101 lines
3.5 KiB
Python
101 lines
3.5 KiB
Python
from django.core.exceptions import FieldDoesNotExist, ImproperlyConfigured
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from django.core.paginator import Paginator
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from django.db.models import QuerySet
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class RestrictedViewMixin:
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"""
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This mixin overrides two helpers in order to pass the user object to the filters.
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get_queryset alters the objects returned for list views.
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get_form_kwargs passes the request object to the form class. Remaining permissions
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checks are in forms.py
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"""
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allow_empty = True
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queryset = None
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model = None
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paginate_by = None
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paginate_orphans = 0
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context_object_name = None
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paginator_class = Paginator
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page_kwarg = "page"
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ordering = None
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def set_extra_args(self, user):
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"""
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This function is overriden to filter the objects by the requesting user.
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"""
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self.extra_permission_args = {}
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def get_queryset(self, **kwargs):
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"""
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This function is overriden to filter the objects by the requesting user.
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"""
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self.set_extra_args(self.request.user)
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if self.queryset is not None:
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queryset = self.queryset
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if isinstance(queryset, QuerySet):
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# queryset = queryset.all()
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queryset = queryset.filter(
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user=self.request.user, **self.extra_permission_args
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)
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elif self.model is not None:
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queryset = self.model._default_manager.filter(
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user=self.request.user, **self.extra_permission_args
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)
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else:
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raise ImproperlyConfigured(
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"%(cls)s is missing a QuerySet. Define "
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"%(cls)s.model, %(cls)s.queryset, or override "
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"%(cls)s.get_queryset()." % {"cls": self.__class__.__name__}
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)
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if hasattr(self, "get_ordering"):
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ordering = self.get_ordering()
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if ordering:
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if isinstance(ordering, str):
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ordering = (ordering,)
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queryset = queryset.order_by(*ordering)
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return queryset
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def get_form_kwargs(self):
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"""Passes the request object to the form class.
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This is necessary to only display members that belong to a given user"""
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kwargs = super().get_form_kwargs()
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kwargs["request"] = self.request
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return kwargs
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class RestrictedFormMixin:
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"""
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This mixin is used to restrict the queryset of a form to the current user.
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The request object is passed from the view.
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Fieldargs is used to pass additional arguments to the queryset filter.
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"""
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fieldargs = {}
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# TODO: implement set_extra_args to check more permissions here
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# for completeness, however as views open forms, the permissions
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# are already checked there, so it may not be necessary.
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def __init__(self, *args, **kwargs):
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# self.fieldargs = {}
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self.request = kwargs.pop("request")
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super().__init__(*args, **kwargs)
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for field in self.fields:
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# Check it's not something like a CharField which has no queryset
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if not hasattr(self.fields[field], "queryset"):
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continue
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model = self.fields[field].queryset.model
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# Check if the model has a user field
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try:
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model._meta.get_field("user")
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# Add the user to the queryset filters
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self.fields[field].queryset = model.objects.filter(
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user=self.request.user, **self.fieldargs.get(field, {})
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)
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except FieldDoesNotExist:
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pass
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