chrome/browser/extensions/api/preference/preference_api.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/extensions/api/preference/preference_api.h"
   6
   7 #include <map>
   8 #include <utility>
   9
  10 #include "base/lazy_instance.h"
  11 #include "base/memory/singleton.h"
  12 #include "base/prefs/pref_service.h"
  13 #include "base/stl_util.h"
  14 #include "base/strings/stringprintf.h"
  15 #include "base/values.h"
  16 #include "chrome/browser/chrome_notification_types.h"
  17 #include "chrome/browser/extensions/api/content_settings/content_settings_service.h"
  18 #include "chrome/browser/extensions/api/preference/preference_api_constants.h"
  19 #include "chrome/browser/extensions/api/preference/preference_helpers.h"
  20 #include "chrome/browser/extensions/api/proxy/proxy_api.h"
  21 #include "chrome/browser/extensions/extension_service.h"
  22 #include "chrome/browser/net/prediction_options.h"
  23 #include "chrome/browser/profiles/profile.h"
  24 #include "chrome/common/pref_names.h"
  25 #include "components/content_settings/core/common/pref_names.h"
  26 #include "components/proxy_config/proxy_config_pref_names.h"
  27 #include "components/translate/core/common/translate_pref_names.h"
  28 #include "content/public/browser/notification_details.h"
  29 #include "content/public/browser/notification_source.h"
  30 #include "extensions/browser/extension_pref_value_map.h"
  31 #include "extensions/browser/extension_pref_value_map_factory.h"
  32 #include "extensions/browser/extension_prefs.h"
  33 #include "extensions/browser/extension_prefs_factory.h"
  34 #include "extensions/browser/extension_system_provider.h"
  35 #include "extensions/browser/extensions_browser_client.h"
  36 #include "extensions/browser/pref_names.h"
  37 #include "extensions/common/error_utils.h"
  38 #include "extensions/common/permissions/api_permission.h"
  39 #include "extensions/common/permissions/permissions_data.h"
  40
  41 namespace keys = extensions::preference_api_constants;
  42 namespace helpers = extensions::preference_helpers;
  43
  44 using base::DictionaryValue;
  45
  46 namespace extensions {
  47
  48 namespace {
  49
  50 struct PrefMappingEntry {
  51   // Name of the preference referenced by the extension API JSON.
  52   const char* extension_pref;
  53
  54   // Name of the preference in the PrefStores.
  55   const char* browser_pref;
  56
  57   // Permission required to read and observe this preference.
  58   // Use APIPermission::kInvalid for |read_permission| to express that the read
  59   // permission should not be granted.
  60   APIPermission::ID read_permission;
  61
  62   // Permission required to write this preference.
  63   // Use APIPermission::kInvalid for |write_permission| to express that the
  64   // write permission should not be granted.
  65   APIPermission::ID write_permission;
  66 };
  67
  68 const char kOnPrefChangeFormat[] = "types.ChromeSetting.%s.onChange";
  69 const char kConversionErrorMessage[] =
  70     "Internal error: Stored value for preference '*' cannot be converted "
  71     "properly.";
  72
  73 PrefMappingEntry kPrefMapping[] = {
  74     {"spdy_proxy.enabled",
  75      data_reduction_proxy::prefs::kDataReductionProxyEnabled,
  76      APIPermission::kDataReductionProxy, APIPermission::kDataReductionProxy},
  77     {"data_reduction.daily_original_length",
  78      data_reduction_proxy::prefs::kDailyHttpOriginalContentLength,
  79      APIPermission::kDataReductionProxy, APIPermission::kDataReductionProxy},
  80     {"data_reduction.daily_received_length",
  81      data_reduction_proxy::prefs::kDailyHttpReceivedContentLength,
  82      APIPermission::kDataReductionProxy, APIPermission::kDataReductionProxy},
  83     {"alternateErrorPagesEnabled", prefs::kAlternateErrorPagesEnabled,
  84      APIPermission::kPrivacy, APIPermission::kPrivacy},
  85     {"autofillEnabled", autofill::prefs::kAutofillEnabled,
  86      APIPermission::kPrivacy, APIPermission::kPrivacy},
  87     {"hyperlinkAuditingEnabled", prefs::kEnableHyperlinkAuditing,
  88      APIPermission::kPrivacy, APIPermission::kPrivacy},
  89     {"hotwordSearchEnabled", prefs::kHotwordSearchEnabled,
  90      APIPermission::kPrivacy, APIPermission::kPrivacy},
  91     {"networkPredictionEnabled", prefs::kNetworkPredictionOptions,
  92      APIPermission::kPrivacy, APIPermission::kPrivacy},
