chrome/browser/chromeos/extensions/wallpaper_api.cc

   1 // Copyright 2013 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/chromeos/extensions/wallpaper_api.h"
   6
   7 #include <string>
   8 #include <vector>
   9
  10 #include "ash/desktop_background/desktop_background_controller.h"
  11 #include "base/files/file_util.h"
  12 #include "base/lazy_instance.h"
  13 #include "base/prefs/pref_service.h"
  14 #include "base/strings/stringprintf.h"
  15 #include "base/threading/worker_pool.h"
  16 #include "chrome/browser/browser_process.h"
  17 #include "chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager.h"
  18 #include "chrome/browser/profiles/profile.h"
  19 #include "chrome/common/chrome_paths.h"
  20 #include "chrome/common/extensions/extension_constants.h"
  21 #include "chrome/common/pref_names.h"
  22 #include "components/user_manager/user.h"
  23 #include "components/user_manager/user_manager.h"
  24 #include "components/wallpaper/wallpaper_layout.h"
  25 #include "net/base/load_flags.h"
  26 #include "net/http/http_status_code.h"
  27 #include "net/url_request/url_fetcher.h"
  28 #include "net/url_request/url_fetcher_delegate.h"
  29 #include "url/gurl.h"
  30
  31 using base::BinaryValue;
  32 using content::BrowserThread;
  33
  34 typedef base::Callback<void(bool success, const std::string&)> FetchCallback;
  35
  36 namespace set_wallpaper = extensions::api::wallpaper::SetWallpaper;
  37
  38 namespace {
  39
  40 class WallpaperFetcher : public net::URLFetcherDelegate {
  41  public:
  42   WallpaperFetcher() {}
  43
  44   ~WallpaperFetcher() override {}
  45
  46   void FetchWallpaper(const GURL& url, FetchCallback callback) {
  47     CancelPreviousFetch();
  48     callback_ = callback;
  49     url_fetcher_.reset(net::URLFetcher::Create(url,
  50                                                net::URLFetcher::GET,
  51                                                this));
  52     url_fetcher_->SetRequestContext(
  53         g_browser_process->system_request_context());
  54     url_fetcher_->SetLoadFlags(net::LOAD_DISABLE_CACHE);
  55     url_fetcher_->Start();
  56   }
  57
  58  private:
  59   // URLFetcherDelegate overrides:
  60   void OnURLFetchComplete(const net::URLFetcher* source) override {
  61     DCHECK(url_fetcher_.get() == source);
  62
  63     bool success = source->GetStatus().is_success() &&
  64                    source->GetResponseCode() == net::HTTP_OK;
  65     std::string response;
  66     if (success) {
  67       source->GetResponseAsString(&response);
  68     } else {
  69       response = base::StringPrintf(
  70           "Downloading wallpaper %s failed. The response code is %d.",
  71           source->GetOriginalURL().ExtractFileName().c_str(),
  72           source->GetResponseCode());
  73     }
  74     url_fetcher_.reset();
  75     callback_.Run(success, response);
  76   }
  77
  78   void CancelPreviousFetch() {
  79     if (url_fetcher_.get()) {
  80       callback_.Run(false, wallpaper_api_util::kCancelWallpaperMessage);
  81       url_fetcher_.reset();
  82     }
  83   }
  84
  85   scoped_ptr<net::URLFetcher> url_fetcher_;
  86   FetchCallback callback_;
  87 };
  88
  89 base::LazyInstance<WallpaperFetcher> g_wallpaper_fetcher =
  90     LAZY_INSTANCE_INITIALIZER;
  91
  92 }  // namespace
  93
  94 WallpaperSetWallpaperFunction::WallpaperSetWallpaperFunction() {
  95 }
  96
  97 WallpaperSetWallpaperFunction::~WallpaperSetWallpaperFunction() {
  98 }
  99
 100 bool WallpaperSetWallpaperFunction::RunAsync() {
 101   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 102   params_ = set_wallpaper::Params::Create(*args_);
 103   EXTENSION_FUNCTION_VALIDATE(params_);
 104
 105   // Gets email address and username hash while at UI thread.
