->executeQuery();
} catch (DBException $e) {
$this->logger->error($e->getMessage(), [
'app' => 'core',
'exception' => $e,
]);
return;
}
$tagsIds = array_map(fn (array $row) => (int)$row['id'], $result->fetchAll());
$result->closeCursor();
if (count($tagsIds) === 0) {
return;
}
// Clean vcategory_to_object table
$qb = $this->connection->getQueryBuilder();
$qb = $qb->delete('vcategory_to_object')
->where($qb->expr()->in('categoryid', $qb->createParameter('chunk')));
// Clean vcategory
$qb1 = $this->connection->getQueryBuilder();
$qb1 = $qb1->delete('vcategory')
->where($qb1->expr()->in('uid', $qb1->createParameter('chunk')));
foreach (array_chunk($tagsIds, 1000) as $tagChunk) {
$qb->setParameter('chunk', $tagChunk, IQueryBuilder::PARAM_INT_ARRAY);
$qb1->setParameter('chunk', $tagChunk, IQueryBuilder::PARAM_INT_ARRAY);
try {
$qb->executeStatement();
$qb1->executeStatement();
} catch (DBException $e) {
$this->logger->error($e->getMessage(), [
'app' => 'core',
'exception' => $e,
]);
}
}
}
}
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