chrome/browser/ui/prefs/prefs_tab_helper.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/prefs/prefs_tab_helper.h"
   6
   7 #include <set>
   8 #include <string>
   9
  10 #include "base/memory/singleton.h"
  11 #include "base/prefs/overlay_user_pref_store.h"
  12 #include "base/prefs/pref_change_registrar.h"
  13 #include "base/prefs/pref_service.h"
  14 #include "base/strings/string_number_conversions.h"
  15 #include "base/strings/string_util.h"
  16 #include "base/strings/stringprintf.h"
  17 #include "base/strings/utf_string_conversions.h"
  18 #include "chrome/browser/browser_process.h"
  19 #include "chrome/browser/chrome_notification_types.h"
  20 #include "chrome/browser/profiles/incognito_helpers.h"
  21 #include "chrome/browser/profiles/profile.h"
  22 #include "chrome/browser/renderer_preferences_util.h"
  23 #include "chrome/browser/ui/zoom/chrome_zoom_level_prefs.h"
  24 #include "chrome/common/pref_font_webkit_names.h"
  25 #include "chrome/common/pref_names.h"
  26 #include "chrome/common/pref_names_util.h"
  27 #include "chrome/grit/locale_settings.h"
  28 #include "components/keyed_service/content/browser_context_dependency_manager.h"
  29 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
  30 #include "components/keyed_service/core/keyed_service.h"
  31 #include "components/pref_registry/pref_registry_syncable.h"
  32 #include "content/public/browser/notification_details.h"
  33 #include "content/public/browser/notification_service.h"
  34 #include "content/public/browser/render_view_host.h"
  35 #include "content/public/browser/web_contents.h"
  36 #include "content/public/common/renderer_preferences.h"
  37 #include "content/public/common/web_preferences.h"
  38 #include "grit/platform_locale_settings.h"
  39 #include "third_party/icu/source/common/unicode/uchar.h"
  40 #include "third_party/icu/source/common/unicode/uscript.h"
  41 #include "ui/base/l10n/l10n_util.h"
  42
  43 #if defined(OS_POSIX) && !defined(OS_MACOSX) && defined(ENABLE_THEMES)
  44 #include "chrome/browser/themes/theme_service.h"
  45 #include "chrome/browser/themes/theme_service_factory.h"
  46 #endif
  47
  48 #if defined(OS_WIN)
  49 #include "base/win/windows_version.h"
  50 #endif
  51
  52 using content::WebContents;
  53 using content::WebPreferences;
  54
  55 DEFINE_WEB_CONTENTS_USER_DATA_KEY(PrefsTabHelper);
  56
  57 namespace {
  58
  59 // The list of prefs we want to observe.
  60 const char* kPrefsToObserve[] = {
  61 #if defined(ENABLE_EXTENSIONS)
  62   prefs::kAnimationPolicy,
  63 #endif
  64   prefs::kDefaultCharset,
  65   prefs::kDisable3DAPIs,
  66   prefs::kEnableHyperlinkAuditing,
  67   prefs::kWebKitAllowDisplayingInsecureContent,
  68   prefs::kWebKitAllowRunningInsecureContent,
  69   prefs::kWebKitDefaultFixedFontSize,
  70   prefs::kWebKitDefaultFontSize,
  71   prefs::kWebKitDomPasteEnabled,
  72 #if defined(OS_ANDROID)
  73   prefs::kWebKitFontScaleFactor,
  74   prefs::kWebKitForceEnableZoom,
  75   prefs::kWebKitPasswordEchoEnabled,
  76 #endif
  77   prefs::kWebKitJavascriptCanOpenWindowsAutomatically,
  78   prefs::kWebKitJavascriptEnabled,
  79   prefs::kWebKitLoadsImagesAutomatically,
  80   prefs::kWebKitMinimumFontSize,
  81   prefs::kWebKitMinimumLogicalFontSize,
  82   prefs::kWebKitPluginsEnabled,
  83   prefs::kWebkitTabsToLinks,
  84   prefs::kWebKitTextAreasAreResizable,
  85   prefs::kWebKitUsesUniversalDetector,
  86   prefs::kWebKitWebSecurityEnabled,
  87 };
  88
  89 const int kPrefsToObserveLength = arraysize(kPrefsToObserve);
  90
  91 #if !defined(OS_ANDROID)
  92 // Registers a preference under the path |pref_name| for each script used for
  93 // per-script font prefs.
  94 // For example, for WEBKIT_WEBPREFS_FONTS_SERIF ("fonts.serif"):
  95 // "fonts.serif.Arab", "fonts.serif.Hang", etc. are registered.
  96 // |fonts_with_defaults| contains all |pref_names| already registered since they
  97 // have a specified default value.
