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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Bjoern Schiessle <bjoern@schiessle.org>
* @author Björn Schießle <bjoern@schiessle.org>
* @author Joas Schilling <coding@schilljs.com>
* @author Lukas Reschke <lukas@statuscode.ch>
* @author Michael Jobst <mjobst+github@tecratech.de>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin Appelman <robin@icewind.nl>
* @author Robin McCorkell <robin@mccorkell.me.uk>
* @author Roeland Jago Douma <roeland@famdouma.nl>
* @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 OCA\DAV\Connector\Sabre;
use OC\AppFramework\Http\Request;
use OCP\Files\ForbiddenException;
use OCP\IPreview;
use Sabre\DAV\Exception\Forbidden;
use Sabre\DAV\Exception\NotFound;
use Sabre\DAV\IFile;
use \Sabre\DAV\PropFind;
use \Sabre\DAV\PropPatch;
use Sabre\DAV\ServerPlugin;
use Sabre\DAV\Tree;
use \Sabre\HTTP\RequestInterface;
use \Sabre\HTTP\ResponseInterface;
use OCP\Files\StorageNotAvailableException;
use OCP\IConfig;
use OCP\IRequest;
class FilesPlugin extends ServerPlugin {
// namespace
const NS_OWNCLOUD = 'http://owncloud.org/ns';
const NS_NEXTCLOUD = 'http://nextcloud.org/ns';
const FILEID_PROPERTYNAME = '{http://owncloud.org/ns}id';
const INTERNAL_FILEID_PROPERTYNAME = '{http://owncloud.org/ns}fileid';
const PERMISSIONS_PROPERTYNAME = '{http://owncloud.org/ns}permissions';
const SHARE_PERMISSIONS_PROPERTYNAME = '{http://open-collaboration-services.org/ns}share-permissions';
const DOWNLOADURL_PROPERTYNAME = '{http://owncloud.org/ns}downloadURL';
const SIZE_PROPERTYNAME = '{http://owncloud.org/ns}size';
const GETETAG_PROPERTYNAME = '{DAV:}getetag';
const LASTMODIFIED_PROPERTYNAME = '{DAV:}lastmodified';
const OWNER_ID_PROPERTYNAME = '{http://owncloud.org/ns}owner-id';
const OWNER_DISPLAY_NAME_PROPERTYNAME = '{http://owncloud.org/ns}owner-display-name';
const CHECKSUMS_PROPERTYNAME = '{http://owncloud.org/ns}checksums';
const DATA_FINGERPRINT_PROPERTYNAME = '{http://owncloud.org/ns}data-fingerprint';
const HAS_PREVIEW_PROPERTYNAME = '{http://nextcloud.org/ns}has-preview';
const MOUNT_TYPE_PROPERTYNAME = '{http://nextcloud.org/ns}mount-type';
const IS_ENCRYPTED_PROPERTYNAME = '{http://nextcloud.org/ns}is-encrypted';
/**
* Reference to main server object
*
* @var \Sabre\DAV\Server
*/
private $server;
/**
* @var Tree
*/
private $tree;
/**
* Whether this is public webdav.
* If true, some returned information will be stripped off.
*
* @var bool
*/
private $isPublic;
/**
* @var bool
*/
private $downloadAttachment;
/**
* @var IConfig
*/
private $config;
/**
* @var IRequest
*/
private $request;
/**
* @var IPreview
*/
private $previewManager;
/**
* @param Tree $tree
* @param IConfig $config
* @param IRequest $request
* @param IPreview $previewManager
* @param bool $isPublic
* @param bool $downloadAttachment
*/
public function __construct(Tree $tree,
IConfig $config,
IRequest $request,
IPreview $previewManager,
$isPublic = false,
$downloadAttachment = true) {
$this->tree = $tree;
$this->config = $config;
$this->request = $request;
$this->isPublic = $isPublic;
$this->downloadAttachment = $downloadAttachment;
$this->previewManager = $previewManager;
}
/**
* This initializes the plugin.
*
* This function is called by \Sabre\DAV\Server, after
* addPlugin is called.
*
* This method should set up the required event subscriptions.
