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import cPickle as pickle
except ImportError:
import pickle
from django.conf import settings
from django.utils.hashcompat import md5_constructor
from django.forms import BooleanField
def security_hash(request, form, *args):
Calculates a security hash for the given Form instance.
This creates a list of the form field names/values in a deterministic
order, pickles the result with the SECRET_KEY setting, then takes an md5
hash of that.
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 = or ''
value = bf.field.clean( or ''
if isinstance(value, basestring):
value = value.strip()
data.append((, value))
# Use HIGHEST_PROTOCOL because it's the most efficient. It requires
# Python 2.3, but Django requires 2.4 anyway, so that's OK.
pickled = pickle.dumps(data, pickle.HIGHEST_PROTOCOL)
return md5_constructor(pickled).hexdigest()
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