src/chrome/browser/ui/webui/help/help_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/help/help_handler.h"
   6
   7 #include <string>
   8
   9 #include "base/basictypes.h"
  10 #include "base/bind.h"
  11 #include "base/bind_helpers.h"
  12 #include "base/command_line.h"
  13 #include "base/strings/string16.h"
  14 #include "base/strings/string_number_conversions.h"
  15 #include "base/strings/utf_string_conversions.h"
  16 #include "base/values.h"
  17 #include "chrome/browser/browser_process.h"
  18 #include "chrome/browser/chrome_notification_types.h"
  19 #include "chrome/browser/google/google_util.h"
  20 #include "chrome/browser/ui/browser.h"
  21 #include "chrome/browser/ui/browser_commands.h"
  22 #include "chrome/browser/ui/browser_finder.h"
  23 #include "chrome/browser/ui/chrome_pages.h"
  24 #include "chrome/common/chrome_version_info.h"
  25 #include "chrome/common/pref_names.h"
  26 #include "chrome/common/url_constants.h"
  27 #include "content/public/browser/browser_thread.h"
  28 #include "content/public/browser/notification_service.h"
  29 #include "content/public/browser/web_ui.h"
  30 #include "content/public/browser/web_ui_data_source.h"
  31 #include "content/public/common/content_client.h"
  32 #include "grit/chromium_strings.h"
  33 #include "grit/generated_resources.h"
  34 #include "grit/google_chrome_strings.h"
  35 #include "ui/base/l10n/l10n_util.h"
  36 #include "ui/base/resource/resource_bundle.h"
  37 #include "v8/include/v8.h"
  38 #include "webkit/common/user_agent/user_agent_util.h"
  39
  40 #if defined(OS_MACOSX)
  41 #include "chrome/browser/mac/obsolete_system.h"
  42 #endif
  43
  44 #if defined(OS_CHROMEOS)
  45 #include "base/files/file_util_proxy.h"
  46 #include "base/i18n/time_formatting.h"
  47 #include "base/prefs/pref_service.h"
  48 #include "base/sys_info.h"
  49 #include "chrome/browser/chromeos/login/user_manager.h"
  50 #include "chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h"
  51 #include "chrome/browser/chromeos/settings/cros_settings.h"
  52 #include "chrome/browser/profiles/profile.h"
  53 #include "chrome/browser/ui/webui/help/help_utils_chromeos.h"
  54 #include "chromeos/chromeos_switches.h"
  55 #include "chromeos/dbus/dbus_thread_manager.h"
  56 #include "chromeos/dbus/power_manager_client.h"
  57 #include "content/public/browser/browser_thread.h"
  58 #endif
  59
  60 using base::ListValue;
  61 using content::BrowserThread;
  62
  63 namespace {
  64
  65 // Returns the browser version as a string.
  66 base::string16 BuildBrowserVersionString() {
  67   chrome::VersionInfo version_info;
  68   DCHECK(version_info.is_valid());
  69
  70   std::string browser_version = version_info.Version();
  71   std::string version_modifier =
  72       chrome::VersionInfo::GetVersionStringModifier();
  73   if (!version_modifier.empty())
  74     browser_version += " " + version_modifier;
  75
  76 #if !defined(GOOGLE_CHROME_BUILD)
  77   browser_version += " (";
  78   browser_version += version_info.LastChange();
  79   browser_version += ")";
  80 #endif
  81
  82   return base::UTF8ToUTF16(browser_version);
  83 }
  84
  85 #if defined(OS_CHROMEOS)
  86
  87 // Returns message that informs user that for update it's better to
  88 // connect to a network of one of the allowed types.
