src/chrome/browser/ui/webui/options/core_options_handler.cc

   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 #include "chrome/browser/ui/webui/options/core_options_handler.h"
   6
   7 #include "base/bind.h"
   8 #include "base/bind_helpers.h"
   9 #include "base/json/json_reader.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/strings/string16.h"
  12 #include "base/strings/string_number_conversions.h"
  13 #include "base/strings/utf_string_conversions.h"
  14 #include "base/values.h"
  15 #include "chrome/browser/browser_process.h"
  16 #include "chrome/browser/chrome_notification_types.h"
  17 #include "chrome/browser/extensions/extension_service.h"
  18 #include "chrome/browser/extensions/extension_util.h"
  19 #include "chrome/browser/profiles/profile.h"
  20 #include "chrome/browser/ui/webui/help/help_handler.h"
  21 #include "chrome/common/chrome_switches.h"
  22 #include "chrome/common/pref_names.h"
  23 #include "chrome/common/url_constants.h"
  24 #include "chrome/grit/chromium_strings.h"
  25 #include "chrome/grit/generated_resources.h"
  26 #include "chrome/grit/locale_settings.h"
  27 #include "components/url_fixer/url_fixer.h"
  28 #include "content/public/browser/notification_details.h"
  29 #include "content/public/browser/notification_types.h"
  30 #include "content/public/browser/user_metrics.h"
  31 #include "content/public/browser/web_ui.h"
  32 #include "extensions/browser/extension_pref_value_map.h"
  33 #include "extensions/browser/extension_pref_value_map_factory.h"
  34 #include "extensions/browser/extension_registry.h"
  35 #include "extensions/browser/extension_system.h"
  36 #include "extensions/common/extension.h"
  37 #include "grit/components_strings.h"
  38 #include "ui/base/l10n/l10n_util.h"
  39 #include "url/gurl.h"
  40
  41 using base::UserMetricsAction;
  42
  43 namespace options {
  44
  45 namespace {
  46
  47 // Whether "controlledBy" property of pref value sent to options web UI needs to
  48 // be set to "extension" when the preference is controlled by an extension.
  49 bool CanSetExtensionControlledPrefValue(
  50     const PrefService::Preference* preference) {
  51 #if defined(OS_WIN)
  52   // These have more obvious UI than the standard one for extension controlled
  53   // values (an extension puzzle piece) on the settings page. To avoiding
  54   // showing the extension puzzle piece for these settings, their "controlledBy"
  55   // value should never be set to "extension".
  56   return preference->name() != prefs::kURLsToRestoreOnStartup &&
  57          preference->name() != prefs::kRestoreOnStartup &&
  58          preference->name() != prefs::kHomePage &&
  59          preference->name() != prefs::kHomePageIsNewTabPage;
  60 #else
  61   return true;
  62 #endif
  63 }
  64
  65 }  // namespace
  66
  67 CoreOptionsHandler::CoreOptionsHandler()
  68     : handlers_host_(NULL) {
  69 }
  70
  71 CoreOptionsHandler::~CoreOptionsHandler() {}
  72
  73 void CoreOptionsHandler::InitializeHandler() {
  74   Profile* profile = Profile::FromWebUI(web_ui());
  75
  76   plugin_status_pref_setter_.Init(
  77       profile,
  78       base::Bind(&CoreOptionsHandler::OnPreferenceChanged,
  79                  base::Unretained(this),
  80                  profile->GetPrefs()));
  81
  82   pref_change_filters_[prefs::kBrowserGuestModeEnabled] =
  83       base::Bind(&CoreOptionsHandler::IsUserUnsupervised,
  84                  base::Unretained(this));
  85   pref_change_filters_[prefs::kBrowserAddPersonEnabled] =
  86       base::Bind(&CoreOptionsHandler::IsUserUnsupervised,
  87                  base::Unretained(this));
  88 }
  89
  90 void CoreOptionsHandler::InitializePage() {
  91   UpdateClearPluginLSOData();
  92   UpdatePepperFlashSettingsEnabled();
  93 }
  94
  95 void CoreOptionsHandler::GetLocalizedValues(
  96     base::DictionaryValue* localized_strings) {
  97   GetStaticLocalizedValues(localized_strings);
  98 }
  99
 100 void CoreOptionsHandler::GetStaticLocalizedValues(
 101     base::DictionaryValue* localized_strings) {
 102   DCHECK(localized_strings);
 103   // Main
 104   localized_strings->SetString("optionsPageTitle",
 105       l10n_util::GetStringUTF16(IDS_SETTINGS_TITLE));
 106
 107   // Controlled settings bubble.