  93     {"passwordSavingEnabled",
  94      password_manager::prefs::kPasswordManagerSavingEnabled,
  95      APIPermission::kPrivacy, APIPermission::kPrivacy},
  96     {"protectedContentEnabled", prefs::kEnableDRM, APIPermission::kPrivacy,
  97      APIPermission::kPrivacy},
  98     {"proxy", proxy_config::prefs::kProxy, APIPermission::kProxy,
  99      APIPermission::kProxy},
 100     {"referrersEnabled", prefs::kEnableReferrers, APIPermission::kPrivacy,
 101      APIPermission::kPrivacy},
 102     {"safeBrowsingEnabled", prefs::kSafeBrowsingEnabled,
 103      APIPermission::kPrivacy, APIPermission::kPrivacy},
 104     {"safeBrowsingExtendedReportingEnabled",
 105      prefs::kSafeBrowsingExtendedReportingEnabled, APIPermission::kPrivacy,
 106      APIPermission::kPrivacy},
 107     {"searchSuggestEnabled", prefs::kSearchSuggestEnabled,
 108      APIPermission::kPrivacy, APIPermission::kPrivacy},
 109     {"spellingServiceEnabled", prefs::kSpellCheckUseSpellingService,
 110      APIPermission::kPrivacy, APIPermission::kPrivacy},
 111     {"thirdPartyCookiesAllowed", prefs::kBlockThirdPartyCookies,
 112      APIPermission::kPrivacy, APIPermission::kPrivacy},
 113     {"translationServiceEnabled", prefs::kEnableTranslate,
 114      APIPermission::kPrivacy, APIPermission::kPrivacy},
 115 #if defined(ENABLE_WEBRTC)
 116     {"webRTCMultipleRoutesEnabled", prefs::kWebRTCMultipleRoutesEnabled,
 117      APIPermission::kPrivacy, APIPermission::kPrivacy},
 118     {"webRTCNonProxiedUdpEnabled", prefs::kWebRTCNonProxiedUdpEnabled,
 119      APIPermission::kPrivacy, APIPermission::kPrivacy},
 120 #endif
 121     // accessibilityFeatures.animationPolicy is available for
 122     // all platforms but the others from accessibilityFeatures
 123     // is only available for OS_CHROMEOS.
 124     {"animationPolicy", prefs::kAnimationPolicy,
 125      APIPermission::kAccessibilityFeaturesRead,
 126      APIPermission::kAccessibilityFeaturesModify},
 127 #if defined(OS_CHROMEOS)
 128     {"autoclick", prefs::kAccessibilityAutoclickEnabled,
 129      APIPermission::kAccessibilityFeaturesRead,
 130      APIPermission::kAccessibilityFeaturesModify},
 131     {"highContrast", prefs::kAccessibilityHighContrastEnabled,
 132      APIPermission::kAccessibilityFeaturesRead,
 133      APIPermission::kAccessibilityFeaturesModify},
 134     {"largeCursor", prefs::kAccessibilityLargeCursorEnabled,
 135      APIPermission::kAccessibilityFeaturesRead,
 136      APIPermission::kAccessibilityFeaturesModify},
 137     {"screenMagnifier", prefs::kAccessibilityScreenMagnifierEnabled,
 138      APIPermission::kAccessibilityFeaturesRead,
 139      APIPermission::kAccessibilityFeaturesModify},
 140     {"spokenFeedback", prefs::kAccessibilitySpokenFeedbackEnabled,
 141      APIPermission::kAccessibilityFeaturesRead,
 142      APIPermission::kAccessibilityFeaturesModify},
 143     {"stickyKeys", prefs::kAccessibilityStickyKeysEnabled,
 144      APIPermission::kAccessibilityFeaturesRead,
 145      APIPermission::kAccessibilityFeaturesModify},
 146     {"virtualKeyboard", prefs::kAccessibilityVirtualKeyboardEnabled,
 147      APIPermission::kAccessibilityFeaturesRead,
 148      APIPermission::kAccessibilityFeaturesModify},
 149 #endif
 150 };
 151
 152 class IdentityPrefTransformer : public PrefTransformerInterface {
 153  public:
 154   base::Value* ExtensionToBrowserPref(const base::Value* extension_pref,
 155                                       std::string* error,
 156                                       bool* bad_message) override {
 157     return extension_pref->DeepCopy();
 158   }
 159
 160   base::Value* BrowserToExtensionPref(
 161       const base::Value* browser_pref) override {
 162     return browser_pref->DeepCopy();
 163   }
 164 };
 165
 166 class InvertBooleanTransformer : public PrefTransformerInterface {
 167  public:
 168   base::Value* ExtensionToBrowserPref(const base::Value* extension_pref,
 169                                       std::string* error,
 170                                       bool* bad_message) override {
 171     return InvertBooleanValue(extension_pref);
 172   }
 173
 174   base::Value* BrowserToExtensionPref(
 175       const base::Value* browser_pref) override {
 176     return InvertBooleanValue(browser_pref);
 177   }
 178
 179  private:
 180   static base::Value* InvertBooleanValue(const base::Value* value) {
 181     bool bool_value = false;
 182     bool result = value->GetAsBoolean(&bool_value);
 183     DCHECK(result);
 184     return new base::FundamentalValue(!bool_value);
 185   }
 186 };
 187
 188 class NetworkPredictionTransformer : public PrefTransformerInterface {
 189  public:
 190   base::Value* ExtensionToBrowserPref(const base::Value* extension_pref,
 191                                       std::string* error,
 192                                       bool* bad_message) override {
 193     bool bool_value = false;
 194     const bool pref_found = extension_pref->GetAsBoolean(&bool_value);
 195     DCHECK(pref_found) << "Preference not found.";
 196     if (bool_value) {
 197       return new base::FundamentalValue(
 198           chrome_browser_net::NETWORK_PREDICTION_DEFAULT);
 199     } else {
 200       return new base::FundamentalValue(
 201           chrome_browser_net::NETWORK_PREDICTION_NEVER);
 202     }
 203   }
 204
 205   base::Value* BrowserToExtensionPref(
 206       const base::Value* browser_pref) override {
 207     int int_value = chrome_browser_net::NETWORK_PREDICTION_DEFAULT;
 208     const bool pref_found = browser_pref->GetAsInteger(&int_value);
 209     DCHECK(pref_found) << "Preference not found.";
 210     return new base::FundamentalValue(
 211         int_value != chrome_browser_net::NETWORK_PREDICTION_NEVER);
 212   }
 213 };
 214
 215 class PrefMapping {
 216  public:
 217   static PrefMapping* GetInstance() {
 218     return Singleton<PrefMapping>::get();
 219   }
 220
 221   bool FindBrowserPrefForExtensionPref(const std::string& extension_pref,
 222                                        std::string* browser_pref,
 223                                        APIPermission::ID* read_permission,
 224                                        APIPermission::ID* write_permission) {
 225     PrefMap::iterator it = mapping_.find(extension_pref);
 226     if (it != mapping_.end()) {
 227       *browser_pref = it->second.pref_name;
 228       *read_permission = it->second.read_permission;
 229       *write_permission = it->second.write_permission;
 230       return true;
 231     }
 232     return false;
 233   }
 234
 235   bool FindEventForBrowserPref(const std::string& browser_pref,
 236                                std::string* event_name,
 237                                APIPermission::ID* permission) {
 238     PrefMap::iterator it = event_mapping_.find(browser_pref);
 239     if (it != event_mapping_.end()) {
 240       *event_name = it->second.pref_name;
 241       *permission = it->second.read_permission;
 242       return true;
 243     }
 244     return false;
 245   }
 246
 247   PrefTransformerInterface* FindTransformerForBrowserPref(
 248       const std::string& browser_pref) {
 249     std::map<std::string, PrefTransformerInterface*>::iterator it =
 250         transformers_.find(browser_pref);
 251     if (it != transformers_.end())
 252       return it->second;
 253     else
 254       return identity_transformer_.get();
 255   }
 256
 257  private:
 258   friend struct DefaultSingletonTraits<PrefMapping>;
 259
 260   PrefMapping() {
 261     identity_transformer_.reset(new IdentityPrefTransformer());
 262     for (size_t i = 0; i < arraysize(kPrefMapping); ++i) {
 263       mapping_[kPrefMapping[i].extension_pref] =
 264           PrefMapData(kPrefMapping[i].browser_pref,
 265                       kPrefMapping[i].read_permission,
 266                       kPrefMapping[i].write_permission);
 267       std::string event_name =
 268           base::StringPrintf(kOnPrefChangeFormat,
 269                              kPrefMapping[i].extension_pref);
 270       event_mapping_[kPrefMapping[i].browser_pref] =
 271           PrefMapData(event_name,
 272                       kPrefMapping[i].read_permission,
 273                       kPrefMapping[i].write_permission);
 274     }
 275     DCHECK_EQ(arraysize(kPrefMapping), mapping_.size());
 276     DCHECK_EQ(arraysize(kPrefMapping), event_mapping_.size());
 277     RegisterPrefTransformer(proxy_config::prefs::kProxy,
 278                             new ProxyPrefTransformer());
 279     RegisterPrefTransformer(prefs::kBlockThirdPartyCookies,
 280                             new InvertBooleanTransformer());
 281     RegisterPrefTransformer(prefs::kNetworkPredictionOptions,
