chrome/browser/shell_integration_linux.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/shell_integration_linux.h"
   6
   7 #include <fcntl.h>
   8
   9 #if defined(USE_GLIB)
  10 #include <glib.h>
  11 #endif
  12
  13 #include <stdlib.h>
  14 #include <sys/stat.h>
  15 #include <sys/types.h>
  16 #include <unistd.h>
  17
  18 #include <string>
  19 #include <vector>
  20
  21 #include "base/base_paths.h"
  22 #include "base/command_line.h"
  23 #include "base/environment.h"
  24 #include "base/files/file_enumerator.h"
  25 #include "base/files/file_path.h"
  26 #include "base/files/file_util.h"
  27 #include "base/files/scoped_temp_dir.h"
  28 #include "base/i18n/file_util_icu.h"
  29 #include "base/memory/ref_counted_memory.h"
  30 #include "base/memory/scoped_ptr.h"
  31 #include "base/message_loop/message_loop.h"
  32 #include "base/path_service.h"
  33 #include "base/posix/eintr_wrapper.h"
  34 #include "base/process/kill.h"
  35 #include "base/process/launch.h"
  36 #include "base/strings/string_number_conversions.h"
  37 #include "base/strings/string_tokenizer.h"
  38 #include "base/strings/string_util.h"
  39 #include "base/strings/utf_string_conversions.h"
  40 #include "base/threading/thread.h"
  41 #include "base/threading/thread_restrictions.h"
  42 #include "build/build_config.h"
  43 #include "chrome/browser/shell_integration.h"
  44 #include "chrome/common/chrome_constants.h"
  45 #include "chrome/common/chrome_switches.h"
  46 #include "chrome/common/chrome_version_info.h"
  47 #include "content/public/browser/browser_thread.h"
  48 #include "grit/chrome_unscaled_resources.h"
  49 #include "ui/base/resource/resource_bundle.h"
  50 #include "ui/gfx/image/image_family.h"
  51 #include "url/gurl.h"
  52
  53 using content::BrowserThread;
  54
  55 namespace {
  56
  57 // The Categories for the App Launcher desktop shortcut. Should be the same as
  58 // the Chrome desktop shortcut, so they are in the same sub-menu.
  59 const char kAppListCategories[] = "Network;WebBrowser;";
  60
  61 // Helper to launch xdg scripts. We don't want them to ask any questions on the
  62 // terminal etc. The function returns true if the utility launches and exits
  63 // cleanly, in which case |exit_code| returns the utility's exit code.
  64 bool LaunchXdgUtility(const std::vector<std::string>& argv, int* exit_code) {
  65   // xdg-settings internally runs xdg-mime, which uses mv to move newly-created
  66   // files on top of originals after making changes to them. In the event that
  67   // the original files are owned by another user (e.g. root, which can happen
  68   // if they are updated within sudo), mv will prompt the user to confirm if
  69   // standard input is a terminal (otherwise it just does it). So make sure it's
  70   // not, to avoid locking everything up waiting for mv.
  71   *exit_code = EXIT_FAILURE;
  72   int devnull = open("/dev/null", O_RDONLY);
  73   if (devnull < 0)
  74     return false;
  75   base::FileHandleMappingVector no_stdin;
  76   no_stdin.push_back(std::make_pair(devnull, STDIN_FILENO));
  77
  78   base::ProcessHandle handle;
  79   base::LaunchOptions options;
  80   options.fds_to_remap = &no_stdin;
  81   if (!base::LaunchProcess(argv, options, &handle)) {
  82     close(devnull);
  83     return false;
  84   }
  85   close(devnull);
  86
  87   return base::WaitForExitCode(handle, exit_code);
  88 }
  89
  90 std::string CreateShortcutIcon(const gfx::ImageFamily& icon_images,
  91                                const base::FilePath& shortcut_filename) {
  92   if (icon_images.empty())
  93     return std::string();
  94
  95   // TODO(phajdan.jr): Report errors from this function, possibly as infobars.
  96   base::ScopedTempDir temp_dir;
  97   if (!temp_dir.CreateUniqueTempDir())
  98     return std::string();
  99
 100   base::FilePath temp_file_path = temp_dir.path().Append(
 101       shortcut_filename.ReplaceExtension("png"));
 102   std::string icon_name = temp_file_path.BaseName().RemoveExtension().value();
 103
 104   for (gfx::ImageFamily::const_iterator it = icon_images.begin();
 105        it != icon_images.end(); ++it) {
 106     int width = it->Width();
 107     scoped_refptr<base::RefCountedMemory> png_data = it->As1xPNGBytes();
 108     if (png_data->size() == 0) {
 109       // If the bitmap could not be encoded to PNG format, skip it.
 110       LOG(WARNING) << "Could not encode icon " << icon_name << ".png at size "
 111                    << width << ".";
 112       continue;
 113     }
 114     int bytes_written = base::WriteFile(temp_file_path,
 115                                         png_data->front_as<char>(),
 116                                         png_data->size());
 117
 118     if (bytes_written != static_cast<int>(png_data->size()))
 119       return std::string();
 120
 121     std::vector<std::string> argv;
 122     argv.push_back("xdg-icon-resource");
 123     argv.push_back("install");
 124
 125     // Always install in user mode, even if someone runs the browser as root
 126     // (people do that).
 127     argv.push_back("--mode");
 128     argv.push_back("user");
 129
 130     argv.push_back("--size");
 131     argv.push_back(base::IntToString(width));
 132
 133     argv.push_back(temp_file_path.value());
 134     argv.push_back(icon_name);
 135     int exit_code;
 136     if (!LaunchXdgUtility(argv, &exit_code) || exit_code) {
 137       LOG(WARNING) << "Could not install icon " << icon_name << ".png at size "
 138                    << width << ".";
 139     }
 140   }
 141   return icon_name;
 142 }
 143
 144 bool CreateShortcutOnDesktop(const base::FilePath& shortcut_filename,
 145                              const std::string& contents) {
 146   // Make sure that we will later call openat in a secure way.
