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45 lines
1.7 KiB
Python
45 lines
1.7 KiB
Python
from django.db.models import Q, QuerySet
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from utilities.permissions import permission_is_exempt
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class RestrictedQuerySet(QuerySet):
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def restrict(self, user, action='view'):
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"""
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Filter the QuerySet to return only objects on which the specified user has been granted the specified
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permission.
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:param user: User instance
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:param action: The action which must be permitted (e.g. "view" for "dcim.view_site"); default is 'view'
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"""
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# Resolve the full name of the required permission
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app_label = self.model._meta.app_label
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model_name = self.model._meta.model_name
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permission_required = f'{app_label}.{action}_{model_name}'
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# Bypass restriction for superusers and exempt views
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if user.is_superuser or permission_is_exempt(permission_required):
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qs = self
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# User is anonymous or has not been granted the requisite permission
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elif not user.is_authenticated or permission_required not in user.get_all_permissions():
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qs = self.none()
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# Filter the queryset to include only objects with allowed attributes
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else:
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attrs = Q()
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for perm_attrs in user._object_perm_cache[permission_required]:
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if type(perm_attrs) is list:
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for p in perm_attrs:
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attrs |= Q(**p)
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elif perm_attrs:
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attrs |= Q(**perm_attrs)
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else:
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# Any permission with null constraints grants access to _all_ instances
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attrs = Q()
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break
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qs = self.filter(attrs)
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return qs
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