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// Copyright 2022 Huawei Cloud Computing Technology Co., Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef INCLUDED_SRC_OTHER_TOOLS_CURL_EASY_HANDLE_HPP
#define INCLUDED_SRC_OTHER_TOOLS_CURL_EASY_HANDLE_HPP
#include <filesystem>
#include <functional>
#include <memory>
#include <optional>
#include "gsl-lite/gsl-lite.hpp"
#include "src/utils/cpp/curl_context.hpp"
extern "C" {
#if defined(BUILDING_LIBCURL) || defined(CURL_STRICTER)
using CURL = struct Curl_easy;
#else
using CURL = void;
#endif
}
void curl_easy_closer(gsl::owner<CURL*> curl);
class CurlEasyHandle {
public:
CurlEasyHandle() noexcept = default;
~CurlEasyHandle() noexcept = default;
// prohibit moves and copies
CurlEasyHandle(CurlEasyHandle const&) = delete;
CurlEasyHandle(CurlEasyHandle&& other) = delete;
auto operator=(CurlEasyHandle const&) = delete;
auto operator=(CurlEasyHandle&& other) = delete;
/// \brief Create a CurlEasyHandle object
[[nodiscard]] auto static Create() noexcept
-> std::shared_ptr<CurlEasyHandle>;
/// \brief Download file from URL into given file_path.
/// Will perform cleanup (i.e., remove empty file) in case download fails.
/// Returns 0 if successful.
[[nodiscard]] auto DownloadToFile(
std::string const& url,
std::filesystem::path const& file_path) noexcept -> int;
/// \brief Download file from URL into string as binary.
/// Returns the content or nullopt if download failure.
[[nodiscard]] auto DownloadToString(std::string const& url) noexcept
-> std::optional<std::string>;
private:
// IMPORTANT: the CurlContext must to be initialized before any curl object!
CurlContext curl_context_{};
std::unique_ptr<CURL, decltype(&curl_easy_closer)> handle_{
nullptr,
curl_easy_closer};
/// \brief Overwrites write_callback to redirrect to file instead of stdout.
[[nodiscard]] auto static EasyWriteToFile(gsl::owner<char*> data,
size_t size,
size_t nmemb,
gsl::owner<void*> userptr)
-> std::streamsize;
/// \brief Overwrites write_callback to redirect to string instead of
/// stdout.
[[nodiscard]] auto static EasyWriteToString(gsl::owner<char*> data,
size_t size,
size_t nmemb,
gsl::owner<void*> userptr)
-> std::streamsize;
};
#endif // INCLUDED_SRC_OTHER_TOOLS_CURL_EASY_HANDLE_HPP
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