64 lines
2.1 KiB
Python
64 lines
2.1 KiB
Python
try:
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import cPickle as pickle
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except ImportError:
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import pickle
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from django.conf import settings
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from django.forms import BooleanField
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from django.utils.crypto import salted_hmac
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from django.utils.hashcompat import md5_constructor
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def security_hash(request, form, *args):
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"""
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Calculates a security hash for the given Form instance.
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This creates a list of the form field names/values in a deterministic
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order, pickles the result with the SECRET_KEY setting, then takes an md5
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hash of that.
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"""
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import warnings
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warnings.warn("security_hash is deprecated; use form_hmac instead",
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PendingDeprecationWarning)
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data = []
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for bf in form:
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# Get the value from the form data. If the form allows empty or hasn't
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# changed then don't call clean() to avoid trigger validation errors.
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if form.empty_permitted and not form.has_changed():
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value = bf.data or ''
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else:
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value = bf.field.clean(bf.data) or ''
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if isinstance(value, basestring):
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value = value.strip()
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data.append((bf.name, value))
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data.extend(args)
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data.append(settings.SECRET_KEY)
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# Use HIGHEST_PROTOCOL because it's the most efficient. It requires
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# Python 2.3, but Django requires 2.4 anyway, so that's OK.
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pickled = pickle.dumps(data, pickle.HIGHEST_PROTOCOL)
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return md5_constructor(pickled).hexdigest()
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def form_hmac(form):
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"""
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Calculates a security hash for the given Form instance.
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"""
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data = []
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for bf in form:
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# Get the value from the form data. If the form allows empty or hasn't
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# changed then don't call clean() to avoid trigger validation errors.
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if form.empty_permitted and not form.has_changed():
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value = bf.data or ''
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else:
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value = bf.field.clean(bf.data) or ''
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if isinstance(value, basestring):
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value = value.strip()
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data.append((bf.name, value))
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pickled = pickle.dumps(data, pickle.HIGHEST_PROTOCOL)
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key_salt = 'django.contrib.formtools'
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return salted_hmac(key_salt, pickled).hexdigest()
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