 147   DCHECK_EQ(shortcut_filename.BaseName().value(), shortcut_filename.value());
 148
 149   base::FilePath desktop_path;
 150   if (!PathService::Get(base::DIR_USER_DESKTOP, &desktop_path))
 151     return false;
 152
 153   int desktop_fd = open(desktop_path.value().c_str(), O_RDONLY | O_DIRECTORY);
 154   if (desktop_fd < 0)
 155     return false;
 156
 157   int fd = openat(desktop_fd, shortcut_filename.value().c_str(),
 158                   O_CREAT | O_EXCL | O_WRONLY,
 159                   S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
 160   if (fd < 0) {
 161     if (IGNORE_EINTR(close(desktop_fd)) < 0)
 162       PLOG(ERROR) << "close";
 163     return false;
 164   }
 165
 166   ssize_t bytes_written = base::WriteFileDescriptor(fd, contents.data(),
 167                                                     contents.length());
 168   if (IGNORE_EINTR(close(fd)) < 0)
 169     PLOG(ERROR) << "close";
 170
 171   if (bytes_written != static_cast<ssize_t>(contents.length())) {
 172     // Delete the file. No shortuct is better than corrupted one. Use unlinkat
 173     // to make sure we're deleting the file in the directory we think we are.
 174     // Even if an attacker manager to put something other at
 175     // |shortcut_filename| we'll just undo his action.
 176     unlinkat(desktop_fd, shortcut_filename.value().c_str(), 0);
 177   }
 178
 179   if (IGNORE_EINTR(close(desktop_fd)) < 0)
 180     PLOG(ERROR) << "close";
 181
 182   return true;
 183 }
 184
 185 void DeleteShortcutOnDesktop(const base::FilePath& shortcut_filename) {
 186   base::FilePath desktop_path;
 187   if (PathService::Get(base::DIR_USER_DESKTOP, &desktop_path))
 188     base::DeleteFile(desktop_path.Append(shortcut_filename), false);
 189 }
 190
 191 // Creates a shortcut with |shortcut_filename| and |contents| in the system
 192 // applications menu. If |directory_filename| is non-empty, creates a sub-menu
 193 // with |directory_filename| and |directory_contents|, and stores the shortcut
 194 // under the sub-menu.
 195 bool CreateShortcutInApplicationsMenu(const base::FilePath& shortcut_filename,
 196                                       const std::string& contents,
 197                                       const base::FilePath& directory_filename,
 198                                       const std::string& directory_contents) {
 199   base::ScopedTempDir temp_dir;
 200   if (!temp_dir.CreateUniqueTempDir())
 201     return false;
 202
 203   base::FilePath temp_directory_path;
 204   if (!directory_filename.empty()) {
 205     temp_directory_path = temp_dir.path().Append(directory_filename);
 206
 207     int bytes_written = base::WriteFile(temp_directory_path,
 208                                         directory_contents.data(),
 209                                         directory_contents.length());
 210
 211     if (bytes_written != static_cast<int>(directory_contents.length()))
 212       return false;
 213   }
 214
 215   base::FilePath temp_file_path = temp_dir.path().Append(shortcut_filename);
 216
 217   int bytes_written = base::WriteFile(temp_file_path, contents.data(),
 218                                       contents.length());
 219
 220   if (bytes_written != static_cast<int>(contents.length()))
 221     return false;
 222
 223   std::vector<std::string> argv;
 224   argv.push_back("xdg-desktop-menu");
 225   argv.push_back("install");
 226
 227   // Always install in user mode, even if someone runs the browser as root
 228   // (people do that).
 229   argv.push_back("--mode");
 230   argv.push_back("user");
 231
 232   // If provided, install the shortcut file inside the given directory.
 233   if (!directory_filename.empty())
 234     argv.push_back(temp_directory_path.value());
 235   argv.push_back(temp_file_path.value());
 236   int exit_code;
 237   LaunchXdgUtility(argv, &exit_code);
 238   return exit_code == 0;
 239 }
 240
 241 void DeleteShortcutInApplicationsMenu(
 242     const base::FilePath& shortcut_filename,
 243     const base::FilePath& directory_filename) {
 244   std::vector<std::string> argv;
 245   argv.push_back("xdg-desktop-menu");
 246   argv.push_back("uninstall");
 247
 248   // Uninstall in user mode, to match the install.
 249   argv.push_back("--mode");
 250   argv.push_back("user");
 251
 252   // The file does not need to exist anywhere - xdg-desktop-menu will uninstall
 253   // items from the menu with a matching name.
 254   // If |directory_filename| is supplied, this will also remove the item from
 255   // the directory, and remove the directory if it is empty.
 256   if (!directory_filename.empty())
 257     argv.push_back(directory_filename.value());
 258   argv.push_back(shortcut_filename.value());
 259   int exit_code;
 260   LaunchXdgUtility(argv, &exit_code);
 261 }
 262
 263 #if defined(USE_GLIB)
 264 // Quote a string such that it appears as one verbatim argument for the Exec
 265 // key in a desktop file.
 266 std::string QuoteArgForDesktopFileExec(const std::string& arg) {
 267   // http://standards.freedesktop.org/desktop-entry-spec/latest/ar01s06.html
 268
 269   // Quoting is only necessary if the argument has a reserved character.
 270   if (arg.find_first_of(" \t\n\"'\\><~|&;$*?#()`") == std::string::npos)
 271     return arg;  // No quoting necessary.
