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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/json/values_util.h"
#include <optional>
#include "base/files/file_path.h"
#include "base/strings/string_number_conversions.h"
#include "base/time/time.h"
#include "base/unguessable_token.h"
// Warning: The Values involved could be stored on persistent storage like files
// on disks. Therefore, changes in implementation could lead to data corruption
// and must be done with caution.
namespace base {
namespace {
// Helper to serialize/deserialize an UnguessableToken.
//
// It assumes a little-endian CPU, which is arguably a bug.
union UnguessableTokenRepresentation {
struct Field {
uint64_t high;
uint64_t low;
} field;
uint8_t buffer[sizeof(Field)];
};
} // namespace
Value Int64ToValue(int64_t integer) {
return Value(NumberToString(integer));
}
std::optional<int64_t> ValueToInt64(const Value* value) {
return value ? ValueToInt64(*value) : std::nullopt;
}
std::optional<int64_t> ValueToInt64(const Value& value) {
if (!value.is_string()) {
return std::nullopt;
}
int64_t integer;
if (!StringToInt64(value.GetString(), &integer)) {
return std::nullopt;
}
return integer;
}
Value TimeDeltaToValue(TimeDelta time_delta) {
return Int64ToValue(time_delta.InMicroseconds());
}
std::optional<TimeDelta> ValueToTimeDelta(const Value* value) {
return value ? ValueToTimeDelta(*value) : std::nullopt;
}
std::optional<TimeDelta> ValueToTimeDelta(const Value& value) {
std::optional<int64_t> integer = ValueToInt64(value);
if (!integer) {
return std::nullopt;
}
return Microseconds(*integer);
}
Value TimeToValue(Time time) {
return TimeDeltaToValue(time.ToDeltaSinceWindowsEpoch());
}
std::optional<Time> ValueToTime(const Value* value) {
return value ? ValueToTime(*value) : std::nullopt;
}
std::optional<Time> ValueToTime(const Value& value) {
std::optional<TimeDelta> time_delta = ValueToTimeDelta(value);
if (!time_delta) {
return std::nullopt;
}
return Time::FromDeltaSinceWindowsEpoch(*time_delta);
}
Value FilePathToValue(const FilePath& file_path) {
return Value(file_path.AsUTF8Unsafe());
}
std::optional<FilePath> ValueToFilePath(const Value* value) {
return value ? ValueToFilePath(*value) : std::nullopt;
}
std::optional<FilePath> ValueToFilePath(const Value& value) {
if (!value.is_string()) {
return std::nullopt;
}
return FilePath::FromUTF8Unsafe(value.GetString());
}
Value UnguessableTokenToValue(UnguessableToken token) {
UnguessableTokenRepresentation repr;
repr.field.high = token.GetHighForSerialization();
repr.field.low = token.GetLowForSerialization();
return Value(HexEncode(repr.buffer, sizeof(repr.buffer)));
}
std::optional<UnguessableToken> ValueToUnguessableToken(const Value* value) {
return value ? ValueToUnguessableToken(*value) : std::nullopt;
}
std::optional<UnguessableToken> ValueToUnguessableToken(const Value& value) {
if (!value.is_string()) {
return std::nullopt;
}
UnguessableTokenRepresentation repr;
if (!HexStringToSpan(value.GetString(), repr.buffer)) {
return std::nullopt;
}
std::optional<base::UnguessableToken> token =
UnguessableToken::Deserialize(repr.field.high, repr.field.low);
if (!token.has_value()) {
return std::nullopt;
}
return token;
}
} // namespace base
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