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/extensions/wallpaper_private_api.h"
  18 #include "chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager.h"
  19 #include "chrome/browser/profiles/profile.h"
  20 #include "chrome/common/chrome_paths.h"
  21 #include "chrome/common/extensions/extension_constants.h"
  22 #include "chrome/common/pref_names.h"
  23 #include "components/user_manager/user.h"
  24 #include "components/user_manager/user_manager.h"
  25 #include "components/wallpaper/wallpaper_layout.h"
  26 #include "extensions/browser/event_router.h"
  27 #include "net/base/load_flags.h"
  28 #include "net/http/http_status_code.h"
  29 #include "net/url_request/url_fetcher.h"
  30 #include "net/url_request/url_fetcher_delegate.h"
  31 #include "url/gurl.h"
  32
  33 using base::BinaryValue;
  34 using content::BrowserThread;
  35
  36 typedef base::Callback<void(bool success, const std::string&)> FetchCallback;
  37
  38 namespace set_wallpaper = extensions::api::wallpaper::SetWallpaper;
  39
  40 namespace {
  41
  42 class WallpaperFetcher : public net::URLFetcherDelegate {
  43  public:
  44   WallpaperFetcher() {}
  45
  46   ~WallpaperFetcher() override {}
  47
  48   void FetchWallpaper(const GURL& url, FetchCallback callback) {
  49     CancelPreviousFetch();
  50     callback_ = callback;
  51     url_fetcher_.reset(net::URLFetcher::Create(url,
  52                                                net::URLFetcher::GET,
  53                                                this));
  54     url_fetcher_->SetRequestContext(
  55         g_browser_process->system_request_context());
  56     url_fetcher_->SetLoadFlags(net::LOAD_DISABLE_CACHE);
  57     url_fetcher_->Start();
  58   }
  59
  60  private:
  61   // URLFetcherDelegate overrides:
  62   void OnURLFetchComplete(const net::URLFetcher* source) override {
  63     DCHECK(url_fetcher_.get() == source);
  64
  65     bool success = source->GetStatus().is_success() &&
  66                    source->GetResponseCode() == net::HTTP_OK;
  67     std::string response;
  68     if (success) {
  69       source->GetResponseAsString(&response);
  70     } else {
  71       response = base::StringPrintf(
  72           "Downloading wallpaper %s failed. The response code is %d.",
  73           source->GetOriginalURL().ExtractFileName().c_str(),
  74           source->GetResponseCode());
  75     }
  76     url_fetcher_.reset();
  77     callback_.Run(success, response);
  78     callback_.Reset();
  79   }
  80
  81   void CancelPreviousFetch() {
  82     if (url_fetcher_.get()) {
  83       callback_.Run(false, wallpaper_api_util::kCancelWallpaperMessage);
  84       callback_.Reset();
  85       url_fetcher_.reset();
  86     }
  87   }
  88
  89   scoped_ptr<net::URLFetcher> url_fetcher_;
  90   FetchCallback callback_;
  91 };
  92
  93 base::LazyInstance<WallpaperFetcher> g_wallpaper_fetcher =
  94     LAZY_INSTANCE_INITIALIZER;
  95
  96 }  // namespace
  97
  98 WallpaperSetWallpaperFunction::WallpaperSetWallpaperFunction() {
  99 }
 100
 101 WallpaperSetWallpaperFunction::~WallpaperSetWallpaperFunction() {
 102 }
 103
 104 bool WallpaperSetWallpaperFunction::RunAsync() {
 105   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 106   params_ = set_wallpaper::Params::Create(*args_);
 107   EXTENSION_FUNCTION_VALIDATE(params_);
 108
 109   // Gets email address and username hash while at UI thread.
