- Author:
- johnnoone
- Posted:
- February 22, 2009
- Language:
- Python
- Version:
- 1.0
- Score:
- 2 (after 2 ratings)
For disabling autocomplete and security purpose, this snippet defines a CharField with a randomness name for each request of the form.
This is useful for turning off autocomplete for credit card input in all browsers, without breaking the xhtml validation.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 | from random import choice
from django.forms import MultiWidget, TextInput, HiddenInput, MultiValueField, CharField
from django.utils.safestring import mark_safe
class NonceInput(MultiWidget):
def __init__(self, attrs=None):
allowed_chars = "abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ23456789"
self.nonce = ''.join([choice(allowed_chars) for i in range(20)])
try:
del attrs['autocomplete']
except:
pass
widgets = (TextInput(attrs=attrs), HiddenInput(attrs=attrs))
super(NonceInput, self).__init__(widgets, attrs)
def value_from_datadict(self, data, files, name):
# hidden field
nonce_name = self.widgets[1].value_from_datadict(data, files, name + '_1')
value_field = self.widgets[0].value_from_datadict(data, files, nonce_name)
return [value_field, nonce_name]
def render(self, name, value, attrs=None):
# value is a list of values, each corresponding to a widget
# in self.widgets.
output = []
final_attrs = self.build_attrs(attrs)
id_ = final_attrs.get('id', None)
nonce_name = name + '_%s' % self.nonce
if id_:
final_attrs = dict(final_attrs, id='%s_0' % id_)
output.append(self.widgets[0].render(nonce_name, value, final_attrs))
if id_:
final_attrs = dict(final_attrs, id='%s_1' % id_)
output.append(self.widgets[1].render(name + '_1', nonce_name, final_attrs))
return mark_safe(self.format_output(output))
def decompress(self, value):
return [value, self.nonce]
class NonceField(MultiValueField):
"""Defines a CharField with a randomness name for disabling autocomplete and
security purpose.
https://wiki.mozilla.org/The_autocomplete_attribute_and_web_documents_using_XHTML#Security
http://en.wikipedia.org/wiki/Cryptographic_nonce
"""
widget = NonceInput
def __init__(self, *args, **kwargs):
fields = (
CharField(),
CharField()
)
super(NonceField, self).__init__(fields, *args, **kwargs)
def compress(self, data_list):
try:
return data_list[0]
except:
None
|
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