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<?php
declare(strict_types=1);
/**
*
* @copyright Copyright (c) 2018, Daniel Calviño Sánchez (danxuliu@gmail.com)
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* 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
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OCA\Talk\Files;
use OCA\Talk\Events\JoinRoomGuestEvent;
use OCA\Talk\Events\JoinRoomUserEvent;
use OCA\Talk\Exceptions\ParticipantNotFoundException;
use OCA\Talk\Exceptions\UnauthorizedException;
use OCA\Talk\Room;
use OCA\Talk\TalkSession;
use OCP\EventDispatcher\IEventDispatcher;
/**
* Custom behaviour for rooms for files.
*
* The rooms for files are intended to give the users a way to talk about a
* specific shared file, for example, when collaboratively editing it. The room
* is persistent and can be accessed simultaneously by any user or guest if the
* file is publicly shared (link share, for example), or by any user with direct
* access (user, group, circle and room share, but not link share, for example)
* to that file (or to an ancestor). The room has no owner, although self joined
* users with direct access become persistent participants automatically when
* they join until they explicitly leave or no longer have access to the file.
*
* These rooms are associated to a "file" object, and their custom behaviour is
* provided by calling the methods of this class as a response to different room
* events.
*/
class Listener {
/** @var Util */
protected $util;
/** @var TalkSession */
protected $talkSession;
public function __construct(Util $util,
TalkSession $talkSession) {
$this->util = $util;
$this->talkSession = $talkSession;
}
public static function register(IEventDispatcher $dispatcher): void {
$listener = static function(JoinRoomUserEvent $event) {
/** @var self $listener */
$listener = \OC::$server->query(self::class);
try {
$listener->preventUsersWithoutAccessToTheFileFromJoining($event->getRoom(), $event->getUser()->getUID());
$listener->addUserAsPersistentParticipant($event->getRoom(), $event->getUser()->getUID());
} catch (UnauthorizedException $e) {
$event->setCancelJoin(true);
}
};
$dispatcher->addListener(Room::EVENT_BEFORE_ROOM_CONNECT, $listener);
$listener = static function(JoinRoomGuestEvent $event) {
/** @var self $listener */
$listener = \OC::$server->query(self::class);
try {
$listener->preventGuestsFromJoiningIfNotPubliclyAccessible($event->getRoom());
} catch (UnauthorizedException $e) {
$event->setCancelJoin( true);
}
};
$dispatcher->addListener(Room::EVENT_BEFORE_GUEST_CONNECT, $listener);
}
/**
* Prevents users from joining if they do not have access to the file.
*
* A user has access to the file if the file is publicly accessible (through
* a link share, for example) or if the user has direct access to it.
*
* A user has direct access to a file if she received the file (or an
* ancestor) through a user, group, circle or room share (but not through a
* link share, for example), or if she is the owner of such a file.
*
* This method should be called before a user joins a room.
*
* @param Room $room
* @param string $userId
* @throws UnauthorizedException
*/
public function preventUsersWithoutAccessToTheFileFromJoining(Room $room, string $userId): void {
if ($room->getObjectType() !== 'file') {
return;
}
// If a guest can access the file then any user can too.
$shareToken = $this->talkSession->getFileShareTokenForRoom($room->getToken());
if ($shareToken && $this->util->canGuestAccessFile($shareToken)) {
return;
}
$share = $this->util->getAnyPublicShareOfFileOwnedByUserOrAnyDirectShareOfFileAccessibleByUser($room->getObjectId(), $userId);
if (!$share) {
$groupFolder = $this->util->getGroupFolderNode($room->getObjectId(), $userId);
if (!$groupFolder) {
throw new UnauthorizedException('User does not have access to the file');
}
}
}
/**
* Add user as a persistent participant of a file room.
*
* Only users with direct access to the file are added as persistent
* participants of the room.
*
* This method should be called before a user joins a room, but only if the
* user should be able to join the room.
*
* @param Room $room
* @param string $userId
*/
public function addUserAsPersistentParticipant(Room $room, string $userId): void {
if ($room->getObjectType() !== 'file') {
return;
}
if (!$this->util->getAnyPublicShareOfFileOwnedByUserOrAnyDirectShareOfFileAccessibleByUser($room->getObjectId(), $userId)) {
return;
}
try {
$room->getParticipant($userId);
} catch (ParticipantNotFoundException $e) {
$room->addUsers(['userId' => $userId]);
}
}
/**
* Prevents guests from joining the room if it is not publicly accessible.
*
* This method should be called before a guest joins a room.
*
* @param Room $room
* @throws UnauthorizedException
*/
protected function preventGuestsFromJoiningIfNotPubliclyAccessible(Room $room): void {
if ($room->getObjectType() !== 'file') {
return;
}
$shareToken = $this->talkSession->getFileShareTokenForRoom($room->getToken());
if ($shareToken && $this->util->canGuestAccessFile($shareToken)) {
return;
}
throw new UnauthorizedException('Guests are not allowed in this room');
}
}
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