  89 base::string16 GetAllowedConnectionTypesMessage() {
  90   if (help_utils_chromeos::IsUpdateOverCellularAllowed()) {
  91     return l10n_util::GetStringUTF16(IDS_UPGRADE_NETWORK_LIST_CELLULAR_ALLOWED);
  92   } else {
  93     return l10n_util::GetStringUTF16(
  94         IDS_UPGRADE_NETWORK_LIST_CELLULAR_DISALLOWED);
  95   }
  96 }
  97
  98 // Returns true if the device is enterprise managed, false otherwise.
  99 bool IsEnterpriseManaged() {
 100   policy::BrowserPolicyConnectorChromeOS* connector =
 101       g_browser_process->platform_part()->browser_policy_connector_chromeos();
 102   return connector->IsEnterpriseManaged();
 103 }
 104
 105 // Returns true if current user can change channel, false otherwise.
 106 bool CanChangeChannel() {
 107   bool value = false;
 108   chromeos::CrosSettings::Get()->GetBoolean(chromeos::kReleaseChannelDelegated,
 109                                             &value);
 110
 111   // On a managed machine we delegate this setting to the users of the same
 112   // domain only if the policy value is "domain".
 113   if (IsEnterpriseManaged()) {
 114     if (!value)
 115       return false;
 116     // Get the currently logged in user and strip the domain part only.
 117     std::string domain = "";
 118     std::string user = chromeos::UserManager::Get()->GetLoggedInUser()->email();
 119     size_t at_pos = user.find('@');
 120     if (at_pos != std::string::npos && at_pos + 1 < user.length())
 121       domain = user.substr(user.find('@') + 1);
 122     policy::BrowserPolicyConnectorChromeOS* connector =
 123         g_browser_process->platform_part()->browser_policy_connector_chromeos();
 124     return domain == connector->GetEnterpriseDomain();
 125   } else if (chromeos::UserManager::Get()->IsCurrentUserOwner()) {
 126     // On non managed machines we have local owner who is the only one to change
 127     // anything. Ensure that ReleaseChannelDelegated is false.
 128     return !value;
 129   }
 130   return false;
 131 }
 132
 133 #endif  // defined(OS_CHROMEOS)
 134
 135 }  // namespace
 136
 137 HelpHandler::HelpHandler()
 138     : version_updater_(VersionUpdater::Create()),
 139       weak_factory_(this) {
 140 }
 141
 142 HelpHandler::~HelpHandler() {
 143 }
 144
 145 void HelpHandler::GetLocalizedValues(content::WebUIDataSource* source) {
 146   struct L10nResources {
 147     const char* name;
 148     int ids;
 149   };
 150
 151   static L10nResources resources[] = {
 152     { "helpTitle", IDS_HELP_TITLE },
 153     { "aboutTitle", IDS_ABOUT_TAB_TITLE },
 154 #if defined(OS_CHROMEOS)
 155     { "aboutProductTitle", IDS_PRODUCT_OS_NAME },
 156 #else
 157     { "aboutProductTitle", IDS_PRODUCT_NAME },
 158 #endif
 159     { "aboutProductDescription", IDS_ABOUT_PRODUCT_DESCRIPTION },
 160     { "relaunch", IDS_RELAUNCH_BUTTON },
 161 #if defined(OS_CHROMEOS)
 162     { "relaunchAndPowerwash", IDS_RELAUNCH_AND_POWERWASH_BUTTON },
 163 #endif
 164     { "productName", IDS_PRODUCT_NAME },
 165     { "updateCheckStarted", IDS_UPGRADE_CHECK_STARTED },
 166     { "upToDate", IDS_UPGRADE_UP_TO_DATE },
 167     { "updating", IDS_UPGRADE_UPDATING },
 168 #if defined(OS_CHROMEOS)
