chrome/browser/chromeos/login/easy_unlock/short_lived_user_context.h

   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_LOGIN_EASY_UNLOCK_SHORT_LIVED_USER_CONTEXT_H_
   6 #define CHROME_BROWSER_CHROMEOS_LOGIN_EASY_UNLOCK_SHORT_LIVED_USER_CONTEXT_H_
   7
   8 #include "apps/app_lifetime_monitor.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/memory/weak_ptr.h"
  11
  12 namespace base {
  13 class TaskRunner;
  14 }
  15
  16 namespace chromeos {
  17
  18 class UserContext;
  19
  20 // Stores the UserContext of an authentication operation on the sign-in/lock
  21 // screen, which is used to generate the keys for Easy Sign-in.
  22 // The lifetime of the user context is bound the the setup app window. As a
  23 // fail-safe, the user context will also be deleted after a set period of time
  24 // in case the app is left open indefintely.
  25 class ShortLivedUserContext : public apps::AppLifetimeMonitor::Observer {
  26  public:
  27   ShortLivedUserContext(const UserContext& user_context,
  28                         apps::AppLifetimeMonitor* app_lifetime_monitor,
  29                         base::TaskRunner* task_runner);
  30   ~ShortLivedUserContext() override;
  31
  32   // The UserContext returned here can be NULL if its time-to-live has expired.
  33   UserContext* user_context() { return user_context_.get(); }
  34
  35  private:
  36   void Reset();
  37
  38   // apps::AppLifetimeMonitor::Observer:
  39   void OnAppDeactivated(Profile* profile, const std::string& app_id) override;
  40
  41   scoped_ptr<UserContext> user_context_;
  42
  43   apps::AppLifetimeMonitor* app_lifetime_monitor_;
  44
  45   base::WeakPtrFactory<ShortLivedUserContext> weak_ptr_factory_;
  46
  47   DISALLOW_COPY_AND_ASSIGN(ShortLivedUserContext);
  48 };
  49
  50 }  // namespace chromeos
  51
  52 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_EASY_UNLOCK_SHORT_LIVED_USER_CONTEXT_H_