Group fixup (#24621)

* Move used OC_Group_xx to \OC\Group

* Add (deprecated) legacy wrapper in legacy, OC_Group_xx

* Replace deprecated use of OC_Group_xx with \OC\Group\xx

7 files changed, 502 insertions, 431 deletions

diff --git a/lib/private/Group/Backend.php b/lib/private/Group/Backend.php
new file mode 100644
index 00000000000..6dd5bdc3507
--- /dev/null
+++ b/lib/private/Group/Backend.php
@@ -0,0 +1,149 @@
+<?php
+/**
+ * @author Arthur Schiwon <blizzz@owncloud.com>
+ * @author Bart Visscher <bartv@thisnet.nl>
+ * @author Jakob Sack <mail@jakobsack.de>
+ * @author Joas Schilling <nickvergessen@owncloud.com>
+ * @author Jörn Friedrich Dreyer <jfd@butonic.de>
+ * @author Lukas Reschke <lukas@owncloud.com>
+ * @author Michael Gapczynski <GapczynskiM@gmail.com>
+ * @author Morris Jobke <hey@morrisjobke.de>
+ * @author Robin Appelman <icewind@owncloud.com>
+ * @author Robin McCorkell <robin@mccorkell.me.uk>
+ * @author Thomas Müller <thomas.mueller@tmit.eu>
+ *
+ * @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 OC\Group;
+
+/**
+ * Abstract base class for user management
+ */
+abstract class Backend implements \OCP\GroupInterface {
+	/**
+	 * error code for functions not provided by the group backend
+	 */
+	const NOT_IMPLEMENTED = -501;
+
+	/**
+	 * actions that user backends can define
+	 */
+	const CREATE_GROUP		= 0x00000001;
+	const DELETE_GROUP		= 0x00000010;
+	const ADD_TO_GROUP		= 0x00000100;
+	const REMOVE_FROM_GOUP	= 0x00001000;
+	//OBSOLETE const GET_DISPLAYNAME	= 0x00010000;
+	const COUNT_USERS		= 0x00100000;
+
+	protected $possibleActions = array(
+		self::CREATE_GROUP => 'createGroup',
+		self::DELETE_GROUP => 'deleteGroup',
+		self::ADD_TO_GROUP => 'addToGroup',
+		self::REMOVE_FROM_GOUP => 'removeFromGroup',
+		self::COUNT_USERS => 'countUsersInGroup',
+	);
+
+	/**
+	* 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 array();
+	}
+
+	/**
+	 * 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 array();
+	}
+
+	/**
+	 * 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 $offset
+	 * @return array an array of user ids
+	 */
+	public function usersInGroup($gid, $search = '', $limit = -1, $offset = 0) {
+		return array();
+	}
+}
diff --git a/lib/private/Group/Database.php b/lib/private/Group/Database.php
new file mode 100644
index 00000000000..9fefdd77300
--- /dev/null
+++ b/lib/private/Group/Database.php
@@ -0,0 +1,338 @@
+<?php
+/**
+ * @author Arthur Schiwon <blizzz@owncloud.com>
+ * @author Bart Visscher <bartv@thisnet.nl>
+ * @author Jakob Sack <mail@jakobsack.de>
+ * @author Joas Schilling <nickvergessen@owncloud.com>
+ * @author Jörn Friedrich Dreyer <jfd@butonic.de>
+ * @author Michael Gapczynski <GapczynskiM@gmail.com>
+ * @author michag86 <micha_g@arcor.de>
+ * @author Morris Jobke <hey@morrisjobke.de>
+ * @author Robin Appelman <icewind@owncloud.com>
+ * @author Robin McCorkell <robin@mccorkell.me.uk>
+ * @author Roeland Jago Douma <rullzer@owncloud.com>
+ * @author Thomas Müller <thomas.mueller@tmit.eu>
+ *
+ * @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/>
+ *
+ */
+/*
+ *
+ * The following SQL statement is just a help for developers and will not be
+ * executed!
+ *
+ * CREATE TABLE `groups` (
+ *   `gid` varchar(64) COLLATE utf8_unicode_ci NOT NULL,
+ *   PRIMARY KEY (`gid`)
+ * ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
+ *
+ * CREATE TABLE `group_user` (
+ *   `gid` varchar(64) COLLATE utf8_unicode_ci NOT NULL,
+ *   `uid` varchar(64) COLLATE utf8_unicode_ci NOT NULL
+ * ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
+ *
+ */
+
+namespace OC\Group;
+
+/**
+ * Class for group management in a SQL Database (e.g. MySQL, SQLite)
+ */
+class Database extends \OC\Group\Backend {
+
+	/** @var string[] */
+	private $groupCache = [];
+
+	/** @var \OCP\IDBConnection */
+	private $dbConn;
+
+	/**
