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// Copyright 2021 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/new_tab_page/modules/safe_browsing/safe_browsing_handler.h"
#include "base/metrics/field_trial_params.h"
#include "base/time/time.h"
#include "chrome/browser/new_tab_page/modules/safe_browsing/safe_browsing_prefs.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/safe_browsing/safe_browsing_metrics_collector_factory.h"
#include "components/prefs/pref_registry_simple.h"
#include "components/prefs/pref_service.h"
#include "components/safe_browsing/core/browser/safe_browsing_metrics_collector.h"
#include "components/safe_browsing/core/common/safe_browsing_policy_handler.h"
#include "components/safe_browsing/core/common/safe_browsing_prefs.h"
#include "components/search/ntp_features.h"
using ::safe_browsing::IsEnhancedProtectionEnabled;
using ::safe_browsing::SafeBrowsingMetricsCollectorFactory;
using ::safe_browsing::SafeBrowsingPolicyHandler;
namespace ntp {
namespace {
// Get end time for last cooldown. Returns epoch + cooldown_period if no
// cooldown happened.
base::Time GetLastCooldownEndTime(PrefService* pref_service) {
base::Time cooldown_start = base::Time::FromDeltaSinceWindowsEpoch(
base::Seconds(pref_service->GetInt64(
prefs::kSafeBrowsingModuleLastCooldownStartAt)));
// The field param is passed as a double, to allow manual testing using a
// fraction of a day as cooldown.
double cooldown_days = base::GetFieldTrialParamByFeatureAsDouble(
ntp_features::kNtpSafeBrowsingModule,
ntp_features::kNtpSafeBrowsingModuleCooldownPeriodDaysParam,
/*default_value=*/30.0);
base::TimeDelta cooldown_period = base::Seconds(static_cast<int>(
cooldown_days * base::Time::kHoursPerDay * base::Time::kSecondsPerHour));
return cooldown_start + cooldown_period;
}
void SetModuleCooldownPrefs(PrefService* pref_service,
int64_t cooldown_start_time,
int module_shown_count) {
pref_service->SetInt64(prefs::kSafeBrowsingModuleLastCooldownStartAt,
cooldown_start_time);
pref_service->SetInteger(prefs::kSafeBrowsingModuleShownCount,
module_shown_count);
}
} // namespace
SafeBrowsingHandler::SafeBrowsingHandler(
mojo::PendingReceiver<ntp::safe_browsing::mojom::SafeBrowsingHandler>
handler,
Profile* profile)
: handler_(this, std::move(handler)),
metrics_collector_(
SafeBrowsingMetricsCollectorFactory::GetForProfile(profile)),
pref_service_(profile->GetPrefs()),
saved_last_cooldown_start_time_(0),
saved_module_shown_count_(0) {}
SafeBrowsingHandler::~SafeBrowsingHandler() = default;
void SafeBrowsingHandler::CanShowModule(CanShowModuleCallback callback) {
bool managed =
SafeBrowsingPolicyHandler::IsSafeBrowsingProtectionLevelSetByPolicy(
pref_service_);
bool already_enabled = IsEnhancedProtectionEnabled(*pref_service_);
bool module_already_opened =
pref_service_->GetBoolean(prefs::kSafeBrowsingModuleOpened);
base::Time cooldown_end = GetLastCooldownEndTime(pref_service_);
// Do not show the module if Safe Browsing protection level is controlled by
// policy, or is already enabled, if the user has clicked on the module button
// earlier, or if the user is in cooldown.
if (managed || already_enabled || module_already_opened ||
(base::Time::Now() < cooldown_end)) {
std::move(callback).Run(false);
return;
}
std::optional<base::Time> latest_event_time =
metrics_collector_->GetLatestSecuritySensitiveEventTimestamp();
// Do not show if there is no security sensitive event after the latest
// cooldown.
if (!latest_event_time.has_value() || latest_event_time < cooldown_end) {
std::move(callback).Run(false);
return;
}
int module_shown_count =
pref_service_->GetInteger(prefs::kSafeBrowsingModuleShownCount);
int module_shown_count_max = base::GetFieldTrialParamByFeatureAsInt(
ntp_features::kNtpSafeBrowsingModule,
ntp_features::kNtpSafeBrowsingModuleCountMaxParam,
/*default_value=*/5);
// Start cooldown if module has been shown module_shown_count_max times.
if (module_shown_count + 1 >= module_shown_count_max) {
SetModuleCooldownPrefs(
pref_service_, base::Time::Now().ToDeltaSinceWindowsEpoch().InSeconds(),
/*module_shown_count=*/0);
} else {
pref_service_->SetInteger(prefs::kSafeBrowsingModuleShownCount,
module_shown_count + 1);
}
std::move(callback).Run(true);
}
void SafeBrowsingHandler::ProcessModuleClick() {
pref_service_->SetBoolean(prefs::kSafeBrowsingModuleOpened, true);
}
void SafeBrowsingHandler::DismissModule() {
saved_last_cooldown_start_time_ =
pref_service_->GetInt64(prefs::kSafeBrowsingModuleLastCooldownStartAt);
saved_module_shown_count_ =
pref_service_->GetInteger(prefs::kSafeBrowsingModuleShownCount);
SetModuleCooldownPrefs(
pref_service_, base::Time::Now().ToDeltaSinceWindowsEpoch().InSeconds(),
/*module_shown_count=*/0);
}
void SafeBrowsingHandler::RestoreModule() {
SetModuleCooldownPrefs(pref_service_, saved_last_cooldown_start_time_,
saved_module_shown_count_);
}
// static
void SafeBrowsingHandler::RegisterProfilePrefs(PrefRegistrySimple* registry) {
registry->RegisterIntegerPref(prefs::kSafeBrowsingModuleShownCount, 0);
registry->RegisterInt64Pref(prefs::kSafeBrowsingModuleLastCooldownStartAt, 0);
registry->RegisterBooleanPref(prefs::kSafeBrowsingModuleOpened, false);
}
} // namespace ntp
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