root/chrome/browser/chromeos/extensions/wallpaper_private_api.cc

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DEFINITIONS

This source file includes following definitions.
  1. IsOEMDefaultWallpaper
  2. SaveData
  3. GetData
  4. MinimizeInactiveWindows
  5. RestoreWindows
  6. BuildWindowListAndMinimizeInactiveForUser
  7. RestoreMinimizedWindows
  8. RemoveObserverIfUnreferenced
  9. OnWindowDestroyed
  10. RunImpl
  11. WallpaperPrivateSetWallpaperIfExistsFunction
  12. WallpaperPrivateSetWallpaperIfExistsFunction
  13. RunImpl
  14. ReadFileAndInitiateStartDecode
  15. OnWallpaperDecoded
  16. OnFileNotExists
  17. RunImpl
  18. OnWallpaperDecoded
  19. SaveToFile
  20. SetDecodedWallpaper
  21. WallpaperPrivateResetWallpaperFunction
  22. WallpaperPrivateResetWallpaperFunction
  23. RunImpl
  24. WallpaperPrivateSetCustomWallpaperFunction
  25. WallpaperPrivateSetCustomWallpaperFunction
  26. RunImpl
  27. OnWallpaperDecoded
  28. GenerateThumbnail
  29. ThumbnailGenerated
  30. WallpaperPrivateSetCustomWallpaperLayoutFunction
  31. WallpaperPrivateSetCustomWallpaperLayoutFunction
  32. RunImpl
  33. WallpaperPrivateMinimizeInactiveWindowsFunction
  34. WallpaperPrivateMinimizeInactiveWindowsFunction
  35. RunImpl
  36. WallpaperPrivateRestoreMinimizedWindowsFunction
  37. WallpaperPrivateRestoreMinimizedWindowsFunction
  38. RunImpl
  39. RunImpl
  40. Failure
  41. FileNotLoaded
  42. FileLoaded
  43. WallpaperPrivateSaveThumbnailFunction
  44. RunImpl
  45. Failure
  46. Success
  47. WallpaperPrivateGetOfflineWallpaperListFunction
  48. WallpaperPrivateGetOfflineWallpaperListFunction
  49. RunImpl
  50. GetList
  51. OnComplete
// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/chromeos/extensions/wallpaper_private_api.h"

#include <vector>

#include "ash/ash_switches.h"
#include "ash/desktop_background/desktop_background_controller.h"
#include "ash/shell.h"
#include "ash/wm/mru_window_tracker.h"
#include "ash/wm/window_state.h"
#include "ash/wm/window_util.h"
#include "base/command_line.h"
#include "base/file_util.h"
#include "base/files/file_enumerator.h"
#include "base/memory/scoped_ptr.h"
#include "base/path_service.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/stringprintf.h"
#include "base/threading/worker_pool.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/chromeos/login/user.h"
#include "chrome/browser/chromeos/login/user_image.h"
#include "chrome/browser/chromeos/login/user_manager.h"
#include "chrome/browser/chromeos/login/wallpaper_manager.h"
#include "chrome/common/chrome_paths.h"
#include "content/public/browser/browser_thread.h"
#include "extensions/browser/event_router.h"
#include "grit/app_locale_settings.h"
#include "grit/generated_resources.h"
#include "grit/platform_locale_settings.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/base/webui/web_ui_util.h"
#include "url/gurl.h"

using base::BinaryValue;
using content::BrowserThread;
namespace wallpaper_private = extensions::api::wallpaper_private;
namespace set_wallpaper_if_exists = wallpaper_private::SetWallpaperIfExists;
namespace set_wallpaper = wallpaper_private::SetWallpaper;
namespace set_custom_wallpaper = wallpaper_private::SetCustomWallpaper;
namespace set_custom_wallpaper_layout =
    wallpaper_private::SetCustomWallpaperLayout;
namespace get_thumbnail = wallpaper_private::GetThumbnail;
namespace save_thumbnail = wallpaper_private::SaveThumbnail;
namespace get_offline_wallpaper_list =
    wallpaper_private::GetOfflineWallpaperList;

namespace {

#if defined(GOOGLE_CHROME_BUILD)
const char kWallpaperManifestBaseURL[] = "https://commondatastorage.googleapis."
    "com/chromeos-wallpaper-public/manifest_";
#endif

bool IsOEMDefaultWallpaper() {
  return CommandLine::ForCurrentProcess()->HasSwitch(
      ash::switches::kAshDefaultWallpaperIsOem);
}

// Saves |data| as |file_name| to directory with |key|. Return false if the
// directory can not be found/created or failed to write file.
bool SaveData(int key, const std::string& file_name, const std::string& data) {
  base::FilePath data_dir;
  CHECK(PathService::Get(key, &data_dir));
  if (!base::DirectoryExists(data_dir) &&
      !base::CreateDirectory(data_dir)) {
    return false;
  }
  base::FilePath file_path = data_dir.Append(file_name);

  return base::PathExists(file_path) ||
         (base::WriteFile(file_path, data.c_str(), data.size()) != -1);
}

