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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/android/data_usage/data_use_matcher.h"
#include <utility>
#include "base/memory/weak_ptr.h"
#include "base/strings/string_number_conversions.h"
#include "base/time/default_tick_clock.h"
#include "base/time/tick_clock.h"
#include "chrome/browser/android/data_usage/external_data_use_observer.h"
#include "third_party/re2/src/re2/re2.h"
#include "url/gurl.h"
namespace chrome {
namespace android {
DataUseMatcher::DataUseMatcher(
const base::WeakPtr<DataUseTabModel>& data_use_tab_model,
const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner,
const base::WeakPtr<ExternalDataUseObserver>& external_data_use_observer,
const base::TimeDelta& default_matching_rule_expiration_duration)
: data_use_tab_model_(data_use_tab_model),
default_matching_rule_expiration_duration_(
default_matching_rule_expiration_duration),
tick_clock_(new base::DefaultTickClock()),
io_task_runner_(io_task_runner),
external_data_use_observer_(external_data_use_observer) {
DCHECK(io_task_runner_);
}
DataUseMatcher::~DataUseMatcher() {}
void DataUseMatcher::RegisterURLRegexes(
const std::vector<std::string>& app_package_names,
const std::vector<std::string>& domain_path_regexes,
const std::vector<std::string>& labels) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK_EQ(app_package_names.size(), domain_path_regexes.size());
DCHECK_EQ(app_package_names.size(), labels.size());
base::hash_set<std::string> removed_matching_rule_labels;
for (const auto& matching_rule : matching_rules_)
removed_matching_rule_labels.insert(matching_rule->label());
matching_rules_.clear();
re2::RE2::Options options(re2::RE2::DefaultOptions);
options.set_case_sensitive(false);
for (size_t i = 0; i < domain_path_regexes.size(); ++i) {
const std::string& url_regex = domain_path_regexes.at(i);
std::string app_package_name;
base::TimeTicks expiration;
const base::TimeTicks now_ticks = tick_clock_->NowTicks();
ParsePackageField(app_package_names.at(i), &app_package_name, &expiration);
if (url_regex.empty() && app_package_name.empty())
continue;
scoped_ptr<re2::RE2> pattern(new re2::RE2(url_regex, options));
if (!pattern->ok())
continue;
if (expiration <= now_ticks)
continue; // skip expired matching rules.
DCHECK(!labels.at(i).empty());
matching_rules_.push_back(make_scoped_ptr(new MatchingRule(
app_package_name, std::move(pattern), labels.at(i), expiration)));
removed_matching_rule_labels.erase(labels.at(i));
}
for (const std::string& label : removed_matching_rule_labels) {
if (data_use_tab_model_)
data_use_tab_model_->OnTrackingLabelRemoved(label);
}
DCHECK(io_task_runner_);
// Notify |external_data_use_observer_| if it should register as a data use
// observer.
io_task_runner_->PostTask(
FROM_HERE,
base::Bind(&ExternalDataUseObserver::ShouldRegisterAsDataUseObserver,
external_data_use_observer_, !matching_rules_.empty()));
}
bool DataUseMatcher::MatchesURL(const GURL& url, std::string* label) const {
const base::TimeTicks now_ticks = tick_clock_->NowTicks();
DCHECK(thread_checker_.CalledOnValidThread());
*label = "";
if (!url.is_valid() || url.is_empty())
return false;
for (const auto& matching_rule : matching_rules_) {
if (matching_rule->expiration() <= now_ticks)
continue; // skip expired matching rules.
if (re2::RE2::FullMatch(url.spec(), *(matching_rule->pattern()))) {
*label = matching_rule->label();
return true;
}
}
return false;
}
bool DataUseMatcher::MatchesAppPackageName(const std::string& app_package_name,
std::string* label) const {
const base::TimeTicks now_ticks = tick_clock_->NowTicks();
DCHECK(thread_checker_.CalledOnValidThread());
*label = "";
if (app_package_name.empty())
return false;
for (const auto& matching_rule : matching_rules_) {
if (matching_rule->expiration() <= now_ticks)
continue; // skip expired matching rules.
if (app_package_name == matching_rule->app_package_name()) {
*label = matching_rule->label();
return true;
}
}
return false;
}
void DataUseMatcher::ParsePackageField(const std::string& app_package_name,
std::string* new_app_package_name,
base::TimeTicks* expiration) const {
const char separator = '|';
size_t index = app_package_name.find_last_of(separator);
uint64_t
expiration_milliseconds; // expiration time as milliSeconds since epoch.
if (index != std::string::npos &&
base::StringToUint64(app_package_name.substr(index + 1),
&expiration_milliseconds)) {
*new_app_package_name = app_package_name.substr(0, index);
*expiration = base::TimeTicks::UnixEpoch() +
base::TimeDelta::FromMilliseconds(expiration_milliseconds);
return;
}
*expiration =
tick_clock_->NowTicks() + default_matching_rule_expiration_duration_;
*new_app_package_name = app_package_name;
}
DataUseMatcher::MatchingRule::MatchingRule(const std::string& app_package_name,
scoped_ptr<re2::RE2> pattern,
const std::string& label,
const base::TimeTicks& expiration)
: app_package_name_(app_package_name),
pattern_(pattern.Pass()),
label_(label),
expiration_(expiration) {}
DataUseMatcher::MatchingRule::~MatchingRule() {}
const re2::RE2* DataUseMatcher::MatchingRule::pattern() const {
return pattern_.get();
}
const std::string& DataUseMatcher::MatchingRule::app_package_name() const {
return app_package_name_;
}
const std::string& DataUseMatcher::MatchingRule::label() const {
return label_;
}
const base::TimeTicks& DataUseMatcher::MatchingRule::expiration() const {
return expiration_;
}
} // namespace android
} // namespace chrome
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