chrome.settingsPrivate: Implement onPrefsChanged event handling.

chrome/browser/extensions/api/settings_private/settings_private_delegate.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/api/settings_private/settings_private_delegate.h"
 
 #include "base/json/json_reader.h"
 #include "base/prefs/pref_service.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
+#include "chrome/browser/extensions/api/settings_private/prefs_util.h"
+#include "chrome/browser/profiles/profile.h"
 #include "chrome/common/pref_names.h"
 #include "components/url_fixer/url_fixer.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/common/extension.h"
 #include "url/gurl.h"
 
 namespace extensions {
 
 namespace settings_private = api::settings_private;
 
-namespace {
-
-// NOTE: Consider moving this function to a separate file, e.g. in
-// chrome/browser/prefs.
-bool IsPrefUserModifiable(Profile* profile,
-                          PrefService* pref_service,
-                          const std::string& pref_name) {
-  if (pref_name != prefs::kBrowserGuestModeEnabled &&
-      pref_name != prefs::kBrowserAddPersonEnabled) {
-    return true;
-  }
-
-  const PrefService::Preference* pref =
-      pref_service->FindPreference(pref_name.c_str());
-  if (!pref || !pref->IsUserModifiable() || profile->IsSupervised())
-    return false;
-
-  return true;
-}
-
-const TypedPrefMap& GetWhitelistedKeys() {
-  static TypedPrefMap* s_whitelist = nullptr;
-  if (s_whitelist)
-    return *s_whitelist;
-  s_whitelist = new TypedPrefMap();
-  (*s_whitelist)["download.default_directory"] =
-      settings_private::PrefType::PREF_TYPE_STRING;
-  (*s_whitelist)["download.prompt_for_download"] =
-      settings_private::PrefType::PREF_TYPE_BOOLEAN;
-  (*s_whitelist)["homepage"] =
-      settings_private::PrefType::PREF_TYPE_URL;
-  return *s_whitelist;
-}
-
-#if defined(OS_CHROMEOS)
-const TypedPrefMap& GetWhitelistedCrosKeys() {
-  static TypedPrefMap* s_whitelist = nullptr;
-  if (s_whitelist)
-    return *s_whitelist;
-  s_whitelist = new TypedPrefMap();
-  (*s_whitelist)["settings.accessibility"] =
-      settings_private::PrefType::PREF_TYPE_BOOLEAN;
-  (*s_whitelist)["settings.a11y.autoclick"] =
-      settings_private::PrefType::PREF_TYPE_BOOLEAN;
-  (*s_whitelist)["settings.a11y.autoclick_delay_ms"] =
-      settings_private::PrefType::PREF_TYPE_BOOLEAN;
-  (*s_whitelist)["settings.a11y.enable_menu"] =
-      settings_private::PrefType::PREF_TYPE_BOOLEAN;
-  (*s_whitelist)["settings.a11y.high_contrast_enabled"] =
-      settings_private::PrefType::PREF_TYPE_BOOLEAN;
-  (*s_whitelist)["settings.a11y.large_cursor_enabled"] =
-      settings_private::PrefType::PREF_TYPE_BOOLEAN;
-  (*s_whitelist)["settings.a11y.screen_magnifier"] =
-      settings_private::PrefType::PREF_TYPE_BOOLEAN;
-  (*s_whitelist)["settings.a11y.sticky_keys_enabled"] =
-      settings_private::PrefType::PREF_TYPE_BOOLEAN;
-  (*s_whitelist)["settings.a11y.virtual_keyboard"] =
-      settings_private::PrefType::PREF_TYPE_BOOLEAN;
-  (*s_whitelist)["settings.touchpad.enable_tap_dragging"] =
-      settings_private::PrefType::PREF_TYPE_BOOLEAN;
-  return *s_whitelist;
-}
-#endif
-
-bool IsPrefTypeURL(const std::string& pref_name) {
-  settings_private::PrefType pref_type =
-      settings_private::PrefType::PREF_TYPE_NONE;
-
-  const TypedPrefMap keys = GetWhitelistedKeys();
-  const auto& iter = keys.find(pref_name);
-  if (iter != keys.end()) {
-    pref_type = iter->second;
-  }
-
-#if defined(OS_CHROMEOS)
-  const TypedPrefMap cros_keys = GetWhitelistedCrosKeys();
-  const auto& cros_iter = cros_keys.find(pref_name);
-  if (cros_iter != cros_keys.end()) {
-    pref_type = cros_iter->second;
-  }
-#endif
-
-  return pref_type == settings_private::PrefType::PREF_TYPE_URL;
-}
-
-}  // namespace
-
 SettingsPrivateDelegate::SettingsPrivateDelegate(Profile* profile)
     : profile_(profile) {
 }
 
