[cros] Captcha support for blocking UI.

BUG=chromium-os:9812
TEST=Manual.

Review URL: http://codereview.chromium.org/5708001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@69293 0039d316-1c4b-4281-b951-d872f2087c98

8 files changed, 256 insertions, 31 deletions

diff --git a/chrome/browser/chromeos/login/captcha_view.cc b/chrome/browser/chromeos/login/captcha_view.cc
index 7c55cae..de66b3e 100644
--- a/chrome/browser/chromeos/login/captcha_view.cc
+++ b/chrome/browser/chromeos/login/captcha_view.cc
@@ -7,10 +7,16 @@
 #include "app/l10n_util.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
+#include "chrome/browser/chromeos/login/helper.h"
 #include "chrome/browser/chromeos/login/image_downloader.h"
+#include "chrome/browser/chromeos/login/rounded_rect_painter.h"
+#include "chrome/browser/chromeos/login/textfield_with_margin.h"
+#include "chrome/browser/chromeos/views/copy_background.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "grit/locale_settings.h"
+#include "views/background.h"
+#include "views/controls/button/text_button.h"
 #include "views/controls/image_view.h"
 #include "views/controls/label.h"
 #include "views/grid_layout.h"
@@ -24,11 +30,57 @@ using views::WidgetGtk;
 
 namespace chromeos {
 
-CaptchaView::CaptchaView(const GURL& captcha_url)
+namespace {
+
+// A Textfield for captcha input, which also sets focus to itself
+// when a mouse is clicked on it. This is necessary in screen locker mode
+// as mouse events are grabbed in the screen locker.
+class CaptchaField : public TextfieldWithMargin {
+ public:
+  CaptchaField()
+      : TextfieldWithMargin() {
+  }
+
+  // views::View overrides.
+  virtual bool OnMousePressed(const views::MouseEvent& e) {
+    RequestFocus();
+    return false;
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(CaptchaField);
+};
+
+class WideTextButton : public views::TextButton {
+ public:
+  WideTextButton(views::ButtonListener* listener, const std::wstring& text)
+      : TextButton(listener, text) {
+    SetFont(font().DeriveFont(kFontSizeCorrectionDelta));
+  }
+
+  virtual ~WideTextButton() {}
+
+ private:
+  virtual gfx::Size GetPreferredSize() {
+    gfx::Size preferred_size = TextButton::GetPreferredSize();
+    // Set minimal width.
+    if (preferred_size.width() < login::kButtonMinWidth)
+      preferred_size.set_width(login::kButtonMinWidth);
+    return preferred_size;
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(WideTextButton);
+};
+
+}  // namespace
+
+CaptchaView::CaptchaView(const GURL& captcha_url, bool is_standalone)
     : delegate_(NULL),
       captcha_url_(captcha_url),
       captcha_image_(NULL),
-      captcha_textfield_(NULL) {
+      captcha_textfield_(NULL),
+      is_standalone_(is_standalone),
+      ok_button_(NULL) {
 }
 
 bool CaptchaView::Accept() {
@@ -41,38 +93,67 @@ std::wstring CaptchaView::GetWindowTitle() const {
   return l10n_util::GetString(IDS_LOGIN_CAPTCHA_DIALOG_TITLE);
 }
 
+void CaptchaView::SetCaptchaURL(const GURL& captcha_url) {
+  captcha_url_ = captcha_url;
+  captcha_textfield_->SetText(string16());
+  // ImageDownloader will delete itself once URL is fetched.
+  // TODO(nkostylev): Make sure that it works after view is deleted.
+  new ImageDownloader(this, GURL(captcha_url_), std::string());
+}
+
 gfx::Size CaptchaView::GetPreferredSize() {
   // TODO(nkostylev): Once UI is finalized, create locale settings.
-  return gfx::Size(views::Window::GetLocalizedContentsSize(
+  gfx::Size size = gfx::Size(views::Window::GetLocalizedContentsSize(
       IDS_CAPTCHA_INPUT_DIALOG_WIDTH_CHARS,
       IDS_CAPTCHA_INPUT_DIALOG_HEIGHT_LINES));
+  if (is_standalone_)
+    size.set_height(size.height() + ok_button_->GetPreferredSize().height());
+
+  return size;
 }
 
