app/django/contrib/formtools/utils.py
author Lennard de Rijk <ljvderijk@gmail.com>
Wed, 16 Sep 2009 13:38:18 +0200
changeset 2931 e89022c0657f
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Enabled the Student School type updater. The updater now passes along the runner URL to the starter function. Also fixed the TaskRunner to display correct error messages when a invalid option has been specified.

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()