Merge pull request #8935 from nextcloud/backend_interfaces

Backend interfaces

13 files changed, 435 insertions, 16 deletions

diff --git a/lib/composer/composer/autoload_classmap.php b/lib/composer/composer/autoload_classmap.php
index ecd7f155c0e..032b7f5ea17 100644
--- a/lib/composer/composer/autoload_classmap.php
+++ b/lib/composer/composer/autoload_classmap.php
@@ -302,6 +302,15 @@ return array(
     'OCP\\Template' => $baseDir . '/lib/public/Template.php',
     'OCP\\User' => $baseDir . '/lib/public/User.php',
     'OCP\\UserInterface' => $baseDir . '/lib/public/UserInterface.php',
+    'OCP\\User\\Backend\\ABackend' => $baseDir . '/lib/public/User/Backend/ABackend.php',
+    'OCP\\User\\Backend\\ICheckPasswordBackend' => $baseDir . '/lib/public/User/Backend/ICheckPasswordBackend.php',
+    'OCP\\User\\Backend\\ICountUsersBackend' => $baseDir . '/lib/public/User/Backend/ICountUsersBackend.php',
+    'OCP\\User\\Backend\\ICreateUserBackend' => $baseDir . '/lib/public/User/Backend/ICreateUserBackend.php',
+    'OCP\\User\\Backend\\IGetDisplayNameBackend' => $baseDir . '/lib/public/User/Backend/IGetDisplayNameBackend.php',
+    'OCP\\User\\Backend\\IGetHomeBackend' => $baseDir . '/lib/public/User/Backend/IGetHomeBackend.php',
+    'OCP\\User\\Backend\\IProvideAvatarBackend' => $baseDir . '/lib/public/User/Backend/IProvideAvatarBackend.php',
+    'OCP\\User\\Backend\\ISetDisplayNameBackend' => $baseDir . '/lib/public/User/Backend/ISetDisplayNameBackend.php',
+    'OCP\\User\\Backend\\ISetPasswordBackend' => $baseDir . '/lib/public/User/Backend/ISetPasswordBackend.php',
     'OCP\\Util' => $baseDir . '/lib/public/Util.php',
     'OCP\\WorkflowEngine\\ICheck' => $baseDir . '/lib/public/WorkflowEngine/ICheck.php',
     'OCP\\WorkflowEngine\\IManager' => $baseDir . '/lib/public/WorkflowEngine/IManager.php',
diff --git a/lib/composer/composer/autoload_static.php b/lib/composer/composer/autoload_static.php
index 8fbff8a1e13..8159a65f3ce 100644
--- a/lib/composer/composer/autoload_static.php
+++ b/lib/composer/composer/autoload_static.php
@@ -332,6 +332,15 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
         'OCP\\Template' => __DIR__ . '/../../..' . '/lib/public/Template.php',
         'OCP\\User' => __DIR__ . '/../../..' . '/lib/public/User.php',
         'OCP\\UserInterface' => __DIR__ . '/../../..' . '/lib/public/UserInterface.php',
+        'OCP\\User\\Backend\\ABackend' => __DIR__ . '/../../..' . '/lib/public/User/Backend/ABackend.php',
+        'OCP\\User\\Backend\\ICheckPasswordBackend' => __DIR__ . '/../../..' . '/lib/public/User/Backend/ICheckPasswordBackend.php',
+        'OCP\\User\\Backend\\ICountUsersBackend' => __DIR__ . '/../../..' . '/lib/public/User/Backend/ICountUsersBackend.php',
+        'OCP\\User\\Backend\\ICreateUserBackend' => __DIR__ . '/../../..' . '/lib/public/User/Backend/ICreateUserBackend.php',
+        'OCP\\User\\Backend\\IGetDisplayNameBackend' => __DIR__ . '/../../..' . '/lib/public/User/Backend/IGetDisplayNameBackend.php',
+        'OCP\\User\\Backend\\IGetHomeBackend' => __DIR__ . '/../../..' . '/lib/public/User/Backend/IGetHomeBackend.php',
+        'OCP\\User\\Backend\\IProvideAvatarBackend' => __DIR__ . '/../../..' . '/lib/public/User/Backend/IProvideAvatarBackend.php',
+        'OCP\\User\\Backend\\ISetDisplayNameBackend' => __DIR__ . '/../../..' . '/lib/public/User/Backend/ISetDisplayNameBackend.php',
+        'OCP\\User\\Backend\\ISetPasswordBackend' => __DIR__ . '/../../..' . '/lib/public/User/Backend/ISetPasswordBackend.php',
         'OCP\\Util' => __DIR__ . '/../../..' . '/lib/public/Util.php',
         'OCP\\WorkflowEngine\\ICheck' => __DIR__ . '/../../..' . '/lib/public/WorkflowEngine/ICheck.php',
         'OCP\\WorkflowEngine\\IManager' => __DIR__ . '/../../..' . '/lib/public/WorkflowEngine/IManager.php',
diff --git a/lib/private/User/Database.php b/lib/private/User/Database.php
index 8dad3ef5fcd..d92390cdc96 100644
--- a/lib/private/User/Database.php
+++ b/lib/private/User/Database.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 /**
  * @copyright Copyright (c) 2016, ownCloud, Inc.
  *
@@ -57,8 +58,14 @@
 namespace OC\User;
 
