nextcloud/apps/federatedfilesharing/lib/RequestHandler.php

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<?php
/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
*
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* @author Arthur Schiwon <blizzz@arthur-schiwon.de>
* @author Björn Schießle <bjoern@schiessle.org>
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* @author Joas Schilling <coding@schilljs.com>
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* @author Lukas Reschke <lukas@statuscode.ch>
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* @author Morris Jobke <hey@morrisjobke.de>
*
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* @license AGPL-3.0
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*
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* 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.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
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*
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* 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/>
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*
*/
namespace OCA\FederatedFileSharing;
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use OCA\Files_Sharing\Activity;
use OCP\AppFramework\Http;
use OCP\Constants;
use OCP\Files\NotFoundException;
use OCP\IDBConnection;
use OCP\IRequest;
use OCP\IUserManager;
use OCP\Share;
/**
* Class RequestHandler
*
* handles OCS Request to the federated share API
*
* @package OCA\FederatedFileSharing\API
*/
class RequestHandler {
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/** @var FederatedShareProvider */
private $federatedShareProvider;
/** @var IDBConnection */
private $connection;
/** @var Share\IManager */
private $shareManager;
/** @var IRequest */
private $request;
/** @var Notifications */
private $notifications;
/** @var AddressHandler */
private $addressHandler;
/** @var IUserManager */
private $userManager;
/** @var string */
private $shareTable = 'share';
/**
* Server2Server constructor.
*
* @param FederatedShareProvider $federatedShareProvider
* @param IDBConnection $connection
* @param Share\IManager $shareManager
* @param IRequest $request
* @param Notifications $notifications
* @param AddressHandler $addressHandler
* @param IUserManager $userManager
*/
public function __construct(FederatedShareProvider $federatedShareProvider,
IDBConnection $connection,
Share\IManager $shareManager,
IRequest $request,
Notifications $notifications,
AddressHandler $addressHandler,
IUserManager $userManager
) {
$this->federatedShareProvider = $federatedShareProvider;
$this->connection = $connection;
$this->shareManager = $shareManager;
$this->request = $request;
$this->notifications = $notifications;
$this->addressHandler = $addressHandler;
$this->userManager = $userManager;
}
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/**
* create a new share
*
* @param array $params
* @return \OC_OCS_Result
*/
public function createShare($params) {
if (!$this->isS2SEnabled(true)) {
return new \OC_OCS_Result(null, 503, 'Server does not support federated cloud sharing');
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}
$remote = isset($_POST['remote']) ? $_POST['remote'] : null;
$token = isset($_POST['token']) ? $_POST['token'] : null;
$name = isset($_POST['name']) ? $_POST['name'] : null;
$owner = isset($_POST['owner']) ? $_POST['owner'] : null;
$sharedBy = isset($_POST['sharedBy']) ? $_POST['sharedBy'] : null;
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$shareWith = isset($_POST['shareWith']) ? $_POST['shareWith'] : null;
$remoteId = isset($_POST['remoteId']) ? (int)$_POST['remoteId'] : null;
$sharedByFederatedId = isset($_POST['sharedByFederatedId']) ? $_POST['sharedByFederatedId'] : null;
$ownerFederatedId = isset($_POST['ownerFederatedId']) ? $_POST['ownerFederatedId'] : null;
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if ($remote && $token && $name && $owner && $remoteId && $shareWith) {
if(!\OCP\Util::isValidFileName($name)) {
return new \OC_OCS_Result(null, 400, 'The mountpoint name contains invalid characters.');
}
// FIXME this should be a method in the user management instead
\OCP\Util::writeLog('files_sharing', 'shareWith before, ' . $shareWith, \OCP\Util::DEBUG);
\OCP\Util::emitHook(
'\OCA\Files_Sharing\API\Server2Server',
'preLoginNameUsedAsUserName',
array('uid' => &$shareWith)
);
\OCP\Util::writeLog('files_sharing', 'shareWith after, ' . $shareWith, \OCP\Util::DEBUG);
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if (!\OCP\User::userExists($shareWith)) {
return new \OC_OCS_Result(null, 400, 'User does not exists');
}
\OC_Util::setupFS($shareWith);
$discoveryManager = new DiscoveryManager(
\OC::$server->getMemCacheFactory(),
\OC::$server->getHTTPClientService()
);
$externalManager = new \OCA\Files_Sharing\External\Manager(
\OC::$server->getDatabaseConnection(),
\OC\Files\Filesystem::getMountManager(),
\OC\Files\Filesystem::getLoader(),