+	 * \OC\Group\Database constructor.
+	 *
+	 * @param \OCP\IDBConnection|null $dbConn
+	 */
+	public function __construct(\OCP\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( $gid ) {
+		$this->fixDI();
+
+		// Add group
+		$result = $this->dbConn->insertIfNotExist('*PREFIX*groups', [
+			'gid' => $gid,
+		]);
+
+		// Add to cache
+		$this->groupCache[$gid] = $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( $gid ) {
+		$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( $uid, $gid ) {
+		$this->fixDI();
+
+		// No duplicate entries!
+		if( !$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( $uid, $gid ) {
+		$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 ) {
+		$this->fixDI();
+
+		// No magic!
+		$qb = $this->dbConn->getQueryBuilder();
+		$cursor = $qb->select('gid')
+			->from('group_user')
+			->where($qb->expr()->eq('uid', $qb->createNamedParameter($uid)))
+			->execute();
+
+		$groups = [];
+		while( $row = $cursor->fetch()) {
+			$groups[] = $row["gid"];
+			$this->groupCache[$row['gid']] = $row['gid'];
+		}
+		$cursor->closeCursor();
+
+		return $groups;
+	}
+
+	/**
+	 * get a list of all groups
+	 * @param string $search
+	 * @param int $limit
+	 * @param int $offset
+	 * @return array an array of group names
+	 *
+	 * Returns a list with all groups
+	 */
+	public function getGroups($search = '', $limit = null, $offset = null) {
+		$parameters = [];
+		$searchLike = '';
+		if ($search !== '') {
+			$parameters[] = '%' . $search . '%';
+			$searchLike = ' WHERE LOWER(`gid`) LIKE LOWER(?)';
+		}
+
+		$stmt = \OC_DB::prepare('SELECT `gid` FROM `*PREFIX*groups`' . $searchLike . ' ORDER BY `gid` ASC', $limit, $offset);
+		$result = $stmt->execute($parameters);
+		$groups = array();
+		while ($row = $result->fetchRow()) {
+			$groups[] = $row['gid'];
+		}
+		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 = $qb->select('gid')
+			->from('groups')
+			->where($qb->expr()->eq('gid', $qb->createNamedParameter($gid)))
+			->execute();
+		$result = $cursor->fetch();
+		$cursor->closeCursor();
+
+		if ($result !== false) {
+			$this->groupCache[$gid] = $gid;
+			return true;
+		}
+		return false;
+	}
+
+	/**
+	 * get a list of all users in a group
+	 * @param string $gid
+	 * @param string $search
+	 * @param int $limit
+	 * @param int $offset
+	 * @return array an array of user ids
+	 */
+	public function usersInGroup($gid, $search = '', $limit = null, $offset = null) {
+		$parameters = [$gid];
+		$searchLike = '';
+		if ($search !== '') {
+			$parameters[] = '%' . $search . '%';
+			$searchLike = ' AND `uid` LIKE ?';
+		}
+
+		$stmt = \OC_DB::prepare('SELECT `uid` FROM `*PREFIX*group_user` WHERE `gid` = ?' . $searchLike . ' ORDER BY `uid` ASC',
+			$limit,
+			$offset);
+		$result = $stmt->execute($parameters);
+		$users = array();
+		while ($row = $result->fetchRow()) {
+			$users[] = $row['uid'];
+		}
+		return $users;
+	}
+
+	/**
+	 * get the number of all users matching the search string in a group
+	 * @param string $gid
+	 * @param string $search
+	 * @return int|false
+	 * @throws \OC\DatabaseException
+	 */
+	public function countUsersInGroup($gid, $search = '') {
+		$parameters = [$gid];
+		$searchLike = '';
+		if ($search !== '') {
+			$parameters[] = '%' . $search . '%';
+			$searchLike = ' AND `uid` LIKE ?';
+		}
+
+		$stmt = \OC_DB::prepare('SELECT COUNT(`uid`) AS `count` FROM `*PREFIX*group_user` WHERE `gid` = ?' . $searchLike);
+		$result = $stmt->execute($parameters);
+		$count = $result->fetchOne();
+		if($count !== false) {
+			$count = intval($count);
+		}
+		return $count;
+	}
+
+}
diff --git a/lib/private/Group/Group.php b/lib/private/Group/Group.php
index 064b9f899e6..c42f53af9a6 100644
--- a/lib/private/Group/Group.php
+++ b/lib/private/Group/Group.php
@@ -46,7 +46,7 @@ class Group implements IGroup {
 	private $usersLoaded;
 
