chrome/common/extensions/command.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/common/extensions/command.h"
   6
   7 #include "base/logging.h"
   8 #include "base/strings/string_number_conversions.h"
   9 #include "base/strings/string_split.h"
  10 #include "base/strings/string_util.h"
  11 #include "base/values.h"
  12 #include "chrome/common/chrome_version_info.h"  // TODO(finnur): Remove.
  13 #include "extensions/common/error_utils.h"
  14 #include "extensions/common/extension.h"
  15 #include "extensions/common/feature_switch.h"
  16 #include "extensions/common/manifest_constants.h"
  17 #include "grit/generated_resources.h"
  18 #include "ui/base/l10n/l10n_util.h"
  19
  20 namespace extensions {
  21
  22 namespace errors = manifest_errors;
  23 namespace keys = manifest_keys;
  24 namespace values = manifest_values;
  25
  26 namespace {
  27
  28 static const char kMissing[] = "Missing";
  29
  30 static const char kCommandKeyNotSupported[] =
  31     "Command key is not supported. Note: Ctrl means Command on Mac";
  32
  33 bool IsNamedCommand(const std::string& command_name) {
  34   return command_name != values::kPageActionCommandEvent &&
  35          command_name != values::kBrowserActionCommandEvent &&
  36          command_name != values::kScriptBadgeCommandEvent;
  37 }
  38
  39 bool DoesRequireModifier(const std::string& accelerator) {
  40   return accelerator != values::kKeyMediaNextTrack &&
  41          accelerator != values::kKeyMediaPlayPause &&
  42          accelerator != values::kKeyMediaPrevTrack &&
  43          accelerator != values::kKeyMediaStop;
  44 }
  45
  46 ui::Accelerator ParseImpl(const std::string& accelerator,
  47                           const std::string& platform_key,
  48                           int index,
  49                           bool should_parse_media_keys,
  50                           base::string16* error) {
  51   error->clear();
  52   if (platform_key != values::kKeybindingPlatformWin &&
  53       platform_key != values::kKeybindingPlatformMac &&
  54       platform_key != values::kKeybindingPlatformChromeOs &&
  55       platform_key != values::kKeybindingPlatformLinux &&
  56       platform_key != values::kKeybindingPlatformDefault) {
  57     *error = ErrorUtils::FormatErrorMessageUTF16(
  58         errors::kInvalidKeyBindingUnknownPlatform,
  59         base::IntToString(index),
  60         platform_key);
  61     return ui::Accelerator();
  62   }
  63
  64   std::vector<std::string> tokens;
  65   base::SplitString(accelerator, '+', &tokens);
  66   if (tokens.size() == 0 ||
  67       (tokens.size() == 1 && DoesRequireModifier(accelerator)) ||
  68       tokens.size() > 3) {
  69     *error = ErrorUtils::FormatErrorMessageUTF16(
  70         errors::kInvalidKeyBinding,
  71         base::IntToString(index),
  72         platform_key,
  73         accelerator);
  74     return ui::Accelerator();
  75   }
  76
  77   // Now, parse it into an accelerator.
  78   int modifiers = ui::EF_NONE;
  79   ui::KeyboardCode key = ui::VKEY_UNKNOWN;
  80   for (size_t i = 0; i < tokens.size(); i++) {
  81     if (tokens[i] == values::kKeyCtrl) {
  82       modifiers |= ui::EF_CONTROL_DOWN;
  83     } else if (tokens[i] == values::kKeyCommand) {
  84       if (platform_key == values::kKeybindingPlatformMac) {
  85         // Either the developer specified Command+foo in the manifest for Mac or
  86         // they specified Ctrl and it got normalized to Command (to get Ctrl on
  87         // Mac the developer has to specify MacCtrl). Therefore we treat this
  88         // as Command.
  89         modifiers |= ui::EF_COMMAND_DOWN;
  90 #if defined(OS_MACOSX)
  91       } else if (platform_key == values::kKeybindingPlatformDefault) {
  92         // If we see "Command+foo" in the Default section it can mean two
  93         // things, depending on the platform:
  94         // The developer specified "Ctrl+foo" for Default and it got normalized
  95         // on Mac to "Command+foo". This is fine. Treat it as Command.
