build: move e2e dependencies into e2e/go.mod

Several packages are only used while running the e2e suite. These
packages are less important to update, as the they can not influence the
final executable that is part of the Ceph-CSI container-image.

By moving these dependencies out of the main Ceph-CSI go.mod, it is
easier to identify if a reported CVE affects Ceph-CSI, or only the
testing (like most of the Kubernetes CVEs).

Signed-off-by: Niels de Vos <ndevos@ibm.com>

e2e/vendor/github.com/google/gnostic-models/compiler/extensions.go

@@ -0,0 +1,86 @@
+// Copyright 2017 Google LLC. All Rights Reserved.
+//
+// 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 compiler
+
+import (
+	"bytes"
+	"fmt"
+	"os/exec"
+	"strings"
+
+	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/types/known/anypb"
+	yaml "gopkg.in/yaml.v3"
+
+	extensions "github.com/google/gnostic-models/extensions"
+)
+
+// ExtensionHandler describes a binary that is called by the compiler to handle specification extensions.
+type ExtensionHandler struct {
+	Name string
+}
+
+// CallExtension calls a binary extension handler.
+func CallExtension(context *Context, in *yaml.Node, extensionName string) (handled bool, response *anypb.Any, err error) {
+	if context == nil || context.ExtensionHandlers == nil {
+		return false, nil, nil
+	}
+	handled = false
+	for _, handler := range *(context.ExtensionHandlers) {
+		response, err = handler.handle(in, extensionName)
+		if response == nil {
+			continue
+		} else {
+			handled = true
+			break
+		}
+	}
+	return handled, response, err
+}
+
+func (extensionHandlers *ExtensionHandler) handle(in *yaml.Node, extensionName string) (*anypb.Any, error) {
+	if extensionHandlers.Name != "" {
+		yamlData, _ := yaml.Marshal(in)
+		request := &extensions.ExtensionHandlerRequest{
+			CompilerVersion: &extensions.Version{
+				Major: 0,
+				Minor: 1,
+				Patch: 0,
+			},
+			Wrapper: &extensions.Wrapper{
+				Version:       "unknown", // TODO: set this to the type/version of spec being parsed.
+				Yaml:          string(yamlData),
+				ExtensionName: extensionName,
+			},
+		}
+		requestBytes, _ := proto.Marshal(request)
+		cmd := exec.Command(extensionHandlers.Name)
+		cmd.Stdin = bytes.NewReader(requestBytes)
+		output, err := cmd.Output()
+		if err != nil {
+			return nil, err
+		}
+		response := &extensions.ExtensionHandlerResponse{}
+		err = proto.Unmarshal(output, response)
+		if err != nil || !response.Handled {
+			return nil, err
+		}
+		if len(response.Errors) != 0 {
+			return nil, fmt.Errorf("Errors when parsing: %+v for field %s by vendor extension handler %s. Details %+v", in, extensionName, extensionHandlers.Name, strings.Join(response.Errors, ","))
+		}
+		return response.Value, nil
+	}
+	return nil, nil
+}