// Gets |file_name| from directory with |key|. Return false if the directory can
// not be found or failed to read file to string |data|. Note if the |file_name|
// can not be found in the directory, return true with empty |data|. It is
// expected that we may try to access file which did not saved yet.
bool GetData(const base::FilePath& path, std::string* data) {
  base::FilePath data_dir = path.DirName();
  if (!base::DirectoryExists(data_dir) &&
      !base::CreateDirectory(data_dir))
    return false;

  return !base::PathExists(path) ||
         base::ReadFileToString(path, data);
}

// WindowStateManager remembers which windows have been minimized in order to
// restore them when the wallpaper viewer is hidden.
class WindowStateManager : public aura::WindowObserver {
 public:
  typedef std::map<std::string, std::set<aura::Window*> >
      UserIDHashWindowListMap;

  // Minimizes all windows except the active window.
  static void MinimizeInactiveWindows(const std::string& user_id_hash);

  // Unminimizes all minimized windows restoring them to their previous state.
  // This should only be called after calling MinimizeInactiveWindows.
  static void RestoreWindows(const std::string& user_id_hash);

 private:
  WindowStateManager();

  virtual ~WindowStateManager();

  // Store all unminimized windows except |active_window| and minimize them.
  // All the windows are saved in a map and the key value is |user_id_hash|.
  void BuildWindowListAndMinimizeInactiveForUser(
      const std::string& user_id_hash, aura::Window* active_window);

  // Unminimize all the stored windows for |user_id_hash|.
  void RestoreMinimizedWindows(const std::string& user_id_hash);

  // Remove the observer from |window| if |window| is no longer referenced in
  // user_id_hash_window_list_map_.
  void RemoveObserverIfUnreferenced(aura::Window* window);

  // aura::WindowObserver overrides.
  virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE;

  // Map of user id hash and associated list of minimized windows.
  UserIDHashWindowListMap user_id_hash_window_list_map_;

  DISALLOW_COPY_AND_ASSIGN(WindowStateManager);
};

// static
WindowStateManager* g_window_state_manager = NULL;

// static
void WindowStateManager::MinimizeInactiveWindows(
    const std::string& user_id_hash) {
  if (!g_window_state_manager)
    g_window_state_manager = new WindowStateManager();
  g_window_state_manager->BuildWindowListAndMinimizeInactiveForUser(
      user_id_hash, ash::wm::GetActiveWindow());
}

// static
void WindowStateManager::RestoreWindows(const std::string& user_id_hash) {
  if (!g_window_state_manager) {
    DCHECK(false) << "This should only be called after calling "
                  << "MinimizeInactiveWindows.";
    return;
  }

  g_window_state_manager->RestoreMinimizedWindows(user_id_hash);
  if (g_window_state_manager->user_id_hash_window_list_map_.empty()) {
    delete g_window_state_manager;
    g_window_state_manager = NULL;
  }
}

WindowStateManager::WindowStateManager() {}

WindowStateManager::~WindowStateManager() {}

void WindowStateManager::BuildWindowListAndMinimizeInactiveForUser(
    const std::string& user_id_hash, aura::Window* active_window) {
  if (user_id_hash_window_list_map_.find(user_id_hash) ==
      user_id_hash_window_list_map_.end()) {
    user_id_hash_window_list_map_[user_id_hash] = std::set<aura::Window*>();
  }
  std::set<aura::Window*>* results =
      &user_id_hash_window_list_map_[user_id_hash];

  std::vector<aura::Window*> windows =
      ash::MruWindowTracker::BuildWindowList(false);

  for (std::vector<aura::Window*>::iterator iter = windows.begin();
       iter != windows.end(); ++iter) {
    // Ignore active window and minimized windows.
    if (*iter == active_window || ash::wm::GetWindowState(*iter)->IsMinimized())
      continue;

    // TODO(bshe): Add WindowStateObserver too. http://crbug.com/323252
    if (!(*iter)->HasObserver(this))
      (*iter)->AddObserver(this);

    results->insert(*iter);
    ash::wm::GetWindowState(*iter)->Minimize();
  }
}

void WindowStateManager::RestoreMinimizedWindows(
    const std::string& user_id_hash) {
  UserIDHashWindowListMap::iterator it =
      user_id_hash_window_list_map_.find(user_id_hash);
  if (it == user_id_hash_window_list_map_.end()) {
    DCHECK(false) << "This should only be called after calling "
                  << "MinimizeInactiveWindows.";
    return;
  }

  std::set<aura::Window*> removed_windows;
  removed_windows.swap(it->second);
  user_id_hash_window_list_map_.erase(it);

  for (std::set<aura::Window*>::iterator iter = removed_windows.begin();
       iter != removed_windows.end(); ++iter) {
    ash::wm::GetWindowState(*iter)->Unminimize();
    RemoveObserverIfUnreferenced(*iter);
  }
}