  96         modifiers |= ui::EF_COMMAND_DOWN;
  97 #endif
  98       } else {
  99         // No other platform supports Command.
 100         key = ui::VKEY_UNKNOWN;
 101         break;
 102       }
 103     } else if (tokens[i] == values::kKeyAlt) {
 104       modifiers |= ui::EF_ALT_DOWN;
 105     } else if (tokens[i] == values::kKeyShift) {
 106       modifiers |= ui::EF_SHIFT_DOWN;
 107     } else if (tokens[i].size() == 1 ||  // A-Z, 0-9.
 108                tokens[i] == values::kKeyComma ||
 109                tokens[i] == values::kKeyPeriod ||
 110                tokens[i] == values::kKeyUp ||
 111                tokens[i] == values::kKeyDown ||
 112                tokens[i] == values::kKeyLeft ||
 113                tokens[i] == values::kKeyRight ||
 114                tokens[i] == values::kKeyIns ||
 115                tokens[i] == values::kKeyDel ||
 116                tokens[i] == values::kKeyHome ||
 117                tokens[i] == values::kKeyEnd ||
 118                tokens[i] == values::kKeyPgUp ||
 119                tokens[i] == values::kKeyPgDwn ||
 120                tokens[i] == values::kKeyTab ||
 121                tokens[i] == values::kKeyMediaNextTrack ||
 122                tokens[i] == values::kKeyMediaPlayPause ||
 123                tokens[i] == values::kKeyMediaPrevTrack ||
 124                tokens[i] == values::kKeyMediaStop) {
 125       if (key != ui::VKEY_UNKNOWN) {
 126         // Multiple key assignments.
 127         key = ui::VKEY_UNKNOWN;
 128         break;
 129       }
 130
 131       if (tokens[i] == values::kKeyComma) {
 132         key = ui::VKEY_OEM_COMMA;
 133       } else if (tokens[i] == values::kKeyPeriod) {
 134         key = ui::VKEY_OEM_PERIOD;
 135       } else if (tokens[i] == values::kKeyUp) {
 136         key = ui::VKEY_UP;
 137       } else if (tokens[i] == values::kKeyDown) {
 138         key = ui::VKEY_DOWN;
 139       } else if (tokens[i] == values::kKeyLeft) {
 140         key = ui::VKEY_LEFT;
 141       } else if (tokens[i] == values::kKeyRight) {
 142         key = ui::VKEY_RIGHT;
 143       } else if (tokens[i] == values::kKeyIns) {
 144         key = ui::VKEY_INSERT;
 145       } else if (tokens[i] == values::kKeyDel) {
 146         key = ui::VKEY_DELETE;
 147       } else if (tokens[i] == values::kKeyHome) {
 148         key = ui::VKEY_HOME;
 149       } else if (tokens[i] == values::kKeyEnd) {
 150         key = ui::VKEY_END;
 151       } else if (tokens[i] == values::kKeyPgUp) {
 152         key = ui::VKEY_PRIOR;
 153       } else if (tokens[i] == values::kKeyPgDwn) {
 154         key = ui::VKEY_NEXT;
 155       } else if (tokens[i] == values::kKeyTab) {
 156         key = ui::VKEY_TAB;
 157       } else if (tokens[i] == values::kKeyMediaNextTrack &&
 158                  should_parse_media_keys) {
 159         key = ui::VKEY_MEDIA_NEXT_TRACK;