 void CaptchaView::ViewHierarchyChanged(bool is_add,
                                        views::View* parent,
                                        views::View* child) {
-  // Can't init before we're inserted into a Container, because we require
-  // a HWND to parent native child controls to.
+  // Can't focus before we're inserted into a Container.
   if (is_add && child == this)
-    Init();
+    captcha_textfield_->RequestFocus();
 }
 
 bool CaptchaView::HandleKeystroke(views::Textfield* sender,
     const views::Textfield::Keystroke& keystroke) {
   if (sender == captcha_textfield_ &&
       keystroke.GetKeyboardCode() == app::VKEY_RETURN) {
-    GetDialogClientView()->AcceptWindow();
+    if (is_standalone_) {
+      Accept();
+    } else {
+      GetDialogClientView()->AcceptWindow();
+    }
   }
   return false;
 }
 
 void CaptchaView::OnImageDecoded(const SkBitmap& decoded_image) {
   captcha_image_->SetImage(decoded_image);
-  SchedulePaint();
+  captcha_textfield_->RequestFocus();
   Layout();
 }
 
+void CaptchaView::ButtonPressed(views::Button* sender,
+                                const views::Event& event) {
+  DCHECK(sender == ok_button_);
+  Accept();
+}
+
 void CaptchaView::Init() {
+  if (is_standalone_) {
+    // Use rounded rect background.
+    set_border(CreateWizardBorder(&BorderDefinition::kUserBorder));
+    views::Painter* painter = CreateWizardPainter(
+        &BorderDefinition::kUserBorder);
+    set_background(views::Background::CreateBackgroundPainter(true, painter));
+  }
+
   views::GridLayout* layout = CreatePanelGridLayout(this);
   SetLayoutManager(layout);
 
@@ -93,9 +174,10 @@ void CaptchaView::Init() {
   layout->AddPaddingRow(0, kRelatedControlVerticalSpacing);
 
   layout->StartRow(0, column_view_set_id);
-  captcha_textfield_ = new views::Textfield(
-      views::Textfield::STYLE_DEFAULT);
+  captcha_textfield_ = new CaptchaField();
   captcha_textfield_->SetController(this);
+  if (is_standalone_)
+    captcha_textfield_->set_background(new CopyBackground(this));
   layout->AddView(captcha_textfield_);
   layout->AddPaddingRow(0, kRelatedControlVerticalSpacing);
 
@@ -106,9 +188,22 @@ void CaptchaView::Init() {
   layout->AddView(label);
   layout->AddPaddingRow(0, kRelatedControlVerticalSpacing);
 
-  captcha_textfield_->RequestFocus();
+  if (is_standalone_) {
+    layout->StartRow(0, column_view_set_id);
+    ok_button_ = new WideTextButton(this, l10n_util::GetString(IDS_OK));
+    ok_button_->set_alignment(views::TextButton::ALIGN_CENTER);
+    ok_button_->SetFocusable(true);
+    ok_button_->SetNormalHasBorder(true);
+    ok_button_->set_animate_on_state_change(false);
+    ok_button_->SetEnabledColor(SK_ColorBLACK);
+    ok_button_->SetHighlightColor(SK_ColorBLACK);
+    ok_button_->SetHoverColor(SK_ColorBLACK);
+    layout->AddView(ok_button_, 1, 1,
+                    views::GridLayout::CENTER, views::GridLayout::CENTER);
+  }
 
-  // ImageDownloader will disable itself once URL is fetched.
+  // ImageDownloader will delete itself once URL is fetched.
+  // TODO(nkostylev): Make sure that it works after view is deleted.
   new ImageDownloader(this, GURL(captcha_url_), std::string());
 }
 
diff --git a/chrome/browser/chromeos/login/captcha_view.h b/chrome/browser/chromeos/login/captcha_view.h
index 491c438..37de9f94b 100644
--- a/chrome/browser/chromeos/login/captcha_view.h
+++ b/chrome/browser/chromeos/login/captcha_view.h
@@ -10,11 +10,13 @@
 
