migrate therinaldos.com data

wedding-pics/lib/private/Group/Backend.php

@@ -0,0 +1,134 @@
+<?php
+/**
+ * @copyright Copyright (c) 2016, ownCloud, Inc.
+ *
+ * @author Christoph Wurst <christoph@winzerhof-wurst.at>
+ * @author Knut Ahlers <knut@ahlers.me>
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ * @author Vincent Petry <vincent@nextcloud.com>
+ *
+ * @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 OC\Group;
+
+/**
+ * Abstract base class for user management
+ */
+abstract class Backend implements \OCP\GroupInterface {
+	/**
+	 * error code for functions not provided by the group backend
+	 */
+	public const NOT_IMPLEMENTED = -501;
+
+	protected $possibleActions = [
+		self::CREATE_GROUP => 'createGroup',
+		self::DELETE_GROUP => 'deleteGroup',
+		self::ADD_TO_GROUP => 'addToGroup',
+		self::REMOVE_FROM_GOUP => 'removeFromGroup',
+		self::COUNT_USERS => 'countUsersInGroup',
+		self::GROUP_DETAILS => 'getGroupDetails',
+		self::IS_ADMIN => 'isAdmin',
+	];
+
+	/**
+	 * Get all supported actions
+	 * @return int bitwise-or'ed actions
+	 *
+	 * Returns the supported actions as int to be
+	 * compared with \OC\Group\Backend::CREATE_GROUP etc.
+	 */
+	public function getSupportedActions() {
+		$actions = 0;
+		foreach ($this->possibleActions as $action => $methodName) {
+			if (method_exists($this, $methodName)) {
+				$actions |= $action;
+			}
+		}
+
+		return $actions;
+	}
+
+	/**
+	 * Check if backend implements actions
+	 * @param int $actions bitwise-or'ed actions
+	 * @return bool
+	 *
+	 * Returns the supported actions as int to be
+	 * compared with \OC\Group\Backend::CREATE_GROUP etc.
+	 */
+	public function implementsActions($actions) {
+		return (bool)($this->getSupportedActions() & $actions);
+	}
+
+	/**
+	 * is user in group?
+	 * @param string $uid uid of the user
+	 * @param string $gid gid of the group
+	 * @return bool
+	 *
+	 * Checks whether the user is member of a group or not.
+	 */
+	public function inGroup($uid, $gid) {
+		return in_array($gid, $this->getUserGroups($uid));
+	}
+
+	/**
+	 * Get all groups a user belongs to
+	 * @param string $uid Name of the user
+	 * @return array an array of group names
+	 *
+	 * This function fetches all groups a user belongs to. It does not check
+	 * if the user exists at all.
+	 */
+	public function getUserGroups($uid) {
+		return [];
+	}
+
+	/**
+	 * get a list of all groups
+	 * @param string $search
+	 * @param int $limit
+	 * @param int $offset
+	 * @return array an array of group names
+	 *
+	 * Returns a list with all groups
+	 */
+
+	public function getGroups($search = '', $limit = -1, $offset = 0) {
+		return [];
+	}
+
+	/**
+	 * check if a group exists
+	 * @param string $gid
+	 * @return bool
+	 */
+	public function groupExists($gid) {
+		return in_array($gid, $this->getGroups($gid, 1));
+	}
+
+	/**
+	 * get a list of all users in a group
+	 * @param string $gid
+	 * @param string $search
+	 * @param int $limit
+	 * @param int $offset
+	 * @return array<int,string> an array of user ids
+	 */
+	public function usersInGroup($gid, $search = '', $limit = -1, $offset = 0) {
+		return [];
+	}
+}

wedding-pics/lib/private/Group/Database.php

@@ -0,0 +1,598 @@
+<?php
+/**
+ * @copyright Copyright (c) 2016, ownCloud, Inc.
+ *
+ * @author Christoph Wurst <christoph@winzerhof-wurst.at>
+ * @author Joas Schilling <coding@schilljs.com>
+ * @author Johannes Leuker <j.leuker@hosting.de>
+ * @author John Molakvoæ <skjnldsv@protonmail.com>
+ * @author Loki3000 <github@labcms.ru>
+ * @author Morris Jobke <hey@morrisjobke.de>
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ * @author tgrant <tom.grant760@gmail.com>
+ * @author Tom Grant <TomG736@users.noreply.github.com>
+ *
+ * @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 OC\Group;
+
+use Doctrine\DBAL\Exception\UniqueConstraintViolationException;
+use OC\User\LazyUser;
+use OCP\DB\QueryBuilder\IQueryBuilder;
+use OCP\Group\Backend\ABackend;
+use OCP\Group\Backend\IAddToGroupBackend;
+use OCP\Group\Backend\IBatchMethodsBackend;
+use OCP\Group\Backend\ICountDisabledInGroup;
+use OCP\Group\Backend\ICountUsersBackend;
+use OCP\Group\Backend\ICreateGroupBackend;
+use OCP\Group\Backend\IDeleteGroupBackend;
+use OCP\Group\Backend\IGetDisplayNameBackend;
+use OCP\Group\Backend\IGroupDetailsBackend;
+use OCP\Group\Backend\INamedBackend;
+use OCP\Group\Backend\IRemoveFromGroupBackend;
+use OCP\Group\Backend\ISearchableGroupBackend;
+use OCP\Group\Backend\ISetDisplayNameBackend;
+use OCP\IDBConnection;
+use OCP\IUserManager;
+
+/**
+ * Class for group management in a SQL Database (e.g. MySQL, SQLite)
+ */
+class Database extends ABackend implements
+	IAddToGroupBackend,
+	ICountDisabledInGroup,
+	ICountUsersBackend,
+	ICreateGroupBackend,
+	IDeleteGroupBackend,
+	IGetDisplayNameBackend,
+	IGroupDetailsBackend,
+	IRemoveFromGroupBackend,
+	ISetDisplayNameBackend,
+	ISearchableGroupBackend,
+	IBatchMethodsBackend,
+	INamedBackend {
+	/** @var array<string, array{gid: string, displayname: string}> */
+	private $groupCache = [];
+	private ?IDBConnection $dbConn;
+
+	/**
+	 * \OC\Group\Database constructor.
+	 *
+	 * @param IDBConnection|null $dbConn
+	 */
+	public function __construct(IDBConnection $dbConn = null) {
+		$this->dbConn = $dbConn;
+	}
+
+	/**
+	 * FIXME: This function should not be required!
+	 */
+	private function fixDI() {
+		if ($this->dbConn === null) {
+			$this->dbConn = \OC::$server->getDatabaseConnection();
+		}
+	}
+
+	/**
+	 * Try to create a new group
+	 * @param string $gid The name of the group to create
+	 * @return bool
+	 *
+	 * Tries to create a new group. If the group name already exists, false will
+	 * be returned.
