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      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/web_applications/web_app_win.h"
      6 
      7 #include <shlobj.h>
      8 
      9 #include "base/command_line.h"
     10 #include "base/file_util.h"
     11 #include "base/files/file_enumerator.h"
     12 #include "base/logging.h"
     13 #include "base/md5.h"
     14 #include "base/path_service.h"
     15 #include "base/strings/string_piece.h"
     16 #include "base/strings/stringprintf.h"
     17 #include "base/strings/utf_string_conversions.h"
     18 #include "base/win/shortcut.h"
     19 #include "base/win/windows_version.h"
     20 #include "chrome/browser/web_applications/update_shortcut_worker_win.h"
     21 #include "chrome/common/chrome_switches.h"
     22 #include "chrome/installer/util/browser_distribution.h"
     23 #include "chrome/installer/util/shell_util.h"
     24 #include "chrome/installer/util/util_constants.h"
     25 #include "content/public/browser/browser_thread.h"
     26 #include "ui/base/win/shell.h"
     27 #include "ui/gfx/icon_util.h"
     28 #include "ui/gfx/image/image.h"
     29 #include "ui/gfx/image/image_family.h"
     30 
     31 namespace {
     32 
     33 const base::FilePath::CharType kIconChecksumFileExt[] =
     34     FILE_PATH_LITERAL(".ico.md5");
     35 
     36 // Calculates checksum of an icon family using MD5.
     37 // The checksum is derived from all of the icons in the family.
     38 void GetImageCheckSum(const gfx::ImageFamily& image, base::MD5Digest* digest) {
     39   DCHECK(digest);
     40   base::MD5Context md5_context;
     41   base::MD5Init(&md5_context);
     42 
     43   for (gfx::ImageFamily::const_iterator it = image.begin(); it != image.end();
     44        ++it) {
     45     SkBitmap bitmap = it->AsBitmap();
     46 
     47     SkAutoLockPixels image_lock(bitmap);
     48     base::StringPiece image_data(
     49         reinterpret_cast<const char*>(bitmap.getPixels()), bitmap.getSize());
     50     base::MD5Update(&md5_context, image_data);
     51   }
     52 
     53   base::MD5Final(digest, &md5_context);
     54 }
     55 
     56 // Saves |image| as an |icon_file| with the checksum.
     57 bool SaveIconWithCheckSum(const base::FilePath& icon_file,
     58                           const gfx::ImageFamily& image) {
     59   if (!IconUtil::CreateIconFileFromImageFamily(image, icon_file))
     60     return false;
     61 
     62   base::MD5Digest digest;
     63   GetImageCheckSum(image, &digest);
     64 
     65   base::FilePath cheksum_file(icon_file.ReplaceExtension(kIconChecksumFileExt));
     66   return base::WriteFile(cheksum_file,
     67                          reinterpret_cast<const char*>(&digest),
     68                          sizeof(digest)) == sizeof(digest);
     69 }
     70 
     71 // Returns true if |icon_file| is missing or different from |image|.
     72 bool ShouldUpdateIcon(const base::FilePath& icon_file,
     73                       const gfx::ImageFamily& image) {
     74   base::FilePath checksum_file(
     75       icon_file.ReplaceExtension(kIconChecksumFileExt));
     76 
     77   // Returns true if icon_file or checksum file is missing.
     78   if (!base::PathExists(icon_file) ||
     79       !base::PathExists(checksum_file))
     80     return true;
     81 
     82   base::MD5Digest persisted_image_checksum;
     83   if (sizeof(persisted_image_checksum) != base::ReadFile(checksum_file,
     84                       reinterpret_cast<char*>(&persisted_image_checksum),
     85                       sizeof(persisted_image_checksum)))
     86     return true;
     87 
     88   base::MD5Digest downloaded_image_checksum;
     89   GetImageCheckSum(image, &downloaded_image_checksum);
     90 
     91   // Update icon if checksums are not equal.
     92   return memcmp(&persisted_image_checksum, &downloaded_image_checksum,
     93                 sizeof(base::MD5Digest)) != 0;
     94 }
     95 
     96 // Returns true if |shortcut_file_name| matches profile |profile_path|, and has
     97 // an --app-id flag.