 108   localized_strings->SetString("controlledSettingPolicy",
 109       l10n_util::GetStringUTF16(IDS_OPTIONS_CONTROLLED_SETTING_POLICY));
 110   localized_strings->SetString("controlledSettingExtension",
 111       l10n_util::GetStringUTF16(IDS_OPTIONS_CONTROLLED_SETTING_EXTENSION));
 112   localized_strings->SetString("controlledSettingExtensionWithName",
 113       l10n_util::GetStringUTF16(
 114           IDS_OPTIONS_CONTROLLED_SETTING_EXTENSION_WITH_NAME));
 115   localized_strings->SetString("controlledSettingManageExtension",
 116       l10n_util::GetStringUTF16(
 117           IDS_OPTIONS_CONTROLLED_SETTING_MANAGE_EXTENSION));
 118   localized_strings->SetString("controlledSettingDisableExtension",
 119       l10n_util::GetStringUTF16(IDS_EXTENSIONS_DISABLE));
 120   localized_strings->SetString("controlledSettingRecommended",
 121       l10n_util::GetStringUTF16(IDS_OPTIONS_CONTROLLED_SETTING_RECOMMENDED));
 122   localized_strings->SetString("controlledSettingHasRecommendation",
 123       l10n_util::GetStringUTF16(
 124           IDS_OPTIONS_CONTROLLED_SETTING_HAS_RECOMMENDATION));
 125   localized_strings->SetString("controlledSettingFollowRecommendation",
 126       l10n_util::GetStringUTF16(
 127           IDS_OPTIONS_CONTROLLED_SETTING_FOLLOW_RECOMMENDATION));
 128   localized_strings->SetString("controlledSettingsPolicy",
 129       l10n_util::GetStringUTF16(IDS_OPTIONS_CONTROLLED_SETTINGS_POLICY));
 130   localized_strings->SetString("controlledSettingsExtension",
 131       l10n_util::GetStringUTF16(IDS_OPTIONS_CONTROLLED_SETTINGS_EXTENSION));
 132   localized_strings->SetString("controlledSettingsExtensionWithName",
 133       l10n_util::GetStringUTF16(
 134           IDS_OPTIONS_CONTROLLED_SETTINGS_EXTENSION_WITH_NAME));
 135
 136   // Search
 137   RegisterTitle(localized_strings, "searchPage", IDS_OPTIONS_SEARCH_PAGE_TITLE);
 138   localized_strings->SetString("searchPlaceholder",
 139       l10n_util::GetStringUTF16(IDS_OPTIONS_SEARCH_PLACEHOLDER));
 140   localized_strings->SetString("searchPageNoMatches",
 141       l10n_util::GetStringUTF16(IDS_OPTIONS_SEARCH_PAGE_NO_MATCHES));
 142   localized_strings->SetString("searchPageHelpLabel",
 143       l10n_util::GetStringUTF16(IDS_OPTIONS_SEARCH_PAGE_HELP_LABEL));
 144   localized_strings->SetString("searchPageHelpTitle",
 145       l10n_util::GetStringFUTF16(IDS_OPTIONS_SEARCH_PAGE_HELP_TITLE,
 146           l10n_util::GetStringUTF16(IDS_PRODUCT_NAME)));
 147   localized_strings->SetString("searchPageHelpURL",
 148                                chrome::kSettingsSearchHelpURL);
 149
 150   // Common
 151   localized_strings->SetString("ok",
 152       l10n_util::GetStringUTF16(IDS_OK));
 153   localized_strings->SetString("cancel",
 154       l10n_util::GetStringUTF16(IDS_CANCEL));
 155   localized_strings->SetString("learnMore",
 156       l10n_util::GetStringUTF16(IDS_LEARN_MORE));
 157   localized_strings->SetString("close",
 158       l10n_util::GetStringUTF16(IDS_CLOSE));
 159   localized_strings->SetString("done",
 160       l10n_util::GetStringUTF16(IDS_DONE));
 161   localized_strings->SetString("deletableItemDeleteButtonTitle",
 162       l10n_util::GetStringUTF16(IDS_OPTIONS_DELETABLE_ITEM_DELETE_BUTTON));
 163   localized_strings->SetString(
 164       "browserVersion",
 165       l10n_util::GetStringFUTF16(IDS_ABOUT_PRODUCT_VERSION,
 166                                  HelpHandler::BuildBrowserVersionString()));
 167   localized_strings->SetBoolean("showVersion",
 168                                 switches::AboutInSettingsEnabled());
 169 }
 170
 171 void CoreOptionsHandler::Uninitialize() {
 172   std::string last_pref;
 173   for (PreferenceCallbackMap::const_iterator iter = pref_callback_map_.begin();
 174        iter != pref_callback_map_.end();
 175        ++iter) {
 176     if (last_pref != iter->first) {
 177       StopObservingPref(iter->first);
 178       last_pref = iter->first;
 179     }
 180   }
 181 }
 182
 183 void CoreOptionsHandler::OnPreferenceChanged(PrefService* service,
 184                                              const std::string& pref_name) {
 185   if (pref_name == prefs::kClearPluginLSODataEnabled) {
 186     // This preference is stored in Local State, not in the user preferences.