 272
 273   std::string quoted = "\"";
 274   for (size_t i = 0; i < arg.size(); ++i) {
 275     // Note that the set of backslashed characters is smaller than the
 276     // set of reserved characters.
 277     switch (arg[i]) {
 278       case '"':
 279       case '`':
 280       case '$':
 281       case '\\':
 282         quoted += '\\';
 283         break;
 284     }
 285     quoted += arg[i];
 286   }
 287   quoted += '"';
 288
 289   return quoted;
 290 }
 291
 292 // Quote a command line so it is suitable for use as the Exec key in a desktop
 293 // file. Note: This should be used instead of GetCommandLineString, which does
 294 // not properly quote the string; this function is designed for the Exec key.
 295 std::string QuoteCommandLineForDesktopFileExec(
 296     const CommandLine& command_line) {
 297   // http://standards.freedesktop.org/desktop-entry-spec/latest/ar01s06.html
 298
 299   std::string quoted_path = "";
 300   const CommandLine::StringVector& argv = command_line.argv();
 301   for (CommandLine::StringVector::const_iterator i = argv.begin();
 302        i != argv.end(); ++i) {
 303     if (i != argv.begin())
 304       quoted_path += " ";
 305     quoted_path += QuoteArgForDesktopFileExec(*i);
 306   }
 307
 308   return quoted_path;
 309 }
 310
 311 const char kDesktopEntry[] = "Desktop Entry";
 312
 313 const char kXdgOpenShebang[] = "#!/usr/bin/env xdg-open";
 314 #endif
 315
 316 const char kXdgSettings[] = "xdg-settings";
 317 const char kXdgSettingsDefaultBrowser[] = "default-web-browser";
 318 const char kXdgSettingsDefaultSchemeHandler[] = "default-url-scheme-handler";
 319
 320 const char kDirectoryFilename[] = "chrome-apps.directory";
 321
 322 #if defined(GOOGLE_CHROME_BUILD)
 323 const char kAppListDesktopName[] = "chrome-app-list";
 324 #else  // CHROMIUM_BUILD
 325 const char kAppListDesktopName[] = "chromium-app-list";
 326 #endif
 327
 328 // Utility function to get the path to the version of a script shipped with
 329 // Chrome. |script| gives the name of the script. |chrome_version| returns the
 330 // path to the Chrome version of the script, and the return value of the
 331 // function is true if the function is successful and the Chrome version is
 332 // not the script found on the PATH.
 333 bool GetChromeVersionOfScript(const std::string& script,
 334                               std::string* chrome_version) {
 335   // Get the path to the Chrome version.
 336   base::FilePath chrome_dir;
 337   if (!PathService::Get(base::DIR_EXE, &chrome_dir))
 338     return false;
 339
 340   base::FilePath chrome_version_path = chrome_dir.Append(script);
 341   *chrome_version = chrome_version_path.value();
 342
 343   // Check if this is different to the one on path.
 344   std::vector<std::string> argv;
 345   argv.push_back("which");
 346   argv.push_back(script);
 347   std::string path_version;
 348   if (base::GetAppOutput(CommandLine(argv), &path_version)) {
 349     // Remove trailing newline
 350     path_version.erase(path_version.length() - 1, 1);
 351     base::FilePath path_version_path(path_version);
 352     return (chrome_version_path != path_version_path);
 353   }
 354   return false;
 355 }
 356
 357 // Value returned by xdg-settings if it can't understand our request.
 358 const int EXIT_XDG_SETTINGS_SYNTAX_ERROR = 1;
 359
 360 // We delegate the difficulty of setting the default browser and default url
 361 // scheme handler in Linux desktop environments to an xdg utility, xdg-settings.
 362
 363 // When calling this script we first try to use the script on PATH. If that
 364 // fails we then try to use the script that we have included. This gives
 365 // scripts on the system priority over ours, as distribution vendors may have
 366 // tweaked the script, but still allows our copy to be used if the script on the
 367 // system fails, as the system copy may be missing capabilities of the Chrome
 368 // copy.
 369
 370 // If |protocol| is empty this function sets Chrome as the default browser,
 371 // otherwise it sets Chrome as the default handler application for |protocol|.
 372 bool SetDefaultWebClient(const std::string& protocol) {
 373 #if defined(OS_CHROMEOS)
 374   return true;
 375 #else
 376   scoped_ptr<base::Environment> env(base::Environment::Create());
 377
 378   std::vector<std::string> argv;
 379   argv.push_back(kXdgSettings);
 380   argv.push_back("set");
 381   if (protocol.empty()) {
 382     argv.push_back(kXdgSettingsDefaultBrowser);
 383   } else {
 384     argv.push_back(kXdgSettingsDefaultSchemeHandler);
 385     argv.push_back(protocol);
 386   }
 387   argv.push_back(shell_integration_linux::GetDesktopName(env.get()));
 388
 389   int exit_code;
 390   bool ran_ok = LaunchXdgUtility(argv, &exit_code);
 391   if (ran_ok && exit_code == EXIT_XDG_SETTINGS_SYNTAX_ERROR) {
 392     if (GetChromeVersionOfScript(kXdgSettings, &argv[0])) {
 393       ran_ok = LaunchXdgUtility(argv, &exit_code);
 394     }
 395   }
 396
 397   return ran_ok && exit_code == EXIT_SUCCESS;
 398 #endif
 399 }
 400
 401 // If |protocol| is empty this function checks if Chrome is the default browser,
 402 // otherwise it checks if Chrome is the default handler application for
 403 // |protocol|.