     98 bool IsAppShortcutForProfile(const base::FilePath& shortcut_file_name,
     99                              const base::FilePath& profile_path) {
    100   base::string16 cmd_line_string;
    101   if (base::win::ResolveShortcut(shortcut_file_name, NULL, &cmd_line_string)) {
    102     cmd_line_string = L"program " + cmd_line_string;
    103     CommandLine shortcut_cmd_line = CommandLine::FromString(cmd_line_string);
    104     return shortcut_cmd_line.HasSwitch(switches::kProfileDirectory) &&
    105            shortcut_cmd_line.GetSwitchValuePath(switches::kProfileDirectory) ==
    106                profile_path.BaseName() &&
    107            shortcut_cmd_line.HasSwitch(switches::kAppId);
    108   }
    109 
    110   return false;
    111 }
    112 
    113 // Finds shortcuts in |shortcut_path| that match profile for |profile_path| and
    114 // extension with title |shortcut_name|.
    115 // If |shortcut_name| is empty, finds all shortcuts matching |profile_path|.
    116 std::vector<base::FilePath> FindAppShortcutsByProfileAndTitle(
    117     const base::FilePath& shortcut_path,
    118     const base::FilePath& profile_path,
    119     const base::string16& shortcut_name) {
    120   std::vector<base::FilePath> shortcut_paths;
    121 
    122   if (shortcut_name.empty()) {
    123     // Find all shortcuts for this profile.
    124     base::FileEnumerator files(shortcut_path, false,
    125                                base::FileEnumerator::FILES,
    126                                FILE_PATH_LITERAL("*.lnk"));
    127     base::FilePath shortcut_file = files.Next();
    128     while (!shortcut_file.empty()) {
    129       if (IsAppShortcutForProfile(shortcut_file, profile_path))
    130         shortcut_paths.push_back(shortcut_file);
    131       shortcut_file = files.Next();
    132     }
    133   } else {
    134     // Find all shortcuts matching |shortcut_name|.
    135     base::FilePath base_path = shortcut_path.
    136         Append(web_app::internals::GetSanitizedFileName(shortcut_name)).
    137         AddExtension(FILE_PATH_LITERAL(".lnk"));
    138 
    139     const int fileNamesToCheck = 10;
    140     for (int i = 0; i < fileNamesToCheck; ++i) {
    141       base::FilePath shortcut_file = base_path;
    142       if (i > 0) {
    143         shortcut_file = shortcut_file.InsertBeforeExtensionASCII(
    144             base::StringPrintf(" (%d)", i));
    145       }
    146       if (base::PathExists(shortcut_file) &&
    147           IsAppShortcutForProfile(shortcut_file, profile_path)) {
    148         shortcut_paths.push_back(shortcut_file);
    149       }
    150     }
    151   }
    152 
    153   return shortcut_paths;
    154 }
    155 
    156 // Creates application shortcuts in a given set of paths.
    157 // |shortcut_paths| is a list of directories in which shortcuts should be
    158 // created. If |creation_reason| is SHORTCUT_CREATION_AUTOMATED and there is an
    159 // existing shortcut to this app for this profile, does nothing (succeeding).
    160 // Returns true on success, false on failure.
    161 // Must be called on the FILE thread.
    162 bool CreateShortcutsInPaths(
    163     const base::FilePath& web_app_path,
    164     const web_app::ShortcutInfo& shortcut_info,
    165     const std::vector<base::FilePath>& shortcut_paths,
    166     web_app::ShortcutCreationReason creation_reason,
    167     std::vector<base::FilePath>* out_filenames) {
    168   // Ensure web_app_path exists.
    169   if (!base::PathExists(web_app_path) &&
    170       !base::CreateDirectory(web_app_path)) {
    171     return false;
    172   }
    173 
    174   // Generates file name to use with persisted ico and shortcut file.
    175   base::FilePath icon_file =
    176       web_app::internals::GetIconFilePath(web_app_path, shortcut_info.title);
    177   if (!web_app::internals::CheckAndSaveIcon(icon_file, shortcut_info.favicon)) {
    178     return false;
    179   }
    180 
    181   base::FilePath chrome_exe;
    182   if (!PathService::Get(base::FILE_EXE, &chrome_exe)) {
    183     NOTREACHED();
    184     return false;
    185   }
    186 
    187   // Working directory.