 282                             new NetworkPredictionTransformer());
 283   }
 284
 285   ~PrefMapping() {
 286     STLDeleteContainerPairSecondPointers(transformers_.begin(),
 287                                          transformers_.end());
 288   }
 289
 290   void RegisterPrefTransformer(const std::string& browser_pref,
 291                                PrefTransformerInterface* transformer) {
 292     DCHECK_EQ(0u, transformers_.count(browser_pref)) <<
 293         "Trying to register pref transformer for " << browser_pref << " twice";
 294     transformers_[browser_pref] = transformer;
 295   }
 296
 297   struct PrefMapData {
 298     PrefMapData()
 299         : read_permission(APIPermission::kInvalid),
 300           write_permission(APIPermission::kInvalid) {}
 301
 302     PrefMapData(const std::string& pref_name,
 303                 APIPermission::ID read,
 304                 APIPermission::ID write)
 305         : pref_name(pref_name),
 306           read_permission(read),
 307           write_permission(write) {}
 308
 309     // Browser or extension preference to which the data maps.
 310     std::string pref_name;
 311
 312     // Permission needed to read the preference.
 313     APIPermission::ID read_permission;
 314
 315     // Permission needed to write the preference.
 316     APIPermission::ID write_permission;
 317   };
 318
 319   typedef std::map<std::string, PrefMapData> PrefMap;
 320
 321   // Mapping from extension pref keys to browser pref keys and permissions.
 322   PrefMap mapping_;
 323
 324   // Mapping from browser pref keys to extension event names and permissions.
 325   PrefMap event_mapping_;
 326
 327   // Mapping from browser pref keys to transformers.
 328   std::map<std::string, PrefTransformerInterface*> transformers_;
 329
 330   scoped_ptr<PrefTransformerInterface> identity_transformer_;
 331
 332   DISALLOW_COPY_AND_ASSIGN(PrefMapping);
 333 };
 334
 335 }  // namespace
 336
 337 PreferenceEventRouter::PreferenceEventRouter(Profile* profile)
 338     : profile_(profile) {
 339   registrar_.Init(profile_->GetPrefs());
 340   incognito_registrar_.Init(profile_->GetOffTheRecordPrefs());
 341   for (size_t i = 0; i < arraysize(kPrefMapping); ++i) {
 342     registrar_.Add(kPrefMapping[i].browser_pref,
 343                    base::Bind(&PreferenceEventRouter::OnPrefChanged,
 344                               base::Unretained(this),
 345                               registrar_.prefs()));
 346     incognito_registrar_.Add(kPrefMapping[i].browser_pref,
 347                              base::Bind(&PreferenceEventRouter::OnPrefChanged,
 348                                         base::Unretained(this),
 349                                         incognito_registrar_.prefs()));
 350   }
 351 }
 352
 353 PreferenceEventRouter::~PreferenceEventRouter() { }
 354
 355 void PreferenceEventRouter::OnPrefChanged(PrefService* pref_service,
 356                                           const std::string& browser_pref) {
 357   bool incognito = (pref_service != profile_->GetPrefs());
 358
 359   std::string event_name;
 360   APIPermission::ID permission = APIPermission::kInvalid;
 361   bool rv = PrefMapping::GetInstance()->FindEventForBrowserPref(
 362       browser_pref, &event_name, &permission);
 363   DCHECK(rv);
 364
 365   base::ListValue args;
 366   base::DictionaryValue* dict = new base::DictionaryValue();
 367   args.Append(dict);
 368   const PrefService::Preference* pref =
 369       pref_service->FindPreference(browser_pref.c_str());
 370   CHECK(pref);
 371   PrefTransformerInterface* transformer =
 372       PrefMapping::GetInstance()->FindTransformerForBrowserPref(browser_pref);
 373   base::Value* transformed_value =
 374       transformer->BrowserToExtensionPref(pref->GetValue());
 375   if (!transformed_value) {
 376     LOG(ERROR) << ErrorUtils::FormatErrorMessage(kConversionErrorMessage,
 377                                                  pref->name());
 378     return;
 379   }
 380
 381   dict->Set(keys::kValue, transformed_value);
 382   if (incognito) {
 383     ExtensionPrefs* ep = ExtensionPrefs::Get(profile_);
 384     dict->SetBoolean(keys::kIncognitoSpecific,
 385                      ep->HasIncognitoPrefValue(browser_pref));
 386   }
 387
 388   // TODO(kalman): Have a histogram value for each pref type.