 use OC\Cache\CappedMemoryCache;
-use OC\DB\QueryBuilder\Literal;
-use OCP\IUserBackend;
+use OCP\User\Backend\ABackend;
+use OCP\User\Backend\ICheckPasswordBackend;
+use OCP\User\Backend\ICountUsersBackend;
+use OCP\User\Backend\ICreateUserBackend;
+use OCP\User\Backend\IGetDisplayNameBackend;
+use OCP\User\Backend\IGetHomeBackend;
+use OCP\User\Backend\ISetDisplayNameBackend;
+use OCP\User\Backend\ISetPasswordBackend;
 use OCP\Util;
 use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\EventDispatcher\GenericEvent;
@@ -66,7 +73,14 @@ use Symfony\Component\EventDispatcher\GenericEvent;
 /**
  * Class for user management in a SQL Database (e.g. MySQL, SQLite)
  */
-class Database extends Backend implements IUserBackend {
+class Database extends ABackend
+	implements ICreateUserBackend,
+	           ISetPasswordBackend,
+	           ISetDisplayNameBackend,
+	           IGetDisplayNameBackend,
+	           ICheckPasswordBackend,
+	           IGetHomeBackend,
+	           ICountUsersBackend {
 	/** @var CappedMemoryCache */
 	private $cache;
 
@@ -93,13 +107,13 @@ class Database extends Backend implements IUserBackend {
 	 * Creates a new user. Basic checking of username is done in OC_User
 	 * itself, not in its subclasses.
 	 */
-	public function createUser($uid, $password) {
+	public function createUser(string $uid, string $password): bool {
 		if (!$this->userExists($uid)) {
 			$event = new GenericEvent($password);
 			$this->eventDispatcher->dispatch('OCP\PasswordPolicy::validate', $event);
 			$query = \OC_DB::prepare('INSERT INTO `*PREFIX*users` ( `uid`, `password` ) VALUES( ?, ? )');
 			try {
-				$result = $query->execute(array($uid, \OC::$server->getHasher()->hash($password)));
+				$result = $query->execute([$uid, \OC::$server->getHasher()->hash($password)]);
 			} catch (\Exception $e) {
 				$result = false;
 			}
@@ -124,7 +138,7 @@ class Database extends Backend implements IUserBackend {
 	public function deleteUser($uid) {
 		// Delete user-group-relation
 		$query = \OC_DB::prepare('DELETE FROM `*PREFIX*users` WHERE `uid` = ?');
-		$result = $query->execute(array($uid));
+		$result = $query->execute([$uid]);
 