    188   base::FilePath working_dir(chrome_exe.DirName());
    189 
    190   CommandLine cmd_line(CommandLine::NO_PROGRAM);
    191   cmd_line = ShellIntegration::CommandLineArgsForLauncher(shortcut_info.url,
    192       shortcut_info.extension_id, shortcut_info.profile_path);
    193 
    194   // TODO(evan): we rely on the fact that command_line_string() is
    195   // properly quoted for a Windows command line.  The method on
    196   // CommandLine should probably be renamed to better reflect that
    197   // fact.
    198   base::string16 wide_switches(cmd_line.GetCommandLineString());
    199 
    200   // Sanitize description
    201   base::string16 description = shortcut_info.description;
    202   if (description.length() >= MAX_PATH)
    203     description.resize(MAX_PATH - 1);
    204 
    205   // Generates app id from web app url and profile path.
    206   std::string app_name(web_app::GenerateApplicationNameFromInfo(shortcut_info));
    207   base::string16 app_id(ShellIntegration::GetAppModelIdForProfile(
    208       base::UTF8ToUTF16(app_name), shortcut_info.profile_path));
    209 
    210   bool success = true;
    211   for (size_t i = 0; i < shortcut_paths.size(); ++i) {
    212     base::FilePath shortcut_file =
    213         shortcut_paths[i]
    214             .Append(
    215                  web_app::internals::GetSanitizedFileName(shortcut_info.title))
    216             .AddExtension(installer::kLnkExt);
    217     if (creation_reason == web_app::SHORTCUT_CREATION_AUTOMATED) {
    218       // Check whether there is an existing shortcut to this app.
    219       std::vector<base::FilePath> shortcut_files =
    220           FindAppShortcutsByProfileAndTitle(shortcut_paths[i],
    221                                             shortcut_info.profile_path,
    222                                             shortcut_info.title);
    223       if (!shortcut_files.empty())
    224         continue;
    225     }
    226     if (shortcut_paths[i] != web_app_path) {
    227       int unique_number =
    228           base::GetUniquePathNumber(shortcut_file,
    229                                     base::FilePath::StringType());
    230       if (unique_number == -1) {
    231         success = false;
    232         continue;
    233       } else if (unique_number > 0) {
    234         shortcut_file = shortcut_file.InsertBeforeExtensionASCII(
    235             base::StringPrintf(" (%d)", unique_number));
    236       }
    237     }
    238     base::win::ShortcutProperties shortcut_properties;
    239     shortcut_properties.set_target(chrome_exe);
    240     shortcut_properties.set_working_dir(working_dir);
    241     shortcut_properties.set_arguments(wide_switches);
    242     shortcut_properties.set_description(description);
    243     shortcut_properties.set_icon(icon_file, 0);
    244     shortcut_properties.set_app_id(app_id);
    245     shortcut_properties.set_dual_mode(false);
    246     if (!base::PathExists(shortcut_file.DirName()) &&
    247         !base::CreateDirectory(shortcut_file.DirName())) {
    248       NOTREACHED();
    249       return false;
    250     }
    251     success = base::win::CreateOrUpdateShortcutLink(
    252         shortcut_file, shortcut_properties,
    253         base::win::SHORTCUT_CREATE_ALWAYS) && success;
    254     if (out_filenames)
    255       out_filenames->push_back(shortcut_file);
    256   }
    257 
    258   return success;
    259 }
    260 
    261 // Gets the directories with shortcuts for an app, and deletes the shortcuts.
    262 // This will search the standard locations for shortcuts named |title| that open
    263 // in the profile with |profile_path|.
    264 // |was_pinned_to_taskbar| will be set to true if there was previously a
    265 // shortcut pinned to the taskbar for this app; false otherwise.
    266 // If |web_app_path| is empty, this will not delete shortcuts from the web app
    267 // directory. If |title| is empty, all shortcuts for this profile will be
    268 // deleted.
    269 // |shortcut_paths| will be populated with a list of directories where shortcuts
    270 // for this app were found (and deleted). This will delete duplicate shortcuts,
    271 // but only return each path once, even if it contained multiple deleted
    272 // shortcuts. Both of these may be NULL.
