From c5e383b2955eec34aac6501f48c07976c5c06d60 Mon Sep 17 00:00:00 2001
From: Paul Cristian Sarbu <paul.cristian.sarbu@huawei.com>
Date: Wed, 28 Sep 2022 17:00:02 +0200
Subject: Utils: Add curl easy handle utility class

---
 src/utils/cpp/curl_easy_handle.hpp | 86 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 src/utils/cpp/curl_easy_handle.hpp

(limited to 'src/utils/cpp/curl_easy_handle.hpp')

diff --git a/src/utils/cpp/curl_easy_handle.hpp b/src/utils/cpp/curl_easy_handle.hpp
new file mode 100644
index 00000000..5f318887
--- /dev/null
+++ b/src/utils/cpp/curl_easy_handle.hpp
@@ -0,0 +1,86 @@
+// 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
\ No newline at end of file
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