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-rw-r--r--apps/files_sharing/lib/Migration.php274
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diff --git a/apps/files_sharing/lib/Migration.php b/apps/files_sharing/lib/Migration.php
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+<?php
+/**
+ * @author Björn Schießle <schiessle@owncloud.com>
+ * @author Morris Jobke <hey@morrisjobke.de>
+ * @author Roeland Jago Douma <rullzer@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() {
+
+ $stmt = $this->getReShares();
+
+ $owners = [];
+ while($share = $stmt->fetch()) {
+
+ $this->shareCache[$share['id']] = $share;
+
+ $owners[$share['id']] = [
+ 'owner' => $this->findOwner($share),
+ 'initiator' => $share['uid_owner'],
+ 'type' => $share['share_type'],
+ ];
+
+ if (count($owners) === 1000) {
+ $this->updateOwners($owners);
+ $owners = [];
+ }
+ }
+
+ $stmt->closeCursor();
+
+ if (count($owners)) {
+ $this->updateOwners($owners);
+ }
+ }
+
+ /**
+ * update all owner information so that all shares have an owner
+ * and an initiator for the upgrade from oC 8.2 to 9.0 with the new sharing
+ */
+ public function updateInitiatorInfo() {
+ while (true) {
+ $shares = $this->getMissingInitiator(1000);
+
+ if (empty($shares)) {
+ break;
+ }
+
+ $owners = [];
+ foreach ($shares as $share) {
+ $owners[$share['id']] = [
+ 'owner' => $share['uid_owner'],
+ 'initiator' => $share['uid_owner'],
+ 'type' => $share['share_type'],
+ ];
+ }
+ $this->updateOwners($owners);
+ }
+ }
+
+ /**
+ * 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 \Doctrine\DBAL\Driver\Statement
+ */
+ private function getReShares() {
+ $query = $this->connection->getQueryBuilder();
+ $query->select(['id', 'parent', 'uid_owner', 'share_type'])
+ ->from($this->table)
+ ->where($query->expr()->in(
+ 'share_type',
+ $query->createNamedParameter(
+ [
+ \OCP\Share::SHARE_TYPE_USER,
+ \OCP\Share::SHARE_TYPE_GROUP,
+ \OCP\Share::SHARE_TYPE_LINK,
+ \OCP\Share::SHARE_TYPE_REMOTE,
+ ],
+ Connection::PARAM_INT_ARRAY
+ )
+ ))
+ ->andWhere($query->expr()->in(
+ 'item_type',
+ $query->createNamedParameter(
+ ['file', 'folder'],
+ Connection::PARAM_STR_ARRAY
+ )
+ ))
+ ->andWhere($query->expr()->isNotNull('parent'))
+ ->orderBy('id', 'asc');
+ return $query->execute();
+
+
+ $shares = $result->fetchAll();
+ $result->closeCursor();
+
+ $ordered = [];
+ foreach ($shares as $share) {
+ $ordered[(int)$share['id']] = $share;
+ }
+
+ return $ordered;
+ }
+
+ /**
+ * Get $n re-shares from the database
+ *
+ * @param int $n The max number of shares to fetch
+ * @return array
+ */
+ private function getMissingInitiator($n = 1000) {
+ $query = $this->connection->getQueryBuilder();
+ $query->select(['id', 'uid_owner', 'share_type'])
+ ->from($this->table)
+ ->where($query->expr()->in(
+ 'share_type',
+ $query->createNamedParameter(
+ [
+ \OCP\Share::SHARE_TYPE_USER,
+ \OCP\Share::SHARE_TYPE_GROUP,
+ \OCP\Share::SHARE_TYPE_LINK,
+ \OCP\Share::SHARE_TYPE_REMOTE,
+ ],
+ Connection::PARAM_INT_ARRAY
+ )
+ ))
+ ->andWhere($query->expr()->in(
+ 'item_type',
+ $query->createNamedParameter(
+ ['file', 'folder'],
+ Connection::PARAM_STR_ARRAY
+ )
+ ))
+ ->andWhere($query->expr()->isNull('uid_initiator'))
+ ->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('uid_owner', $query->createNamedParameter($owner['owner']))
+ ->set('uid_initiator', $query->createNamedParameter($owner['initiator']));
+
+
+ if ((int)$owner['type'] !== \OCP\Share::SHARE_TYPE_LINK) {
+ $query->set('parent', $query->createNamedParameter(null));
+ }
+
+ $query->where($query->expr()->eq('id', $query->createNamedParameter($id)));
+
+ $query->execute();
+ }
+
+ $this->connection->commit();
+
+ } catch (\Exception $e) {
+ $this->connection->rollBack();
+ throw $e;
+ }
+
+ }
+
+}
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