<?php
/**
 * @copyright Copyright (c) 2016, ownCloud, Inc.
 *
 * @author Christoph Wurst <christoph@winzerhof-wurst.at>
 * @author Lukas Reschke <lukas@statuscode.ch>
 * @author Olivier Paroz <github@oparoz.com>
 * @author Robin Appelman <robin@icewind.nl>
 * @author Vincent Petry <vincent@nextcloud.com>
 *
 * @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\External;

use OC\ForbiddenException;
use OCP\Files\NotFoundException;
use OCP\Files\StorageInvalidException;
use OCP\Files\StorageNotAvailableException;

class Scanner extends \OC\Files\Cache\Scanner {
	/** @var \OCA\Files_Sharing\External\Storage */
	protected $storage;

	public function scan($path, $recursive = self::SCAN_RECURSIVE, $reuse = -1, $lock = true) {
		// Disable locking for federated shares
		parent::scan($path, $recursive, $reuse, false);
	}

	/**
	 * Scan a single file and store it in the cache.
	 * If an exception happened while accessing the external storage,
	 * the storage will be checked for availability and removed
	 * if it is not available any more.
	 *
	 * @param string $file file to scan
	 * @param int $reuseExisting
	 * @param int $parentId
	 * @param array | null $cacheData existing data in the cache for the file to be scanned
	 * @param bool $lock set to false to disable getting an additional read lock during scanning
	 * @return array | null an array of metadata of the scanned file
	 */
	public function scanFile($file, $reuseExisting = 0, $parentId = -1, $cacheData = null, $lock = true, $data = null) {
		try {
			return parent::scanFile($file, $reuseExisting, $parentId, $cacheData, $lock, $data);
		} catch (ForbiddenException $e) {
			$this->storage->checkStorageAvailability();
		} catch (NotFoundException $e) {
			// if the storage isn't found, the call to
			// checkStorageAvailable() will verify it and remove it
			// if appropriate
			$this->storage->checkStorageAvailability();
		} catch (StorageInvalidException $e) {
			$this->storage->checkStorageAvailability();
		} catch (StorageNotAvailableException $e) {
			$this->storage->checkStorageAvailability();
		}
	}
}