+	 */
+	public function createGroup(string $gid): bool {
+		$this->fixDI();
+
+		try {
+			// Add group
+			$builder = $this->dbConn->getQueryBuilder();
+			$result = $builder->insert('groups')
+				->setValue('gid', $builder->createNamedParameter($gid))
+				->setValue('displayname', $builder->createNamedParameter($gid))
+				->execute();
+		} catch (UniqueConstraintViolationException $e) {
+			$result = 0;
+		}
+
+		// Add to cache
+		$this->groupCache[$gid] = [
+			'gid' => $gid,
+			'displayname' => $gid
+		];
+
+		return $result === 1;
+	}
+
+	/**
+	 * delete a group
+	 * @param string $gid gid of the group to delete
+	 * @return bool
+	 *
+	 * Deletes a group and removes it from the group_user-table
+	 */
+	public function deleteGroup(string $gid): bool {
+		$this->fixDI();
+
+		// Delete the group
+		$qb = $this->dbConn->getQueryBuilder();
+		$qb->delete('groups')
+			->where($qb->expr()->eq('gid', $qb->createNamedParameter($gid)))
+			->execute();
+
+		// Delete the group-user relation
+		$qb = $this->dbConn->getQueryBuilder();
+		$qb->delete('group_user')
+			->where($qb->expr()->eq('gid', $qb->createNamedParameter($gid)))
+			->execute();
+
+		// Delete the group-groupadmin relation
+		$qb = $this->dbConn->getQueryBuilder();
+		$qb->delete('group_admin')
+			->where($qb->expr()->eq('gid', $qb->createNamedParameter($gid)))
+			->execute();
+
+		// Delete from cache
+		unset($this->groupCache[$gid]);
+
+		return true;
+	}
+
+	/**
+	 * is user in group?
+	 * @param string $uid uid of the user
+	 * @param string $gid gid of the group
+	 * @return bool
+	 *
+	 * Checks whether the user is member of a group or not.
+	 */
+	public function inGroup($uid, $gid) {
+		$this->fixDI();
+
+		// check
+		$qb = $this->dbConn->getQueryBuilder();
+		$cursor = $qb->select('uid')
+			->from('group_user')
+			->where($qb->expr()->eq('gid', $qb->createNamedParameter($gid)))
+			->andWhere($qb->expr()->eq('uid', $qb->createNamedParameter($uid)))
+			->execute();
+
+		$result = $cursor->fetch();
+		$cursor->closeCursor();
+
+		return $result ? true : false;
+	}
+
+	/**
+	 * Add a user to a group
+	 * @param string $uid Name of the user to add to group
+	 * @param string $gid Name of the group in which add the user
+	 * @return bool
+	 *
+	 * Adds a user to a group.
+	 */
+	public function addToGroup(string $uid, string $gid): bool {
+		$this->fixDI();
+
+		// No duplicate entries!
+		if (!$this->inGroup($uid, $gid)) {
+			$qb = $this->dbConn->getQueryBuilder();
+			$qb->insert('group_user')
+				->setValue('uid', $qb->createNamedParameter($uid))
+				->setValue('gid', $qb->createNamedParameter($gid))
+				->execute();
+			return true;
+		} else {
+			return false;
+		}
+	}
+
+	/**
+	 * Removes a user from a group
+	 * @param string $uid Name of the user to remove from group
+	 * @param string $gid Name of the group from which remove the user
+	 * @return bool
+	 *
+	 * removes the user from a group.
+	 */
+	public function removeFromGroup(string $uid, string $gid): bool {
+		$this->fixDI();
+
+		$qb = $this->dbConn->getQueryBuilder();
+		$qb->delete('group_user')
+			->where($qb->expr()->eq('uid', $qb->createNamedParameter($uid)))
+			->andWhere($qb->expr()->eq('gid', $qb->createNamedParameter($gid)))
+			->execute();
+
+		return true;
+	}
+
+	/**
+	 * Get all groups a user belongs to
+	 * @param string $uid Name of the user
+	 * @return array an array of group names
+	 *
+	 * This function fetches all groups a user belongs to. It does not check
+	 * if the user exists at all.
+	 */
+	public function getUserGroups($uid) {
+		//guests has empty or null $uid
+		if ($uid === null || $uid === '') {
+			return [];
+		}
+
+		$this->fixDI();
+
+		// No magic!
+		$qb = $this->dbConn->getQueryBuilder();
+		$cursor = $qb->select('gu.gid', 'g.displayname')
+			->from('group_user', 'gu')
+			->leftJoin('gu', 'groups', 'g', $qb->expr()->eq('gu.gid', 'g.gid'))
+			->where($qb->expr()->eq('uid', $qb->createNamedParameter($uid)))
+			->execute();
+
+		$groups = [];
+		while ($row = $cursor->fetch()) {
+			$groups[] = $row['gid'];
+			$this->groupCache[$row['gid']] = [
+				'gid' => $row['gid'],
+				'displayname' => $row['displayname'],
+			];
+		}
+		$cursor->closeCursor();
+
+		return $groups;
+	}
+
+	/**
+	 * get a list of all groups
+	 * @param string $search
+	 * @param int $limit
+	 * @param int $offset
+	 * @return array an array of group names
+	 *
+	 * Returns a list with all groups
+	 */
+	public function getGroups(string $search = '', int $limit = -1, int $offset = 0) {
+		$this->fixDI();
+
+		$query = $this->dbConn->getQueryBuilder();
+		$query->select('gid', 'displayname')
+			->from('groups')
+			->orderBy('gid', 'ASC');
+
+		if ($search !== '') {
+			$query->where($query->expr()->iLike('gid', $query->createNamedParameter(
+				'%' . $this->dbConn->escapeLikeParameter($search) . '%'
+			)));
+			$query->orWhere($query->expr()->iLike('displayname', $query->createNamedParameter(
+				'%' . $this->dbConn->escapeLikeParameter($search) . '%'
+			)));
+		}
+
+		if ($limit > 0) {
+			$query->setMaxResults($limit);
+		}
+		if ($offset > 0) {
+			$query->setFirstResult($offset);
+		}
+		$result = $query->execute();
+
+		$groups = [];
+		while ($row = $result->fetch()) {
+			$this->groupCache[$row['gid']] = [
+				'displayname' => $row['displayname'],
+				'gid' => $row['gid'],
+			];
+			$groups[] = $row['gid'];
+		}
+		$result->closeCursor();
+
+		return $groups;
+	}
+
+	/**
+	 * check if a group exists
+	 * @param string $gid
+	 * @return bool
+	 */
+	public function groupExists($gid) {
+		$this->fixDI();
+
+		// Check cache first
+		if (isset($this->groupCache[$gid])) {
+			return true;
+		}
+
+		$qb = $this->dbConn->getQueryBuilder();
+		$cursor = $qb->select('gid', 'displayname')
+			->from('groups')
+			->where($qb->expr()->eq('gid', $qb->createNamedParameter($gid)))
+			->execute();
+		$result = $cursor->fetch();
+		$cursor->closeCursor();
+
+		if ($result !== false) {
+			$this->groupCache[$gid] = [
+				'gid' => $gid,
+				'displayname' => $result['displayname'],
+			];
+			return true;
+		}
+		return false;
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function groupsExists(array $gids): array {
+		$notFoundGids = [];
+		$existingGroups = [];
+
+		// In case the data is already locally accessible, not need to do SQL query
+		// or do a SQL query but with a smaller in clause
+		foreach ($gids as $gid) {
+			if (isset($this->groupCache[$gid])) {
+				$existingGroups[] = $gid;
+			} else {
+				$notFoundGids[] = $gid;
+			}
+		}
+
+		$qb = $this->dbConn->getQueryBuilder();
+		$qb->select('gid', 'displayname')
+				->from('groups')
+				->where($qb->expr()->in('gid', $qb->createParameter('ids')));
+		foreach (array_chunk($notFoundGids, 1000) as $chunk) {
+			$qb->setParameter('ids', $chunk, IQueryBuilder::PARAM_STR_ARRAY);
