Fix TXT record parsing

TXT record validation fails to parse the record if it contains
spaces. Standard DNS part parser uses a space to divide record
parts. A special parser thus need to be implemented for this RR
type.

https://fedorahosted.org/freeipa/ticket/2306

ipalib/plugins/dns.py

@@ -1003,6 +1003,10 @@ class TXTRecord(DNSRecord):
         ),
     )
 
+    def _get_part_values(self, value):
+        # ignore any space in TXT record
+        return (value,)
+
 _dns_records = (
     ARecord(),
     AAAARecord(),
@@ -1536,6 +1540,8 @@ class dnsrecord(LDAPObject):
                             u'dnsdata' : dnsvalue
                     }
                     values = param._get_part_values(dnsvalue)
+                    if values is None:
+                        continue
                     for val_id, val in enumerate(values):
                         if val is not None:
                             dnsentry[parts_params[val_id].name] = val

tests/test_xmlrpc/test_dns_plugin.py

@@ -648,6 +648,24 @@ class test_dns(Declarative):
             },
         ),
 
+        dict(
+            desc='Add TXT record to %r using dnsrecord_add' % (dnsres1),
+            command=('dnsrecord_add', [dnszone1, dnsres1], {'txtrecord': u'foo bar' }),
+            expected={
+                'value': dnsres1,
+                'summary': None,
+                'result': {
+                    'objectclass': [u'top', u'idnsrecord'],
+                    'dn': unicode(dnsres1_dn),
+                    'idnsname': [dnsres1],
+                    'arecord': [u'10.10.0.1'],
+                    'cnamerecord': [u'foo-1.example.com.'],
+                    'kxrecord': [u'1 foo-1'],
+                    'txtrecord': [u'foo bar'],
+                },
+            },
+        ),
+
         dict(
             desc='Delete record %r in zone %r' % (dnsres1, dnszone1),
             command=('dnsrecord_del', [dnszone1, dnsres1], {'del_all': True }),