void WindowStateManager::RemoveObserverIfUnreferenced(aura::Window* window) {
  for (UserIDHashWindowListMap::iterator iter =
           user_id_hash_window_list_map_.begin();
       iter != user_id_hash_window_list_map_.end();
       ++iter) {
    if (iter->second.find(window) != iter->second.end())
      return;
  }
  // Remove observer if |window| is not observed by any users.
  window->RemoveObserver(this);
}

void WindowStateManager::OnWindowDestroyed(aura::Window* window) {
  for (UserIDHashWindowListMap::iterator iter =
           user_id_hash_window_list_map_.begin();
       iter != user_id_hash_window_list_map_.end();
       ++iter) {
    iter->second.erase(window);
  }
}

}  // namespace

bool WallpaperPrivateGetStringsFunction::RunImpl() {
  base::DictionaryValue* dict = new base::DictionaryValue();
  SetResult(dict);

#define SET_STRING(id, idr) \
  dict->SetString(id, l10n_util::GetStringUTF16(idr))
  SET_STRING("webFontFamily", IDS_WEB_FONT_FAMILY);
  SET_STRING("webFontSize", IDS_WEB_FONT_SIZE);
  SET_STRING("allCategoryLabel", IDS_WALLPAPER_MANAGER_ALL_CATEGORY_LABEL);
  SET_STRING("deleteCommandLabel", IDS_WALLPAPER_MANAGER_DELETE_COMMAND_LABEL);
  SET_STRING("customCategoryLabel",
             IDS_WALLPAPER_MANAGER_CUSTOM_CATEGORY_LABEL);
  SET_STRING("selectCustomLabel",
             IDS_WALLPAPER_MANAGER_SELECT_CUSTOM_LABEL);
  SET_STRING("positionLabel", IDS_WALLPAPER_MANAGER_POSITION_LABEL);
  SET_STRING("colorLabel", IDS_WALLPAPER_MANAGER_COLOR_LABEL);
  SET_STRING("centerCroppedLayout",
             IDS_OPTIONS_WALLPAPER_CENTER_CROPPED_LAYOUT);
  SET_STRING("centerLayout", IDS_OPTIONS_WALLPAPER_CENTER_LAYOUT);
  SET_STRING("stretchLayout", IDS_OPTIONS_WALLPAPER_STRETCH_LAYOUT);
  SET_STRING("connectionFailed", IDS_WALLPAPER_MANAGER_ACCESS_FAIL);
  SET_STRING("downloadFailed", IDS_WALLPAPER_MANAGER_DOWNLOAD_FAIL);
  SET_STRING("downloadCanceled", IDS_WALLPAPER_MANAGER_DOWNLOAD_CANCEL);
  SET_STRING("customWallpaperWarning",
             IDS_WALLPAPER_MANAGER_SHOW_CUSTOM_WALLPAPER_ON_START_WARNING);
  SET_STRING("accessFileFailure", IDS_WALLPAPER_MANAGER_ACCESS_FILE_FAILURE);
  SET_STRING("invalidWallpaper", IDS_WALLPAPER_MANAGER_INVALID_WALLPAPER);
  SET_STRING("surpriseMeLabel", IDS_WALLPAPER_MANAGER_SURPRISE_ME_LABEL);
  SET_STRING("learnMore", IDS_LEARN_MORE);
#undef SET_STRING

  webui::SetFontAndTextDirection(dict);

  chromeos::WallpaperManager* wallpaper_manager =
      chromeos::WallpaperManager::Get();
  chromeos::WallpaperInfo info;

  if (wallpaper_manager->GetLoggedInUserWallpaperInfo(&info))
    dict->SetString("currentWallpaper", info.file);

#if defined(GOOGLE_CHROME_BUILD)
  dict->SetString("manifestBaseURL", kWallpaperManifestBaseURL);
#endif

  dict->SetBoolean("isOEMDefaultWallpaper", IsOEMDefaultWallpaper());
  return true;
}

WallpaperPrivateSetWallpaperIfExistsFunction::
    WallpaperPrivateSetWallpaperIfExistsFunction() {}

WallpaperPrivateSetWallpaperIfExistsFunction::
    ~WallpaperPrivateSetWallpaperIfExistsFunction() {}

bool WallpaperPrivateSetWallpaperIfExistsFunction::RunImpl() {
  params = set_wallpaper_if_exists::Params::Create(*args_);
  EXTENSION_FUNCTION_VALIDATE(params);

  user_id_ = chromeos::UserManager::Get()->GetActiveUser()->email();

  base::FilePath wallpaper_path;
  base::FilePath fallback_path;
  ash::WallpaperResolution resolution = ash::Shell::GetInstance()->
      desktop_background_controller()->GetAppropriateResolution();

