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from functools import partial from django.contrib import messages from django.core.exceptions import ImproperlyConfigured from django.utils.decorators import method_decorator try: from django.utils.encoding import force_str as force_string except ImportError: from django.utils.encoding import force_text as force_string from django.utils.functional import Promise from django.views.decorators.csrf import csrf_exempt try: from django.urls import reverse except ImportError: from django.core.urlresolvers import reverse import six class CsrfExemptMixin(object): """ Exempts the view from CSRF requirements. NOTE: This should be the left-most mixin of a view. """ @method_decorator(csrf_exempt) def dispatch(self, *args, **kwargs): return super(CsrfExemptMixin, self).dispatch(*args, **kwargs) class UserFormKwargsMixin(object): """ CBV mixin which puts the user from the request into the form kwargs. Note: Using this mixin requires you to pop the `user` kwarg out of the dict in the super of your form's `__init__`. """ def get_form_kwargs(self): kwargs = super(UserFormKwargsMixin, self).get_form_kwargs() # Update the existing form kwargs dict with the request's user. kwargs.update({"user": self.request.user}) return kwargs class SuccessURLRedirectListMixin(object): """ Simple CBV mixin which sets the success url to the list view of a given app. Set success_list_url as a class attribute of your CBV and don't worry about overloading the get_success_url. This is only to be used for redirecting to a list page. If you need to reverse the url with kwargs, this is not the mixin to use. """ success_list_url = None # Default the success url to none def get_success_url(self): # Return the reversed success url. if self.success_list_url is None: raise ImproperlyConfigured( '{0} is missing a success_list_url ' 'name to reverse and redirect to. Define ' '{0}.success_list_url or override ' '{0}.get_success_url().'.format(self.__class__.__name__)) return reverse(self.success_list_url) class _MessageAPIWrapper(object): """ Wrap the django.contrib.messages.api module to automatically pass a given request object as the first parameter of function calls. """ API = set([ 'add_message', 'get_messages', 'get_level', 'set_level', 'debug', 'info', 'success', 'warning', 'error', ]) def __init__(self, request): for name in self.API: api_fn = getattr(messages.api, name) setattr(self, name, partial(api_fn, request)) class _MessageDescriptor(object): """ A descriptor that binds the _MessageAPIWrapper to the view's request. """ def __get__(self, instance, owner): return _MessageAPIWrapper(instance.request) class MessageMixin(object): """ Add a `messages` attribute on the view instance that wraps `django.contrib .messages`, automatically passing the current request object. """ messages = _MessageDescriptor() class FormValidMessageMixin(MessageMixin): """ Mixin allows you to set static message which is displayed by Django's messages framework through a static property on the class or programmatically by overloading the get_form_valid_message method. """ form_valid_message = None # Default to None def get_form_valid_message(self): """ Validate that form_valid_message is set and is either a unicode or str object. """ if self.form_valid_message is None: raise ImproperlyConfigured( '{0}.form_valid_message is not set. Define ' '{0}.form_valid_message, or override ' '{0}.get_form_valid_message().'.format(self.__class__.__name__) ) if not isinstance(self.form_valid_message, (six.string_types, six.text_type, Promise)): raise ImproperlyConfigured( '{0}.form_valid_message must be a str or unicode ' 'object.'.format(self.__class__.__name__) ) return force_string(self.form_valid_message) def form_valid(self, form): """ Call the super first, so that when overriding get_form_valid_message, we have access to the newly saved object. """ response = super(FormValidMessageMixin, self).form_valid(form) self.messages.success(self.get_form_valid_message(), fail_silently=True) return response def delete(self, *args, **kwargs): response = super(FormValidMessageMixin, self).delete(*args, **kwargs) self.messages.success(self.get_form_valid_message(), fail_silently=True) return response class FormInvalidMessageMixin(MessageMixin): """ Mixin allows you to set static message which is displayed by Django's messages framework through a static property on the class or programmatically by overloading the get_form_invalid_message method. """ form_invalid_message = None def get_form_invalid_message(self): """ Validate that form_invalid_message is set and is either a unicode or str object. """ if self.form_invalid_message is None: raise ImproperlyConfigured( '{0}.form_invalid_message is not set. Define ' '{0}.form_invalid_message, or override ' '{0}.get_form_invalid_message().'.format( self.__class__.__name__)) if not isinstance(self.form_invalid_message, (six.string_types, six.text_type, Promise)): raise ImproperlyConfigured( '{0}.form_invalid_message must be a str or unicode ' 'object.'.format(self.__class__.__name__)) return force_string(self.form_invalid_message) def form_invalid(self, form): response = super(FormInvalidMessageMixin, self).form_invalid(form) self.messages.error(self.get_form_invalid_message(), fail_silently=True) return response class FormMessagesMixin(FormValidMessageMixin, FormInvalidMessageMixin): """ Mixin is a shortcut to use both FormValidMessageMixin and FormInvalidMessageMixin. """ pass