chrome/browser/ui/alternate_error_tab_observer.cc

   1 // Copyright (c) 2012 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/ui/alternate_error_tab_observer.h"
   6
   7 #include "base/prefs/pref_service.h"
   8 #include "chrome/browser/chrome_notification_types.h"
   9 #include "chrome/browser/google/google_util.h"
  10 #include "chrome/browser/profiles/profile.h"
  11 #include "chrome/common/pref_names.h"
  12 #include "chrome/common/render_messages.h"
  13 #include "components/user_prefs/pref_registry_syncable.h"
  14 #include "content/public/browser/notification_service.h"
  15 #include "content/public/browser/render_view_host.h"
  16 #include "content/public/browser/web_contents.h"
  17
  18 using content::RenderViewHost;
  19 using content::WebContents;
  20
  21 DEFINE_WEB_CONTENTS_USER_DATA_KEY(AlternateErrorPageTabObserver);
  22
  23 AlternateErrorPageTabObserver::AlternateErrorPageTabObserver(
  24     WebContents* web_contents)
  25     : content::WebContentsObserver(web_contents),
  26       profile_(Profile::FromBrowserContext(web_contents->GetBrowserContext())) {
  27   PrefService* prefs = profile_->GetPrefs();
  28   if (prefs) {
  29     pref_change_registrar_.Init(prefs);
  30     pref_change_registrar_.Add(
  31         prefs::kAlternateErrorPagesEnabled,
  32         base::Bind(&AlternateErrorPageTabObserver::
  33                        OnAlternateErrorPagesEnabledChanged,
  34                    base::Unretained(this)));
  35   }
  36
  37   registrar_.Add(this, chrome::NOTIFICATION_GOOGLE_URL_UPDATED,
  38                  content::Source<Profile>(profile_->GetOriginalProfile()));
  39 }
  40
  41 AlternateErrorPageTabObserver::~AlternateErrorPageTabObserver() {
  42 }
  43
  44 // static
  45 void AlternateErrorPageTabObserver::RegisterProfilePrefs(
  46     user_prefs::PrefRegistrySyncable* prefs) {
  47   prefs->RegisterBooleanPref(prefs::kAlternateErrorPagesEnabled,
  48                              true,
  49                              user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
  50 }
  51
  52 ////////////////////////////////////////////////////////////////////////////////
  53 // WebContentsObserver overrides
  54
  55 void AlternateErrorPageTabObserver::RenderViewCreated(
  56     RenderViewHost* render_view_host) {
  57   UpdateAlternateErrorPageURL(render_view_host);
  58 }
  59
  60 ////////////////////////////////////////////////////////////////////////////////
  61 // content::NotificationObserver overrides
  62
  63 void AlternateErrorPageTabObserver::Observe(
  64     int type,
  65     const content::NotificationSource& source,
  66     const content::NotificationDetails& details) {
  67   DCHECK_EQ(chrome::NOTIFICATION_GOOGLE_URL_UPDATED, type);
  68   UpdateAlternateErrorPageURL(web_contents()->GetRenderViewHost());
  69 }
  70
  71 ////////////////////////////////////////////////////////////////////////////////
  72 // Internal helpers
  73
  74 GURL AlternateErrorPageTabObserver::GetAlternateErrorPageURL() const {
  75   GURL url;
  76   // Disable alternate error pages when in Incognito mode.
  77   if (profile_->IsOffTheRecord())
  78     return url;
  79
  80   if (profile_->GetPrefs()->GetBoolean(prefs::kAlternateErrorPagesEnabled)) {
  81     url = google_util::LinkDoctorBaseURL();
  82     if (!url.is_valid())
  83       return url;
  84     url = google_util::AppendGoogleLocaleParam(url);
  85     url = google_util::AppendGoogleTLDParam(profile_, url);
  86   }
  87   return url;
  88 }
  89
  90 void AlternateErrorPageTabObserver::OnAlternateErrorPagesEnabledChanged() {
  91   UpdateAlternateErrorPageURL(web_contents()->GetRenderViewHost());
  92 }
  93
  94 void AlternateErrorPageTabObserver::UpdateAlternateErrorPageURL(
  95     RenderViewHost* rvh) {
  96   rvh->Send(new ChromeViewMsg_SetAltErrorPageURL(
  97                 rvh->GetRoutingID(), GetAlternateErrorPageURL()));
  98 }