<?php
  
  /**
   * Copyright (c) 2013, Bjoern Schiessle <schiessle@owncloud.com>
   * This file is licensed under the Affero General Public License version 3 or later.
   * See the COPYING-README file.
   *

   * Script to change recovery key password

   *
   */
  
  use OCA\Encryption;
  
  \OCP\JSON::checkAdminUser();
  \OCP\JSON::checkAppEnabled('files_encryption');
  \OCP\JSON::callCheck();
  
  $l = OC_L10N::get('core');
  
  $return = false;
  
  $oldPassword = $_POST['oldPassword'];
  $newPassword = $_POST['newPassword'];
  
  $view = new \OC\Files\View('/');

  $util = new \OCA\Encryption\Util(new \OC\Files\View('/'), \OCP\User::getUser());

  
  $proxyStatus = \OC_FileProxy::$enabled;
  \OC_FileProxy::$enabled = false;
  
  $keyId = $util->getRecoveryKeyId();
  $keyPath = '/owncloud_private_key/' . $keyId . '.private.key';
  
  $encryptedRecoveryKey = $view->file_get_contents($keyPath);
  $decryptedRecoveryKey = \OCA\Encryption\Crypt::decryptPrivateKey($encryptedRecoveryKey, $oldPassword);
  
  if ($decryptedRecoveryKey) {

  	$cipher = \OCA\Encryption\Helper::getCipher();
  	$encryptedKey = \OCA\Encryption\Crypt::symmetricEncryptFileContent($decryptedRecoveryKey, $newPassword, $cipher);
  	if ($encryptedKey) {
  		\OCA\Encryption\Keymanager::setPrivateSystemKey($encryptedKey, $keyId . '.private.key');
  		$return = true;
  	}

  }
  
  \OC_FileProxy::$enabled = $proxyStatus;
  
  // success or failure
  if ($return) {
  	\OCP\JSON::success(array('data' => array('message' => $l->t('Password successfully changed.'))));
  } else {
  	\OCP\JSON::error(array('data' => array('message' => $l->t('Could not change the password. Maybe the old password was not correct.'))));

  }