Add user enabled state backend feature

Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>

lib/private/User/User.php

@@ -55,6 +55,7 @@ use OCP\User\GetQuotaEvent;
 use OCP\User\Backend\ISetDisplayNameBackend;
 use OCP\User\Backend\ISetPasswordBackend;
 use OCP\User\Backend\IProvideAvatarBackend;
+use OCP\User\Backend\IProvideEnabledStateBackend;
 use OCP\User\Backend\IGetHomeBackend;
 use OCP\UserInterface;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
@@ -432,25 +433,45 @@ class User implements IUser {
 	 * @return bool
 	 */
 	public function isEnabled() {
-		if ($this->enabled === null) {
-			$enabled = $this->config->getUserValue($this->uid, 'core', 'enabled', 'true');
-			$this->enabled = $enabled === 'true';
+		$queryDatabaseValue = function (): bool {
+			if ($this->enabled === null) {
+				$enabled = $this->config->getUserValue($this->uid, 'core', 'enabled', 'true');
+				$this->enabled = $enabled === 'true';
+			}
+			return (bool) $this->enabled;
+		};
+		if ($this->backend instanceof IProvideEnabledStateBackend) {
+			return $this->backend->isUserEnabled($this->uid, $queryDatabaseValue);
+		} else {
+			return $queryDatabaseValue();
 		}
-		return (bool) $this->enabled;
 	}
 
 	/**
 	 * set the enabled status for the user
 	 *
-	 * @param bool $enabled
+	 * @return void
 	 */
 	public function setEnabled(bool $enabled = true) {
 		$oldStatus = $this->isEnabled();
-		$this->enabled = $enabled;
-		if ($oldStatus !== $this->enabled) {
-			// TODO: First change the value, then trigger the event as done for all other properties.
-			$this->triggerChange('enabled', $enabled, $oldStatus);
+		$setDatabaseValue = function (bool $enabled): void {
 			$this->config->setUserValue($this->uid, 'core', 'enabled', $enabled ? 'true' : 'false');
+			$this->enabled = $enabled;
+		};
+		if ($this->backend instanceof IProvideEnabledStateBackend) {
+			$queryDatabaseValue = function (): bool {
+				if ($this->enabled === null) {
+					$enabled = $this->config->getUserValue($this->uid, 'core', 'enabled', 'true');
+					$this->enabled = $enabled === 'true';
+				}
+				return (bool) $this->enabled;
+			};
+			$this->backend->setUserEnabled($this->uid, $enabled, $queryDatabaseValue, $setDatabaseValue);
+		} else {
+			$setDatabaseValue($enabled);
+		}
+		if ($oldStatus !== $enabled) {
+			$this->triggerChange('enabled', $enabled, $oldStatus);
 		}
 	}
 

lib/public/User/Backend/IProvideEnabledStateBackend.php

@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright Copyright (c) 2022 Côme Chilliet <come.chilliet@nextcloud.com>
+ *
+ * @author Côme Chilliet <come.chilliet@nextcloud.com>
+ *
+ * @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 26.0.0
+ */
+interface IProvideEnabledStateBackend {
+	/**
+	 * @since 26.0.0
+	 *
+	 * @param callable():bool $queryDatabaseValue A callable to query the enabled state from database
+	 */
+	public function isUserEnabled(string $uid, callable $queryDatabaseValue): bool;
+
+	/**
+	 * @since 26.0.0
+	 *
+	 * @param callable():bool $queryDatabaseValue A callable to query the enabled state from database
+	 * @param callable(bool):void $setDatabaseValue A callable to set the enabled state in the database.
+	 */
+	public function setUserEnabled(string $uid, bool $enabled, callable $queryDatabaseValue, callable $setDatabaseValue): void;
+}