2 files changed, 90 insertions, 1 deletions

diff --git a/lib/private/Config/PresetManager.php b/lib/private/Config/PresetManager.php
index b45d41b06f8..b8418673157 100644
--- a/lib/private/Config/PresetManager.php
+++ b/lib/private/Config/PresetManager.php
@@ -8,22 +8,32 @@ declare(strict_types=1);
 
 namespace OC\Config;
 
+use OC\App\AppManager;
+use OC\Installer;
+use OCP\App\AppPathNotFoundException;
+use OCP\App\IAppManager;
 use OCP\Config\Lexicon\Preset;
 use OCP\IConfig;
+use OCP\Server;
+use Psr\Log\LoggerInterface;
 
 /**
- * tools to maintains configurations
+ * tools to manage the Preset feature
  *
  * @since 32.0.0
  */
 class PresetManager {
 	private const PRESET_CONFIGKEY = 'config_preset';
 
+	private ?AppManager $appManager = null;
+	private ?Installer $installer = null;
+
 	private ?Preset $configLexiconPreset = null;
 
 	public function __construct(
 		private readonly IConfig $config,
 		private readonly ConfigManager $configManager,
+		private readonly LoggerInterface $logger,
 	) {
 	}
 
@@ -35,6 +45,7 @@ class PresetManager {
 		$this->config->setSystemValue(self::PRESET_CONFIGKEY, $preset->value);
 		$this->configLexiconPreset = $preset;
 		$this->configManager->clearConfigCaches();
+		$this->refreshPresetApps();
 	}
 
 	/**
@@ -47,4 +58,79 @@ class PresetManager {
 
 		return $this->configLexiconPreset;
 	}
+
+	/**
+	 * Enable and/or Disable a list of apps based on the currently selected Preset
+	 */
+	public function refreshPresetApps(): void {
+		$this->loadAppManager();
+
+		$apps = $this->getPresetApps($this->getLexiconPreset());
+		foreach ($apps['disabled'] ?? [] as $app) {
+			try {
+				$this->appManager->disableApp($app);
+			} catch (\Exception $e) {
+				$this->logger->warning('could not disable app', ['exception' => $e]);
+			}
+		}
+
+		foreach ($apps['enabled'] ?? [] as $app) {
+			$this->installApp($app);
+		}
+	}
+
+	/**
+	 * some parts cannot be initiated at __construct() time
+	 */
+	private function loadAppManager(): void {
+		if ($this->appManager === null) {
+			$this->appManager = Server::get(IAppManager::class);
+		}
+		if ($this->installer === null) {
+			$this->installer = Server::get(Installer::class);
+		}
+	}
+
+	/**
+	 * download, install and enable app.
+	 * generate warning entry in logs in case of failure.
+	 */
+	private function installApp(string $appId): void {
+		$this->loadAppManager();
+		if (!$this->installer->isDownloaded($appId)) {
+			try {
+				$this->installer->downloadApp($appId);
+			} catch (\Exception $e) {
+				$this->logger->warning('could not download app', ['appId' => $appId, 'exception' => $e]);
+				return;
+			}
+		}
+
+		try {
+			$this->installer->installApp($appId, true);
+		} catch (\Exception $e) {
+			$this->logger->warning('could not install app', ['appId' => $appId, 'exception' => $e]);
+			return;
+		}
+
+		try {
+			$this->appManager->enableApp($appId);
+		} catch (AppPathNotFoundException $e) {
+			$this->logger->warning('could not enable app', ['appId' => $appId, 'exception' => $e]);
+			return;
+		}
+	}
+
+	/**
+	 * get listing of enabled/disabled app from Preset
+	 *
+	 * @return array{enabled: list<string>, disabled: list<string>}
+	 */
+	private function getPresetApps(Preset $preset): array {
+		return match ($preset) {
+			Preset::CLUB, Preset::FAMILY, Preset::SCHOOL, Preset::UNIVERSITY, Preset::SMALL, Preset::MEDIUM, Preset::LARGE => ['enabled' => ['intros', 'guests'], 'disabled' => []],
+			Preset::SHARED => ['enabled' => ['intros', 'external'], 'disabled' => []],
+			default => ['enabled' => [], 'disabled' => []],
+		};
+	}
 }
diff --git a/tests/lib/Config/LexiconTest.php b/tests/lib/Config/LexiconTest.php
index d7e9b12a1cf..3f14721dd6e 100644
--- a/tests/lib/Config/LexiconTest.php
+++ b/tests/lib/Config/LexiconTest.php
@@ -11,6 +11,7 @@ use OC\AppConfig;
 use OC\AppFramework\Bootstrap\Coordinator;
 use OC\Config\ConfigManager;
 use OC\Config\PresetManager;
+use OCP\App\IAppManager;
 use OCP\Config\Exceptions\TypeConflictException;
 use OCP\Config\Exceptions\UnknownKeyException;
 use OCP\Config\IUserConfig;
@@ -34,6 +35,7 @@ class LexiconTest extends TestCase {
 	private IUserConfig $userConfig;
 	private ConfigManager $configManager;
 	private PresetManager $presetManager;
+	private IAppManager $appManager;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -48,6 +50,7 @@ class LexiconTest extends TestCase {
 		$this->userConfig = Server::get(IUserConfig::class);
 		$this->configManager = Server::get(ConfigManager::class);
 		$this->presetManager = Server::get(PresetManager::class);
+		$this->appManager = Server::get(IAppManager::class);
 	}
 
 	protected function tearDown(): void {