Add support for using TOML as configuration file format

Add basic support for trojan-grpc nodes.
Refactor codes.

src/server/webserver.h

@@ -3,8 +3,13 @@
 
 #include <string>
 #include <map>
+#include <atomic>
+#include <event2/http.h>
+#include <curl/curlver.h>
 
 #include "../utils/map_extra.h"
+#include "../utils/string.h"
+#include "../version.h"
 
 struct Request
 {
@@ -36,11 +41,40 @@ struct listener_args
     uint32_t looper_interval = 200;
 };
 
-void append_response(const std::string &method, const std::string &uri, const std::string &content_type, response_callback response);
-void append_redirect(const std::string &uri, const std::string &target);
-void reset_redirect();
-int start_web_server(void *argv);
-int start_web_server_multi(void *argv);
-void stop_web_server();
+struct responseRoute
+{
+    std::string method;
+    std::string path;
+    std::string content_type;
+    response_callback rc;
+};
+
+class WebServer
+{
+public:
+    std::string user_agent_str = "subconverter/" VERSION " cURL/" LIBCURL_VERSION;
+    std::atomic_bool SERVER_EXIT_FLAG{false};
+
+    // file server
+    bool serve_file = false;
+    std::string serve_file_root;
+
+    // basic authentication
+    bool require_auth = false;
+    std::string auth_user, auth_password, auth_realm = "Please enter username and password:";
+
+    void append_response(const std::string &method, const std::string &uri, const std::string &content_type, response_callback response);
+    void append_redirect(const std::string &uri, const std::string &target);
+    void reset_redirect();
+    int start_web_server(void *argv);
+    int start_web_server_multi(void *argv);
+    void stop_web_server();
+private:
+    int serveFile(const std::string &filename, std::string &content_type, std::string &return_data);
+    inline int process_request(Request &request, Response &response, std::string &return_data);
+    void on_request(evhttp_request *req, void *args);
+    std::vector<responseRoute> responses;
+    string_map redirect_map;
+};
 
 #endif // WEBSERVER_H_INCLUDED