+			$result = $qb->executeQuery();
+			while ($row = $result->fetch()) {
+				$this->groupCache[(string)$row['gid']] = [
+					'displayname' => (string)$row['displayname'],
+					'gid' => (string)$row['gid'],
+				];
+				$existingGroups[] = (string)$row['gid'];
+			}
+			$result->closeCursor();
+		}
+
+		return $existingGroups;
+	}
+
+	/**
+	 * Get a list of all users in a group
+	 * @param string $gid
+	 * @param string $search
+	 * @param int $limit
+	 * @param int $offset
+	 * @return array<int,string> an array of user ids
+	 */
+	public function usersInGroup($gid, $search = '', $limit = -1, $offset = 0): array {
+		return array_values(array_map(fn ($user) => $user->getUid(), $this->searchInGroup($gid, $search, $limit, $offset)));
+	}
+
+	public function searchInGroup(string $gid, string $search = '', int $limit = -1, int $offset = 0): array {
+		$this->fixDI();
+
+		$query = $this->dbConn->getQueryBuilder();
+		$query->select('g.uid', 'u.displayname');
+
+		$query->from('group_user', 'g')
+			->where($query->expr()->eq('gid', $query->createNamedParameter($gid)))
+			->orderBy('g.uid', 'ASC');
+
+		$query->leftJoin('g', 'users', 'u', $query->expr()->eq('g.uid', 'u.uid'));
+
+		if ($search !== '') {
+			$query->leftJoin('u', 'preferences', 'p', $query->expr()->andX(
+				$query->expr()->eq('p.userid', 'u.uid'),
+				$query->expr()->eq('p.appid', $query->expr()->literal('settings')),
+				$query->expr()->eq('p.configkey', $query->expr()->literal('email'))
+			))
+				// sqlite doesn't like re-using a single named parameter here
+				->andWhere(
+					$query->expr()->orX(
+						$query->expr()->ilike('g.uid', $query->createNamedParameter('%' . $this->dbConn->escapeLikeParameter($search) . '%')),
+						$query->expr()->ilike('u.displayname', $query->createNamedParameter('%' . $this->dbConn->escapeLikeParameter($search) . '%')),
+						$query->expr()->ilike('p.configvalue', $query->createNamedParameter('%' . $this->dbConn->escapeLikeParameter($search) . '%'))
+					)
+				)
+				->orderBy('u.uid_lower', 'ASC');
+		}
+
+		if ($limit !== -1) {
+			$query->setMaxResults($limit);
+		}
+		if ($offset !== 0) {
+			$query->setFirstResult($offset);
+		}
+
+		$result = $query->executeQuery();
+
+		$users = [];
+		$userManager = \OCP\Server::get(IUserManager::class);
+		while ($row = $result->fetch()) {
+			$users[$row['uid']] = new LazyUser($row['uid'], $userManager, $row['displayname'] ?? null);
+		}
+		$result->closeCursor();
+
+		return $users;
+	}
+
+	/**
+	 * get the number of all users matching the search string in a group
+	 * @param string $gid
+	 * @param string $search
+	 * @return int
+	 */
+	public function countUsersInGroup(string $gid, string $search = ''): int {
+		$this->fixDI();
+
+		$query = $this->dbConn->getQueryBuilder();
+		$query->select($query->func()->count('*', 'num_users'))
+			->from('group_user')
+			->where($query->expr()->eq('gid', $query->createNamedParameter($gid)));
+
+		if ($search !== '') {
+			$query->andWhere($query->expr()->like('uid', $query->createNamedParameter(
+				'%' . $this->dbConn->escapeLikeParameter($search) . '%'
+			)));
+		}
+
+		$result = $query->execute();
+		$count = $result->fetchOne();
+		$result->closeCursor();
+
+		if ($count !== false) {
+			$count = (int)$count;
+		} else {
+			$count = 0;
+		}
+
+		return $count;
+	}
+
+	/**
+	 * get the number of disabled users in a group
+	 *
+	 * @param string $search
+	 *
+	 * @return int
+	 */
+	public function countDisabledInGroup(string $gid): int {
+		$this->fixDI();
+
+		$query = $this->dbConn->getQueryBuilder();
+		$query->select($query->createFunction('COUNT(DISTINCT ' . $query->getColumnName('uid') . ')'))
+			->from('preferences', 'p')
+			->innerJoin('p', 'group_user', 'g', $query->expr()->eq('p.userid', 'g.uid'))
+			->where($query->expr()->eq('appid', $query->createNamedParameter('core')))
+			->andWhere($query->expr()->eq('configkey', $query->createNamedParameter('enabled')))
+			->andWhere($query->expr()->eq('configvalue', $query->createNamedParameter('false'), IQueryBuilder::PARAM_STR))
+			->andWhere($query->expr()->eq('gid', $query->createNamedParameter($gid), IQueryBuilder::PARAM_STR));
+
+		$result = $query->execute();
+		$count = $result->fetchOne();
+		$result->closeCursor();
+
+		if ($count !== false) {
+			$count = (int)$count;
+		} else {
+			$count = 0;
+		}
+
+		return $count;
+	}
+
+	public function getDisplayName(string $gid): string {
+		if (isset($this->groupCache[$gid])) {
+			$displayName = $this->groupCache[$gid]['displayname'];
+
+			if (isset($displayName) && trim($displayName) !== '') {
+				return $displayName;
+			}
+		}
+
+		$this->fixDI();
+
+		$query = $this->dbConn->getQueryBuilder();
+		$query->select('displayname')
+			->from('groups')
+			->where($query->expr()->eq('gid', $query->createNamedParameter($gid)));
+
+		$result = $query->execute();
+		$displayName = $result->fetchOne();
+		$result->closeCursor();
+
+		return (string) $displayName;
+	}
+
+	public function getGroupDetails(string $gid): array {
+		$displayName = $this->getDisplayName($gid);
+		if ($displayName !== '') {
+			return ['displayName' => $displayName];
+		}
+
+		return [];
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function getGroupsDetails(array $gids): array {
+		$notFoundGids = [];
+		$details = [];
+
+		// In case the data is already locally accessible, not need to do SQL query
+		// or do a SQL query but with a smaller in clause
+		foreach ($gids as $gid) {
+			if (isset($this->groupCache[$gid])) {
+				$details[$gid] = ['displayName' => $this->groupCache[$gid]['displayname']];
+			} else {
+				$notFoundGids[] = $gid;
+			}
+		}
+
+		foreach (array_chunk($notFoundGids, 1000) as $chunk) {
+			$query = $this->dbConn->getQueryBuilder();
+			$query->select('gid', 'displayname')
+				->from('groups')
+				->where($query->expr()->in('gid', $query->createNamedParameter($chunk, IQueryBuilder::PARAM_STR_ARRAY)));
+
+			$result = $query->executeQuery();
+			while ($row = $result->fetch()) {
+				$details[(string)$row['gid']] = ['displayName' => (string)$row['displayname']];
+				$this->groupCache[(string)$row['gid']] = [
+					'displayname' => (string)$row['displayname'],
+					'gid' => (string)$row['gid'],
+				];
+			}
+			$result->closeCursor();
+		}
+
+		return $details;
+	}
+
+	public function setDisplayName(string $gid, string $displayName): bool {
+		if (!$this->groupExists($gid)) {
+			return false;
+		}
+
+		$this->fixDI();
+
+		$displayName = trim($displayName);
+		if ($displayName === '') {
+			$displayName = $gid;
+		}
+
+		$query = $this->dbConn->getQueryBuilder();
+		$query->update('groups')
+			->set('displayname', $query->createNamedParameter($displayName))
+			->where($query->expr()->eq('gid', $query->createNamedParameter($gid)));
+		$query->execute();
+
+		return true;
