Delete matches when the user is being deleted

Signed-off-by: Joas Schilling <coding@schilljs.com>

apps/provisioning_api/composer/composer/autoload_classmap.php

@@ -14,6 +14,7 @@ return array(
     'OCA\\Provisioning_API\\Controller\\GroupsController' => $baseDir . '/../lib/Controller/GroupsController.php',
     'OCA\\Provisioning_API\\Controller\\UsersController' => $baseDir . '/../lib/Controller/UsersController.php',
     'OCA\\Provisioning_API\\FederatedShareProviderFactory' => $baseDir . '/../lib/FederatedShareProviderFactory.php',
+    'OCA\\Provisioning_API\\Listener\\UserDeletedListener' => $baseDir . '/../lib/Listener/UserDeletedListener.php',
     'OCA\\Provisioning_API\\Middleware\\Exceptions\\NotSubAdminException' => $baseDir . '/../lib/Middleware/Exceptions/NotSubAdminException.php',
     'OCA\\Provisioning_API\\Middleware\\ProvisioningApiMiddleware' => $baseDir . '/../lib/Middleware/ProvisioningApiMiddleware.php',
 );

apps/provisioning_api/composer/composer/autoload_static.php

@@ -29,6 +29,7 @@ class ComposerStaticInitProvisioning_API
         'OCA\\Provisioning_API\\Controller\\GroupsController' => __DIR__ . '/..' . '/../lib/Controller/GroupsController.php',
         'OCA\\Provisioning_API\\Controller\\UsersController' => __DIR__ . '/..' . '/../lib/Controller/UsersController.php',
         'OCA\\Provisioning_API\\FederatedShareProviderFactory' => __DIR__ . '/..' . '/../lib/FederatedShareProviderFactory.php',
+        'OCA\\Provisioning_API\\Listener\\UserDeletedListener' => __DIR__ . '/..' . '/../lib/Listener/UserDeletedListener.php',
         'OCA\\Provisioning_API\\Middleware\\Exceptions\\NotSubAdminException' => __DIR__ . '/..' . '/../lib/Middleware/Exceptions/NotSubAdminException.php',
         'OCA\\Provisioning_API\\Middleware\\ProvisioningApiMiddleware' => __DIR__ . '/..' . '/../lib/Middleware/ProvisioningApiMiddleware.php',
     );

apps/provisioning_api/lib/AppInfo/Application.php

@@ -29,6 +29,7 @@
 namespace OCA\Provisioning_API\AppInfo;
 
 use OC\Group\Manager as GroupManager;
+use OCA\Provisioning_API\Listener\UserDeletedListener;
 use OCA\Provisioning_API\Middleware\ProvisioningApiMiddleware;
 use OCA\Settings\Mailer\NewUserMailHelper;
 use OCP\AppFramework\App;
@@ -47,6 +48,7 @@ use OCP\L10N\IFactory;
 use OCP\Mail\IMailer;
 use OCP\Security\ICrypto;
 use OCP\Security\ISecureRandom;
+use OCP\User\Events\UserDeletedEvent;
 use OCP\Util;
 use Psr\Container\ContainerInterface;
 
@@ -56,6 +58,8 @@ class Application extends App implements IBootstrap {
 	}
 
 	public function register(IRegistrationContext $context): void {
+		$context->registerEventListener(UserDeletedEvent::class, UserDeletedListener::class);
+
 		$context->registerService(NewUserMailHelper::class, function (ContainerInterface $c) {
 			return new NewUserMailHelper(
 				$c->get(Defaults::class),

apps/provisioning_api/lib/Listener/UserDeletedListener.php

@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2020 Joas Schilling <coding@schilljs.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 OCA\Provisioning_API\Listener;
+
+use OC\KnownUser\KnownUserMapper;
+use OCP\EventDispatcher\Event;
+use OCP\EventDispatcher\IEventListener;
+use OCP\User\Events\UserDeletedEvent;
+
+class UserDeletedListener implements IEventListener {
+
+	/** @var KnownUserMapper */
+	private $knownUserMapper;
+
+	public function __construct(KnownUserMapper $knownUserMapper) {
+		$this->knownUserMapper = $knownUserMapper;
+	}
+
+	public function handle(Event $event): void {
+		if (!($event instanceof UserDeletedEvent)) {
+			// Unrelated
+			return;
+		}
+
+		$user = $event->getUser();
+
+		// Delete all entries of this user
+		$this->knownUserMapper->deleteKnownTo($user->getUID());
+
+		// Delete all entries that other users know this user
+		$this->knownUserMapper->deleteKnownUser($user->getUID());
+	}
+}