app/django/contrib/formtools/utils.py
author Sverre Rabbelier <srabbelier@gmail.com>
Thu, 22 Jan 2009 16:04:48 +0000
changeset 901 d580a057103d
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Presence is now a 'abstract' View, pull in members from program This is signified by the removal of params['name'] and other values that are required by params.py, but also by the removal of the 'view' definition at the bottom of the file. Patch by: Sverre Rabbelier

try:
    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 = [(bf.name, bf.field.clean(bf.data) or '') for bf in form]
    data.extend(args)
    data.append(settings.SECRET_KEY)

    # Use HIGHEST_PROTOCOL because it's the most efficient. It requires
    # Python 2.3, but Django requires 2.3 anyway, so that's OK.
    pickled = pickle.dumps(data, pickle.HIGHEST_PROTOCOL)

    return md5_constructor(pickled).hexdigest()