nextcloud/apps/files_encryption/appinfo/app.php

<?php

OC::$CLASSPATH['OCA\Encryption\Crypt'] = 'files_encryption/lib/crypt.php';
OC::$CLASSPATH['OCA\Encryption\Hooks'] = 'files_encryption/hooks/hooks.php';
OC::$CLASSPATH['OCA\Encryption\Util'] = 'files_encryption/lib/util.php';
OC::$CLASSPATH['OCA\Encryption\Keymanager'] = 'files_encryption/lib/keymanager.php';
OC::$CLASSPATH['OCA\Encryption\Stream'] = 'files_encryption/lib/stream.php';
OC::$CLASSPATH['OCA\Encryption\Proxy'] = 'files_encryption/lib/proxy.php';
OC::$CLASSPATH['OCA\Encryption\Session'] = 'files_encryption/lib/session.php';
OC::$CLASSPATH['OCA\Encryption\Capabilities'] = 'files_encryption/lib/capabilities.php';
OC::$CLASSPATH['OCA\Encryption\Helper'] = 'files_encryption/lib/helper.php';

if (!OC_Config::getValue('maintenance', false)) {
	OC_FileProxy::register(new OCA\Encryption\Proxy());

	// User related hooks
	OCA\Encryption\Helper::registerUserHooks();

	// Sharing related hooks
	OCA\Encryption\Helper::registerShareHooks();

	// Filesystem related hooks
	OCA\Encryption\Helper::registerFilesystemHooks();

	// App manager related hooks
	OCA\Encryption\Helper::registerAppHooks();

	if(!in_array('crypt', stream_get_wrappers())) {
		stream_wrapper_register('crypt', 'OCA\Encryption\Stream');
	}

	// check if we are logged in
	if (OCP\User::isLoggedIn()) {

		// ensure filesystem is loaded
		if (!\OC\Files\Filesystem::$loaded) {
			\OC_Util::setupFS();
		}

		$view = new OC_FilesystemView('/');

		$sessionReady = OCA\Encryption\Helper::checkRequirements();
		if($sessionReady) {
			$session = new \OCA\Encryption\Session($view);
		}

		$user = \OCP\USER::getUser();
		// check if user has a private key
		if ($sessionReady === false
			|| (!$view->file_exists('/' . $user . '/files_encryption/' . $user . '.private.key')
				&& OCA\Encryption\Crypt::mode() === 'server')
		) {

			// Force the user to log-in again if the encryption key isn't unlocked
			// (happens when a user is logged in before the encryption app is
			// enabled)
			OCP\User::logout();

			header("Location: " . OC::$WEBROOT . '/');

			exit();
		}
	}
} else {
	// logout user if we are in maintenance to force re-login
	OCP\User::logout();
}

// Register settings scripts
OCP\App::registerAdmin('files_encryption', 'settings-admin');
OCP\App::registerPersonal('files_encryption', 'settings-personal');