chrome/browser/net/pref_proxy_config_tracker_impl.h

   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_NET_PREF_PROXY_CONFIG_TRACKER_IMPL_H_
   6 #define CHROME_BROWSER_NET_PREF_PROXY_CONFIG_TRACKER_IMPL_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/observer_list.h"
  12 #include "base/prefs/pref_change_registrar.h"
  13 #include "chrome/browser/net/pref_proxy_config_tracker.h"
  14 #include "chrome/browser/prefs/proxy_config_dictionary.h"
  15 #include "net/proxy/proxy_config.h"
  16 #include "net/proxy/proxy_config_service.h"
  17
  18 class PrefService;
  19 class PrefRegistrySimple;
  20
  21 namespace user_prefs {
  22 class PrefRegistrySyncable;
  23 }
  24
  25 // A net::ProxyConfigService implementation that applies preference proxy
  26 // settings (pushed from PrefProxyConfigTrackerImpl) as overrides to the proxy
  27 // configuration determined by a baseline delegate ProxyConfigService on
  28 // non-ChromeOS platforms. ChromeOS has its own implementation of overrides in
  29 // chromeos::ProxyConfigServiceImpl.
  30 class ChromeProxyConfigService
  31     : public net::ProxyConfigService,
  32       public net::ProxyConfigService::Observer {
  33  public:
  34   // Takes ownership of the passed |base_service|.
  35   // GetLatestProxyConfig returns ConfigAvailability::CONFIG_PENDING until
  36   // UpdateProxyConfig has been called.
  37   explicit ChromeProxyConfigService(net::ProxyConfigService* base_service);
  38   virtual ~ChromeProxyConfigService();
  39
  40   // ProxyConfigService implementation:
  41   virtual void AddObserver(
  42       net::ProxyConfigService::Observer* observer) OVERRIDE;
  43   virtual void RemoveObserver(
  44       net::ProxyConfigService::Observer* observer) OVERRIDE;
  45   virtual ConfigAvailability GetLatestProxyConfig(
  46       net::ProxyConfig* config) OVERRIDE;
  47   virtual void OnLazyPoll() OVERRIDE;
  48
  49   // Method on IO thread that receives the preference proxy settings pushed from
  50   // PrefProxyConfigTrackerImpl.
  51   void UpdateProxyConfig(ProxyPrefs::ConfigState config_state,
  52                          const net::ProxyConfig& config);
  53
  54  private:
  55   // ProxyConfigService::Observer implementation:
  56   virtual void OnProxyConfigChanged(const net::ProxyConfig& config,
  57                                     ConfigAvailability availability) OVERRIDE;
  58
  59   // Makes sure that the observer registration with the base service is set up.
  60   void RegisterObserver();
  61
  62   scoped_ptr<net::ProxyConfigService> base_service_;
  63   ObserverList<net::ProxyConfigService::Observer, true> observers_;
  64
  65   // Tracks configuration state of |pref_config_|. |pref_config_| is valid only
  66   // if |pref_config_state_| is not CONFIG_UNSET.
  67   ProxyPrefs::ConfigState pref_config_state_;
  68
  69   // Configuration as defined by prefs.
  70   net::ProxyConfig pref_config_;
  71
  72   // Flag that indicates that a PrefProxyConfigTracker needs to inform us
  73   // about a proxy configuration before we may return any configuration.
  74   bool pref_config_read_pending_;
  75
  76   // Indicates whether the base service registration is done.
  77   bool registered_observer_;
  78
  79   DISALLOW_COPY_AND_ASSIGN(ChromeProxyConfigService);
  80 };
  81
  82 // A class that tracks proxy preferences. It translates the configuration
  83 // to net::ProxyConfig and pushes the result over to the IO thread for
  84 // ChromeProxyConfigService::UpdateProxyConfig to use.