 160       } else if (tokens[i] == values::kKeyMediaPlayPause &&
 161                  should_parse_media_keys) {
 162         key = ui::VKEY_MEDIA_PLAY_PAUSE;
 163       } else if (tokens[i] == values::kKeyMediaPrevTrack &&
 164                  should_parse_media_keys) {
 165         key = ui::VKEY_MEDIA_PREV_TRACK;
 166       } else if (tokens[i] == values::kKeyMediaStop &&
 167                  should_parse_media_keys) {
 168         key = ui::VKEY_MEDIA_STOP;
 169       } else if (tokens[i].size() == 1 &&
 170                  tokens[i][0] >= 'A' && tokens[i][0] <= 'Z') {
 171         key = static_cast<ui::KeyboardCode>(ui::VKEY_A + (tokens[i][0] - 'A'));
 172       } else if (tokens[i].size() == 1 &&
 173                  tokens[i][0] >= '0' && tokens[i][0] <= '9') {
 174         key = static_cast<ui::KeyboardCode>(ui::VKEY_0 + (tokens[i][0] - '0'));
 175       } else {
 176         key = ui::VKEY_UNKNOWN;
 177         break;
 178       }
 179     } else {
 180       *error = ErrorUtils::FormatErrorMessageUTF16(
 181           errors::kInvalidKeyBinding,
 182           base::IntToString(index),
 183           platform_key,
 184           accelerator);
 185       return ui::Accelerator();
 186     }
 187   }
 188
 189   bool command = (modifiers & ui::EF_COMMAND_DOWN) != 0;
 190   bool ctrl = (modifiers & ui::EF_CONTROL_DOWN) != 0;
 191   bool alt = (modifiers & ui::EF_ALT_DOWN) != 0;
 192   bool shift = (modifiers & ui::EF_SHIFT_DOWN) != 0;
 193
 194   // We support Ctrl+foo, Alt+foo, Ctrl+Shift+foo, Alt+Shift+foo, but not
 195   // Ctrl+Alt+foo and not Shift+foo either. For a more detailed reason why we
 196   // don't support Ctrl+Alt+foo see this article:
 197   // http://blogs.msdn.com/b/oldnewthing/archive/2004/03/29/101121.aspx.
 198   // On Mac Command can also be used in combination with Shift or on its own,
 199   // as a modifier.
 200   if (key == ui::VKEY_UNKNOWN || (ctrl && alt) || (command && alt) ||
 201       (shift && !ctrl && !alt && !command)) {
 202     *error = ErrorUtils::FormatErrorMessageUTF16(
 203         errors::kInvalidKeyBinding,
 204         base::IntToString(index),
 205         platform_key,
 206         accelerator);
 207     return ui::Accelerator();
 208   }
 209
 210   if ((key == ui::VKEY_MEDIA_NEXT_TRACK ||
 211        key == ui::VKEY_MEDIA_PREV_TRACK ||
 212        key == ui::VKEY_MEDIA_PLAY_PAUSE ||
 213        key == ui::VKEY_MEDIA_STOP) &&
 214       (shift || ctrl || alt || command)) {
 215     *error = ErrorUtils::FormatErrorMessageUTF16(
 216         errors::kInvalidKeyBindingMediaKeyWithModifier,
 217         base::IntToString(index),
 218         platform_key,
 219         accelerator);
 220     return ui::Accelerator();
 221   }
 222
 223   return ui::Accelerator(key, modifiers);
 224 }
 225
 226 // For Mac, we convert "Ctrl" to "Command" and "MacCtrl" to "Ctrl". Other
 227 // platforms leave the shortcut untouched.
