/*
Copyright 2018 The Knative Authors

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package duck

import (
	"encoding/json"
)

// Marshallable is implementated by the Unstructured K8s types.
type Marshalable interface {
	MarshalJSON() ([]byte, error)
}

// FromUnstructured takes unstructured object from (say from client-go/dynamic) and
// converts it into our duck types.
func FromUnstructured(obj Marshalable, target interface{}) error {
	// Use the unstructured marshaller to ensure it's proper JSON
	raw, err := obj.MarshalJSON()
	if err != nil {
		return err
	}
	return json.Unmarshal(raw, &target)
}