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# -*- coding: utf-8 -*-
"""
Encrypted fields from Django Extensions, modified for use with mongoDB
"""
from django import forms
from django.conf import settings
from django.core.exceptions import ImproperlyConfigured
from mongoengine.base import BaseField
try:
from keyczar import keyczar
except ImportError:
raise ImportError('Using an encrypted field requires the Keyczar module. You can obtain Keyczar from http://www.keyczar.org/.')
class BaseEncryptedField(BaseField):
prefix = 'enc_str:::'
def __init__(self, *args, **kwargs):
if not hasattr(settings, 'ENCRYPTED_FIELD_KEYS_DIR'):
raise ImproperlyConfigured('You must set settings.ENCRYPTED_FIELD_KEYS_DIR to your Keyczar keys directory.')
self.crypt = keyczar.Crypter.Read(settings.ENCRYPTED_FIELD_KEYS_DIR)
super(BaseEncryptedField, self).__init__(*args, **kwargs)
def to_python(self, value):
if value.startswith(self.prefix):
retval = self.crypt.Decrypt(value[len(self.prefix):])
else:
retval = value
return retval
def get_db_prep_value(self, value):
if not value.startswith(self.prefix):
value = self.prefix + self.crypt.Encrypt(value)
return value
class EncryptedTextField(BaseEncryptedField):
def get_internal_type(self):
return 'StringField'
def formfield(self, **kwargs):
defaults = {'widget': forms.Textarea}
defaults.update(kwargs)
return super(EncryptedTextField, self).formfield(**defaults)
class EncryptedCharField(BaseEncryptedField):
def __init__(self, max_length=None, *args, **kwargs):
if max_length:
max_length += len(self.prefix)
super(EncryptedCharField, self).__init__(max_length=max_length, *args, **kwargs)
def get_internal_type(self):
return "StringField"
def formfield(self, **kwargs):
defaults = {'max_length': self.max_length}
defaults.update(kwargs)
return super(EncryptedCharField, self).formfield(**defaults)
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