89 lines
2.9 KiB
Python
89 lines
2.9 KiB
Python
"""policy API Views"""
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from django.core.exceptions import ObjectDoesNotExist
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from rest_framework.serializers import (
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ModelSerializer,
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PrimaryKeyRelatedField,
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SerializerMethodField,
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)
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from rest_framework.viewsets import ModelViewSet, ReadOnlyModelViewSet
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from passbook.policies.forms import GENERAL_FIELDS
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from passbook.policies.models import Policy, PolicyBinding, PolicyBindingModel
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class PolicyBindingModelForeignKey(PrimaryKeyRelatedField):
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"""rest_framework PrimaryKeyRelatedField which resolves
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model_manager's InheritanceQuerySet"""
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def use_pk_only_optimization(self):
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return False
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def to_internal_value(self, data):
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if self.pk_field is not None:
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data = self.pk_field.to_internal_value(data)
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try:
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# Due to inheritance, a direct DB lookup for the primary key
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# won't return anything. This is because the direct lookup
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# checks the PK of PolicyBindingModel (for example),
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# but we get given the Primary Key of the inheriting class
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for model in self.get_queryset().select_subclasses().all().select_related():
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if model.pk == data:
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return model
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# as a fallback we still try a direct lookup
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return self.get_queryset().get_subclass(pk=data)
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except ObjectDoesNotExist:
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self.fail("does_not_exist", pk_value=data)
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except (TypeError, ValueError):
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self.fail("incorrect_type", data_type=type(data).__name__)
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def to_representation(self, value):
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correct_model = PolicyBindingModel.objects.get_subclass(pbm_uuid=value.pbm_uuid)
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return correct_model.pk
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class PolicyBindingSerializer(ModelSerializer):
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"""PolicyBinding Serializer"""
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# Because we're not interested in the PolicyBindingModel's PK but rather the subclasses PK,
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# we have to manually declare this field
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target = PolicyBindingModelForeignKey(
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queryset=PolicyBindingModel.objects.select_subclasses(), required=True,
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)
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class Meta:
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model = PolicyBinding
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fields = ["pk", "policy", "target", "enabled", "order", "timeout"]
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class PolicyBindingViewSet(ModelViewSet):
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"""PolicyBinding Viewset"""
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queryset = PolicyBinding.objects.all()
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serializer_class = PolicyBindingSerializer
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class PolicySerializer(ModelSerializer):
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"""Policy Serializer"""
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__type__ = SerializerMethodField(method_name="get_type")
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def get_type(self, obj):
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"""Get object type so that we know which API Endpoint to use to get the full object"""
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return obj._meta.object_name.lower().replace("policy", "")
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class Meta:
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model = Policy
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fields = ["pk"] + GENERAL_FIELDS + ["__type__"]
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class PolicyViewSet(ReadOnlyModelViewSet):
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"""Policy Viewset"""
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queryset = Policy.objects.all()
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serializer_class = PolicySerializer
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def get_queryset(self):
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return Policy.objects.select_subclasses()
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