 187     UpdateClearPluginLSOData();
 188     return;
 189   }
 190   if (pref_name == prefs::kPepperFlashSettingsEnabled) {
 191     UpdatePepperFlashSettingsEnabled();
 192     return;
 193   }
 194   NotifyPrefChanged(pref_name, std::string());
 195 }
 196
 197 void CoreOptionsHandler::RegisterMessages() {
 198   registrar_.Init(Profile::FromWebUI(web_ui())->GetPrefs());
 199   local_state_registrar_.Init(g_browser_process->local_state());
 200
 201   web_ui()->RegisterMessageCallback("coreOptionsInitialize",
 202       base::Bind(&CoreOptionsHandler::HandleInitialize,
 203                  base::Unretained(this)));
 204   web_ui()->RegisterMessageCallback("onFinishedLoadingOptions",
 205       base::Bind(&CoreOptionsHandler::OnFinishedLoading,
 206                  base::Unretained(this)));
 207   web_ui()->RegisterMessageCallback("fetchPrefs",
 208       base::Bind(&CoreOptionsHandler::HandleFetchPrefs,
 209                  base::Unretained(this)));
 210   web_ui()->RegisterMessageCallback("observePrefs",
 211       base::Bind(&CoreOptionsHandler::HandleObservePrefs,
 212                  base::Unretained(this)));
 213   web_ui()->RegisterMessageCallback("setBooleanPref",
 214       base::Bind(&CoreOptionsHandler::HandleSetBooleanPref,
 215                  base::Unretained(this)));
 216   web_ui()->RegisterMessageCallback("setIntegerPref",
 217       base::Bind(&CoreOptionsHandler::HandleSetIntegerPref,
 218                  base::Unretained(this)));
 219   web_ui()->RegisterMessageCallback("setDoublePref",
 220       base::Bind(&CoreOptionsHandler::HandleSetDoublePref,
 221                  base::Unretained(this)));
 222   web_ui()->RegisterMessageCallback("setStringPref",
 223       base::Bind(&CoreOptionsHandler::HandleSetStringPref,
 224                  base::Unretained(this)));
 225   web_ui()->RegisterMessageCallback("setURLPref",
 226       base::Bind(&CoreOptionsHandler::HandleSetURLPref,
 227                  base::Unretained(this)));
 228   web_ui()->RegisterMessageCallback("setListPref",
 229       base::Bind(&CoreOptionsHandler::HandleSetListPref,
 230                  base::Unretained(this)));
 231   web_ui()->RegisterMessageCallback("clearPref",
 232       base::Bind(&CoreOptionsHandler::HandleClearPref,
 233                  base::Unretained(this)));
 234   web_ui()->RegisterMessageCallback("coreOptionsUserMetricsAction",
 235       base::Bind(&CoreOptionsHandler::HandleUserMetricsAction,
 236                  base::Unretained(this)));
 237   web_ui()->RegisterMessageCallback("disableExtension",
 238       base::Bind(&CoreOptionsHandler::HandleDisableExtension,
 239                  base::Unretained(this)));
 240 }
 241
 242 void CoreOptionsHandler::HandleInitialize(const base::ListValue* args) {
 243   DCHECK(handlers_host_);
 244   handlers_host_->InitializeHandlers();
 245 }
 246
 247 void CoreOptionsHandler::OnFinishedLoading(const base::ListValue* args) {
 248   DCHECK(handlers_host_);
 249   handlers_host_->OnFinishedLoading();
 250 }
 251
 252 base::Value* CoreOptionsHandler::FetchPref(const std::string& pref_name) {
 253   return CreateValueForPref(pref_name, std::string());
 254 }
 255
 256 void CoreOptionsHandler::ObservePref(const std::string& pref_name) {
 257   if (g_browser_process->local_state()->FindPreference(pref_name.c_str())) {
 258     local_state_registrar_.Add(
 259         pref_name.c_str(),
 260         base::Bind(&CoreOptionsHandler::OnPreferenceChanged,
 261                    base::Unretained(this),
 262                    local_state_registrar_.prefs()));
 263   }
 264   // TODO(pneubeck): change this to if/else once kProxy is only used as a user
 265   // pref. Currently, it is both a user and a local state pref.