 		if (isset($this->cache[$uid])) {
 			unset($this->cache[$uid]);
@@ -142,12 +156,12 @@ class Database extends Backend implements IUserBackend {
 	 *
 	 * Change the password of a user
 	 */
-	public function setPassword($uid, $password) {
+	public function setPassword(string $uid, string $password): bool {
 		if ($this->userExists($uid)) {
 			$event = new GenericEvent($password);
 			$this->eventDispatcher->dispatch('OCP\PasswordPolicy::validate', $event);
 			$query = \OC_DB::prepare('UPDATE `*PREFIX*users` SET `password` = ? WHERE `uid` = ?');
-			$result = $query->execute(array(\OC::$server->getHasher()->hash($password), $uid));
+			$result = $query->execute([\OC::$server->getHasher()->hash($password), $uid]);
 
 			return $result ? true : false;
 		}
@@ -164,10 +178,10 @@ class Database extends Backend implements IUserBackend {
 	 *
 	 * Change the display name of a user
 	 */
-	public function setDisplayName($uid, $displayName) {
+	public function setDisplayName(string $uid, string $displayName): bool {
 		if ($this->userExists($uid)) {
 			$query = \OC_DB::prepare('UPDATE `*PREFIX*users` SET `displayname` = ? WHERE LOWER(`uid`) = LOWER(?)');
-			$query->execute(array($displayName, $uid));
+			$query->execute([$displayName, $uid]);
 			$this->cache[$uid]['displayname'] = $displayName;
 
 			return true;
@@ -182,7 +196,7 @@ class Database extends Backend implements IUserBackend {
 	 * @param string $uid user ID of the user
 	 * @return string display name
 	 */
-	public function getDisplayName($uid) {
+	public function getDisplayName($uid): string {
 		$this->loadUser($uid);
 		return empty($this->cache[$uid]['displayname']) ? $uid : $this->cache[$uid]['displayname'];
 	}
@@ -235,9 +249,9 @@ class Database extends Backend implements IUserBackend {
 	 * Check if the password is correct without logging in the user
 	 * returns the user id or false
 	 */
-	public function checkPassword($uid, $password) {
+	public function checkPassword(string $uid, string $password) {
 		$query = \OC_DB::prepare('SELECT `uid`, `password` FROM `*PREFIX*users` WHERE LOWER(`uid`) = LOWER(?)');
-		$result = $query->execute(array($uid));
+		$result = $query->execute([$uid]);
 
 		$row = $result->fetchRow();
 		if ($row) {
@@ -271,7 +285,7 @@ class Database extends Backend implements IUserBackend {
 			}
 
 			$query = \OC_DB::prepare('SELECT `uid`, `displayname` FROM `*PREFIX*users` WHERE LOWER(`uid`) = LOWER(?)');
-			$result = $query->execute(array($uid));
+			$result = $query->execute([$uid]);
 
 			if ($result === false) {
 				Util::writeLog('core', \OC_DB::getErrorMessage(), Util::ERROR);
@@ -326,9 +340,9 @@ class Database extends Backend implements IUserBackend {
 	 * @param string $uid the username
 	 * @return string|false
 	 */
-	public function getHome($uid) {
+	public function getHome(string $uid) {
 		if ($this->userExists($uid)) {
-			return \OC::$server->getConfig()->getSystemValue("datadirectory", \OC::$SERVERROOT . "/data") . '/' . $uid;
+			return \OC::$server->getConfig()->getSystemValue('datadirectory', \OC::$SERVERROOT . '/data') . '/' . $uid;
 		}
 
