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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 "base/callback.h"
#include "base/files/file_path.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "net/url_request/url_fetcher_delegate.h"
namespace net {
class URLFetcher;
class URLRequestContextGetter;
} // namespace net
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 net::URLFetcherDelegate {
public:
typedef base::Callback<void(bool /* success */)> DownloadFinishedCallback;
// 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,
net::URLRequestContextGetter* request_context,
const DownloadFinishedCallback& callback);
~FileDownloader() override;
private:
// net::URLFetcherDelegate implementation.
void OnURLFetchComplete(const net::URLFetcher* source) override;
void OnFileExistsCheckDone(bool exists);
void OnFileMoveDone(bool success);
DownloadFinishedCallback callback_;
scoped_ptr<net::URLFetcher> fetcher_;
base::FilePath local_path_;
base::WeakPtrFactory<FileDownloader> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(FileDownloader);
};
#endif // CHROME_BROWSER_NET_FILE_DOWNLOADER_H_
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