  85 class PrefProxyConfigTrackerImpl : public PrefProxyConfigTracker {
  86  public:
  87   explicit PrefProxyConfigTrackerImpl(PrefService* pref_service);
  88   virtual ~PrefProxyConfigTrackerImpl();
  89
  90   // PrefProxyConfigTracker implementation:
  91   virtual scoped_ptr<net::ProxyConfigService> CreateTrackingProxyConfigService(
  92       scoped_ptr<net::ProxyConfigService> base_service) OVERRIDE;
  93
  94   // Notifies the tracker that the pref service passed upon construction is
  95   // about to go away. This must be called from the UI thread.
  96   virtual void DetachFromPrefService() OVERRIDE;
  97
  98   // Determines if |config_state| takes precedence regardless, which happens if
  99   // config is from policy or extension or other-precede.
 100   static bool PrefPrecedes(ProxyPrefs::ConfigState config_state);
 101
 102   // Determines the proxy configuration that should take effect in the network
 103   // layer, based on prefs and system configurations.
 104   // |pref_state| refers to state of |pref_config|.
 105   // |system_availability| refers to availability of |system_config|.
 106   // |ignore_fallback_config| indicates if fallback config from prefs should
 107   // be ignored.
 108   // Returns effective |effective_config| and its state in
 109   // |effective_config_source|.
 110   static net::ProxyConfigService::ConfigAvailability GetEffectiveProxyConfig(
 111       ProxyPrefs::ConfigState pref_state,
 112       const net::ProxyConfig& pref_config,
 113       net::ProxyConfigService::ConfigAvailability system_availability,
 114       const net::ProxyConfig& system_config,
 115       bool ignore_fallback_config,
 116       ProxyPrefs::ConfigState* effective_config_state,
 117       net::ProxyConfig* effective_config);
 118
 119   // Converts a ProxyConfigDictionary to net::ProxyConfig representation.
 120   // Returns true if the data from in the dictionary is valid, false otherwise.
 121   static bool PrefConfigToNetConfig(const ProxyConfigDictionary& proxy_dict,
 122                                     net::ProxyConfig* config);
 123
 124   // Registers the proxy preferences. These are actually registered
 125   // the same way in local state and in user prefs.
 126   static void RegisterPrefs(PrefRegistrySimple* registry);
 127   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 128
 129   // Creates a proxy configuration from proxy-related preferences of
 130   // |pref_service|. Configuration is stored in |config|, return value indicates
 131   // whether the configuration is valid.
 132   static ProxyPrefs::ConfigState ReadPrefConfig(const PrefService* pref_service,
 133                                                 net::ProxyConfig* config);
 134
 135  protected:
 136   // Get the proxy configuration currently defined by preferences.
 137   // Status is indicated in the return value.
 138   // Writes the configuration to |config| unless the return value is
 139   // CONFIG_UNSET, in which case |config| and |config_source| are not touched.
 140   ProxyPrefs::ConfigState GetProxyConfig(net::ProxyConfig* config);
 141
 142   // Called when there's a change in prefs proxy config.
 143   // Subclasses can extend it for changes in other sources of proxy config.
 144   virtual void OnProxyConfigChanged(ProxyPrefs::ConfigState config_state,
 145                                     const net::ProxyConfig& config);
 146
 147   void OnProxyPrefChanged();
 148
 149   const PrefService* prefs() const { return pref_service_; }
 150   bool update_pending() const { return update_pending_; }
 151
 152  private:
 153   // Tracks configuration state. |pref_config_| is valid only if |config_state_|
 154   // is not CONFIG_UNSET.
 155   ProxyPrefs::ConfigState config_state_;
 156
 157   // Configuration as defined by prefs.
 158   net::ProxyConfig pref_config_;
 159
 160   PrefService* pref_service_;
 161   ChromeProxyConfigService* chrome_proxy_config_service_;  // Weak ptr.
 162   bool update_pending_;  // True if config has not been pushed to network stack.
 163   PrefChangeRegistrar proxy_prefs_;
 164
 165   DISALLOW_COPY_AND_ASSIGN(PrefProxyConfigTrackerImpl);
 166 };
 167
 168 #endif  // CHROME_BROWSER_NET_PREF_PROXY_CONFIG_TRACKER_IMPL_H_