Prepare interface modularity

RNS/Interfaces/Interface.py

@@ -24,6 +24,7 @@ import RNS
 import time
 import threading
 from collections import deque
+from RNS.vendor.configobj import ConfigObj
 
 class Interface:
     IN  = False
@@ -238,4 +239,15 @@ class Interface:
                 RNS.log("The announce queue for this interface has been cleared.", RNS.LOG_ERROR)
 
     def detach(self):
-        pass
+        pass
+
+    @staticmethod
+    def get_config_obj(config_in):
+        if type(config_in) == ConfigObj:
+            return config_in
+        else:
+            try:
+                return ConfigObj(config_in)
+            except Exception as e:
+                RNS.log(f"Could not parse supplied configuration data. The contained exception was: {e}", RNS.LOG_ERROR)
+                raise SystemError("Invalid configuration data supplied")