owncloud/core

<?php
/**
 * @author Thomas Müller <thomas.mueller@tmit.eu>
 * @author Vincent Petry <pvince81@owncloud.com>
 *
 * @copyright Copyright (c) 2018, 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\SystemTag;

use OCP\Files\IRootFolder;
use OCP\IGroupManager;
use OCP\IUserSession;
use OCP\SystemTag\ISystemTagManager;
use OCP\SystemTag\ISystemTagObjectMapper;
use Sabre\DAV\Exception\Forbidden;
use Sabre\DAV\Exception\MethodNotAllowed;
use Sabre\DAV\Exception\NotFound;
use Sabre\DAV\ICollection;

/**
 * Collection containing object ids by object type
 */
class SystemTagsObjectTypeCollection implements ICollection {
    /**
     * @var string
     */
    private $objectType;

    /**
     * @var ISystemTagManager
     */
    private $tagManager;

    /**
     * @var ISystemTagObjectMapper
     */
    private $tagMapper;

    /**
     * @var IGroupManager
     */
    private $groupManager;

    /**
     * @var IUserSession
     */
    private $userSession;

    /**
     * @var IRootFolder
     **/
    protected $fileRoot;

    /**
     * Constructor
     *
     * @param string $objectType object type
     * @param ISystemTagManager $tagManager
     * @param ISystemTagObjectMapper $tagMapper
     * @param IUserSession $userSession
     * @param IGroupManager $groupManager
     * @param IRootFolder $fileRoot
     */
    public function __construct(
        $objectType,
        ISystemTagManager $tagManager,
        ISystemTagObjectMapper $tagMapper,
        IUserSession $userSession,
        IGroupManager $groupManager,
        IRootFolder $fileRoot
    ) {
        $this->tagManager = $tagManager;
        $this->tagMapper = $tagMapper;
        $this->objectType = $objectType;
        $this->userSession = $userSession;
        $this->groupManager = $groupManager;
        $this->fileRoot = $fileRoot;
    }

    /**
     * @param string $name
     * @param resource|string $data Initial payload
     * @throws Forbidden
     */
    public function createFile($name, $data = null) {
        throw new Forbidden('Permission denied to create nodes');
    }

    /**
     * @param string $name
     */
    public function createDirectory($name) {
        throw new Forbidden('Permission denied to create collections');
    }

    /**
     * @param string $objectId
     */
    public function getChild($objectId) {
        // make sure the object exists and is reachable
        if (!$this->childExists($objectId)) {
            throw new NotFound('Entity does not exist or is not available');
        }
        return new SystemTagsObjectMappingCollection(
            $objectId,
            $this->objectType,
            $this->userSession->getUser(),
            $this->tagManager,
            $this->tagMapper
        );
    }

    public function getChildren() {
        // do not list object ids
        throw new MethodNotAllowed();
    }

    /**
     * @param string $name
     */
    public function childExists($name) {
        // TODO: make this more abstract
        if ($this->objectType === 'files') {
            // make sure the object is reachable for the current user
            $userId = $this->userSession->getUser()->getUID();
            $nodes = $this->fileRoot->getUserFolder($userId)->getById((int)$name, true);
            return !empty($nodes);
        }
        return true;
    }

    public function delete() {
        throw new Forbidden('Permission denied to delete this collection');
    }

    public function getName() {
        return $this->objectType;
    }

    /**
     * @param string $name
     */
    public function setName($name) {
        throw new Forbidden('Permission denied to rename this collection');
    }

    /**
     * Returns the last modification time, as a unix timestamp
     *
     * @return int
     */
    public function getLastModified() {
        return null;
    }
}