 389   // This isn't so important for the current use case of these
 390   // histograms, which is to track which event types are waking up event
 391   // pages, or which are delivered to persistent background pages. Simply
 392   // "a setting changed" is enough detail for that. However if we try to
 393   // use these histograms for any fine-grained logic (like removing the
 394   // string event name altogether), or if we discover this event is
 395   // firing a lot and want to understand that better, then this will need
 396   // to change.
 397   events::HistogramValue histogram_value =
 398       events::TYPES_CHROME_SETTING_ON_CHANGE;
 399   helpers::DispatchEventToExtensions(profile_, histogram_value, event_name,
 400                                      &args, permission, incognito,
 401                                      browser_pref);
 402 }
 403
 404 void PreferenceAPIBase::SetExtensionControlledPref(
 405     const std::string& extension_id,
 406     const std::string& pref_key,
 407     ExtensionPrefsScope scope,
 408     base::Value* value) {
 409 #ifndef NDEBUG
 410   const PrefService::Preference* pref =
 411       extension_prefs()->pref_service()->FindPreference(pref_key.c_str());
 412   DCHECK(pref) << "Extension controlled preference key " << pref_key
 413                << " not registered.";
 414   DCHECK_EQ(pref->GetType(), value->GetType())
 415       << "Extension controlled preference " << pref_key << " has wrong type.";
 416 #endif
 417
 418   std::string scope_string;
 419   // ScopeToPrefName() returns false if the scope is not persisted.
 420   if (pref_names::ScopeToPrefName(scope, &scope_string)) {
 421     // Also store in persisted Preferences file to recover after a
 422     // browser restart.
 423     ExtensionPrefs::ScopedDictionaryUpdate update(extension_prefs(),
 424                                                   extension_id,
 425                                                   scope_string);
 426     base::DictionaryValue* preference = update.Get();
 427     if (!preference)
 428       preference = update.Create();
 429     preference->SetWithoutPathExpansion(pref_key, value->DeepCopy());
 430   }
 431   extension_pref_value_map()->SetExtensionPref(
 432       extension_id, pref_key, scope, value);
 433 }
 434
 435 void PreferenceAPIBase::RemoveExtensionControlledPref(
 436     const std::string& extension_id,
 437     const std::string& pref_key,
 438     ExtensionPrefsScope scope) {
 439   DCHECK(extension_prefs()->pref_service()->FindPreference(pref_key.c_str()))
 440       << "Extension controlled preference key " << pref_key
 441       << " not registered.";
 442
 443   std::string scope_string;
 444   if (pref_names::ScopeToPrefName(scope, &scope_string)) {
 445     ExtensionPrefs::ScopedDictionaryUpdate update(extension_prefs(),
 446                                                   extension_id,
 447                                                   scope_string);
 448     base::DictionaryValue* preference = update.Get();
 449     if (preference)
 450       preference->RemoveWithoutPathExpansion(pref_key, NULL);
 451   }
 452   extension_pref_value_map()->RemoveExtensionPref(
 453       extension_id, pref_key, scope);
 454 }
 455
 456 bool PreferenceAPIBase::CanExtensionControlPref(
 457      const std::string& extension_id,
 458      const std::string& pref_key,
 459      bool incognito) {
 460   DCHECK(extension_prefs()->pref_service()->FindPreference(pref_key.c_str()))
 461       << "Extension controlled preference key " << pref_key
 462       << " not registered.";
 463
 464   return extension_pref_value_map()->CanExtensionControlPref(
 465        extension_id, pref_key, incognito);
 466 }
 467
 468 bool PreferenceAPIBase::DoesExtensionControlPref(
 469     const std::string& extension_id,
 470     const std::string& pref_key,
 471     bool* from_incognito) {
 472   DCHECK(extension_prefs()->pref_service()->FindPreference(pref_key.c_str()))
 473       << "Extension controlled preference key " << pref_key
 474       << " not registered.";
 475
 476   return extension_pref_value_map()->DoesExtensionControlPref(
 477       extension_id, pref_key, from_incognito);
 478 }
 479
 480 PreferenceAPI::PreferenceAPI(content::BrowserContext* context)
 481     : profile_(Profile::FromBrowserContext(context)) {
 482   for (size_t i = 0; i < arraysize(kPrefMapping); ++i) {
 483     std::string event_name;
 484     APIPermission::ID permission = APIPermission::kInvalid;
 485     bool rv = PrefMapping::GetInstance()->FindEventForBrowserPref(
 486         kPrefMapping[i].browser_pref, &event_name, &permission);
 487     DCHECK(rv);
 488     EventRouter::Get(profile_)->RegisterObserver(this, event_name);
 489   }
