1 // Copyright 2013 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/search/instant_ntp_prerenderer.h"
6
7 #include "base/basictypes.h"
8 #include "base/bind.h"
9 #include "base/message_loop/message_loop.h"
10 #include "base/prefs/pref_service.h"
11 #include "build/build_config.h"
12 #include "chrome/browser/chrome_notification_types.h"
13 #include "chrome/browser/content_settings/content_settings_provider.h"
14 #include "chrome/browser/content_settings/host_content_settings_map.h"
15 #include "chrome/browser/profiles/profile.h"
16 #include "chrome/browser/search/instant_service.h"
17 #include "chrome/browser/search/instant_service_factory.h"
18 #include "chrome/browser/search/search.h"
19 #include "chrome/browser/ui/browser.h"
20 #include "chrome/browser/ui/browser_finder.h"
21 #include "chrome/browser/ui/host_desktop.h"
22 #include "chrome/browser/ui/search/instant_ntp.h"
23 #include "chrome/browser/ui/tabs/tab_strip_model.h"
24 #include "chrome/common/content_settings.h"
25 #include "chrome/common/pref_names.h"
26 #include "chrome/common/search_urls.h"
27 #include "content/public/browser/notification_service.h"
28 #include "content/public/browser/render_process_host.h"
29 #include "content/public/browser/web_contents.h"
30 #include "net/base/network_change_notifier.h"
31
32 namespace {
33
DeleteNTPSoon(scoped_ptr<InstantNTP> ntp)34 void DeleteNTPSoon(scoped_ptr<InstantNTP> ntp) {
35 if (!ntp)
36 return;
37
38 if (ntp->contents()) {
39 base::MessageLoop::current()->DeleteSoon(
40 FROM_HERE, ntp->ReleaseContents().release());
41 }
42 base::MessageLoop::current()->DeleteSoon(FROM_HERE, ntp.release());
43 }
44
45 } // namespace
46
47
InstantNTPPrerenderer(Profile * profile,InstantService * instant_service,PrefService * prefs)48 InstantNTPPrerenderer::InstantNTPPrerenderer(Profile* profile,
49 InstantService* instant_service,
50 PrefService* prefs)
51 : profile_(profile) {
52 DCHECK(profile);
53
54 // In unit tests, prefs may be NULL.
55 if (prefs) {
56 profile_pref_registrar_.Init(prefs);
57 profile_pref_registrar_.Add(
58 prefs::kSearchSuggestEnabled,
59 base::Bind(&InstantNTPPrerenderer::ReloadInstantNTP,
60 base::Unretained(this)));
61 }
62 net::NetworkChangeNotifier::AddNetworkChangeObserver(this);
63
64 // Allow instant_service to be null for unit tets.
65 if (instant_service)
66 instant_service->AddObserver(this);
67 }
68
~InstantNTPPrerenderer()69 InstantNTPPrerenderer::~InstantNTPPrerenderer() {
70 InstantService* instant_service =
71 InstantServiceFactory::GetForProfile(profile_);
72 if (instant_service)
73 instant_service->RemoveObserver(this);
74 net::NetworkChangeNotifier::RemoveNetworkChangeObserver(this);
75 }
76
ReloadInstantNTP()77 void InstantNTPPrerenderer::ReloadInstantNTP() {
78 ResetNTP(GetInstantURL());
79 }
80
ReleaseNTPContents()81 scoped_ptr<content::WebContents> InstantNTPPrerenderer::ReleaseNTPContents() {
82 if (!profile_ || profile_->IsOffTheRecord() ||
83 !chrome::ShouldShowInstantNTP())
84 return scoped_ptr<content::WebContents>();
85
86 if (ShouldSwitchToLocalNTP())
87 ResetNTP(GetLocalInstantURL());
88
89 scoped_ptr<content::WebContents> ntp_contents = ntp_->ReleaseContents();
90
91 // Preload a new InstantNTP.
92 ReloadInstantNTP();
93 return ntp_contents.Pass();
94 }
95
GetNTPContents() const96 content::WebContents* InstantNTPPrerenderer::GetNTPContents() const {
97 return ntp() ? ntp()->contents() : NULL;
98 }
99
DeleteNTPContents()100 void InstantNTPPrerenderer::DeleteNTPContents() {
101 if (ntp_)
102 ntp_.reset();
103 }
104
RenderProcessGone()105 void InstantNTPPrerenderer::RenderProcessGone() {
106 DeleteNTPSoon(ntp_.Pass());
107 }
108
LoadCompletedMainFrame()109 void InstantNTPPrerenderer::LoadCompletedMainFrame() {
110 if (!ntp_ || ntp_->supports_instant())
111 return;
112
113 content::WebContents* ntp_contents = ntp_->contents();
114 DCHECK(ntp_contents);
115
116 InstantService* instant_service =
117 InstantServiceFactory::GetForProfile(profile());
118 if (instant_service &&
119 instant_service->IsInstantProcess(
120 ntp_contents->GetRenderProcessHost()->GetID())) {
121 return;
122 }
123 InstantSupportDetermined(ntp_contents, false);
124 }
125
GetLocalInstantURL() const126 std::string InstantNTPPrerenderer::GetLocalInstantURL() const {
127 return chrome::GetLocalInstantURL(profile_).spec();
128 }
129
GetInstantURL() const130 std::string InstantNTPPrerenderer::GetInstantURL() const {
131 if (net::NetworkChangeNotifier::IsOffline())
132 return GetLocalInstantURL();
133
134 // TODO(kmadhusu): Remove start margin param from chrome::GetInstantURL().
