owncloud/core

<?php
/**
 * @author Joas Schilling <coding@schilljs.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\Files;

use OCP\Files\Folder;
use OCP\ITagManager;

class ActivityHelper {
    /** If a user has a lot of favorites the query might get too slow and long */
    public const FAVORITE_LIMIT = 50;

    /** @var \OCP\ITagManager */
    protected $tagManager;

    /**
     * @param ITagManager $tagManager
     */
    public function __construct(ITagManager $tagManager) {
        $this->tagManager = $tagManager;
    }

    /**
     * Returns an array with the favorites
     *
     * @param string $user
     * @return array
     * @throws \RuntimeException when too many or no favorites where found
     */
    public function getFavoriteFilePaths($user) {
        $tags = $this->tagManager->load('files', [], false, $user);
        $favorites = $tags->getFavorites();

        if (empty($favorites)) {
            throw new \RuntimeException('No favorites', 1);
        } elseif (isset($favorites[self::FAVORITE_LIMIT])) {
            throw new \RuntimeException('Too many favorites', 2);
        }

        // Can not DI because the user is not known on instantiation
        $rootFolder = \OC::$server->getUserFolder($user);
        $folders = $items = [];
        foreach ($favorites as $favorite) {
            $nodes = $rootFolder->getById($favorite, true);
            $node = $nodes[0] ?? null;
            if ($node) {
                $path = \substr($node->getPath(), \strlen($user . '/files/'));

                $items[] = $path;
                if ($node instanceof Folder) {
                    $folders[] = $path;
                }
            }
        }

        if (empty($items)) {
            throw new \RuntimeException('No favorites', 1);
        }

        return [
            'items' => $items,
            'folders' => $folders,
        ];
    }
}