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<?php
/**
* @author Thomas Müller <thomas.mueller@tmit.eu>
*
* @copyright Copyright (c) 2017, ownCloud GmbH
* @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 OCA\DAV\Upload;
use Sabre\DAV\Exception\BadRequest;
use Sabre\DAV\Server;
use Sabre\DAV\ServerPlugin;
class ChunkingPlugin extends ServerPlugin {
/** @var Server */
private $server;
/** @var FutureFile */
private $sourceNode;
/**
* @inheritdoc
*/
function initialize(Server $server) {
$server->on('beforeMove', [$this, 'beforeMove']);
$this->server = $server;
}
/**
* @param string $sourcePath source path
* @param string $destination destination path
*/
function beforeMove($sourcePath, $destination) {
$this->sourceNode = $this->server->tree->getNodeForPath($sourcePath);
if (!$this->sourceNode instanceof FutureFile) {
// skip handling as the source is not a chunked FutureFile
return;
}
$this->verifySize();
return $this->performMove($sourcePath, $destination);
}
/**
* Move handler for future file.
*
* This overrides the default move behavior to prevent Sabre
* to delete the target file before moving. Because deleting would
* lose the file id and metadata.
*
* @param string $path source path
* @param string $destination destination path
* @return bool|void false to stop handling, void to skip this handler
*/
public function performMove($path, $destination) {
// do a move manually, skipping Sabre's default "delete" for existing nodes
try {
$this->server->tree->move($path, $destination);
} catch (Forbidden $e) {
$sourceNode = $this->server->tree->getNodeForPath($path);
if ($sourceNode instanceof FutureFile) {
$sourceNode->delete();
}
throw $e;
}
// trigger all default events (copied from CorePlugin::move)
$this->server->emit('afterMove', [$path, $destination]);
$this->server->emit('afterUnbind', [$path]);
$this->server->emit('afterBind', [$destination]);
$response = $this->server->httpResponse;
$response->setHeader('Content-Length', '0');
$response->setStatus(204);
return false;
}
/**
* @throws BadRequest
*/
private function verifySize() {
$expectedSize = $this->server->httpRequest->getHeader('OC-Total-Length');
if ($expectedSize === null) {
return;
}
$actualSize = $this->sourceNode->getSize();
// casted to string because cast to float cause equality for non equal numbers
// and integer has the problem of limited size on 32 bit systems
if ((string)$expectedSize !== (string)$actualSize) {
throw new BadRequest("Chunks on server do not sum up to $expectedSize but to $actualSize bytes");
}
}
}
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