nextcloud/apps/files_encryption/hooks/hooks.php

<?php
/**
 * ownCloud
 *
 * @author Sam Tuke
 * @copyright 2012 Sam Tuke samtuke@owncloud.org
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or any later version.
 *
 * This library 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 library.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

namespace OCA_Encryption;

/**
 * Class for hook specific logic
 */

class Hooks {

	# TODO: use passphrase for encrypting private key that is separate to the login password

	/**
	 * @brief Startup encryption backend upon user login
	 * @note This method should never be called for users using client side encryption
	 */

	public static function login( $params ) {

		if ( Crypt::mode( $params['uid'] ) == 'server' ) {

			$view = new \OC_FilesystemView( '/' );

			$util = new Util( $view, $params['uid'] );

			if ( !$util->ready()) {
				
				return $util->setupServerSide( $params['password'] );

			}

			$encryptedKey = Keymanager::getPrivateKey( $params['uid'] );

			$_SESSION['enckey'] = Crypt::symmetricEncryptFileContent( $encryptedKey, $params['password'] );
		}

		return true;

	}

	
	/**
	 * @brief update the encryption key of the file uploaded by the client
	 */
	public static function updateKeyfile( $params ) {
		if (Crypt::mode() == 'client')
			if (isset($params['properties']['key'])) {
				Keymanager::setFileKey($params['path'], $params['properties']['key']);
			} else {
				\OC_Log::write( 'Encryption library', "Client side encryption is enabled but the client doesn't provide a encryption key for the file!", \OC_Log::ERROR );
				error_log("Client side encryption is enabled but the client doesn't provide a encryption key for the file!");
		}
	}
}

?>