feat: Serving CRD in ks apiserver

Signed-off-by: Roland.Ma <rolandma@kubesphere.io>

pkg/models/crds/unstructured_handler.go

@@ -0,0 +1,111 @@
+/*
+Copyright 2022 The KubeSphere 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 crds
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/emicklei/go-restful"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/types"
+
+	"kubesphere.io/kubesphere/pkg/api"
+	"kubesphere.io/kubesphere/pkg/apiserver/query"
+
+	"sigs.k8s.io/controller-runtime/pkg/client"
+)
+
+type UnstructuredCRDHandler struct {
+	c       client.Reader
+	gvk     schema.GroupVersionKind
+	gvkList schema.GroupVersionKind
+}
+
+func NewUnstructured(cache client.Reader, gvk schema.GroupVersionKind) Client {
+	return &UnstructuredCRDHandler{c: cache, gvk: gvk, gvkList: schema.GroupVersionKind{Version: gvk.Version, Group: gvk.Group, Kind: gvk.Kind + "List"}}
+}
+
+func (h *UnstructuredCRDHandler) GetResources(request *restful.Request, response *restful.Response) {
+	namespace := request.PathParameter("namespace")
+	name := request.PathParameter("name")
+
+	obj, err := h.Get(types.NamespacedName{
+		Namespace: namespace,
+		Name:      name,
+	})
+
+	if err != nil {
+		api.HandleError(response, nil, err)
+		return
+	}
+	response.WriteEntity(obj)
+}
+
+// handleListResources retrieves resources
+func (h *UnstructuredCRDHandler) ListResources(request *restful.Request, response *restful.Response) {
+	q := query.ParseQueryParameter(request)
+	namespace := request.PathParameter("namespace")
+	workspace := request.PathParameter("workspace")
+	if workspace != "" {
+		// filter by workspace
+		q.Filters[query.FieldLabel] = query.Value(fmt.Sprintf("%s=%s", "kubesphere.io/workspace", workspace))
+	}
+	list, err := h.List(namespace, q)
+	if err != nil {
+		api.HandleError(response, nil, err)
+		return
+	}
+	response.WriteEntity(list)
+}
+
+func (h *UnstructuredCRDHandler) Get(key types.NamespacedName) (client.Object, error) {
+
+	obj := &unstructured.Unstructured{}
+	obj.SetGroupVersionKind(h.gvk)
+
+	if err := h.c.Get(context.TODO(), key, obj); err != nil {
+		return nil, err
+	}
+	return obj, nil
+}
+
+func (h *UnstructuredCRDHandler) List(namespace string, q *query.Query) (*api.ListResult, error) {
+
+	listObj := &unstructured.UnstructuredList{}
+	listObj.SetGroupVersionKind(h.gvkList)
+
+	if err := h.c.List(context.TODO(), listObj, &client.ListOptions{LabelSelector: q.Selector()}, client.InNamespace(namespace)); err != nil {
+		return nil, err
+	}
+
+	result := DefaultList(listObj, q, h.compare, h.filter)
+
+	return result, nil
+}
+
+func (d *UnstructuredCRDHandler) compare(left, right metav1.Object, field query.Field) bool {
+
+	return DefaultObjectMetaCompare(left, right, field)
+}
+
+func (d *UnstructuredCRDHandler) filter(object metav1.Object, filter query.Filter) bool {
+	//TODO Maybe we can use a json path Filter here
+	return DefaultObjectMetaFilter(object, filter)
+}