    273 void GetShortcutLocationsAndDeleteShortcuts(
    274     const base::FilePath& web_app_path,
    275     const base::FilePath& profile_path,
    276     const base::string16& title,
    277     bool* was_pinned_to_taskbar,
    278     std::vector<base::FilePath>* shortcut_paths) {
    279   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE));
    280 
    281   // Get all possible locations for shortcuts.
    282   web_app::ShortcutLocations all_shortcut_locations;
    283   all_shortcut_locations.in_quick_launch_bar = true;
    284   all_shortcut_locations.on_desktop = true;
    285   // Delete shortcuts from the Chrome Apps subdirectory.
    286   // This matches the subdir name set by CreateApplicationShortcutView::Accept
    287   // for Chrome apps (not URL apps, but this function does not apply for them).
    288   all_shortcut_locations.applications_menu_location =
    289       web_app::APP_MENU_LOCATION_SUBDIR_CHROMEAPPS;
    290   std::vector<base::FilePath> all_paths = web_app::internals::GetShortcutPaths(
    291       all_shortcut_locations);
    292   if (base::win::GetVersion() >= base::win::VERSION_WIN7 &&
    293       !web_app_path.empty()) {
    294     all_paths.push_back(web_app_path);
    295   }
    296 
    297   if (was_pinned_to_taskbar) {
    298     // Determine if there is a link to this app in the TaskBar pin directory.
    299     base::FilePath taskbar_pin_path;
    300     if (PathService::Get(base::DIR_TASKBAR_PINS, &taskbar_pin_path)) {
    301       std::vector<base::FilePath> taskbar_pin_files =
    302           FindAppShortcutsByProfileAndTitle(taskbar_pin_path, profile_path,
    303                                             title);
    304       *was_pinned_to_taskbar = !taskbar_pin_files.empty();
    305     } else {
    306       *was_pinned_to_taskbar = false;
    307     }
    308   }
    309 
    310   for (std::vector<base::FilePath>::const_iterator i = all_paths.begin();
    311        i != all_paths.end(); ++i) {
    312     std::vector<base::FilePath> shortcut_files =
    313         FindAppShortcutsByProfileAndTitle(*i, profile_path, title);
    314     if (shortcut_paths && !shortcut_files.empty()) {
    315       shortcut_paths->push_back(*i);
    316     }
    317     for (std::vector<base::FilePath>::const_iterator j = shortcut_files.begin();
    318          j != shortcut_files.end(); ++j) {
    319       // Any shortcut could have been pinned, either by chrome or the user, so
    320       // they are all unpinned.
    321       base::win::TaskbarUnpinShortcutLink(j->value().c_str());
    322       base::DeleteFile(*j, false);
    323     }
    324   }
    325 }
    326 
    327 void CreateIconAndSetRelaunchDetails(const base::FilePath& web_app_path,
    328                                      const base::FilePath& icon_file,
    329                                      const web_app::ShortcutInfo& shortcut_info,
    330                                      HWND hwnd) {
    331   DCHECK(content::BrowserThread::GetBlockingPool()->RunsTasksOnCurrentThread());
    332 
    333   CommandLine command_line =
    334       ShellIntegration::CommandLineArgsForLauncher(shortcut_info.url,
    335                                                    shortcut_info.extension_id,
    336                                                    shortcut_info.profile_path);
    337 
    338   base::FilePath chrome_exe;
    339   if (!PathService::Get(base::FILE_EXE, &chrome_exe)) {
    340     NOTREACHED();
    341     return;
    342   }
    343   command_line.SetProgram(chrome_exe);
    344   ui::win::SetRelaunchDetailsForWindow(
    345       command_line.GetCommandLineString(), shortcut_info.title, hwnd);
    346 
    347   if (!base::PathExists(web_app_path) && !base::CreateDirectory(web_app_path))
    348     return;
    349 
    350   ui::win::SetAppIconForWindow(icon_file.value(), hwnd);
    351   web_app::internals::CheckAndSaveIcon(icon_file, shortcut_info.favicon);
    352 }
    353 
    354 void OnShortcutInfoLoadedForSetRelaunchDetails(
    355     HWND hwnd,
    356     const web_app::ShortcutInfo& shortcut_info) {
    357   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
    358 
    359   // Set window's icon to the one we're about to create/update in the web app
    360   // path. The icon cache will refresh on icon creation.
