some refactoring

server/Configure.go

@@ -0,0 +1,12 @@
+package server
+
+import (
+	"dns_service/api"
+	"net/http"
+)
+
+func Configure() {
+	http.Handle("/", api.SpaHandler(http.FS(api.Frontend)))
+	http.HandleFunc("/api/settings", api.Settings)
+	http.HandleFunc("/api/settings/file", api.SettingsFile)
+}

server/Run.go

@@ -0,0 +1,29 @@
+package server
+
+import (
+	"log"
+	"net/http"
+	"os"
+)
+
+func Run() {
+	if os.Getenv("ENABLE_TLS") == "true" {
+		err := http.ListenAndServeTLS(
+			os.Getenv("SERVER_ADDRESS")+":"+os.Getenv("SERVER_PORT"),
+			os.Getenv("CERT_FILE"),
+			os.Getenv("KEY_FILE"),
+			nil,
+		)
+		if err != nil {
+			log.Fatal(err)
+		}
+	} else {
+		err := http.ListenAndServe(
+			os.Getenv("SERVER_ADDRESS")+":"+os.Getenv("SERVER_PORT"),
+			nil,
+		)
+		if err != nil {
+			log.Fatal(err)
+		}
+	}
+}