added CORS

source/utils.hpp

@@ -0,0 +1,57 @@
+#ifndef UTILS_HPP
+#define UTILS_HPP
+
+#include <expected>
+#include <string>
+#include <cstdint>
+#include <filesystem>
+#include <expected>
+#include "json.hpp"
+#include "crow.h"
+
+namespace utils {
+    const std::filesystem::path build_dir = "frontend/build/"; // <-- set your build folder
+
+    std::map<std::string, std::string> parseBody(const std::string& body);
+
+    std::optional<std::string> getBodyName(const std::string& body);
+
+    std::expected<bool, std::string> isLocalPortOpen(uint16_t portno);
+
+    std::string to_id_format(const std::string& s);
+
+    std::string loadFile(const std::string& path);
+
+    std::filesystem::path getDataDir();
+
+    std::string urlDecode(const std::string& str);
+
+    std::string currentTime();
+
+    template<typename T>
+    std::string toJsonArray(const std::vector<T>& data){
+        nlohmann::json arr = nlohmann::json::array();
+        for (auto& c : data) {
+            arr.push_back(nlohmann::json(c));
+        }
+        return arr.dump();
+    } 
+
+    std::expected<nlohmann::json, std::string> parseJson(const std::string& input);
+
+
+    template <typename T>
+    std::expected<T, std::string> fromJson(const std::string& input) {
+    try {
+        return nlohmann::json::parse(input).get<T>();
+    }
+    catch (const nlohmann::json::exception& e) {
+        return std::unexpected(e.what());
+    }
+}
+
+std::string read_file(const std::string& path);
+crow::response getFile(const std::filesystem::path& file_path);
+}
+
+#endif