src/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_frame_host.h"
  16 #include "content/public/browser/render_view_host.h"
  17 #include "content/public/browser/web_contents.h"
  18
  19 using content::RenderFrameHost;
  20 using content::RenderViewHost;
  21 using content::WebContents;
  22
  23 DEFINE_WEB_CONTENTS_USER_DATA_KEY(AlternateErrorPageTabObserver);
  24
  25 AlternateErrorPageTabObserver::AlternateErrorPageTabObserver(
  26     WebContents* web_contents)
  27     : content::WebContentsObserver(web_contents),
  28       profile_(Profile::FromBrowserContext(web_contents->GetBrowserContext())) {
  29   PrefService* prefs = profile_->GetPrefs();
  30   if (prefs) {
  31     pref_change_registrar_.Init(prefs);
  32     pref_change_registrar_.Add(
  33         prefs::kAlternateErrorPagesEnabled,
  34         base::Bind(&AlternateErrorPageTabObserver::
  35                        OnAlternateErrorPagesEnabledChanged,
  36                    base::Unretained(this)));
  37   }
  38
  39   registrar_.Add(this, chrome::NOTIFICATION_GOOGLE_URL_UPDATED,
  40                  content::Source<Profile>(profile_->GetOriginalProfile()));
  41 }
  42
  43 AlternateErrorPageTabObserver::~AlternateErrorPageTabObserver() {
  44 }
  45
  46 // static
  47 void AlternateErrorPageTabObserver::RegisterProfilePrefs(
  48     user_prefs::PrefRegistrySyncable* prefs) {
  49   prefs->RegisterBooleanPref(prefs::kAlternateErrorPagesEnabled,
  50                              true,
  51                              user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
  52 }
  53
  54 ////////////////////////////////////////////////////////////////////////////////
  55 // WebContentsObserver overrides
  56
  57 void AlternateErrorPageTabObserver::RenderViewCreated(
  58     RenderViewHost* render_view_host) {
  59   UpdateAlternateErrorPageURL(render_view_host);
  60 }
  61
  62 ////////////////////////////////////////////////////////////////////////////////
  63 // content::NotificationObserver overrides
  64
  65 void AlternateErrorPageTabObserver::Observe(
  66     int type,
  67     const content::NotificationSource& source,
  68     const content::NotificationDetails& details) {
  69   DCHECK_EQ(chrome::NOTIFICATION_GOOGLE_URL_UPDATED, type);
  70   UpdateAlternateErrorPageURL(web_contents()->GetRenderViewHost());
  71 }
  72
  73 ////////////////////////////////////////////////////////////////////////////////
  74 // Internal helpers
  75
  76 GURL AlternateErrorPageTabObserver::GetAlternateErrorPageURL() const {
  77   GURL url;
  78   // Disable alternate error pages when in Incognito mode.
  79   if (profile_->IsOffTheRecord())
  80     return url;
  81
  82   if (profile_->GetPrefs()->GetBoolean(prefs::kAlternateErrorPagesEnabled)) {
  83     url = google_util::LinkDoctorBaseURL();
  84     if (!url.is_valid())
  85       return url;
  86     url = google_util::AppendGoogleLocaleParam(url);
  87     url = google_util::AppendGoogleTLDParam(profile_, url);
  88   }
  89   return url;
  90 }
  91
  92 void AlternateErrorPageTabObserver::OnAlternateErrorPagesEnabledChanged() {
  93   UpdateAlternateErrorPageURL(web_contents()->GetRenderViewHost());
  94 }
  95
  96 void AlternateErrorPageTabObserver::UpdateAlternateErrorPageURL(
  97     RenderViewHost* rvh) {
  98   RenderFrameHost* rfh = rvh->GetMainFrame();
  99   rfh->Send(new ChromeViewMsg_SetAltErrorPageURL(
 100                 rfh->GetRoutingID(), GetAlternateErrorPageURL()));
 101 }