 #include "chrome/browser/chromeos/login/image_decoder.h"
 #include "googleurl/src/gurl.h"
+#include "views/controls/button/button.h"
 #include "views/controls/textfield/textfield.h"
 #include "views/window/dialog_delegate.h"
 
 namespace views {
 class ImageView;
+class TextButton;
 class View;
 class Window;
 }  // namespace views
@@ -25,7 +27,8 @@ namespace chromeos {
 class CaptchaView : public views::View,
                     public views::DialogDelegate,
                     public views::Textfield::Controller,
-                    public ImageDecoder::Delegate {
+                    public ImageDecoder::Delegate,
+                    public views::ButtonListener {
  public:
   class Delegate {
    public:
@@ -37,7 +40,8 @@ class CaptchaView : public views::View,
   };
 
   // |captcha_url| represents CAPTCHA image URL.
-  explicit CaptchaView(const GURL& captcha_url);
+  // |is_standalone| is true when CaptchaView is not presented as dialog.
+  CaptchaView(const GURL& captcha_url, bool is_standalone);
   virtual ~CaptchaView() {}
 
   // views::DialogDelegate overrides:
@@ -59,10 +63,20 @@ class CaptchaView : public views::View,
   // Overriden from ImageDownloader::Delegate:
   virtual void OnImageDecoded(const SkBitmap& decoded_image);
 
+  // Overridden from views::ButtonListener.
+  virtual void ButtonPressed(views::Button* sender, const views::Event& event);
+
+  // Initializes UI.
+  void Init();
+
   void set_delegate(Delegate* delegate) {
     delegate_ = delegate;
   }
 
+  // Instructs to download and display another captcha image.
+  // Is used when same CaptchaView is reused.
+  void SetCaptchaURL(const GURL& captcha_url);
+
  protected:
   // views::View overrides:
   virtual gfx::Size GetPreferredSize();
@@ -71,14 +85,18 @@ class CaptchaView : public views::View,
                                     views::View* child);
 
  private:
-  // Initializes UI.
-  void Init();
-
   Delegate* delegate_;
   GURL captcha_url_;
   views::ImageView* captcha_image_;
   views::Textfield* captcha_textfield_;
 
+  // True when view is not hosted inside dialog,
+  // thus should draw OK button/background.
+  bool is_standalone_;
+
+  // Used in standalone mode.
+  views::TextButton* ok_button_;
+
   DISALLOW_COPY_AND_ASSIGN(CaptchaView);
 };
 
diff --git a/chrome/browser/chromeos/login/existing_user_controller.cc b/chrome/browser/chromeos/login/existing_user_controller.cc
index 501831f..83aa156 100644
--- a/chrome/browser/chromeos/login/existing_user_controller.cc
+++ b/chrome/browser/chromeos/login/existing_user_controller.cc
@@ -413,7 +413,8 @@ void ExistingUserController::OnLoginFailure(const LoginFailure& failure) {
         failure.error().state() == GoogleServiceAuthError::CAPTCHA_REQUIRED) {
       if (!failure.error().captcha().image_url.is_empty()) {
         CaptchaView* view =
-            new CaptchaView(failure.error().captcha().image_url);
+            new CaptchaView(failure.error().captcha().image_url, false);
+        view->Init();
         view->set_delegate(this);
         views::Window* window = browser::CreateViewsWindow(
             GetNativeWindow(), gfx::Rect(), view);
diff --git a/chrome/browser/chromeos/login/helper.cc b/chrome/browser/chromeos/login/helper.cc
index 188a3ce..2cfc600 100644
--- a/chrome/browser/chromeos/login/helper.cc
+++ b/chrome/browser/chromeos/login/helper.cc
@@ -169,9 +169,6 @@ GURL GetAccountRecoveryHelpUrl() {
 
