return upnp punch using secure xml library

fixes #105

requirements.txt

@@ -12,3 +12,4 @@ gevent-ws
 coincurve
 maxminddb
 rich
+defusedxml>=0.7

src/Peer/PeerPortchecker.py

@@ -28,8 +28,8 @@ class PeerPortchecker(object):
         return urllib.request.urlopen(req, timeout=20.0)
 
     def portOpen(self, port):
-        self.log.info("Not trying to open port using UpnpPunch until it's proven robust...")
-        return False
+        # self.log.info("Not trying to open port using UpnpPunch until it's proven robust...")
+        # return False
 
         try:
             UpnpPunch.ask_to_open_port(port, 'ZeroNet', retries=3, protos=["TCP"])
@@ -37,7 +37,6 @@ class PeerPortchecker(object):
         except Exception as err:
             self.log.warning("UpnpPunch run error: %s" % Debug.formatException(err))
             return False
-
         return True
 
     def portClose(self, port):

src/util/UpnpPunch.py

@@ -3,8 +3,7 @@ import urllib.request
 import http.client
 import logging
 from urllib.parse import urlparse
-from xml.dom.minidom import parseString
-from xml.parsers.expat import ExpatError
+from defusedxml.minidom import parseString
 
 from gevent import socket
 import gevent
@@ -105,7 +104,7 @@ def _parse_igd_profile(profile_xml):
     """
     try:
         dom = parseString(profile_xml)
-    except ExpatError as e:
+    except Exception as e:
         raise IGDError(
             'Unable to parse IGD reply: {0} \n\n\n {1}'.format(profile_xml, e))