+	}
+
+	/**
+	 * Backend name to be shown in group management
+	 * @return string the name of the backend to be shown
+	 * @since 21.0.0
+	 */
+	public function getBackendName(): string {
+		return 'Database';
+	}
+}

wedding-pics/lib/private/Group/DisplayNameCache.php

@@ -0,0 +1,93 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright 2022 Anna Larch <anna.larch@gmx.net>
+ * @author Anna Larch <anna.larch@gmx.net>
+ *
+ * @license AGPL-3.0-or-later
+ *
+ * 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 OC\Group;
+
+use OCP\Cache\CappedMemoryCache;
+use OCP\EventDispatcher\Event;
+use OCP\EventDispatcher\IEventListener;
+use OCP\Group\Events\GroupChangedEvent;
+use OCP\Group\Events\GroupDeletedEvent;
+use OCP\ICache;
+use OCP\ICacheFactory;
+use OCP\IGroupManager;
+
+/**
+ * Class that cache the relation Group ID -> Display name
+ *
+ * This saves fetching the group from the backend for "just" the display name
+ */
+class DisplayNameCache implements IEventListener {
+	private CappedMemoryCache $cache;
+	private ICache $memCache;
+	private IGroupManager $groupManager;
+
+	public function __construct(ICacheFactory $cacheFactory, IGroupManager $groupManager) {
+		$this->cache = new CappedMemoryCache();
+		$this->memCache = $cacheFactory->createDistributed('groupDisplayNameMappingCache');
+		$this->groupManager = $groupManager;
+	}
+
+	public function getDisplayName(string $groupId): ?string {
+		if (isset($this->cache[$groupId])) {
+			return $this->cache[$groupId];
+		}
+		$displayName = $this->memCache->get($groupId);
+		if ($displayName) {
+			$this->cache[$groupId] = $displayName;
+			return $displayName;
+		}
+
+		$group = $this->groupManager->get($groupId);
+		if ($group) {
+			$displayName = $group->getDisplayName();
+		} else {
+			$displayName = null;
+		}
+		$this->cache[$groupId] = $displayName;
+		$this->memCache->set($groupId, $displayName, 60 * 10); // 10 minutes
+
+		return $displayName;
+	}
+
+	public function clear(): void {
+		$this->cache = new CappedMemoryCache();
+		$this->memCache->clear();
+	}
+
+	public function handle(Event $event): void {
+		if ($event instanceof GroupChangedEvent && $event->getFeature() === 'displayName') {
+			$groupId = $event->getGroup()->getGID();
+			$newDisplayName = $event->getValue();
+			$this->cache[$groupId] = $newDisplayName;
+			$this->memCache->set($groupId, $newDisplayName, 60 * 10); // 10 minutes
+		}
+		if ($event instanceof GroupDeletedEvent) {
+			$groupId = $event->getGroup()->getGID();
+			unset($this->cache[$groupId]);
+			$this->memCache->remove($groupId);
+		}
+	}
+}

wedding-pics/lib/private/Group/Group.php

@@ -0,0 +1,410 @@
+<?php
+/**
+ * @copyright Copyright (c) 2016, ownCloud, Inc.
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ * @author Bart Visscher <bartv@thisnet.nl>
+ * @author Christoph Wurst <christoph@winzerhof-wurst.at>
+ * @author Joas Schilling <coding@schilljs.com>
+ * @author Johannes Leuker <j.leuker@hosting.de>
+ * @author John Molakvoæ <skjnldsv@protonmail.com>
+ * @author Lukas Reschke <lukas@statuscode.ch>
+ * @author Morris Jobke <hey@morrisjobke.de>
+ * @author Robin Appelman <robin@icewind.nl>
+ * @author Robin McCorkell <robin@mccorkell.me.uk>
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ * @author Vincent Petry <vincent@nextcloud.com>
+ *
+ * @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 OC\Group;
+
+use OC\Hooks\PublicEmitter;
+use OC\User\LazyUser;
+use OCP\EventDispatcher\IEventDispatcher;
+use OCP\Group\Backend\ICountDisabledInGroup;
+use OCP\Group\Backend\IGetDisplayNameBackend;
+use OCP\Group\Backend\IHideFromCollaborationBackend;
+use OCP\Group\Backend\INamedBackend;
+use OCP\Group\Backend\ISearchableGroupBackend;
+use OCP\Group\Backend\ISetDisplayNameBackend;
+use OCP\Group\Events\BeforeGroupChangedEvent;
+use OCP\Group\Events\BeforeGroupDeletedEvent;
+use OCP\Group\Events\BeforeUserAddedEvent;
+use OCP\Group\Events\BeforeUserRemovedEvent;
+use OCP\Group\Events\GroupChangedEvent;
+use OCP\Group\Events\GroupDeletedEvent;
+use OCP\Group\Events\UserAddedEvent;
+use OCP\Group\Events\UserRemovedEvent;
+use OCP\GroupInterface;
+use OCP\IGroup;
+use OCP\IUser;
+use OCP\IUserManager;
+
+class Group implements IGroup {
+	/** @var null|string  */
+	protected $displayName;
+
+	/** @var string */
+	private $gid;
+
+	/** @var \OC\User\User[] */
+	private $users = [];
+
+	/** @var bool */
+	private $usersLoaded;
+
+	/** @var Backend[] */
+	private $backends;
+	/** @var IEventDispatcher */
+	private $dispatcher;
+	/** @var \OC\User\Manager|IUserManager  */
+	private $userManager;
+	/** @var PublicEmitter */
+	private $emitter;
+
+	public function __construct(string $gid, array $backends, IEventDispatcher $dispatcher, IUserManager $userManager, PublicEmitter $emitter = null, ?string $displayName = null) {
+		$this->gid = $gid;
+		$this->backends = $backends;
+		$this->dispatcher = $dispatcher;
+		$this->userManager = $userManager;
+		$this->emitter = $emitter;
+		$this->displayName = $displayName;
+	}
+
+	public function getGID(): string {
+		return $this->gid;
+	}
+
+	public function getDisplayName(): string {
+		if (is_null($this->displayName)) {
+			foreach ($this->backends as $backend) {
+				if ($backend instanceof IGetDisplayNameBackend) {
+					$displayName = $backend->getDisplayName($this->gid);
+					if (trim($displayName) !== '') {
+						$this->displayName = $displayName;
+						return $this->displayName;
+					}
+				}
+			}
+			return $this->gid;
+		}
+		return $this->displayName;
+	}
+
+	public function setDisplayName(string $displayName): bool {
+		$displayName = trim($displayName);
+		if ($displayName !== '') {
+			$this->dispatcher->dispatchTyped(new BeforeGroupChangedEvent($this, 'displayName', $displayName, $this->displayName));
+			foreach ($this->backends as $backend) {
+				if (($backend instanceof ISetDisplayNameBackend)
+					&& $backend->setDisplayName($this->gid, $displayName)) {
+					$this->displayName = $displayName;
+					$this->dispatcher->dispatchTyped(new GroupChangedEvent($this, 'displayName', $displayName, ''));
+					return true;
+				}
+			}
+		}
+		return false;
+	}
+
+	/**
+	 * get all users in the group
+	 *
+	 * @return \OC\User\User[]
+	 */
+	public function getUsers(): array {
+		if ($this->usersLoaded) {
+			return $this->users;
+		}
+
+		$userIds = [];
+		foreach ($this->backends as $backend) {
+			$diff = array_diff(
+				$backend->usersInGroup($this->gid),
+				$userIds
+			);
+			if ($diff) {
+				$userIds = array_merge($userIds, $diff);
+			}
+		}
+
+		$this->users = $this->getVerifiedUsers($userIds);
+		$this->usersLoaded = true;
+		return $this->users;
+	}
+
+	/**
+	 * check if a user is in the group
+	 *
+	 * @param IUser $user
+	 * @return bool
+	 */
+	public function inGroup(IUser $user): bool {
+		if (isset($this->users[$user->getUID()])) {