 266   if (Profile::FromWebUI(web_ui())->GetPrefs()->FindPreference(
 267           pref_name.c_str())) {
 268     registrar_.Add(
 269         pref_name.c_str(),
 270         base::Bind(&CoreOptionsHandler::OnPreferenceChanged,
 271                    base::Unretained(this),
 272                    registrar_.prefs()));
 273   }
 274 }
 275
 276 void CoreOptionsHandler::StopObservingPref(const std::string& pref_name) {
 277   if (g_browser_process->local_state()->FindPreference(pref_name.c_str()))
 278     local_state_registrar_.Remove(pref_name.c_str());
 279   else
 280     registrar_.Remove(pref_name.c_str());
 281 }
 282
 283 void CoreOptionsHandler::SetPref(const std::string& pref_name,
 284                                  const base::Value* value,
 285                                  const std::string& metric) {
 286   PrefService* pref_service = FindServiceForPref(pref_name);
 287   PrefChangeFilterMap::iterator iter = pref_change_filters_.find(pref_name);
 288   if (iter != pref_change_filters_.end()) {
 289     // Also check if the pref is user modifiable (don't even try to run the
 290     // filter function if the user is not allowed to change the pref).
 291     const PrefService::Preference* pref =
 292         pref_service->FindPreference(pref_name.c_str());
 293     if ((pref && !pref->IsUserModifiable()) || !iter->second.Run(value)) {
 294       // Reject the change; remind the page of the true value.
 295       NotifyPrefChanged(pref_name, std::string());
 296       return;
 297     }
 298   }
 299
 300   switch (value->GetType()) {
 301     case base::Value::TYPE_BOOLEAN:
 302     case base::Value::TYPE_INTEGER:
 303     case base::Value::TYPE_DOUBLE:
 304     case base::Value::TYPE_STRING:
 305     case base::Value::TYPE_LIST:
 306       pref_service->Set(pref_name.c_str(), *value);
 307       break;
 308
 309     default:
 310       NOTREACHED();
 311       return;
 312   }
 313
 314   ProcessUserMetric(value, metric);
 315 }
 316
 317 void CoreOptionsHandler::ClearPref(const std::string& pref_name,
 318                                    const std::string& metric) {
 319   PrefService* pref_service = FindServiceForPref(pref_name);
 320   pref_service->ClearPref(pref_name.c_str());
 321
 322   if (!metric.empty())
 323     content::RecordComputedAction(metric);
 324 }
 325
 326 void CoreOptionsHandler::ProcessUserMetric(const base::Value* value,
 327                                            const std::string& metric) {
 328   if (metric.empty())
 329     return;
 330
 331   std::string metric_string = metric;
 332   if (value->IsType(base::Value::TYPE_BOOLEAN)) {
 333     bool bool_value;
 334     CHECK(value->GetAsBoolean(&bool_value));
 335     metric_string += bool_value ? "_Enable" : "_Disable";
 336   }
 337
 338   content::RecordComputedAction(metric_string);
 339 }
 340
 341 void CoreOptionsHandler::NotifyPrefChanged(
 342     const std::string& pref_name,
 343     const std::string& controlling_pref_name) {
 344   scoped_ptr<base::Value> value(
 345       CreateValueForPref(pref_name, controlling_pref_name));
 346   DispatchPrefChangeNotification(pref_name, value.Pass());
 347 }
 348
 349 void CoreOptionsHandler::DispatchPrefChangeNotification(
 350     const std::string& name,
 351     scoped_ptr<base::Value> value) {
 352   std::pair<PreferenceCallbackMap::const_iterator,
 353             PreferenceCallbackMap::const_iterator> range =
 354       pref_callback_map_.equal_range(name);
 355   base::ListValue result_value;
 356   result_value.Append(new base::StringValue(name.c_str()));
 357   result_value.Append(value.release());
 358   for (PreferenceCallbackMap::const_iterator iter = range.first;
