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// Copyright 2022 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/component_updater/screen_ai_component_installer.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/logging.h"
#include "base/task/thread_pool.h"
#include "base/values.h"
#include "base/version.h"
#include "chrome/browser/screen_ai/screen_ai_install_state.h"
#include "components/component_updater/component_updater_service.h"
#include "components/crx_file/id_util.h"
#include "components/update_client/update_client_errors.h"
#include "content/public/browser/browser_thread.h"
#include "crypto/sha2.h"
#include "services/screen_ai/public/cpp/utilities.h"
using content::BrowserThread;
namespace {
// The SHA256 of the SubjectPublicKeyInfo used to sign the component.
// The component id is: mfhmdacoffpmifoibamicehhklffanao
constexpr uint8_t kScreenAIPublicKeySHA256[32] = {
0xc5, 0x7c, 0x30, 0x2e, 0x55, 0xfc, 0x85, 0xe8, 0x10, 0xc8, 0x24,
0x77, 0xab, 0x55, 0x0d, 0x0e, 0x5a, 0xed, 0x04, 0x7b, 0x1e, 0x16,
0x86, 0x7c, 0xf0, 0x42, 0x71, 0x85, 0xe4, 0x31, 0x2d, 0xc5};
static_assert(std::size(kScreenAIPublicKeySHA256) == crypto::kSHA256Length);
constexpr char kScreenAIManifestName[] = "ScreenAI Library";
} // namespace
namespace component_updater {
ScreenAIComponentInstallerPolicy::ScreenAIComponentInstallerPolicy() = default;
ScreenAIComponentInstallerPolicy::~ScreenAIComponentInstallerPolicy() = default;
bool ScreenAIComponentInstallerPolicy::
SupportsGroupPolicyEnabledComponentUpdates() const {
return true;
}
bool ScreenAIComponentInstallerPolicy::RequiresNetworkEncryption() const {
// This component is deployed only to the users of assistive technologies.
// Tracking it reveals personal information about the user.
return true;
}
update_client::CrxInstaller::Result
ScreenAIComponentInstallerPolicy::OnCustomInstall(
const base::Value::Dict& manifest,
const base::FilePath& install_dir) {
return update_client::CrxInstaller::Result(update_client::InstallError::NONE);
}
void ScreenAIComponentInstallerPolicy::OnCustomUninstall() {}
void ScreenAIComponentInstallerPolicy::ComponentReady(
const base::Version& version,
const base::FilePath& install_dir,
base::Value::Dict manifest) {
VLOG(1) << "Screen AI Component ready, version " << version.GetString()
<< " in " << install_dir.value();
screen_ai::ScreenAIInstallState::GetInstance()->SetComponentFolder(
install_dir);
}
bool ScreenAIComponentInstallerPolicy::VerifyInstallation(
const base::Value::Dict& manifest,
const base::FilePath& install_dir) const {
VLOG(1) << "Verifying Screen AI component in " << install_dir.value();
base::Version version;
DCHECK(!version.IsValid());
const base::Value* version_value = manifest.Find("version");
if (version_value && version_value->is_string()) {
version = base::Version(version_value->GetString());
}
return screen_ai::ScreenAIInstallState::VerifyLibraryVersion(version);
}
base::FilePath ScreenAIComponentInstallerPolicy::GetRelativeInstallDir() const {
return screen_ai::GetRelativeInstallDir();
}
// static
std::string ScreenAIComponentInstallerPolicy::GetOmahaId() {
return crx_file::id_util::GenerateIdFromHash(kScreenAIPublicKeySHA256);
}
void ScreenAIComponentInstallerPolicy::GetHash(
std::vector<uint8_t>* hash) const {
hash->assign(std::begin(kScreenAIPublicKeySHA256),
std::end(kScreenAIPublicKeySHA256));
}
std::string ScreenAIComponentInstallerPolicy::GetName() const {
return kScreenAIManifestName;
}
update_client::InstallerAttributes
ScreenAIComponentInstallerPolicy::GetInstallerAttributes() const {
return update_client::InstallerAttributes();
}
// static
void ScreenAIComponentInstallerPolicy::DeleteComponent() {
base::DeletePathRecursively(screen_ai::GetComponentDir());
}
void ManageScreenAIComponentRegistration(ComponentUpdateService* cus,
PrefService* local_state) {
if (screen_ai::ScreenAIInstallState::ShouldInstall(local_state)) {
// don't actually register the service - we don't want the binary blob
}
// Clean up.
if (base::PathExists(screen_ai::GetComponentDir())) {
ScreenAIComponentInstallerPolicy::DeleteComponent();
}
}
void RegisterScreenAIComponent(ComponentUpdateService* cus) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
// Only register once.
if (screen_ai::ScreenAIInstallState::GetInstance()->get_state() !=
screen_ai::ScreenAIInstallState::State::kNotDownloaded) {
return;
}
screen_ai::ScreenAIInstallState::GetInstance()->SetState(
screen_ai::ScreenAIInstallState::State::kDownloading);
auto installer = base::MakeRefCounted<ComponentInstaller>(
std::make_unique<ScreenAIComponentInstallerPolicy>());
installer->Register(cus, base::OnceClosure());
}
} // namespace component_updater
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