Merge pull request #1163 from AdvanticGmbH/idna_decode

fix: use idna module to support extended character set

powerdnsadmin/lib/utils.py

@@ -4,6 +4,7 @@ import json
 import requests
 import hashlib
 import ipaddress
+import idna
 
 from collections.abc import Iterable
 from distutils.version import StrictVersion
@@ -248,10 +249,27 @@ def pretty_domain_name(value):
         if value.startswith('xn--') \
         or value.find('.xn--') != -1:
             try:
-                return value.encode().decode('idna')
+                return to_idna(value, 'decode')
             except:
-                raise Exception("Cannot decode IDN domain")
+                raise Exception('Cannot decode IDN domain')
         else:
             return value
     else:
-        raise Exception("Require the Punycode in string format")
+        raise Exception('Require the Punycode in string format')
+
+def to_idna(value, action):
+    splits = value.split()
+    result = []
+    if action == 'encode':
+        for split in splits:
+            try:
+                # Try encoding to idna
+                result.append(idna.encode(split).decode())
+            except idna.IDNAError:
+                result.append(split)
+    elif action == 'decode':
+        for split in splits:
+            result.append(idna.decode(split))   
+    else:
+        raise Exception('No valid action received')
+    return ' '.join(result)

powerdnsadmin/models/record.py

@@ -169,12 +169,12 @@ class Record(object):
             record['record_data'] = record['record_data'].replace('[ZONE]', domain_name)
             # Translate record name into punycode (IDN) as that's the only way
             # to convey non-ascii records to the dns server
-            record['record_name'] = record['record_name'].encode('idna').decode()
+            record['record_name'] = utils.to_idna(record["record_name"], "encode")
             #TODO: error handling
             # If the record is an alias (CNAME), we will also make sure that
             # the target domain is properly converted to punycode (IDN)
-            if record["record_type"] == 'CNAME':
+            if record['record_type'] == 'CNAME' or record['record_type'] == 'SOA':
-                record['record_data'] = record['record_data'].encode('idna').decode()
+                record['record_data'] = utils.to_idna(record['record_data'], 'encode')
                 #TODO: error handling
             # If it is ipv6 reverse zone and PRETTY_IPV6_PTR is enabled,
             # We convert ipv6 address back to reverse record format

powerdnsadmin/routes/domain.py

@@ -10,6 +10,7 @@ from flask_login import login_required, current_user, login_manager
 
 from ..lib.utils import pretty_domain_name
 from ..lib.utils import pretty_json
+from ..lib.utils import to_idna
 from ..decorators import can_create_domain, operator_role_required, can_access_domain, can_configure_dnssec, can_remove_domain
 from ..models.user import User, Anonymous
 from ..models.account import Account
@@ -379,7 +380,7 @@ def add():
 
             # Encode domain name into punycode (IDN)
             try:
-                domain_name = domain_name.encode('idna').decode()
+                domain_name = to_idna(domain_name, 'encode')
             except:
                 current_app.logger.error("Cannot encode the domain name {}".format(domain_name))
                 current_app.logger.debug(traceback.format_exc())