 490   content_settings_store()->AddObserver(this);
 491 }
 492
 493 PreferenceAPI::~PreferenceAPI() {
 494 }
 495
 496 void PreferenceAPI::Shutdown() {
 497   EventRouter::Get(profile_)->UnregisterObserver(this);
 498   if (!extension_prefs()->extensions_disabled())
 499     ClearIncognitoSessionOnlyContentSettings();
 500   content_settings_store()->RemoveObserver(this);
 501 }
 502
 503 static base::LazyInstance<BrowserContextKeyedAPIFactory<PreferenceAPI> >
 504     g_factory = LAZY_INSTANCE_INITIALIZER;
 505
 506 // static
 507 BrowserContextKeyedAPIFactory<PreferenceAPI>*
 508 PreferenceAPI::GetFactoryInstance() {
 509   return g_factory.Pointer();
 510 }
 511
 512 // static
 513 PreferenceAPI* PreferenceAPI::Get(content::BrowserContext* context) {
 514   return BrowserContextKeyedAPIFactory<PreferenceAPI>::Get(context);
 515 }
 516
 517 void PreferenceAPI::OnListenerAdded(const EventListenerInfo& details) {
 518   preference_event_router_.reset(new PreferenceEventRouter(profile_));
 519   EventRouter::Get(profile_)->UnregisterObserver(this);
 520 }
 521
 522 void PreferenceAPI::OnContentSettingChanged(const std::string& extension_id,
 523                                             bool incognito) {
 524   if (incognito) {
 525     extension_prefs()->UpdateExtensionPref(
 526         extension_id,
 527         pref_names::kPrefIncognitoContentSettings,
 528         content_settings_store()->GetSettingsForExtension(
 529             extension_id, kExtensionPrefsScopeIncognitoPersistent));
 530   } else {
 531     extension_prefs()->UpdateExtensionPref(
 532         extension_id,
 533         pref_names::kPrefContentSettings,
 534         content_settings_store()->GetSettingsForExtension(
 535             extension_id, kExtensionPrefsScopeRegular));
 536   }
 537 }
 538
 539 void PreferenceAPI::ClearIncognitoSessionOnlyContentSettings() {
 540   ExtensionIdList extension_ids;
 541   extension_prefs()->GetExtensions(&extension_ids);
 542   for (ExtensionIdList::iterator extension_id = extension_ids.begin();
 543        extension_id != extension_ids.end(); ++extension_id) {
 544     content_settings_store()->ClearContentSettingsForExtension(
 545         *extension_id, kExtensionPrefsScopeIncognitoSessionOnly);
 546   }
 547 }
 548
 549 ExtensionPrefs* PreferenceAPI::extension_prefs() {
 550   return ExtensionPrefs::Get(profile_);
 551 }
 552
 553 ExtensionPrefValueMap* PreferenceAPI::extension_pref_value_map() {
 554   return ExtensionPrefValueMapFactory::GetForBrowserContext(profile_);
 555 }
 556
 557 scoped_refptr<ContentSettingsStore> PreferenceAPI::content_settings_store() {
 558   return ContentSettingsService::Get(profile_)->content_settings_store();
 559 }
 560
 561 template <>
 562 void
 563 BrowserContextKeyedAPIFactory<PreferenceAPI>::DeclareFactoryDependencies() {
 564   DependsOn(ContentSettingsService::GetFactoryInstance());
 565   DependsOn(ExtensionPrefsFactory::GetInstance());
 566   DependsOn(ExtensionPrefValueMapFactory::GetInstance());
 567   DependsOn(ExtensionsBrowserClient::Get()->GetExtensionSystemFactory());
 568 }
 569
 570 PreferenceFunction::~PreferenceFunction() { }
 571
 572 bool PreferenceFunction::ValidateBrowserPref(
 573     const std::string& extension_pref_key,
 574     PreferenceFunction::PermissionType permission_type,
 575     std::string* browser_pref_key) {
 576   APIPermission::ID read_permission = APIPermission::kInvalid;
 577   APIPermission::ID write_permission = APIPermission::kInvalid;
 578   EXTENSION_FUNCTION_VALIDATE(
 579       PrefMapping::GetInstance()->FindBrowserPrefForExtensionPref(
 580           extension_pref_key,
 581           browser_pref_key,
 582           &read_permission,
 583           &write_permission));
 584   APIPermission::ID permission = permission_type == PERMISSION_TYPE_READ
 585                                      ? read_permission
 586                                      : write_permission;
 587   if (!extension()->permissions_data()->HasAPIPermission(permission)) {
 588     error_ = ErrorUtils::FormatErrorMessage(
 589         keys::kPermissionErrorMessage, extension_pref_key);
 590     return false;
 591   }
 592   return true;
 593 }
 594
 595 GetPreferenceFunction::~GetPreferenceFunction() { }
 596
 597 bool GetPreferenceFunction::RunSync() {
 598   std::string pref_key;
 599   EXTENSION_FUNCTION_VALIDATE(args_->GetString(0, &pref_key));
 600   base::DictionaryValue* details = NULL;
 601   EXTENSION_FUNCTION_VALIDATE(args_->GetDictionary(1, &details));
 602
 603   bool incognito = false;
 604   if (details->HasKey(keys::kIncognitoKey))
 605     EXTENSION_FUNCTION_VALIDATE(details->GetBoolean(keys::kIncognitoKey,
 606                                                     &incognito));
 607
 608   // Check incognito access.