*
* @param \Sabre\DAV\Server $server
* @return void
*/
public function initialize(\Sabre\DAV\Server $server) {
$server->xml->namespaceMap[self::NS_OWNCLOUD] = 'oc';
$server->xml->namespaceMap[self::NS_NEXTCLOUD] = 'nc';
$server->protectedProperties[] = self::FILEID_PROPERTYNAME;
$server->protectedProperties[] = self::INTERNAL_FILEID_PROPERTYNAME;
$server->protectedProperties[] = self::PERMISSIONS_PROPERTYNAME;
$server->protectedProperties[] = self::SHARE_PERMISSIONS_PROPERTYNAME;
$server->protectedProperties[] = self::SIZE_PROPERTYNAME;
$server->protectedProperties[] = self::DOWNLOADURL_PROPERTYNAME;
$server->protectedProperties[] = self::OWNER_ID_PROPERTYNAME;
$server->protectedProperties[] = self::OWNER_DISPLAY_NAME_PROPERTYNAME;
$server->protectedProperties[] = self::CHECKSUMS_PROPERTYNAME;
$server->protectedProperties[] = self::DATA_FINGERPRINT_PROPERTYNAME;
$server->protectedProperties[] = self::HAS_PREVIEW_PROPERTYNAME;
$server->protectedProperties[] = self::MOUNT_TYPE_PROPERTYNAME;
$server->protectedProperties[] = self::IS_ENCRYPTED_PROPERTYNAME;
// normally these cannot be changed (RFC4918), but we want them modifiable through PROPPATCH
$allowedProperties = ['{DAV:}getetag'];
$server->protectedProperties = array_diff($server->protectedProperties, $allowedProperties);
$this->server = $server;
$this->server->on('propFind', array($this, 'handleGetProperties'));
$this->server->on('propPatch', array($this, 'handleUpdateProperties'));
$this->server->on('afterBind', array($this, 'sendFileIdHeader'));
$this->server->on('afterWriteContent', array($this, 'sendFileIdHeader'));
$this->server->on('afterMethod:GET', [$this,'httpGet']);
$this->server->on('afterMethod:GET', array($this, 'handleDownloadToken'));
$this->server->on('afterResponse', function($request, ResponseInterface $response) {
$body = $response->getBody();
if (is_resource($body)) {
fclose($body);
}
});
$this->server->on('beforeMove', [$this, 'checkMove']);
}
/**
* Plugin that checks if a move can actually be performed.
*
* @param string $source source path
* @param string $destination destination path
* @throws Forbidden
* @throws NotFound
*/
function checkMove($source, $destination) {
$sourceNode = $this->tree->getNodeForPath($source);
if (!$sourceNode instanceof Node) {
return;
}
list($sourceDir,) = \Sabre\Uri\split($source);
list($destinationDir,) = \Sabre\Uri\split($destination);
if ($sourceDir !== $destinationDir) {
$sourceNodeFileInfo = $sourceNode->getFileInfo();
if ($sourceNodeFileInfo === null) {
throw new NotFound($source . ' does not exist');
}
if (!$sourceNodeFileInfo->isDeletable()) {
throw new Forbidden($source . " cannot be deleted");
}
}
}
/**
* This sets a cookie to be able to recognize the start of the download
* the content must not be longer than 32 characters and must only contain
* alphanumeric characters
*
* @param RequestInterface $request
* @param ResponseInterface $response
*/
function handleDownloadToken(RequestInterface $request, ResponseInterface $response) {
$queryParams = $request->getQueryParameters();
/**
* this sets a cookie to be able to recognize the start of the download
* the content must not be longer than 32 characters and must only contain
* alphanumeric characters
*/
if (isset($queryParams['downloadStartSecret'])) {
$token = $queryParams['downloadStartSecret'];
if (!isset($token[32])
&& preg_match('!^[a-zA-Z0-9]+$!', $token) === 1) {
// FIXME: use $response->setHeader() instead
setcookie('ocDownloadStarted', $token, time() + 20, '/');
}
}
}
/**
* Add headers to file download
*
* @param RequestInterface $request
* @param ResponseInterface $response
*/
function httpGet(RequestInterface $request, ResponseInterface $response) {
// Only handle valid files
$node = $this->tree->getNodeForPath($request->getPath());
if (!($node instanceof IFile)) return;
// adds a 'Content-Disposition: attachment' header in case no disposition
// header has been set before
if ($this->downloadAttachment &&
$response->getHeader('Content-Disposition') === null) {
$filename = $node->getName();
if ($this->request->isUserAgent(
[
Request::USER_AGENT_IE,
Request::USER_AGENT_ANDROID_MOBILE_CHROME,
Request::USER_AGENT_FREEBOX,
])) {
$response->addHeader('Content-Disposition', 'attachment; filename="' . rawurlencode($filename) . '"');
} else {
$response->addHeader('Content-Disposition', 'attachment; filename*=UTF-8\'\'' . rawurlencode($filename)
. '; filename="' . rawurlencode($filename) . '"');
}
}
if ($node instanceof \OCA\DAV\Connector\Sabre\File) {
//Add OC-Checksum header
/** @var $node File */
$checksum = $node->getChecksum();
if ($checksum !== null && $checksum !== '') {
$response->addHeader('OC-Checksum', $checksum);
}
}
}
/**
* Adds all ownCloud-specific properties
