<?php
/***
 * ownCloud
 *
 * @author Bjoern Schiessle
 * @copyright 2012 Bjoern Schiessle <schiessle@owncloud.com>
 *
 * 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;

/**
 * This class provides basic operations to read/write encryption keys from/to the filesystem 
 */
class Keymanager {
	
	
	/**
	 * @brief retrieve private key from a user
	 * 
	 * @param string user name
	 * @return string private key or false
	 */
	public static function getPrivateKey( $user ) {

		$view = new \OC_FilesystemView( '/' . $user . '/' . 'files_encryption' . '/' );
		
		return $view->file_get_contents( $user.'.private.key' );
	}
	
	/**
	 * @brief retrieve public key from a user
	 *
	 * @param string user name
	 * @return string private key or false
	 */
	public static function getPublicKey($user) {
		$publicKeyStorage =  \OCP\Config::getSystemValue('datadirectory').'/public-keys/';
		$view = $view = new \OC_FilesystemView($publicKeyStorage);
		return $view->file_get_contents($user.'.public.key');
	}
	
	/**
	 * @brief retrieve file encryption key
	 *
	 * @param string file name
	 * @param string user name of the file owner
	 * @return string file key or false
	 */
	public static function getFileKey($user, $file) {
		$fileKeyStorage =  \OCP\Config::getSystemValue('datadirectory').'/'.$user.'/files_encryption/keyfiles/';
		$view = new \OC_FilesystemView($fileKeyStorage);
		return $view->file_get_contents($file.'.key');
	}	
	
	/**
	 * @brief store private key from a user
	 *
	 * @param string user name
	 * @param string key
	 * @return bool true/false
	 */
	public static function setPrivateKey($user, $key) {
		$privateKeyStorage =  \OCP\Config::getSystemValue('datadirectory').'/'.$user.'/files_encryption/';
		$view = new \OC_FilesystemView($privateKeyStorage);
		return $view->file_put_contents($user.'.private.key', $key);
	}
	
	
	/**
	 * @brief store public key from a user
	 *
	 * @param string user name
	 * @param string key
	 * @return bool true/false
	 */
	public static function setPublicKey($user, $key) {
		$publicKeyStorage =  \OCP\Config::getSystemValue('datadirectory').'/public-keys/';
		$view = new \OC_FilesystemView($publicKeyStorage);
		return $view->file_put_contents($user.'.public.key', $key);
	}
	
	/**
	 * @brief store file encryption key
	 *
	 * @param string user name of the file owner
	 * @param string file name
	 * @param string key
	 * @return bool true/false
	 */
	public static function setFileKey($user, $file, $key) {
		$fileKeyStorage =  \OCP\Config::getSystemValue('datadirectory').'/'.$user.'/files_encryption/keyfiles/';
		$view = new \OC_FilesystemView($fileKeyStorage);
		return $view->file_put_contents($file.'.key', $key);
	
	}
	
}