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_ = net::URLFetcher::Create(url, net::URLFetcher::GET, 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     callback_.Reset();
  77   }
  78
  79   void CancelPreviousFetch() {
  80     if (url_fetcher_.get()) {
  81       callback_.Run(false, wallpaper_api_util::kCancelWallpaperMessage);
  82       callback_.Reset();
  83       url_fetcher_.reset();
  84     }
  85   }
  86
  87   scoped_ptr<net::URLFetcher> url_fetcher_;
  88   FetchCallback callback_;
  89 };
  90
  91 base::LazyInstance<WallpaperFetcher> g_wallpaper_fetcher =
  92     LAZY_INSTANCE_INITIALIZER;
  93
  94 }  // namespace
  95
  96 WallpaperSetWallpaperFunction::WallpaperSetWallpaperFunction() {
  97 }
  98
  99 WallpaperSetWallpaperFunction::~WallpaperSetWallpaperFunction() {
 100 }
 101
 102 bool WallpaperSetWallpaperFunction::RunAsync() {
 103   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 104   params_ = set_wallpaper::Params::Create(*args_);
 105   EXTENSION_FUNCTION_VALIDATE(params_);
 106
 107   // Gets email address and username hash while at UI thread.
 108   user_id_ = user_manager::UserManager::Get()->GetLoggedInUser()->email();
 109   user_id_hash_ =
 110       user_manager::UserManager::Get()->GetLoggedInUser()->username_hash();
 111
 112   if (params_->details.data) {
 113     StartDecode(*params_->details.data);
 114   } else {
 115     GURL wallpaper_url(*params_->details.url);
 116     if (wallpaper_url.is_valid()) {
 117       g_wallpaper_fetcher.Get().FetchWallpaper(
 118           wallpaper_url,
 119           base::Bind(&WallpaperSetWallpaperFunction::OnWallpaperFetched, this));
 120     } else {
 121       SetError("URL is invalid.");
 122       SendResponse(false);
 123     }
 124   }
 125   return true;
 126 }
 127
 128 void WallpaperSetWallpaperFunction::OnWallpaperDecoded(
 129     const gfx::ImageSkia& image) {
 130   chromeos::WallpaperManager* wallpaper_manager =
 131       chromeos::WallpaperManager::Get();
 132   base::FilePath thumbnail_path = wallpaper_manager->GetCustomWallpaperPath(
 133       wallpaper::kThumbnailWallpaperSubDir, user_id_hash_,
 134       params_->details.filename);
 135
 136   sequence_token_ = BrowserThread::GetBlockingPool()->GetNamedSequenceToken(
 137       wallpaper::kWallpaperSequenceTokenName);
 138   scoped_refptr<base::SequencedTaskRunner> task_runner =
 139       BrowserThread::GetBlockingPool()->
 140           GetSequencedTaskRunnerWithShutdownBehavior(sequence_token_,
 141               base::SequencedWorkerPool::BLOCK_SHUTDOWN);
 142   wallpaper::WallpaperLayout layout = wallpaper_api_util::GetLayoutEnum(
 143       extensions::api::wallpaper::ToString(params_->details.layout));
 144   bool update_wallpaper =
 145       user_id_ == user_manager::UserManager::Get()->GetActiveUser()->email();
 146   wallpaper_manager->SetCustomWallpaper(user_id_,
 147                                         user_id_hash_,
 148                                         params_->details.filename,
 149                                         layout,
 150                                         user_manager::User::CUSTOMIZED,
 151                                         image,
 152                                         update_wallpaper);
 153   unsafe_wallpaper_decoder_ = NULL;
 154
 155   if (params_->details.thumbnail) {
 156     image.EnsureRepsForSupportedScales();
 157     scoped_ptr<gfx::ImageSkia> deep_copy(image.DeepCopy());
 158     // Generates thumbnail before call api function callback. We can then
 159     // request thumbnail in the javascript callback.
 160     task_runner->PostTask(
 161         FROM_HERE,
 162         base::Bind(&WallpaperSetWallpaperFunction::GenerateThumbnail,
 163                    this,
 164                    thumbnail_path,
 165                    base::Passed(deep_copy.Pass())));
 166   } else {
 167     // Save current extenion name. It will be displayed in the component
 168     // wallpaper picker app. If current extension is the component wallpaper
 169     // picker, set an empty string.
 170     Profile* profile = Profile::FromBrowserContext(browser_context());
 171     if (extension()->id() == extension_misc::kWallpaperManagerId) {
 172       profile->GetPrefs()->SetString(prefs::kCurrentWallpaperAppName,
 173                                      std::string());
 174     } else {
 175       profile->GetPrefs()->SetString(prefs::kCurrentWallpaperAppName,
 176                                      extension()->name());
 177     }
 178     SendResponse(true);
 179   }
 180
 181   // Inform the native Wallpaper Picker Application that the current wallpaper
 182   // has been modified by a third party application.
 183   Profile* profile = Profile::FromBrowserContext(browser_context());
 184   extensions::EventRouter* event_router = extensions::EventRouter::Get(profile);
 185   scoped_ptr<base::ListValue> event_args(new base::ListValue());
 186   scoped_ptr<extensions::Event> event(new extensions::Event(
 187       extensions::events::WALLPAPER_PRIVATE_ON_WALLPAPER_CHANGED_BY_3RD_PARTY,
 188       extensions::api::wallpaper_private::OnWallpaperChangedBy3rdParty::
 189           kEventName,
 190       event_args.Pass()));
 191   event_router->DispatchEventToExtension(extension_misc::kWallpaperManagerId,
 192                                          event.Pass());
 193 }
 194
 195 void WallpaperSetWallpaperFunction::GenerateThumbnail(
 196     const base::FilePath& thumbnail_path, scoped_ptr<gfx::ImageSkia> image) {
 197   DCHECK(BrowserThread::GetBlockingPool()->IsRunningSequenceOnCurrentThread(
 198       sequence_token_));
 199   if (!base::PathExists(thumbnail_path.DirName()))
 200     base::CreateDirectory(thumbnail_path.DirName());
 201
 202   scoped_refptr<base::RefCountedBytes> data;
 203   chromeos::WallpaperManager::Get()->ResizeImage(
 204       *image, wallpaper::WALLPAPER_LAYOUT_STRETCH,
 205       wallpaper::kWallpaperThumbnailWidth, wallpaper::kWallpaperThumbnailHeight,
 206       &data, NULL);
 207   BrowserThread::PostTask(
 208       BrowserThread::UI, FROM_HERE,
 209       base::Bind(
 210           &WallpaperSetWallpaperFunction::ThumbnailGenerated,
 211           this, data));
 212 }
 213
 214 void WallpaperSetWallpaperFunction::ThumbnailGenerated(
 215     base::RefCountedBytes* data) {
 216   BinaryValue* result = BinaryValue::CreateWithCopiedBuffer(
 217       reinterpret_cast<const char*>(data->front()), data->size());
 218   SetResult(result);
 219   SendResponse(true);
 220 }
 221
 222 void WallpaperSetWallpaperFunction::OnWallpaperFetched(
 223     bool success,
 224     const std::string& response) {
 225   if (success) {
 226     params_->details.data.reset(
 227         new std::vector<char>(response.begin(), response.end()));
 228     StartDecode(*params_->details.data);
 229   } else {
 230     SetError(response);
 231     SendResponse(false);
 232   }
 233 }