 359        iter != range.second; ++iter) {
 360     const std::string& callback_function = iter->second;
 361     web_ui()->CallJavascriptFunction(callback_function, result_value);
 362   }
 363 }
 364
 365 base::Value* CoreOptionsHandler::CreateValueForPref(
 366     const std::string& pref_name,
 367     const std::string& controlling_pref_name) {
 368   const PrefService* pref_service = FindServiceForPref(pref_name.c_str());
 369   const PrefService::Preference* pref =
 370       pref_service->FindPreference(pref_name.c_str());
 371   if (!pref) {
 372     NOTREACHED();
 373     return base::Value::CreateNullValue();
 374   }
 375   const PrefService::Preference* controlling_pref =
 376       pref_service->FindPreference(controlling_pref_name.c_str());
 377   if (!controlling_pref)
 378     controlling_pref = pref;
 379
 380   base::DictionaryValue* dict = new base::DictionaryValue;
 381   dict->Set("value", pref->GetValue()->DeepCopy());
 382   if (controlling_pref->IsManaged()) {
 383     dict->SetString("controlledBy", "policy");
 384   } else if (controlling_pref->IsExtensionControlled() &&
 385              CanSetExtensionControlledPrefValue(controlling_pref)) {
 386     Profile* profile = Profile::FromWebUI(web_ui());
 387     ExtensionPrefValueMap* extension_pref_value_map =
 388         ExtensionPrefValueMapFactory::GetForBrowserContext(profile);
 389     std::string extension_id =
 390         extension_pref_value_map->GetExtensionControllingPref(
 391             controlling_pref->name());
 392
 393     const extensions::Extension* extension =
 394         extensions::ExtensionRegistry::Get(profile)->GetExtensionById(
 395             extension_id, extensions::ExtensionRegistry::EVERYTHING);
 396     if (extension) {
 397       dict->SetString("controlledBy", "extension");
 398       dict->Set("extension",
 399                 extensions::util::GetExtensionInfo(extension).release());
 400     }
 401   } else if (controlling_pref->IsRecommended()) {
 402     dict->SetString("controlledBy", "recommended");
 403   }
 404
 405   const base::Value* recommended_value =
 406       controlling_pref->GetRecommendedValue();
 407   if (recommended_value)
 408     dict->Set("recommendedValue", recommended_value->DeepCopy());
 409   dict->SetBoolean("disabled", !controlling_pref->IsUserModifiable());
 410   return dict;
 411 }
 412
 413 PrefService* CoreOptionsHandler::FindServiceForPref(
 414     const std::string& pref_name) {
 415   // Proxy is a peculiar case: on ChromeOS, settings exist in both user
 416   // prefs and local state, but chrome://settings should affect only user prefs.
 417   // Elsewhere the proxy settings are stored in local state.
 418   // See http://crbug.com/157147
 419   PrefService* user_prefs = Profile::FromWebUI(web_ui())->GetPrefs();
 420   if (pref_name == prefs::kProxy)
 421 #if defined(OS_CHROMEOS)
 422     return user_prefs;
 423 #else
 424     return g_browser_process->local_state();
 425 #endif
 426
 427   // Find which PrefService contains the given pref. Pref names should not
 428   // be duplicated across services, however if they are, prefer the user's
 429   // prefs.
 430   if (user_prefs->FindPreference(pref_name.c_str()))
 431     return user_prefs;
 432
 433   if (g_browser_process->local_state()->FindPreference(pref_name.c_str()))
 434     return g_browser_process->local_state();
 435
 436   return user_prefs;
 437 }
 438
 439 void CoreOptionsHandler::HandleFetchPrefs(const base::ListValue* args) {
 440   // First param is name of callback function, so, there needs to be at least
 441   // one more element for the actual preference identifier.