  98 // On Android there are no default values for these properties and there is no
  99 // way to set them (because extensions are not supported so the Font Settings
 100 // API cannot be used), so we can avoid registering them altogether.
 101 void RegisterFontFamilyPrefs(user_prefs::PrefRegistrySyncable* registry,
 102                              const std::set<std::string>& fonts_with_defaults) {
 103   // Expand the font concatenated with script name so this stays at RO memory
 104   // rather than allocated in heap.
 105   static const char* const kFontFamilyMap[] = {
 106 #define EXPAND_SCRIPT_FONT(map_name, script_name) map_name "." script_name,
 107
 108 #include "chrome/common/pref_font_script_names-inl.h"
 109 ALL_FONT_SCRIPTS(WEBKIT_WEBPREFS_FONTS_CURSIVE)
 110 ALL_FONT_SCRIPTS(WEBKIT_WEBPREFS_FONTS_FANTASY)
 111 ALL_FONT_SCRIPTS(WEBKIT_WEBPREFS_FONTS_FIXED)
 112 ALL_FONT_SCRIPTS(WEBKIT_WEBPREFS_FONTS_PICTOGRAPH)
 113 ALL_FONT_SCRIPTS(WEBKIT_WEBPREFS_FONTS_SANSERIF)
 114 ALL_FONT_SCRIPTS(WEBKIT_WEBPREFS_FONTS_SERIF)
 115 ALL_FONT_SCRIPTS(WEBKIT_WEBPREFS_FONTS_STANDARD)
 116
 117 #undef EXPAND_SCRIPT_FONT
 118   };
 119
 120   for (size_t i = 0; i < arraysize(kFontFamilyMap); ++i) {
 121     const char* pref_name = kFontFamilyMap[i];
 122     if (fonts_with_defaults.find(pref_name) == fonts_with_defaults.end()) {
 123       // We haven't already set a default value for this font preference, so set
 124       // an empty string as the default.
 125       registry->RegisterStringPref(pref_name, std::string());
 126     }
 127   }
 128 }
 129 #endif  // !defined(OS_ANDROID)
 130
 131 // Registers |obs| to observe per-script font prefs under the path |map_name|.
 132 // On android, there's no exposed way to change these prefs, so we can save
 133 // ~715KB of heap and some startup cycles by avoiding observing these prefs
 134 // since they will never change.
 135 void RegisterFontFamilyMapObserver(
 136     PrefChangeRegistrar* registrar,
 137     const char* map_name,
 138     const PrefChangeRegistrar::NamedChangeCallback& obs) {
 139   DCHECK(base::StartsWith(map_name, "webkit.webprefs.",
 140                           base::CompareCase::SENSITIVE));
 141
 142   for (size_t i = 0; i < prefs::kWebKitScriptsForFontFamilyMapsLength; ++i) {
 143     const char* script = prefs::kWebKitScriptsForFontFamilyMaps[i];
 144     registrar->Add(base::StringPrintf("%s.%s", map_name, script), obs);
 145   }
 146 }
 147
 148 #if defined(OS_WIN)
 149 // On Windows with antialising we want to use an alternate fixed font like
 150 // Consolas, which looks much better than Courier New.
 151 bool ShouldUseAlternateDefaultFixedFont(const std::string& script) {
 152   if (!base::StartsWith(script, "courier",
 153                         base::CompareCase::INSENSITIVE_ASCII))
 154     return false;
 155   UINT smooth_type = 0;
 156   SystemParametersInfo(SPI_GETFONTSMOOTHINGTYPE, 0, &smooth_type, 0);
 157   return (base::win::GetVersion() >= base::win::VERSION_WIN7) &&
 158          (smooth_type == FE_FONTSMOOTHINGCLEARTYPE);
 159 }
 160 #endif
 161
 162 struct FontDefault {
 163   const char* pref_name;
 164   int resource_id;
 165 };
 166
 167 // Font pref defaults.  The prefs that have defaults vary by platform, since not
 168 // all platforms have fonts for all scripts for all generic families.
 169 // TODO(falken): add proper defaults when possible for all
 170 // platforms/scripts/generic families.