 169     { "updatingChannelSwitch", IDS_UPGRADE_UPDATING_CHANNEL_SWITCH },
 170 #endif
 171     { "updateAlmostDone", IDS_UPGRADE_SUCCESSFUL_RELAUNCH },
 172 #if defined(OS_CHROMEOS)
 173     { "successfulChannelSwitch", IDS_UPGRADE_SUCCESSFUL_CHANNEL_SWITCH },
 174 #endif
 175     { "getHelpWithChrome", IDS_GET_HELP_USING_CHROME },
 176     { "reportAnIssue", IDS_REPORT_AN_ISSUE },
 177 #if defined(OS_CHROMEOS)
 178     { "platform", IDS_PLATFORM_LABEL },
 179     { "firmware", IDS_ABOUT_PAGE_FIRMWARE },
 180     { "showMoreInfo", IDS_SHOW_MORE_INFO },
 181     { "hideMoreInfo", IDS_HIDE_MORE_INFO },
 182     { "channel", IDS_ABOUT_PAGE_CHANNEL },
 183     { "stable", IDS_ABOUT_PAGE_CHANNEL_STABLE },
 184     { "beta", IDS_ABOUT_PAGE_CHANNEL_BETA },
 185     { "dev", IDS_ABOUT_PAGE_CHANNEL_DEVELOPMENT },
 186     { "channel-changed", IDS_ABOUT_PAGE_CHANNEL_CHANGED },
 187     { "currentChannelStable", IDS_ABOUT_PAGE_CURRENT_CHANNEL_STABLE },
 188     { "currentChannelBeta", IDS_ABOUT_PAGE_CURRENT_CHANNEL_BETA },
 189     { "currentChannelDev", IDS_ABOUT_PAGE_CURRENT_CHANNEL_DEV },
 190     { "currentChannel", IDS_ABOUT_PAGE_CURRENT_CHANNEL },
 191     { "channelChangeButton", IDS_ABOUT_PAGE_CHANNEL_CHANGE_BUTTON },
 192     { "channelChangeDisallowedMessage",
 193       IDS_ABOUT_PAGE_CHANNEL_CHANGE_DISALLOWED_MESSAGE },
 194     { "channelChangePageTitle", IDS_ABOUT_PAGE_CHANNEL_CHANGE_PAGE_TITLE },
 195     { "channelChangePagePowerwashTitle",
 196       IDS_ABOUT_PAGE_CHANNEL_CHANGE_PAGE_POWERWASH_TITLE },
 197     { "channelChangePagePowerwashMessage",
 198       IDS_ABOUT_PAGE_CHANNEL_CHANGE_PAGE_POWERWASH_MESSAGE },
 199     { "channelChangePageDelayedChangeTitle",
 200       IDS_ABOUT_PAGE_CHANNEL_CHANGE_PAGE_DELAYED_CHANGE_TITLE },
 201     { "channelChangePageUnstableTitle",
 202       IDS_ABOUT_PAGE_CHANNEL_CHANGE_PAGE_UNSTABLE_TITLE },
 203     { "channelChangePagePowerwashButton",
 204       IDS_ABOUT_PAGE_CHANNEL_CHANGE_PAGE_POWERWASH_BUTTON },
 205     { "channelChangePageChangeButton",
 206       IDS_ABOUT_PAGE_CHANNEL_CHANGE_PAGE_CHANGE_BUTTON },
 207     { "channelChangePageCancelButton",
 208       IDS_ABOUT_PAGE_CHANNEL_CHANGE_PAGE_CANCEL_BUTTON },
 209     { "webkit", IDS_WEBKIT },
 210     { "userAgent", IDS_ABOUT_VERSION_USER_AGENT },
 211     { "commandLine", IDS_ABOUT_VERSION_COMMAND_LINE },
 212     { "buildDate", IDS_ABOUT_VERSION_BUILD_DATE },
 213 #endif
 214 #if defined(OS_MACOSX)
 215     { "promote", IDS_ABOUT_CHROME_PROMOTE_UPDATER },
 216     { "learnMore", IDS_LEARN_MORE },
 217 #endif
 218   };
 219
 220   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(resources); ++i) {
 221     source->AddString(resources[i].name,
 222                       l10n_util::GetStringUTF16(resources[i].ids));
 223   }
 224
 225 #if defined(OS_MACOSX)
 226   source->AddString("updateObsoleteSystem",
 227                     ObsoleteSystemMac::LocalizedObsoleteSystemString());
 228   source->AddString("updateObsoleteSystemURL",
 229                     chrome::kMac32BitDeprecationURL);
 230 #endif
 231
 232   source->AddString(
 233       "browserVersion",
 234       l10n_util::GetStringFUTF16(IDS_ABOUT_PRODUCT_VERSION,