 442   DCHECK_GE(static_cast<int>(args->GetSize()), 2);
 443
 444   // Get callback JS function name.
 445   const base::Value* callback;
 446   if (!args->Get(0, &callback) || !callback->IsType(base::Value::TYPE_STRING))
 447     return;
 448
 449   base::string16 callback_function;
 450   if (!callback->GetAsString(&callback_function))
 451     return;
 452
 453   // Get the list of name for prefs to build the response dictionary.
 454   base::DictionaryValue result_value;
 455   const base::Value* list_member;
 456
 457   for (size_t i = 1; i < args->GetSize(); i++) {
 458     if (!args->Get(i, &list_member))
 459       break;
 460
 461     if (!list_member->IsType(base::Value::TYPE_STRING))
 462       continue;
 463
 464     std::string pref_name;
 465     if (!list_member->GetAsString(&pref_name))
 466       continue;
 467
 468     result_value.Set(pref_name.c_str(), FetchPref(pref_name));
 469   }
 470   web_ui()->CallJavascriptFunction(base::UTF16ToASCII(callback_function),
 471                                    result_value);
 472 }
 473
 474 void CoreOptionsHandler::HandleObservePrefs(const base::ListValue* args) {
 475   // First param is name is JS callback function name, the rest are pref
 476   // identifiers that we are observing.
 477   DCHECK_GE(static_cast<int>(args->GetSize()), 2);
 478
 479   // Get preference change callback function name.
 480   std::string callback_func_name;
 481   if (!args->GetString(0, &callback_func_name))
 482     return;
 483
 484   // Get all other parameters - pref identifiers.
 485   for (size_t i = 1; i < args->GetSize(); i++) {
 486     const base::Value* list_member;
 487     if (!args->Get(i, &list_member))
 488       break;
 489
 490     // Just ignore bad pref identifiers for now.
 491     std::string pref_name;
 492     if (!list_member->IsType(base::Value::TYPE_STRING) ||
 493         !list_member->GetAsString(&pref_name))
 494       continue;
 495
 496     if (pref_callback_map_.find(pref_name) == pref_callback_map_.end())
 497       ObservePref(pref_name);
 498
 499     pref_callback_map_.insert(
 500         PreferenceCallbackMap::value_type(pref_name, callback_func_name));
 501   }
 502 }
 503
 504 void CoreOptionsHandler::HandleSetBooleanPref(const base::ListValue* args) {
 505   HandleSetPref(args, TYPE_BOOLEAN);
 506 }
 507
 508 void CoreOptionsHandler::HandleSetIntegerPref(const base::ListValue* args) {
 509   HandleSetPref(args, TYPE_INTEGER);
 510 }
 511
 512 void CoreOptionsHandler::HandleSetDoublePref(const base::ListValue* args) {
 513   HandleSetPref(args, TYPE_DOUBLE);
 514 }
 515
 516 void CoreOptionsHandler::HandleSetStringPref(const base::ListValue* args) {
 517   HandleSetPref(args, TYPE_STRING);
 518 }
 519
 520 void CoreOptionsHandler::HandleSetURLPref(const base::ListValue* args) {
 521   HandleSetPref(args, TYPE_URL);
 522 }
 523
 524 void CoreOptionsHandler::HandleSetListPref(const base::ListValue* args) {
 525   HandleSetPref(args, TYPE_LIST);
 526 }
 527
 528 void CoreOptionsHandler::HandleSetPref(const base::ListValue* args,
 529                                        PrefType type) {
 530   DCHECK_GT(static_cast<int>(args->GetSize()), 1);
 531
 532   std::string pref_name;
 533   if (!args->GetString(0, &pref_name))
 534     return;
 535
 536   const base::Value* value;
 537   if (!args->Get(1, &value))
 538     return;
 539
 540   scoped_ptr<base::Value> temp_value;
 541
 542   switch (type) {
 543     case TYPE_BOOLEAN:
 544       if (!value->IsType(base::Value::TYPE_BOOLEAN)) {
 545         NOTREACHED();
 546         return;
 547       }
 548       break;
 549     case TYPE_INTEGER: {
 550       // In JS all numbers are doubles.