 404 ShellIntegration::DefaultWebClientState GetIsDefaultWebClient(
 405     const std::string& protocol) {
 406 #if defined(OS_CHROMEOS)
 407   return ShellIntegration::UNKNOWN_DEFAULT;
 408 #else
 409   base::ThreadRestrictions::AssertIOAllowed();
 410
 411   scoped_ptr<base::Environment> env(base::Environment::Create());
 412
 413   std::vector<std::string> argv;
 414   argv.push_back(kXdgSettings);
 415   argv.push_back("check");
 416   if (protocol.empty()) {
 417     argv.push_back(kXdgSettingsDefaultBrowser);
 418   } else {
 419     argv.push_back(kXdgSettingsDefaultSchemeHandler);
 420     argv.push_back(protocol);
 421   }
 422   argv.push_back(shell_integration_linux::GetDesktopName(env.get()));
 423
 424   std::string reply;
 425   int success_code;
 426   bool ran_ok = base::GetAppOutputWithExitCode(CommandLine(argv), &reply,
 427                                                &success_code);
 428   if (ran_ok && success_code == EXIT_XDG_SETTINGS_SYNTAX_ERROR) {
 429     if (GetChromeVersionOfScript(kXdgSettings, &argv[0])) {
 430       ran_ok = base::GetAppOutputWithExitCode(CommandLine(argv), &reply,
 431                                               &success_code);
 432     }
 433   }
 434
 435   if (!ran_ok || success_code != EXIT_SUCCESS) {
 436     // xdg-settings failed: we can't determine or set the default browser.
 437     return ShellIntegration::UNKNOWN_DEFAULT;
 438   }
 439
 440   // Allow any reply that starts with "yes".
 441   return (reply.find("yes") == 0) ? ShellIntegration::IS_DEFAULT :
 442                                     ShellIntegration::NOT_DEFAULT;
 443 #endif
 444 }
 445
 446 // Get the value of NoDisplay from the [Desktop Entry] section of a .desktop
 447 // file, given in |shortcut_contents|. If the key is not found, returns false.
 448 bool GetNoDisplayFromDesktopFile(const std::string& shortcut_contents) {
 449 #if defined(USE_GLIB)
 450   // An empty file causes a crash with glib <= 2.32, so special case here.
 451   if (shortcut_contents.empty())
 452     return false;
 453
 454   GKeyFile* key_file = g_key_file_new();
 455   GError* err = NULL;
 456   if (!g_key_file_load_from_data(key_file, shortcut_contents.c_str(),
 457                                  shortcut_contents.size(), G_KEY_FILE_NONE,
 458                                  &err)) {
 459     LOG(WARNING) << "Unable to read desktop file template: " << err->message;
 460     g_error_free(err);
 461     g_key_file_free(key_file);
 462     return false;
 463   }
 464
 465   bool nodisplay = false;
 466   char* nodisplay_c_string = g_key_file_get_string(key_file, kDesktopEntry,
 467                                                    "NoDisplay", &err);
 468   if (nodisplay_c_string) {
 469     if (!g_strcmp0(nodisplay_c_string, "true"))
 470       nodisplay = true;
 471     g_free(nodisplay_c_string);
 472   } else {
 473     g_error_free(err);
 474   }
 475
 476   g_key_file_free(key_file);
 477   return nodisplay;
 478 #else
 479   NOTIMPLEMENTED();
 480   return false;
 481 #endif
 482 }
 483
 484 // Gets the path to the Chrome executable or wrapper script.
 485 // Returns an empty path if the executable path could not be found.
 486 base::FilePath GetChromeExePath() {
 487   // Try to get the name of the wrapper script that launched Chrome.
 488   scoped_ptr<base::Environment> environment(base::Environment::Create());
 489   std::string wrapper_script;
 490   if (environment->GetVar("CHROME_WRAPPER", &wrapper_script)) {
 491     return base::FilePath(wrapper_script);
 492   }
 493
 494   // Just return the name of the executable path for Chrome.
 495   base::FilePath chrome_exe_path;
 496   PathService::Get(base::FILE_EXE, &chrome_exe_path);
 497   return chrome_exe_path;
 498 }
 499
 500 }  // namespace
 501
 502 // static
 503 ShellIntegration::DefaultWebClientSetPermission
 504 ShellIntegration::CanSetAsDefaultBrowser() {
 505   return SET_DEFAULT_UNATTENDED;
 506 }
 507
 508 // static
 509 bool ShellIntegration::SetAsDefaultBrowser() {
 510   return SetDefaultWebClient(std::string());
 511 }
 512
 513 // static
 514 bool ShellIntegration::SetAsDefaultProtocolClient(
 515     const std::string& protocol) {
 516   return SetDefaultWebClient(protocol);
 517 }
 518
 519 // static
 520 ShellIntegration::DefaultWebClientState
 521 ShellIntegration::GetDefaultBrowser() {
 522   return GetIsDefaultWebClient(std::string());
 523 }
 524
 525 // static
 526 base::string16 ShellIntegration::GetApplicationNameForProtocol(
 527     const GURL& url) {
 528   return base::ASCIIToUTF16("xdg-open");
 529 }
 530
 531 // static
 532 ShellIntegration::DefaultWebClientState
 533 ShellIntegration::IsDefaultProtocolClient(const std::string& protocol) {
 534   return GetIsDefaultWebClient(protocol);
 535 }
 536
 537 // static
 538 bool ShellIntegration::IsFirefoxDefaultBrowser() {
 539   std::vector<std::string> argv;
 540   argv.push_back(kXdgSettings);
 541   argv.push_back("get");
 542   argv.push_back(kXdgSettingsDefaultBrowser);
 543
 544   std::string browser;
 545   // We don't care about the return value here.