\OC::$server->getHTTPHelper(),
\OC::$server->getNotificationManager(),
$discoveryManager,
$shareWith
);
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try {
$externalManager->addShare($remote, $token, '', $name, $owner, false, $shareWith, $remoteId);
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$shareId = \OC::$server->getDatabaseConnection()->lastInsertId('*PREFIX*share_external');
if ($ownerFederatedId === null) {
$ownerFederatedId = $owner . '@' . $this->cleanupRemote($remote);
}
// if the owner of the share and the initiator are the same user
// we also complete the federated share ID for the initiator
if ($sharedByFederatedId === null && $owner === $sharedBy) {
$sharedByFederatedId = $ownerFederatedId;
}
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\OC::$server->getActivityManager()->publishActivity(
Activity::FILES_SHARING_APP, Activity::SUBJECT_REMOTE_SHARE_RECEIVED, array($ownerFederatedId, trim($name, '/')), '', array(),
'', '', $shareWith, Activity::TYPE_REMOTE_SHARE, Activity::PRIORITY_LOW);
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$urlGenerator = \OC::$server->getURLGenerator();
$notificationManager = \OC::$server->getNotificationManager();
$notification = $notificationManager->createNotification();
$notification->setApp('files_sharing')
->setUser($shareWith)
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->setDateTime(new \DateTime())
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->setObject('remote_share', $shareId)
->setSubject('remote_share', [$ownerFederatedId, $sharedByFederatedId, trim($name, '/')]);
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$declineAction = $notification->createAction();
$declineAction->setLabel('decline')
->setLink($urlGenerator->getAbsoluteURL($urlGenerator->linkTo('', 'ocs/v1.php/apps/files_sharing/api/v1/remote_shares/pending/' . $shareId)), 'DELETE');
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$notification->addAction($declineAction);
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$acceptAction = $notification->createAction();
$acceptAction->setLabel('accept')
->setLink($urlGenerator->getAbsoluteURL($urlGenerator->linkTo('', 'ocs/v1.php/apps/files_sharing/api/v1/remote_shares/pending/' . $shareId)), 'POST');
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$notification->addAction($acceptAction);
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$notificationManager->notify($notification);
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return new \OC_OCS_Result();
} catch (\Exception $e) {
\OCP\Util::writeLog('files_sharing', 'server can not add remote share, ' . $e->getMessage(), \OCP\Util::ERROR);
return new \OC_OCS_Result(null, 500, 'internal server error, was not able to add share from ' . $remote);
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}
}
return new \OC_OCS_Result(null, 400, 'server can not add remote share, missing parameter');
}
/**
* create re-share on behalf of another user
*
* @param $params
* @return \OC_OCS_Result
*/
public function reShare($params) {
$id = isset($params['id']) ? (int)$params['id'] : null;
$token = $this->request->getParam('token', null);
$shareWith = $this->request->getParam('shareWith', null);
$permission = (int)$this->request->getParam('permission', null);
$remoteId = (int)$this->request->getParam('remoteId', null);
if ($id === null ||
$token === null ||
$shareWith === null ||
$permission === null ||
$remoteId === null
) {
return new \OC_OCS_Result(null, Http::STATUS_BAD_REQUEST);
}
try {
$share = $this->federatedShareProvider->getShareById($id);
} catch (Share\Exceptions\ShareNotFound $e) {
return new \OC_OCS_Result(null, Http::STATUS_NOT_FOUND);
}
// don't allow to share a file back to the owner
list($user, $remote) = $this->addressHandler->splitUserRemote($shareWith);
$owner = $share->getShareOwner();
$currentServer = $this->addressHandler->generateRemoteURL();
if ($this->addressHandler->compareAddresses($user, $remote,$owner , $currentServer)) {
return new \OC_OCS_Result(null, Http::STATUS_FORBIDDEN);
}
if ($this->verifyShare($share, $token)) {
// check if re-sharing is allowed
if ($share->getPermissions() | ~Constants::PERMISSION_SHARE) {
$share->setPermissions($share->getPermissions() & $permission);
// the recipient of the initial share is now the initiator for the re-share
$share->setSharedBy($share->getSharedWith());
$share->setSharedWith($shareWith);
try {
$result = $this->federatedShareProvider->create($share);
$this->federatedShareProvider->storeRemoteId((int)$result->getId(), $remoteId);
return new \OC_OCS_Result(['token' => $result->getToken(), 'remoteId' => $result->getId()]);
} catch (\Exception $e) {
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return new \OC_OCS_Result(null, Http::STATUS_BAD_REQUEST);
}
} else {
return new \OC_OCS_Result(null, Http::STATUS_FORBIDDEN);
}
}
return new \OC_OCS_Result(null, Http::STATUS_BAD_REQUEST);
}
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/**
* accept server-to-server share
