lib/forms_extends.py

from django.forms import fields

try:
    from django.conf import settings
    URL_VALIDATOR_USER_AGENT = settings.URL_VALIDATOR_USER_AGENT
except ImportError:
    # It's OK if Django settings aren't configured.
    URL_VALIDATOR_USER_AGENT = 'Django (http://www.djangoproject.com/)'

ipv4_re = re.compile(r'^(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}$')
url_re = re.compile(
    r'(?:(?:[A-Z0-9-]+\.)+[A-Z]{2,6}|' #domain...
    r'localhost|' #localhost...
    r'\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})' # ...or ip
    r'(?::\d+)?' # optional port
    r'(?:/?|/\S+)$', re.IGNORECASE)

class IPorURLField(fields.IPAddressField, fields.URLField, RegexField):
    default_error_messages = {
        'invalid': _(u'Enter a valid IPv4 or URL address.'),
        'invalid_link': _(u'This URL appears to be a broken link.'),
    }

    def __init__(self, max_length=None, min_length=None, verify_exists=False,
            validator_user_agent=URL_VALIDATOR_USER_AGENT, *args, **kwargs):
        super(IPAddressField, self).__init__(ipv4_re, *args, **kwargs)
        super(URLField, self).__init__(url_re, max_length, min_length, *args,
                                       **kwargs)
        self.verify_exists = verify_exists
        self.user_agent = validator_user_agent
        
    def clean(self, value):
        # If no URL scheme given, assume http://
        if value and '://' not in value:
            value = u'http://%s' % value
        # If no URL path given, assume /
        if value and not urlparse.urlsplit(value)[2]:
            value += '/'
        value = super(URLField, self).clean(value)
        if value == u'':
            return value
        if self.verify_exists:
            import urllib2
            headers = {
                "Accept": "text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5",
                "Accept-Language": "en-us,en;q=0.5",
                "Accept-Charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.7",
                "Connection": "close",
                "User-Agent": self.user_agent,
            }
            try:
                req = urllib2.Request(value, None, headers)
                u = urllib2.urlopen(req)
            except ValueError:
                raise ValidationError(self.error_messages['invalid'])
            except: # urllib2.URLError, httplib.InvalidURL, etc.
                raise ValidationError(self.error_messages['invalid_link'])
        return value



lib/models_extends.py

from django.db.models.fields import URLField, IPAddressField

class IPorURLField(IPAddressField, URLField):
    empty_strings_allowed = False
    def __init__(self, verbose_name=None, name=None, verify_exists=True, **kwargs):
        kwargs['max_length'] = kwargs.get('max_length', 200)
        #IPorURLField.__init__(self, verbose_name, name, **kwargs)

    def get_internal_type(self):
        return "IPorURLAddressField"

    def formfield(self, **kwargs):
        defaults = {'form_class': forms.IPorURLField}
        defaults.update(kwargs)
        return super(IPorURLAddressField, self).formfield(**defaults)