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// Copyright 2018 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/metadata_table_chromeos.h"
#include <algorithm>
#include <memory>
#include <string_view>
#include <utility>
#include <vector>
#include "base/hash/sha1.h"
#include "base/memory/ptr_util.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "components/component_updater/component_updater_paths.h"
#include "components/prefs/pref_registry_simple.h"
#include "components/prefs/pref_service.h"
#include "components/prefs/scoped_user_pref_update.h"
#include "components/user_manager/user_manager.h"
#include "content/public/browser/browser_thread.h"
namespace component_updater {
namespace {
// Path to the DictionaryValue in PrefService.
constexpr char kMetadataPrefPath[] = "component_updater_metadata";
// Schema of the DictionaryValue:
// {
// |kMetadataContentKey|:
// {
// {
// |kMetadataContentItemHashedUserIdKey|: |hashed_user_id|,
// |kMetadataContentItemComponentKey|: |component|,
// },
// ...
// }
// }
//
// Key to the content (installed items) in the DictionaryValue.
constexpr char kMetadataContentKey[] = "installed_items";
// Key to the hashed user id that installs the component.
constexpr char kMetadataContentItemHashedUserIdKey[] = "hashed_user_id";
// Key to the component name.
constexpr char kMetadataContentItemComponentKey[] = "component";
// Gets current active user.
const user_manager::User* GetActiveUser() {
DCHECK(user_manager::UserManager::Get());
return user_manager::UserManager::Get()->GetActiveUser();
}
// Converts username to a hashed string.
//
// The result is converted to lowercase to stay compatible with
// CryptoLib::HexEncodeToBuffer().
std::string HashUsername(std::string_view username) {
return base::ToLowerASCII(base::HexEncode(
base::SHA1Hash(base::as_byte_span(base::ToLowerASCII(username)))));
}
const std::string& GetRequiredStringFromDict(const base::Value& dict,
std::string_view key) {
const std::string* str = dict.GetDict().FindString(key);
DCHECK(str);
return *str;
}
} // namespace
MetadataTable::MetadataTable(PrefService* pref_service)
: pref_service_(pref_service) {
DCHECK(pref_service_);
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
Load();
}
MetadataTable::~MetadataTable() = default;
// static
std::unique_ptr<component_updater::MetadataTable>
MetadataTable::CreateForTest() {
return base::WrapUnique(new MetadataTable());
}
// static
void MetadataTable::RegisterPrefs(PrefRegistrySimple* registry) {
registry->RegisterDictionaryPref(kMetadataPrefPath);
}
bool MetadataTable::AddComponentForCurrentUser(
const std::string& component_name) {
const user_manager::User* active_user = GetActiveUser();
// Return immediately if action is performed when no user is signed in.
if (!active_user) {
return false;
}
const std::string hashed_user_id =
HashUsername(active_user->GetAccountId().GetUserEmail());
AddItem(hashed_user_id, component_name);
Store();
return true;
}
bool MetadataTable::DeleteComponentForCurrentUser(
const std::string& component_name) {
const user_manager::User* active_user = GetActiveUser();
// Return immediately if action is performed when no user is signed in.
if (!active_user) {
return false;
}
const std::string hashed_user_id =
HashUsername(active_user->GetAccountId().GetUserEmail());
if (!DeleteItem(hashed_user_id, component_name)) {
return false;
}
Store();
return true;
}
bool MetadataTable::HasComponentForAnyUser(
const std::string& component_name) const {
return std::ranges::any_of(
installed_items_, [&component_name](const base::Value& item) {
const std::string& name =
GetRequiredStringFromDict(item, kMetadataContentItemComponentKey);
return name == component_name;
});
}
MetadataTable::MetadataTable() : pref_service_(nullptr) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
}
void MetadataTable::Load() {
DCHECK(pref_service_);
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
const base::Value::Dict& dict = pref_service_->GetDict(kMetadataPrefPath);
const base::Value::List* installed_items = dict.FindList(kMetadataContentKey);
if (installed_items) {
installed_items_ = installed_items->Clone();
return;
}
installed_items_.clear();
Store();
}
void MetadataTable::Store() {
DCHECK(pref_service_);
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
ScopedDictPrefUpdate update(pref_service_, kMetadataPrefPath);
update->Set(kMetadataContentKey, installed_items_.Clone());
}
void MetadataTable::AddItem(const std::string& hashed_user_id,
const std::string& component_name) {
if (HasComponentForUser(hashed_user_id, component_name)) {
return;
}
base::Value::Dict item;
item.Set(kMetadataContentItemHashedUserIdKey, hashed_user_id);
item.Set(kMetadataContentItemComponentKey, component_name);
installed_items_.Append(std::move(item));
}
bool MetadataTable::DeleteItem(const std::string& hashed_user_id,
const std::string& component_name) {
size_t index = GetInstalledItemIndex(hashed_user_id, component_name);
if (index == installed_items_.size()) {
return false;
}
installed_items_.erase(installed_items_.begin() + index);
return true;
}
bool MetadataTable::HasComponentForUser(
const std::string& hashed_user_id,
const std::string& component_name) const {
return GetInstalledItemIndex(hashed_user_id, component_name) !=
installed_items_.size();
}
size_t MetadataTable::GetInstalledItemIndex(
const std::string& hashed_user_id,
const std::string& component_name) const {
for (size_t i = 0; i < installed_items_.size(); ++i) {
const auto& dict = installed_items_[i];
const std::string& user_id =
GetRequiredStringFromDict(dict, kMetadataContentItemHashedUserIdKey);
if (user_id != hashed_user_id) {
continue;
}
const std::string& name =
GetRequiredStringFromDict(dict, kMetadataContentItemComponentKey);
if (name != component_name) {
continue;
}
return i;
}
return installed_items_.size();
}
} // namespace component_updater
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