fields.py
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# Copyright 2014 Budapest University of Technology and Economics (BME IK)
#
# This file is part of CIRCLE Cloud.
#
# CIRCLE is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# CIRCLE is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along
# with CIRCLE. If not, see <http://www.gnu.org/licenses/>.
from django.core.exceptions import ValidationError
from django.db import models
from django.utils.translation import ugettext_lazy as _
from django.utils.ipv6 import is_valid_ipv6_address
from south.modelsinspector import add_introspection_rules
from django import forms
from netaddr import (IPAddress, IPNetwork, AddrFormatError, ZEROFILL,
EUI, mac_unix)
import re
alfanum_re = re.compile(r'^[A-Za-z0-9_-]+$')
domain_re = re.compile(r'^([A-Za-z0-9_-]\.?)+$')
domain_wildcard_re = re.compile(r'^(\*\.)?([A-Za-z0-9_-]\.?)+$')
ipv4_re = re.compile('^([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)$')
reverse_domain_re = re.compile(r'^(%\([abcd]\)d|[a-z0-9.-])+$')
ipv6_template_re = re.compile(r'^(%\([abcd]\)[dxX]|[A-Za-z0-9:-])+$')
class MACAddressFormField(forms.Field):
default_error_messages = {
'invalid': _(u'Enter a valid MAC address. %s'),
}
def validate(self, value):
try:
return MACAddressField.to_python.im_func(None, value)
except (AddrFormatError, TypeError, ValidationError) as e:
raise ValidationError(self.default_error_messages['invalid']
% unicode(e))
class MACAddressField(models.Field):
description = _('MAC Address object')
__metaclass__ = models.SubfieldBase
class mac_custom(mac_unix):
word_fmt = '%.2X'
def __init__(self, *args, **kwargs):
kwargs['max_length'] = 17
super(MACAddressField, self).__init__(*args, **kwargs)
def to_python(self, value):
if not value:
return None
if isinstance(value, EUI):
return value
return EUI(value, dialect=MACAddressField.mac_custom)
def get_internal_type(self):
return 'CharField'
def get_prep_value(self, value, prepared=False):
if not value:
return None
if isinstance(value, EUI):
return str(value)
return value
def formfield(self, **kwargs):
defaults = {'form_class': MACAddressFormField}
defaults.update(kwargs)
return super(MACAddressField, self).formfield(**defaults)
class IPAddressFormField(forms.Field):
default_error_messages = {
'invalid': _(u'Enter a valid IP address. %s'),
}
def validate(self, value):
try:
IPAddressField(version=self.version).to_python(value)
except (AddrFormatError, TypeError, ValueError) as e:
raise ValidationError(self.default_error_messages['invalid']
% unicode(e))
def __init__(self, *args, **kwargs):
self.version = kwargs['version']
del kwargs['version']
super(IPAddressFormField, self).__init__(*args, **kwargs)
class IPAddressField(models.Field):
description = _('IP Network object')
__metaclass__ = models.SubfieldBase
def __init__(self, version=4, serialize=True, *args, **kwargs):
kwargs['max_length'] = 100
self.version = version
super(IPAddressField, self).__init__(*args, **kwargs)
def get_internal_type(self):
return "CharField"
def to_python(self, value):
if not value:
return None
if isinstance(value, IPAddress):
return value
return IPAddress(value.split('/')[0], version=self.version,
flags=ZEROFILL)
def get_prep_value(self, value, prepared=False):
if not value:
return None
if isinstance(value, IPAddress):
if self.version == 4:
return '.'.join("%03d" % x for x in value.words)
else:
return ':'.join("%04X" % x for x in value.words)
return value
def formfield(self, **kwargs):
defaults = {'form_class': IPAddressFormField}
defaults['version'] = self.version
defaults.update(kwargs)
return super(IPAddressField, self).formfield(**defaults)
class IPNetworkFormField(forms.Field):
default_error_messages = {
'invalid': _(u'Enter a valid IP network. %s'),
}
def validate(self, value):
try:
return IPNetworkField(version=self.version).to_python(value)
except (AddrFormatError, TypeError) as e:
