1 // Copyright (c) 2011 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_UI_WEBUI_APP_LAUNCHER_LOGIN_HANDLER_H_
6 #define CHROME_BROWSER_UI_WEBUI_APP_LAUNCHER_LOGIN_HANDLER_H_
7 
8 #include <memory>
9 
10 #include "base/macros.h"
11 #include "build/build_config.h"
12 #include "content/public/browser/web_ui_message_handler.h"
13 
14 class Profile;
15 class ProfileInfoWatcher;
16 
17 // The login handler currently simply displays the current logged in
18 // username at the top of the NTP (and update itself when that changes).
19 // In the future it may expand to allow users to login from the NTP.
20 class AppLauncherLoginHandler : public content::WebUIMessageHandler {
21  public:
22   AppLauncherLoginHandler();
23   ~AppLauncherLoginHandler() override;
24 
25   // WebUIMessageHandler implementation:
26   void RegisterMessages() override;
27 
28   // Returns true if the login handler should be shown in a new tab page
29   // for the given |profile|. |profile| must not be NULL.
30   static bool ShouldShow(Profile* profile);
31 
32  private:
33   // User actions while on the NTP when clicking on or viewing the sync promo.
34   enum NTPSignInPromoBuckets {
35     NTP_SIGN_IN_PROMO_VIEWED,
36     NTP_SIGN_IN_PROMO_CLICKED,
37     NTP_SIGN_IN_PROMO_BUCKET_BOUNDARY,
38   };
39 
40   // Called from JS when the NTP is loaded. |args| is the list of arguments
41   // passed from JS and should be an empty list.
42   void HandleInitializeSyncLogin(const base::ListValue* args);
43 
44 #if !defined(OS_CHROMEOS)
45   // Called from JS when the user clicks the login container. It shows the
46   // appropriate UI based on the current sync state. |args| is the list of
47   // arguments passed from JS and should be an empty list.
48   void HandleShowSyncLoginUI(const base::ListValue* args);
49 #endif
50 
51   // Records actions in SyncPromo.NTPPromo histogram.
52   void RecordInHistogram(NTPSignInPromoBuckets type);
53 
54   // Internal helper method
55   void UpdateLogin();
56 
57   // Watches this web UI's profile for info changes (e.g. authenticated username
58   // changes).
59   std::unique_ptr<ProfileInfoWatcher> profile_info_watcher_;
60 
61   DISALLOW_COPY_AND_ASSIGN(AppLauncherLoginHandler);
62 };
63 
64 #endif  // CHROME_BROWSER_UI_WEBUI_APP_LAUNCHER_LOGIN_HANDLER_H_
65