*
* @param PropFind $propFind
* @param \Sabre\DAV\INode $node
* @return void
*/
public function handleGetProperties(PropFind $propFind, \Sabre\DAV\INode $node) {
$httpRequest = $this->server->httpRequest;
if ($node instanceof \OCA\DAV\Connector\Sabre\Node) {
/**
* This was disabled, because it made dir listing throw an exception,
* so users were unable to navigate into folders where one subitem
* is blocked by the files_accesscontrol app, see:
* https://github.com/nextcloud/files_accesscontrol/issues/65
if (!$node->getFileInfo()->isReadable()) {
// avoid detecting files through this means
throw new NotFound();
}
*/
$propFind->handle(self::FILEID_PROPERTYNAME, function() use ($node) {
return $node->getFileId();
});
$propFind->handle(self::INTERNAL_FILEID_PROPERTYNAME, function() use ($node) {
return $node->getInternalFileId();
});
$propFind->handle(self::PERMISSIONS_PROPERTYNAME, function() use ($node) {
$perms = $node->getDavPermissions();
if ($this->isPublic) {
// remove mount information
$perms = str_replace(['S', 'M'], '', $perms);
}
return $perms;
});
$propFind->handle(self::SHARE_PERMISSIONS_PROPERTYNAME, function() use ($node, $httpRequest) {
return $node->getSharePermissions(
$httpRequest->getRawServerValue('PHP_AUTH_USER')
);
});
$propFind->handle(self::GETETAG_PROPERTYNAME, function() use ($node) {
return $node->getETag();
});
$propFind->handle(self::OWNER_ID_PROPERTYNAME, function() use ($node) {
$owner = $node->getOwner();
if (!$owner) {
return null;
} else {
return $owner->getUID();
}
});
$propFind->handle(self::OWNER_DISPLAY_NAME_PROPERTYNAME, function() use ($node) {
$owner = $node->getOwner();
if (!$owner) {
return null;
} else {
return $owner->getDisplayName();
}
});
$propFind->handle(self::HAS_PREVIEW_PROPERTYNAME, function () use ($node) {
return json_encode($this->previewManager->isAvailable($node->getFileInfo()));
});
$propFind->handle(self::SIZE_PROPERTYNAME, function() use ($node) {
return $node->getSize();
});
$propFind->handle(self::MOUNT_TYPE_PROPERTYNAME, function () use ($node) {
return $node->getFileInfo()->getMountPoint()->getMountType();
});
}
if ($node instanceof \OCA\DAV\Connector\Sabre\Node) {
$propFind->handle(self::DATA_FINGERPRINT_PROPERTYNAME, function() use ($node) {
return $this->config->getSystemValue('data-fingerprint', '');
});
}
if ($node instanceof \OCA\DAV\Connector\Sabre\File) {
$propFind->handle(self::DOWNLOADURL_PROPERTYNAME, function() use ($node) {
/** @var $node \OCA\DAV\Connector\Sabre\File */
try {
$directDownloadUrl = $node->getDirectDownload();
if (isset($directDownloadUrl['url'])) {
return $directDownloadUrl['url'];
}
} catch (StorageNotAvailableException $e) {
return false;
} catch (ForbiddenException $e) {
return false;
}
return false;
});
$propFind->handle(self::CHECKSUMS_PROPERTYNAME, function() use ($node) {
$checksum = $node->getChecksum();
if ($checksum === NULL || $checksum === '') {
return null;
}
return new ChecksumList($checksum);
});
}
if ($node instanceof \OCA\DAV\Connector\Sabre\Directory) {
$propFind->handle(self::SIZE_PROPERTYNAME, function() use ($node) {
return $node->getSize();
});
$propFind->handle(self::IS_ENCRYPTED_PROPERTYNAME, function() use ($node) {
return $node->getFileInfo()->isEncrypted() ? '1' : '0';
});
}
}
/**
* Update ownCloud-specific properties
*
* @param string $path
* @param PropPatch $propPatch
*
* @return void
*/
public function handleUpdateProperties($path, PropPatch $propPatch) {
$node = $this->tree->getNodeForPath($path);
if (!($node instanceof \OCA\DAV\Connector\Sabre\Node)) {
return;
}
$propPatch->handle(self::LASTMODIFIED_PROPERTYNAME, function($time) use ($node) {
if (empty($time)) {
return false;
}
$node->touch($time);
return true;
});
$propPatch->handle(self::GETETAG_PROPERTYNAME, function($etag) use ($node) {
if (empty($etag)) {
return false;
}
if ($node->setEtag($etag) !== -1) {
return true;
}
return false;
});
}
/**
* @param string $filePath
* @param \Sabre\DAV\INode $node
* @throws \Sabre\DAV\Exception\BadRequest
*/
public function sendFileIdHeader($filePath, \Sabre\DAV\INode $node = null) {
// chunked upload handling
if (isset($_SERVER['HTTP_OC_CHUNKED'])) {
list($path, $name) = \Sabre\Uri\split($filePath);
$info = \OC_FileChunking::decodeName($name);
if (!empty($info)) {
$filePath = $path . '/' . $info['name'];
}
}
// we get the node for the given $filePath here because in case of afterCreateFile $node is the parent folder
if (!$this->server->tree->nodeExists($filePath)) {
return;
}
$node = $this->server->tree->getNodeForPath($filePath);
if ($node instanceof \OCA\DAV\Connector\Sabre\Node) {
$fileId = $node->getFileId();
if (!is_null($fileId)) {
$this->server->httpResponse->setHeader('OC-FileId', $fileId);
}
}
}
}