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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/preloading/prefetch/prefetch_service/chrome_prefetch_service_delegate.h"
#include "chrome/browser/battery/battery_saver.h"
#include "chrome/browser/data_saver/data_saver.h"
#if BUILDFLAG(IS_ANDROID)
#include "chrome/browser/flags/android/chrome_feature_list.h"
#endif // BUILDFLAG(IS_ANDROID)
#include "chrome/browser/preloading/prefetch/prefetch_service/prefetch_origin_decider.h"
#include "chrome/browser/preloading/preloading_features.h"
#include "chrome/browser/preloading/preloading_prefs.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/search_engines/template_url_service_factory.h"
#include "components/google/core/common/google_util.h"
#include "components/language/core/browser/pref_names.h"
#include "components/page_load_metrics/browser/metrics_web_contents_observer.h"
#include "components/prefs/pref_service.h"
#include "components/search_engines/template_url_service.h"
#include "components/unified_consent/url_keyed_data_collection_consent_helper.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/web_contents.h"
#include "google_apis/google_api_keys.h"
#include "net/http/http_util.h"
#include "url/gurl.h"
ChromePrefetchServiceDelegate::ChromePrefetchServiceDelegate(
content::BrowserContext* browser_context)
: profile_(Profile::FromBrowserContext(browser_context)),
origin_decider_(
std::make_unique<PrefetchOriginDecider>(profile_->GetPrefs())) {}
ChromePrefetchServiceDelegate::~ChromePrefetchServiceDelegate() = default;
std::string ChromePrefetchServiceDelegate::GetAcceptLanguageHeader() {
return net::HttpUtil::GenerateAcceptLanguageHeader(
profile_->GetPrefs()->GetString(language::prefs::kAcceptLanguages));
}
GURL ChromePrefetchServiceDelegate::GetDefaultPrefetchProxyHost() {
return GURL("https://tunnel.googlezip.net/");
}
std::string ChromePrefetchServiceDelegate::GetAPIKey() {
return google_apis::GetAPIKey();
}
GURL ChromePrefetchServiceDelegate::GetDefaultDNSCanaryCheckURL() {
return GURL("http://dns-tunnel-check.googlezip.net/connect");
}
GURL ChromePrefetchServiceDelegate::GetDefaultTLSCanaryCheckURL() {
return GURL("http://tls-tunnel-check.googlezip.net/connect");
}
void ChromePrefetchServiceDelegate::ReportOriginRetryAfter(
const GURL& url,
base::TimeDelta retry_after) {
return origin_decider_->ReportOriginRetryAfter(url, retry_after);
}
bool ChromePrefetchServiceDelegate::IsOriginOutsideRetryAfterWindow(
const GURL& url) {
return origin_decider_->IsOriginOutsideRetryAfterWindow(url);
}
void ChromePrefetchServiceDelegate::ClearData() {
origin_decider_->OnBrowsingDataCleared();
}
bool ChromePrefetchServiceDelegate::DisableDecoysBasedOnUserSettings() {
// If the user has opted-in to Make Search and Browsing Better, then there is
// no need to send decoy requests.
std::unique_ptr<unified_consent::UrlKeyedDataCollectionConsentHelper> helper =
unified_consent::UrlKeyedDataCollectionConsentHelper::
NewAnonymizedDataCollectionConsentHelper(profile_->GetPrefs());
return helper->IsEnabled();
}
content::PreloadingEligibility
ChromePrefetchServiceDelegate::IsSomePreloadingEnabled() {
return prefetch::IsSomePreloadingEnabled(*profile_->GetPrefs());
}
bool ChromePrefetchServiceDelegate::IsPreloadingPrefEnabled() {
return prefetch::IsSomePreloadingEnabled(*profile_->GetPrefs()) !=
content::PreloadingEligibility::kPreloadingDisabled;
}
bool ChromePrefetchServiceDelegate::IsDataSaverEnabled() {
return data_saver::IsDataSaverEnabled();
}
bool ChromePrefetchServiceDelegate::IsBatterySaverEnabled() {
return battery::IsBatterySaverEnabled();
}
bool ChromePrefetchServiceDelegate::IsExtendedPreloadingEnabled() {
return prefetch::GetPreloadPagesState(*profile_->GetPrefs()) ==
prefetch::PreloadPagesState::kExtendedPreloading;
}
bool ChromePrefetchServiceDelegate::IsDomainInPrefetchAllowList(
const GURL& referring_url) {
return IsGoogleDomainUrl(referring_url, google_util::ALLOW_SUBDOMAIN,
google_util::ALLOW_NON_STANDARD_PORTS) ||
IsYoutubeDomainUrl(referring_url, google_util::ALLOW_SUBDOMAIN,
google_util::ALLOW_NON_STANDARD_PORTS);
}
bool ChromePrefetchServiceDelegate::IsContaminationExempt(
const GURL& referring_url) {
// The default search engine has been chosen by the user and its cross-site
// navigations have a significant performance impact.
TemplateURLService* template_url_service =
TemplateURLServiceFactory::GetForProfile(profile_);
return template_url_service &&
template_url_service->IsSearchResultsPageFromDefaultSearchProvider(
referring_url);
}
bool ChromePrefetchServiceDelegate::IsContaminationExemptPerOrigin(
const url::Origin& referring_origin) {
#if BUILDFLAG(IS_ANDROID)
if (base::FeatureList::IsEnabled(chrome::android::kCCTNavigationalPrefetch)) {
TemplateURLService* template_url_service =
TemplateURLServiceFactory::GetForProfile(profile_);
return template_url_service &&
template_url_service->GetDefaultSearchProviderOrigin() ==
referring_origin;
}
#endif // BUILDFLAG(IS_ANDROID)
return false;
}
void ChromePrefetchServiceDelegate::OnPrefetchLikely(
content::WebContents* web_contents) {
page_load_metrics::MetricsWebContentsObserver* metrics_web_contents_observer =
page_load_metrics::MetricsWebContentsObserver::FromWebContents(
web_contents);
if (!metrics_web_contents_observer) {
return;
}
metrics_web_contents_observer->OnPrefetchLikely();
}
void ChromePrefetchServiceDelegate::SetAcceptLanguageHeader(
std::string accept_language_header) {
// no-op.
}
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