*
* @param array $params
* @return \OC_OCS_Result
*/
public function acceptShare($params) {
if (!$this->isS2SEnabled()) {
return new \OC_OCS_Result(null, 503, 'Server does not support federated cloud sharing');
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}
$id = $params['id'];
$token = isset($_POST['token']) ? $_POST['token'] : null;
try {
$share = $this->federatedShareProvider->getShareById($id);
} catch (Share\Exceptions\ShareNotFound $e) {
return new \OC_OCS_Result();
}
if ($this->verifyShare($share, $token)) {
$this->executeAcceptShare($share);
if ($share->getShareOwner() !== $share->getSharedBy()) {
list(, $remote) = $this->addressHandler->splitUserRemote($share->getSharedBy());
$remoteId = $this->federatedShareProvider->getRemoteId($share);
$this->notifications->sendAcceptShare($remote, $remoteId, $share->getToken());
}
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}
return new \OC_OCS_Result();
}
protected function executeAcceptShare(Share\IShare $share) {
list($file, $link) = $this->getFile($this->getCorrectUid($share), $share->getNode()->getId());
$event = \OC::$server->getActivityManager()->generateEvent();
$event->setApp(Activity::FILES_SHARING_APP)
->setType(Activity::TYPE_REMOTE_SHARE)
->setAffectedUser($this->getCorrectUid($share))
->setSubject(Activity::SUBJECT_REMOTE_SHARE_ACCEPTED, [$share->getSharedWith(), basename($file)])
->setObject('files', $share->getNode()->getId(), $file)
->setLink($link);
\OC::$server->getActivityManager()->publish($event);
}
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/**
* decline server-to-server share
*
* @param array $params
* @return \OC_OCS_Result
*/
public function declineShare($params) {
if (!$this->isS2SEnabled()) {
return new \OC_OCS_Result(null, 503, 'Server does not support federated cloud sharing');
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}
$id = (int)$params['id'];
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$token = isset($_POST['token']) ? $_POST['token'] : null;
try {
$share = $this->federatedShareProvider->getShareById($id);
} catch (Share\Exceptions\ShareNotFound $e) {
return new \OC_OCS_Result();
}
if($this->verifyShare($share, $token)) {
if ($share->getShareOwner() !== $share->getSharedBy()) {
list(, $remote) = $this->addressHandler->splitUserRemote($share->getSharedBy());
$remoteId = $this->federatedShareProvider->getRemoteId($share);
$this->notifications->sendDeclineShare($remote, $remoteId, $share->getToken());
}
$this->executeDeclineShare($share);
}
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return new \OC_OCS_Result();
}
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/**
* delete declined share and create a activity
*
* @param Share\IShare $share
*/
protected function executeDeclineShare(Share\IShare $share) {
$this->federatedShareProvider->removeShareFromTable($share);
list($file, $link) = $this->getFile($this->getCorrectUid($share), $share->getNode()->getId());
$event = \OC::$server->getActivityManager()->generateEvent();
$event->setApp(Activity::FILES_SHARING_APP)
->setType(Activity::TYPE_REMOTE_SHARE)
->setAffectedUser($this->getCorrectUid($share))
->setSubject(Activity::SUBJECT_REMOTE_SHARE_DECLINED, [$share->getSharedWith(), basename($file)])
->setObject('files', $share->getNode()->getId(), $file)
->setLink($link);
\OC::$server->getActivityManager()->publish($event);
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}
/**
* check if we are the initiator or the owner of a re-share and return the correct UID
*
* @param Share\IShare $share
* @return string
*/
protected function getCorrectUid(Share\IShare $share) {
if($this->userManager->userExists($share->getShareOwner())) {
return $share->getShareOwner();
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}
return $share->getSharedBy();
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}
/**
* remove server-to-server share if it was unshared by the owner
*
* @param array $params
* @return \OC_OCS_Result
*/
public function unshare($params) {
if (!$this->isS2SEnabled()) {
return new \OC_OCS_Result(null, 503, 'Server does not support federated cloud sharing');
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}
$id = $params['id'];
$token = isset($_POST['token']) ? $_POST['token'] : null;
$query = \OCP\DB::prepare('SELECT * FROM `*PREFIX*share_external` WHERE `remote_id` = ? AND `share_token` = ?');
$query->execute(array($id, $token));
$share = $query->fetchRow();
if ($token && $id && !empty($share)) {
$remote = $this->cleanupRemote($share['remote']);
$owner = $share['owner'] . '@' . $remote;
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$mountpoint = $share['mountpoint'];
$user = $share['user'];
$query = \OCP\DB::prepare('DELETE FROM `*PREFIX*share_external` WHERE `remote_id` = ? AND `share_token` = ?');
$query->execute(array($id, $token));
if ($share['accepted']) {
$path = trim($mountpoint, '/');
} else {
$path = trim($share['name'], '/');
}
$notificationManager = \OC::$server->getNotificationManager();