 namespace login {
 
-// Minimal width for the button.
-const int kButtonMinWidth = 90;
-
 gfx::Size WideButton::GetPreferredSize() {
   gfx::Size preferred_size = NativeButton::GetPreferredSize();
   // Set minimal width.
diff --git a/chrome/browser/chromeos/login/helper.h b/chrome/browser/chromeos/login/helper.h
index 1c3851a..b613032 100644
--- a/chrome/browser/chromeos/login/helper.h
+++ b/chrome/browser/chromeos/login/helper.h
@@ -133,6 +133,9 @@ const int kUserCornerRadius = 6;
 const int kSelectedLabelHeight = 25;
 const int kUnselectedLabelHeight = 20;
 
+// Minimal width for the button.
+const int kButtonMinWidth = 90;
+
 class WideButton : public views::NativeButton {
  public:
   WideButton(views::ButtonListener* listener, const std::wstring& text)
diff --git a/chrome/browser/chromeos/login/login_performer.cc b/chrome/browser/chromeos/login/login_performer.cc
index d1b2281..02e7b46 100644
--- a/chrome/browser/chromeos/login/login_performer.cc
+++ b/chrome/browser/chromeos/login/login_performer.cc
@@ -393,10 +393,11 @@ void LoginPerformer::ResolveLockNetworkAuthFailure() {
       break;
     case GoogleServiceAuthError::CAPTCHA_REQUIRED:
       // User is requested to enter CAPTCHA challenge.
-      msg = l10n_util::GetString(IDS_LOGIN_ERROR_AUTHENTICATING);
-      // TODO(nkostylev): Instruct ScreenLocker to show CAPTCHA input.
-      // http://crosbug.com/9812
-      break;
+      msg = l10n_util::GetString(IDS_LOGIN_ERROR_PASSWORD_CHANGED);
+      ScreenLocker::default_screen_locker()->ShowCaptchaAndErrorMessage(
+          last_login_failure_.error().captcha().image_url,
+          msg);
+      return;
     default:
       // Unless there's new GoogleServiceAuthError state has been added.
       NOTREACHED();
diff --git a/chrome/browser/chromeos/login/screen_locker.cc b/chrome/browser/chromeos/login/screen_locker.cc
index 329a5fc..29730a1 100644
--- a/chrome/browser/chromeos/login/screen_locker.cc
+++ b/chrome/browser/chromeos/login/screen_locker.cc
@@ -249,7 +249,9 @@ class LockWindow : public views::WidgetGtk {
 
 // GrabWidget's root view to layout the ScreenLockView at the center
 // and the Shutdown button at the right bottom.
-class GrabWidgetRootView : public views::View {
+class GrabWidgetRootView
+    : public views::View,
+      public chromeos::ScreenLocker::ScreenLockViewContainer {
  public:
   explicit GrabWidgetRootView(chromeos::ScreenLockView* screen_lock_view)
       : screen_lock_view_(screen_lock_view),
@@ -266,6 +268,18 @@ class GrabWidgetRootView : public views::View {
     shutdown_button_->LayoutIn(this);
   }
 
+  // ScreenLocker::ScreenLockViewContainer implementation:
+  void SetScreenLockView(views::View* screen_lock_view) {
+    if (screen_lock_view_) {
+      RemoveChildView(screen_lock_view_);
+    }
+    screen_lock_view_ =  screen_lock_view;
+    if (screen_lock_view_) {
+      AddChildView(0, screen_lock_view_);
+    }
+    Layout();
+  }
+
  private:
   views::View* screen_lock_view_;
 
@@ -435,7 +449,9 @@ void GrabWidget::TryUngrabOtherClients() {
 
 // BackgroundView for ScreenLocker, which layouts a lock widget in
 // addition to other background components.
-class ScreenLockerBackgroundView : public chromeos::BackgroundView {
+class ScreenLockerBackgroundView
+    : public chromeos::BackgroundView,
+      public chromeos::ScreenLocker::ScreenLockViewContainer {
  public:
   ScreenLockerBackgroundView(views::WidgetGtk* lock_widget,
                              views::View* screen_lock_view)
@@ -463,6 +479,12 @@ class ScreenLockerBackgroundView : public chromeos::BackgroundView {
     }
   }
 