 551       double double_value;
 552       if (!value->GetAsDouble(&double_value)) {
 553         NOTREACHED();
 554         return;
 555       }
 556       int int_value = static_cast<int>(double_value);
 557       temp_value.reset(new base::FundamentalValue(int_value));
 558       value = temp_value.get();
 559       break;
 560     }
 561     case TYPE_DOUBLE:
 562       if (!value->IsType(base::Value::TYPE_DOUBLE)) {
 563         NOTREACHED();
 564         return;
 565       }
 566       break;
 567     case TYPE_STRING:
 568       if (!value->IsType(base::Value::TYPE_STRING)) {
 569         NOTREACHED();
 570         return;
 571       }
 572       break;
 573     case TYPE_URL: {
 574       std::string original;
 575       if (!value->GetAsString(&original)) {
 576         NOTREACHED();
 577         return;
 578       }
 579       GURL fixed = url_fixer::FixupURL(original, std::string());
 580       temp_value.reset(new base::StringValue(fixed.spec()));
 581       value = temp_value.get();
 582       break;
 583     }
 584     case TYPE_LIST: {
 585       // In case we have a List pref we got a JSON string.
 586       std::string json_string;
 587       if (!value->GetAsString(&json_string)) {
 588         NOTREACHED();
 589         return;
 590       }
 591       temp_value.reset(
 592           base::JSONReader::Read(json_string));
 593       value = temp_value.get();
 594       if (!value->IsType(base::Value::TYPE_LIST)) {
 595         NOTREACHED();
 596         return;
 597       }
 598       break;
 599     }
 600     default:
 601       NOTREACHED();
 602   }
 603
 604   std::string metric;
 605   if (args->GetSize() > 2 && !args->GetString(2, &metric))
 606     LOG(WARNING) << "Invalid metric parameter: " << pref_name;
 607   SetPref(pref_name, value, metric);
 608 }
 609
 610 void CoreOptionsHandler::HandleClearPref(const base::ListValue* args) {
 611   DCHECK_GT(static_cast<int>(args->GetSize()), 0);
 612
 613   std::string pref_name;
 614   if (!args->GetString(0, &pref_name))
 615     return;
 616
 617   std::string metric;
 618   if (args->GetSize() > 1) {
 619     if (!args->GetString(1, &metric))
 620       NOTREACHED();
 621   }
 622
 623   ClearPref(pref_name, metric);
 624 }
 625
 626 void CoreOptionsHandler::HandleUserMetricsAction(const base::ListValue* args) {
 627   std::string metric = base::UTF16ToUTF8(ExtractStringValue(args));
 628   if (!metric.empty())
 629     content::RecordComputedAction(metric);
 630 }
 631
 632 void CoreOptionsHandler::HandleDisableExtension(const base::ListValue* args) {
 633   std::string extension_id;
 634   if (args->GetString(0, &extension_id)) {
 635     ExtensionService* extension_service = extensions::ExtensionSystem::Get(
 636         Profile::FromWebUI(web_ui()))->extension_service();
 637     DCHECK(extension_service);
 638     extension_service->DisableExtension(
 639         extension_id, extensions::Extension::DISABLE_USER_ACTION);
 640   } else {
 641     NOTREACHED();
 642   }
 643 }
 644
 645 void CoreOptionsHandler::UpdateClearPluginLSOData() {
 646   base::FundamentalValue enabled(
 647           plugin_status_pref_setter_.IsClearPluginLSODataEnabled());
 648   web_ui()->CallJavascriptFunction(
 649       "OptionsPage.setClearPluginLSODataEnabled", enabled);
 650 }
 651
 652 void CoreOptionsHandler::UpdatePepperFlashSettingsEnabled() {
 653   base::FundamentalValue enabled(
 654           plugin_status_pref_setter_.IsPepperFlashSettingsEnabled());
 655   web_ui()->CallJavascriptFunction(
 656       "OptionsPage.setPepperFlashSettingsEnabled", enabled);
 657 }
 658
 659 bool CoreOptionsHandler::IsUserUnsupervised(const base::Value* to_value) {
 660   return !Profile::FromWebUI(web_ui())->IsSupervised();
 661 }
 662
 663 }  // namespace options