server/lib/private/Files/SimpleFS/SimpleFile.php
Roeland Jago Douma 8b5997483c
Hardening of SimpleFile getContent
if file_get_contents fails remove the file. And traverse up the tree
checking if the other folders are there.

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>
2018-02-27 13:35:09 +01:00

149 lines
3 KiB
PHP

<?php
/**
* @copyright 2016 Roeland Jago Douma <roeland@famdouma.nl>
*
* @author Roeland Jago Douma <roeland@famdouma.nl>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program 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 program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OC\Files\SimpleFS;
use OCP\Files\File;
use OCP\Files\NotFoundException;
use OCP\Files\NotPermittedException;
use OCP\Files\SimpleFS\ISimpleFile;
class SimpleFile implements ISimpleFile {
/** @var File $file */
private $file;
/**
* File constructor.
*
* @param File $file
*/
public function __construct(File $file) {
$this->file = $file;
}
/**
* Get the name
*
* @return string
*/
public function getName() {
return $this->file->getName();
}
/**
* Get the size in bytes
*
* @return int
*/
public function getSize() {
return $this->file->getSize();
}
/**
* Get the ETag
*
* @return string
*/
public function getETag() {
return $this->file->getEtag();
}
/**
* Get the last modification time
*
* @return int
*/
public function getMTime() {
return $this->file->getMTime();
}
/**
* Get the content
*
* @throws NotPermittedException
* @throws NotFoundException
* @return string
*/
public function getContent() {
$result = $this->file->getContent();
if ($result === false) {
$this->checkFile();
}
return $result;
}
/**
* Overwrite the file
*
* @param string $data
* @throws NotPermittedException
*/
public function putContent($data) {
$this->file->putContent($data);
}
/**
* Sometimes there are some issues with the AppData. Most of them are from
* user error. But we should handle them gracefull anyway.
*
* If for some reason the current file can't be found. We remove it.
* Then traverse up and check all folders if they exists. This so that the
* next request will have a valid appdata structure again.
*
* @throws NotFoundException
*/
private function checkFile() {
$cur = $this->file;
while ($cur->stat() === false) {
$parent = $cur->getParent();
$cur->delete();
$cur = $parent;
}
if ($cur !== $this->file) {
throw new NotFoundException('File does not exist');
}
}
/**
* Delete the file
*
* @throws NotPermittedException
*/
public function delete() {
$this->file->delete();
}
/**
* Get the MimeType
*
* @return string
*/
public function getMimeType() {
return $this->file->getMimeType();
}
}