  std::string file_name = GURL(params->url).ExtractFileName();
  CHECK(PathService::Get(chrome::DIR_CHROMEOS_WALLPAPERS,
                         &wallpaper_path));
  fallback_path = wallpaper_path.Append(file_name);
  if (params->layout != wallpaper_private::WALLPAPER_LAYOUT_STRETCH &&
      resolution == ash::WALLPAPER_RESOLUTION_SMALL) {
    file_name = base::FilePath(file_name).InsertBeforeExtension(
        chromeos::kSmallWallpaperSuffix).value();
  }
  wallpaper_path = wallpaper_path.Append(file_name);

  sequence_token_ = BrowserThread::GetBlockingPool()->
      GetNamedSequenceToken(chromeos::kWallpaperSequenceTokenName);
  scoped_refptr<base::SequencedTaskRunner> task_runner =
      BrowserThread::GetBlockingPool()->
          GetSequencedTaskRunnerWithShutdownBehavior(sequence_token_,
              base::SequencedWorkerPool::CONTINUE_ON_SHUTDOWN);

  task_runner->PostTask(FROM_HERE,
      base::Bind(
          &WallpaperPrivateSetWallpaperIfExistsFunction::
              ReadFileAndInitiateStartDecode,
          this, wallpaper_path, fallback_path));
  return true;
}

void WallpaperPrivateSetWallpaperIfExistsFunction::
    ReadFileAndInitiateStartDecode(const base::FilePath& file_path,
                                   const base::FilePath& fallback_path) {
  DCHECK(BrowserThread::GetBlockingPool()->IsRunningSequenceOnCurrentThread(
      sequence_token_));
  std::string data;
  base::FilePath path = file_path;

  if (!base::PathExists(file_path))
    path = fallback_path;

  if (base::PathExists(path) &&
      base::ReadFileToString(path, &data)) {
    BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
        base::Bind(&WallpaperPrivateSetWallpaperIfExistsFunction::StartDecode,
                   this, data));
    return;
  }
  std::string error = base::StringPrintf(
        "Failed to set wallpaper %s from file system.",
        path.BaseName().value().c_str());
  BrowserThread::PostTask(
      BrowserThread::UI, FROM_HERE,
      base::Bind(&WallpaperPrivateSetWallpaperIfExistsFunction::OnFileNotExists,
                 this, error));
}

void WallpaperPrivateSetWallpaperIfExistsFunction::OnWallpaperDecoded(
    const gfx::ImageSkia& wallpaper) {
  // Set unsafe_wallpaper_decoder_ to null since the decoding already finished.
  unsafe_wallpaper_decoder_ = NULL;

  chromeos::WallpaperManager* wallpaper_manager =
      chromeos::WallpaperManager::Get();
  ash::WallpaperLayout layout = wallpaper_api_util::GetLayoutEnum(
      wallpaper_private::ToString(params->layout));

  bool update_wallpaper =
      user_id_ == chromeos::UserManager::Get()->GetActiveUser()->email();
  wallpaper_manager->SetWallpaperFromImageSkia(
      user_id_, wallpaper, layout, update_wallpaper);
  bool is_persistent =
      !chromeos::UserManager::Get()->IsCurrentUserNonCryptohomeDataEphemeral();
  chromeos::WallpaperInfo info = {
      params->url,
      layout,
      chromeos::User::ONLINE,
      base::Time::Now().LocalMidnight()
  };
  wallpaper_manager->SetUserWallpaperInfo(user_id_, info, is_persistent);
  SetResult(base::Value::CreateBooleanValue(true));
  SendResponse(true);
}

void WallpaperPrivateSetWallpaperIfExistsFunction::OnFileNotExists(
    const std::string& error) {
  SetResult(base::Value::CreateBooleanValue(false));
  OnFailure(error);
};

WallpaperPrivateSetWallpaperFunction::WallpaperPrivateSetWallpaperFunction() {
}

WallpaperPrivateSetWallpaperFunction::~WallpaperPrivateSetWallpaperFunction() {
}

bool WallpaperPrivateSetWallpaperFunction::RunImpl() {
  params = set_wallpaper::Params::Create(*args_);
  EXTENSION_FUNCTION_VALIDATE(params);

  // Gets email address while at UI thread.
  user_id_ = chromeos::UserManager::Get()->GetActiveUser()->email();

  StartDecode(params->wallpaper);

  return true;
}

void WallpaperPrivateSetWallpaperFunction::OnWallpaperDecoded(
    const gfx::ImageSkia& wallpaper) {
  wallpaper_ = wallpaper;
  // Set unsafe_wallpaper_decoder_ to null since the decoding already finished.
  unsafe_wallpaper_decoder_ = NULL;

  sequence_token_ = BrowserThread::GetBlockingPool()->
      GetNamedSequenceToken(chromeos::kWallpaperSequenceTokenName);
  scoped_refptr<base::SequencedTaskRunner> task_runner =
      BrowserThread::GetBlockingPool()->
          GetSequencedTaskRunnerWithShutdownBehavior(sequence_token_,
              base::SequencedWorkerPool::BLOCK_SHUTDOWN);

