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// Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "brillo/key_value_store.h"
#include <string>
#include <vector>
#include <base/check.h>
#include <base/files/file_util.h>
#include <base/files/important_file_writer.h>
#include <base/strings/string_split.h>
#include <base/strings/string_util.h>
#include <brillo/strings/string_utils.h>
#include <brillo/map_utils.h>
using std::string;
using std::vector;
namespace brillo {
namespace {
// Values used for booleans.
const char kTrueValue[] = "true";
const char kFalseValue[] = "false";
// Returns a copy of |key| with leading and trailing whitespace removed.
string TrimKey(const string& key) {
string trimmed_key;
base::TrimWhitespaceASCII(key, base::TRIM_ALL, &trimmed_key);
CHECK(!trimmed_key.empty());
return trimmed_key;
}
} // namespace
KeyValueStore::KeyValueStore() = default;
KeyValueStore::~KeyValueStore() = default;
KeyValueStore::KeyValueStore(KeyValueStore&&) = default;
KeyValueStore& KeyValueStore::operator=(KeyValueStore&&) = default;
bool KeyValueStore::Load(const base::FilePath& path) {
string file_data;
if (!base::ReadFileToString(path, &file_data))
return false;
return LoadFromString(file_data);
}
bool KeyValueStore::LoadFromString(const std::string& data) {
// Split along '\n', then along '='.
vector<string> lines = base::SplitString(data, "\n", base::KEEP_WHITESPACE,
base::SPLIT_WANT_ALL);
for (auto it = lines.begin(); it != lines.end(); ++it) {
std::string line;
base::TrimWhitespaceASCII(*it, base::TRIM_LEADING, &line);
if (line.empty() || line.front() == '#')
continue;
std::string key;
std::string value;
if (!string_utils::SplitAtFirst(line, "=", &key, &value, false))
return false;
base::TrimWhitespaceASCII(key, base::TRIM_TRAILING, &key);
if (key.empty())
return false;
// Append additional lines to the value as long as we see trailing
// backslashes.
while (!value.empty() && value.back() == '\\') {
++it;
if (it == lines.end() || it->empty())
return false;
value.pop_back();
value += *it;
}
store_[key] = value;
}
return true;
}
bool KeyValueStore::Save(const base::FilePath& path) const {
return base::ImportantFileWriter::WriteFileAtomically(path, SaveToString());
}
string KeyValueStore::SaveToString() const {
string data;
for (const auto& key_value : store_)
data += key_value.first + "=" + key_value.second + "\n";
return data;
}
void KeyValueStore::Clear() {
store_.clear();
}
bool KeyValueStore::GetString(const string& key, string* value) const {
const auto key_value = store_.find(TrimKey(key));
if (key_value == store_.end())
return false;
*value = key_value->second;
return true;
}
void KeyValueStore::SetString(const string& key, const string& value) {
store_[TrimKey(key)] = value;
}
bool KeyValueStore::GetBoolean(const string& key, bool* value) const {
string string_value;
if (!GetString(key, &string_value))
return false;
if (string_value == kTrueValue) {
*value = true;
return true;
} else if (string_value == kFalseValue) {
*value = false;
return true;
}
return false;
}
void KeyValueStore::SetBoolean(const string& key, bool value) {
SetString(key, value ? kTrueValue : kFalseValue);
}
std::vector<std::string> KeyValueStore::GetKeys() const {
return GetMapKeysAsVector(store_);
}
} // namespace brillo