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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Bjoern Schiessle <bjoern@schiessle.org>
* @author Lukas Reschke <lukas@statuscode.ch>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Roeland Jago Douma <roeland@famdouma.nl>
* @author Thomas Müller <thomas.mueller@tmit.eu>
*
* @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\Files_Sharing\Middleware;
use OCA\Files_Sharing\Controller\ExternalSharesController;
use OCA\Files_Sharing\Controller\ShareController;
use OCP\App\IAppManager;
use OCP\AppFramework\Controller;
use OCP\AppFramework\Http\NotFoundResponse;
use OCP\AppFramework\Middleware;
use OCP\Files\NotFoundException;
use OCP\IConfig;
use OCP\AppFramework\Utility\IControllerMethodReflector;
use OCA\Files_Sharing\Exceptions\S2SException;
use OCP\AppFramework\Http\JSONResponse;
use OCP\IRequest;
use OCP\Share\IManager;
use OCP\Share\Exceptions\ShareNotFound;
/**
* Checks whether the "sharing check" is enabled
*
* @package OCA\Files_Sharing\Middleware
*/
class SharingCheckMiddleware extends Middleware {
/** @var string */
protected $appName;
/** @var IConfig */
protected $config;
/** @var IAppManager */
protected $appManager;
/** @var IControllerMethodReflector */
protected $reflector;
/** @var IManager */
protected $shareManager;
/** @var IRequest */
protected $request;
/***
* @param string $appName
* @param IConfig $config
* @param IAppManager $appManager
* @param IControllerMethodReflector $reflector
* @param IManager $shareManager
* @param IRequest $request
*/
public function __construct($appName,
IConfig $config,
IAppManager $appManager,
IControllerMethodReflector $reflector,
IManager $shareManager,
IRequest $request
) {
$this->appName = $appName;
$this->config = $config;
$this->appManager = $appManager;
$this->reflector = $reflector;
$this->shareManager = $shareManager;
$this->request = $request;
}
/**
* Check if sharing is enabled before the controllers is executed
*
* @param Controller $controller
* @param string $methodName
* @throws NotFoundException
* @throws S2SException
* @throws ShareNotFound
*/
public function beforeController($controller, $methodName) {
if(!$this->isSharingEnabled()) {
throw new NotFoundException('Sharing is disabled.');
}
if ($controller instanceof ExternalSharesController &&
!$this->externalSharesChecks()) {
throw new S2SException('Federated sharing not allowed');
} else if ($controller instanceof ShareController) {
$token = $this->request->getParam('token');
$share = $this->shareManager->getShareByToken($token);
if ($share->getShareType() === \OCP\Share::SHARE_TYPE_LINK
&& !$this->isLinkSharingEnabled()) {
throw new NotFoundException('Link sharing is disabled');
}
}
}
/**
* Return 404 page in case of a not found exception
*
* @param Controller $controller
* @param string $methodName
* @param \Exception $exception
* @return NotFoundResponse
* @throws \Exception
*/
public function afterException($controller, $methodName, \Exception $exception) {
if(is_a($exception, '\OCP\Files\NotFoundException')) {
return new NotFoundResponse();
}
if (is_a($exception, '\OCA\Files_Sharing\Exceptions\S2SException')) {
return new JSONResponse($exception->getMessage(), 405);
}
throw $exception;
}
/**
* Checks for externalshares controller
* @return bool
*/
private function externalSharesChecks() {
if (!$this->reflector->hasAnnotation('NoIncomingFederatedSharingRequired') &&
$this->config->getAppValue('files_sharing', 'incoming_server2server_share_enabled', 'yes') !== 'yes') {
return false;
}
if (!$this->reflector->hasAnnotation('NoOutgoingFederatedSharingRequired') &&
$this->config->getAppValue('files_sharing', 'outgoing_server2server_share_enabled', 'yes') !== 'yes') {
return false;
}
return true;
}
/**
* Check whether sharing is enabled
* @return bool
*/
private function isSharingEnabled() {
// FIXME: This check is done here since the route is globally defined and not inside the files_sharing app
// Check whether the sharing application is enabled
if(!$this->appManager->isEnabledForUser($this->appName)) {
return false;
}
return true;
}
/**
* Check if link sharing is allowed
* @return bool
*/
private function isLinkSharingEnabled() {
// Check if the shareAPI is enabled
if ($this->config->getAppValue('core', 'shareapi_enabled', 'yes') !== 'yes') {
return false;
}
// Check whether public sharing is enabled
if($this->config->getAppValue('core', 'shareapi_allow_links', 'yes') !== 'yes') {
return false;
}
return true;
}
}