    361   base::FilePath web_app_path =
    362       web_app::GetWebAppDataDirectory(shortcut_info.profile_path,
    363                                       shortcut_info.extension_id,
    364                                       shortcut_info.url);
    365   base::FilePath icon_file =
    366       web_app_path.Append(web_app::internals::GetSanitizedFileName(
    367                               shortcut_info.title))
    368           .ReplaceExtension(FILE_PATH_LITERAL(".ico"));
    369 
    370   content::BrowserThread::PostBlockingPoolTask(
    371       FROM_HERE,
    372       base::Bind(&CreateIconAndSetRelaunchDetails,
    373                  web_app_path,
    374                  icon_file,
    375                  shortcut_info,
    376                  hwnd));
    377 }
    378 
    379 }  // namespace
    380 
    381 namespace web_app {
    382 
    383 base::FilePath CreateShortcutInWebAppDir(const base::FilePath& web_app_dir,
    384                                          const ShortcutInfo& shortcut_info) {
    385   std::vector<base::FilePath> paths;
    386   paths.push_back(web_app_dir);
    387   std::vector<base::FilePath> out_filenames;
    388   base::FilePath web_app_dir_shortcut =
    389       web_app_dir.Append(internals::GetSanitizedFileName(shortcut_info.title))
    390           .AddExtension(installer::kLnkExt);
    391   if (!PathExists(web_app_dir_shortcut)) {
    392     CreateShortcutsInPaths(web_app_dir,
    393                            shortcut_info,
    394                            paths,
    395                            SHORTCUT_CREATION_BY_USER,
    396                            &out_filenames);
    397     DCHECK_EQ(out_filenames.size(), 1u);
    398     DCHECK_EQ(out_filenames[0].value(), web_app_dir_shortcut.value());
    399   } else {
    400     internals::CheckAndSaveIcon(
    401         internals::GetIconFilePath(web_app_dir, shortcut_info.title),
    402         shortcut_info.favicon);
    403   }
    404   return web_app_dir_shortcut;
    405 }
    406 
    407 void UpdateRelaunchDetailsForApp(Profile* profile,
    408                                  const extensions::Extension* extension,
    409                                  HWND hwnd) {
    410   web_app::UpdateShortcutInfoAndIconForApp(
    411       extension,
    412       profile,
    413       base::Bind(&OnShortcutInfoLoadedForSetRelaunchDetails, hwnd));
    414 }
    415 
    416 void UpdateShortcutsForAllApps(Profile* profile,
    417                                const base::Closure& callback) {
    418   callback.Run();
    419 }
    420 
    421 namespace internals {
    422 
    423 // Saves |image| to |icon_file| if the file is outdated and refresh shell's
    424 // icon cache to ensure correct icon is displayed. Returns true if icon_file
    425 // is up to date or successfully updated.
    426 bool CheckAndSaveIcon(const base::FilePath& icon_file,
    427                       const gfx::ImageFamily& image) {
    428   if (ShouldUpdateIcon(icon_file, image)) {
    429     if (SaveIconWithCheckSum(icon_file, image)) {
    430       // Refresh shell's icon cache. This call is quite disruptive as user would
    431       // see explorer rebuilding the icon cache. It would be great that we find
    432       // a better way to achieve this.
    433       SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_IDLIST | SHCNF_FLUSHNOWAIT,
    434                      NULL, NULL);
    435     } else {
    436       return false;
    437     }
    438   }
    439 
    440   return true;
    441 }
    442 
    443 bool CreatePlatformShortcuts(
    444     const base::FilePath& web_app_path,
    445     const ShortcutInfo& shortcut_info,
    446     const extensions::FileHandlersInfo& file_handlers_info,
    447     const ShortcutLocations& creation_locations,
    448     ShortcutCreationReason creation_reason) {
    449   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE));
    450 
    451   // Nothing to do on Windows for hidden apps.