  task_runner->PostTask(FROM_HERE,
      base::Bind(&WallpaperPrivateSetWallpaperFunction::SaveToFile, this));
}

void WallpaperPrivateSetWallpaperFunction::SaveToFile() {
  DCHECK(BrowserThread::GetBlockingPool()->IsRunningSequenceOnCurrentThread(
      sequence_token_));
  std::string file_name = GURL(params->url).ExtractFileName();
  if (SaveData(chrome::DIR_CHROMEOS_WALLPAPERS, file_name, params->wallpaper)) {
    wallpaper_.EnsureRepsForSupportedScales();
    scoped_ptr<gfx::ImageSkia> deep_copy(wallpaper_.DeepCopy());
    // ImageSkia is not RefCountedThreadSafe. Use a deep copied ImageSkia if
    // post to another thread.
    BrowserThread::PostTask(
        BrowserThread::UI, FROM_HERE,
        base::Bind(&WallpaperPrivateSetWallpaperFunction::SetDecodedWallpaper,
                   this, base::Passed(&deep_copy)));
    chromeos::UserImage wallpaper(wallpaper_);

    base::FilePath wallpaper_dir;
    CHECK(PathService::Get(chrome::DIR_CHROMEOS_WALLPAPERS, &wallpaper_dir));
    base::FilePath file_path = wallpaper_dir.Append(
        file_name).InsertBeforeExtension(chromeos::kSmallWallpaperSuffix);
    if (base::PathExists(file_path))
      return;
    // Generates and saves small resolution wallpaper. Uses CENTER_CROPPED to
    // maintain the aspect ratio after resize.
    chromeos::WallpaperManager::Get()->ResizeAndSaveWallpaper(
        wallpaper,
        file_path,
        ash::WALLPAPER_LAYOUT_CENTER_CROPPED,
        ash::kSmallWallpaperMaxWidth,
        ash::kSmallWallpaperMaxHeight);
  } else {
    std::string error = base::StringPrintf(
        "Failed to create/write wallpaper to %s.", file_name.c_str());
    BrowserThread::PostTask(
        BrowserThread::UI, FROM_HERE,
        base::Bind(&WallpaperPrivateSetWallpaperFunction::OnFailure,
                   this, error));
  }
}

void WallpaperPrivateSetWallpaperFunction::SetDecodedWallpaper(
    scoped_ptr<gfx::ImageSkia> wallpaper) {
  chromeos::WallpaperManager* wallpaper_manager =
      chromeos::WallpaperManager::Get();

  ash::WallpaperLayout layout = wallpaper_api_util::GetLayoutEnum(
      wallpaper_private::ToString(params->layout));

  bool update_wallpaper =
      user_id_ == chromeos::UserManager::Get()->GetActiveUser()->email();
  wallpaper_manager->SetWallpaperFromImageSkia(
      user_id_, *wallpaper.get(), layout, update_wallpaper);

  bool is_persistent =
      !chromeos::UserManager::Get()->IsCurrentUserNonCryptohomeDataEphemeral();
  chromeos::WallpaperInfo info = {
      params->url,
      layout,
      chromeos::User::ONLINE,
      base::Time::Now().LocalMidnight()
  };
  wallpaper_manager->SetUserWallpaperInfo(user_id_, info, is_persistent);
  SendResponse(true);
}

WallpaperPrivateResetWallpaperFunction::
    WallpaperPrivateResetWallpaperFunction() {}

WallpaperPrivateResetWallpaperFunction::
    ~WallpaperPrivateResetWallpaperFunction() {}

bool WallpaperPrivateResetWallpaperFunction::RunImpl() {
  chromeos::WallpaperManager* wallpaper_manager =
      chromeos::WallpaperManager::Get();
  chromeos::UserManager* user_manager = chromeos::UserManager::Get();

  std::string user_id = user_manager->GetActiveUser()->email();
  wallpaper_manager->RemoveUserWallpaperInfo(user_id);

  chromeos::WallpaperInfo info = {
      "",
      ash::WALLPAPER_LAYOUT_CENTER,
      chromeos::User::DEFAULT,
      base::Time::Now().LocalMidnight()
  };
  bool is_persistent =
      !user_manager->IsCurrentUserNonCryptohomeDataEphemeral();
  wallpaper_manager->SetUserWallpaperInfo(user_id, info, is_persistent);

  wallpaper_manager->SetDefaultWallpaperNow(user_id);
  return true;
}

WallpaperPrivateSetCustomWallpaperFunction::
    WallpaperPrivateSetCustomWallpaperFunction() {}

WallpaperPrivateSetCustomWallpaperFunction::
    ~WallpaperPrivateSetCustomWallpaperFunction() {}

bool WallpaperPrivateSetCustomWallpaperFunction::RunImpl() {
  params = set_custom_wallpaper::Params::Create(*args_);
  EXTENSION_FUNCTION_VALIDATE(params);