+			return true;
+		}
+		foreach ($this->backends as $backend) {
+			if ($backend->inGroup($user->getUID(), $this->gid)) {
+				$this->users[$user->getUID()] = $user;
+				return true;
+			}
+		}
+		return false;
+	}
+
+	/**
+	 * add a user to the group
+	 *
+	 * @param IUser $user
+	 */
+	public function addUser(IUser $user): void {
+		if ($this->inGroup($user)) {
+			return;
+		}
+
+		$this->dispatcher->dispatchTyped(new BeforeUserAddedEvent($this, $user));
+
+		if ($this->emitter) {
+			$this->emitter->emit('\OC\Group', 'preAddUser', [$this, $user]);
+		}
+		foreach ($this->backends as $backend) {
+			if ($backend->implementsActions(\OC\Group\Backend::ADD_TO_GROUP)) {
+				$backend->addToGroup($user->getUID(), $this->gid);
+				if ($this->users) {
+					$this->users[$user->getUID()] = $user;
+				}
+
+				$this->dispatcher->dispatchTyped(new UserAddedEvent($this, $user));
+
+				if ($this->emitter) {
+					$this->emitter->emit('\OC\Group', 'postAddUser', [$this, $user]);
+				}
+				return;
+			}
+		}
+	}
+
+	/**
+	 * remove a user from the group
+	 */
+	public function removeUser(IUser $user): void {
+		$result = false;
+		$this->dispatcher->dispatchTyped(new BeforeUserRemovedEvent($this, $user));
+		if ($this->emitter) {
+			$this->emitter->emit('\OC\Group', 'preRemoveUser', [$this, $user]);
+		}
+		foreach ($this->backends as $backend) {
+			if ($backend->implementsActions(\OC\Group\Backend::REMOVE_FROM_GOUP) and $backend->inGroup($user->getUID(), $this->gid)) {
+				$backend->removeFromGroup($user->getUID(), $this->gid);
+				$result = true;
+			}
+		}
+		if ($result) {
+			$this->dispatcher->dispatchTyped(new UserRemovedEvent($this, $user));
+			if ($this->emitter) {
+				$this->emitter->emit('\OC\Group', 'postRemoveUser', [$this, $user]);
+			}
+			if ($this->users) {
+				foreach ($this->users as $index => $groupUser) {
+					if ($groupUser->getUID() === $user->getUID()) {
+						unset($this->users[$index]);
+						return;
+					}
+				}
+			}
+		}
+	}
+
+	/**
+	 * Search for users in the group by userid or display name
+	 * @return IUser[]
+	 */
+	public function searchUsers(string $search, ?int $limit = null, ?int $offset = null): array {
+		$users = [];
+		foreach ($this->backends as $backend) {
+			if ($backend instanceof ISearchableGroupBackend) {
+				$users += $backend->searchInGroup($this->gid, $search, $limit ?? -1, $offset ?? 0);
+			} else {
+				$userIds = $backend->usersInGroup($this->gid, $search, $limit ?? -1, $offset ?? 0);
+				$userManager = \OCP\Server::get(IUserManager::class);
+				foreach ($userIds as $userId) {
+					if (!isset($users[$userId])) {
+						$users[$userId] = new LazyUser($userId, $userManager);
+					}
+				}
+			}
+			if (!is_null($limit) and $limit <= 0) {
+				return $users;
+			}
+		}
+		return $users;
+	}
+
+	/**
+	 * returns the number of users matching the search string
+	 *
+	 * @param string $search
+	 * @return int|bool
+	 */
+	public function count($search = ''): int|bool {
+		$users = false;
+		foreach ($this->backends as $backend) {
+			if ($backend->implementsActions(\OC\Group\Backend::COUNT_USERS)) {
+				if ($users === false) {
+					//we could directly add to a bool variable, but this would
+					//be ugly
+					$users = 0;
+				}
+				$users += $backend->countUsersInGroup($this->gid, $search);
+			}
+		}
+		return $users;
+	}
+
+	/**
+	 * returns the number of disabled users
+	 *
+	 * @return int|bool
+	 */
+	public function countDisabled(): int|bool {
+		$users = false;
+		foreach ($this->backends as $backend) {
+			if ($backend instanceof ICountDisabledInGroup) {
+				if ($users === false) {
+					//we could directly add to a bool variable, but this would
+					//be ugly
+					$users = 0;
+				}
+				$users += $backend->countDisabledInGroup($this->gid);
+			}
+		}
+		return $users;
+	}
+
+	/**
+	 * search for users in the group by displayname
+	 *
+	 * @param string $search
+	 * @param int $limit
+	 * @param int $offset
+	 * @return IUser[]
+	 * @deprecated 27.0.0 Use searchUsers instead (same implementation)
+	 */
+	public function searchDisplayName(string $search, int $limit = null, int $offset = null): array {
+		return $this->searchUsers($search, $limit, $offset);
+	}
+
+	/**
+	 * Get the names of the backend classes the group is connected to
+	 *
+	 * @return string[]
+	 */
+	public function getBackendNames(): array {
+		$backends = [];
+		foreach ($this->backends as $backend) {
+			if ($backend instanceof INamedBackend) {
+				$backends[] = $backend->getBackendName();
+			} else {
+				$backends[] = get_class($backend);
+			}
+		}
+
+		return $backends;
+	}
+
+	/**
+	 * Delete the group
+	 *
+	 * @return bool
+	 */
+	public function delete(): bool {
+		// Prevent users from deleting group admin
+		if ($this->getGID() === 'admin') {
+			return false;
+		}
+
+		$result = false;
+		$this->dispatcher->dispatchTyped(new BeforeGroupDeletedEvent($this));
+		if ($this->emitter) {
+			$this->emitter->emit('\OC\Group', 'preDelete', [$this]);
+		}
+		foreach ($this->backends as $backend) {
+			if ($backend->implementsActions(\OC\Group\Backend::DELETE_GROUP)) {
+				$result = $result || $backend->deleteGroup($this->gid);
+			}
+		}
+		if ($result) {
+			$this->dispatcher->dispatchTyped(new GroupDeletedEvent($this));
+			if ($this->emitter) {
+				$this->emitter->emit('\OC\Group', 'postDelete', [$this]);
+			}
+		}
+		return $result;
+	}
+
+	/**
+	 * returns all the Users from an array that really exists
+	 * @param string[] $userIds an array containing user IDs
+	 * @return \OC\User\User[] an Array with the userId as Key and \OC\User\User as value
+	 */
+	private function getVerifiedUsers(array $userIds): array {
+		$users = [];
+		foreach ($userIds as $userId) {
+			$user = $this->userManager->get($userId);
+			if (!is_null($user)) {
+				$users[$userId] = $user;
+			}
+		}
+		return $users;
+	}
+
+	/**
+	 * @return bool
+	 * @since 14.0.0
+	 */
+	public function canRemoveUser(): bool {
+		foreach ($this->backends as $backend) {
+			if ($backend->implementsActions(GroupInterface::REMOVE_FROM_GOUP)) {
+				return true;
+			}
+		}
+		return false;
+	}
+
+	/**
+	 * @return bool
+	 * @since 14.0.0
+	 */
+	public function canAddUser(): bool {
+		foreach ($this->backends as $backend) {
+			if ($backend->implementsActions(GroupInterface::ADD_TO_GROUP)) {
+				return true;
+			}
+		}
+		return false;
+	}
+
+	/**
+	 * @return bool
+	 * @since 16.0.0
+	 */
+	public function hideFromCollaboration(): bool {
+		return array_reduce($this->backends, function (bool $hide, GroupInterface $backend) {
+			return $hide | ($backend instanceof IHideFromCollaborationBackend && $backend->hideGroup($this->gid));
+		}, false);
+	}
+}

wedding-pics/lib/private/Group/Manager.php

@@ -0,0 +1,492 @@
+<?php
+/**
+ * @copyright Copyright (c) 2016, ownCloud, Inc.
