Use URLFetcher to download ChromeOS recovery image config file

Initialization of BurnManager is deferred since it depends on IO thread through BrowserProcess::system_request_context.

BUG=113469
TEST=Open chrome://imageburner on a Chromebook, ensure it works.


Review URL: http://codereview.chromium.org/9568001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@124638 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 44 insertions, 116 deletions

diff --git a/chrome/browser/chromeos/imageburner/burn_controller.cc b/chrome/browser/chromeos/imageburner/burn_controller.cc
index cf6a247..ed01efc 100644
--- a/chrome/browser/chromeos/imageburner/burn_controller.cc
+++ b/chrome/browser/chromeos/imageburner/burn_controller.cc
@@ -211,7 +211,7 @@ class BurnControllerImpl
     if (success) {
       zip_image_file_path_ =
           burn_manager_->GetImageDir().Append(kImageZipFileName);
-      burn_manager_->FetchConfigFile(web_contents_, this);
+      burn_manager_->FetchConfigFile(this);
     } else {
       DownloadCompleted(success);
     }
diff --git a/chrome/browser/chromeos/imageburner/burn_manager.cc b/chrome/browser/chromeos/imageburner/burn_manager.cc
index 3bc090b..d786111 100644
--- a/chrome/browser/chromeos/imageburner/burn_manager.cc
+++ b/chrome/browser/chromeos/imageburner/burn_manager.cc
@@ -8,18 +8,19 @@
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/string_util.h"
+#include "chrome/browser/browser_process.h"
 #include "chrome/browser/download/download_util.h"
-#include "chrome/browser/tab_contents/tab_util.h"
 #include "chrome/common/chrome_paths.h"
 #include "content/browser/download/download_types.h"
-#include "content/browser/renderer_host/render_view_host.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
-#include "content/public/browser/render_process_host.h"
+#include "content/public/browser/download_manager.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/common/url_fetcher.h"
+#include "net/base/file_stream.h"
+#include "net/url_request/url_request_status.h"
 
 using content::BrowserThread;
-using content::DownloadItem;
 using content::DownloadManager;
 using content::WebContents;
 
@@ -31,7 +32,6 @@ namespace {
 const char kConfigFileUrl[] =
     "https://dl.google.com/dl/edgedl/chromeos/recovery/recovery.conf";
 const char kTempImageFolderName[] = "chromeos_image";
-const char kConfigFileName[] = "recovery.conf";
 
 BurnManager* g_burn_manager = NULL;
 
@@ -43,16 +43,6 @@ void CreateDirectory(const FilePath& path,
                           base::Bind(callback, success));
 }
 
-// Reads file content and calls |callback| with the result on UI thread.
-void ReadFile(const FilePath& path,
-              base::Callback<void(bool success,
-                                  const std::string& file_content)> callback) {
-  std::string file_content;
-  const bool success = file_util::ReadFileToString(path, &file_content);
-  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
-                          base::Bind(callback, success, file_content));
-}
-
 // Creates a FileStream and calls |callback| with the result on UI thread.
 void CreateFileStream(
     const FilePath& file_path,
@@ -229,12 +219,7 @@ void StateMachine::OnCancelation() {
 
 BurnManager::BurnManager()
     : weak_ptr_factory_(this),
-      download_manager_(NULL),
-      download_item_observer_added_(false),
-      active_download_item_(NULL),
       config_file_url_(kConfigFileUrl),
-      config_file_requested_(false),
-      config_file_fetched_(false),
       state_machine_(new StateMachine()),
       downloader_(NULL) {
 }
@@ -243,10 +228,6 @@ BurnManager::~BurnManager() {
   if (!image_dir_.empty()) {
     file_util::Delete(image_dir_, true);
   }
-  if (active_download_item_)
-    active_download_item_->RemoveObserver(this);
-  if (download_manager_)
-    download_manager_->RemoveObserver(this);
 }
 
 // static
@@ -275,49 +256,6 @@ BurnManager* BurnManager::GetInstance() {
   return g_burn_manager;
 }
 
-void BurnManager::OnDownloadUpdated(DownloadItem* download) {
-  if (download->IsCancelled()) {
-    ConfigFileFetched(false, "");
-    DCHECK(!download_item_observer_added_);
-    DCHECK(active_download_item_ == NULL);
-  } else if (download->IsComplete()) {
-    OnConfigFileDownloaded();
-  }
-}
-
-void BurnManager::OnConfigFileDownloaded() {
-  BrowserThread::PostBlockingPoolTask(
-      FROM_HERE,
-      base::Bind(ReadFile,
-                 config_file_path_,
-                 base::Bind(&BurnManager::ConfigFileFetched,
-                            weak_ptr_factory_.GetWeakPtr())));
-}
-
-void BurnManager::ModelChanged(DownloadManager* manager) {
-  DCHECK_EQ(download_manager_, manager);
-
-  std::vector<DownloadItem*> downloads;
-  download_manager_->GetTemporaryDownloads(GetImageDir(), &downloads);
-  if (download_item_observer_added_)
-    return;
-  for (std::vector<DownloadItem*>::const_iterator it = downloads.begin();
-      it != downloads.end();
-      ++it) {
-    if ((*it)->GetURL() == config_file_url_) {
-      download_item_observer_added_ = true;
-      (*it)->AddObserver(this);
-      active_download_item_ = *it;
-      break;
-    }
-  }
-}
-
-void BurnManager::OnBurnDownloadStarted(bool success) {
-  if (!success)
-    ConfigFileFetched(false, "");
-}
-
 void BurnManager::CreateImageDir(Delegate* delegate) {
   if (image_dir_.empty()) {
     CHECK(PathService::Get(chrome::DIR_DEFAULT_DOWNLOADS, &image_dir_));
@@ -343,39 +281,38 @@ const FilePath& BurnManager::GetImageDir() {
   return image_dir_;
 }
 
