-import re
-from ipaddress import IPv4Address, IPv6Address
-from typing import List, Dict, Any, Iterator
-
-
-second = 1
-minute = 60*second
-hour = 60*minute
-day = 24*hour
-week = 7*day
-
-def check_hostname(name: str) -> str:
- # check hostname for validity
- label = r'[a-zA-Z90-9]([a-zA-Z90-9-]{0,61}[a-zA-Z90-9])?' # must not start or end with hyphen
- pattern = r'^{0}(\.{0})*\.?'.format(label)
- if re.match(pattern, name):
- return name
- raise Exception(name+" is not a valid hostname")
-
-def abs_hostname(name: str, root: str = None) -> str:
- if name.endswith('.'):
- return name
- if root is None:
- raise Exception("Name {0} was expected to be absolute, but it is not".format(name))
- if not root.endswith('.'):
- raise Exception("Root {0} was expected to be absolute, but it is not".format(name))
- return name+"."+root
-
-def time(time: int) -> str:
- if time == 0:
- return "0"
- elif time % week == 0:
- return str(time//week)+"w"
- elif time % day == 0:
- return str(time//day)+"d"
- elif time % hour == 0:
- return str(time//hour)+"h"
- elif time % minute == 0:
- return str(time//minute)+"m"
- else:
- return str(time)
-
-class Address:
- # mypy does not know about the ipaddress types, so leave this class unannotated for now
- def __init__(self, IPv4 = None, IPv6 = None) -> None:
- self._IPv4 = None if IPv4 is None else IPv4Address(IPv4)
- self._IPv6 = None if IPv6 is None else IPv6Address(IPv6)
-
- def IPv4(self):
- return Address(IPv4 = self._IPv4)
-
- def IPv6(self):
- return Address(IPv6 = self._IPv6)
-
-class Name:
- def __init__(self, address: Address = None, MX: List = None,
- TCP: Dict[int, Any] = None, UDP: Dict[int, Any] = None) -> None:
- self._address = address
-
-class Service:
- def __init__(self, SRV: str = None, TLSA: str=None) -> None:
- self._SRV = None if SRV is None else check_hostname(SRV)
- self._TLSA = TLSA
-
-class CName:
- def __init__(self, name: str) -> None:
- self._name = check_hostname(name)
-
-class Delegation():
- def __init__(self, NS: str, DS: str = None) -> None:
- pass
-
-class RR():
- def __init__(self, owner: str, TTL: int, recordType: str, data: str) -> None:
- assert owner.endswith('.') # users have to make this absolute first
- self._owner = owner
- self._TTL = TTL
- self._recordType = recordType
- self._data = data
-
- def __str__(self) -> str:
- return "{0}\t{1}\t{2}\t{3}".format(self._owner, self._TTL, self._recordType, self._data)
-
-class Zone:
- def __init__(self, name: str, mail: str, NS: List[str],
- secondary_refresh: int, secondary_retry: int, secondary_expire: int,
- NX_TTL: int = None, A_TTL: int = None, other_TTL: int = None,
- domains: Dict[str, Any] = {}) -> None:
- self._name = check_hostname(name)
- if not mail.endswith('.'): raise Exception("Mail must be absolute, end with a dot")
- atpos = mail.find('@')
- if atpos < 0 or atpos > mail.find('.'): raise Exception("Mail must contain an @ before the first dot")
- self._mail = check_hostname(mail.replace('@', '.', 1))
- self._NS = list(map(check_hostname, NS))
-
- self._refresh = secondary_refresh
- self._retry = secondary_retry
- self._expire = secondary_expire
-
- assert other_TTL is not None
- self._NX_TTL = other_TTL if NX_TTL is None else NX_TTL
- self._A_TTL = other_TTL if A_TTL is None else A_TTL
- self._other_TTL = other_TTL
-
- def generate_rrs(self) -> Iterator[RR]:
- serial = -1
- yield (RR(abs_hostname(self._name), self._other_TTL, 'SOA',
- '{NS} {mail} ({serial} {refresh} {retry} {expire} {NX_TTL})'.format(
- NS=self._NS[0], mail=self._mail, serial=serial,
- refresh=time(self._refresh), retry=time(self._retry), expire=time(self._expire),
- NX_TTL=time(self._NX_TTL))
- ))
-
- def write(self, file:Any) -> None:
- for rr in self.generate_rrs():
- print(rr)