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// Copyright 2023 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/metrics/structured/key_data_provider_ash.h"
#include "chrome/browser/profiles/profile_manager.h"
#include "components/metrics/structured/key_data_provider_file.h"
#include "components/metrics/structured/structured_metrics_validator.h"
namespace metrics::structured {
namespace {
// Default delay period for the PersistentProto. This is the delay before a file
// write is triggered after a change has been made.
constexpr base::TimeDelta kSaveDelay = base::Milliseconds(1000);
// The path used to store per-profile keys. Relative to the user's
// cryptohome. This file is created by chromium.
constexpr char kProfileKeyPath[] = "structured_metrics/keys";
// The path used to store per-device keys. This file is created by tmpfiles.d
// on start and has its permissions and ownership set such that it is writable
// by chronos.
constexpr char kDeviceKeyPath[] = "/var/lib/metrics/structured/chromium/keys";
} // namespace
KeyDataProviderAsh::KeyDataProviderAsh()
: KeyDataProviderAsh(base::FilePath(kDeviceKeyPath), kSaveDelay) {}
KeyDataProviderAsh::KeyDataProviderAsh(const base::FilePath& device_key_path,
base::TimeDelta write_delay)
: device_key_path_(device_key_path), write_delay_(write_delay) {
device_key_ =
std::make_unique<KeyDataProviderFile>(device_key_path_, write_delay_);
device_key_->AddObserver(this);
}
KeyDataProviderAsh::~KeyDataProviderAsh() {
device_key_->RemoveObserver(this);
if (profile_key_) {
profile_key_->RemoveObserver(this);
}
}
bool KeyDataProviderAsh::IsReady() {
DCHECK(device_key_);
return device_key_->IsReady();
}
std::optional<uint64_t> KeyDataProviderAsh::GetId(
const std::string& project_name) {
KeyDataProvider* key_data_provider = GetKeyDataProvider(project_name);
if (!key_data_provider) {
return std::nullopt;
}
return key_data_provider->GetId(project_name);
}
std::optional<uint64_t> KeyDataProviderAsh::GetSecondaryId(
const std::string& project_name) {
const auto* project_validator =
validator::Validators::Get()->GetProjectValidator(project_name);
if (!project_validator) {
return std::nullopt;
}
// If |project_name| is not of type sequence, return std::nullopt as it
// should not have a corresponding secondary ID.
if (project_validator->event_type() != StructuredEventProto::SEQUENCE) {
return std::nullopt;
}
DCHECK(device_key_);
if (device_key_->IsReady()) {
return device_key_->GetId(project_name);
}
return std::nullopt;
}
KeyData* KeyDataProviderAsh::GetKeyData(const std::string& project_name) {
auto* key_data_provider = GetKeyDataProvider(project_name);
if (!key_data_provider || !key_data_provider->IsReady()) {
return nullptr;
}
return key_data_provider->GetKeyData(project_name);
}
void KeyDataProviderAsh::Purge() {
if (device_key_) {
device_key_->Purge();
}
if (profile_key_) {
profile_key_->Purge();
}
}
void KeyDataProviderAsh::OnKeyReady() {
NotifyKeyReady();
}
void KeyDataProviderAsh::ProfileAdded(const Profile& profile) {
// Only the primary user's keys should be loaded. If there is already is a
// profile key, no-op.
if (profile_key_) {
return;
}
const base::FilePath& profile_path = profile.GetPath();
profile_key_ = std::make_unique<KeyDataProviderFile>(
profile_path.Append(kProfileKeyPath), write_delay_);
profile_key_->AddObserver(this);
}
KeyDataProvider* KeyDataProviderAsh::GetKeyDataProvider(
const std::string& project_name) {
const auto* project_validator =
validator::Validators::Get()->GetProjectValidator(project_name);
if (!project_validator) {
return nullptr;
}
switch (project_validator->id_scope()) {
case IdScope::kPerProfile: {
if (profile_key_) {
return profile_key_.get();
}
break;
}
case IdScope::kPerDevice: {
// Retrieve the profile key if the type is a sequence.
if (project_validator->event_type() == StructuredEventProto::SEQUENCE) {
return profile_key_ ? profile_key_.get() : nullptr;
}
if (device_key_) {
return device_key_.get();
}
break;
}
default:
NOTREACHED();
}
return nullptr;
}
} // namespace metrics::structured
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