mirror of https://github.com/knative/client.git
86 lines
2.7 KiB
Go
86 lines
2.7 KiB
Go
/*
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Copyright 2021 The Knative Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package feature
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import (
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"context"
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"fmt"
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"reflect"
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"strings"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"knative.dev/pkg/apis"
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)
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// ValidateAPIFields checks that the experimental features fields are disabled if the experimental flag is disabled.
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// experimentalFields can contain a string with dots, to identify sub-structs, like "Destination.Ref.APIVersion"
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func ValidateAPIFields(ctx context.Context, featureName string, object interface{}, experimentalFields ...string) (errs *apis.FieldError) {
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obj := reflect.ValueOf(object)
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obj = reflect.Indirect(obj)
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if obj.Kind() != reflect.Struct {
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return nil
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}
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// If feature not enabled, let's check the field is not used
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if !FromContext(ctx).IsEnabled(featureName) {
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for _, fieldName := range experimentalFields {
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fieldVal := walk(obj, strings.Split(fieldName, ".")...)
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if !fieldVal.IsZero() {
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errs = errs.Also(&apis.FieldError{
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Message: fmt.Sprintf("Disallowed field because the experimental feature '%s' is disabled", featureName),
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Paths: []string{fmt.Sprintf("%s.%s", obj.Type().Name(), fieldName)},
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})
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}
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}
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}
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return errs
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}
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// ValidateAnnotations checks that the experimental features annotations are disabled if the experimental flag is disabled
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func ValidateAnnotations(ctx context.Context, featureName string, object metav1.Object, experimentalAnnotations ...string) (errs *apis.FieldError) {
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// If feature not enabled, let's check the annotation is not used
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if !FromContext(ctx).IsEnabled(featureName) {
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for _, annotation := range experimentalAnnotations {
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if _, ok := object.GetAnnotations()[annotation]; ok {
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errs = errs.Also(&apis.FieldError{
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Message: fmt.Sprintf("Disallowed annotation because the experimental feature '%s' is disabled", featureName),
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Paths: []string{annotation},
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})
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}
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}
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}
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return errs
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}
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func walk(value reflect.Value, paths ...string) reflect.Value {
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switch value.Kind() {
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case reflect.Struct:
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newVal := value.FieldByName(paths[0])
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if len(paths) == 1 {
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return newVal
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}
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return walk(value.FieldByName(paths[0]), paths[1:]...)
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case reflect.Ptr:
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return walk(reflect.Indirect(value), paths...)
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default:
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return reflect.Zero(value.Type())
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}
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}
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