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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Bart Visscher <bartv@thisnet.nl>
* @author Christoph Wurst <christoph@winzerhof-wurst.at>
* @author Felix Moeller <mail@felixmoeller.de>
* @author Jörn Friedrich Dreyer <jfd@butonic.de>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin Appelman <robin@icewind.nl>
* @author Roeland Jago Douma <roeland@famdouma.nl>
* @author Thomas Müller <thomas.mueller@tmit.eu>
* @author Thomas Tanghus <thomas@tanghus.net>
* @author Vincent Petry <vincent@nextcloud.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/>
*
*/
class OC_FileChunking {
protected $info;
protected $cache;
/**
* TTL of chunks
*
* @var int
*/
protected $ttl;
public static function decodeName($name) {
preg_match('/(?P<name>.*)-chunking-(?P<transferid>\d+)-(?P<chunkcount>\d+)-(?P<index>\d+)/', $name, $matches);
return $matches;
}
/**
* @param string[] $info
*/
public function __construct($info) {
$this->info = $info;
$this->ttl = \OC::$server->getConfig()->getSystemValueInt('cache_chunk_gc_ttl', 86400);
}
public function getPrefix() {
$name = $this->info['name'];
$transferid = $this->info['transferid'];
return $name.'-chunking-'.$transferid.'-';
}
protected function getCache() {
if (!isset($this->cache)) {
$this->cache = new \OC\Cache\File();
}
return $this->cache;
}
/**
* Stores the given $data under the given $key - the number of stored bytes is returned
*
* @param string $index
* @param resource $data
* @return int
*/
public function store($index, $data) {
$cache = $this->getCache();
$name = $this->getPrefix().$index;
$cache->set($name, $data, $this->ttl);
return $cache->size($name);
}
public function isComplete() {
$prefix = $this->getPrefix();
$cache = $this->getCache();
$chunkcount = (int)$this->info['chunkcount'];
for ($i = ($chunkcount - 1); $i >= 0; $i--) {
if (!$cache->hasKey($prefix.$i)) {
return false;
}
}
return true;
}
/**
* Assembles the chunks into the file specified by the path.
* Chunks are deleted afterwards.
*
* @param resource $f target path
*
* @return integer assembled file size
*
* @throws \OC\InsufficientStorageException when file could not be fully
* assembled due to lack of free space
*/
public function assemble($f) {
$cache = $this->getCache();
$prefix = $this->getPrefix();
$count = 0;
for ($i = 0; $i < $this->info['chunkcount']; $i++) {
$chunk = $cache->get($prefix.$i);
// remove after reading to directly save space
$cache->remove($prefix.$i);
$count += fwrite($f, $chunk);
// let php release the memory to work around memory exhausted error with php 5.6
$chunk = null;
}
return $count;
}
/**
* Returns the size of the chunks already present
* @return integer size in bytes
*/
public function getCurrentSize() {
$cache = $this->getCache();
$prefix = $this->getPrefix();
$total = 0;
for ($i = 0; $i < $this->info['chunkcount']; $i++) {
$total += $cache->size($prefix.$i);
}
return $total;
}
/**
* Removes all chunks which belong to this transmission
*/
public function cleanup() {
$cache = $this->getCache();
$prefix = $this->getPrefix();
for ($i = 0; $i < $this->info['chunkcount']; $i++) {
$cache->remove($prefix.$i);
}
}
/**
* Removes one specific chunk
* @param string $index
*/
public function remove($index) {
$cache = $this->getCache();
$prefix = $this->getPrefix();
$cache->remove($prefix.$index);
}
/**
* Assembles the chunks into the file specified by the path.
* Also triggers the relevant hooks and proxies.
*
* @param \OC\Files\Storage\Storage $storage storage
* @param string $path target path relative to the storage
* @return bool true on success or false if file could not be created
*
* @throws \OC\ServerNotAvailableException
*/
public function file_assemble($storage, $path) {
// use file_put_contents as method because that best matches what this function does
if (\OC\Files\Filesystem::isValidPath($path)) {
$target = $storage->fopen($path, 'w');
if ($target) {
$count = $this->assemble($target);
fclose($target);
return $count > 0;
} else {
return false;
}
}
return false;
}
}
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