 	/**
-	 * @var \OC_Group_Backend[]|\OC_Group_Database[] $backend
+	 * @var \OC\Group\Backend[]|\OC\Group\Database[] $backend
 	 */
 	private $backends;
 
@@ -62,7 +62,7 @@ class Group implements IGroup {
 
 	/**
 	 * @param string $gid
-	 * @param \OC_Group_Backend[] $backends
+	 * @param \OC\Group\Backend[] $backends
 	 * @param \OC\User\Manager $userManager
 	 * @param \OC\Hooks\PublicEmitter $emitter
 	 */
@@ -136,7 +136,7 @@ class Group implements IGroup {
 			$this->emitter->emit('\OC\Group', 'preAddUser', array($this, $user));
 		}
 		foreach ($this->backends as $backend) {
-			if ($backend->implementsActions(\OC_Group_Backend::ADD_TO_GROUP)) {
+			if ($backend->implementsActions(\OC\Group\Backend::ADD_TO_GROUP)) {
 				$backend->addToGroup($user->getUID(), $this->gid);
 				if ($this->users) {
 					$this->users[$user->getUID()] = $user;
@@ -160,7 +160,7 @@ class Group implements IGroup {
 			$this->emitter->emit('\OC\Group', 'preRemoveUser', array($this, $user));
 		}
 		foreach ($this->backends as $backend) {
-			if ($backend->implementsActions(\OC_Group_Backend::REMOVE_FROM_GOUP) and $backend->inGroup($user->getUID(), $this->gid)) {
+			if ($backend->implementsActions(\OC\Group\Backend::REMOVE_FROM_GOUP) and $backend->inGroup($user->getUID(), $this->gid)) {
 				$backend->removeFromGroup($user->getUID(), $this->gid);
 				$result = true;
 			}
@@ -209,7 +209,7 @@ class Group implements IGroup {
 	public function count($search = '') {
 		$users = false;
 		foreach ($this->backends as $backend) {
-			if($backend->implementsActions(\OC_Group_Backend::COUNT_USERS)) {
+			if($backend->implementsActions(\OC\Group\Backend::COUNT_USERS)) {
 				if($users === false) {
 					//we could directly add to a bool variable, but this would
 					//be ugly
@@ -257,7 +257,7 @@ class Group implements IGroup {
 			$this->emitter->emit('\OC\Group', 'preDelete', array($this));
 		}
 		foreach ($this->backends as $backend) {
-			if ($backend->implementsActions(\OC_Group_Backend::DELETE_GROUP)) {
+			if ($backend->implementsActions(\OC\Group\Backend::DELETE_GROUP)) {
 				$result = true;
 				$backend->deleteGroup($this->gid);
 			}
diff --git a/lib/private/Group/Manager.php b/lib/private/Group/Manager.php
index e82a1d4f2e6..22367180edd 100644
--- a/lib/private/Group/Manager.php
+++ b/lib/private/Group/Manager.php
@@ -190,7 +190,7 @@ class Manager extends PublicEmitter implements IGroupManager {
 		} else {
 			$this->emit('\OC\Group', 'preCreate', array($gid));
 			foreach ($this->backends as $backend) {
-				if ($backend->implementsActions(\OC_Group_Backend::CREATE_GROUP)) {
+				if ($backend->implementsActions(\OC\Group\Backend::CREATE_GROUP)) {
 					$backend->createGroup($gid);
 					$group = $this->getGroupObject($gid);
 					$this->emit('\OC\Group', 'postCreate', array($group));
diff --git a/lib/private/legacy/group.php b/lib/private/legacy/group.php
index f1b84069a38..ceb99389942 100644
--- a/lib/private/legacy/group.php
+++ b/lib/private/legacy/group.php
@@ -66,7 +66,7 @@ class OC_Group {
 
