start actually writing something

[zonemaker.git] / zonemaker / zone.py

diff --git a/zonemaker/zone.py b/zonemaker/zone.py
index 63195050780d58b1581adbf9a6dbdf9749b28c50..c30cab165b996399a157ba1aa045ac3a61b7a75a 100644 (file)
--- a/zonemaker/zone.py
+++ b/zonemaker/zone.py
@@ -1,12 +1,50 @@
+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:
-    def __init__(self, IPv4 = None, IPv6 = None):
-        self._IPv4 = IPv4
-        self._IPv6 = IPv6
+    # 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)
@@ -15,28 +53,64 @@ class Address:
         return Address(IPv6 = self._IPv6)
 
 class Name:
-    def __init__(self, address = None, MX = None, TCP = None, UDP = None):
+    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 = None, TLSA=None):
-        self._SRV = SRV
+    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):
-        self._name = name
+    def __init__(self, name: str) -> None:
+        self._name = check_hostname(name)
 
 class Delegation():
-    def __init__(self, NS, DS = None):
+    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, mail, NS,
-                 secondary_refresh, secondary_retry, secondary_discard,
-                 NX_TTL = None, A_TTL = None, other_TTL = None,
-                 domains = []):
+    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)