 106   user_id_ = user_manager::UserManager::Get()->GetLoggedInUser()->email();
 107   user_id_hash_ =
 108       user_manager::UserManager::Get()->GetLoggedInUser()->username_hash();
 109
 110   if (params_->details.data) {
 111     StartDecode(*params_->details.data);
 112   } else {
 113     GURL wallpaper_url(*params_->details.url);
 114     if (wallpaper_url.is_valid()) {
 115       g_wallpaper_fetcher.Get().FetchWallpaper(
 116           wallpaper_url,
 117           base::Bind(&WallpaperSetWallpaperFunction::OnWallpaperFetched, this));
 118     } else {
 119       SetError("URL is invalid.");
 120       SendResponse(false);
 121     }
 122   }
 123   return true;
 124 }
 125
 126 void WallpaperSetWallpaperFunction::OnWallpaperDecoded(
 127     const gfx::ImageSkia& image) {
 128   chromeos::WallpaperManager* wallpaper_manager =
 129       chromeos::WallpaperManager::Get();
 130   base::FilePath thumbnail_path = wallpaper_manager->GetCustomWallpaperPath(
 131       wallpaper::kThumbnailWallpaperSubDir, user_id_hash_,
 132       params_->details.filename);
 133
 134   sequence_token_ = BrowserThread::GetBlockingPool()->GetNamedSequenceToken(
 135       wallpaper::kWallpaperSequenceTokenName);
 136   scoped_refptr<base::SequencedTaskRunner> task_runner =
 137       BrowserThread::GetBlockingPool()->
 138           GetSequencedTaskRunnerWithShutdownBehavior(sequence_token_,
 139               base::SequencedWorkerPool::BLOCK_SHUTDOWN);
 140   wallpaper::WallpaperLayout layout = wallpaper_api_util::GetLayoutEnum(
 141       set_wallpaper::Params::Details::ToString(params_->details.layout));
 142   bool update_wallpaper =
 143       user_id_ == user_manager::UserManager::Get()->GetActiveUser()->email();
 144   wallpaper_manager->SetCustomWallpaper(user_id_,
 145                                         user_id_hash_,
 146                                         params_->details.filename,
 147                                         layout,
 148                                         user_manager::User::CUSTOMIZED,
 149                                         image,
 150                                         update_wallpaper);
 151   unsafe_wallpaper_decoder_ = NULL;
 152
 153   if (params_->details.thumbnail) {
 154     image.EnsureRepsForSupportedScales();
 155     scoped_ptr<gfx::ImageSkia> deep_copy(image.DeepCopy());
 156     // Generates thumbnail before call api function callback. We can then
 157     // request thumbnail in the javascript callback.
 158     task_runner->PostTask(
 159         FROM_HERE,
 160         base::Bind(&WallpaperSetWallpaperFunction::GenerateThumbnail,
 161                    this,
 162                    thumbnail_path,
 163                    base::Passed(deep_copy.Pass())));
 164   } else {
 165     // Save current extenion name. It will be displayed in the component
 166     // wallpaper picker app. If current extension is the component wallpaper
 167     // picker, set an empty string.
 168     Profile* profile = Profile::FromBrowserContext(browser_context());
 169     if (extension()->id() == extension_misc::kWallpaperManagerId) {
 170       profile->GetPrefs()->SetString(prefs::kCurrentWallpaperAppName,
 171                                      std::string());
 172     } else {
 173       profile->GetPrefs()->SetString(prefs::kCurrentWallpaperAppName,
 174                                      extension()->name());
 175     }
 176     SendResponse(true);
 177   }
 178 }
 179
 180 void WallpaperSetWallpaperFunction::GenerateThumbnail(
 181     const base::FilePath& thumbnail_path, scoped_ptr<gfx::ImageSkia> image) {
 182   DCHECK(BrowserThread::GetBlockingPool()->IsRunningSequenceOnCurrentThread(
 183       sequence_token_));
 184   if (!base::PathExists(thumbnail_path.DirName()))
 185     base::CreateDirectory(thumbnail_path.DirName());
 186
 187   scoped_refptr<base::RefCountedBytes> data;
 188   chromeos::WallpaperManager::Get()->ResizeImage(
 189       *image, wallpaper::WALLPAPER_LAYOUT_STRETCH,
 190       wallpaper::kWallpaperThumbnailWidth, wallpaper::kWallpaperThumbnailHeight,
 191       &data, NULL);
 192   BrowserThread::PostTask(
 193       BrowserThread::UI, FROM_HERE,
 194       base::Bind(
 195           &WallpaperSetWallpaperFunction::ThumbnailGenerated,
 196           this, data));
 197 }
 198
 199 void WallpaperSetWallpaperFunction::ThumbnailGenerated(
 200     base::RefCountedBytes* data) {
 201   BinaryValue* result = BinaryValue::CreateWithCopiedBuffer(
 202       reinterpret_cast<const char*>(data->front()), data->size());
 203   SetResult(result);
 204   SendResponse(true);
 205 }
 206
 207 void WallpaperSetWallpaperFunction::OnWallpaperFetched(
 208     bool success,
 209     const std::string& response) {
 210   if (success) {
 211     params_->details.data.reset(
 212         new std::vector<char>(response.begin(), response.end()));
 213     StartDecode(*params_->details.data);
 214   } else {
 215     SetError(response);
 216     SendResponse(false);
 217   }
 218 }