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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/ash/components/phonehub/cros_state_sender.h"
#include "ash/constants/ash_features.h"
#include "base/metrics/histogram_functions.h"
#include "chromeos/ash/components/multidevice/logging/logging.h"
#include "chromeos/ash/components/phonehub/message_sender.h"
#include "chromeos/ash/components/phonehub/phone_model.h"
#include "chromeos/ash/components/phonehub/public/cpp/attestation_certificate_generator.h"
#include "chromeos/ash/services/multidevice_setup/public/mojom/multidevice_setup.mojom.h"
namespace ash::phonehub {
namespace {
using multidevice_setup::mojom::Feature;
using multidevice_setup::mojom::FeatureState;
// The minimum time to wait before checking whether the phone has responded to
// status messages sent by CrosStateSender, and re-sending the status messages
// if there was no response (no phone status model exists).
constexpr base::TimeDelta kMinimumRetryDelay = base::Seconds(15u);
// The amount the previous delay is multiplied by to determine the new amount
// of time to wait before determining whether CrosStateSender should resend the
// CrOS State. Follows a doubling sequence, e.g 2 sec, 4 sec, 8 sec... etc.
constexpr int kRetryDelayMultiplier = 2;
} // namespace
CrosStateSender::CrosStateSender(
MessageSender* message_sender,
secure_channel::ConnectionManager* connection_manager,
multidevice_setup::MultiDeviceSetupClient* multidevice_setup_client,
PhoneModel* phone_model,
std::unique_ptr<AttestationCertificateGenerator>
attestation_certificate_generator)
: CrosStateSender(message_sender,
connection_manager,
multidevice_setup_client,
phone_model,
std::make_unique<base::OneShotTimer>(),
std::move(attestation_certificate_generator)) {}
CrosStateSender::CrosStateSender(
MessageSender* message_sender,
secure_channel::ConnectionManager* connection_manager,
multidevice_setup::MultiDeviceSetupClient* multidevice_setup_client,
PhoneModel* phone_model,
std::unique_ptr<base::OneShotTimer> timer,
std::unique_ptr<AttestationCertificateGenerator>
attestation_certificate_generator)
: message_sender_(message_sender),
connection_manager_(connection_manager),
multidevice_setup_client_(multidevice_setup_client),
phone_model_(phone_model),
retry_timer_(std::move(timer)),
retry_delay_(kMinimumRetryDelay),
attestation_certificate_generator_(
std::move(attestation_certificate_generator)) {
DCHECK(message_sender_);
DCHECK(connection_manager_);
DCHECK(multidevice_setup_client_);
DCHECK(phone_model_);
DCHECK(retry_timer_);
connection_manager_->AddObserver(this);
multidevice_setup_client_->AddObserver(this);
if (attestation_certificate_generator_) {
attestation_certificate_generator_->AddObserver(this);
}
}
CrosStateSender::~CrosStateSender() {
connection_manager_->RemoveObserver(this);
multidevice_setup_client_->RemoveObserver(this);
if (attestation_certificate_generator_) {
attestation_certificate_generator_->RemoveObserver(this);
}
}
void CrosStateSender::AttemptUpdateCrosState() {
// Stop and cancel old timer if it is running, and reset the |retry_delay_| to
// |kMinimumRetryDelay|.
retry_timer_->Stop();
retry_delay_ = kMinimumRetryDelay;
// Wait for connection to be established.
if (connection_manager_->GetStatus() !=
secure_channel::ConnectionManager::Status::kConnected) {
PA_LOG(VERBOSE) << "Could not start AttemptUpdateCrosState() because "
<< "connection manager status is: "
<< connection_manager_->GetStatus();
is_certificate_requested_ = false;
return;
}
PerformUpdateCrosState();
}
void CrosStateSender::PerformUpdateCrosState() {
// If Eche isn't enabled, or there's no way to generate an attestation
// certificate, send the CrosState message without attestation.
if (!features::IsEcheSWAEnabled() ||
attestation_certificate_generator_ == nullptr) {
SendCrosStateMessage(nullptr);
return;
}
attestation_generating_start_time_ = base::Time::Now();
is_certificate_requested_ = true;
attestation_certificate_generator_->RetrieveCertificate();
}
void CrosStateSender::RecordResultMetrics(
bool is_attestation_certificate_valid) {
base::UmaHistogramLongTimes(
is_attestation_certificate_valid
? "PhoneHub.Attestation.GeneratingTime"
: "PhoneHub.Attestation.GeneratingTime.Invalid",
base::Time::NowFromSystemTime() - attestation_generating_start_time_);
base::UmaHistogramBoolean("PhoneHub.Attestation.Result",
is_attestation_certificate_valid);
}
void CrosStateSender::SendCrosStateMessage(
const std::vector<std::string>* attestation_certs) {
bool are_notifications_enabled =
multidevice_setup_client_->GetFeatureState(
Feature::kPhoneHubNotifications) == FeatureState::kEnabledByUser;
bool is_camera_roll_enabled =
multidevice_setup_client_->GetFeatureState(
Feature::kPhoneHubCameraRoll) == FeatureState::kEnabledByUser;
PA_LOG(INFO) << "Attempting to send cros state with notifications enabled "
<< "state as: " << are_notifications_enabled
<< " and camera roll enabled state as: "
<< is_camera_roll_enabled;
message_sender_->SendCrosState(are_notifications_enabled,
is_camera_roll_enabled, attestation_certs);
retry_timer_->Start(FROM_HERE, retry_delay_,
base::BindOnce(&CrosStateSender::OnRetryTimerFired,
base::Unretained(this)));
}
void CrosStateSender::OnRetryTimerFired() {
// If the phone status model is non-null, implying that the phone has
// responded to the previous PerformUpdateCrosState(), or if the
// connection status is no longer in the connected state, do not
// retry sending the cros state.
if (phone_model_->phone_status_model().has_value() ||
connection_manager_->GetStatus() !=
secure_channel::ConnectionManager::Status::kConnected) {
return;
}
retry_delay_ *= kRetryDelayMultiplier;
PerformUpdateCrosState();
}
void CrosStateSender::OnConnectionStatusChanged() {
AttemptUpdateCrosState();
}
void CrosStateSender::OnFeatureStatesChanged(
const multidevice_setup::MultiDeviceSetupClient::FeatureStatesMap&
feature_states_map) {
AttemptUpdateCrosState();
}
void CrosStateSender::OnCertificateGenerated(
const std::vector<std::string>& attestation_certs,
bool is_valid) {
if (connection_manager_->GetStatus() !=
secure_channel::ConnectionManager::Status::kConnected) {
return;
}
// Skip sending CrosState update messages when we don't have a valid
// certificate, unless this is the initial connection or there has been a
// feature status change.
if (!is_valid && !is_certificate_requested_) {
return;
}
if (is_certificate_requested_) {
is_certificate_requested_ = false;
RecordResultMetrics(is_valid);
}
SendCrosStateMessage(&attestation_certs);
}
} // namespace ash::phonehub
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