+  // ScreenLocker::ScreenLockViewContainer implementation:
+  void SetScreenLockView(views::View* screen_lock_view) {
+    screen_lock_view_ =  screen_lock_view;
+    Layout();
+  }
+
  private:
   views::WidgetGtk* lock_widget_;
 
@@ -617,6 +639,9 @@ ScreenLocker::ScreenLocker(const UserManager::User& user)
     : lock_window_(NULL),
       lock_widget_(NULL),
       screen_lock_view_(NULL),
+      captcha_view_(NULL),
+      grab_container_(NULL),
+      background_container_(NULL),
       user_(user),
       error_info_(NULL),
       drawn_(false),
@@ -663,8 +688,9 @@ void ScreenLocker::Init() {
   lock_widget_->MakeTransparent();
   lock_widget_->InitWithWidget(lock_window_, gfx::Rect());
   if (screen_lock_view_) {
-    lock_widget_->SetContentsView(
-        new GrabWidgetRootView(screen_lock_view_));
+    GrabWidgetRootView* root_view = new GrabWidgetRootView(screen_lock_view_);
+    grab_container_ = root_view;
+    lock_widget_->SetContentsView(root_view);
   }
   lock_widget_->Show();
 
@@ -672,8 +698,10 @@ void ScreenLocker::Init() {
   std::string url_string =
       CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
           switches::kScreenSaverUrl);
-  background_view_ = new ScreenLockerBackgroundView(lock_widget_,
-                                                    screen_lock_view_);
+  ScreenLockerBackgroundView* screen_lock_background_view_ =
+      new ScreenLockerBackgroundView(lock_widget_, screen_lock_view_);
+  background_container_ = screen_lock_background_view_;
+  background_view_ = screen_lock_background_view_;
   background_view_->Init(GURL(url_string));
   if (background_view_->ScreenSaverEnabled())
     StartScreenSaver();
@@ -781,6 +809,29 @@ void ScreenLocker::InfoBubbleClosing(InfoBubble* info_bubble,
   }
 }
 
+void ScreenLocker::OnCaptchaEntered(const std::string& captcha) {
+  // Captcha dialog is only shown when LoginPerformer instance exists,
+  // i.e. blocking UI after password change is in place.
+  DCHECK(LoginPerformer::default_performer());
+  LoginPerformer::default_performer()->set_captcha(captcha);
+
+  // ScreenLockView ownership is passed to grab_container_.
+  // Need to save return value here so that compile
+  // doesn't fail with "unused result" warning.
+  views::View* view = secondary_view_.release();
+  view = NULL;
+  captcha_view_->SetVisible(false);
+  grab_container_->SetScreenLockView(screen_lock_view_);
+  background_container_->SetScreenLockView(screen_lock_view_);
+  screen_lock_view_->SetVisible(true);
+  screen_lock_view_->ClearAndSetFocusToPassword();
+
+  // Take CaptchaView ownership now that it's removed from grab_container_.
+  secondary_view_.reset(captcha_view_);
+  ShowErrorMessage(postponed_error_message_, false);
+  postponed_error_message_.clear();
+}
+
 void ScreenLocker::Authenticate(const string16& password) {
   authentication_start_time_ = base::Time::Now();
   screen_lock_view_->SetEnabled(false);
@@ -830,6 +881,27 @@ void ScreenLocker::Signout() {
   }
 }
 