-void BurnManager::FetchConfigFile(WebContents* web_contents,
-                                  Delegate* delegate) {
-  if (config_file_fetched_) {
+void BurnManager::FetchConfigFile(Delegate* delegate) {
+  if (config_file_fetched()) {
     delegate->OnConfigFileFetched(config_file_, true);
     return;
   }
   downloaders_.push_back(delegate->AsWeakPtr());
 
-  if (config_file_requested_)
+  if (config_fetcher_.get())
     return;
-  config_file_requested_ = true;
 
-  config_file_path_ = GetImageDir().Append(kConfigFileName);
-  download_manager_ = web_contents->GetBrowserContext()->GetDownloadManager();
-  download_manager_->AddObserver(this);
-  downloader()->AddListener(this, config_file_url_);
-  downloader()->DownloadFile(config_file_url_, config_file_path_, web_contents);
+  config_fetcher_.reset(content::URLFetcher::Create(
+      config_file_url_, content::URLFetcher::GET, this));
+  config_fetcher_->StartWithRequestContextGetter(
+      g_browser_process->system_request_context());
+}
+
+void BurnManager::OnURLFetchComplete(const content::URLFetcher* source) {
+  if (source == config_fetcher_.get()) {
+    std::string data;
+    const bool success =
+        source->GetStatus().status() == net::URLRequestStatus::SUCCESS;
+    if (success)
+      config_fetcher_->GetResponseAsString(&data);
+    config_fetcher_.reset();
+    ConfigFileFetched(success, data);
+  }
 }
 
 void BurnManager::ConfigFileFetched(bool fetched, const std::string& content) {
-  if (config_file_fetched_)
+  if (config_file_fetched())
     return;
 
-  if (active_download_item_) {
-    active_download_item_->RemoveObserver(this);
-    active_download_item_ = NULL;
-  }
-  download_item_observer_added_ = false;
-  if (download_manager_)
-    download_manager_->RemoveObserver(this);
-
-  config_file_fetched_ = fetched;
-
   if (fetched) {
     config_file_.reset(content);
   } else {
diff --git a/chrome/browser/chromeos/imageburner/burn_manager.h b/chrome/browser/chromeos/imageburner/burn_manager.h
index d28a1f16..c13c35d 100644
--- a/chrome/browser/chromeos/imageburner/burn_manager.h
+++ b/chrome/browser/chromeos/imageburner/burn_manager.h
@@ -12,11 +12,18 @@
 #include <vector>
 
 #include "base/file_path.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
-#include "content/public/browser/download_item.h"
-#include "content/public/browser/download_manager.h"
+#include "content/public/common/url_fetcher_delegate.h"
 #include "googleurl/src/gurl.h"
-#include "net/base/file_stream.h"
+
+namespace content {
+class WebContents;
+}
+
+namespace net {
+class FileStream;
+}
 
 namespace chromeos {
 namespace imageburner {
@@ -197,10 +204,7 @@ class StateMachine {
   DISALLOW_COPY_AND_ASSIGN(StateMachine);
 };
 
-class BurnManager
-    : public content::DownloadManager::Observer,
-      public content::DownloadItem::Observer,
-      public Downloader::Listener {
+class BurnManager : content::URLFetcherDelegate {
  public:
 
   class Delegate : public base::SupportsWeakPtr<Delegate> {
@@ -220,20 +224,12 @@ class BurnManager
   // Initialize() should already have been called.
   static BurnManager* GetInstance();
 
-  // content::DownloadItem::Observer interface.
-  virtual void OnDownloadUpdated(content::DownloadItem* download) OVERRIDE;
-  virtual void OnDownloadOpened(content::DownloadItem* download) OVERRIDE {}
-
-  // content::DownloadManager::Observer interface.
-  virtual void ModelChanged(content::DownloadManager* manager) OVERRIDE;
-
-  // Downloader::Listener interface.
-  virtual void OnBurnDownloadStarted(bool success) OVERRIDE;
-
   // Creates URL image should be fetched from.
   // Must be called from UI thread.
-  void FetchConfigFile(content::WebContents* web_content,
-                       Delegate* delegate);
+  void FetchConfigFile(Delegate* delegate);
+
+  // URLFetcherDelegate override.
+  virtual void OnURLFetchComplete(const content::URLFetcher* source) OVERRIDE;
 
   // Creates directory image will be downloaded to.
   // Must be called from FILE thread.
@@ -271,29 +267,24 @@ class BurnManager
   virtual ~BurnManager();
 
   void OnImageDirCreated(Delegate* delegate, bool success);
-  void OnConfigFileDownloaded();
   void ConfigFileFetched(bool fetched, const std::string& content);
 
+  bool config_file_fetched() const { return !config_file_.empty(); }
+
   base::WeakPtrFactory<BurnManager> weak_ptr_factory_;
 
   FilePath image_dir_;
   FilePath target_device_path_;
   FilePath target_file_path_;
-  FilePath config_file_path_;
-
-  content::DownloadManager* download_manager_;
-  bool download_item_observer_added_;
-  content::DownloadItem*  active_download_item_;
 
   ConfigFile config_file_;
   GURL config_file_url_;
-  bool config_file_requested_;
-  bool config_file_fetched_;
   std::vector<base::WeakPtr<Delegate> > downloaders_;
 
   scoped_ptr<StateMachine> state_machine_;
 
   scoped_ptr<Downloader> downloader_;
+  scoped_ptr<content::URLFetcher> config_fetcher_;
 
   DISALLOW_COPY_AND_ASSIGN(BurnManager);
 };