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IPAddressField with CIDR support

Author:
SeniorHuevo
Posted:
March 17, 2010
Language:
Python
Version:
1.1
Score:
1 (after 1 ratings)

Based on #1381

Use this piece of code to add IPv4/IPv6 and network support to Django.

An IPAddressField allows you to find IP's for a given subnet. An IPNetworkField allows you to find a subnet for a given IP or find a subnet within a subnet.

For starters, simply paste it into a new file in your app called fields.py.

IPAddressField example

# models.py
from fields import IPAddressField

class IPTest(models.Model):
    ip = IPAddressField()

To search for an IP within a given subnet

from ipaddr import IPNetwork
IPTest.objects.filter(ip__in=IPNetwork('10.0.0.0/24'))

IPNetworkField example

 # models.py
 from fields import IPNetworkField,  IPNetworkQuerySet

 class IPTest(models.Model):
     objects = IPNetworkQuerySet.as_manager()
     network = IPNetworkField()

To search for a subnet with a given IP

from ipaddr import IPAddress
IPTest.objects.network('network', IPAddress('10.0.0.1'))
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from ipaddr import _IPAddrBase, IPAddress, IPNetwork

from django.forms import ValidationError as FormValidationError
from django.core.exceptions import ValidationError
from django.forms import fields, widgets
from django.db import models

class IPNetworkWidget(widgets.TextInput):
    def render(self, name, value, attrs=None):
        if isinstance(value, _IPAddrBase):
            value = u'%s' % value
        return super(IPNetworkWidget, self).render(name, value, attrs)

class IPNetworkManager(models.Manager):
    use_for_related_fields = True

    def __init__(self, qs_class=models.query.QuerySet):
        self.queryset_class = qs_class
        super(IPNetworkManager, self).__init__()

    def get_query_set(self):
        return self.queryset_class(self.model)

    def __getattr__(self, attr, *args):
        try:
            return getattr(self.__class__, attr, *args)
        except AttributeError:
            return getattr(self.get_query_set(), attr, *args)

class IPNetworkQuerySet(models.query.QuerySet):   

    net = None

    def network(self, key, value):
        if not isinstance(value, _IPAddrBase):
            value = IPNetwork(value)
        self.net = (key, value)
        return self

    def iterator(self):
        for obj in super(IPNetworkQuerySet, self).iterator():
            try:
                net = IPNetwork(getattr(obj, self.net[0]))   
            except (ValueError, TypeError):
                pass
            else:
                if not self.net[1] in net:
                   continue
            yield obj
            
    @classmethod
    def as_manager(cls, ManagerClass=IPNetworkManager):
        return ManagerClass(cls)

class IPNetworkField(models.Field):
    __metaclass__ = models.SubfieldBase
    description = "IP Network Field with CIDR support"
    empty_strings_allowed = False
    
    def db_type(self, connection):
        return 'varchar(45)'

    def to_python(self, value):
        if not value:
            return None

        if isinstance(value, _IPAddrBase):
            return value

        try:
            return IPNetwork(value.encode('latin-1'))
        except Exception, e:
            raise ValidationError(e)

    def get_prep_lookup(self, lookup_type, value):
        if lookup_type == 'exact':
            return self.get_prep_value(value)
        elif lookup_type == 'in':
            return [self.get_prep_value(v) for v in value]           
        else:
            raise TypeError('Lookup type %r not supported.' \
                % lookup_type)

    def get_prep_value(self, value):
        if isinstance(value, _IPAddrBase):
            value = '%s' % value
        return unicode(value)
      
    def formfield(self, **kwargs):
        defaults = {
            'form_class' : fields.CharField,
            'widget': IPNetworkWidget,
        }
        defaults.update(kwargs)
        return super(IPNetworkField, self).formfield(**defaults)
 
class IPAddressField(models.Field):
    __metaclass__ = models.SubfieldBase
    description = "IP Address Field with IPv6 support"
    
    def db_type(self, connection):
        return 'varchar(42)'

    def to_python(self, value):
        if not value:
            return None

        if isinstance(value, _IPAddrBase):
            return value

        try:
            return IPAddress(value.encode('latin-1'))
        except Exception, e:
            raise ValidationError(e)

    def get_prep_lookup(self, lookup_type, value):
        if lookup_type == 'exact':
            return self.get_prep_value(value)
        elif lookup_type == 'in':
            return [self.get_prep_value(v) for v in value]           
        else:
            raise TypeError('Lookup type %r not supported.' \
                % lookup_type)

    def get_prep_value(self, value):
        if isinstance(value, _IPAddrBase):
            value = '%s' % value
        return unicode(value)
      
    def formfield(self, **kwargs):
        defaults = {
            'form_class' : fields.CharField,
            'widget': IPNetworkWidget,
        }
        defaults.update(kwargs)
        return super(IPAddressField, self).formfield(**defaults)
 

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