Closes #16388: Move change logging resources from extras to core (#16545)

* Initial work on #16388

* Misc cleanup

netbox/core/api/serializers.py

@@ -1,3 +1,4 @@
+from .serializers_.change_logging import *
 from .serializers_.data import *
 from .serializers_.jobs import *
 from .nested_serializers import *

netbox/core/api/serializers_/change_logging.py

@@ -0,0 +1,65 @@
+from drf_spectacular.utils import extend_schema_field
+from rest_framework import serializers
+
+from core.choices import *
+from core.models import ObjectChange
+from netbox.api.exceptions import SerializerNotFound
+from netbox.api.fields import ChoiceField, ContentTypeField
+from netbox.api.serializers import BaseModelSerializer
+from users.api.serializers_.users import UserSerializer
+from utilities.api import get_serializer_for_model
+
+__all__ = (
+    'ObjectChangeSerializer',
+)
+
+
+class ObjectChangeSerializer(BaseModelSerializer):
+    url = serializers.HyperlinkedIdentityField(view_name='core-api:objectchange-detail')
+    user = UserSerializer(
+        nested=True,
+        read_only=True
+    )
+    action = ChoiceField(
+        choices=ObjectChangeActionChoices,
+        read_only=True
+    )
+    changed_object_type = ContentTypeField(
+        read_only=True
+    )
+    changed_object = serializers.SerializerMethodField(
+        read_only=True
+    )
+    prechange_data = serializers.JSONField(
+        source='prechange_data_clean',
+        read_only=True,
+        allow_null=True
+    )
+    postchange_data = serializers.JSONField(
+        source='postchange_data_clean',
+        read_only=True,
+        allow_null=True
+    )
+
+    class Meta:
+        model = ObjectChange
+        fields = [
+            'id', 'url', 'display', 'time', 'user', 'user_name', 'request_id', 'action', 'changed_object_type',
+            'changed_object_id', 'changed_object', 'prechange_data', 'postchange_data',
+        ]
+
+    @extend_schema_field(serializers.JSONField(allow_null=True))
+    def get_changed_object(self, obj):
+        """
+        Serialize a nested representation of the changed object.
+        """
+        if obj.changed_object is None:
+            return None
+
+        try:
+            serializer = get_serializer_for_model(obj.changed_object)
+        except SerializerNotFound:
+            return obj.object_repr
+        data = serializer(obj.changed_object, nested=True, context={'request': self.context['request']}).data
+
+        return data

netbox/core/api/urls.py

@@ -5,12 +5,10 @@ from . import views
 router = NetBoxRouter()
 router.APIRootView = views.CoreRootView
 
-# Data sources
 router.register('data-sources', views.DataSourceViewSet)
 router.register('data-files', views.DataFileViewSet)
-
-# Jobs
 router.register('jobs', views.JobViewSet)
+router.register('object-changes', views.ObjectChangeViewSet)
 
 app_name = 'core-api'
 urlpatterns = router.urls

netbox/core/api/views.py

@@ -8,6 +8,7 @@ from rest_framework.viewsets import ReadOnlyModelViewSet
 
 from core import filtersets
 from core.models import *
+from netbox.api.metadata import ContentTypeMetadata
 from netbox.api.viewsets import NetBoxModelViewSet, NetBoxReadOnlyModelViewSet
 from . import serializers
 
@@ -54,3 +55,13 @@ class JobViewSet(ReadOnlyModelViewSet):
     queryset = Job.objects.all()
     serializer_class = serializers.JobSerializer
     filterset_class = filtersets.JobFilterSet
+
+
+class ObjectChangeViewSet(ReadOnlyModelViewSet):
+    """
+    Retrieve a list of recent changes.
+    """
+    metadata_class = ContentTypeMetadata
+    queryset = ObjectChange.objects.valid_models()
+    serializer_class = serializers.ObjectChangeSerializer
+    filterset_class = filtersets.ObjectChangeFilterSet