 546   base::GetAppOutput(CommandLine(argv), &browser);
 547   return browser.find("irefox") != std::string::npos;
 548 }
 549
 550 namespace shell_integration_linux {
 551
 552 bool GetDataWriteLocation(base::Environment* env, base::FilePath* search_path) {
 553   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 554
 555   std::string xdg_data_home;
 556   std::string home;
 557   if (env->GetVar("XDG_DATA_HOME", &xdg_data_home) && !xdg_data_home.empty()) {
 558     *search_path = base::FilePath(xdg_data_home);
 559     return true;
 560   } else if (env->GetVar("HOME", &home) && !home.empty()) {
 561     *search_path = base::FilePath(home).Append(".local").Append("share");
 562     return true;
 563   }
 564   return false;
 565 }
 566
 567 std::vector<base::FilePath> GetDataSearchLocations(base::Environment* env) {
 568   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 569
 570   std::vector<base::FilePath> search_paths;
 571
 572   base::FilePath write_location;
 573   if (GetDataWriteLocation(env, &write_location))
 574     search_paths.push_back(write_location);
 575
 576   std::string xdg_data_dirs;
 577   if (env->GetVar("XDG_DATA_DIRS", &xdg_data_dirs) && !xdg_data_dirs.empty()) {
 578     base::StringTokenizer tokenizer(xdg_data_dirs, ":");
 579     while (tokenizer.GetNext()) {
 580       base::FilePath data_dir(tokenizer.token());
 581       search_paths.push_back(data_dir);
 582     }
 583   } else {
 584     search_paths.push_back(base::FilePath("/usr/local/share"));
 585     search_paths.push_back(base::FilePath("/usr/share"));
 586   }
 587
 588   return search_paths;
 589 }
 590
 591 std::string GetProgramClassName() {
 592   DCHECK(CommandLine::InitializedForCurrentProcess());
 593   // Get the res_name component from argv[0].
 594   const CommandLine* command_line = CommandLine::ForCurrentProcess();
 595   std::string class_name = command_line->GetProgram().BaseName().value();
 596   if (!class_name.empty())
 597     class_name[0] = base::ToUpperASCII(class_name[0]);
 598   return class_name;
 599 }
 600
 601 std::string GetDesktopName(base::Environment* env) {
 602 #if defined(GOOGLE_CHROME_BUILD)
 603   chrome::VersionInfo::Channel product_channel(
 604       chrome::VersionInfo::GetChannel());
 605   switch (product_channel) {
 606     case chrome::VersionInfo::CHANNEL_DEV:
 607       return "google-chrome-unstable.desktop";
 608     case chrome::VersionInfo::CHANNEL_BETA:
 609       return "google-chrome-beta.desktop";
 610     default:
 611       return "google-chrome.desktop";
 612   }
 613 #else  // CHROMIUM_BUILD
 614   // Allow $CHROME_DESKTOP to override the built-in value, so that development
 615   // versions can set themselves as the default without interfering with
 616   // non-official, packaged versions using the built-in value.
 617   std::string name;
 618   if (env->GetVar("CHROME_DESKTOP", &name) && !name.empty())
 619     return name;
 620   return "chromium-browser.desktop";
 621 #endif
 622 }
 623
 624 std::string GetIconName() {
 625 #if defined(GOOGLE_CHROME_BUILD)
 626   return "google-chrome";
 627 #else  // CHROMIUM_BUILD
 628   return "chromium-browser";
 629 #endif
 630 }
 631
 632 web_app::ShortcutLocations GetExistingShortcutLocations(
 633     base::Environment* env,
 634     const base::FilePath& profile_path,
 635     const std::string& extension_id) {
 636   base::FilePath desktop_path;
 637   // If Get returns false, just leave desktop_path empty.
 638   PathService::Get(base::DIR_USER_DESKTOP, &desktop_path);
 639   return GetExistingShortcutLocations(env, profile_path, extension_id,
 640                                       desktop_path);
 641 }
 642
 643 web_app::ShortcutLocations GetExistingShortcutLocations(
 644     base::Environment* env,
 645     const base::FilePath& profile_path,
 646     const std::string& extension_id,
 647     const base::FilePath& desktop_path) {
 648   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 649
 650   base::FilePath shortcut_filename = GetExtensionShortcutFilename(
 651       profile_path, extension_id);
 652   DCHECK(!shortcut_filename.empty());
 653   web_app::ShortcutLocations locations;
 654
 655   // Determine whether there is a shortcut on desktop.
 656   if (!desktop_path.empty()) {
 657     locations.on_desktop =
 658         base::PathExists(desktop_path.Append(shortcut_filename));
 659   }
 660
 661   // Determine whether there is a shortcut in the applications directory.
 662   std::string shortcut_contents;
 663   if (GetExistingShortcutContents(env, shortcut_filename, &shortcut_contents)) {
 664     // If the shortcut contents contain NoDisplay=true, it should be hidden.
 665     // Otherwise since these shortcuts are for apps, they are always in the
 666     // "Chrome Apps" directory.
 667     locations.applications_menu_location =
 668         GetNoDisplayFromDesktopFile(shortcut_contents)
 669             ? web_app::APP_MENU_LOCATION_HIDDEN
 670             : web_app::APP_MENU_LOCATION_SUBDIR_CHROMEAPPS;
 671   }
 672
 673   return locations;
 674 }
 675
 676 bool GetExistingShortcutContents(base::Environment* env,
 677                                  const base::FilePath& desktop_filename,
 678                                  std::string* output) {
 679   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 680
 681   std::vector<base::FilePath> search_paths = GetDataSearchLocations(env);
 682
 683   for (std::vector<base::FilePath>::const_iterator i = search_paths.begin();
 684        i != search_paths.end(); ++i) {
 685     base::FilePath path = i->Append("applications").Append(desktop_filename);
 686     VLOG(1) << "Looking for desktop file in " << path.value();
 687     if (base::PathExists(path)) {
 688       VLOG(1) << "Found desktop file at " << path.value();
 689       return base::ReadFileToString(path, output);
 690     }
 691   }
 692
 693   return false;
 694 }
 695
 696 base::FilePath GetWebShortcutFilename(const GURL& url) {
 697   // Use a prefix, because xdg-desktop-menu requires it.