 609   if (incognito && !include_incognito()) {
 610     error_ = keys::kIncognitoErrorMessage;
 611     return false;
 612   }
 613
 614   // Obtain pref.
 615   std::string browser_pref;
 616   if (!ValidateBrowserPref(
 617           pref_key, PreferenceFunction::PERMISSION_TYPE_READ, &browser_pref)) {
 618     return false;
 619   }
 620   PrefService* prefs = incognito ? GetProfile()->GetOffTheRecordPrefs()
 621                                  : GetProfile()->GetPrefs();
 622   const PrefService::Preference* pref =
 623       prefs->FindPreference(browser_pref.c_str());
 624   CHECK(pref);
 625
 626   scoped_ptr<base::DictionaryValue> result(new base::DictionaryValue);
 627
 628   // Retrieve level of control.
 629   std::string level_of_control = helpers::GetLevelOfControl(
 630       GetProfile(), extension_id(), browser_pref, incognito);
 631   result->SetString(keys::kLevelOfControl, level_of_control);
 632
 633   // Retrieve pref value.
 634   PrefTransformerInterface* transformer =
 635       PrefMapping::GetInstance()->FindTransformerForBrowserPref(browser_pref);
 636   base::Value* transformed_value =
 637       transformer->BrowserToExtensionPref(pref->GetValue());
 638   if (!transformed_value) {
 639     LOG(ERROR) <<
 640         ErrorUtils::FormatErrorMessage(kConversionErrorMessage,
 641                                                 pref->name());
 642     return false;
 643   }
 644   result->Set(keys::kValue, transformed_value);
 645
 646   // Retrieve incognito status.
 647   if (incognito) {
 648     ExtensionPrefs* ep = ExtensionPrefs::Get(GetProfile());
 649     result->SetBoolean(keys::kIncognitoSpecific,
 650                        ep->HasIncognitoPrefValue(browser_pref));
 651   }
 652
 653   SetResult(result.release());
 654   return true;
 655 }
 656
 657 SetPreferenceFunction::~SetPreferenceFunction() { }
 658
 659 bool SetPreferenceFunction::RunSync() {
 660   std::string pref_key;
 661   EXTENSION_FUNCTION_VALIDATE(args_->GetString(0, &pref_key));
 662   base::DictionaryValue* details = NULL;
 663   EXTENSION_FUNCTION_VALIDATE(args_->GetDictionary(1, &details));
 664
 665   base::Value* value = NULL;
 666   EXTENSION_FUNCTION_VALIDATE(details->Get(keys::kValue, &value));
 667
 668   ExtensionPrefsScope scope = kExtensionPrefsScopeRegular;
 669   if (details->HasKey(keys::kScopeKey)) {
 670     std::string scope_str;
 671     EXTENSION_FUNCTION_VALIDATE(
 672         details->GetString(keys::kScopeKey, &scope_str));
 673
 674     EXTENSION_FUNCTION_VALIDATE(helpers::StringToScope(scope_str, &scope));
 675   }
 676
 677   // Check incognito scope.
 678   bool incognito =
 679       (scope == kExtensionPrefsScopeIncognitoPersistent ||
 680        scope == kExtensionPrefsScopeIncognitoSessionOnly);
 681   if (incognito) {
 682     // Regular profiles can't access incognito unless include_incognito is true.
