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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_NET_FILE_DOWNLOADER_H_
#define CHROME_BROWSER_NET_FILE_DOWNLOADER_H_
#include <memory>
#include "base/callback.h"
#include "base/files/file_path.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "net/traffic_annotation/network_traffic_annotation.h"
namespace network {
class SimpleURLLoader;
class SharedURLLoaderFactory;
} // namespace network
class GURL;
// Helper class to download a file from a given URL and store it in a local
// file. If |overwrite| is true, any existing file will be overwritten;
// otherwise if the local file already exists, this will report success without
// downloading anything.
class FileDownloader {
public:
enum Result {
// The file was successfully downloaded.
DOWNLOADED,
// A local file at the given path already existed and was kept.
EXISTS,
// Downloading failed.
FAILED
};
using DownloadFinishedCallback = base::OnceCallback<void(Result)>;
// Directly starts the download (if necessary) and runs |callback| when done.
// If the instance is destroyed before it is finished, |callback| is not run.
FileDownloader(
const GURL& url,
const base::FilePath& path,
bool overwrite,
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory,
DownloadFinishedCallback callback,
const net::NetworkTrafficAnnotationTag& traffic_annotation);
~FileDownloader();
static bool IsSuccess(Result result) { return result != FAILED; }
private:
void OnSimpleDownloadComplete(base::FilePath response_path);
void OnFileExistsCheckDone(bool exists);
void OnFileMoveDone(bool success);
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory_;
DownloadFinishedCallback callback_;
std::unique_ptr<network::SimpleURLLoader> simple_url_loader_;
base::FilePath local_path_;
base::WeakPtrFactory<FileDownloader> weak_ptr_factory_{this};
DISALLOW_COPY_AND_ASSIGN(FileDownloader);
};
#endif // CHROME_BROWSER_NET_FILE_DOWNLOADER_H_
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