customization_wallpaper_downloader.h revision 0529e5d033099cbfc42635f6f6183833b09dff6e 
1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef CHROME_BROWSER_CHROMEOS_CUSTOMIZATION_WALLPAPER_DOWNLOADER_H_
6#define CHROME_BROWSER_CHROMEOS_CUSTOMIZATION_WALLPAPER_DOWNLOADER_H_
7
8#include <string>
9
10#include "base/bind.h"
11#include "base/files/file_path.h"
12#include "base/macros.h"
13#include "base/memory/weak_ptr.h"
14#include "base/time/time.h"
15#include "base/timer/timer.h"
16#include "net/url_request/url_fetcher_delegate.h"
17#include "url/gurl.h"
18
19namespace net {
20class URLRequestContextGetter;
21}  // namespace net
22
23namespace chromeos {
24
25// Download customized wallpaper.
26// Owner of this class must provide callback, which will be called on
27// finished (either successful or failed) wallpaper download.
28class CustomizationWallpaperDownloader : public net::URLFetcherDelegate {
29 public:
30  // - |url_context_getter| - Context to initialize net::URLFetcher.
31  // - |wallpaper_url| - wallpaper URL to download.
32  // - |wallpaper_dir| - directory, where wallpaper will be downloaded
33  // (it will be created).
34  // - |wallpaper_downloaded_file| - full path to local file to store downloaded
35  // wallpaper file. File is downloaded to temporary location
36  // |wallpaper_downloaded_file| + ".tmp", so directory must be writable.
37  // After download is completed, temporary file will be renamed to
38  // |wallpaper_downloaded_file|.
39  CustomizationWallpaperDownloader(
40      net::URLRequestContextGetter* url_context_getter,
41      const GURL& wallpaper_url,
42      const base::FilePath& wallpaper_dir,
43      const base::FilePath& wallpaper_downloaded_file,
44      base::Callback<void(bool success, const GURL&)>
45          on_wallpaper_fetch_completed);
46
47  virtual ~CustomizationWallpaperDownloader();
48
49  // Start download.
50  void Start();
51
52  // net::URLFetcherDelegate
53  virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
54
55 private:
56  // Start new request.
57  void StartRequest();
58
59  // Schedules retry.
60  void Retry();
61
62  // Called on UI thread.
63  void OnWallpaperDirectoryCreated(scoped_ptr<bool> success);
64
65  // Called on UI thread.
66  void OnTemporaryFileRenamed(scoped_ptr<bool> success);
67
68  // This is used to initialize net::URLFetcher object.
69  scoped_refptr<net::URLRequestContextGetter> url_context_getter_;
70
71  // This fetcher is used to download wallpaper file.
72  scoped_ptr<net::URLFetcher> url_fetcher_;
73
74  // The wallpaper URL to fetch.
75  const GURL wallpaper_url_;
76
77  // Wallpaper directory (to be created).
78  const base::FilePath wallpaper_dir_;
79
80  // Full path to local file to save downloaded wallpaper.
81  const base::FilePath wallpaper_downloaded_file_;
82
83  // Full path to temporary file to fetch downloaded wallpper.
84  const base::FilePath wallpaper_temporary_file_;
85
86  // Pending retry.
87  base::OneShotTimer<CustomizationWallpaperDownloader> request_scheduled_;
88
89  // Number of download retries (first attempt is not counted as retry).
90  size_t retries_;
91
92  // Callback supplied by caller.
93  base::Callback<void(bool success, const GURL&)> on_wallpaper_fetch_completed_;
94
95  base::WeakPtrFactory<CustomizationWallpaperDownloader> weak_factory_;
96
97  DISALLOW_COPY_AND_ASSIGN(CustomizationWallpaperDownloader);
98};
99
100}  //   namespace chromeos
101
102#endif  // CHROME_BROWSER_CHROMEOS_CUSTOMIZATION_WALLPAPER_DOWNLOADER_H_
103