nextcloud-server/lib/public/AppFramework/Http/StreamResponse.php

<?php
/**
 * @copyright Copyright (c) 2016, ownCloud, Inc.
 *
 * @author Bernhard Posselt <dev@bernhard-posselt.com>
 * @author Christoph Wurst <christoph@winzerhof-wurst.at>
 * @author Lukas Reschke <lukas@statuscode.ch>
 * @author Morris Jobke <hey@morrisjobke.de>
 * @author Robin Appelman <robin@icewind.nl>
 * @author Roeland Jago Douma <roeland@famdouma.nl>
 * @author Kate Döen <kate.doeen@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 OCP\AppFramework\Http;

use OCP\AppFramework\Http;

/**
 * Class StreamResponse
 *
 * @since 8.1.0
 * @template S of int
 * @template H of array<string, mixed>
 * @template-extends Response<int, array<string, mixed>>
 */
class StreamResponse extends Response implements ICallbackResponse {
	/** @var string */
	private $filePath;

	/**
	 * @param string|resource $filePath the path to the file or a file handle which should be streamed
	 * @param S $status
	 * @param H $headers
	 * @since 8.1.0
	 */
	public function __construct(mixed $filePath, int $status = Http::STATUS_OK, array $headers = []) {
		parent::__construct($status, $headers);

		$this->filePath = $filePath;
	}


	/**
	 * Streams the file using readfile
	 *
	 * @param IOutput $output a small wrapper that handles output
	 * @since 8.1.0
	 */
	public function callback(IOutput $output) {
		// handle caching
		if ($output->getHttpResponseCode() !== Http::STATUS_NOT_MODIFIED) {
			if (!(is_resource($this->filePath) || file_exists($this->filePath))) {
				$output->setHttpResponseCode(Http::STATUS_NOT_FOUND);
			} elseif ($output->setReadfile($this->filePath) === false) {
				$output->setHttpResponseCode(Http::STATUS_BAD_REQUEST);
			}
		}
	}
}