    452   if (creation_locations.applications_menu_location == APP_MENU_LOCATION_HIDDEN)
    453     return true;
    454 
    455   // Shortcut paths under which to create shortcuts.
    456   std::vector<base::FilePath> shortcut_paths =
    457       GetShortcutPaths(creation_locations);
    458 
    459   bool pin_to_taskbar = creation_locations.in_quick_launch_bar &&
    460                         (base::win::GetVersion() >= base::win::VERSION_WIN7);
    461 
    462   // Create/update the shortcut in the web app path for the "Pin To Taskbar"
    463   // option in Win7. We use the web app path shortcut because we will overwrite
    464   // it rather than appending unique numbers if the shortcut already exists.
    465   // This prevents pinned apps from having unique numbers in their names.
    466   if (pin_to_taskbar)
    467     shortcut_paths.push_back(web_app_path);
    468 
    469   if (shortcut_paths.empty())
    470     return false;
    471 
    472   if (!CreateShortcutsInPaths(web_app_path, shortcut_info, shortcut_paths,
    473                               creation_reason, NULL))
    474     return false;
    475 
    476   if (pin_to_taskbar) {
    477     base::FilePath file_name = GetSanitizedFileName(shortcut_info.title);
    478     // Use the web app path shortcut for pinning to avoid having unique numbers
    479     // in the application name.
    480     base::FilePath shortcut_to_pin = web_app_path.Append(file_name).
    481         AddExtension(installer::kLnkExt);
    482     if (!base::win::TaskbarPinShortcutLink(shortcut_to_pin.value().c_str()))
    483       return false;
    484   }
    485 
    486   return true;
    487 }
    488 
    489 void UpdatePlatformShortcuts(
    490     const base::FilePath& web_app_path,
    491     const base::string16& old_app_title,
    492     const ShortcutInfo& shortcut_info,
    493     const extensions::FileHandlersInfo& file_handlers_info) {
    494   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE));
    495 
    496   // Generates file name to use with persisted ico and shortcut file.
    497   base::FilePath file_name =
    498       web_app::internals::GetSanitizedFileName(shortcut_info.title);
    499 
    500   if (old_app_title != shortcut_info.title) {
    501     // The app's title has changed. Delete all existing app shortcuts and
    502     // recreate them in any locations they already existed (but do not add them
    503     // to locations where they do not currently exist).
    504     bool was_pinned_to_taskbar;
    505     std::vector<base::FilePath> shortcut_paths;
    506     GetShortcutLocationsAndDeleteShortcuts(
    507         web_app_path, shortcut_info.profile_path, old_app_title,
    508         &was_pinned_to_taskbar, &shortcut_paths);
    509     CreateShortcutsInPaths(web_app_path, shortcut_info, shortcut_paths,
    510                            SHORTCUT_CREATION_BY_USER, NULL);
    511     // If the shortcut was pinned to the taskbar,
    512     // GetShortcutLocationsAndDeleteShortcuts will have deleted it. In that
    513     // case, re-pin it.
    514     if (was_pinned_to_taskbar) {
    515       base::FilePath file_name = GetSanitizedFileName(shortcut_info.title);
    516       // Use the web app path shortcut for pinning to avoid having unique
    517       // numbers in the application name.
    518       base::FilePath shortcut_to_pin = web_app_path.Append(file_name).
    519           AddExtension(installer::kLnkExt);
    520       base::win::TaskbarPinShortcutLink(shortcut_to_pin.value().c_str());
    521     }
    522   }
    523 
    524   // Update the icon if necessary.
    525   base::FilePath icon_file = GetIconFilePath(web_app_path, shortcut_info.title);
    526   CheckAndSaveIcon(icon_file, shortcut_info.favicon);
    527 }
    528 
    529 void DeletePlatformShortcuts(const base::FilePath& web_app_path,
    530                              const ShortcutInfo& shortcut_info) {
    531   GetShortcutLocationsAndDeleteShortcuts(
    532       web_app_path, shortcut_info.profile_path, shortcut_info.title, NULL,
    533       NULL);
    534 
    535   // If there are no more shortcuts in the Chrome Apps subdirectory, remove it.