 235                                  BuildBrowserVersionString()));
 236
 237   base::Time::Exploded exploded_time;
 238   base::Time::Now().LocalExplode(&exploded_time);
 239   source->AddString(
 240       "productCopyright",
 241        l10n_util::GetStringFUTF16(IDS_ABOUT_VERSION_COPYRIGHT,
 242                                   base::IntToString16(exploded_time.year)));
 243
 244   base::string16 license = l10n_util::GetStringFUTF16(
 245       IDS_ABOUT_VERSION_LICENSE,
 246       base::ASCIIToUTF16(chrome::kChromiumProjectURL),
 247       base::ASCIIToUTF16(chrome::kChromeUICreditsURL));
 248   source->AddString("productLicense", license);
 249
 250 #if defined(OS_CHROMEOS)
 251   base::string16 os_license = l10n_util::GetStringFUTF16(
 252       IDS_ABOUT_CROS_VERSION_LICENSE,
 253       base::ASCIIToUTF16(chrome::kChromeUIOSCreditsURL));
 254   source->AddString("productOsLicense", os_license);
 255
 256   base::string16 product_name = l10n_util::GetStringUTF16(IDS_PRODUCT_OS_NAME);
 257   source->AddString(
 258       "channelChangePageDelayedChangeMessage",
 259       l10n_util::GetStringFUTF16(
 260           IDS_ABOUT_PAGE_CHANNEL_CHANGE_PAGE_DELAYED_CHANGE_MESSAGE,
 261           product_name));
 262   source->AddString(
 263       "channelChangePageUnstableMessage",
 264       l10n_util::GetStringFUTF16(
 265           IDS_ABOUT_PAGE_CHANNEL_CHANGE_PAGE_UNSTABLE_MESSAGE,
 266           product_name));
 267
 268   if (CommandLine::ForCurrentProcess()->
 269       HasSwitch(chromeos::switches::kDisableNewChannelSwitcherUI)) {
 270     source->AddBoolean("disableNewChannelSwitcherUI", true);
 271   }
 272 #endif
 273
 274   base::string16 tos = l10n_util::GetStringFUTF16(
 275       IDS_ABOUT_TERMS_OF_SERVICE, base::UTF8ToUTF16(chrome::kChromeUITermsURL));
 276   source->AddString("productTOS", tos);
 277
 278   source->AddString("webkitVersion", webkit_glue::GetWebKitVersion());
 279
 280   source->AddString("jsEngine", "V8");
 281   source->AddString("jsEngineVersion", v8::V8::GetVersion());
 282
 283   source->AddString("userAgentInfo", content::GetUserAgent(GURL()));
 284
 285   CommandLine::StringType command_line =
 286       CommandLine::ForCurrentProcess()->GetCommandLineString();
 287   source->AddString("commandLineInfo", command_line);
 288 }
 289
 290 void HelpHandler::RegisterMessages() {
 291   registrar_.Add(this, chrome::NOTIFICATION_UPGRADE_RECOMMENDED,
 292                  content::NotificationService::AllSources());
 293
 294   web_ui()->RegisterMessageCallback("onPageLoaded",
 295       base::Bind(&HelpHandler::OnPageLoaded, base::Unretained(this)));
 296   web_ui()->RegisterMessageCallback("relaunchNow",
 297       base::Bind(&HelpHandler::RelaunchNow, base::Unretained(this)));
 298   web_ui()->RegisterMessageCallback("openFeedbackDialog",
 299       base::Bind(&HelpHandler::OpenFeedbackDialog, base::Unretained(this)));
 300   web_ui()->RegisterMessageCallback("openHelpPage",
 301       base::Bind(&HelpHandler::OpenHelpPage, base::Unretained(this)));
 302 #if defined(OS_CHROMEOS)
 303   web_ui()->RegisterMessageCallback("setChannel",
 304       base::Bind(&HelpHandler::SetChannel, base::Unretained(this)));
