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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Joas Schilling <coding@schilljs.com>
* @author Lukas Reschke <lukas@statuscode.ch>
* @author Roeland Jago Douma <roeland@famdouma.nl>
* @author Sebastian Wessalowski <sebastian@wessalowski.org>
* @author Thomas Müller <thomas.mueller@tmit.eu>
* @author Vincent Petry <pvince81@owncloud.com>
*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OC\Cache;
use OC\Files\Filesystem;
use OC\Files\View;
use OCP\ICache;
use OCP\Security\ISecureRandom;
class File implements ICache {
/** @var View */
protected $storage;
/**
* Returns the cache storage for the logged in user
*
* @return \OC\Files\View cache storage
* @throws \OC\ForbiddenException
* @throws \OC\User\NoUserException
*/
protected function getStorage() {
if (isset($this->storage)) {
return $this->storage;
}
if (\OC::$server->getUserSession()->isLoggedIn()) {
$rootView = new View();
$user = \OC::$server->getUserSession()->getUser();
Filesystem::initMountPoints($user->getUID());
if (!$rootView->file_exists('/' . $user->getUID() . '/cache')) {
$rootView->mkdir('/' . $user->getUID() . '/cache');
}
$this->storage = new View('/' . $user->getUID() . '/cache');
return $this->storage;
} else {
\OCP\Util::writeLog('core', 'Can\'t get cache storage, user not logged in', \OCP\Util::ERROR);
throw new \OC\ForbiddenException('Can\t get cache storage, user not logged in');
}
}
/**
* @param string $key
* @return mixed|null
* @throws \OC\ForbiddenException
*/
public function get($key) {
$result = null;
if ($this->hasKey($key)) {
$storage = $this->getStorage();
$result = $storage->file_get_contents($key);
}
return $result;
}
/**
* Returns the size of the stored/cached data
*
* @param string $key
* @return int
*/
public function size($key) {
$result = 0;
if ($this->hasKey($key)) {
$storage = $this->getStorage();
$result = $storage->filesize($key);
}
return $result;
}
/**
* @param string $key
* @param mixed $value
* @param int $ttl
* @return bool|mixed
* @throws \OC\ForbiddenException
*/
public function set($key, $value, $ttl = 0) {
$storage = $this->getStorage();
$result = false;
// unique id to avoid chunk collision, just in case
$uniqueId = \OC::$server->getSecureRandom()->generate(
16,
ISecureRandom::CHAR_DIGITS . ISecureRandom::CHAR_LOWER . ISecureRandom::CHAR_UPPER
);
// use part file to prevent hasKey() to find the key
// while it is being written
$keyPart = $key . '.' . $uniqueId . '.part';
if ($storage and $storage->file_put_contents($keyPart, $value)) {
if ($ttl === 0) {
$ttl = 86400; // 60*60*24
}
$result = $storage->touch($keyPart, time() + $ttl);
$result &= $storage->rename($keyPart, $key);
}
return $result;
}
/**
* @param string $key
* @return bool
* @throws \OC\ForbiddenException
*/
public function hasKey($key) {
$storage = $this->getStorage();
if ($storage && $storage->is_file($key) && $storage->isReadable($key)) {
return true;
}
return false;
}
/**
* @param string $key
* @return bool|mixed
* @throws \OC\ForbiddenException
*/
public function remove($key) {
$storage = $this->getStorage();
if (!$storage) {
return false;
}
return $storage->unlink($key);
}
/**
* @param string $prefix
* @return bool
* @throws \OC\ForbiddenException
*/
public function clear($prefix = '') {
$storage = $this->getStorage();
if ($storage and $storage->is_dir('/')) {
$dh = $storage->opendir('/');
if (is_resource($dh)) {
while (($file = readdir($dh)) !== false) {
if ($file != '.' and $file != '..' and ($prefix === '' || strpos($file, $prefix) === 0)) {
$storage->unlink('/' . $file);
}
}
}
}
return true;
}
/**
* Runs GC
* @throws \OC\ForbiddenException
*/
public function gc() {
$storage = $this->getStorage();
if ($storage and $storage->is_dir('/')) {
// extra hour safety, in case of stray part chunks that take longer to write,
// because touch() is only called after the chunk was finished
$now = time() - 3600;
$dh = $storage->opendir('/');
if (!is_resource($dh)) {
return null;
}
while (($file = readdir($dh)) !== false) {
if ($file != '.' and $file != '..') {
try {
$mtime = $storage->filemtime('/' . $file);
if ($mtime < $now) {
$storage->unlink('/' . $file);
}
} catch (\OCP\Lock\LockedException $e) {
// ignore locked chunks
\OC::$server->getLogger()->debug('Could not cleanup locked chunk "' . $file . '"', array('app' => 'core'));
} catch (\OCP\Files\ForbiddenException $e) {
\OC::$server->getLogger()->debug('Could not cleanup forbidden chunk "' . $file . '"', array('app' => 'core'));
} catch (\OCP\Files\LockNotAcquiredException $e) {
\OC::$server->getLogger()->debug('Could not cleanup locked chunk "' . $file . '"', array('app' => 'core'));
}
}
}
}
}
}