//
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// Copyright (C) 2012 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#include "update_engine/common/prefs.h"
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#include <algorithm>
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#include <base/files/file_util.h>
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#include <base/logging.h>
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#include <base/strings/string_number_conversions.h>
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#include <base/strings/string_util.h>
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#include "update_engine/common/utils.h"
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using std::string;
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namespace chromeos_update_engine {
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bool PrefsBase::GetString(const string& key, string* value) const {
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return storage_->GetKey(key, value);
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}
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bool PrefsBase::SetString(const string& key, const string& value) {
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TEST_AND_RETURN_FALSE(storage_->SetKey(key, value));
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const auto observers_for_key = observers_.find(key);
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if (observers_for_key != observers_.end()) {
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std::vector<ObserverInterface*> copy_observers(observers_for_key->second);
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for (ObserverInterface* observer : copy_observers)
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observer->OnPrefSet(key);
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}
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return true;
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}
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bool PrefsBase::GetInt64(const string& key, int64_t* value) const {
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string str_value;
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if (!GetString(key, &str_value))
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return false;
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base::TrimWhitespaceASCII(str_value, base::TRIM_ALL, &str_value);
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TEST_AND_RETURN_FALSE(base::StringToInt64(str_value, value));
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return true;
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}
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bool PrefsBase::SetInt64(const string& key, const int64_t value) {
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return SetString(key, base::Int64ToString(value));
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}
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bool PrefsBase::GetBoolean(const string& key, bool* value) const {
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string str_value;
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if (!GetString(key, &str_value))
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return false;
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base::TrimWhitespaceASCII(str_value, base::TRIM_ALL, &str_value);
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if (str_value == "false") {
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*value = false;
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return true;
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}
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if (str_value == "true") {
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*value = true;
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return true;
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}
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return false;
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}
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bool PrefsBase::SetBoolean(const string& key, const bool value) {
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return SetString(key, value ? "true" : "false");
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}
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bool PrefsBase::Exists(const string& key) const {
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return storage_->KeyExists(key);
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}
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bool PrefsBase::Delete(const string& key) {
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TEST_AND_RETURN_FALSE(storage_->DeleteKey(key));
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const auto observers_for_key = observers_.find(key);
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if (observers_for_key != observers_.end()) {
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std::vector<ObserverInterface*> copy_observers(observers_for_key->second);
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for (ObserverInterface* observer : copy_observers)
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observer->OnPrefDeleted(key);
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}
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return true;
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}
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void PrefsBase::AddObserver(const string& key, ObserverInterface* observer) {
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observers_[key].push_back(observer);
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}
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void PrefsBase::RemoveObserver(const string& key, ObserverInterface* observer) {
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std::vector<ObserverInterface*>& observers_for_key = observers_[key];
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auto observer_it =
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std::find(observers_for_key.begin(), observers_for_key.end(), observer);
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if (observer_it != observers_for_key.end())
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observers_for_key.erase(observer_it);
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}
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// Prefs
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bool Prefs::Init(const base::FilePath& prefs_dir) {
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return file_storage_.Init(prefs_dir);
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}
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bool Prefs::FileStorage::Init(const base::FilePath& prefs_dir) {
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prefs_dir_ = prefs_dir;
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return true;
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}
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bool Prefs::FileStorage::GetKey(const string& key, string* value) const {
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base::FilePath filename;
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TEST_AND_RETURN_FALSE(GetFileNameForKey(key, &filename));
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if (!base::ReadFileToString(filename, value)) {
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LOG(INFO) << key << " not present in " << prefs_dir_.value();
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return false;
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}
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return true;
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}
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bool Prefs::FileStorage::SetKey(const string& key, const string& value) {
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base::FilePath filename;
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TEST_AND_RETURN_FALSE(GetFileNameForKey(key, &filename));
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if (!base::DirectoryExists(filename.DirName())) {
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// Only attempt to create the directory if it doesn't exist to avoid calls
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// to parent directories where we might not have permission to write to.
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TEST_AND_RETURN_FALSE(base::CreateDirectory(filename.DirName()));
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}
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TEST_AND_RETURN_FALSE(base::WriteFile(filename, value.data(), value.size()) ==
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static_cast<int>(value.size()));
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return true;
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}
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bool Prefs::FileStorage::KeyExists(const string& key) const {
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base::FilePath filename;
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TEST_AND_RETURN_FALSE(GetFileNameForKey(key, &filename));
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return base::PathExists(filename);
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}
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bool Prefs::FileStorage::DeleteKey(const string& key) {
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base::FilePath filename;
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TEST_AND_RETURN_FALSE(GetFileNameForKey(key, &filename));
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TEST_AND_RETURN_FALSE(base::DeleteFile(filename, false));
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return true;
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}
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bool Prefs::FileStorage::GetFileNameForKey(const string& key,
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base::FilePath* filename) const {
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// Allows only non-empty keys containing [A-Za-z0-9_-].
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TEST_AND_RETURN_FALSE(!key.empty());
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for (size_t i = 0; i < key.size(); ++i) {
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char c = key.at(i);
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TEST_AND_RETURN_FALSE(base::IsAsciiAlpha(c) || base::IsAsciiDigit(c) ||
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c == '_' || c == '-');
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}
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*filename = prefs_dir_.Append(key);
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return true;
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}
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// MemoryPrefs
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bool MemoryPrefs::MemoryStorage::GetKey(const string& key,
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string* value) const {
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auto it = values_.find(key);
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if (it == values_.end())
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return false;
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*value = it->second;
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return true;
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}
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bool MemoryPrefs::MemoryStorage::SetKey(const string& key,
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const string& value) {
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values_[key] = value;
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return true;
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}
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bool MemoryPrefs::MemoryStorage::KeyExists(const string& key) const {
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return values_.find(key) != values_.end();
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}
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bool MemoryPrefs::MemoryStorage::DeleteKey(const string& key) {
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auto it = values_.find(key);
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if (it == values_.end())
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return false;
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values_.erase(it);
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return true;
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}
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} // namespace chromeos_update_engine
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