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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/engagement/site_engagement_service.h"
#include <algorithm>
#include <cmath>
#include "base/command_line.h"
#include "base/time/clock.h"
#include "base/values.h"
#include "chrome/browser/engagement/site_engagement_helper.h"
#include "chrome/browser/engagement/site_engagement_service_factory.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/common/chrome_switches.h"
#include "components/content_settings/core/browser/host_content_settings_map.h"
#include "components/content_settings/core/common/content_settings_pattern.h"
#include "url/gurl.h"
namespace {
// Delta within which to consider scores equal.
const double kScoreDelta = 0.001;
// Delta within which to consider internal time values equal. Internal time
// values are in microseconds, so this delta comes out at one second.
const double kTimeDelta = 1000000;
bool DoublesConsideredDifferent(double value1, double value2, double delta) {
double abs_difference = fabs(value1 - value2);
return abs_difference > delta;
}
scoped_ptr<base::DictionaryValue> GetScoreDictForOrigin(
HostContentSettingsMap* settings,
const GURL& origin_url) {
if (!settings)
return scoped_ptr<base::DictionaryValue>();
scoped_ptr<base::Value> value = settings->GetWebsiteSetting(
origin_url, origin_url, CONTENT_SETTINGS_TYPE_SITE_ENGAGEMENT,
std::string(), NULL);
if (!value.get())
return make_scoped_ptr(new base::DictionaryValue());
if (!value->IsType(base::Value::TYPE_DICTIONARY))
return make_scoped_ptr(new base::DictionaryValue());
return make_scoped_ptr(static_cast<base::DictionaryValue*>(value.release()));
}
} // namespace
const char* SiteEngagementScore::kRawScoreKey = "rawScore";
const char* SiteEngagementScore::kPointsAddedTodayKey = "pointsAddedToday";
const char* SiteEngagementScore::kLastEngagementTimeKey = "lastEngagementTime";
const double SiteEngagementScore::kMaxPoints = 100;
const double SiteEngagementScore::kMaxPointsPerDay = 5;
const double SiteEngagementScore::kNavigationPoints = 1;
const int SiteEngagementScore::kDecayPeriodInDays = 7;
const double SiteEngagementScore::kDecayPoints = 5;
SiteEngagementScore::SiteEngagementScore(
base::Clock* clock,
const base::DictionaryValue& score_dict)
: SiteEngagementScore(clock) {
score_dict.GetDouble(kRawScoreKey, &raw_score_);
score_dict.GetDouble(kPointsAddedTodayKey, &points_added_today_);
double internal_time;
if (score_dict.GetDouble(kLastEngagementTimeKey, &internal_time))
last_engagement_time_ = base::Time::FromInternalValue(internal_time);
}
SiteEngagementScore::~SiteEngagementScore() {
}
double SiteEngagementScore::Score() const {
return DecayedScore();
}
void SiteEngagementScore::AddPoints(double points) {
// As the score is about to be updated, commit any decay that has happened
// since the last update.
raw_score_ = DecayedScore();
base::Time now = clock_->Now();
if (!last_engagement_time_.is_null() &&
now.LocalMidnight() != last_engagement_time_.LocalMidnight()) {
points_added_today_ = 0;
}
double to_add =
std::min(kMaxPoints - raw_score_, kMaxPointsPerDay - points_added_today_);
to_add = std::min(to_add, points);
points_added_today_ += to_add;
raw_score_ += to_add;
last_engagement_time_ = now;
}
bool SiteEngagementScore::UpdateScoreDict(base::DictionaryValue* score_dict) {
double raw_score_orig = 0;
double points_added_today_orig = 0;
double last_engagement_time_internal_orig = 0;
score_dict->GetDouble(kRawScoreKey, &raw_score_orig);
score_dict->GetDouble(kPointsAddedTodayKey, &points_added_today_orig);
score_dict->GetDouble(kLastEngagementTimeKey,
&last_engagement_time_internal_orig);
bool changed =
DoublesConsideredDifferent(raw_score_orig, raw_score_, kScoreDelta) ||
DoublesConsideredDifferent(points_added_today_orig, points_added_today_,
kScoreDelta) ||
DoublesConsideredDifferent(last_engagement_time_internal_orig,
last_engagement_time_.ToInternalValue(),
kTimeDelta);
if (!changed)
return false;
score_dict->SetDouble(kRawScoreKey, raw_score_);
score_dict->SetDouble(kPointsAddedTodayKey, points_added_today_);
score_dict->SetDouble(kLastEngagementTimeKey,
last_engagement_time_.ToInternalValue());
return true;
}
SiteEngagementScore::SiteEngagementScore(base::Clock* clock)
: clock_(clock),
raw_score_(0),
points_added_today_(0),
last_engagement_time_() {}
double SiteEngagementScore::DecayedScore() const {
// Note that users can change their clock, so from this system's perspective
// time can go backwards. If that does happen and the system detects that the
// current day is earlier than the last engagement, no decay (or growth) is
// applied.
int days_since_engagement = (clock_->Now() - last_engagement_time_).InDays();
if (days_since_engagement < 0)
return raw_score_;
int periods = days_since_engagement / kDecayPeriodInDays;
double decayed_score = raw_score_ - periods * kDecayPoints;
return std::max(0.0, decayed_score);
}
// static
SiteEngagementService* SiteEngagementService::Get(Profile* profile) {
return SiteEngagementServiceFactory::GetForProfile(profile);
}
// static
bool SiteEngagementService::IsEnabled() {
return base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kEnableSiteEngagementService);
}
SiteEngagementService::SiteEngagementService(Profile* profile)
: profile_(profile) {
}
SiteEngagementService::~SiteEngagementService() {
}
void SiteEngagementService::HandleNavigation(const GURL& url) {
HostContentSettingsMap* settings_map = profile_->GetHostContentSettingsMap();
scoped_ptr<base::DictionaryValue> score_dict =
GetScoreDictForOrigin(settings_map, url);
SiteEngagementScore score(&clock_, *score_dict);
score.AddPoints(SiteEngagementScore::kNavigationPoints);
if (score.UpdateScoreDict(score_dict.get())) {
ContentSettingsPattern pattern(
ContentSettingsPattern::FromURLNoWildcard(url));
if (!pattern.IsValid())
return;
settings_map->SetWebsiteSetting(pattern, ContentSettingsPattern::Wildcard(),
CONTENT_SETTINGS_TYPE_SITE_ENGAGEMENT,
std::string(), score_dict.release());
}
}
int SiteEngagementService::GetScore(const GURL& url) {
HostContentSettingsMap* settings_map = profile_->GetHostContentSettingsMap();
scoped_ptr<base::DictionaryValue> score_dict =
GetScoreDictForOrigin(settings_map, url);
SiteEngagementScore score(&clock_, *score_dict);
return score.Score();
}
int SiteEngagementService::GetTotalEngagementPoints() {
HostContentSettingsMap* settings_map = profile_->GetHostContentSettingsMap();
ContentSettingsForOneType engagement_settings;
settings_map->GetSettingsForOneType(CONTENT_SETTINGS_TYPE_SITE_ENGAGEMENT,
std::string(), &engagement_settings);
int total_score = 0;
for (const auto& site : engagement_settings) {
GURL origin(site.primary_pattern.ToString());
if (!origin.is_valid())
continue;
scoped_ptr<base::DictionaryValue> score_dict =
GetScoreDictForOrigin(settings_map, origin);
SiteEngagementScore score(&clock_, *score_dict);
total_score += score.Score();
}
return total_score;
}
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