Refactor - now wireguard based. (#7)

peer/json.go

@@ -0,0 +1,36 @@
+package peer
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+)
+
+func loadJSON(path string, target any) error {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return err
+	}
+	return json.Unmarshal(data, target)
+}
+
+func storeJSON(path string, obj any) error {
+	if err := os.MkdirAll(filepath.Dir(path), 0700); err != nil {
+		return err
+	}
+	data, err := json.MarshalIndent(obj, "", "  ")
+	if err != nil {
+		return err
+	}
+
+	tmpPath := path + ".tmp"
+	if err := os.WriteFile(tmpPath, data, 0600); err != nil {
+		return err
+	}
+
+	if err := os.Rename(tmpPath, path); err != nil {
+		os.Remove(tmpPath)
+		return err
+	}
+	return nil
+}