Basic utility functions for authentication.
This contains some validation functions that may be useful for forms.
Validate that the test cookie was properly set in a prior request.
If the test cookie was not set, the given form’s
submitfield will be set with an error saying that cookies must be enabled.
validate_old_password(form, user, field_name=u'password')¶
Validate that the password given on a form was valid.
This is intended for Password Change forms, and will check that the specified password in the form matches the user’s current password.