 305   web_ui()->RegisterMessageCallback("relaunchAndPowerwash",
 306       base::Bind(&HelpHandler::RelaunchAndPowerwash, base::Unretained(this)));
 307 #endif
 308 #if defined(OS_MACOSX)
 309   web_ui()->RegisterMessageCallback("promoteUpdater",
 310       base::Bind(&HelpHandler::PromoteUpdater, base::Unretained(this)));
 311 #endif
 312 }
 313
 314 void HelpHandler::Observe(int type, const content::NotificationSource& source,
 315                           const content::NotificationDetails& details) {
 316   switch (type) {
 317     case chrome::NOTIFICATION_UPGRADE_RECOMMENDED: {
 318       // A version update is installed and ready to go. Refresh the UI so the
 319       // correct state will be shown.
 320       version_updater_->CheckForUpdate(
 321           base::Bind(&HelpHandler::SetUpdateStatus, base::Unretained(this))
 322 #if defined(OS_MACOSX)
 323           , base::Bind(&HelpHandler::SetPromotionState, base::Unretained(this))
 324 #endif
 325           );
 326       break;
 327     }
 328     default:
 329       NOTREACHED();
 330   }
 331 }
 332
 333 void HelpHandler::OnPageLoaded(const base::ListValue* args) {
 334 #if defined(OS_CHROMEOS)
 335   // Version information is loaded from a callback
 336   loader_.GetVersion(
 337       chromeos::VersionLoader::VERSION_FULL,
 338       base::Bind(&HelpHandler::OnOSVersion, base::Unretained(this)),
 339       &tracker_);
 340   loader_.GetFirmware(
 341       base::Bind(&HelpHandler::OnOSFirmware, base::Unretained(this)),
 342       &tracker_);
 343
 344   web_ui()->CallJavascriptFunction(
 345       "help.HelpPage.updateEnableReleaseChannel",
 346       base::FundamentalValue(CanChangeChannel()));
 347
 348   base::Time build_time = base::SysInfo::GetLsbReleaseTime();
 349   base::string16 build_date = base::TimeFormatFriendlyDate(build_time);
 350   web_ui()->CallJavascriptFunction("help.HelpPage.setBuildDate",
 351                                    base::StringValue(build_date));
 352 #endif  // defined(OS_CHROMEOS)
 353
 354   version_updater_->CheckForUpdate(
 355       base::Bind(&HelpHandler::SetUpdateStatus, base::Unretained(this))
 356 #if defined(OS_MACOSX)
 357       , base::Bind(&HelpHandler::SetPromotionState, base::Unretained(this))
 358 #endif
 359       );
 360
 361 #if defined(OS_MACOSX)
 362   web_ui()->CallJavascriptFunction(
 363       "help.HelpPage.setObsoleteSystem",
 364       base::FundamentalValue(ObsoleteSystemMac::Is32BitObsoleteNowOrSoon() &&
 365                              ObsoleteSystemMac::Has32BitOnlyCPU()));
 366   web_ui()->CallJavascriptFunction(
 367       "help.HelpPage.setObsoleteSystemEndOfTheLine",
 368       base::FundamentalValue(ObsoleteSystemMac::Is32BitObsoleteNowOrSoon() &&
 369                              ObsoleteSystemMac::Is32BitEndOfTheLine()));
 370 #endif
 371
 372 #if defined(OS_CHROMEOS)
 373   web_ui()->CallJavascriptFunction(
 374       "help.HelpPage.updateIsEnterpriseManaged",
 375       base::FundamentalValue(IsEnterpriseManaged()));
 376   // First argument to GetChannel() is a flag that indicates whether
 377   // current channel should be returned (if true) or target channel
 378   // (otherwise).
