added configmap resource implementation

This also changes the resource to be a concrete type instead of
interface.

pkg/kinflate/resource/configmap.go

@@ -0,0 +1,67 @@
+/*
+Copyright 2018 The Kubernetes 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 resource
+
+import (
+	corev1 "k8s.io/api/core/v1"
+	manifest "k8s.io/kubectl/pkg/apis/manifest/v1alpha1"
+	cutil "k8s.io/kubectl/pkg/kinflate/configmapandsecret/util"
+)
+
+// (Note): pass in loader which has rootPath context and knows how to load
+// files given a relative path.
+// NewFromConfigMap returns a Resource given a configmap metadata from manifest
+// file.
+func NewFromConfigMap(cm manifest.ConfigMap) (*Resource, error) {
+	corev1CM, err := makeConfigMap(cm)
+	if err != nil {
+		return nil, err
+	}
+
+	data, err := objectToUnstructured(corev1CM)
+	if err != nil {
+		return nil, err
+	}
+	return &Resource{Data: data}, nil
+}
+
+func makeConfigMap(cm manifest.ConfigMap) (*corev1.ConfigMap, error) {
+	corev1cm := &corev1.ConfigMap{}
+	corev1cm.APIVersion = "v1"
+	corev1cm.Kind = "ConfigMap"
+	corev1cm.Name = cm.Name
+	corev1cm.Data = map[string]string{}
+
+	// TODO: move the configmap helpers functions in this file/package
+	if cm.EnvSource != "" {
+		if err := cutil.HandleConfigMapFromEnvFileSource(corev1cm, cm.EnvSource); err != nil {
+			return nil, err
+		}
+	}
+	if cm.FileSources != nil {
+		if err := cutil.HandleConfigMapFromFileSources(corev1cm, cm.FileSources); err != nil {
+			return nil, err
+		}
+	}
+	if cm.LiteralSources != nil {
+		if err := cutil.HandleConfigMapFromLiteralSources(corev1cm, cm.LiteralSources); err != nil {
+			return nil, err
+		}
+	}
+
+	return corev1cm, nil
+}

pkg/kinflate/resource/resource.go

@@ -16,10 +16,41 @@ limitations under the License.
 
 package resource
 
-import "k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+import (
+	"encoding/json"
 
-// Examples: deployment, service, configmap, secret, etc.
-type Resource interface {
-	Name() string
-	Data() unstructured.Unstructured
+	"k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/kubectl/pkg/kinflate/types"
+)
+
+// Resource represents a Kubernetes Resource Object for ex. Deployment, Server
+// ConfigMap etc.
+type Resource struct {
+	Data *unstructured.Unstructured
+}
+
+// GVKN returns Group/Version/Kind/Name for the resource.
+func (r *Resource) GVKN() types.GroupVersionKindName {
+	var emptyZVKN types.GroupVersionKindName
+	if r.Data == nil {
+		return emptyZVKN
+	}
+	accessor, err := meta.Accessor(r.Data)
+	if err != nil {
+		return emptyZVKN
+	}
+	gvk := r.Data.GetObjectKind().GroupVersionKind()
+	return types.GroupVersionKindName{GVK: gvk, Name: accessor.GetName()}
+}
+
+func objectToUnstructured(in runtime.Object) (*unstructured.Unstructured, error) {
+	marshaled, err := json.Marshal(in)
+	if err != nil {
+		return nil, err
+	}
+	var out unstructured.Unstructured
+	err = out.UnmarshalJSON(marshaled)
+	return &out, err
 }