 		return false;
diff --git a/lib/public/User/Backend/ABackend.php b/lib/public/User/Backend/ABackend.php
new file mode 100644
index 00000000000..a110ba5202a
--- /dev/null
+++ b/lib/public/User/Backend/ABackend.php
@@ -0,0 +1,72 @@
+<?php
+declare(strict_types=1);
+/**
+* @copyright Copyright (c) 2018 Roeland Jago Douma <roeland@famdouma.nl>
+*
+* @author Roeland Jago Douma <roeland@famdouma.nl>
+*
+* @license GNU AGPL version 3 or any later version
+*
+* This program is free software: you can redistribute it and/or modify
+* it under the terms of the GNU Affero General Public License as
+* published by the Free Software Foundation, either version 3 of the
+* License, or (at your option) any later version.
+*
+* 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
+* along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*
+*/
+
+namespace OCP\User\Backend;
+
+use OC\User\Backend;
+use OCP\IUserBackend;
+use OCP\UserInterface;
+
+/**
+ * @since 14.0.0
+ */
+abstract class ABackend implements IUserBackend, UserInterface {
+
+	/**
+	 * @deprecated 14.0.0
+	 *
+	 * @param int $actions The action to check for
+	 * @return bool
+	 */
+	public function implementsActions($actions): bool {
+		$implements = 0;
+
+		if ($this instanceof ICreateUserBackend) {
+			$implements |= Backend::CREATE_USER;
+		}
+		if ($this instanceof ISetPasswordBackend) {
+			$implements |= Backend::SET_PASSWORD;
+		}
+		if ($this instanceof ICheckPasswordBackend) {
+			$implements |= Backend::CHECK_PASSWORD;
+		}
+		if ($this instanceof IGetHomeBackend) {
+			$implements |= Backend::GET_HOME;
+		}
+		if ($this instanceof IGetDisplayNameBackend) {
+			$implements |= Backend::GET_DISPLAYNAME;
+		}
+		if ($this instanceof ISetDisplayNameBackend) {
+			$implements |= Backend::SET_DISPLAYNAME;
+		}
+		if ($this instanceof IProvideAvatarBackend) {
+			$implements |= Backend::PROVIDE_AVATAR;
+		}
+		if ($this instanceof ICountUsersBackend) {
+			$implements |= Backend::COUNT_USERS;
+		}
+
+		return (bool)($actions & $implements);
+	}
+}
diff --git a/lib/public/User/Backend/ICheckPasswordBackend.php b/lib/public/User/Backend/ICheckPasswordBackend.php
new file mode 100644
index 00000000000..b28c94f1a6c
--- /dev/null
+++ b/lib/public/User/Backend/ICheckPasswordBackend.php
@@ -0,0 +1,39 @@
+<?php
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2018 Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCP\User\Backend;
+
+/**
+ * @since 14.0.0
+ */
+interface ICheckPasswordBackend {
+	/**
+	 * @since 14.0.0
+	 *
+	 * @param string $uid The username
+	 * @param string $password The password
+	 * @return string|bool The uid on success false on failure
+	 */
+	public function checkPassword(string $loginName, string $password);
+}
diff --git a/lib/public/User/Backend/ICountUsersBackend.php b/lib/public/User/Backend/ICountUsersBackend.php
new file mode 100644
index 00000000000..1cb46712aa0
--- /dev/null
+++ b/lib/public/User/Backend/ICountUsersBackend.php
@@ -0,0 +1,38 @@
+<?php
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2018 Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCP\User\Backend;
+
+/**
+ * @since 14.0.0
+ */
+interface ICountUsersBackend {
+
+	/**
+	 * @since 14.0.0
+	 *
+	 * @return int|bool The number of users on success false on failure
+	 */
+	public function countUsers();
+}
diff --git a/lib/public/User/Backend/ICreateUserBackend.php b/lib/public/User/Backend/ICreateUserBackend.php
new file mode 100644
index 00000000000..09a20e12453
--- /dev/null
+++ b/lib/public/User/Backend/ICreateUserBackend.php
@@ -0,0 +1,40 @@
+<?php
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2018 Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCP\User\Backend;
+
+/**
+ * @since 14.0.0
+ */
+interface ICreateUserBackend {
+
+	/**
+	 * @since 14.0.0
+	 *
