Fixed Python zone migration script

migrateZone.py

import dns.zone
from dns.zone import NoSOA
from dns.exception import DNSException
from dns.rdataclass import *
from dns.rdatatype import *
from dns import rdatatype
import httplib2
import json
import sys

from apiclient.discovery import build

from oauth2client.client import SignedJwtAssertionCredentials

# Update SERVICE_ACCOUNT_EMAIL with the email address of the service account for
# the client id created in the developer console.
SERVICE_ACCOUNT_EMAIL = 'set-me@developer.gserviceaccount.com'

# Update SERVICE_ACCOUNT_PKCS12_FILE_PATH with the file path to the private key
# file downloaded from the developer console.
SERVICE_ACCOUNT_PKCS12_FILE_PATH = 'set-me.p12'

# Scopes for access to data.
SCOPES = ['https://www.googleapis.com/auth/ndev.clouddns.readwrite']

# See https://developers.google.com/dns/what-is-cloud-dns#supported_record_types
SUPPORTED_RECORD_TYPES = [A, AAAA, CNAME, MX, PTR, SPF, SRV, TXT, DS]

def parseZone():
  jsonOutput = {}
  additions = []

  zone_file = '%s.zone' % domain

  try:
    zone = dns.zone.from_file(zone_file, domain)

    for name, node in zone.nodes.items():
      rdatasets = node.rdatasets

      for rdataset in rdatasets:

        api_name = qualifyName(name)

        if rdataset.rdtype in SUPPORTED_RECORD_TYPES:
          addition = {
                      'name' : api_name,
                      'ttl' : str(rdataset.ttl),
                      'type' : rdatatype.to_text(rdataset.rdtype),
                      'kind' : 'dns#resourceRecordSet'
                      }
        elif rdataset.rdtype in [SOA,NS]:
          # Skip the SOA and NS records in this example. The
          # SOA record is generated as part of the managed zone
          # the NS records here aren't applicable because this
          # zone is using Google Cloud DNS rather than providing
          # its own name servers
          # In your situation, you might want to keep the NS
          # records, if so add them to the SUPPORTED_RECORD_TYPES
          continue

        # Array of records for this name/type combination
        rrdatas = []

        for rdata in rdataset:
          if rdataset.rdtype == MX:
            rrdatas.append('%s %s' % (rdata.preference, qualifyName(rdata.exchange)))
          if rdataset.rdtype == CNAME:
            rrdatas.append(qualifyName(rdata.target))
          if rdataset.rdtype == A:
            rrdatas.append(rdata.address)
          if rdataset.rdtype == TXT:
            rrdatas.append(rdata.strings[0])
          if rdataset.rdtype == SRV:
            rrdatas.append(str(rdata.priority) + " " + str(rdata.weight) + " " + str(rdata.port) + " " + qualifyName(rdata.target))

        addition.update({'rrdatas' : rrdatas})
        additions.append(addition)

    jsonOutput.update({'additions' : additions })
    return jsonOutput

  except DNSException, e:
    if e.__class__ is NoSOA:
      print ('Check that your SOA line starts with a qualified domain and is in the form of: \n')
      print ('  example.com. IN      SOA     ns1.example.com. hostmaster.example.com. (')
    print e.__class__, e

def qualifyName(dnsName):
  dnsName = str(dnsName)
  if dnsName.endswith("."):
    return dnsName
  if domain not in dnsName and dnsName != '@':
    return dnsName + '.' + domain + '.'
  else:
    # Catches the @ symbol case too.
    return domain + '.'

def authenticate():
  """Build and return a DNS service object authorized with the
  service accounts that act on behalf of the given user.

  Returns:
    DNS service object.
  """

  f = open(SERVICE_ACCOUNT_PKCS12_FILE_PATH, 'rb')
  key = f.read()
  f.close()

  # Setting the sub field with USER_EMAIL allows you to make API calls using the
  # special keyword 'me' in place of a user id for that user.
  credentials = SignedJwtAssertionCredentials(
      SERVICE_ACCOUNT_EMAIL,
      key,
      scope=SCOPES)
  http = httplib2.Http()
  http = credentials.authorize(http)

  # Create and return the DNS service object
  return build('dns', 'v1beta1', http=http)

def createZone(service):
  body = {
    'name' : domain.replace('.', '-'),
    'dnsName' : domain + '.',
    'description' : 'A generated zone for ' + domain
  }
  args = { 'project' : project, 'body' : body }

  try:
    response = service.managedZones().create(**args).execute()
    return response['name']
  except:
    if 'already exists' in str(sys.exc_info()):
      print('Zone already exists, moving on.')
      return domain.replace('.','-')
    else:
      print str(sys.exc_info())
      exit()

def createRecords(service, zone_name, records):
  args = {
    'project' : project,
    'managedZone' : zone_name,
    'body' : records
  }
  try:
    print json.dumps(args,
                    sort_keys=True,
                    indent=4,
                    separators=(',', ': '))
    response = service.changes().create(**args).execute()
    print 'Record set created, result object: '
    print json.dumps(response,
                    sort_keys=True,
                    indent=4,
                    separators=(',', ': '))
  except:
    print str(sys.exc_info())
    exit()

if __name__ == '__main__':
    if len(sys.argv) > 2:
      project = sys.argv[1]
      domain = sys.argv[2]
      service = authenticate()
      records = parseZone()
      zone_name = createZone(service)
      createRecords(service, zone_name, records)
    else:
      print ('Missing arguments. Provide both the Developer Console project ID'
             'and domain name. ')
      print ('Usage: migrateZone.py console-project-name example.com')