$notification = $notificationManager->createNotification();
$notification->setApp('files_sharing')
->setUser($share['user'])
->setObject('remote_share', (int) $share['id']);
$notificationManager->markProcessed($notification);
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\OC::$server->getActivityManager()->publishActivity(
Activity::FILES_SHARING_APP, Activity::SUBJECT_REMOTE_SHARE_UNSHARED, array($owner, $path), '', array(),
'', '', $user, Activity::TYPE_REMOTE_SHARE, Activity::PRIORITY_MEDIUM);
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}
return new \OC_OCS_Result();
}
private function cleanupRemote($remote) {
$remote = substr($remote, strpos($remote, '://') + 3);
return rtrim($remote, '/');
}
/**
* federated share was revoked, either by the owner or the re-sharer
*
* @param $params
* @return \OC_OCS_Result
*/
public function revoke($params) {
$id = (int)$params['id'];
$token = $this->request->getParam('token');
$share = $this->federatedShareProvider->getShareById($id);
if ($this->verifyShare($share, $token)) {
$this->federatedShareProvider->removeShareFromTable($share);
return new \OC_OCS_Result();
}
return new \OC_OCS_Result(null, Http::STATUS_BAD_REQUEST);
}
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/**
* get share
*
* @param int $id
* @param string $token
* @return array|bool
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*/
protected function getShare($id, $token) {
$query = $this->connection->getQueryBuilder();
$query->select('*')->from($this->shareTable)
->where($query->expr()->eq('token', $query->createNamedParameter($token)))
->andWhere($query->expr()->eq('share_type', $query->createNamedParameter(FederatedShareProvider::SHARE_TYPE_REMOTE)))
->andWhere($query->expr()->eq('id', $query->createNamedParameter($id)));
$result = $query->execute()->fetchAll();
if (!empty($result) && isset($result[0])) {
return $result[0];
}
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return false;
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}
/**
* get file
*
* @param string $user
* @param int $fileSource
* @return array with internal path of the file and a absolute link to it
*/
private function getFile($user, $fileSource) {
\OC_Util::setupFS($user);
try {
$file = \OC\Files\Filesystem::getPath($fileSource);
} catch (NotFoundException $e) {
$file = null;
}
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$args = \OC\Files\Filesystem::is_dir($file) ? array('dir' => $file) : array('dir' => dirname($file), 'scrollto' => $file);
$link = \OCP\Util::linkToAbsolute('files', 'index.php', $args);
return array($file, $link);
}
/**
* check if server-to-server sharing is enabled
*
* @param bool $incoming
* @return bool
*/
private function isS2SEnabled($incoming = false) {
$result = \OCP\App::isEnabled('files_sharing');
if ($incoming) {
$result = $result && $this->federatedShareProvider->isIncomingServer2serverShareEnabled();
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} else {
$result = $result && $this->federatedShareProvider->isOutgoingServer2serverShareEnabled();
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}
return $result;
}
/**
* check if we got the right share
*
* @param Share\IShare $share
* @param string $token
* @return bool
*/
protected function verifyShare(Share\IShare $share, $token) {
if (
$share->getShareType() === FederatedShareProvider::SHARE_TYPE_REMOTE &&
$share->getToken() === $token
) {
return true;
}
return false;
}
/**
* update share information to keep federated re-shares in sync
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*
* @param array $params
* @return \OC_OCS_Result
*/
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public function updatePermissions($params) {
$id = (int)$params['id'];
$token = $this->request->getParam('token', null);
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$permissions = $this->request->getParam('permissions', null);
try {
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$share = $this->federatedShareProvider->getShareById($id);
} catch (Share\Exceptions\ShareNotFound $e) {
return new \OC_OCS_Result(null, Http::STATUS_BAD_REQUEST);
}
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$validPermission = ctype_digit($permissions);
$validToken = $this->verifyShare($share, $token);
if ($validPermission && $validToken) {
$this->updatePermissionsInDatabase($share, (int)$permissions);
} else {
return new \OC_OCS_Result(null, Http::STATUS_BAD_REQUEST);
}
return new \OC_OCS_Result();
}
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/**
* update permissions in database
*
* @param IShare $share
* @param int $permissions
*/
protected function updatePermissionsInDatabase(IShare $share, $permissions) {
$query = $this->connection->getQueryBuilder();
$query->update('share')
->where($query->expr()->eq('id', $query->createNamedParameter($share->getId())))
->set('permissions', $query->createNamedParameter($permissions))
->execute();
}
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}