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
|
from __future__ import unicode_literals
# Do not try cPickle here (see #18340)
import pickle
from django.utils import six
from django.utils.crypto import salted_hmac
def form_hmac(form):
"""
Calculates a security hash for the given Form instance.
"""
data = []
for bf in form:
# Get the value from the form data. If the form allows empty or hasn't
# changed then don't call clean() to avoid trigger validation errors.
if form.empty_permitted and not form.has_changed():
value = bf.data or ''
else:
value = bf.field.clean(bf.data) or ''
if isinstance(value, six.string_types):
value = value.strip()
data.append((bf.name, value))
pickled = pickle.dumps(data, pickle.HIGHEST_PROTOCOL)
key_salt = 'django.contrib.formtools'
return salted_hmac(key_salt, pickled).hexdigest()
|