 698   std::string filename =
 699       std::string(chrome::kBrowserProcessExecutableName) + "-" + url.spec();
 700   base::i18n::ReplaceIllegalCharactersInPath(&filename, '_');
 701
 702   base::FilePath desktop_path;
 703   if (!PathService::Get(base::DIR_USER_DESKTOP, &desktop_path))
 704     return base::FilePath();
 705
 706   base::FilePath filepath = desktop_path.Append(filename);
 707   base::FilePath alternative_filepath(filepath.value() + ".desktop");
 708   for (size_t i = 1; i < 100; ++i) {
 709     if (base::PathExists(base::FilePath(alternative_filepath))) {
 710       alternative_filepath = base::FilePath(
 711           filepath.value() + "_" + base::IntToString(i) + ".desktop");
 712     } else {
 713       return base::FilePath(alternative_filepath).BaseName();
 714     }
 715   }
 716
 717   return base::FilePath();
 718 }
 719
 720 base::FilePath GetExtensionShortcutFilename(const base::FilePath& profile_path,
 721                                             const std::string& extension_id) {
 722   DCHECK(!extension_id.empty());
 723
 724   // Use a prefix, because xdg-desktop-menu requires it.
 725   std::string filename(chrome::kBrowserProcessExecutableName);
 726   filename.append("-")
 727       .append(extension_id)
 728       .append("-")
 729       .append(profile_path.BaseName().value());
 730   base::i18n::ReplaceIllegalCharactersInPath(&filename, '_');
 731   // Spaces in filenames break xdg-desktop-menu
 732   // (see https://bugs.freedesktop.org/show_bug.cgi?id=66605).
 733   base::ReplaceChars(filename, " ", "_", &filename);
 734   return base::FilePath(filename.append(".desktop"));
 735 }
 736
 737 std::vector<base::FilePath> GetExistingProfileShortcutFilenames(
 738     const base::FilePath& profile_path,
 739     const base::FilePath& directory) {
 740   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 741   // Use a prefix, because xdg-desktop-menu requires it.
 742   std::string prefix(chrome::kBrowserProcessExecutableName);
 743   prefix.append("-");
 744   std::string suffix("-");
 745   suffix.append(profile_path.BaseName().value());
 746   base::i18n::ReplaceIllegalCharactersInPath(&suffix, '_');
 747   // Spaces in filenames break xdg-desktop-menu
 748   // (see https://bugs.freedesktop.org/show_bug.cgi?id=66605).
 749   base::ReplaceChars(suffix, " ", "_", &suffix);
 750   std::string glob = prefix + "*" + suffix + ".desktop";
 751
 752   base::FileEnumerator files(directory, false, base::FileEnumerator::FILES,
 753                              glob);
 754   base::FilePath shortcut_file = files.Next();
 755   std::vector<base::FilePath> shortcut_paths;
 756   while (!shortcut_file.empty()) {
 757     shortcut_paths.push_back(shortcut_file.BaseName());
 758     shortcut_file = files.Next();
 759   }
 760   return shortcut_paths;
 761 }
 762
 763 std::string GetDesktopFileContents(
 764     const base::FilePath& chrome_exe_path,
 765     const std::string& app_name,
 766     const GURL& url,
 767     const std::string& extension_id,
 768     const base::string16& title,
 769     const std::string& icon_name,
 770     const base::FilePath& profile_path,
 771     const std::string& categories,
 772     bool no_display) {
 773   CommandLine cmd_line = ShellIntegration::CommandLineArgsForLauncher(
 774       url, extension_id, profile_path);
 775   cmd_line.SetProgram(chrome_exe_path);
 776   return GetDesktopFileContentsForCommand(cmd_line, app_name, url, title,
 777                                           icon_name, categories, no_display);
 778 }
 779
 780 std::string GetDesktopFileContentsForCommand(
 781     const CommandLine& command_line,
 782     const std::string& app_name,
 783     const GURL& url,
 784     const base::string16& title,
 785     const std::string& icon_name,
 786     const std::string& categories,
 787     bool no_display) {
 788 #if defined(USE_GLIB)
 789   // Although not required by the spec, Nautilus on Ubuntu Karmic creates its
 790   // launchers with an xdg-open shebang. Follow that convention.
 791   std::string output_buffer = std::string(kXdgOpenShebang) + "\n";
 792
 793   // See http://standards.freedesktop.org/desktop-entry-spec/latest/
 794   GKeyFile* key_file = g_key_file_new();
 795
 796   // Set keys with fixed values.
 797   g_key_file_set_string(key_file, kDesktopEntry, "Version", "1.0");
 798   g_key_file_set_string(key_file, kDesktopEntry, "Terminal", "false");
 799   g_key_file_set_string(key_file, kDesktopEntry, "Type", "Application");
 800
 801   // Set the "Name" key.
 802   std::string final_title = base::UTF16ToUTF8(title);
 803   // Make sure no endline characters can slip in and possibly introduce
 804   // additional lines (like Exec, which makes it a security risk). Also
 805   // use the URL as a default when the title is empty.
 806   if (final_title.empty() ||
 807       final_title.find("\n") != std::string::npos ||
 808       final_title.find("\r") != std::string::npos) {
 809     final_title = url.spec();
 810   }
 811   g_key_file_set_string(key_file, kDesktopEntry, "Name", final_title.c_str());
 812
 813   // Set the "Exec" key.
