27 lines
850 B
Python
27 lines
850 B
Python
# Do not try cPickle here (see #18340)
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import pickle
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from django.utils.crypto import salted_hmac
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from django.utils import six
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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, six.string_types):
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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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