[stable21] Fix LDAPProviderFactory not found

apps/user_ldap/appinfo/info.xml

@@ -37,6 +37,9 @@ A user logs into Nextcloud with their LDAP or AD credentials, and is granted acc
 		<install>
 			<step>OCA\User_LDAP\Migration\SetDefaultProvider</step>
 		</install>
+		<uninstall>
+			<step>OCA\User_LDAP\Migration\UnsetDefaultProvider</step>
+		</uninstall>
 		<post-migration>
 			<step>OCA\User_LDAP\Migration\UUIDFixInsert</step>
 			<step>OCA\User_LDAP\Migration\RemoveRefreshTime</step>

apps/user_ldap/composer/composer/autoload_classmap.php

@@ -59,6 +59,7 @@
     'OCA\\User_LDAP\\Migration\\UUIDFixGroup' => $baseDir . '/../lib/Migration/UUIDFixGroup.php',
     'OCA\\User_LDAP\\Migration\\UUIDFixInsert' => $baseDir . '/../lib/Migration/UUIDFixInsert.php',
     'OCA\\User_LDAP\\Migration\\UUIDFixUser' => $baseDir . '/../lib/Migration/UUIDFixUser.php',
+    'OCA\\User_LDAP\\Migration\\UnsetDefaultProvider' => $baseDir . '/../lib/Migration/UnsetDefaultProvider.php',
     'OCA\\User_LDAP\\Migration\\Version1010Date20200630192842' => $baseDir . '/../lib/Migration/Version1010Date20200630192842.php',
     'OCA\\User_LDAP\\Migration\\Version1120Date20210917155206' => $baseDir . '/../lib/Migration/Version1120Date20210917155206.php',
     'OCA\\User_LDAP\\Notification\\Notifier' => $baseDir . '/../lib/Notification/Notifier.php',

apps/user_ldap/composer/composer/autoload_static.php

@@ -74,6 +74,7 @@ class ComposerStaticInitUser_LDAP
         'OCA\\User_LDAP\\Migration\\UUIDFixGroup' => __DIR__ . '/..' . '/../lib/Migration/UUIDFixGroup.php',
         'OCA\\User_LDAP\\Migration\\UUIDFixInsert' => __DIR__ . '/..' . '/../lib/Migration/UUIDFixInsert.php',
         'OCA\\User_LDAP\\Migration\\UUIDFixUser' => __DIR__ . '/..' . '/../lib/Migration/UUIDFixUser.php',
+        'OCA\\User_LDAP\\Migration\\UnsetDefaultProvider' => __DIR__ . '/..' . '/../lib/Migration/UnsetDefaultProvider.php',
         'OCA\\User_LDAP\\Migration\\Version1010Date20200630192842' => __DIR__ . '/..' . '/../lib/Migration/Version1010Date20200630192842.php',
         'OCA\\User_LDAP\\Migration\\Version1120Date20210917155206' => __DIR__ . '/..' . '/../lib/Migration/Version1120Date20210917155206.php',
         'OCA\\User_LDAP\\Notification\\Notifier' => __DIR__ . '/..' . '/../lib/Notification/Notifier.php',

apps/user_ldap/lib/Migration/UnsetDefaultProvider.php

@@ -0,0 +1,52 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright 2021 Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @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\User_LDAP\Migration;
+
+use OCA\User_LDAP\LDAPProviderFactory;
+use OCP\IConfig;
+use OCP\Migration\IOutput;
+use OCP\Migration\IRepairStep;
+
+class UnsetDefaultProvider implements IRepairStep {
+
+	/** @var IConfig */
+	private $config;
+
+	public function __construct(IConfig $config) {
+		$this->config = $config;
+	}
+
+	public function getName(): string {
+		return 'Unset default LDAP provider';
+	}
+
+	public function run(IOutput $output): void {
+		$current = $this->config->getSystemValue('ldapProviderFactory', null);
+		if ($current === LDAPProviderFactory::class) {
+			$this->config->deleteSystemValue('ldapProviderFactory');
+		}
+	}
+}

lib/private/Server.php

@@ -1022,7 +1022,7 @@ public function __construct($webRoot, \OC\Config $config) {
 		$this->registerService(ILDAPProviderFactory::class, function (ContainerInterface $c) {
 			$config = $c->get(\OCP\IConfig::class);
 			$factoryClass = $config->getSystemValue('ldapProviderFactory', null);
-			if (is_null($factoryClass)) {
+			if (is_null($factoryClass) || !class_exists($factoryClass)) {
 				return new NullLDAPProviderFactory($this);
 			}
 			/** @var \OCP\LDAP\ILDAPProviderFactory $factory */