kyverno/pkg/cel/utils/convert.go

package utils

import (
	"reflect"

	"github.com/google/cel-go/common/types/ref"
	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
	"k8s.io/apimachinery/pkg/runtime"
)

func ConvertToNative[T any](value ref.Val) (T, error) {
	// try to convert value to native type
	response, err := value.ConvertToNative(reflect.TypeFor[T]())
	// if it failed return default value for T and error
	if err != nil {
		var t T
		return t, err
	}
	// return the converted value
	return response.(T), nil
}

func ConvertObjectToUnstructured(obj any) (*unstructured.Unstructured, error) {
	if obj == nil || reflect.ValueOf(obj).IsNil() {
		return &unstructured.Unstructured{Object: nil}, nil
	}
	ret, err := runtime.DefaultUnstructuredConverter.ToUnstructured(obj)
	if err != nil {
		return nil, err
	}
	return &unstructured.Unstructured{Object: ret}, nil
}

func ConvertBytesToUnstructuredList(b []byte) (*unstructured.UnstructuredList, error) {
	list := &unstructured.UnstructuredList{}
	err := list.UnmarshalJSON(b)
	if err != nil {
		return nil, err
	}
	return list, nil
}