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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "headless/lib/browser/headless_field_trials.h"
#include <functional>
#include <memory>
#include <vector>
#include "base/command_line.h"
#include "base/feature_list.h"
#include "components/metrics/enabled_state_provider.h"
#include "components/metrics/metrics_state_manager.h"
#include "components/prefs/pref_service.h"
#include "components/variations/platform_field_trials.h"
#include "components/variations/seed_response.h"
#include "components/variations/service/safe_seed_manager.h"
#include "components/variations/service/ui_string_overrider.h"
#include "components/variations/service/variations_field_trial_creator.h"
#include "components/variations/service/variations_service_client.h"
#include "components/variations/variations_safe_seed_store_local_state.h"
#include "components/variations/variations_seed_store.h"
#include "components/variations/variations_switches.h"
#include "content/public/common/content_switch_dependent_feature_overrides.h"
#include "services/network/public/cpp/shared_url_loader_factory.h"
namespace headless {
namespace {
// A simple concrete implementation of the EnabledStateProvider interface.
class HeadlessEnabledStateProvider : public metrics::EnabledStateProvider {
public:
HeadlessEnabledStateProvider(bool consent, bool enabled)
: consent_(consent), enabled_(enabled) {}
HeadlessEnabledStateProvider(const HeadlessEnabledStateProvider&) = delete;
HeadlessEnabledStateProvider& operator=(const HeadlessEnabledStateProvider&) =
delete;
~HeadlessEnabledStateProvider() override = default;
// metrics::EnabledStateProvider
bool IsConsentGiven() const override { return consent_; }
bool IsReportingEnabled() const override { return enabled_; }
private:
bool consent_;
bool enabled_;
};
class HeadlessVariationsServiceClient
: public variations::VariationsServiceClient {
public:
HeadlessVariationsServiceClient() = default;
~HeadlessVariationsServiceClient() override = default;
// variations::VariationsServiceClient:
base::Version GetVersionForSimulation() override { return base::Version(); }
scoped_refptr<network::SharedURLLoaderFactory> GetURLLoaderFactory()
override {
return nullptr;
}
network_time::NetworkTimeTracker* GetNetworkTimeTracker() override {
return nullptr;
}
version_info::Channel GetChannel() override {
return version_info::Channel::UNKNOWN;
}
bool OverridesRestrictParameter(std::string* parameter) override {
return false;
}
bool IsEnterprise() override { return false; }
void RemoveGoogleGroupsFromPrefsForDeletedProfiles(
PrefService* local_state) override {}
};
} // namespace
bool ShouldEnableFieldTrials() {
static bool should_enable_field_trials =
base::CommandLine::ForCurrentProcess()->HasSwitch(
variations::switches::kEnableFieldTrialTestingConfig);
return should_enable_field_trials;
}
void SetUpFieldTrials(PrefService* local_state,
const base::FilePath& user_data_dir) {
CHECK(local_state);
HeadlessEnabledStateProvider enabled_state_provider(/*consent=*/false,
/*enabled=*/false);
std::unique_ptr<metrics::MetricsStateManager> metrics_state_manager =
metrics::MetricsStateManager::Create(local_state, &enabled_state_provider,
std::wstring(), user_data_dir);
metrics_state_manager->InstantiateFieldTrialList();
HeadlessVariationsServiceClient variations_service_client;
variations::VariationsFieldTrialCreator field_trial_creator(
&variations_service_client,
std::make_unique<variations::VariationsSeedStore>(
local_state, /*initial_seed=*/nullptr,
/*signature_verification_enabled=*/true,
std::make_unique<variations::VariationsSafeSeedStoreLocalState>(
local_state, variations_service_client.GetVariationsSeedFileDir(),
variations_service_client.GetChannelForVariations(),
/*entropy_providers=*/nullptr),
variations_service_client.GetChannelForVariations(),
variations_service_client.GetVariationsSeedFileDir()),
variations::UIStringOverrider());
variations::SafeSeedManager safe_seed_manager(local_state);
const base::CommandLine& command_line =
*base::CommandLine::ForCurrentProcess();
// Overrides for content/common and lower layers' switches.
std::vector<base::FeatureList::FeatureOverrideInfo> feature_overrides =
content::GetSwitchDependentFeatureOverrides(command_line);
// Setup field trials directly without help of the variations service.
std::vector<std::string> variation_ids;
auto feature_list = std::make_unique<base::FeatureList>();
variations::PlatformFieldTrials platform_field_trials;
field_trial_creator.SetUpFieldTrials(
variation_ids,
command_line.GetSwitchValueASCII(
variations::switches::kForceVariationIds),
feature_overrides, std::move(feature_list), metrics_state_manager.get(),
&platform_field_trials, &safe_seed_manager,
/*add_entropy_source_to_variations_ids=*/false,
*metrics_state_manager->CreateEntropyProviders(
/*enable_limited_entropy_mode=*/false));
}
} // namespace headless
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