  // Gets email address and username hash while at UI thread.
  user_id_ = chromeos::UserManager::Get()->GetActiveUser()->email();
  user_id_hash_ =
      chromeos::UserManager::Get()->GetActiveUser()->username_hash();

  StartDecode(params->wallpaper);

  return true;
}

void WallpaperPrivateSetCustomWallpaperFunction::OnWallpaperDecoded(
    const gfx::ImageSkia& wallpaper) {
  chromeos::WallpaperManager* wallpaper_manager =
      chromeos::WallpaperManager::Get();
  chromeos::UserImage::RawImage raw_image(params->wallpaper.begin(),
                                          params->wallpaper.end());
  chromeos::UserImage image(wallpaper, raw_image);
  base::FilePath thumbnail_path = wallpaper_manager->GetCustomWallpaperPath(
      chromeos::kThumbnailWallpaperSubDir, user_id_hash_, params->file_name);

  sequence_token_ = BrowserThread::GetBlockingPool()->
      GetNamedSequenceToken(chromeos::kWallpaperSequenceTokenName);
  scoped_refptr<base::SequencedTaskRunner> task_runner =
      BrowserThread::GetBlockingPool()->
          GetSequencedTaskRunnerWithShutdownBehavior(sequence_token_,
              base::SequencedWorkerPool::BLOCK_SHUTDOWN);

  ash::WallpaperLayout layout = wallpaper_api_util::GetLayoutEnum(
      wallpaper_private::ToString(params->layout));

  bool update_wallpaper =
      user_id_ == chromeos::UserManager::Get()->GetActiveUser()->email();
  wallpaper_manager->SetCustomWallpaper(user_id_,
                                        user_id_hash_,
                                        params->file_name,
                                        layout,
                                        chromeos::User::CUSTOMIZED,
                                        image,
                                        update_wallpaper);
  unsafe_wallpaper_decoder_ = NULL;

  if (params->generate_thumbnail) {
    wallpaper.EnsureRepsForSupportedScales();
    scoped_ptr<gfx::ImageSkia> deep_copy(wallpaper.DeepCopy());
    // Generates thumbnail before call api function callback. We can then
    // request thumbnail in the javascript callback.
    task_runner->PostTask(FROM_HERE,
        base::Bind(
            &WallpaperPrivateSetCustomWallpaperFunction::GenerateThumbnail,
            this, thumbnail_path, base::Passed(&deep_copy)));
  } else {
    SendResponse(true);
  }
}

void WallpaperPrivateSetCustomWallpaperFunction::GenerateThumbnail(
    const base::FilePath& thumbnail_path, scoped_ptr<gfx::ImageSkia> image) {
  DCHECK(BrowserThread::GetBlockingPool()->IsRunningSequenceOnCurrentThread(
      sequence_token_));
  chromeos::UserImage wallpaper(*image.get());
  if (!base::PathExists(thumbnail_path.DirName()))
    base::CreateDirectory(thumbnail_path.DirName());

  scoped_refptr<base::RefCountedBytes> data;
  chromeos::WallpaperManager::Get()->ResizeWallpaper(
      wallpaper,
      ash::WALLPAPER_LAYOUT_STRETCH,
      ash::kWallpaperThumbnailWidth,
      ash::kWallpaperThumbnailHeight,
      &data);
  BrowserThread::PostTask(
        BrowserThread::UI, FROM_HERE,
        base::Bind(
            &WallpaperPrivateSetCustomWallpaperFunction::ThumbnailGenerated,
            this, data));
}

void WallpaperPrivateSetCustomWallpaperFunction::ThumbnailGenerated(
    base::RefCountedBytes* data) {
  BinaryValue* result = BinaryValue::CreateWithCopiedBuffer(
      reinterpret_cast<const char*>(data->front()), data->size());
  SetResult(result);
  SendResponse(true);
}

WallpaperPrivateSetCustomWallpaperLayoutFunction::
    WallpaperPrivateSetCustomWallpaperLayoutFunction() {}

WallpaperPrivateSetCustomWallpaperLayoutFunction::
    ~WallpaperPrivateSetCustomWallpaperLayoutFunction() {}

bool WallpaperPrivateSetCustomWallpaperLayoutFunction::RunImpl() {
  scoped_ptr<set_custom_wallpaper_layout::Params> params(
      set_custom_wallpaper_layout::Params::Create(*args_));
  EXTENSION_FUNCTION_VALIDATE(params);

  chromeos::WallpaperManager* wallpaper_manager =
      chromeos::WallpaperManager::Get();
  chromeos::WallpaperInfo info;
  wallpaper_manager->GetLoggedInUserWallpaperInfo(&info);
  if (info.type != chromeos::User::CUSTOMIZED) {
    SetError("Only custom wallpaper can change layout.");
    SendResponse(false);
    return false;
  }
  info.layout = wallpaper_api_util::GetLayoutEnum(
      wallpaper_private::ToString(params->layout));

  std::string email = chromeos::UserManager::Get()->GetActiveUser()->email();
  bool is_persistent =
      !chromeos::UserManager::Get()->IsCurrentUserNonCryptohomeDataEphemeral();
  wallpaper_manager->SetUserWallpaperInfo(email, info, is_persistent);
  wallpaper_manager->UpdateWallpaper(false /* clear_cache */);
  SendResponse(true);