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ * @author Bart Visscher <bartv@thisnet.nl>
+ * @author Bernhard Posselt <dev@bernhard-posselt.com>
+ * @author Christoph Wurst <christoph@winzerhof-wurst.at>
+ * @author Joas Schilling <coding@schilljs.com>
+ * @author John Molakvoæ <skjnldsv@protonmail.com>
+ * @author Jörn Friedrich Dreyer <jfd@butonic.de>
+ * @author Knut Ahlers <knut@ahlers.me>
+ * @author Lukas Reschke <lukas@statuscode.ch>
+ * @author macjohnny <estebanmarin@gmx.ch>
+ * @author Morris Jobke <hey@morrisjobke.de>
+ * @author Robin Appelman <robin@icewind.nl>
+ * @author Robin McCorkell <robin@mccorkell.me.uk>
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ * @author Roman Kreisel <mail@romankreisel.de>
+ * @author Thomas Müller <thomas.mueller@tmit.eu>
+ * @author Vincent Petry <vincent@nextcloud.com>
+ * @author Vinicius Cubas Brand <vinicius@eita.org.br>
+ * @author voxsim "Simon Vocella"
+ * @author Carl Schwan <carl@carlschwan.eu>
+ *
+ * @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 OC\Group;
+
+use OC\Hooks\PublicEmitter;
+use OCP\EventDispatcher\IEventDispatcher;
+use OCP\Group\Backend\IBatchMethodsBackend;
+use OCP\Group\Backend\IGroupDetailsBackend;
+use OCP\Group\Events\BeforeGroupCreatedEvent;
+use OCP\Group\Events\GroupCreatedEvent;
+use OCP\GroupInterface;
+use OCP\ICacheFactory;
+use OCP\IGroup;
+use OCP\IGroupManager;
+use OCP\IUser;
+use Psr\Log\LoggerInterface;
+
+/**
+ * Class Manager
+ *
+ * Hooks available in scope \OC\Group:
+ * - preAddUser(\OC\Group\Group $group, \OC\User\User $user)
+ * - postAddUser(\OC\Group\Group $group, \OC\User\User $user)
+ * - preRemoveUser(\OC\Group\Group $group, \OC\User\User $user)
+ * - postRemoveUser(\OC\Group\Group $group, \OC\User\User $user)
+ * - preDelete(\OC\Group\Group $group)
+ * - postDelete(\OC\Group\Group $group)
+ * - preCreate(string $groupId)
+ * - postCreate(\OC\Group\Group $group)
+ *
+ * @package OC\Group
+ */
+class Manager extends PublicEmitter implements IGroupManager {
+	/** @var GroupInterface[] */
+	private $backends = [];
+
+	/** @var \OC\User\Manager */
+	private $userManager;
+	private IEventDispatcher $dispatcher;
+	private LoggerInterface $logger;
+
+	/** @var array<string, IGroup> */
+	private $cachedGroups = [];
+
+	/** @var array<string, list<string>> */
+	private $cachedUserGroups = [];
+
+	/** @var \OC\SubAdmin */
+	private $subAdmin = null;
+
+	private DisplayNameCache $displayNameCache;
+
+	public function __construct(\OC\User\Manager $userManager,
+		IEventDispatcher $dispatcher,
+		LoggerInterface $logger,
+		ICacheFactory $cacheFactory) {
+		$this->userManager = $userManager;
+		$this->dispatcher = $dispatcher;
+		$this->logger = $logger;
+		$this->displayNameCache = new DisplayNameCache($cacheFactory, $this);
+
+		$cachedGroups = &$this->cachedGroups;
+		$cachedUserGroups = &$this->cachedUserGroups;
+		$this->listen('\OC\Group', 'postDelete', function ($group) use (&$cachedGroups, &$cachedUserGroups) {
+			/**
+			 * @var \OC\Group\Group $group
+			 */
+			unset($cachedGroups[$group->getGID()]);
+			$cachedUserGroups = [];
+		});
+		$this->listen('\OC\Group', 'postAddUser', function ($group) use (&$cachedUserGroups) {
+			/**
+			 * @var \OC\Group\Group $group
+			 */
+			$cachedUserGroups = [];
+		});
+		$this->listen('\OC\Group', 'postRemoveUser', function ($group) use (&$cachedUserGroups) {
+			/**
+			 * @var \OC\Group\Group $group
+			 */
+			$cachedUserGroups = [];
+		});
+	}
+
+	/**
+	 * Checks whether a given backend is used
+	 *
+	 * @param string $backendClass Full classname including complete namespace
+	 * @return bool
+	 */
+	public function isBackendUsed($backendClass) {
+		$backendClass = strtolower(ltrim($backendClass, '\\'));
+
+		foreach ($this->backends as $backend) {
+			if (strtolower(get_class($backend)) === $backendClass) {
+				return true;
+			}
+		}
+
+		return false;
+	}
+
+	/**
+	 * @param \OCP\GroupInterface $backend
+	 */
+	public function addBackend($backend) {
+		$this->backends[] = $backend;
+		$this->clearCaches();
+	}
+
+	public function clearBackends() {
+		$this->backends = [];
+		$this->clearCaches();
+	}
+
+	/**
+	 * Get the active backends
+	 *
+	 * @return \OCP\GroupInterface[]
+	 */
+	public function getBackends() {
+		return $this->backends;
+	}
+
+
+	protected function clearCaches() {
+		$this->cachedGroups = [];
+		$this->cachedUserGroups = [];
+	}
+
+	/**
+	 * @param string $gid
+	 * @return IGroup|null
+	 */
+	public function get($gid) {
+		if (isset($this->cachedGroups[$gid])) {
+			return $this->cachedGroups[$gid];
+		}
+		return $this->getGroupObject($gid);
+	}
+
+	/**
+	 * @param string $gid
+	 * @param string $displayName
+	 * @return \OCP\IGroup|null
+	 */
+	protected function getGroupObject($gid, $displayName = null) {
+		$backends = [];
+		foreach ($this->backends as $backend) {
+			if ($backend->implementsActions(Backend::GROUP_DETAILS)) {
+				$groupData = $backend->getGroupDetails($gid);
+				if (is_array($groupData) && !empty($groupData)) {
+					// take the display name from the last backend that has a non-null one
+					if (is_null($displayName) && isset($groupData['displayName'])) {
+						$displayName = $groupData['displayName'];
+					}
+					$backends[] = $backend;
+				}
+			} elseif ($backend->groupExists($gid)) {
+				$backends[] = $backend;
+			}
+		}
+		if (count($backends) === 0) {
+			return null;
+		}
+		/** @var GroupInterface[] $backends */
+		$this->cachedGroups[$gid] = new Group($gid, $backends, $this->dispatcher, $this->userManager, $this, $displayName);
+		return $this->cachedGroups[$gid];
+	}
+
+	/**
+	 * @brief Batch method to create group objects
+	 *
+	 * @param list<string> $gids List of groupIds for which we want to create a IGroup object
+	 * @param array<string, string> $displayNames Array containing already know display name for a groupId
+	 * @return array<string, IGroup>
+	 */
+	protected function getGroupsObjects(array $gids, array $displayNames = []): array {
+		$backends = [];
+		$groups = [];
+		foreach ($gids as $gid) {
+			$backends[$gid] = [];
+			if (!isset($displayNames[$gid])) {
+				$displayNames[$gid] = null;
+			}
+		}
+		foreach ($this->backends as $backend) {
+			if ($backend instanceof IGroupDetailsBackend || $backend->implementsActions(GroupInterface::GROUP_DETAILS)) {
+				/** @var IGroupDetailsBackend $backend */
+				if ($backend instanceof IBatchMethodsBackend) {
+					$groupDatas = $backend->getGroupsDetails($gids);
+				} else {
+					$groupDatas = [];
+					foreach ($gids as $gid) {
+						$groupDatas[$gid] = $backend->getGroupDetails($gid);
+					}
+				}
+				foreach ($groupDatas as $gid => $groupData) {
+					if (!empty($groupData)) {
+						// take the display name from the last backend that has a non-null one
