90 lines
2.2 KiB
C++
90 lines
2.2 KiB
C++
/*
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* Copyright (C) 2020 Emeric Poupon
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*
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* This file is part of LMS.
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*
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* LMS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* LMS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with LMS. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "utils/UUID.hpp"
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#include <cassert>
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#include <iomanip>
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#include <regex>
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#include <sstream>
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#include "utils/Random.hpp"
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#include "utils/String.hpp"
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namespace StringUtils
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{
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template <>
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std::optional<UUID>
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readAs(std::string_view str)
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{
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return UUID::fromString(str);
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}
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}
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namespace
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{
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bool stringIsUUID(std::string_view str)
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{
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static const std::regex re{ R"([0-9a-fA-F]{8}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{12})" };
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return std::regex_match(std::cbegin(str), std::cend(str), re);
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}
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}
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UUID::UUID(std::string_view str)
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: _value{ StringUtils::stringToLower(str) }
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{
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}
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std::optional<UUID> UUID::fromString(std::string_view str)
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{
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if (!stringIsUUID(str))
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return std::nullopt;
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return UUID{ str };
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}
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UUID UUID::generate()
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{
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// Form is "123e4567-e89b-12d3-a456-426614174000"
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// TODO: store 128 bits and only convert to string when necessary
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std::ostringstream oss;
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auto concatRandomBytes{ [](std::ostream& os, std::size_t byteCount)
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{
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for (std::size_t i {}; i < byteCount; ++i)
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os << std::hex << std::setfill('0') << std::setw(2) << static_cast<int>(Random::getRandom<std::uint8_t>(0, 255));
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} };
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concatRandomBytes(oss, 4);
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oss << "-";
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concatRandomBytes(oss, 2);
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oss << "-";
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concatRandomBytes(oss, 2);
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oss << "-";
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concatRandomBytes(oss, 2);
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oss << "-";
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concatRandomBytes(oss, 6);
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const auto uuid{fromString(oss.str())};
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assert(uuid);
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return uuid.value();
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}
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