 171 const FontDefault kFontDefaults[] = {
 172   { prefs::kWebKitStandardFontFamily, IDS_STANDARD_FONT_FAMILY },
 173   { prefs::kWebKitFixedFontFamily, IDS_FIXED_FONT_FAMILY },
 174   { prefs::kWebKitSerifFontFamily, IDS_SERIF_FONT_FAMILY },
 175   { prefs::kWebKitSansSerifFontFamily, IDS_SANS_SERIF_FONT_FAMILY },
 176   { prefs::kWebKitCursiveFontFamily, IDS_CURSIVE_FONT_FAMILY },
 177   { prefs::kWebKitFantasyFontFamily, IDS_FANTASY_FONT_FAMILY },
 178   { prefs::kWebKitPictographFontFamily, IDS_PICTOGRAPH_FONT_FAMILY },
 179 #if defined(OS_CHROMEOS) || defined(OS_MACOSX) || defined(OS_WIN)
 180   { prefs::kWebKitStandardFontFamilyJapanese,
 181     IDS_STANDARD_FONT_FAMILY_JAPANESE },
 182   { prefs::kWebKitFixedFontFamilyJapanese, IDS_FIXED_FONT_FAMILY_JAPANESE },
 183   { prefs::kWebKitSerifFontFamilyJapanese, IDS_SERIF_FONT_FAMILY_JAPANESE },
 184   { prefs::kWebKitSansSerifFontFamilyJapanese,
 185     IDS_SANS_SERIF_FONT_FAMILY_JAPANESE },
 186   { prefs::kWebKitStandardFontFamilyKorean, IDS_STANDARD_FONT_FAMILY_KOREAN },
 187   { prefs::kWebKitSerifFontFamilyKorean, IDS_SERIF_FONT_FAMILY_KOREAN },
 188   { prefs::kWebKitSansSerifFontFamilyKorean,
 189     IDS_SANS_SERIF_FONT_FAMILY_KOREAN },
 190   { prefs::kWebKitStandardFontFamilySimplifiedHan,
 191     IDS_STANDARD_FONT_FAMILY_SIMPLIFIED_HAN },
 192   { prefs::kWebKitSerifFontFamilySimplifiedHan,
 193     IDS_SERIF_FONT_FAMILY_SIMPLIFIED_HAN },
 194   { prefs::kWebKitSansSerifFontFamilySimplifiedHan,
 195     IDS_SANS_SERIF_FONT_FAMILY_SIMPLIFIED_HAN },
 196   { prefs::kWebKitStandardFontFamilyTraditionalHan,
 197     IDS_STANDARD_FONT_FAMILY_TRADITIONAL_HAN },
 198   { prefs::kWebKitSerifFontFamilyTraditionalHan,
 199     IDS_SERIF_FONT_FAMILY_TRADITIONAL_HAN },
 200   { prefs::kWebKitSansSerifFontFamilyTraditionalHan,
 201     IDS_SANS_SERIF_FONT_FAMILY_TRADITIONAL_HAN },
 202 #endif
 203 #if defined(OS_CHROMEOS)
 204   { prefs::kWebKitStandardFontFamilyArabic, IDS_STANDARD_FONT_FAMILY_ARABIC },
 205   { prefs::kWebKitSerifFontFamilyArabic, IDS_SERIF_FONT_FAMILY_ARABIC },
 206   { prefs::kWebKitSansSerifFontFamilyArabic,
 207     IDS_SANS_SERIF_FONT_FAMILY_ARABIC },
 208   { prefs::kWebKitFixedFontFamilyKorean, IDS_FIXED_FONT_FAMILY_KOREAN },
 209   { prefs::kWebKitFixedFontFamilySimplifiedHan,
 210     IDS_FIXED_FONT_FAMILY_SIMPLIFIED_HAN },
 211   { prefs::kWebKitFixedFontFamilyTraditionalHan,
 212     IDS_FIXED_FONT_FAMILY_TRADITIONAL_HAN },
 213 #elif defined(OS_WIN)
 214   { prefs::kWebKitFixedFontFamilyArabic, IDS_FIXED_FONT_FAMILY_ARABIC },
 215   { prefs::kWebKitSansSerifFontFamilyArabic,
 216     IDS_SANS_SERIF_FONT_FAMILY_ARABIC },
 217   { prefs::kWebKitStandardFontFamilyCyrillic,
 218     IDS_STANDARD_FONT_FAMILY_CYRILLIC },
 219   { prefs::kWebKitFixedFontFamilyCyrillic, IDS_FIXED_FONT_FAMILY_CYRILLIC },
 220   { prefs::kWebKitSerifFontFamilyCyrillic, IDS_SERIF_FONT_FAMILY_CYRILLIC },
 221   { prefs::kWebKitSansSerifFontFamilyCyrillic,
 222     IDS_SANS_SERIF_FONT_FAMILY_CYRILLIC },
 223   { prefs::kWebKitStandardFontFamilyGreek, IDS_STANDARD_FONT_FAMILY_GREEK },
 224   { prefs::kWebKitFixedFontFamilyGreek, IDS_FIXED_FONT_FAMILY_GREEK },
 225   { prefs::kWebKitSerifFontFamilyGreek, IDS_SERIF_FONT_FAMILY_GREEK },
 226   { prefs::kWebKitSansSerifFontFamilyGreek, IDS_SANS_SERIF_FONT_FAMILY_GREEK },
 227   { prefs::kWebKitFixedFontFamilyKorean, IDS_FIXED_FONT_FAMILY_KOREAN },
 228   { prefs::kWebKitCursiveFontFamilyKorean, IDS_CURSIVE_FONT_FAMILY_KOREAN },
 229   { prefs::kWebKitFixedFontFamilySimplifiedHan,
 230     IDS_FIXED_FONT_FAMILY_SIMPLIFIED_HAN },
 231   { prefs::kWebKitFixedFontFamilyTraditionalHan,
 232     IDS_FIXED_FONT_FAMILY_TRADITIONAL_HAN },
 233 #endif
 234 };
 235
 236 const size_t kFontDefaultsLength = arraysize(kFontDefaults);
 237
 238 // Returns the script of the font pref |pref_name|.  For example, suppose
 239 // |pref_name| is "webkit.webprefs.fonts.serif.Hant".  Since the script code for
 240 // the script name "Hant" is USCRIPT_TRADITIONAL_HAN, the function returns
 241 // USCRIPT_TRADITIONAL_HAN.  |pref_name| must be a valid font pref name.
