add DKIM helper

[zonemaker.git] / zone.py

diff --git a/zone.py b/zone.py
index d7c23ff2506858d91b648a121c4b7321676a252b..dce8b43b1dcde9115de827de1d9afef8651a093b 100644 (file)
--- a/zone.py
+++ b/zone.py
@@ -134,6 +134,39 @@ class MX:
         return zone.RR(owner, 'MX', '{0} {1}'.format(self._priority, zone.abs_hostname(self._name)))
 
 
+class TXT:
+    def __init__(self, text: str) -> None:
+        # test for bad characters
+        for c in ('\n', '\r', '\t'):
+            if c in text:
+                raise Exception("TXT record {0} contains invalid character")
+        # escape text
+        for c in ('\\', '\"'):
+            text = text.replace(c, '\\'+c)
+        self._text = text
+    
+    def generate_rr(self, owner:str, zone: 'Zone') -> 'Any':
+        return zone.RR(owner, 'TXT', '"{0}"'.format(self._text))
+
+
+class DKIM(TXT): # helper class to treat DKIM more antively
+    class Version:
+        DKIM1 = "DKIM1"
+    
+    class Algorithm:
+        RSA = "rsa"
+    
+    def __init__(self, selector, version, alg, key):
+        self._selector = check_label(selector)
+        version = check_label(version)
+        alg = check_label(alg)
+        key = check_key(key)
+        super(self).__init__("v={0}; k={1}; p={2}".format(version, alg, key))
+    
+    def generate_rr(self, owner, zone):
+        return super(self).generate_rr('{0}._domainkey.{1}'.format(self._selector, owner), zone)
+
+
 class SRV:
     def __init__(self, protocol: str, service: str, name: str, port: int, prio: int, weight: int) -> None:
         self._service = check_label(service)