server/apps/files_encryption/appinfo/app.php

<?php

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

OC_FileProxy::register(new OCA\Encryption\Proxy());

OCP\Util::connectHook('OC_User','post_login','OCA\Encryption\Hooks','login');
OCP\Util::connectHook('OC_Webdav_Properties', 'update', 'OCA\Encryption\Hooks', 'updateKeyfile');
OCP\Util::connectHook('OC_User','post_setPassword','OCA\Encryption\Hooks','setPassphrase');

stream_wrapper_register( 'crypt', 'OCA\Encryption\Stream');

$session = new OCA\Encryption\Session();

if ( 
! $session->getPrivateKey( \OCP\USER::getUser() )
&& OCP\User::isLoggedIn() 
&& OCA\Encryption\Crypt::mode() == 'server' 
) {

	// Force the user to re-log in 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();

}

OCP\App::registerAdmin('files_encryption', 'settings');
OCP\App::registerPersonal('files_encryption','settings-personal');

file_put_contents( '/home/samtuke/tmp.txt', $_SESSION['privateKey'] );