 228 std::string NormalizeShortcutSuggestion(const std::string& suggestion,
 229                                         const std::string& platform) {
 230   bool normalize = false;
 231   if (platform == values::kKeybindingPlatformMac) {
 232     normalize = true;
 233   } else if (platform == values::kKeybindingPlatformDefault) {
 234 #if defined(OS_MACOSX)
 235     normalize = true;
 236 #endif
 237   }
 238
 239   if (!normalize)
 240     return suggestion;
 241
 242   std::vector<std::string> tokens;
 243   base::SplitString(suggestion, '+', &tokens);
 244   for (size_t i = 0; i < tokens.size(); i++) {
 245     if (tokens[i] == values::kKeyCtrl)
 246       tokens[i] = values::kKeyCommand;
 247     else if (tokens[i] == values::kKeyMacCtrl)
 248       tokens[i] = values::kKeyCtrl;
 249   }
 250   return JoinString(tokens, '+');
 251 }
 252
 253 }  // namespace
 254
 255 Command::Command() : global_(false) {}
 256
 257 Command::Command(const std::string& command_name,
 258                  const base::string16& description,
 259                  const std::string& accelerator,
 260                  bool global)
 261     : command_name_(command_name),
 262       description_(description),
 263       global_(global) {
 264   base::string16 error;
 265   accelerator_ = ParseImpl(accelerator, CommandPlatform(), 0,
 266                            IsNamedCommand(command_name), &error);
 267 }
 268
 269 Command::~Command() {}
 270
 271 // static
 272 std::string Command::CommandPlatform() {
 273 #if defined(OS_WIN)
 274   return values::kKeybindingPlatformWin;
 275 #elif defined(OS_MACOSX)
 276   return values::kKeybindingPlatformMac;
 277 #elif defined(OS_CHROMEOS)
 278   return values::kKeybindingPlatformChromeOs;
 279 #elif defined(OS_LINUX)
 280   return values::kKeybindingPlatformLinux;
 281 #else
 282   return "";
 283 #endif
 284 }
 285
 286 // static
 287 ui::Accelerator Command::StringToAccelerator(const std::string& accelerator,
 288                                              const std::string& command_name) {
 289   base::string16 error;
 290   ui::Accelerator parsed =
 291       ParseImpl(accelerator, Command::CommandPlatform(), 0,
 292                 IsNamedCommand(command_name), &error);
 293   return parsed;
 294 }
 295
 296 // static
 297 std::string Command::AcceleratorToString(const ui::Accelerator& accelerator) {
 298   std::string shortcut;
 299
 300   // Ctrl and Alt are mutually exclusive.
 301   if (accelerator.IsCtrlDown())
 302     shortcut += values::kKeyCtrl;
 303   else if (accelerator.IsAltDown())
 304     shortcut += values::kKeyAlt;
 305   if (!shortcut.empty())
 306     shortcut += values::kKeySeparator;
 307
 308   if (accelerator.IsCmdDown()) {
 309     shortcut += values::kKeyCommand;
 310     shortcut += values::kKeySeparator;
 311   }
 312
 313   if (accelerator.IsShiftDown()) {
 314     shortcut += values::kKeyShift;
 315     shortcut += values::kKeySeparator;
 316   }
 317
 318   if (accelerator.key_code() >= ui::VKEY_0 &&
 319       accelerator.key_code() <= ui::VKEY_9) {
 320     shortcut += '0' + (accelerator.key_code() - ui::VKEY_0);
 321   } else if (accelerator.key_code() >= ui::VKEY_A &&
 322            accelerator.key_code() <= ui::VKEY_Z) {
 323     shortcut += 'A' + (accelerator.key_code() - ui::VKEY_A);
 324   } else {
 325     switch (accelerator.key_code()) {
 326       case ui::VKEY_OEM_COMMA:
 327         shortcut += values::kKeyComma;
 328         break;
 329       case ui::VKEY_OEM_PERIOD:
 330         shortcut += values::kKeyPeriod;
 331         break;
 332       case ui::VKEY_UP:
 333         shortcut += values::kKeyUp;
 334         break;
 335       case ui::VKEY_DOWN:
 336         shortcut += values::kKeyDown;
 337         break;
 338       case ui::VKEY_LEFT:
 339         shortcut += values::kKeyLeft;
 340         break;
 341       case ui::VKEY_RIGHT:
 342         shortcut += values::kKeyRight;
 343         break;
 344       case ui::VKEY_INSERT:
 345         shortcut += values::kKeyIns;
 346         break;
 347       case ui::VKEY_DELETE:
 348         shortcut += values::kKeyDel;
 349         break;
 350       case ui::VKEY_HOME:
