315 lines
9.6 KiB
PHP
315 lines
9.6 KiB
PHP
<?php
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/**
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* @author Bart Visscher <bartv@thisnet.nl>
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* @author Björn Schießle <bjoern@schiessle.org>
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* @author Joas Schilling <nickvergessen@owncloud.com>
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* @author Jörn Friedrich Dreyer <jfd@butonic.de>
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* @author Lukas Reschke <lukas@statuscode.ch>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Robin Appelman <icewind@owncloud.com>
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* @author Roeland Jago Douma <rullzer@owncloud.com>
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* @author Vincent Petry <pvince81@owncloud.com>
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*
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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* @license AGPL-3.0
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*
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* This code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License, version 3,
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*/
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namespace OCA\Files_Sharing;
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use OC\Files\Filesystem;
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use OC\Files\View;
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use OCP\Files\NotFoundException;
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use OCP\User;
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class Helper {
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public static function registerHooks() {
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\OCP\Util::connectHook('OC_Filesystem', 'post_rename', '\OCA\Files_Sharing\Updater', 'renameHook');
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\OCP\Util::connectHook('OC_Filesystem', 'post_delete', '\OCA\Files_Sharing\Hooks', 'unshareChildren');
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\OCP\Util::connectHook('OC_Appconfig', 'post_set_value', '\OCA\Files_Sharing\Maintainer', 'configChangeHook');
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\OCP\Util::connectHook('OC_User', 'post_deleteUser', '\OCA\Files_Sharing\Hooks', 'deleteUser');
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}
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/**
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* Sets up the filesystem and user for public sharing
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* @param string $token string share token
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* @param string $relativePath optional path relative to the share
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* @param string $password optional password
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* @return array
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*/
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public static function setupFromToken($token, $relativePath = null, $password = null) {
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\OC_User::setIncognitoMode(true);
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$linkItem = \OCP\Share::getShareByToken($token, !$password);
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if($linkItem === false || ($linkItem['item_type'] !== 'file' && $linkItem['item_type'] !== 'folder')) {
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\OC_Response::setStatus(404);
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\OCP\Util::writeLog('core-preview', 'Passed token parameter is not valid', \OCP\Util::DEBUG);
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exit;
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}
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if(!isset($linkItem['uid_owner']) || !isset($linkItem['file_source'])) {
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\OC_Response::setStatus(500);
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\OCP\Util::writeLog('core-preview', 'Passed token seems to be valid, but it does not contain all necessary information . ("' . $token . '")', \OCP\Util::WARN);
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exit;
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}
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$rootLinkItem = \OCP\Share::resolveReShare($linkItem);
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$path = null;
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if (isset($rootLinkItem['uid_owner'])) {
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\OCP\JSON::checkUserExists($rootLinkItem['uid_owner']);
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\OC_Util::tearDownFS();
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\OC_Util::setupFS($rootLinkItem['uid_owner']);
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}
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try {
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$path = Filesystem::getPath($linkItem['file_source']);
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} catch (NotFoundException $e) {
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\OCP\Util::writeLog('share', 'could not resolve linkItem', \OCP\Util::DEBUG);
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\OC_Response::setStatus(404);
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\OCP\JSON::error(array('success' => false));
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exit();
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}
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if (!isset($linkItem['item_type'])) {
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\OCP\Util::writeLog('share', 'No item type set for share id: ' . $linkItem['id'], \OCP\Util::ERROR);
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\OC_Response::setStatus(404);
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\OCP\JSON::error(array('success' => false));
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exit();
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}
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if (isset($linkItem['share_with']) && (int)$linkItem['share_type'] === \OCP\Share::SHARE_TYPE_LINK) {
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if (!self::authenticate($linkItem, $password)) {
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\OC_Response::setStatus(403);
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\OCP\JSON::error(array('success' => false));
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exit();
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}
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}
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$basePath = $path;
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if ($relativePath !== null && Filesystem::isReadable($basePath . $relativePath)) {
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$path .= Filesystem::normalizePath($relativePath);
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}
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return array(
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'linkItem' => $linkItem,
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'basePath' => $basePath,
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'realPath' => $path
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);
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}
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/**
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* Authenticate link item with the given password
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* or with the session if no password was given.
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* @param array $linkItem link item array
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* @param string $password optional password
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*
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* @return boolean true if authorized, false otherwise
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*/
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public static function authenticate($linkItem, $password = null) {
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if ($password !== null) {
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if ($linkItem['share_type'] == \OCP\Share::SHARE_TYPE_LINK) {
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// Check Password
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$newHash = '';
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if(\OC::$server->getHasher()->verify($password, $linkItem['share_with'], $newHash)) {
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// Save item id in session for future requests
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\OC::$server->getSession()->set('public_link_authenticated', (string) $linkItem['id']);
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/**
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* FIXME: Migrate old hashes to new hash format
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* Due to the fact that there is no reasonable functionality to update the password
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* of an existing share no migration is yet performed there.
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* The only possibility is to update the existing share which will result in a new
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* share ID and is a major hack.