 379   version_updater_->GetChannel(true,
 380       base::Bind(&HelpHandler::OnCurrentChannel, weak_factory_.GetWeakPtr()));
 381   version_updater_->GetChannel(false,
 382       base::Bind(&HelpHandler::OnTargetChannel, weak_factory_.GetWeakPtr()));
 383 #endif
 384 }
 385
 386 #if defined(OS_MACOSX)
 387 void HelpHandler::PromoteUpdater(const base::ListValue* args) {
 388   version_updater_->PromoteUpdater();
 389 }
 390 #endif
 391
 392 void HelpHandler::RelaunchNow(const base::ListValue* args) {
 393   DCHECK(args->empty());
 394   version_updater_->RelaunchBrowser();
 395 }
 396
 397 void HelpHandler::OpenFeedbackDialog(const base::ListValue* args) {
 398   DCHECK(args->empty());
 399   Browser* browser = chrome::FindBrowserWithWebContents(
 400       web_ui()->GetWebContents());
 401   chrome::OpenFeedbackDialog(browser);
 402 }
 403
 404 void HelpHandler::OpenHelpPage(const base::ListValue* args) {
 405   DCHECK(args->empty());
 406   Browser* browser = chrome::FindBrowserWithWebContents(
 407       web_ui()->GetWebContents());
 408   chrome::ShowHelp(browser, chrome::HELP_SOURCE_WEBUI);
 409 }
 410
 411 #if defined(OS_CHROMEOS)
 412
 413 void HelpHandler::SetChannel(const base::ListValue* args) {
 414   DCHECK(args->GetSize() == 2);
 415
 416   if (!CanChangeChannel()) {
 417     LOG(WARNING) << "Non-owner tried to change release track.";
 418     return;
 419   }
 420
 421   base::string16 channel;
 422   bool is_powerwash_allowed;
 423   if (!args->GetString(0, &channel) ||
 424       !args->GetBoolean(1, &is_powerwash_allowed)) {
 425     LOG(ERROR) << "Can't parse SetChannel() args";
 426     return;
 427   }
 428
 429   version_updater_->SetChannel(base::UTF16ToUTF8(channel),
 430                                is_powerwash_allowed);
 431   if (chromeos::UserManager::Get()->IsCurrentUserOwner()) {
 432     // Check for update after switching release channel.
 433     version_updater_->CheckForUpdate(base::Bind(&HelpHandler::SetUpdateStatus,
 434                                                 base::Unretained(this)));
 435   }
 436 }
 437
 438 void HelpHandler::RelaunchAndPowerwash(const base::ListValue* args) {
 439   DCHECK(args->empty());
 440
 441   if (IsEnterpriseManaged())
 442     return;
 443
 444   PrefService* prefs = g_browser_process->local_state();
 445   prefs->SetBoolean(prefs::kFactoryResetRequested, true);
 446   prefs->CommitPendingWrite();
 447
 448   // Perform sign out. Current chrome process will then terminate, new one will
 449   // be launched (as if it was a restart).
 450   chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->RequestRestart();
 451 }
 452
 453 #endif  // defined(OS_CHROMEOS)
 454
 455 void HelpHandler::SetUpdateStatus(VersionUpdater::Status status,
 456                                   int progress, const base::string16& message) {
 457   // Only UPDATING state should have progress set.
