add CAA record on DNS

orchestra/contrib/domains/models.py

@@ -298,6 +298,7 @@ class Record(models.Model):
     TXT = 'TXT'
     SPF = 'SPF'
     SOA = 'SOA'
+    CAA = 'CAA'
 
     TYPE_CHOICES = (
         (MX, "MX"),
@@ -308,6 +309,7 @@ class Record(models.Model):
         (SRV, "SRV"),
         (TXT, "TXT"),
         (SPF, "SPF"),
+        (CAA, "CAA"),
     )
 
     VALIDATORS = {
@@ -320,6 +322,7 @@ class Record(models.Model):
         SPF: (validate_ascii, validators.validate_quoted_record),
         SRV: (validators.validate_srv_record,),
         SOA: (validators.validate_soa_record,),
+        CAA: (validators.validate_caa_record,),
     }
 
     domain = models.ForeignKey(Domain, verbose_name=_("domain"), related_name='records', on_delete=models.CASCADE)

orchestra/contrib/domains/validators.py

@@ -105,6 +105,28 @@ def validate_soa_record(value):
             raise ValidationError(msg)
 
 
+def validate_caa_record(value):
+    # 0-255 issue|issuewild|iodef "domain|mailto:email"
+    # 0 issue "letsewncript.org"
+    msg = _("%s is not an appropiate CAA record value, sintax: 0-255 issue|issuewild|iodef \"domain|mailto:email\"") % value
+    values = value.split()
+    if len(values) != 3:
+        raise ValidationError(msg)
+
+    patron_flag = r'^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$'
+    patron_tag = r'^(issue|issuewild|iodef)$'
+    patron_value_domain = r'^"[a-zA-Z0-9-.]+\.[a-zA-Z]+\.?"$'
+    patron_value_mailto = r'^"mailto:[a-zA-Z0-9.]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}"$'
+    flag = re.match(patron_flag, values[0])
+    tag =  re.match(patron_tag, values[1])
+    if values[1] == 'iodef':
+        valor = re.match(patron_value_mailto, values[2])
+    else:
+        valor = re.match(patron_value_domain, values[2])
+    if not (flag and tag and valor):
+        raise ValidationError(msg)
+        
+
 def validate_quoted_record(value):
     value = value.strip()
     if ' ' in value and (value[0] != '"' or value[-1] != '"'):