 242 UScriptCode GetScriptOfFontPref(const char* pref_name) {
 243   // ICU script names are four letters.
 244   static const size_t kScriptNameLength = 4;
 245
 246   size_t len = strlen(pref_name);
 247   DCHECK_GT(len, kScriptNameLength);
 248   const char* scriptName = &pref_name[len - kScriptNameLength];
 249   int32 code = u_getPropertyValueEnum(UCHAR_SCRIPT, scriptName);
 250   DCHECK(code >= 0 && code < USCRIPT_CODE_LIMIT);
 251   return static_cast<UScriptCode>(code);
 252 }
 253
 254 // If |scriptCode| is a member of a family of "similar" script codes, returns
 255 // the script code in that family that is used in font pref names.  For example,
 256 // USCRIPT_HANGUL and USCRIPT_KOREAN are considered equivalent for the purposes
 257 // of font selection.  Chrome uses the script code USCRIPT_HANGUL (script name
 258 // "Hang") in Korean font pref names (for example,
 259 // "webkit.webprefs.fonts.serif.Hang").  So, if |scriptCode| is USCRIPT_KOREAN,
 260 // the function returns USCRIPT_HANGUL.  If |scriptCode| is not a member of such
 261 // a family, returns |scriptCode|.
 262 UScriptCode GetScriptForFontPrefMatching(UScriptCode scriptCode) {
 263   switch (scriptCode) {
 264   case USCRIPT_HIRAGANA:
 265   case USCRIPT_KATAKANA:
 266   case USCRIPT_KATAKANA_OR_HIRAGANA:
 267     return USCRIPT_JAPANESE;
 268   case USCRIPT_KOREAN:
 269     return USCRIPT_HANGUL;
 270   default:
 271     return scriptCode;
 272   }
 273 }
 274
 275 // Returns the primary script used by the browser's UI locale.  For example, if
 276 // the locale is "ru", the function returns USCRIPT_CYRILLIC, and if the locale
 277 // is "en", the function returns USCRIPT_LATIN.
 278 UScriptCode GetScriptOfBrowserLocale() {
 279   std::string locale = g_browser_process->GetApplicationLocale();
 280
 281   // For Chinese locales, uscript_getCode() just returns USCRIPT_HAN but our
 282   // per-script fonts are for USCRIPT_SIMPLIFIED_HAN and
 283   // USCRIPT_TRADITIONAL_HAN.
 284   if (locale == "zh-CN")
 285     return USCRIPT_SIMPLIFIED_HAN;
 286   if (locale == "zh-TW")
 287     return USCRIPT_TRADITIONAL_HAN;
 288
 289   UScriptCode code = USCRIPT_INVALID_CODE;
 290   UErrorCode err = U_ZERO_ERROR;
 291   uscript_getCode(locale.c_str(), &code, 1, &err);
 292
 293   // Ignore the error that multiple scripts could be returned, since we only
 294   // want one script.
 295   if (U_FAILURE(err) && err != U_BUFFER_OVERFLOW_ERROR)
 296     code = USCRIPT_INVALID_CODE;
 297   return GetScriptForFontPrefMatching(code);
 298 }
 299
 300 // Sets a font family pref in |prefs| to |pref_value|.