 	/**
 	 * set the group backend
-	 * @param \OC_Group_Backend $backend  The backend to use for user management
+	 * @param \OC\Group\Backend $backend  The backend to use for user management
 	 * @return bool
 	 */
 	public static function useBackend($backend) {
diff --git a/lib/private/legacy/group/backend.php b/lib/private/legacy/group/backend.php
index 3d8d71b1529..a5df9c339b9 100644
--- a/lib/private/legacy/group/backend.php
+++ b/lib/private/legacy/group/backend.php
@@ -53,117 +53,7 @@ define('OC_GROUP_BACKEND_COUNT_USERS',       0x00100000);
 
 /**
  * Abstract base class for user management
+ * @deprecated Since 9.1.0 use \OC\Group\Backend
  */
-abstract class OC_Group_Backend implements \OCP\GroupInterface {
-	/**
-	 * error code for functions not provided by the group backend
-	 */
-	const NOT_IMPLEMENTED = -501;
-
-	/**
-	 * actions that user backends can define
-	 */
-	const CREATE_GROUP		= 0x00000001;
-	const DELETE_GROUP		= 0x00000010;
-	const ADD_TO_GROUP		= 0x00000100;
-	const REMOVE_FROM_GOUP	= 0x00001000;
-	//OBSOLETE const GET_DISPLAYNAME	= 0x00010000;
-	const COUNT_USERS		= 0x00100000;
-
-	protected $possibleActions = array(
-		self::CREATE_GROUP => 'createGroup',
-		self::DELETE_GROUP => 'deleteGroup',
-		self::ADD_TO_GROUP => 'addToGroup',
-		self::REMOVE_FROM_GOUP => 'removeFromGroup',
-		self::COUNT_USERS => 'countUsersInGroup',
-	);
-
-	/**
-	* 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 array();
-	}
-
-	/**
-	 * 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 array();
-	}
-
-	/**
-	 * 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 $offset
-	 * @return array an array of user ids
-	 */
-	public function usersInGroup($gid, $search = '', $limit = -1, $offset = 0) {
-		return array();
-	}
+abstract class OC_Group_Backend extends \OC\Group\Backend {
 }
diff --git a/lib/private/legacy/group/database.php b/lib/private/legacy/group/database.php
index 9ea0bbb8242..3969b3681fe 100644
--- a/lib/private/legacy/group/database.php
+++ b/lib/private/legacy/group/database.php
@@ -1,17 +1,8 @@
 <?php
 /**
- * @author Arthur Schiwon <blizzz@owncloud.com>
- * @author Bart Visscher <bartv@thisnet.nl>
  * @author Jakob Sack <mail@jakobsack.de>
- * @author Joas Schilling <nickvergessen@owncloud.com>
- * @author Jörn Friedrich Dreyer <jfd@butonic.de>
- * @author Michael Gapczynski <GapczynskiM@gmail.com>
- * @author michag86 <micha_g@arcor.de>
  * @author Morris Jobke <hey@morrisjobke.de>
- * @author Robin Appelman <icewind@owncloud.com>
- * @author Robin McCorkell <robin@mccorkell.me.uk>
  * @author Roeland Jago Douma <rullzer@owncloud.com>
- * @author Thomas Müller <thomas.mueller@tmit.eu>
  *
  * @copyright Copyright (c) 2016, ownCloud, Inc.
  * @license AGPL-3.0
@@ -29,308 +20,11 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>
  *
  */
-/*
- *
- * The following SQL statement is just a help for developers and will not be
- * executed!
- *
- * CREATE TABLE `groups` (
- *   `gid` varchar(64) COLLATE utf8_unicode_ci NOT NULL,
- *   PRIMARY KEY (`gid`)
- * ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
- *
- * CREATE TABLE `group_user` (
- *   `gid` varchar(64) COLLATE utf8_unicode_ci NOT NULL,
- *   `uid` varchar(64) COLLATE utf8_unicode_ci NOT NULL
- * ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
- *
- */
 