 110   user_id_ = user_manager::UserManager::Get()->GetLoggedInUser()->email();
 111   user_id_hash_ =
 112       user_manager::UserManager::Get()->GetLoggedInUser()->username_hash();
 113
 114   if (params_->details.data) {
 115     StartDecode(*params_->details.data);
 116   } else {
 117     GURL wallpaper_url(*params_->details.url);
 118     if (wallpaper_url.is_valid()) {
 119       g_wallpaper_fetcher.Get().FetchWallpaper(
 120           wallpaper_url,
 121           base::Bind(&WallpaperSetWallpaperFunction::OnWallpaperFetched, this));
 122     } else {
 123       SetError("URL is invalid.");
 124       SendResponse(false);
 125     }
 126   }
 127   return true;
 128 }
 129
 130 void WallpaperSetWallpaperFunction::OnWallpaperDecoded(
 131     const gfx::ImageSkia& image) {
 132   chromeos::WallpaperManager* wallpaper_manager =
 133       chromeos::WallpaperManager::Get();
 134   base::FilePath thumbnail_path = wallpaper_manager->GetCustomWallpaperPath(
 135       wallpaper::kThumbnailWallpaperSubDir, user_id_hash_,
 136       params_->details.filename);
 137
 138   sequence_token_ = BrowserThread::GetBlockingPool()->GetNamedSequenceToken(
 139       wallpaper::kWallpaperSequenceTokenName);
 140   scoped_refptr<base::SequencedTaskRunner> task_runner =
 141       BrowserThread::GetBlockingPool()->
 142           GetSequencedTaskRunnerWithShutdownBehavior(sequence_token_,
 143               base::SequencedWorkerPool::BLOCK_SHUTDOWN);
 144   wallpaper::WallpaperLayout layout = wallpaper_api_util::GetLayoutEnum(
 145       extensions::api::wallpaper::ToString(params_->details.layout));
 146   bool update_wallpaper =
 147       user_id_ == user_manager::UserManager::Get()->GetActiveUser()->email();
 148   wallpaper_manager->SetCustomWallpaper(user_id_,
 149                                         user_id_hash_,
 150                                         params_->details.filename,
 151                                         layout,
 152                                         user_manager::User::CUSTOMIZED,
 153                                         image,
 154                                         update_wallpaper);
 155   unsafe_wallpaper_decoder_ = NULL;
 156
 157   if (params_->details.thumbnail) {
 158     image.EnsureRepsForSupportedScales();
 159     scoped_ptr<gfx::ImageSkia> deep_copy(image.DeepCopy());
 160     // Generates thumbnail before call api function callback. We can then
 161     // request thumbnail in the javascript callback.
 162     task_runner->PostTask(
 163         FROM_HERE,
 164         base::Bind(&WallpaperSetWallpaperFunction::GenerateThumbnail,
 165                    this,
 166                    thumbnail_path,
 167                    base::Passed(deep_copy.Pass())));
 168   } else {
 169     // Save current extenion name. It will be displayed in the component
 170     // wallpaper picker app. If current extension is the component wallpaper
 171     // picker, set an empty string.
 172     Profile* profile = Profile::FromBrowserContext(browser_context());
 173     if (extension()->id() == extension_misc::kWallpaperManagerId) {
 174       profile->GetPrefs()->SetString(prefs::kCurrentWallpaperAppName,
 175                                      std::string());
 176     } else {
 177       profile->GetPrefs()->SetString(prefs::kCurrentWallpaperAppName,
 178                                      extension()->name());
 179     }
 180     SendResponse(true);
 181   }
 182
 183   // Inform the native Wallpaper Picker Application that the current wallpaper
 184   // has been modified by a third party application.
 185   Profile* profile = Profile::FromBrowserContext(browser_context());
 186   extensions::EventRouter* event_router = extensions::EventRouter::Get(profile);
 187   scoped_ptr<base::ListValue> event_args(new base::ListValue());
 188   scoped_ptr<extensions::Event> event(
 189       new extensions::Event(extensions::api::wallpaper_private::
 190                                 OnWallpaperChangedBy3rdParty::kEventName,
 191                             event_args.Pass()));
 192   event_router->DispatchEventToExtension(extension_misc::kWallpaperManagerId,
 193                                          event.Pass());
 194 }
 195
 196 void WallpaperSetWallpaperFunction::GenerateThumbnail(
 197     const base::FilePath& thumbnail_path, scoped_ptr<gfx::ImageSkia> image) {
 198   DCHECK(BrowserThread::GetBlockingPool()->IsRunningSequenceOnCurrentThread(
 199       sequence_token_));
 200   if (!base::PathExists(thumbnail_path.DirName()))
 201     base::CreateDirectory(thumbnail_path.DirName());
 202
 203   scoped_refptr<base::RefCountedBytes> data;
 204   chromeos::WallpaperManager::Get()->ResizeImage(
 205       *image, wallpaper::WALLPAPER_LAYOUT_STRETCH,
 206       wallpaper::kWallpaperThumbnailWidth, wallpaper::kWallpaperThumbnailHeight,
 207       &data, NULL);
 208   BrowserThread::PostTask(
 209       BrowserThread::UI, FROM_HERE,
 210       base::Bind(
 211           &WallpaperSetWallpaperFunction::ThumbnailGenerated,
 212           this, data));
 213 }
 214
 215 void WallpaperSetWallpaperFunction::ThumbnailGenerated(
 216     base::RefCountedBytes* data) {
 217   BinaryValue* result = BinaryValue::CreateWithCopiedBuffer(
 218       reinterpret_cast<const char*>(data->front()), data->size());
 219   SetResult(result);
 220   SendResponse(true);
 221 }
 222
 223 void WallpaperSetWallpaperFunction::OnWallpaperFetched(
 224     bool success,
 225     const std::string& response) {
 226   if (success) {
 227     params_->details.data.reset(
 228         new std::vector<char>(response.begin(), response.end()));
 229     StartDecode(*params_->details.data);
 230   } else {
 231     SetError(response);
 232     SendResponse(false);
 233   }
 234 }