 351         shortcut += values::kKeyHome;
 352         break;
 353       case ui::VKEY_END:
 354         shortcut += values::kKeyEnd;
 355         break;
 356       case ui::VKEY_PRIOR:
 357         shortcut += values::kKeyPgUp;
 358         break;
 359       case ui::VKEY_NEXT:
 360         shortcut += values::kKeyPgDwn;
 361         break;
 362       case ui::VKEY_TAB:
 363         shortcut += values::kKeyTab;
 364         break;
 365       case ui::VKEY_MEDIA_NEXT_TRACK:
 366         shortcut += values::kKeyMediaNextTrack;
 367         break;
 368       case ui::VKEY_MEDIA_PLAY_PAUSE:
 369         shortcut += values::kKeyMediaPlayPause;
 370         break;
 371       case ui::VKEY_MEDIA_PREV_TRACK:
 372         shortcut += values::kKeyMediaPrevTrack;
 373         break;
 374       case ui::VKEY_MEDIA_STOP:
 375         shortcut += values::kKeyMediaStop;
 376         break;
 377       default:
 378         return "";
 379     }
 380   }
 381   return shortcut;
 382 }
 383
 384 bool Command::Parse(const base::DictionaryValue* command,
 385                     const std::string& command_name,
 386                     int index,
 387                     base::string16* error) {
 388   DCHECK(!command_name.empty());
 389
 390   base::string16 description;
 391   if (IsNamedCommand(command_name)) {
 392     if (!command->GetString(keys::kDescription, &description) ||
 393         description.empty()) {
 394       *error = ErrorUtils::FormatErrorMessageUTF16(
 395           errors::kInvalidKeyBindingDescription,
 396           base::IntToString(index));
 397       return false;
 398     }
 399   }
 400
 401   // We'll build up a map of platform-to-shortcut suggestions.
 402   typedef std::map<const std::string, std::string> SuggestionMap;
 403   SuggestionMap suggestions;
 404
 405   // First try to parse the |suggested_key| as a dictionary.
 406   const base::DictionaryValue* suggested_key_dict;
 407   if (command->GetDictionary(keys::kSuggestedKey, &suggested_key_dict)) {
 408     for (base::DictionaryValue::Iterator iter(*suggested_key_dict);
 409          !iter.IsAtEnd(); iter.Advance()) {
 410       // For each item in the dictionary, extract the platforms specified.
 411       std::string suggested_key_string;
 412       if (iter.value().GetAsString(&suggested_key_string) &&
 413           !suggested_key_string.empty()) {
 414         // Found a platform, add it to the suggestions list.
 415         suggestions[iter.key()] = suggested_key_string;
 416       } else {
 417         *error = ErrorUtils::FormatErrorMessageUTF16(
 418             errors::kInvalidKeyBinding,
 419             base::IntToString(index),
 420             keys::kSuggestedKey,
 421             kMissing);
 422         return false;
 423       }
 424     }
 425   } else {
 426     // No dictionary was found, fall back to using just a string, so developers
 427     // don't have to specify a dictionary if they just want to use one default
 428     // for all platforms.
 429     std::string suggested_key_string;
 430     if (command->GetString(keys::kSuggestedKey, &suggested_key_string) &&
 431         !suggested_key_string.empty()) {
 432       // If only a single string is provided, it must be default for all.
 433       suggestions[values::kKeybindingPlatformDefault] = suggested_key_string;
 434     } else {
 435       suggestions[values::kKeybindingPlatformDefault] = "";
 436     }
 437   }
 438
 439   // Check if this is a global or a regular shortcut.
 440   bool global = false;
 441   if (FeatureSwitch::global_commands()->IsEnabled() &&
 442       chrome::VersionInfo::GetChannel() <= chrome::VersionInfo::CHANNEL_DEV)
 443     command->GetBoolean(keys::kGlobal, &global);
 444
 445   // Normalize the suggestions.
 446   for (SuggestionMap::iterator iter = suggestions.begin();
 447        iter != suggestions.end(); ++iter) {
 448     // Before we normalize Ctrl to Command we must detect when the developer
 449     // specified Command in the Default section, which will work on Mac after
 450     // normalization but only fail on other platforms when they try it out on
 451     // other platforms, which is not what we want.