 /**
- * Class for group management in a SQL Database (e.g. MySQL, SQLite)
+ * Class OC_Group_Database
+ * @deprecated Since 9.1.0 use \OC\Group\Database
  */
-class OC_Group_Database extends OC_Group_Backend {
-
-	/** @var string[] */
-	private $groupCache = [];
-
-	/** @var \OCP\IDBConnection */
-	private $dbConn;
-
-	/**
-	 * OC_Group_Database constructor.
-	 *
-	 * @param \OCP\IDBConnection|null $dbConn
-	 */
-	public function __construct(\OCP\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( $gid ) {
-		$this->fixDI();
-
-		// Add group
-		$result = $this->dbConn->insertIfNotExist('*PREFIX*groups', [
-			'gid' => $gid,
-		]);
-
-		// Add to cache
-		$this->groupCache[$gid] = $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( $gid ) {
-		$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( $uid, $gid ) {
-		$this->fixDI();
-
-		// No duplicate entries!
-		if( !$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( $uid, $gid ) {
-		$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 ) {
-		$this->fixDI();
-
-		// No magic!
-		$qb = $this->dbConn->getQueryBuilder();
-		$cursor = $qb->select('gid')
-			->from('group_user')
-			->where($qb->expr()->eq('uid', $qb->createNamedParameter($uid)))
-			->execute();
-
-		$groups = [];
-		while( $row = $cursor->fetch()) {
-			$groups[] = $row["gid"];
-			$this->groupCache[$row['gid']] = $row['gid'];
-		}
-		$cursor->closeCursor();
-
-		return $groups;
-	}
-
-	/**
-	 * get a list of all groups
-	 * @param string $search
-	 * @param int $limit
-	 * @param int $offset
-	 * @return array an array of group names
-	 *
-	 * Returns a list with all groups
-	 */
-	public function getGroups($search = '', $limit = null, $offset = null) {
-		$parameters = [];
-		$searchLike = '';
-		if ($search !== '') {
-			$parameters[] = '%' . $search . '%';
-			$searchLike = ' WHERE LOWER(`gid`) LIKE LOWER(?)';
-		}
-
-		$stmt = OC_DB::prepare('SELECT `gid` FROM `*PREFIX*groups`' . $searchLike . ' ORDER BY `gid` ASC', $limit, $offset);
-		$result = $stmt->execute($parameters);
-		$groups = array();
-		while ($row = $result->fetchRow()) {
-			$groups[] = $row['gid'];
-		}
-		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 = $qb->select('gid')
-			->from('groups')
-			->where($qb->expr()->eq('gid', $qb->createNamedParameter($gid)))
-			->execute();
-		$result = $cursor->fetch();
-		$cursor->closeCursor();
-
-		if ($result !== false) {
-			$this->groupCache[$gid] = $gid;
-			return true;
-		}
-		return false;
-	}
-
-	/**
-	 * get a list of all users in a group
-	 * @param string $gid
-	 * @param string $search
-	 * @param int $limit
-	 * @param int $offset
-	 * @return array an array of user ids
-	 */
-	public function usersInGroup($gid, $search = '', $limit = null, $offset = null) {
-		$parameters = [$gid];
-		$searchLike = '';
-		if ($search !== '') {
-			$parameters[] = '%' . $search . '%';
-			$searchLike = ' AND `uid` LIKE ?';
-		}
-
-		$stmt = OC_DB::prepare('SELECT `uid` FROM `*PREFIX*group_user` WHERE `gid` = ?' . $searchLike . ' ORDER BY `uid` ASC',
-			$limit,
-			$offset);
-		$result = $stmt->execute($parameters);
-		$users = array();
-		while ($row = $result->fetchRow()) {
-			$users[] = $row['uid'];
-		}
-		return $users;
-	}
-
-	/**
-	 * get the number of all users matching the search string in a group
-	 * @param string $gid
-	 * @param string $search
-	 * @return int|false
-	 * @throws \OC\DatabaseException
-	 */
-	public function countUsersInGroup($gid, $search = '') {
-		$parameters = [$gid];
-		$searchLike = '';
-		if ($search !== '') {
-			$parameters[] = '%' . $search . '%';
-			$searchLike = ' AND `uid` LIKE ?';
-		}
-
-		$stmt = OC_DB::prepare('SELECT COUNT(`uid`) AS `count` FROM `*PREFIX*group_user` WHERE `gid` = ?' . $searchLike);
-		$result = $stmt->execute($parameters);
-		$count = $result->fetchOne();
-		if($count !== false) {
-			$count = intval($count);
-		}
-		return $count;
-	}
-
-}
+class OC_Group_Database extends \OC\Group\Database {
+	
+}
\ No newline at end of file