raise ValidationError(self.default_error_messages['invalid']
% unicode(e))
def __init__(self, *args, **kwargs):
self.version = kwargs['version']
del kwargs['version']
super(IPNetworkFormField, self).__init__(*args, **kwargs)
class IPNetworkField(models.Field):
description = _('IP Network object')
__metaclass__ = models.SubfieldBase
def __init__(self, version=4, serialize=True, *args, **kwargs):
kwargs['max_length'] = 100
self.version = version
super(IPNetworkField, self).__init__(*args, **kwargs)
def to_python(self, value):
if not value:
return None
if isinstance(value, IPNetwork):
return value
return IPNetwork(value, version=self.version)
def get_internal_type(self):
return "CharField"
def get_prep_value(self, value, prepared=False):
if not value:
return None
if isinstance(value, IPNetwork):
if self.version == 4:
return ('.'.join("%03d" % x for x in value.ip.words)
+ '/%02d' % value.prefixlen)
else:
return (':'.join("%04X" % x for x in value.ip.words)
+ '/%03d' % value.prefixlen)
return value
def formfield(self, **kwargs):
defaults = {'form_class': IPNetworkFormField}
defaults['version'] = self.version
defaults.update(kwargs)
return super(IPNetworkField, self).formfield(**defaults)
add_introspection_rules([], ["firewall\.fields\."])
def val_alfanum(value):
"""Validate whether the parameter is a valid alphanumeric value."""
if not alfanum_re.match(value):
raise ValidationError(_(u'%s - only letters, numbers, underscores '
'and hyphens are allowed!') % value)
def is_valid_domain(value):
"""Check whether the parameter is a valid domain name."""
return domain_re.match(value) is not None
def is_valid_domain_wildcard(value):
"""Check whether the parameter is a valid domain name."""
return domain_wildcard_re.match(value) is not None
def val_domain(value):
"""Validate whether the parameter is a valid domin name."""
if not is_valid_domain(value):
raise ValidationError(_(u'%s - invalid domain name') % value)
def val_domain_wildcard(value):
"""Validate whether the parameter is a valid domin name."""
if not is_valid_domain_wildcard(value):
raise ValidationError(_(u'%s - invalid domain name') % value)
def is_valid_reverse_domain(value):
"""Check whether the parameter is a valid reverse domain name."""
return reverse_domain_re.match(value) is not None
def val_reverse_domain(value):
"""Validate whether the parameter is a valid reverse domain name."""
if not is_valid_reverse_domain(value):
raise ValidationError(u'%s - invalid reverse domain name' % value)
def is_valid_ipv6_template(value):
"""Check whether the parameter is a valid ipv6 template."""
return ipv6_template_re.match(value) is not None
def val_ipv6_template(value):
"""Validate whether the parameter is a valid ipv6 template."""
if not is_valid_ipv6_template(value):
raise ValidationError(u'%s - invalid reverse ipv6 template' % value)
def is_valid_ipv4_address(value):
"""Check whether the parameter is a valid IPv4 address."""
return ipv4_re.match(value) is not None
def val_ipv4(value):
"""Validate whether the parameter is a valid IPv4 address."""
if not is_valid_ipv4_address(value):
raise ValidationError(_(u'%s - not an IPv4 address') % value)
def val_ipv6(value):
"""Validate whether the parameter is a valid IPv6 address."""
if not is_valid_ipv6_address(value):
raise ValidationError(_(u'%s - not an IPv6 address') % value)
def val_mx(value):
"""Validate whether the parameter is a valid MX address definition.
Expected form is <priority>:<hostname>.
"""
mx = value.split(':', 1)
if not (len(mx) == 2 and mx[0].isdigit() and
domain_re.match(mx[1])):
raise ValidationError(_("Bad MX address format. "
"Should be: <priority>:<hostname>"))
def convert_ipv4_to_ipv6(ipv6_template, ipv4):
"""Convert IPv4 address string to IPv6 address string."""
m = ipv4.words
return IPAddress(ipv6_template % {'a': int(m[0]),
'b': int(m[1]),
'c': int(m[2]),
'd': int(m[3])})