135 const GURL instant_url = chrome::GetInstantURL(profile_,
136 chrome::kDisableStartMargin,
137 false);
138 if (!instant_url.is_valid())
139 return GetLocalInstantURL();
140
141 return instant_url.spec();
142 }
143
IsJavascriptEnabled() const144 bool InstantNTPPrerenderer::IsJavascriptEnabled() const {
145 GURL instant_url(GetInstantURL());
146 GURL origin(instant_url.GetOrigin());
147 ContentSetting js_setting = profile_->GetHostContentSettingsMap()->
148 GetContentSetting(origin, origin, CONTENT_SETTINGS_TYPE_JAVASCRIPT,
149 NO_RESOURCE_IDENTIFIER);
150 // Javascript can be disabled either in content settings or via a WebKit
151 // preference, so check both. Disabling it through the Settings page affects
152 // content settings. I'm not sure how to disable the WebKit preference, but
153 // it's theoretically possible some users have it off.
154 bool js_content_enabled =
155 js_setting == CONTENT_SETTING_DEFAULT ||
156 js_setting == CONTENT_SETTING_ALLOW;
157 bool js_webkit_enabled = profile_->GetPrefs()->GetBoolean(
158 prefs::kWebKitJavascriptEnabled);
159 return js_content_enabled && js_webkit_enabled;
160 }
161
InStartup() const162 bool InstantNTPPrerenderer::InStartup() const {
163 #if !defined(OS_ANDROID)
164 // TODO(kmadhusu): This is not completely reliable. Find a better way to
165 // detect startup time.
166 Browser* browser = chrome::FindBrowserWithProfile(profile_,
167 chrome::GetActiveDesktop());
168 return !browser || !browser->tab_strip_model()->GetActiveWebContents();
169 #endif
170 return false;
171 }
172
ntp() const173 InstantNTP* InstantNTPPrerenderer::ntp() const {
174 return ntp_.get();
175 }
176
OnNetworkChanged(net::NetworkChangeNotifier::ConnectionType type)177 void InstantNTPPrerenderer::OnNetworkChanged(
178 net::NetworkChangeNotifier::ConnectionType type) {
179 // Not interested in events conveying change to offline.
180 if (type == net::NetworkChangeNotifier::CONNECTION_NONE)
181 return;
182
183 if (!ntp() || ntp()->IsLocal())
184 ReloadInstantNTP();
185 }
186
InstantSupportDetermined(const content::WebContents * contents,bool supports_instant)187 void InstantNTPPrerenderer::InstantSupportDetermined(
188 const content::WebContents* contents,
189 bool supports_instant) {
190 DCHECK(ntp() && ntp()->contents() == contents);
191
192 if (!supports_instant) {
193 bool is_local = ntp()->IsLocal();
194 DeleteNTPSoon(ntp_.Pass());
195 if (!is_local)
196 ResetNTP(GetLocalInstantURL());
197 }
198
199 content::NotificationService::current()->Notify(
200 chrome::NOTIFICATION_INSTANT_NTP_SUPPORT_DETERMINED,
201 content::Source<InstantNTPPrerenderer>(this),
202 content::NotificationService::NoDetails());
203 }
204
InstantPageAboutToNavigateMainFrame(const content::WebContents *,const GURL &)205 void InstantNTPPrerenderer::InstantPageAboutToNavigateMainFrame(
206 const content::WebContents* /* contents */,
207 const GURL& /* url */) {
208 NOTREACHED();
209 }
210
InstantPageLoadFailed(content::WebContents * contents)211 void InstantNTPPrerenderer::InstantPageLoadFailed(
212 content::WebContents* contents) {
213 DCHECK(ntp() && ntp()->contents() == contents);
214
215 bool is_local = ntp()->IsLocal();
216 DeleteNTPSoon(ntp_.Pass());
217 if (!is_local)
218 ResetNTP(GetLocalInstantURL());
219 }
220
ResetNTP(const std::string & instant_url)221 void InstantNTPPrerenderer::ResetNTP(const std::string& instant_url) {
222 // Instant NTP is only used in extended mode so we should always have a
223 // non-empty URL to use.
224 DCHECK(!instant_url.empty());
225 if (!chrome::ShouldUseCacheableNTP()) {
226 ntp_.reset(new InstantNTP(this, instant_url, profile_));
227 ntp_->InitContents(base::Bind(&InstantNTPPrerenderer::ReloadInstantNTP,
228 base::Unretained(this)));
229 }
230 }
231
PageIsCurrent() const232 bool InstantNTPPrerenderer::PageIsCurrent() const {
233 const std::string& instant_url = GetInstantURL();
234 if (instant_url.empty() ||
235 !search::MatchesOriginAndPath(GURL(ntp()->instant_url()),
236 GURL(instant_url)))
237 return false;
238
239 return ntp()->supports_instant();
240 }
241
ShouldSwitchToLocalNTP() const242 bool InstantNTPPrerenderer::ShouldSwitchToLocalNTP() const {
243 if (!ntp())
244 return true;
245
246 // Assume users with Javascript disabled do not want the online experience.
247 if (!IsJavascriptEnabled())
248 return true;
249
250 // Already a local page. Not calling IsLocal() because we want to distinguish
251 // between the Google-specific and generic local NTP.
252 if (ntp()->instant_url() == GetLocalInstantURL())
253 return false;
254
255 if (PageIsCurrent())
256 return false;
257
258 // The preloaded NTP does not support instant yet. If we're not in startup,
259 // always fall back to the local NTP. If we are in startup, use the local NTP.
260 return !InStartup();
261 }
262
DefaultSearchProviderChanged()263 void InstantNTPPrerenderer::DefaultSearchProviderChanged() {
264 ReloadInstantNTP();
265 }
266
GoogleURLUpdated()267 void InstantNTPPrerenderer::GoogleURLUpdated() {
268 ReloadInstantNTP();
269 }
270