web: model: Host: Add validation properties

src/rouse/web/model.py

@@ -1,6 +1,8 @@
 from __future__ import unicode_literals
 from sqlalchemy import schema, types, orm
 from sqlalchemy.ext import declarative
+import re
+import socket
 
 
 Base = declarative.declarative_base()
@@ -27,9 +29,54 @@ class Serializable(object):
 
 class Host(Base, Serializable):
 
+    HOSTNAME_RE = re.compile(
+        r'^(?=.{1,255}$)(?:(?!-)[a-zA-Z0-9-]{1,63}(?<!-)\.)*'
+        r'(?![0-9]+$)(?!-)[a-zA-Z0-9-]{1,63}(?<!-)\.?$'
+    )
+    MACADDR_RE = re.compile(
+        r'(([0-9a-f]{2}[:-]){5}[0-9a-f]{2})|'
+        r'(([0-9a-f]{4}\.){2}[0-9a-f]{4})',
+        re.IGNORECASE
+    )
     __tablename__ = 'hosts'
 
     id = schema.Column(types.Integer, autoincrement=True, primary_key=True)
-    macaddr = schema.Column(types.String(18), nullable=False)
-    ipaddr = schema.Column(types.String(46))
-    hostname = schema.Column(types.Unicode(253))
+    _macaddr = schema.Column('macaddr', types.String(18), nullable=False)
+    _ipaddr = schema.Column('ipaddr', types.String(46))
+    _hostname = schema.Column('hostname', types.Unicode(253))
+
+    @property
+    def macaddr(self):
+        return self._macaddr
+
+    @macaddr.setter
+    def macaddr(self, value):
+        if not self.MACADDR_RE.match(value):
+            raise ValueError('Invalid MAC address: {}'.format(value))
+        self._macaddr = value
+
+    @property
+    def ipaddr(self):
+        return self._ipaddr
+
+    @ipaddr.setter
+    def ipaddr(self, value):
+        if ':' in value:
+            af = socket.AF_INET6
+        else:
+            af = socket.AF_INET
+        try:
+            packed = socket.inet_pton(af, value)
+        except socket.error as e:
+            raise ValueError('{}: {}'.format(e, value))
+        self._ipaddr = socket.inet_ntop(af, packed)
+
+    @property
+    def hostname(self):
+        return self._hostname
+
+    @hostname.setter
+    def hostname(self, value):
+        if not self.HOSTNAME_RE.match(value):
+            raise ValueError('Invalid hostname: {}'.format(value))
+        self._hostname = value