    536   base::FilePath chrome_apps_dir;
    537   if (ShellUtil::GetShortcutPath(
    538           ShellUtil::SHORTCUT_LOCATION_START_MENU_CHROME_APPS_DIR,
    539           BrowserDistribution::GetDistribution(),
    540           ShellUtil::CURRENT_USER,
    541           &chrome_apps_dir)) {
    542     if (base::IsDirectoryEmpty(chrome_apps_dir))
    543       base::DeleteFile(chrome_apps_dir, false);
    544   }
    545 }
    546 
    547 void DeleteAllShortcutsForProfile(const base::FilePath& profile_path) {
    548   GetShortcutLocationsAndDeleteShortcuts(base::FilePath(), profile_path, L"",
    549                                          NULL, NULL);
    550 
    551   // If there are no more shortcuts in the Chrome Apps subdirectory, remove it.
    552   base::FilePath chrome_apps_dir;
    553   if (ShellUtil::GetShortcutPath(
    554           ShellUtil::SHORTCUT_LOCATION_START_MENU_CHROME_APPS_DIR,
    555           BrowserDistribution::GetDistribution(),
    556           ShellUtil::CURRENT_USER,
    557           &chrome_apps_dir)) {
    558     if (base::IsDirectoryEmpty(chrome_apps_dir))
    559       base::DeleteFile(chrome_apps_dir, false);
    560   }
    561 }
    562 
    563 std::vector<base::FilePath> GetShortcutPaths(
    564     const ShortcutLocations& creation_locations) {
    565   // Shortcut paths under which to create shortcuts.
    566   std::vector<base::FilePath> shortcut_paths;
    567   // Locations to add to shortcut_paths.
    568   struct {
    569     bool use_this_location;
    570     ShellUtil::ShortcutLocation location_id;
    571   } locations[] = {
    572     {
    573       creation_locations.on_desktop,
    574       ShellUtil::SHORTCUT_LOCATION_DESKTOP
    575     }, {
    576       creation_locations.applications_menu_location ==
    577           APP_MENU_LOCATION_ROOT,
    578       ShellUtil::SHORTCUT_LOCATION_START_MENU_ROOT
    579     }, {
    580       creation_locations.applications_menu_location ==
    581           APP_MENU_LOCATION_SUBDIR_CHROME,
    582       ShellUtil::SHORTCUT_LOCATION_START_MENU_CHROME_DIR
    583     }, {
    584       creation_locations.applications_menu_location ==
    585           APP_MENU_LOCATION_SUBDIR_CHROMEAPPS,
    586       ShellUtil::SHORTCUT_LOCATION_START_MENU_CHROME_APPS_DIR
    587     }, {
    588       // For Win7+, |in_quick_launch_bar| indicates that we are pinning to
    589       // taskbar. This needs to be handled by callers.
    590       creation_locations.in_quick_launch_bar &&
    591           base::win::GetVersion() < base::win::VERSION_WIN7,
    592       ShellUtil::SHORTCUT_LOCATION_QUICK_LAUNCH
    593     }
    594   };
    595 
    596   BrowserDistribution* dist = BrowserDistribution::GetDistribution();
    597   // Populate shortcut_paths.
    598   for (int i = 0; i < arraysize(locations); ++i) {
    599     if (locations[i].use_this_location) {
    600       base::FilePath path;
    601       if (!ShellUtil::GetShortcutPath(locations[i].location_id,
    602                                       dist,
    603                                       ShellUtil::CURRENT_USER,
    604                                       &path)) {
    605         NOTREACHED();
    606         continue;
    607       }
    608       shortcut_paths.push_back(path);
    609     }
    610   }
    611   return shortcut_paths;
    612 }
    613 
    614 base::FilePath GetIconFilePath(const base::FilePath& web_app_path,
    615                                const base::string16& title) {
    616   return web_app_path.Append(GetSanitizedFileName(title))
    617       .AddExtension(FILE_PATH_LITERAL(".ico"));
    618 }
    619 
    620 }  // namespace internals
    621 
    622 void UpdateShortcutForTabContents(content::WebContents* web_contents) {
    623   // UpdateShortcutWorker will delete itself when it's done.
    624   UpdateShortcutWorker* worker = new UpdateShortcutWorker(web_contents);
    625   worker->Run();
    626 }
    627 
    628 }  // namespace web_app
    629