 301 void OverrideFontFamily(WebPreferences* prefs,
 302                         const std::string& generic_family,
 303                         const std::string& script,
 304                         const std::string& pref_value) {
 305   content::ScriptFontFamilyMap* map = NULL;
 306   if (generic_family == "standard")
 307     map = &prefs->standard_font_family_map;
 308   else if (generic_family == "fixed")
 309     map = &prefs->fixed_font_family_map;
 310   else if (generic_family == "serif")
 311     map = &prefs->serif_font_family_map;
 312   else if (generic_family == "sansserif")
 313     map = &prefs->sans_serif_font_family_map;
 314   else if (generic_family == "cursive")
 315     map = &prefs->cursive_font_family_map;
 316   else if (generic_family == "fantasy")
 317     map = &prefs->fantasy_font_family_map;
 318   else if (generic_family == "pictograph")
 319     map = &prefs->pictograph_font_family_map;
 320   else
 321     NOTREACHED() << "Unknown generic font family: " << generic_family;
 322   (*map)[script] = base::UTF8ToUTF16(pref_value);
 323 }
 324
 325 void RegisterLocalizedFontPref(user_prefs::PrefRegistrySyncable* registry,
 326                                const char* path,
 327                                int default_message_id) {
 328   int val = 0;
 329   bool success = base::StringToInt(l10n_util::GetStringUTF8(
 330       default_message_id), &val);
 331   DCHECK(success);
 332   registry->RegisterIntegerPref(path, val);
 333 }
 334
 335 }  // namespace
 336
 337 // Watching all these settings per tab is slow when a user has a lot of tabs and
 338 // and they use session restore. So watch them once per profile.
 339 // http://crbug.com/452693
 340 class PrefWatcher : public KeyedService {
 341  public:
 342   explicit PrefWatcher(Profile* profile) : profile_(profile) {
 343     pref_change_registrar_.Init(profile_->GetPrefs());
 344
 345     base::Closure renderer_callback = base::Bind(
 346         &PrefWatcher::UpdateRendererPreferences, base::Unretained(this));
 347     pref_change_registrar_.Add(prefs::kAcceptLanguages, renderer_callback);
 348     pref_change_registrar_.Add(prefs::kEnableDoNotTrack, renderer_callback);
 349     pref_change_registrar_.Add(prefs::kEnableReferrers, renderer_callback);
 350
 351 #if defined(ENABLE_WEBRTC)
 352     pref_change_registrar_.Add(prefs::kWebRTCMultipleRoutesEnabled,
 353                                renderer_callback);
 354 #endif
 355
 356 #if !defined(OS_MACOSX)
 357     pref_change_registrar_.Add(prefs::kFullscreenAllowed, renderer_callback);
 358 #endif
 359
 360     PrefChangeRegistrar::NamedChangeCallback webkit_callback = base::Bind(
 361         &PrefWatcher::OnWebPrefChanged, base::Unretained(this));
 362     for (int i = 0; i < kPrefsToObserveLength; ++i) {
 363       const char* pref_name = kPrefsToObserve[i];
 364       pref_change_registrar_.Add(pref_name, webkit_callback);
 365     }
 366
 367     RegisterFontFamilyMapObserver(&pref_change_registrar_,
 368                                   prefs::kWebKitStandardFontFamilyMap,
 369                                   webkit_callback);
 370     RegisterFontFamilyMapObserver(&pref_change_registrar_,
 371                                   prefs::kWebKitFixedFontFamilyMap,
 372                                   webkit_callback);
 373     RegisterFontFamilyMapObserver(&pref_change_registrar_,
 374                                   prefs::kWebKitSerifFontFamilyMap,
 375                                   webkit_callback);
 376     RegisterFontFamilyMapObserver(&pref_change_registrar_,
 377                                   prefs::kWebKitSansSerifFontFamilyMap,
 378                                   webkit_callback);
 379     RegisterFontFamilyMapObserver(&pref_change_registrar_,
 380                                   prefs::kWebKitCursiveFontFamilyMap,
 381                                   webkit_callback);
 382     RegisterFontFamilyMapObserver(&pref_change_registrar_,
 383                                   prefs::kWebKitFantasyFontFamilyMap,
 384                                   webkit_callback);
 385     RegisterFontFamilyMapObserver(&pref_change_registrar_,
 386                                   prefs::kWebKitPictographFontFamilyMap,
 387                                   webkit_callback);
 388   }
 389
 390   static PrefWatcher* Get(Profile* profile);
 391
 392   void RegisterHelper(PrefsTabHelper* helper) {
