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      1 // Copyright (c) 2012 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_CHROMEOS_LOGIN_NETWORK_STATE_INFORMER_H_
      6 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_NETWORK_STATE_INFORMER_H_
      7 
      8 #include <map>
      9 #include <string>
     10 
     11 #include "base/cancelable_callback.h"
     12 #include "base/compiler_specific.h"
     13 #include "base/memory/ref_counted.h"
     14 #include "base/memory/weak_ptr.h"
     15 #include "base/observer_list.h"
     16 #include "chrome/browser/chromeos/login/screens/error_screen_actor.h"
     17 #include "chrome/browser/chromeos/login/ui/captive_portal_window_proxy.h"
     18 #include "chrome/browser/chromeos/net/network_portal_detector.h"
     19 #include "chromeos/network/network_state_handler_observer.h"
     20 #include "content/public/browser/notification_observer.h"
     21 #include "content/public/browser/notification_registrar.h"
     22 #include "content/public/browser/notification_service.h"
     23 
     24 namespace chromeos {
     25 
     26 // Class which observes network state changes and calls registered callbacks.
     27 // State is considered changed if connection or the active network has been
     28 // changed. Also, it answers to the requests about current network state.
     29 class NetworkStateInformer
     30     : public chromeos::NetworkStateHandlerObserver,
     31       public chromeos::NetworkPortalDetector::Observer,
     32       public content::NotificationObserver,
     33       public CaptivePortalWindowProxyDelegate,
     34       public base::RefCounted<NetworkStateInformer> {
     35  public:
     36   enum State {
     37     OFFLINE = 0,
     38     ONLINE,
     39     CAPTIVE_PORTAL,
     40     CONNECTING,
     41     PROXY_AUTH_REQUIRED,
     42     UNKNOWN
     43   };
     44 
     45   class NetworkStateInformerObserver {
     46    public:
     47     NetworkStateInformerObserver() {}
     48     virtual ~NetworkStateInformerObserver() {}
     49 
     50     virtual void UpdateState(ErrorScreenActor::ErrorReason reason) = 0;
     51     virtual void OnNetworkReady() {}
     52   };
     53 
     54   NetworkStateInformer();
     55 
     56   void Init();
     57 
     58   // Adds observer to be notified when network state has been changed.
     59   void AddObserver(NetworkStateInformerObserver* observer);
     60 
     61   // Removes observer.
     62   void RemoveObserver(NetworkStateInformerObserver* observer);
     63 
     64   // NetworkStateHandlerObserver implementation:
     65   virtual void DefaultNetworkChanged(const NetworkState* network) OVERRIDE;
     66 
     67   // NetworkPortalDetector::Observer implementation:
     68   virtual void OnPortalDetectionCompleted(
     69       const NetworkState* network,
     70       const NetworkPortalDetector::CaptivePortalState& state) OVERRIDE;
     71 
     72   // content::NotificationObserver implementation.
     73   virtual void Observe(int type,
     74                        const content::NotificationSource& source,
     75                        const content::NotificationDetails& details) OVERRIDE;
     76 
     77   // CaptivePortalWindowProxyDelegate implementation:
     78   virtual void OnPortalDetected() OVERRIDE;
     79 
     80   State state() const { return state_; }
     81   std::string network_path() const { return network_path_; }
     82   std::string network_type() const { return network_type_; }
     83 
     84   static const char* StatusString(State state);
     85 
     86  private:
     87   friend class base::RefCounted<NetworkStateInformer>;
     88 
     89   virtual ~NetworkStateInformer();
     90 
     91   bool UpdateState();
     92 
     93   void UpdateStateAndNotify();
     94 
     95   void SendStateToObservers(ErrorScreenActor::ErrorReason reason);
     96 
     97   State state_;
     98   std::string network_path_;
     99   std::string network_type_;
    100 
    101   ObserverList<NetworkStateInformerObserver> observers_;
    102   content::NotificationRegistrar registrar_;
    103 
    104   base::WeakPtrFactory<NetworkStateInformer> weak_ptr_factory_;
    105 };
    106 
    107 }  // namespace chromeos
    108 
    109 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_NETWORK_STATE_INFORMER_H_
    110