 683     if (!GetProfile()->IsOffTheRecord() && !include_incognito()) {
 684       error_ = keys::kIncognitoErrorMessage;
 685       return false;
 686     }
 687   } else {
 688     // Incognito profiles can't access regular mode ever, they only exist in
 689     // split mode.
 690     if (GetProfile()->IsOffTheRecord()) {
 691       error_ = "Can't modify regular settings from an incognito context.";
 692       return false;
 693     }
 694   }
 695
 696   if (scope == kExtensionPrefsScopeIncognitoSessionOnly &&
 697       !GetProfile()->HasOffTheRecordProfile()) {
 698     error_ = keys::kIncognitoSessionOnlyErrorMessage;
 699     return false;
 700   }
 701
 702   // Obtain pref.
 703   std::string browser_pref;
 704   if (!ValidateBrowserPref(
 705           pref_key, PreferenceFunction::PERMISSION_TYPE_WRITE, &browser_pref)) {
 706     return false;
 707   }
 708   ExtensionPrefs* prefs = ExtensionPrefs::Get(GetProfile());
 709   const PrefService::Preference* pref =
 710       prefs->pref_service()->FindPreference(browser_pref.c_str());
 711   CHECK(pref);
 712
 713   // Validate new value.
 714   PrefTransformerInterface* transformer =
 715       PrefMapping::GetInstance()->FindTransformerForBrowserPref(browser_pref);
 716   std::string error;
 717   bool bad_message = false;
 718   scoped_ptr<base::Value> browser_pref_value(
 719       transformer->ExtensionToBrowserPref(value, &error, &bad_message));
 720   if (!browser_pref_value) {
 721     error_ = error;
 722     bad_message_ = bad_message;
 723     return false;
 724   }
 725   EXTENSION_FUNCTION_VALIDATE(browser_pref_value->GetType() == pref->GetType());
 726
 727   // Validate also that the stored value can be converted back by the
 728   // transformer.
 729   scoped_ptr<base::Value> extensionPrefValue(
 730       transformer->BrowserToExtensionPref(browser_pref_value.get()));
 731   if (!extensionPrefValue) {
 732     error_ =  ErrorUtils::FormatErrorMessage(kConversionErrorMessage,
 733                                                       pref->name());
 734     bad_message_ = true;
 735     return false;
 736   }
 737
 738   PreferenceAPI::Get(GetProfile())->SetExtensionControlledPref(
 739       extension_id(), browser_pref, scope, browser_pref_value.release());
 740   return true;
 741 }
 742
 743 ClearPreferenceFunction::~ClearPreferenceFunction() { }
 744
 745 bool ClearPreferenceFunction::RunSync() {
 746   std::string pref_key;
 747   EXTENSION_FUNCTION_VALIDATE(args_->GetString(0, &pref_key));
 748   base::DictionaryValue* details = NULL;
 749   EXTENSION_FUNCTION_VALIDATE(args_->GetDictionary(1, &details));
 750
 751   ExtensionPrefsScope scope = kExtensionPrefsScopeRegular;
 752   if (details->HasKey(keys::kScopeKey)) {
 753     std::string scope_str;
 754     EXTENSION_FUNCTION_VALIDATE(
 755         details->GetString(keys::kScopeKey, &scope_str));
 756
 757     EXTENSION_FUNCTION_VALIDATE(helpers::StringToScope(scope_str, &scope));
 758   }
 759
 760   // Check incognito scope.
 761   bool incognito =
 762       (scope == kExtensionPrefsScopeIncognitoPersistent ||
 763        scope == kExtensionPrefsScopeIncognitoSessionOnly);
 764   if (incognito) {
 765     // We don't check incognito permissions here, as an extension should be
 766     // always allowed to clear its own settings.
 767   } else {
 768     // Incognito profiles can't access regular mode ever, they only exist in
 769     // split mode.
 770     if (GetProfile()->IsOffTheRecord()) {
 771       error_ = "Can't modify regular settings from an incognito context.";
 772       return false;
 773     }
 774   }
 775
 776   std::string browser_pref;
 777   if (!ValidateBrowserPref(
 778           pref_key, PreferenceFunction::PERMISSION_TYPE_WRITE, &browser_pref)) {
 779     return false;
 780   }
 781
 782   PreferenceAPI::Get(GetProfile())
 783       ->RemoveExtensionControlledPref(extension_id(), browser_pref, scope);
 784   return true;
 785 }
 786
 787 }  // namespace extensions