 452     if (iter->first == values::kKeybindingPlatformDefault &&
 453         iter->second.find("Command+") != std::string::npos) {
 454       *error = ErrorUtils::FormatErrorMessageUTF16(
 455           errors::kInvalidKeyBinding,
 456           base::IntToString(index),
 457           keys::kSuggestedKey,
 458           kCommandKeyNotSupported);
 459       return false;
 460     }
 461
 462     suggestions[iter->first] = NormalizeShortcutSuggestion(iter->second,
 463                                                            iter->first);
 464   }
 465
 466   std::string platform = CommandPlatform();
 467   std::string key = platform;
 468   if (suggestions.find(key) == suggestions.end())
 469     key = values::kKeybindingPlatformDefault;
 470   if (suggestions.find(key) == suggestions.end()) {
 471     *error = ErrorUtils::FormatErrorMessageUTF16(
 472         errors::kInvalidKeyBindingMissingPlatform,
 473         base::IntToString(index),
 474         keys::kSuggestedKey,
 475         platform);
 476     return false;  // No platform specified and no fallback. Bail.
 477   }
 478
 479   // For developer convenience, we parse all the suggestions (and complain about
 480   // errors for platforms other than the current one) but use only what we need.
 481   std::map<const std::string, std::string>::const_iterator iter =
 482       suggestions.begin();
 483   for ( ; iter != suggestions.end(); ++iter) {
 484     ui::Accelerator accelerator;
 485     if (!iter->second.empty()) {
 486       // Note that we pass iter->first to pretend we are on a platform we're not
 487       // on.
 488       accelerator = ParseImpl(iter->second, iter->first, index,
 489                               IsNamedCommand(command_name), error);
 490       if (accelerator.key_code() == ui::VKEY_UNKNOWN) {
 491         if (error->empty()) {
 492           *error = ErrorUtils::FormatErrorMessageUTF16(
 493               errors::kInvalidKeyBinding,
 494               base::IntToString(index),
 495               iter->first,
 496               iter->second);
 497         }
 498         return false;
 499       }
 500     }
 501
 502     if (iter->first == key) {
 503       // This platform is our platform, so grab this key.
 504       accelerator_ = accelerator;
 505       command_name_ = command_name;
 506       description_ = description;
 507       global_ = global;
 508     }
 509   }
 510   return true;
 511 }
 512
 513 base::DictionaryValue* Command::ToValue(const Extension* extension,
 514                                         bool active) const {
 515   base::DictionaryValue* extension_data = new base::DictionaryValue();
 516
 517   base::string16 command_description;
 518   bool extension_action = false;
 519   if (command_name() == values::kBrowserActionCommandEvent ||
 520       command_name() == values::kPageActionCommandEvent ||
 521       command_name() == values::kScriptBadgeCommandEvent) {
 522     command_description =
 523         l10n_util::GetStringUTF16(IDS_EXTENSION_COMMANDS_GENERIC_ACTIVATE);
 524     extension_action = true;
 525   } else {
 526     command_description = description();
 527   }
 528   extension_data->SetString("description", command_description);
 529   extension_data->SetBoolean("active", active);
 530   extension_data->SetString("keybinding", accelerator().GetShortcutText());
 531   extension_data->SetString("command_name", command_name());
 532   extension_data->SetString("extension_id", extension->id());
 533   extension_data->SetBoolean("global", global());
 534   extension_data->SetBoolean("extension_action", extension_action);
 535
 536   if (FeatureSwitch::global_commands()->IsEnabled()) {
 537     // TODO(finnur): This is to make sure we don't show the config UI beyond
 538     // dev and will be removed when we launch.
 539     static bool stable_or_beta =
 540         chrome::VersionInfo::GetChannel() >= chrome::VersionInfo::CHANNEL_BETA;
 541     extension_data->SetBoolean("scope_ui_visible", !stable_or_beta);
 542   }
 543
 544   return extension_data;
 545 }
 546
 547 }  // namespace extensions