+void ScreenLocker::ShowCaptchaAndErrorMessage(const GURL& captcha_url,
+                                              const std::wstring& message) {
+  postponed_error_message_ = message;
+  if (captcha_view_) {
+    captcha_view_->SetCaptchaURL(captcha_url);
+  } else {
+    captcha_view_ = new CaptchaView(captcha_url, true);
+    captcha_view_->Init();
+    captcha_view_->set_delegate(this);
+  }
+  // CaptchaView ownership is passed to grab_container_.
+  views::View* view = secondary_view_.release();
+  view = NULL;
+  screen_lock_view_->SetVisible(false);
+  grab_container_->SetScreenLockView(captcha_view_);
+  background_container_->SetScreenLockView(captcha_view_);
+  captcha_view_->SetVisible(true);
+  // Take ScreenLockView ownership now that it's removed from grab_container_.
+  secondary_view_.reset(screen_lock_view_);
+}
+
 void ScreenLocker::ShowErrorMessage(const std::wstring& message,
                                     bool sign_out_only) {
   if (sign_out_only) {
diff --git a/chrome/browser/chromeos/login/screen_locker.h b/chrome/browser/chromeos/login/screen_locker.h
index 27e1404..a0332cf 100644
--- a/chrome/browser/chromeos/login/screen_locker.h
+++ b/chrome/browser/chromeos/login/screen_locker.h
@@ -8,8 +8,10 @@
 
 #include <string>
 
+#include "base/scoped_ptr.h"
 #include "base/task.h"
 #include "base/time.h"
+#include "chrome/browser/chromeos/login/captcha_view.h"
 #include "chrome/browser/chromeos/login/login_status_consumer.h"
 #include "chrome/browser/chromeos/login/message_bubble.h"
 #include "chrome/browser/chromeos/login/user_manager.h"
@@ -20,6 +22,7 @@ class Rect;
 }  // namespace gfx
 
 namespace views {
+class View;
 class WidgetGtk;
 }  // namespace views
 
@@ -43,8 +46,18 @@ class ScreenLockerTester;
 // delete itself when it's unlocked.
 class ScreenLocker : public LoginStatusConsumer,
                      public MessageBubbleDelegate,
+                     public CaptchaView::Delegate,
                      public views::AcceleratorTarget {
  public:
+  // Interface that helps switching from ScreenLockView to CaptchaView.
+  class ScreenLockViewContainer {
+   public:
+    virtual void SetScreenLockView(views::View* screen_lock_view) = 0;
+
+   protected:
+    virtual ~ScreenLockViewContainer() {}
+  };
+
   explicit ScreenLocker(const UserManager::User& user);
 
   // Returns the default instance if it has been created.
@@ -69,6 +82,9 @@ class ScreenLocker : public LoginStatusConsumer,
   virtual bool FadeInOnShow() { return false; }
   virtual void OnHelpLinkActivated() {}
 
+  // CaptchaView::Delegate implementation:
+  virtual void OnCaptchaEntered(const std::string& captcha);
+
   // Authenticates the user with given |password| and authenticator.
   void Authenticate(const string16& password);
 
@@ -81,6 +97,11 @@ class ScreenLocker : public LoginStatusConsumer,
   // Exit the chrome, which will sign out the current session.
   void Signout();
 
+  // Present user a CAPTCHA challenge with image from |captcha_url|,
+  // After that shows error bubble with |message|.
+  void ShowCaptchaAndErrorMessage(const GURL& captcha_url,
+                                  const std::wstring& message);
+
   // Disables all UI needed and shows error bubble with |message|.
   // If |sign_out_only| is true then all other input except "Sign Out"
   // button is blocked.
@@ -156,6 +177,23 @@ class ScreenLocker : public LoginStatusConsumer,
   // A view that can display html page as background.
   BackgroundView* background_view_;
 
+  // View used to present CAPTCHA challenge input.
+  CaptchaView* captcha_view_;
+
+  // Containers that hold currently visible view.
+  // Initially it's ScreenLockView instance.
+  // When CAPTCHA input dialog is presented it's swapped to CaptchaView
+  // instance, then back after CAPTCHA input is done.
+  ScreenLockViewContainer* grab_container_;
+  ScreenLockViewContainer* background_container_;
+
+  // View that's not owned by grab_container_ - either ScreenLockView or
+  // CaptchaView instance. Keep that under scoped_ptr so that it's deleted.
+  scoped_ptr<views::View> secondary_view_;
+
+  // Postponed error message to be shown after CAPTCHA input is done.
+  std::wstring postponed_error_message_;
+
   // Logged in user.
   UserManager::User user_;