+	 * @param string $uid The username of the user to create
+	 * @param string $password The password of the new user
+	 * @return bool
+	 */
+	public function createUser(string $uid, string $password): bool;
+}
diff --git a/lib/public/User/Backend/IGetDisplayNameBackend.php b/lib/public/User/Backend/IGetDisplayNameBackend.php
new file mode 100644
index 00000000000..6382ddd6eb6
--- /dev/null
+++ b/lib/public/User/Backend/IGetDisplayNameBackend.php
@@ -0,0 +1,39 @@
+<?php
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2018 Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCP\User\Backend;
+
+/**
+ * @since 14.0.0
+ */
+interface IGetDisplayNameBackend {
+
+	/**
+	 * @since 14.0.0
+	 *
+	 * @param string $uid user ID of the user
+	 * @return string display name
+	 */
+	public function getDisplayName($uid): string;
+}
diff --git a/lib/public/User/Backend/IGetHomeBackend.php b/lib/public/User/Backend/IGetHomeBackend.php
new file mode 100644
index 00000000000..20fcd004bba
--- /dev/null
+++ b/lib/public/User/Backend/IGetHomeBackend.php
@@ -0,0 +1,39 @@
+<?php
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2018 Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCP\User\Backend;
+
+/**
+ * @since 14.0.0
+ */
+interface IGetHomeBackend {
+
+	/**
+	 * @since 14.0.0
+	 *
+	 * @param string $uid the username
+	 * @return string|bool Datadir on success false on failure
+	 */
+	public function getHome(string $uid);
+}
diff --git a/lib/public/User/Backend/IProvideAvatarBackend.php b/lib/public/User/Backend/IProvideAvatarBackend.php
new file mode 100644
index 00000000000..328c7450b40
--- /dev/null
+++ b/lib/public/User/Backend/IProvideAvatarBackend.php
@@ -0,0 +1,39 @@
+<?php
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2018 Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCP\User\Backend;
+
+/**
+ * @since 14.0.0
+ */
+interface IProvideAvatarBackend {
+
+	/**
+	 * @since 14.0.0
+	 *
+	 * @param string $uid
+	 * @return bool
+	 */
+	public function canChangeAvatar(string $uid): bool;
+}
diff --git a/lib/public/User/Backend/ISetDisplayNameBackend.php b/lib/public/User/Backend/ISetDisplayNameBackend.php
new file mode 100644
index 00000000000..ac41cd3e2c3
--- /dev/null
+++ b/lib/public/User/Backend/ISetDisplayNameBackend.php
@@ -0,0 +1,40 @@
+<?php
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2018 Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCP\User\Backend;
+
+/**
+ * @since 14.0.0
+ */
+interface ISetDisplayNameBackend {
+
+	/**
+	 * @since 14.0.0
+	 *
+	 * @param string $uid The username
+	 * @param string $displayName The new display name
+	 * @return bool
+	 */
+	public function setDisplayName(string $uid, string $displayName): bool;
+}
diff --git a/lib/public/User/Backend/ISetPasswordBackend.php b/lib/public/User/Backend/ISetPasswordBackend.php
new file mode 100644
index 00000000000..687ac5f70bb
--- /dev/null
+++ b/lib/public/User/Backend/ISetPasswordBackend.php
@@ -0,0 +1,40 @@
+<?php
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2018 Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCP\User\Backend;
+
+/**
+ * @since 14.0.0
+ */
+interface ISetPasswordBackend {
+
+	/**
+	 * @since 14.0.0
+	 *
+	 * @param string $uid The username
+	 * @param string $password The new password
+	 * @return bool
+	 */
+	public function setPassword(string $uid, string $password): bool;
+}
diff --git a/lib/public/UserInterface.php b/lib/public/UserInterface.php
index 61136783b3c..b82fc6ba550 100644
--- a/lib/public/UserInterface.php
+++ b/lib/public/UserInterface.php
@@ -48,6 +48,7 @@ interface UserInterface {
 	 * Returns the supported actions as int to be
 	 * compared with \OC\User\Backend::CREATE_USER etc.
 	 * @since 4.5.0
+	 * @deprecated 14.0.0 Switch to the interfaces from OCP\User\Backend
 	 */
 	public function implementsActions($actions);