 814   std::string final_path = QuoteCommandLineForDesktopFileExec(command_line);
 815   g_key_file_set_string(key_file, kDesktopEntry, "Exec", final_path.c_str());
 816
 817   // Set the "Icon" key.
 818   if (!icon_name.empty()) {
 819     g_key_file_set_string(key_file, kDesktopEntry, "Icon", icon_name.c_str());
 820   } else {
 821     g_key_file_set_string(key_file, kDesktopEntry, "Icon",
 822                           GetIconName().c_str());
 823   }
 824
 825   // Set the "Categories" key.
 826   if (!categories.empty()) {
 827     g_key_file_set_string(
 828         key_file, kDesktopEntry, "Categories", categories.c_str());
 829   }
 830
 831   // Set the "NoDisplay" key.
 832   if (no_display)
 833     g_key_file_set_string(key_file, kDesktopEntry, "NoDisplay", "true");
 834
 835   std::string wmclass = web_app::GetWMClassFromAppName(app_name);
 836   g_key_file_set_string(key_file, kDesktopEntry, "StartupWMClass",
 837                         wmclass.c_str());
 838
 839   gsize length = 0;
 840   gchar* data_dump = g_key_file_to_data(key_file, &length, NULL);
 841   if (data_dump) {
 842     // If strlen(data_dump[0]) == 0, this check will fail.
 843     if (data_dump[0] == '\n') {
 844       // Older versions of glib produce a leading newline. If this is the case,
 845       // remove it to avoid double-newline after the shebang.
 846       output_buffer += (data_dump + 1);
 847     } else {
 848       output_buffer += data_dump;
 849     }
 850     g_free(data_dump);
 851   }
 852
 853   g_key_file_free(key_file);
 854   return output_buffer;
 855 #else
 856   NOTIMPLEMENTED();
 857   return std::string();
 858 #endif
 859 }
 860
 861 std::string GetDirectoryFileContents(const base::string16& title,
 862                                      const std::string& icon_name) {
 863 #if defined(USE_GLIB)
 864   // See http://standards.freedesktop.org/desktop-entry-spec/latest/
 865   GKeyFile* key_file = g_key_file_new();
 866
 867   g_key_file_set_string(key_file, kDesktopEntry, "Version", "1.0");
 868   g_key_file_set_string(key_file, kDesktopEntry, "Type", "Directory");
 869   std::string final_title = base::UTF16ToUTF8(title);
 870   g_key_file_set_string(key_file, kDesktopEntry, "Name", final_title.c_str());
 871   if (!icon_name.empty()) {
 872     g_key_file_set_string(key_file, kDesktopEntry, "Icon", icon_name.c_str());
 873   } else {
 874     g_key_file_set_string(key_file, kDesktopEntry, "Icon",
 875                           GetIconName().c_str());
 876   }
 877
 878   gsize length = 0;
 879   gchar* data_dump = g_key_file_to_data(key_file, &length, NULL);
 880   std::string output_buffer;
 881   if (data_dump) {
 882     // If strlen(data_dump[0]) == 0, this check will fail.
 883     if (data_dump[0] == '\n') {
 884       // Older versions of glib produce a leading newline. If this is the case,
 885       // remove it to avoid double-newline after the shebang.
 886       output_buffer += (data_dump + 1);
 887     } else {
 888       output_buffer += data_dump;
 889     }
 890     g_free(data_dump);
 891   }
 892
 893   g_key_file_free(key_file);
 894   return output_buffer;
 895 #else
 896   NOTIMPLEMENTED();
 897   return std::string();
 898 #endif
 899 }
 900
 901 bool CreateDesktopShortcut(
 902     const web_app::ShortcutInfo& shortcut_info,
 903     const web_app::ShortcutLocations& creation_locations) {
 904   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 905
 906   base::FilePath shortcut_filename;
 907   if (!shortcut_info.extension_id.empty()) {
 908     shortcut_filename = GetExtensionShortcutFilename(
 909         shortcut_info.profile_path, shortcut_info.extension_id);
 910     // For extensions we do not want duplicate shortcuts. So, delete any that
 911     // already exist and replace them.
 912     if (creation_locations.on_desktop)
 913       DeleteShortcutOnDesktop(shortcut_filename);
 914
 915     if (creation_locations.applications_menu_location !=
 916             web_app::APP_MENU_LOCATION_NONE) {
 917       DeleteShortcutInApplicationsMenu(shortcut_filename, base::FilePath());
 918     }
 919   } else {
 920     shortcut_filename = GetWebShortcutFilename(shortcut_info.url);
 921   }
 922   if (shortcut_filename.empty())
 923     return false;
 924
 925   std::string icon_name =
 926       CreateShortcutIcon(shortcut_info.favicon, shortcut_filename);
 927
 928   std::string app_name =
 929       web_app::GenerateApplicationNameFromInfo(shortcut_info);
 930
 931   bool success = true;
 932
 933   base::FilePath chrome_exe_path = GetChromeExePath();
 934   if (chrome_exe_path.empty()) {
 935     LOG(WARNING) << "Could not get executable path.";
 936     return false;
 937   }
 938
 939   if (creation_locations.on_desktop) {
 940     std::string contents = GetDesktopFileContents(
 941         chrome_exe_path,
 942         app_name,
 943         shortcut_info.url,
 944         shortcut_info.extension_id,
 945         shortcut_info.title,
 946         icon_name,
 947         shortcut_info.profile_path,
 948         "",
 949         false);
 950     success = CreateShortcutOnDesktop(shortcut_filename, contents);
 951   }
 952
 953   if (creation_locations.applications_menu_location ==
 954           web_app::APP_MENU_LOCATION_NONE) {
 955     return success;
 956   }
 957
 958   base::FilePath directory_filename;
 959   std::string directory_contents;
 960   switch (creation_locations.applications_menu_location) {
 961     case web_app::APP_MENU_LOCATION_ROOT:
 962     case web_app::APP_MENU_LOCATION_HIDDEN:
 963       break;
 964     case web_app::APP_MENU_LOCATION_SUBDIR_CHROMEAPPS:
 965       directory_filename = base::FilePath(kDirectoryFilename);
 966       directory_contents = GetDirectoryFileContents(
 967           ShellIntegration::GetAppShortcutsSubdirName(), "");
 968       break;
 969     default:
 970       NOTREACHED();
 971       break;
 972   }
 973
 974   // Set NoDisplay=true if hidden. This will hide the application from
 975   // user-facing menus.
