Implement the onBeforeRetarget event of the webNavigation API

chrome/browser/extensions/extension_webnavigation_api.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Implements the Chrome Extensions WebNavigation API.
 
 #include "chrome/browser/extensions/extension_webnavigation_api.h"
 
 #include "base/json/json_writer.h"
 #include "base/time.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/extension_event_router.h"
 #include "chrome/browser/extensions/extension_tabs_module.h"
 #include "chrome/browser/extensions/extension_webnavigation_api_constants.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/tab_contents/navigation_controller.h"
 #include "chrome/browser/tab_contents/provisional_load_details.h"
-#include "chrome/common/notification_type.h"
+#include "chrome/browser/tab_contents/tab_contents.h"
 #include "chrome/common/notification_service.h"
+#include "chrome/common/render_messages_params.h"
 #include "net/base/net_errors.h"
 
 namespace keys = extension_webnavigation_api_constants;
 
 namespace {
 
 // Returns 0 if the navigation happens in the main frame, or the frame ID
 // modulo 32 bits otherwise.
 int GetFrameId(ProvisionalLoadDetails* details) {
   return details->main_frame() ? 0 : static_cast<int>(details->frame_id());
@@ skipping 89 matching lines @@
     registrar_.Add(this,
                    NotificationType::FRAME_DOM_CONTENT_LOADED,
                    NotificationService::AllSources());
     registrar_.Add(this,
                    NotificationType::FRAME_DID_FINISH_LOAD,
                    NotificationService::AllSources());
     registrar_.Add(this,
                    NotificationType::FAIL_PROVISIONAL_LOAD_WITH_ERROR,
                    NotificationService::AllSources());
     registrar_.Add(this,
+                   NotificationType::CREATING_NEW_WINDOW,
+                   NotificationService::AllSources());
+    registrar_.Add(this,
                    NotificationType::TAB_CONTENTS_DESTROYED,
                    NotificationService::AllSources());
   }
 }
 
 void ExtensionWebNavigationEventRouter::Observe(
     NotificationType type,
     const NotificationSource& source,
     const NotificationDetails& details) {
   switch (type.value) {
@@ skipping 15 matching lines @@
     case NotificationType::FRAME_DID_FINISH_LOAD:
       FrameDidFinishLoad(
           Source<NavigationController>(source).ptr(),
           *Details<int64>(details).ptr());
       break;
     case NotificationType::FAIL_PROVISIONAL_LOAD_WITH_ERROR:
       FailProvisionalLoadWithError(
           Source<NavigationController>(source).ptr(),
           Details<ProvisionalLoadDetails>(details).ptr());
       break;
+    case NotificationType::CREATING_NEW_WINDOW:
+      CreatingNewWindow(
+          Source<TabContents>(source).ptr(),
+          Details<const ViewHostMsg_CreateWindow_Params>(details).ptr());
+      break;
     case NotificationType::TAB_CONTENTS_DESTROYED:
       navigation_state_.RemoveTabContentsState(
           Source<TabContents>(source).ptr());
       break;
 
     default:
       NOTREACHED();
   }
 }
 void ExtensionWebNavigationEventRouter::FrameProvisionalLoadStart(
@@ skipping 101 matching lines @@
                   std::string(net::ErrorToString(details->error_code())));
   dict->SetReal(keys::kTimeStampKey, MilliSecondsFromTime(base::Time::Now()));
   args.Append(dict);
 
   std::string json_args;
   base::JSONWriter::Write(&args, false, &json_args);
   navigation_state_.ErrorOccurredInFrame(details->frame_id());
   DispatchEvent(controller->profile(), keys::kOnErrorOccurred, json_args);
 }
 
+void ExtensionWebNavigationEventRouter::CreatingNewWindow(
+    TabContents* tab_contents,
+    const ViewHostMsg_CreateWindow_Params* details) {
+  int64 frame_id = details->opener_frame_id;
+  if (frame_id == 0 || !navigation_state_.CanSendEvents(frame_id))

[yzshen1, 2011/01/18 21:49:24]

I think it is okay to allow this notification even if
navigation_state_.CanSendEvents(frame_id) == false, since it is not part of a
navigation event sequence within the frame that frame_id refers to.

+    return;
+  ListValue args;
+  DictionaryValue* dict = new DictionaryValue();
+  dict->SetInteger(keys::kSourceTabIdKey,
+                   ExtensionTabUtil::GetTabId(tab_contents));
+  dict->SetString(keys::kSourceUrlKey, details->opener_url.spec());
+  dict->SetString(keys::kTargetUrlKey,
+                  details->target_url.possibly_invalid_spec());
+  dict->SetReal(keys::kTimeStampKey, MilliSecondsFromTime(base::Time::Now()));
+  args.Append(dict);
+
+  std::string json_args;
+  base::JSONWriter::Write(&args, false, &json_args);
+  DispatchEvent(tab_contents->profile(), keys::kOnBeforeRetarget, json_args);
+}
+
 void ExtensionWebNavigationEventRouter::DispatchEvent(
     Profile* profile,
     const char* event_name,
     const std::string& json_args) {
   if (profile && profile->GetExtensionEventRouter()) {
     profile->GetExtensionEventRouter()->DispatchEventToRenderers(
         event_name, json_args, profile, GURL());
   }
 }