New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/platform/http_request.hpp

@@ -0,0 +1,65 @@
+#pragma once
+
+#include "platform/downloader_defines.hpp"
+
+#include <cstdint>
+#include <functional>
+#include <string>
+#include <utility>
+#include <vector>
+
+namespace downloader
+{
+namespace non_http_error_code
+{
+auto constexpr kIOException = -1;
+auto constexpr kWriteException = -2;
+auto constexpr kInconsistentFileSize = -3;
+auto constexpr kNonHttpResponse = -4;
+auto constexpr kInvalidURL = -5;
+auto constexpr kCancelled = -6;
+}  // namespace non_http_error_code
+
+/// Request in progress will be canceled on delete
+class HttpRequest
+{
+public:
+  using Callback = std::function<void(HttpRequest & request)>;
+
+protected:
+  DownloadStatus m_status;
+  Progress m_progress;
+  Callback m_onFinish;
+  Callback m_onProgress;
+
+  HttpRequest(Callback && onFinish, Callback && onProgress);
+
+public:
+  virtual ~HttpRequest() = 0;
+
+  DownloadStatus GetStatus() const { return m_status; }
+  Progress const & GetProgress() const { return m_progress; }
+  /// Either file path (for chunks) or downloaded data
+  virtual std::string const & GetData() const = 0;
+
+  /// Response saved to memory buffer and retrieved with Data()
+  static HttpRequest * Get(std::string const & url,
+                           Callback && onFinish,
+                           Callback && onProgress = Callback());
+
+  /// Content-type for request is always "application/json"
+  static HttpRequest * PostJson(std::string const & url, std::string const & postData,
+                                Callback && onFinish,
+                                Callback && onProgress = Callback());
+
+  /// Download file to filePath.
+  /// Pulls chunks simultaneously from all available servers, 1 thread per server.
+  /// @param[in]  fileSize  Correct file size (needed for resuming and reserving).
+  static HttpRequest * GetFile(std::vector<std::string> const & urls,
+                               std::string const & filePath, int64_t fileSize,
+                               Callback && onFinish,
+                               Callback && onProgress = Callback(),
+                               int64_t chunkSize = 0, // 0 for auto
+                               bool doCleanOnCancel = true);
+};
+} // namespace downloader