 976   std::string contents = GetDesktopFileContents(
 977       chrome_exe_path,
 978       app_name,
 979       shortcut_info.url,
 980       shortcut_info.extension_id,
 981       shortcut_info.title,
 982       icon_name,
 983       shortcut_info.profile_path,
 984       "",
 985       creation_locations.applications_menu_location ==
 986           web_app::APP_MENU_LOCATION_HIDDEN);
 987   success = CreateShortcutInApplicationsMenu(
 988       shortcut_filename, contents, directory_filename, directory_contents) &&
 989       success;
 990
 991   return success;
 992 }
 993
 994 bool CreateAppListDesktopShortcut(
 995     const std::string& wm_class,
 996     const std::string& title) {
 997   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 998
 999   base::FilePath desktop_name(kAppListDesktopName);
1000   base::FilePath shortcut_filename = desktop_name.AddExtension("desktop");
1001
1002   // We do not want duplicate shortcuts. Delete any that already exist and
1003   // replace them.
1004   DeleteShortcutInApplicationsMenu(shortcut_filename, base::FilePath());
1005
1006   base::FilePath chrome_exe_path = GetChromeExePath();
1007   if (chrome_exe_path.empty()) {
1008     LOG(WARNING) << "Could not get executable path.";
1009     return false;
1010   }
1011
1012   gfx::ImageFamily icon_images;
1013   ResourceBundle& resource_bundle = ResourceBundle::GetSharedInstance();
1014   icon_images.Add(*resource_bundle.GetImageSkiaNamed(IDR_APP_LIST_16));
1015   icon_images.Add(*resource_bundle.GetImageSkiaNamed(IDR_APP_LIST_32));
1016   icon_images.Add(*resource_bundle.GetImageSkiaNamed(IDR_APP_LIST_48));
1017   icon_images.Add(*resource_bundle.GetImageSkiaNamed(IDR_APP_LIST_256));
1018   std::string icon_name = CreateShortcutIcon(icon_images, desktop_name);
1019
1020   CommandLine command_line(chrome_exe_path);
1021   command_line.AppendSwitch(switches::kShowAppList);
1022   std::string contents =
1023       GetDesktopFileContentsForCommand(command_line,
1024                                        wm_class,
1025                                        GURL(),
1026                                        base::UTF8ToUTF16(title),
1027                                        icon_name,
1028                                        kAppListCategories,
1029                                        false);
1030   return CreateShortcutInApplicationsMenu(
1031       shortcut_filename, contents, base::FilePath(), "");
1032 }
1033
1034 void DeleteDesktopShortcuts(const base::FilePath& profile_path,
1035                             const std::string& extension_id) {
1036   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
1037
1038   base::FilePath shortcut_filename = GetExtensionShortcutFilename(
1039       profile_path, extension_id);
1040   DCHECK(!shortcut_filename.empty());
1041
1042   DeleteShortcutOnDesktop(shortcut_filename);
1043   // Delete shortcuts from |kDirectoryFilename|.
1044   // Note that it is possible that shortcuts were not created in the Chrome Apps
1045   // directory. It doesn't matter: this will still delete the shortcut even if
1046   // it isn't in the directory.
1047   DeleteShortcutInApplicationsMenu(shortcut_filename,
1048                                    base::FilePath(kDirectoryFilename));
1049 }
1050
1051 void DeleteAllDesktopShortcuts(const base::FilePath& profile_path) {
1052   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
1053
1054   scoped_ptr<base::Environment> env(base::Environment::Create());
1055
1056   // Delete shortcuts from Desktop.
1057   base::FilePath desktop_path;
1058   if (PathService::Get(base::DIR_USER_DESKTOP, &desktop_path)) {
1059     std::vector<base::FilePath> shortcut_filenames_desktop =
1060         GetExistingProfileShortcutFilenames(profile_path, desktop_path);
1061     for (std::vector<base::FilePath>::const_iterator it =
1062          shortcut_filenames_desktop.begin();
1063          it != shortcut_filenames_desktop.end(); ++it) {
1064       DeleteShortcutOnDesktop(*it);
1065     }
1066   }
1067
1068   // Delete shortcuts from |kDirectoryFilename|.
1069   base::FilePath applications_menu;
1070   if (GetDataWriteLocation(env.get(), &applications_menu)) {
1071     applications_menu = applications_menu.AppendASCII("applications");
1072     std::vector<base::FilePath> shortcut_filenames_app_menu =
1073         GetExistingProfileShortcutFilenames(profile_path, applications_menu);
1074     for (std::vector<base::FilePath>::const_iterator it =
1075          shortcut_filenames_app_menu.begin();
1076          it != shortcut_filenames_app_menu.end(); ++it) {
1077       DeleteShortcutInApplicationsMenu(*it,
1078                                        base::FilePath(kDirectoryFilename));
1079     }
1080   }
1081 }
1082
1083 }  // namespace shell_integration_linux