initial commit from original sev version

internal/handlers/response.go

@@ -0,0 +1,24 @@
+package handlers
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+func WriteJSON(writer http.ResponseWriter, status int, payload any) {
+	writer.Header().Set("Content-Type", "application/json; charset=utf-8")
+	writer.WriteHeader(status)
+	_ = json.NewEncoder(writer).Encode(payload)
+}
+
+func WriteText(writer http.ResponseWriter, status int, message string) {
+	writer.Header().Set("Content-Type", "text/plain; charset=utf-8")
+	writer.WriteHeader(status)
+	_, _ = writer.Write([]byte(message))
+}
+
+func DecodeJSON(request *http.Request, target any) error {
+	decoder := json.NewDecoder(request.Body)
+	decoder.DisallowUnknownFields()
+	return decoder.Decode(target)
+}