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<?php
/**
* @author Björn Schießle <schiessle@owncloud.com>
*
* @copyright Copyright (c) 2016, ownCloud, Inc.
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OCA\Files_Sharing;
use Doctrine\DBAL\Connection;
use OCP\IDBConnection;
use OC\Cache\CappedMemoryCache;
/**
* Class Migration
*
* @package OCA\Files_Sharing
* @group DB
*/
class Migration {
/** @var IDBConnection */
private $connection;
/** @var array with all shares we already saw */
private $shareCache;
/** @var string */
private $table = 'share';
public function __construct(IDBConnection $connection) {
$this->connection = $connection;
// We cache up to 10k share items (~20MB)
$this->shareCache = new CappedMemoryCache(10000);
}
/**
* move all re-shares to the owner in order to have a flat list of shares
* upgrade from oC 8.2 to 9.0 with the new sharing
*/
public function removeReShares() {
while(true) {
$reShares = $this->getReShares(1000);
if (empty($reShares)) {
break;
}
// Update the cache
foreach($reShares as $reShare) {
$this->shareCache[$reShare['id']] = $reShare;
}
$owners = [];
foreach ($reShares as $share) {
$owners[$share['id']] = [
'owner' => $this->findOwner($share),
'initiator' => $share['uid_owner']
];
}
$this->updateOwners($owners);
//Clear the cache of the shares we just updated so we have more room
foreach($owners as $id => $owner) {
unset($this->shareCache[$id]);
}
}
}
/**
* find the owner of a re-shared file/folder
*
* @param array $share
* @return array
*/
private function findOwner($share) {
$currentShare = $share;
while(!is_null($currentShare['parent'])) {
if (isset($this->shareCache[$currentShare['parent']])) {
$currentShare = $this->shareCache[$currentShare['parent']];
} else {
$currentShare = $this->getShare((int)$currentShare['parent']);
$this->shareCache[$currentShare['id']] = $currentShare;
}
}
return $currentShare['uid_owner'];
}
/**
* Get $n re-shares from the database
*
* @param int $n The max number of shares to fetch
* @return array
*/
private function getReShares($n = 1000) {
$query = $this->connection->getQueryBuilder();
$query->select(['id', 'parent', 'uid_owner'])
->from($this->table)
->where($query->expr()->in(
'share_type',
$query->createNamedParameter(
[
\OCP\Share::SHARE_TYPE_USER,
\OCP\Share::SHARE_TYPE_GROUP,
\OCP\Share::SHARE_TYPE_LINK
],
Connection::PARAM_INT_ARRAY
)
))
->andWhere($query->expr()->in(
'item_type',
$query->createNamedParameter(
['file', 'folder'],
Connection::PARAM_STR_ARRAY
)
))
->andWhere($query->expr()->isNotNull('parent'))
->orderBy('id', 'asc')
->setMaxResults($n);
$result = $query->execute();
$shares = $result->fetchAll();
$result->closeCursor();
$ordered = [];
foreach ($shares as $share) {
$ordered[(int)$share['id']] = $share;
}
return $ordered;
}
/**
* get a specific share
*
* @param int $id
* @return array
*/
private function getShare($id) {
$query = $this->connection->getQueryBuilder();
$query->select(['id', 'parent', 'uid_owner'])
->from($this->table)
->where($query->expr()->eq('id', $query->createNamedParameter($id)));
$result = $query->execute();
$share = $result->fetchAll();
$result->closeCursor();
return $share[0];
}
/**
* update database with the new owners
*
* @param array $owners
* @throws \Exception
*/
private function updateOwners($owners) {
$this->connection->beginTransaction();
try {
foreach ($owners as $id => $owner) {
$query = $this->connection->getQueryBuilder();
$query->update($this->table)
->set('parent', $query->createNamedParameter(null))
->set('uid_owner', $query->createNamedParameter($owner['owner']))
->set('uid_initiator', $query->createNamedParameter($owner['initiator']))
->where($query->expr()->eq('id', $query->createNamedParameter($id)))
->execute();
}
$this->connection->commit();
} catch (\Exception $e) {
$this->connection->rollBack();
throw $e;
}
}
}
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