 SettingsPrivateDelegate::~SettingsPrivateDelegate() {
 }
 
 scoped_ptr<base::Value> SettingsPrivateDelegate::GetPref(
     const std::string& name) {
-  PrefService* pref_service = profile_->GetPrefs();
-  const PrefService::Preference* pref = pref_service->FindPreference(name);
-  if (!pref)
-    return make_scoped_ptr(base::Value::CreateNullValue());
-
-  api::settings_private::PrefObject* pref_object =
-      new api::settings_private::PrefObject();
-  pref_object->key = pref->name();
-  switch (pref->GetType()) {
-    case base::Value::Type::TYPE_BOOLEAN:
-      pref_object->type = api::settings_private::PrefType::PREF_TYPE_BOOLEAN;
-      break;
-    case base::Value::Type::TYPE_INTEGER:
-    case base::Value::Type::TYPE_DOUBLE:
-      pref_object->type = api::settings_private::PrefType::PREF_TYPE_NUMBER;
-      break;
-    case base::Value::Type::TYPE_STRING:
-      pref_object->type = IsPrefTypeURL(name)
-          ? api::settings_private::PrefType::PREF_TYPE_URL
-          : api::settings_private::PrefType::PREF_TYPE_STRING;
-      break;
-    case base::Value::Type::TYPE_LIST:
-      pref_object->type = api::settings_private::PrefType::PREF_TYPE_LIST;
-      break;
-    default:
-      break;
-  }
-
-  pref_object->value.reset(pref->GetValue()->DeepCopy());
-
-  if (pref->IsManaged()) {
-    if (pref->IsManagedByCustodian()) {
-      pref_object->policy_source =
-          api::settings_private::PolicySource::POLICY_SOURCE_DEVICE;
-    } else {
-      pref_object->policy_source =
-          api::settings_private::PolicySource::POLICY_SOURCE_USER;
-    }
-    pref_object->policy_enforcement =
-        pref->IsRecommended() ? api::settings_private::PolicyEnforcement::
-                                    POLICY_ENFORCEMENT_RECOMMENDED
-                              : api::settings_private::PolicyEnforcement::
-                                    POLICY_ENFORCEMENT_ENFORCED;
-  } else if (!IsPrefUserModifiable(profile_, pref_service, name)) {
-    pref_object->policy_source =
-        api::settings_private::PolicySource::POLICY_SOURCE_USER;
-    pref_object->policy_enforcement =
-        api::settings_private::PolicyEnforcement::POLICY_ENFORCEMENT_ENFORCED;
-  }
-
-  return pref_object->ToValue();
+  return prefs_util::GetPref(profile_, name)->ToValue();
 }
 
 scoped_ptr<base::Value> SettingsPrivateDelegate::GetAllPrefs() {
   scoped_ptr<base::ListValue> prefs(new base::ListValue());
 
-  const TypedPrefMap& keys = GetWhitelistedKeys();
+  const TypedPrefMap& keys = prefs_util::GetWhitelistedKeys();
   for (const auto& it : keys) {
     prefs->Append(GetPref(it.first).release());
   }
 
-#if defined(OS_CHROMEOS)
-  const TypedPrefMap cros_keys = GetWhitelistedCrosKeys();
-  for (const auto& it : cros_keys) {
-    prefs->Append(GetPref(it.first).release());
-  }
-#endif
-
   return prefs.Pass();
 }
 
-PrefService* SettingsPrivateDelegate::FindServiceForPref(
-    const std::string& pref_name) {
-  PrefService* user_prefs = profile_->GetPrefs();
-
-  // Proxy is a peculiar case: on ChromeOS, settings exist in both user
-  // prefs and local state, but chrome://settings should affect only user prefs.
-  // Elsewhere the proxy settings are stored in local state.
-  // See http://crbug.com/157147
-
-  if (pref_name == prefs::kProxy) {
-#if defined(OS_CHROMEOS)
-    return user_prefs;
-#else
-    return g_browser_process->local_state();
-#endif
-  }
-
-  // Find which PrefService contains the given pref. Pref names should not
-  // be duplicated across services, however if they are, prefer the user's
-  // prefs.
-  if (user_prefs->FindPreference(pref_name))
-    return user_prefs;
-
-  if (g_browser_process->local_state()->FindPreference(pref_name))
-    return g_browser_process->local_state();
-
-  return user_prefs;
-}
-
 bool SettingsPrivateDelegate::SetPref(const std::string& pref_name,
                                       const base::Value* value) {
-  PrefService* pref_service = FindServiceForPref(pref_name);
+  PrefService* pref_service =
+      prefs_util::FindServiceForPref(profile_, pref_name);
 
-  if (!IsPrefUserModifiable(profile_, pref_service, pref_name))
+  if (!prefs_util::IsPrefUserModifiable(profile_, pref_name))
     return false;
 
   const PrefService::Preference* pref =
       pref_service->FindPreference(pref_name.c_str());
   if (!pref)
     return false;
 
   DCHECK_EQ(pref->GetType(), value->GetType());
 
   scoped_ptr<base::Value> temp_value;
 
   switch (pref->GetType()) {
     case base::Value::TYPE_INTEGER: {
       // In JS all numbers are doubles.
       double double_value;
       if (!value->GetAsDouble(&double_value))
         return false;
 
       int int_value = static_cast<int>(double_value);
       temp_value.reset(new base::FundamentalValue(int_value));
       value = temp_value.get();
       break;
     }
     case base::Value::TYPE_STRING: {
       std::string original;
       if (!value->GetAsString(&original))
         return false;
 
-      if (IsPrefTypeURL(pref_name)) {
+      if (prefs_util::IsPrefTypeURL(pref_name)) {
         GURL fixed = url_fixer::FixupURL(original, std::string());
         temp_value.reset(new base::StringValue(fixed.spec()));
         value = temp_value.get();
       }
       break;
     }
     case base::Value::TYPE_LIST: {
       // In case we have a List pref we got a JSON string.
       std::string json_string;
       if (!value->GetAsString(&json_string))
@@ skipping 13 matching lines @@
       return false;
   }
 
   // TODO(orenb): Process setting metrics here (like "ProcessUserMetric" in
   // CoreOptionsHandler).
   pref_service->Set(pref_name.c_str(), *value);
   return true;
 }
 
 }  // namespace extensions