add HTTP server

src/HTTPServer.hh

@@ -0,0 +1,62 @@
+#pragma once
+
+#include <event2/buffer.h>
+#include <event2/event.h>
+#include <event2/http.h>
+#include <stdlib.h>
+
+#include <memory>
+#include <string>
+
+#include "ProxyServer.hh"
+#include "ServerState.hh"
+
+class HTTPServer {
+public:
+  HTTPServer(std::shared_ptr<ServerState> state);
+  HTTPServer(const HTTPServer&) = delete;
+  HTTPServer(HTTPServer&&) = delete;
+  HTTPServer& operator=(const HTTPServer&) = delete;
+  HTTPServer& operator=(HTTPServer&&) = delete;
+  virtual ~HTTPServer() = default;
+
+  void listen(const std::string& socket_path);
+  void listen(const std::string& addr, int port);
+  void listen(int port);
+  void add_socket(int fd);
+
+protected:
+  class http_error : public std::runtime_error {
+  public:
+    http_error(int code, const std::string& what);
+    int code;
+  };
+
+  std::shared_ptr<ServerState> state;
+  std::shared_ptr<struct evhttp> http;
+
+  static void dispatch_handle_request(struct evhttp_request* req, void* ctx);
+  void handle_request(struct evhttp_request* req);
+
+  static const std::unordered_map<int, const char*> explanation_for_response_code;
+  static void send_response(struct evhttp_request* req, int code, const char* content_type, struct evbuffer* b);
+  static void send_response(struct evhttp_request* req, int code, const char* content_type, const char* fmt, ...);
+
+  static std::unordered_multimap<std::string, std::string> parse_url_params(const std::string& query);
+  static std::unordered_map<std::string, std::string> parse_url_params_unique(const std::string& query);
+  static const std::string& get_url_param(
+      const std::unordered_multimap<std::string, std::string>& params,
+      const std::string& key,
+      const std::string* _default = nullptr);
+
+  JSON generate_client_config_json(const Client::Config& config) const;
+  JSON generate_license_json(std::shared_ptr<const License> l) const;
+  JSON generate_game_client_json(std::shared_ptr<const Client> c) const;
+  JSON generate_proxy_client_json(std::shared_ptr<const ProxyServer::LinkedSession> ses) const;
+  JSON generate_lobby_json(std::shared_ptr<const Lobby> l) const;
+  JSON generate_game_server_clients_json() const;
+  JSON generate_proxy_server_clients_json() const;
+  JSON generate_lobbies_json() const;
+  JSON generate_summary_json() const;
+  JSON generate_all_json() const;
+};