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chrome/browser/ui/alternate_error_tab_observer.cc

-// Copyright (c) 2012 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.
-
-#include "chrome/browser/ui/alternate_error_tab_observer.h"
-
-#include "base/prefs/pref_service.h"
-#include "chrome/browser/chrome_notification_types.h"
-#include "chrome/browser/google/google_util.h"
-#include "chrome/browser/profiles/profile.h"
-#include "chrome/common/pref_names.h"
-#include "chrome/common/render_messages.h"
-#include "components/user_prefs/pref_registry_syncable.h"
-#include "content/public/browser/notification_service.h"
-#include "content/public/browser/render_frame_host.h"
-#include "content/public/browser/render_view_host.h"
-#include "content/public/browser/web_contents.h"
-
-using content::RenderFrameHost;
-using content::RenderViewHost;
-using content::WebContents;
-
-DEFINE_WEB_CONTENTS_USER_DATA_KEY(AlternateErrorPageTabObserver);
-
-AlternateErrorPageTabObserver::AlternateErrorPageTabObserver(
-    WebContents* web_contents)
-    : content::WebContentsObserver(web_contents),
-      profile_(Profile::FromBrowserContext(web_contents->GetBrowserContext())) {
-  PrefService* prefs = profile_->GetPrefs();
-  if (prefs) {
-    pref_change_registrar_.Init(prefs);
-    pref_change_registrar_.Add(
-        prefs::kAlternateErrorPagesEnabled,
-        base::Bind(&AlternateErrorPageTabObserver::
-                       OnAlternateErrorPagesEnabledChanged,
-                   base::Unretained(this)));
-  }
-
-  registrar_.Add(this, chrome::NOTIFICATION_GOOGLE_URL_UPDATED,
-                 content::Source<Profile>(profile_->GetOriginalProfile()));
-}
-
-AlternateErrorPageTabObserver::~AlternateErrorPageTabObserver() {
-}
-
-// static
-void AlternateErrorPageTabObserver::RegisterProfilePrefs(
-    user_prefs::PrefRegistrySyncable* prefs) {
-  prefs->RegisterBooleanPref(prefs::kAlternateErrorPagesEnabled,
-                             true,
-                             user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// WebContentsObserver overrides
-
-void AlternateErrorPageTabObserver::RenderViewCreated(
-    RenderViewHost* render_view_host) {
-  UpdateAlternateErrorPageURL(render_view_host);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// content::NotificationObserver overrides
-
-void AlternateErrorPageTabObserver::Observe(
-    int type,
-    const content::NotificationSource& source,
-    const content::NotificationDetails& details) {
-  DCHECK_EQ(chrome::NOTIFICATION_GOOGLE_URL_UPDATED, type);
-  UpdateAlternateErrorPageURL(web_contents()->GetRenderViewHost());
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// Internal helpers
-
-GURL AlternateErrorPageTabObserver::GetAlternateErrorPageURL() const {
-  GURL url;
-  // Disable alternate error pages when in Incognito mode.
-  if (profile_->IsOffTheRecord())
-    return url;
-
-  if (profile_->GetPrefs()->GetBoolean(prefs::kAlternateErrorPagesEnabled)) {
-    url = google_util::LinkDoctorBaseURL();
-    if (!url.is_valid())
-      return url;
-    url = google_util::AppendGoogleLocaleParam(url);
-    url = google_util::AppendGoogleTLDParam(profile_, url);
-  }
-  return url;
-}
-
-void AlternateErrorPageTabObserver::OnAlternateErrorPagesEnabledChanged() {
-  UpdateAlternateErrorPageURL(web_contents()->GetRenderViewHost());
-}
-
-void AlternateErrorPageTabObserver::UpdateAlternateErrorPageURL(
-    RenderViewHost* rvh) {
-  RenderFrameHost* rfh = rvh->GetMainFrame();
-  rfh->Send(new ChromeViewMsg_SetAltErrorPageURL(
-                rfh->GetRoutingID(), GetAlternateErrorPageURL()));
-}