 393     helpers_.insert(helper);
 394   }
 395
 396   void UnregisterHelper(PrefsTabHelper* helper) {
 397     helpers_.erase(helper);
 398   }
 399
 400  private:
 401   // KeyedService overrides:
 402   void Shutdown() override {
 403     pref_change_registrar_.RemoveAll();
 404   }
 405
 406   void UpdateRendererPreferences() {
 407     for (const auto& helper : helpers_)
 408       helper->UpdateRendererPreferences();
 409   }
 410
 411   void OnWebPrefChanged(const std::string& pref_name) {
 412     for (const auto& helper : helpers_)
 413       helper->OnWebPrefChanged(pref_name);
 414   }
 415
 416   Profile* profile_;
 417   PrefChangeRegistrar pref_change_registrar_;
 418   std::set<PrefsTabHelper*> helpers_;
 419 };
 420
 421 class PrefWatcherFactory : public BrowserContextKeyedServiceFactory {
 422  public:
 423   static PrefWatcher* GetForProfile(Profile* profile) {
 424     return static_cast<PrefWatcher*>(
 425         GetInstance()->GetServiceForBrowserContext(profile, true));
 426   }
 427
 428   static PrefWatcherFactory* GetInstance() {
 429     return Singleton<PrefWatcherFactory>::get();
 430   }
 431
 432  private:
 433   friend struct DefaultSingletonTraits<PrefWatcherFactory>;
 434
 435   PrefWatcherFactory() : BrowserContextKeyedServiceFactory(
 436       "PrefWatcher",
 437       BrowserContextDependencyManager::GetInstance()) {
 438   }
 439
 440   ~PrefWatcherFactory() override {}
 441
 442   // BrowserContextKeyedServiceFactory:
 443   KeyedService* BuildServiceInstanceFor(
 444       content::BrowserContext* browser_context) const override {
 445     return new PrefWatcher(Profile::FromBrowserContext(browser_context));
 446   }
 447
 448   content::BrowserContext* GetBrowserContextToUse(
 449       content::BrowserContext* context) const override {
 450     return chrome::GetBrowserContextOwnInstanceInIncognito(context);
 451   }
 452 };
 453
 454 // static
 455 PrefWatcher* PrefWatcher::Get(Profile* profile) {
 456   return PrefWatcherFactory::GetForProfile(profile);
 457 }
 458
 459 PrefsTabHelper::PrefsTabHelper(WebContents* contents)
 460     : web_contents_(contents),
 461       profile_(Profile::FromBrowserContext(web_contents_->GetBrowserContext())),
 462       weak_ptr_factory_(this) {
 463   PrefService* prefs = profile_->GetPrefs();
 464   if (prefs) {
 465     // If the tab is in an incognito profile, we track changes in the default
 466     // zoom level of the parent profile instead.
 467     Profile* profile_to_track = profile_->GetOriginalProfile();
 468     chrome::ChromeZoomLevelPrefs* zoom_level_prefs =
 469         profile_to_track->GetZoomLevelPrefs();
 470
 471     base::Closure renderer_callback = base::Bind(
 472         &PrefsTabHelper::UpdateRendererPreferences, base::Unretained(this));
 473     // Tests should not need to create a ZoomLevelPrefs.
 474     if (zoom_level_prefs) {
 475       default_zoom_level_subscription_ =
 476           zoom_level_prefs->RegisterDefaultZoomLevelCallback(renderer_callback);
 477     }
 478
 479     PrefWatcher::Get(profile_)->RegisterHelper(this);
 480   }
 481
 482   content::RendererPreferences* render_prefs =
 483       web_contents_->GetMutableRendererPrefs();
 484   renderer_preferences_util::UpdateFromSystemSettings(render_prefs,
 485                                                       profile_,
 486                                                       web_contents_);
 487
 488 #if defined(OS_POSIX) && !defined(OS_MACOSX) && defined(ENABLE_THEMES)
 489   registrar_.Add(this,
 490                  chrome::NOTIFICATION_BROWSER_THEME_CHANGED,
 491                  content::Source<ThemeService>(
 492                      ThemeServiceFactory::GetForProfile(profile_)));
 493 #endif
 494 #if defined(USE_AURA)
 495   registrar_.Add(this,
 496                  chrome::NOTIFICATION_BROWSER_FLING_CURVE_PARAMETERS_CHANGED,
 497                  content::NotificationService::AllSources());
 498 #endif
 499 }
 500
 501 PrefsTabHelper::~PrefsTabHelper() {
 502   PrefWatcher::Get(profile_)->UnregisterHelper(this);
 503 }
 504
 505 // static
 506 void PrefsTabHelper::InitIncognitoUserPrefStore(
 507     OverlayUserPrefStore* pref_store) {
 508   // List of keys that cannot be changed in the user prefs file by the incognito
 509   // profile.  All preferences that store information about the browsing history
 510   // or behavior of the user should have this property.