  // Gets email address while at UI thread.
  return true;
}

WallpaperPrivateMinimizeInactiveWindowsFunction::
    WallpaperPrivateMinimizeInactiveWindowsFunction() {
}

WallpaperPrivateMinimizeInactiveWindowsFunction::
    ~WallpaperPrivateMinimizeInactiveWindowsFunction() {
}

bool WallpaperPrivateMinimizeInactiveWindowsFunction::RunImpl() {
  WindowStateManager::MinimizeInactiveWindows(
      chromeos::UserManager::Get()->GetActiveUser()->username_hash());
  return true;
}

WallpaperPrivateRestoreMinimizedWindowsFunction::
    WallpaperPrivateRestoreMinimizedWindowsFunction() {
}

WallpaperPrivateRestoreMinimizedWindowsFunction::
    ~WallpaperPrivateRestoreMinimizedWindowsFunction() {
}

bool WallpaperPrivateRestoreMinimizedWindowsFunction::RunImpl() {
  WindowStateManager::RestoreWindows(
      chromeos::UserManager::Get()->GetActiveUser()->username_hash());
  return true;
}

WallpaperPrivateGetThumbnailFunction::WallpaperPrivateGetThumbnailFunction() {
}

WallpaperPrivateGetThumbnailFunction::~WallpaperPrivateGetThumbnailFunction() {
}

bool WallpaperPrivateGetThumbnailFunction::RunImpl() {
  scoped_ptr<get_thumbnail::Params> params(
      get_thumbnail::Params::Create(*args_));
  EXTENSION_FUNCTION_VALIDATE(params);

  base::FilePath thumbnail_path;
  std::string email = chromeos::UserManager::Get()->GetActiveUser()->email();
  if (params->source == get_thumbnail::Params::SOURCE_ONLINE) {
    std::string file_name = GURL(params->url_or_file).ExtractFileName();
    CHECK(PathService::Get(chrome::DIR_CHROMEOS_WALLPAPER_THUMBNAILS,
                           &thumbnail_path));
    thumbnail_path = thumbnail_path.Append(file_name);
  } else {
    if (!IsOEMDefaultWallpaper()) {
      SetError("No OEM wallpaper.");
      SendResponse(false);
      return false;
    }

    // TODO(bshe): Small resolution wallpaper is used here as wallpaper
    // thumbnail. We should either resize it or include a wallpaper thumbnail in
    // addition to large and small wallpaper resolutions.
    thumbnail_path = CommandLine::ForCurrentProcess()->GetSwitchValuePath(
        ash::switches::kAshDefaultWallpaperSmall);
  }

  sequence_token_ = BrowserThread::GetBlockingPool()->
      GetNamedSequenceToken(chromeos::kWallpaperSequenceTokenName);
  scoped_refptr<base::SequencedTaskRunner> task_runner =
      BrowserThread::GetBlockingPool()->
          GetSequencedTaskRunnerWithShutdownBehavior(sequence_token_,
              base::SequencedWorkerPool::CONTINUE_ON_SHUTDOWN);

  task_runner->PostTask(FROM_HERE,
      base::Bind(&WallpaperPrivateGetThumbnailFunction::Get, this,
                 thumbnail_path));
  return true;
}

void WallpaperPrivateGetThumbnailFunction::Failure(
    const std::string& file_name) {
  SetError(base::StringPrintf("Failed to access wallpaper thumbnails for %s.",
                              file_name.c_str()));
  SendResponse(false);
}

void WallpaperPrivateGetThumbnailFunction::FileNotLoaded() {
  SendResponse(true);
}

void WallpaperPrivateGetThumbnailFunction::FileLoaded(
    const std::string& data) {
  BinaryValue* thumbnail = BinaryValue::CreateWithCopiedBuffer(data.c_str(),
                                                               data.size());
  SetResult(thumbnail);
  SendResponse(true);
}

void WallpaperPrivateGetThumbnailFunction::Get(const base::FilePath& path) {
  DCHECK(BrowserThread::GetBlockingPool()->IsRunningSequenceOnCurrentThread(
      sequence_token_));
  std::string data;
  if (GetData(path, &data)) {
    if (data.empty()) {
      BrowserThread::PostTask(
        BrowserThread::UI, FROM_HERE,
        base::Bind(&WallpaperPrivateGetThumbnailFunction::FileNotLoaded, this));
    } else {
      BrowserThread::PostTask(
        BrowserThread::UI, FROM_HERE,
        base::Bind(&WallpaperPrivateGetThumbnailFunction::FileLoaded, this,
                   data));
    }
  } else {
    BrowserThread::PostTask(
        BrowserThread::UI, FROM_HERE,
        base::Bind(&WallpaperPrivateGetThumbnailFunction::Failure, this,
                   path.BaseName().value()));
  }
}

