fix Signer.encode() to take an argument

autovpn/vpn_app.py

@@ -169,8 +169,7 @@ class Signer(object):
             self.l.signer = itsdangerous.URLSafeTimedSerializer(self.secret, salt='cn')
         return self.l.signer
 
-    def encode(self):
-        cn = str(uuid.uuid4())
+    def encode(self, cn):
         return self._signer().dumps(cn)
 
     def decode(self, token):