 511   pref_store->RegisterOverlayPref(prefs::kBrowserWindowPlacement);
 512   pref_store->RegisterOverlayPref(prefs::kSaveFileDefaultDirectory);
 513 #if defined(OS_ANDROID) || defined(OS_IOS)
 514   pref_store->RegisterOverlayPref(prefs::kProxy);
 515 #endif  // defined(OS_ANDROID) || defined(OS_IOS)
 516 }
 517
 518 // static
 519 void PrefsTabHelper::RegisterProfilePrefs(
 520     user_prefs::PrefRegistrySyncable* registry) {
 521   WebPreferences pref_defaults;
 522   registry->RegisterBooleanPref(prefs::kWebKitJavascriptEnabled,
 523                                 pref_defaults.javascript_enabled);
 524   registry->RegisterBooleanPref(prefs::kWebKitWebSecurityEnabled,
 525                                 pref_defaults.web_security_enabled);
 526   registry->RegisterBooleanPref(
 527       prefs::kWebKitJavascriptCanOpenWindowsAutomatically, true);
 528   registry->RegisterBooleanPref(prefs::kWebKitLoadsImagesAutomatically,
 529                                 pref_defaults.loads_images_automatically);
 530   registry->RegisterBooleanPref(prefs::kWebKitPluginsEnabled,
 531                                 pref_defaults.plugins_enabled);
 532   registry->RegisterBooleanPref(prefs::kWebKitDomPasteEnabled,
 533                                 pref_defaults.dom_paste_enabled);
 534   registry->RegisterBooleanPref(prefs::kWebKitTextAreasAreResizable,
 535                                 pref_defaults.text_areas_are_resizable);
 536   registry->RegisterBooleanPref(prefs::kWebkitTabsToLinks,
 537                                 pref_defaults.tabs_to_links);
 538   registry->RegisterBooleanPref(prefs::kWebKitAllowRunningInsecureContent,
 539                                 false);
 540   registry->RegisterBooleanPref(prefs::kWebKitAllowDisplayingInsecureContent,
 541                                 true);
 542   registry->RegisterBooleanPref(prefs::kEnableReferrers, true);
 543 #if defined(OS_ANDROID)
 544   registry->RegisterDoublePref(prefs::kWebKitFontScaleFactor, 1.0);
 545   registry->RegisterBooleanPref(prefs::kWebKitForceEnableZoom,
 546                                 pref_defaults.force_enable_zoom);
 547   registry->RegisterBooleanPref(prefs::kWebKitPasswordEchoEnabled,
 548                                 pref_defaults.password_echo_enabled);
 549 #endif
 550   registry->RegisterStringPref(
 551       prefs::kAcceptLanguages,
 552       l10n_util::GetStringUTF8(IDS_ACCEPT_LANGUAGES),
 553       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 554   registry->RegisterStringPref(
 555       prefs::kDefaultCharset,
 556       l10n_util::GetStringUTF8(IDS_DEFAULT_ENCODING),
 557       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 558
 559   // Register font prefs that have defaults.
 560   std::set<std::string> fonts_with_defaults;
 561   UScriptCode browser_script = GetScriptOfBrowserLocale();
 562   for (size_t i = 0; i < kFontDefaultsLength; ++i) {
 563     FontDefault pref = kFontDefaults[i];
 564
 565 #if defined(OS_WIN)
 566     if (pref.pref_name == prefs::kWebKitFixedFontFamily) {
 567       if (ShouldUseAlternateDefaultFixedFont(
 568               l10n_util::GetStringUTF8(pref.resource_id)))
 569         pref.resource_id = IDS_FIXED_FONT_FAMILY_ALT_WIN;
 570     }
 571 #endif
 572
 573     UScriptCode pref_script = GetScriptOfFontPref(pref.pref_name);
 574
 575     // Suppress this default font pref value if it is for the primary script of
 576     // the browser's UI locale.  For example, if the pref is for the sans-serif
 577     // font for the Cyrillic script, and the browser locale is "ru" (Russian),
 578     // the default is suppressed.  Otherwise, the default would override the
 579     // user's font preferences when viewing pages in their native language.
 580     // This is because users have no way yet of customizing their per-script
 581     // font preferences.  The font prefs accessible in the options UI are for
 582     // the default, unknown script; these prefs have less priority than the
 583     // per-script font prefs when the script of the content is known.  This code
 584     // can possibly be removed later if users can easily access per-script font
 585     // prefs (e.g., via the extensions workflow), or the problem turns out to
 586     // not be really critical after all.
 587     if (browser_script != pref_script) {
 588       registry->RegisterStringPref(pref.pref_name,
 589                                    l10n_util::GetStringUTF8(pref.resource_id));
 590       fonts_with_defaults.insert(pref.pref_name);
 591     }
 592   }
 593
 594   // Register per-script font prefs that don't have defaults.