WallpaperPrivateSaveThumbnailFunction::WallpaperPrivateSaveThumbnailFunction() {
}

WallpaperPrivateSaveThumbnailFunction::
    ~WallpaperPrivateSaveThumbnailFunction() {}

bool WallpaperPrivateSaveThumbnailFunction::RunImpl() {
  scoped_ptr<save_thumbnail::Params> params(
      save_thumbnail::Params::Create(*args_));
  EXTENSION_FUNCTION_VALIDATE(params);

  sequence_token_ = BrowserThread::GetBlockingPool()->
      GetNamedSequenceToken(chromeos::kWallpaperSequenceTokenName);
  scoped_refptr<base::SequencedTaskRunner> task_runner =
      BrowserThread::GetBlockingPool()->
          GetSequencedTaskRunnerWithShutdownBehavior(sequence_token_,
              base::SequencedWorkerPool::CONTINUE_ON_SHUTDOWN);

  task_runner->PostTask(FROM_HERE,
      base::Bind(&WallpaperPrivateSaveThumbnailFunction::Save,
                 this, params->data, GURL(params->url).ExtractFileName()));
  return true;
}

void WallpaperPrivateSaveThumbnailFunction::Failure(
    const std::string& file_name) {
  SetError(base::StringPrintf("Failed to create/write thumbnail of %s.",
                              file_name.c_str()));
  SendResponse(false);
}

void WallpaperPrivateSaveThumbnailFunction::Success() {
  SendResponse(true);
}

void WallpaperPrivateSaveThumbnailFunction::Save(const std::string& data,
                                          const std::string& file_name) {
  DCHECK(BrowserThread::GetBlockingPool()->IsRunningSequenceOnCurrentThread(
      sequence_token_));
  if (SaveData(chrome::DIR_CHROMEOS_WALLPAPER_THUMBNAILS, file_name, data)) {
    BrowserThread::PostTask(
      BrowserThread::UI, FROM_HERE,
      base::Bind(&WallpaperPrivateSaveThumbnailFunction::Success, this));
  } else {
    BrowserThread::PostTask(
          BrowserThread::UI, FROM_HERE,
          base::Bind(&WallpaperPrivateSaveThumbnailFunction::Failure,
                     this, file_name));
  }
}

WallpaperPrivateGetOfflineWallpaperListFunction::
    WallpaperPrivateGetOfflineWallpaperListFunction() {
}

WallpaperPrivateGetOfflineWallpaperListFunction::
    ~WallpaperPrivateGetOfflineWallpaperListFunction() {
}

bool WallpaperPrivateGetOfflineWallpaperListFunction::RunImpl() {
  sequence_token_ = BrowserThread::GetBlockingPool()->
      GetNamedSequenceToken(chromeos::kWallpaperSequenceTokenName);
  scoped_refptr<base::SequencedTaskRunner> task_runner =
      BrowserThread::GetBlockingPool()->
          GetSequencedTaskRunnerWithShutdownBehavior(sequence_token_,
              base::SequencedWorkerPool::CONTINUE_ON_SHUTDOWN);

  task_runner->PostTask(FROM_HERE,
      base::Bind(&WallpaperPrivateGetOfflineWallpaperListFunction::GetList,
                 this));
  return true;
}

void WallpaperPrivateGetOfflineWallpaperListFunction::GetList() {
  DCHECK(BrowserThread::GetBlockingPool()->IsRunningSequenceOnCurrentThread(
      sequence_token_));
  std::vector<std::string> file_list;
  base::FilePath wallpaper_dir;
  CHECK(PathService::Get(chrome::DIR_CHROMEOS_WALLPAPERS, &wallpaper_dir));
  if (base::DirectoryExists(wallpaper_dir)) {
    base::FileEnumerator files(wallpaper_dir, false,
                               base::FileEnumerator::FILES);
    for (base::FilePath current = files.Next(); !current.empty();
         current = files.Next()) {
      std::string file_name = current.BaseName().RemoveExtension().value();
      // Do not add file name of small resolution wallpaper to the list.
      if (!EndsWith(file_name, chromeos::kSmallWallpaperSuffix, true))
        file_list.push_back(current.BaseName().value());
    }
  }
  BrowserThread::PostTask(
      BrowserThread::UI, FROM_HERE,
      base::Bind(&WallpaperPrivateGetOfflineWallpaperListFunction::OnComplete,
                 this, file_list));
}

void WallpaperPrivateGetOfflineWallpaperListFunction::OnComplete(
    const std::vector<std::string>& file_list) {
  base::ListValue* results = new base::ListValue();
  results->AppendStrings(file_list);
  SetResult(results);
  SendResponse(true);
}
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