+						if (isset($groupData['displayName'])) {
+							$displayNames[$gid] = $groupData['displayName'];
+						}
+						$backends[$gid][] = $backend;
+					}
+				}
+			} else {
+				if ($backend instanceof IBatchMethodsBackend) {
+					$existingGroups = $backend->groupsExists($gids);
+				} else {
+					$existingGroups = array_filter($gids, fn (string $gid): bool => $backend->groupExists($gid));
+				}
+				foreach ($existingGroups as $group) {
+					$backends[$group][] = $backend;
+				}
+			}
+		}
+		foreach ($gids as $gid) {
+			if (count($backends[$gid]) === 0) {
+				continue;
+			}
+			$this->cachedGroups[$gid] = new Group($gid, $backends[$gid], $this->dispatcher, $this->userManager, $this, $displayNames[$gid]);
+			$groups[$gid] = $this->cachedGroups[$gid];
+		}
+		return $groups;
+	}
+
+	/**
+	 * @param string $gid
+	 * @return bool
+	 */
+	public function groupExists($gid) {
+		return $this->get($gid) instanceof IGroup;
+	}
+
+	/**
+	 * @param string $gid
+	 * @return IGroup|null
+	 */
+	public function createGroup($gid) {
+		if ($gid === '' || $gid === null) {
+			return null;
+		} elseif ($group = $this->get($gid)) {
+			return $group;
+		} else {
+			$this->dispatcher->dispatchTyped(new BeforeGroupCreatedEvent($gid));
+			$this->emit('\OC\Group', 'preCreate', [$gid]);
+			foreach ($this->backends as $backend) {
+				if ($backend->implementsActions(Backend::CREATE_GROUP)) {
+					if ($backend->createGroup($gid)) {
+						$group = $this->getGroupObject($gid);
+						$this->dispatcher->dispatchTyped(new GroupCreatedEvent($group));
+						$this->emit('\OC\Group', 'postCreate', [$group]);
+						return $group;
+					}
+				}
+			}
+			return null;
+		}
+	}
+
+	/**
+	 * @param string $search
+	 * @param ?int $limit
+	 * @param ?int $offset
+	 * @return \OC\Group\Group[]
+	 */
+	public function search(string $search, ?int $limit = null, ?int $offset = 0) {
+		$groups = [];
+		foreach ($this->backends as $backend) {
+			$groupIds = $backend->getGroups($search, $limit ?? -1, $offset ?? 0);
+			$newGroups = $this->getGroupsObjects($groupIds);
+			foreach ($newGroups as $groupId => $group) {
+				$groups[$groupId] = $group;
+			}
+			if (!is_null($limit) and $limit <= 0) {
+				return array_values($groups);
+			}
+		}
+		return array_values($groups);
+	}
+
+	/**
+	 * @param IUser|null $user
+	 * @return \OC\Group\Group[]
+	 */
+	public function getUserGroups(IUser $user = null) {
+		if (!$user instanceof IUser) {
+			return [];
+		}
+		return $this->getUserIdGroups($user->getUID());
+	}
+
+	/**
+	 * @param string $uid the user id
+	 * @return \OC\Group\Group[]
+	 */
+	public function getUserIdGroups(string $uid): array {
+		$groups = [];
+
+		foreach ($this->getUserIdGroupIds($uid) as $groupId) {
+			$aGroup = $this->get($groupId);
+			if ($aGroup instanceof IGroup) {
+				$groups[$groupId] = $aGroup;
+			} else {
+				$this->logger->debug('User "' . $uid . '" belongs to deleted group: "' . $groupId . '"', ['app' => 'core']);
+			}
+		}
+
+		return $groups;
+	}
+
+	/**
+	 * Checks if a userId is in the admin group
+	 *
+	 * @param string $userId
+	 * @return bool if admin
+	 */
+	public function isAdmin($userId) {
+		foreach ($this->backends as $backend) {
+			if ($backend->implementsActions(Backend::IS_ADMIN) && $backend->isAdmin($userId)) {
+				return true;
+			}
+		}
+		return $this->isInGroup($userId, 'admin');
+	}
+
+	/**
+	 * Checks if a userId is in a group
+	 *
+	 * @param string $userId
+	 * @param string $group
+	 * @return bool if in group
+	 */
+	public function isInGroup($userId, $group) {
+		return in_array($group, $this->getUserIdGroupIds($userId));
+	}
+
+	/**
+	 * get a list of group ids for a user
+	 *
+	 * @param IUser $user
+	 * @return string[] with group ids
+	 */
+	public function getUserGroupIds(IUser $user): array {
+		return $this->getUserIdGroupIds($user->getUID());
+	}
+
+	/**
+	 * @param string $uid the user id
+	 * @return string[]
+	 */
+	private function getUserIdGroupIds(string $uid): array {
+		if (!isset($this->cachedUserGroups[$uid])) {
+			$groups = [];
+			foreach ($this->backends as $backend) {
+				if ($groupIds = $backend->getUserGroups($uid)) {
+					$groups = array_merge($groups, $groupIds);
+				}
+			}
+			$this->cachedUserGroups[$uid] = $groups;
+		}
+
+		return $this->cachedUserGroups[$uid];
+	}
+
+	/**
+	 * @param string $groupId
+	 * @return ?string
+	 */
+	public function getDisplayName(string $groupId): ?string {
+		return $this->displayNameCache->getDisplayName($groupId);
+	}
+
+	/**
+	 * get an array of groupid and displayName for a user
+	 *
+	 * @param IUser $user
+	 * @return array ['displayName' => displayname]
+	 */
+	public function getUserGroupNames(IUser $user) {
+		return array_map(function ($group) {
+			return ['displayName' => $this->displayNameCache->getDisplayName($group->getGID())];
+		}, $this->getUserGroups($user));
+	}
+
+	/**
+	 * get a list of all display names in a group
+	 *
+	 * @param string $gid
+	 * @param string $search
+	 * @param int $limit
+	 * @param int $offset
+	 * @return array an array of display names (value) and user ids (key)
+	 */
+	public function displayNamesInGroup($gid, $search = '', $limit = -1, $offset = 0) {
+		$group = $this->get($gid);
+		if (is_null($group)) {
+			return [];
+		}
+
+		$search = trim($search);
+		$groupUsers = [];
+
+		if (!empty($search)) {
+			// only user backends have the capability to do a complex search for users
+			$searchOffset = 0;
+			$searchLimit = $limit * 100;
+			if ($limit === -1) {
+				$searchLimit = 500;
+			}
+
+			do {
+				$filteredUsers = $this->userManager->searchDisplayName($search, $searchLimit, $searchOffset);
+				foreach ($filteredUsers as $filteredUser) {
+					if ($group->inGroup($filteredUser)) {
+						$groupUsers[] = $filteredUser;
+					}
+				}
+				$searchOffset += $searchLimit;
+			} while (count($groupUsers) < $searchLimit + $offset && count($filteredUsers) >= $searchLimit);
+
+			if ($limit === -1) {
+				$groupUsers = array_slice($groupUsers, $offset);
+			} else {
+				$groupUsers = array_slice($groupUsers, $offset, $limit);
+			}
+		} else {
+			$groupUsers = $group->searchUsers('', $limit, $offset);
+		}
+
+		$matchingUsers = [];
+		foreach ($groupUsers as $groupUser) {
+			$matchingUsers[(string) $groupUser->getUID()] = $groupUser->getDisplayName();
+		}
+		return $matchingUsers;
+	}
+
+	/**
+	 * @return \OC\SubAdmin
+	 */
+	public function getSubAdmin() {
+		if (!$this->subAdmin) {
+			$this->subAdmin = new \OC\SubAdmin(
+				$this->userManager,
+				$this,
+				\OC::$server->getDatabaseConnection(),
+				$this->dispatcher
+			);
+		}
+
+		return $this->subAdmin;
+	}
+}

wedding-pics/lib/private/Group/MetaData.php

@@ -0,0 +1,200 @@
+<?php
+/**
+ * @copyright Copyright (c) 2016, ownCloud, Inc.