 595 #if !defined(OS_ANDROID)
 596   RegisterFontFamilyPrefs(registry, fonts_with_defaults);
 597 #endif
 598
 599   RegisterLocalizedFontPref(registry, prefs::kWebKitDefaultFontSize,
 600                             IDS_DEFAULT_FONT_SIZE);
 601   RegisterLocalizedFontPref(registry, prefs::kWebKitDefaultFixedFontSize,
 602                             IDS_DEFAULT_FIXED_FONT_SIZE);
 603   RegisterLocalizedFontPref(registry, prefs::kWebKitMinimumFontSize,
 604                             IDS_MINIMUM_FONT_SIZE);
 605   RegisterLocalizedFontPref(registry, prefs::kWebKitMinimumLogicalFontSize,
 606                             IDS_MINIMUM_LOGICAL_FONT_SIZE);
 607   registry->RegisterBooleanPref(
 608       prefs::kWebKitUsesUniversalDetector,
 609       l10n_util::GetStringUTF8(IDS_USES_UNIVERSAL_DETECTOR) == "true",
 610       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 611   registry->RegisterStringPref(
 612       prefs::kStaticEncodings,
 613       l10n_util::GetStringUTF8(IDS_STATIC_ENCODING_LIST));
 614   registry->RegisterStringPref(prefs::kRecentlySelectedEncoding, std::string());
 615 }
 616
 617 // static
 618 void PrefsTabHelper::GetServiceInstance() {
 619   PrefWatcherFactory::GetInstance();
 620 }
 621
 622 void PrefsTabHelper::Observe(int type,
 623                              const content::NotificationSource& source,
 624                              const content::NotificationDetails& details) {
 625 #if defined(OS_POSIX) && !defined(OS_MACOSX) && defined(ENABLE_THEMES)
 626   if (type == chrome::NOTIFICATION_BROWSER_THEME_CHANGED) {
 627     UpdateRendererPreferences();
 628     return;
 629   }
 630 #endif
 631
 632 #if defined(USE_AURA)
 633   if (type == chrome::NOTIFICATION_BROWSER_FLING_CURVE_PARAMETERS_CHANGED) {
 634     UpdateRendererPreferences();
 635     return;
 636   }
 637 #endif  // defined(USE_AURA)
 638
 639   NOTREACHED();
 640 }
 641
 642 void PrefsTabHelper::UpdateWebPreferences() {
 643   web_contents_->GetRenderViewHost()->UpdateWebkitPreferences(
 644       web_contents_->GetRenderViewHost()->GetWebkitPreferences());
 645 }
 646
 647 void PrefsTabHelper::UpdateRendererPreferences() {
 648   content::RendererPreferences* prefs =
 649       web_contents_->GetMutableRendererPrefs();
 650   renderer_preferences_util::UpdateFromSystemSettings(
 651       prefs, profile_, web_contents_);
 652   web_contents_->GetRenderViewHost()->SyncRendererPrefs();
 653 }
 654 void PrefsTabHelper::OnFontFamilyPrefChanged(const std::string& pref_name) {
 655   // When a font family pref's value goes from non-empty to the empty string, we
 656   // must add it to the usual WebPreferences struct passed to the renderer.
 657   //
 658   // The empty string means to fall back to the pref for the Common script
 659   // ("Zyyy").  For example, if chrome.fonts.serif.Cyrl is the empty string, it
 660   // means to use chrome.fonts.serif.Zyyy for Cyrillic script. Prefs that are
 661   // the empty string are normally not passed to WebKit, since there are so many
 662   // of them that it would cause a performance regression. Not passing the pref
 663   // is normally okay since WebKit does the desired fallback behavior regardless
 664   // of whether the empty string is passed or the pref is not passed at all. But
 665   // if the pref has changed from non-empty to the empty string, we must let
 666   // WebKit know.
 667   std::string generic_family;
 668   std::string script;
 669   if (pref_names_util::ParseFontNamePrefPath(pref_name,
 670                                              &generic_family,
 671                                              &script)) {
 672     PrefService* prefs = profile_->GetPrefs();
 673     std::string pref_value = prefs->GetString(pref_name);
 674     if (pref_value.empty()) {
 675       WebPreferences web_prefs =
 676           web_contents_->GetRenderViewHost()->GetWebkitPreferences();
 677       OverrideFontFamily(&web_prefs, generic_family, script, std::string());
 678       web_contents_->GetRenderViewHost()->UpdateWebkitPreferences(web_prefs);
 679       return;
 680     }
 681   }
 682 }
 683
 684 void PrefsTabHelper::OnWebPrefChanged(const std::string& pref_name) {
 685 #if !defined(OS_ANDROID)
 686   OnFontFamilyPrefChanged(pref_name);
 687 #endif
 688
 689   web_contents_->GetRenderViewHost()->OnWebkitPreferencesChanged();
 690 }