 458   DCHECK(status == VersionUpdater::UPDATING || progress == 0);
 459
 460   std::string status_str;
 461   switch (status) {
 462   case VersionUpdater::CHECKING:
 463     status_str = "checking";
 464     break;
 465   case VersionUpdater::UPDATING:
 466     status_str = "updating";
 467     break;
 468   case VersionUpdater::NEARLY_UPDATED:
 469     status_str = "nearly_updated";
 470     break;
 471   case VersionUpdater::UPDATED:
 472     status_str = "updated";
 473     break;
 474   case VersionUpdater::FAILED:
 475   case VersionUpdater::FAILED_OFFLINE:
 476   case VersionUpdater::FAILED_CONNECTION_TYPE_DISALLOWED:
 477     status_str = "failed";
 478     break;
 479   case VersionUpdater::DISABLED:
 480     status_str = "disabled";
 481     break;
 482   }
 483
 484   web_ui()->CallJavascriptFunction("help.HelpPage.setUpdateStatus",
 485                                    base::StringValue(status_str),
 486                                    base::StringValue(message));
 487
 488   if (status == VersionUpdater::UPDATING) {
 489     web_ui()->CallJavascriptFunction("help.HelpPage.setProgress",
 490                                      base::FundamentalValue(progress));
 491   }
 492
 493 #if defined(OS_CHROMEOS)
 494   if (status == VersionUpdater::FAILED_OFFLINE ||
 495       status == VersionUpdater::FAILED_CONNECTION_TYPE_DISALLOWED) {
 496     base::string16 types_msg = GetAllowedConnectionTypesMessage();
 497     if (!types_msg.empty()) {
 498       web_ui()->CallJavascriptFunction(
 499           "help.HelpPage.setAndShowAllowedConnectionTypesMsg",
 500           base::StringValue(types_msg));
 501     } else {
 502       web_ui()->CallJavascriptFunction(
 503           "help.HelpPage.showAllowedConnectionTypesMsg",
 504           base::FundamentalValue(false));
 505     }
 506   } else {
 507     web_ui()->CallJavascriptFunction(
 508         "help.HelpPage.showAllowedConnectionTypesMsg",
 509         base::FundamentalValue(false));
 510   }
 511 #endif  // defined(OS_CHROMEOS)
 512 }
 513
 514 #if defined(OS_MACOSX)
 515 void HelpHandler::SetPromotionState(VersionUpdater::PromotionState state) {
 516   std::string state_str;
 517   switch (state) {
 518   case VersionUpdater::PROMOTE_HIDDEN:
 519     state_str = "hidden";
 520     break;
 521   case VersionUpdater::PROMOTE_ENABLED:
 522     state_str = "enabled";
 523     break;
 524   case VersionUpdater::PROMOTE_DISABLED:
 525     state_str = "disabled";
 526     break;
 527   }
 528
 529   web_ui()->CallJavascriptFunction("help.HelpPage.setPromotionState",
 530                                    base::StringValue(state_str));
 531 }
 532 #endif  // defined(OS_MACOSX)
 533
 534 #if defined(OS_CHROMEOS)
 535 void HelpHandler::OnOSVersion(const std::string& version) {
 536   web_ui()->CallJavascriptFunction("help.HelpPage.setOSVersion",
 537                                    base::StringValue(version));
 538 }
 539
 540 void HelpHandler::OnOSFirmware(const std::string& firmware) {
 541   web_ui()->CallJavascriptFunction("help.HelpPage.setOSFirmware",
 542                                    base::StringValue(firmware));
 543 }
 544
 545 void HelpHandler::OnCurrentChannel(const std::string& channel) {
 546   web_ui()->CallJavascriptFunction(
 547       "help.HelpPage.updateCurrentChannel", base::StringValue(channel));
 548 }
 549
 550 void HelpHandler::OnTargetChannel(const std::string& channel) {
 551   web_ui()->CallJavascriptFunction(
 552       "help.HelpPage.updateTargetChannel", base::StringValue(channel));
 553 }
 554
 555 #endif // defined(OS_CHROMEOS)