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ * @author Christoph Wurst <christoph@winzerhof-wurst.at>
+ * @author Daniel Kesselberg <mail@danielkesselberg.de>
+ * @author Joas Schilling <coding@schilljs.com>
+ * @author John Molakvoæ <skjnldsv@protonmail.com>
+ * @author Lukas Reschke <lukas@statuscode.ch>
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ * @author Stephan Peijnik <speijnik@anexia-it.com>
+ * @author Thomas Müller <thomas.mueller@tmit.eu>
+ *
+ * @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 OC\Group;
+
+use OC\Group\Manager as GroupManager;
+use OCP\IGroup;
+use OCP\IGroupManager;
+use OCP\IUserSession;
+
+class MetaData {
+	public const SORT_NONE = 0;
+	public const SORT_USERCOUNT = 1; // May have performance issues on LDAP backends
+	public const SORT_GROUPNAME = 2;
+
+	/** @var string */
+	protected $user;
+	/** @var bool */
+	protected $isAdmin;
+	/** @var array */
+	protected $metaData = [];
+	/** @var GroupManager */
+	protected $groupManager;
+	/** @var int */
+	protected $sorting = self::SORT_NONE;
+	/** @var IUserSession */
+	protected $userSession;
+
+	/**
+	 * @param string $user the uid of the current user
+	 * @param bool $isAdmin whether the current users is an admin
+	 */
+	public function __construct(
+		string $user,
+		bool $isAdmin,
+		IGroupManager $groupManager,
+		IUserSession $userSession
+	) {
+		$this->user = $user;
+		$this->isAdmin = $isAdmin;
+		$this->groupManager = $groupManager;
+		$this->userSession = $userSession;
+	}
+
+	/**
+	 * returns an array with meta data about all available groups
+	 * the array is structured as follows:
+	 * [0] array containing meta data about admin groups
+	 * [1] array containing meta data about unprivileged groups
+	 * @param string $groupSearch only effective when instance was created with
+	 * isAdmin being true
+	 * @param string $userSearch the pattern users are search for
+	 */
+	public function get(string $groupSearch = '', string $userSearch = ''): array {
+		$key = $groupSearch . '::' . $userSearch;
+		if (isset($this->metaData[$key])) {
+			return $this->metaData[$key];
+		}
+
+		$adminGroups = [];
+		$groups = [];
+		$sortGroupsIndex = 0;
+		$sortGroupsKeys = [];
+		$sortAdminGroupsIndex = 0;
+		$sortAdminGroupsKeys = [];
+
+		foreach ($this->getGroups($groupSearch) as $group) {
+			$groupMetaData = $this->generateGroupMetaData($group, $userSearch);
+			if (strtolower($group->getGID()) !== 'admin') {
+				$this->addEntry(
+					$groups,
+					$sortGroupsKeys,
+					$sortGroupsIndex,
+					$groupMetaData);
+			} else {
+				//admin group is hard coded to 'admin' for now. In future,
+				//backends may define admin groups too. Then the if statement
+				//has to be adjusted accordingly.
+				$this->addEntry(
+					$adminGroups,
+					$sortAdminGroupsKeys,
+					$sortAdminGroupsIndex,
+					$groupMetaData);
+			}
+		}
+
+		//whether sorting is necessary is will be checked in sort()
+		$this->sort($groups, $sortGroupsKeys);
+		$this->sort($adminGroups, $sortAdminGroupsKeys);
+
+		$this->metaData[$key] = [$adminGroups, $groups];
+		return $this->metaData[$key];
+	}
+
+	/**
+	 * sets the sort mode, see SORT_* constants for supported modes
+	 */
+	public function setSorting(int $sortMode): void {
+		switch ($sortMode) {
+			case self::SORT_USERCOUNT:
+			case self::SORT_GROUPNAME:
+				$this->sorting = $sortMode;
+				break;
+
+			default:
+				$this->sorting = self::SORT_NONE;
+		}
+	}
+
+	/**
+	 * adds an group entry to the resulting array
+	 * @param array $entries the resulting array, by reference
+	 * @param array $sortKeys the sort key array, by reference
+	 * @param int $sortIndex the sort key index, by reference
+	 * @param array $data the group's meta data as returned by generateGroupMetaData()
+	 */
+	private function addEntry(array &$entries, array &$sortKeys, int &$sortIndex, array $data): void {
+		$entries[] = $data;
+		if ($this->sorting === self::SORT_USERCOUNT) {
+			$sortKeys[$sortIndex] = $data['usercount'];
+			$sortIndex++;
+		} elseif ($this->sorting === self::SORT_GROUPNAME) {
+			$sortKeys[$sortIndex] = $data['name'];
+			$sortIndex++;
+		}
+	}
+
+	/**
+	 * creates an array containing the group meta data
+	 * @return array with the keys 'id', 'name', 'usercount' and 'disabled'
+	 */
+	private function generateGroupMetaData(IGroup $group, string $userSearch): array {
+		return [
+			'id' => $group->getGID(),
+			'name' => $group->getDisplayName(),
+			'usercount' => $this->sorting === self::SORT_USERCOUNT ? $group->count($userSearch) : 0,
+			'disabled' => $group->countDisabled(),
+			'canAdd' => $group->canAddUser(),
+			'canRemove' => $group->canRemoveUser(),
+		];
+	}
+
+	/**
+	 * sorts the result array, if applicable
+	 * @param array $entries the result array, by reference
+	 * @param array $sortKeys the array containing the sort keys
+	 */
+	private function sort(array &$entries, array $sortKeys): void {
+		if ($this->sorting === self::SORT_USERCOUNT) {
+			array_multisort($sortKeys, SORT_DESC, $entries);
+		} elseif ($this->sorting === self::SORT_GROUPNAME) {
+			array_multisort($sortKeys, SORT_ASC, $entries);
+		}
+	}
+
+	/**
+	 * returns the available groups
+	 * @return IGroup[]
+	 */
+	public function getGroups(string $search = ''): array {
+		if ($this->isAdmin) {
+			return $this->groupManager->search($search);
+		} else {
+			$userObject = $this->userSession->getUser();
+			if ($userObject !== null) {
+				$groups = $this->groupManager->getSubAdmin()->getSubAdminsGroups($userObject);
+			} else {
+				$groups = [];
+			}
+
+			return $groups;
+		}
+	}
+}