1 files changed, 72 insertions, 0 deletions
diff --git a/chromium/chrome/browser/net/file_downloader.h b/chromium/chrome/browser/net/file_downloader.h
new file mode 100644
index 00000000000..17bc38348fb
--- /dev/null
+++ b/chromium/chrome/browser/net/file_downloader.h
@@ -0,0 +1,72 @@
+// 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_