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*
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* In the future the migration should be performed once there is a proper method
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* to update the share's password. (for example `$share->updatePassword($password)`
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*
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* @link https://github.com/owncloud/core/issues/10671
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*/
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if(!empty($newHash)) {
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}
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} else {
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return false;
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}
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} else {
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\OCP\Util::writeLog('share', 'Unknown share type '.$linkItem['share_type']
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.' for share id '.$linkItem['id'], \OCP\Util::ERROR);
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return false;
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}
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}
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else {
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// not authenticated ?
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if ( ! \OC::$server->getSession()->exists('public_link_authenticated')
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|| \OC::$server->getSession()->get('public_link_authenticated') !== (string)$linkItem['id']) {
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return false;
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}
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}
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return true;
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}
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public static function getSharesFromItem($target) {
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$result = array();
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$owner = Filesystem::getOwner($target);
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Filesystem::initMountPoints($owner);
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$info = Filesystem::getFileInfo($target);
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$ownerView = new View('/'.$owner.'/files');
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if ( $owner != User::getUser() ) {
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$path = $ownerView->getPath($info['fileid']);
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} else {
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$path = $target;
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}
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$ids = array();
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while ($path !== dirname($path)) {
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$info = $ownerView->getFileInfo($path);
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if ($info instanceof \OC\Files\FileInfo) {
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$ids[] = $info['fileid'];
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} else {
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\OCP\Util::writeLog('sharing', 'No fileinfo available for: ' . $path, \OCP\Util::WARN);
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}
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$path = dirname($path);
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}
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if (!empty($ids)) {
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$idList = array_chunk($ids, 99, true);
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foreach ($idList as $subList) {
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$statement = "SELECT `share_with`, `share_type`, `file_target` FROM `*PREFIX*share` WHERE `file_source` IN (" . implode(',', $subList) . ") AND `share_type` IN (0, 1, 2)";
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$query = \OCP\DB::prepare($statement);
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$r = $query->execute();
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$result = array_merge($result, $r->fetchAll());
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}
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}
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return $result;
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}
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/**
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* get the UID of the owner of the file and the path to the file relative to
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* owners files folder
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*
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* @param $filename
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* @return array
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* @throws \OC\User\NoUserException
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*/
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public static function getUidAndFilename($filename) {
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$uid = Filesystem::getOwner($filename);
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$userManager = \OC::$server->getUserManager();
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// if the user with the UID doesn't exists, e.g. because the UID points
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// to a remote user with a federated cloud ID we use the current logged-in
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// user. We need a valid local user to create the share
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if (!$userManager->userExists($uid)) {
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$uid = User::getUser();
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}
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Filesystem::initMountPoints($uid);
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if ( $uid != User::getUser() ) {
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$info = Filesystem::getFileInfo($filename);
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$ownerView = new View('/'.$uid.'/files');
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try {
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$filename = $ownerView->getPath($info['fileid']);
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} catch (NotFoundException $e) {
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$filename = null;
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}
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}
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return [$uid, $filename];
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}
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/**
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* Format a path to be relative to the /user/files/ directory
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* @param string $path the absolute path
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* @return string e.g. turns '/admin/files/test.txt' into 'test.txt'
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*/
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public static function stripUserFilesPath($path) {
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$trimmed = ltrim($path, '/');
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$split = explode('/', $trimmed);
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// it is not a file relative to data/user/files
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if (count($split) < 3 || $split[1] !== 'files') {
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return false;
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}
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$sliced = array_slice($split, 2);
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$relPath = implode('/', $sliced);
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return $relPath;
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}
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/**
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* check if file name already exists and generate unique target
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*
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* @param string $path
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* @param array $excludeList
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* @param View $view
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* @return string $path
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*/
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public static function generateUniqueTarget($path, $excludeList, $view) {
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$pathinfo = pathinfo($path);
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$ext = (isset($pathinfo['extension'])) ? '.'.$pathinfo['extension'] : '';
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$name = $pathinfo['filename'];
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$dir = $pathinfo['dirname'];
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$i = 2;
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while ($view->file_exists($path) || in_array($path, $excludeList)) {
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$path = Filesystem::normalizePath($dir . '/' . $name . ' ('.$i.')' . $ext);
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$i++;
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}
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return $path;
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}
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/**
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* get default share folder
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*
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* @param \OC\Files\View
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* @return string
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*/
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public static function getShareFolder($view = null) {
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if ($view === null) {
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$view = Filesystem::getView();
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}
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$shareFolder = \OC::$server->getConfig()->getSystemValue('share_folder', '/');
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$shareFolder = Filesystem::normalizePath($shareFolder);
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if (!$view->file_exists($shareFolder)) {
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$dir = '';
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$subdirs = explode('/', $shareFolder);
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foreach ($subdirs as $subdir) {
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$dir = $dir . '/' . $subdir;
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if (!$view->is_dir($dir)) {
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$view->mkdir($dir);
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}
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}
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}
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return $shareFolder;
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}
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/**
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* set default share folder
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*
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* @param string $shareFolder
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*/
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public static function setShareFolder($shareFolder) {
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\OC::$server->getConfig()->setSystemValue('share_folder', $shareFolder);
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}
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}
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