Move core api to pkg/apis/core

pkg/apis/core/validation/events.go

@@ -0,0 +1,84 @@
+/*
+Copyright 2014 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 validation
+
+import (
+	"fmt"
+
+	"k8s.io/apimachinery/pkg/api/meta"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/util/validation"
+	"k8s.io/apimachinery/pkg/util/validation/field"
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/api/legacyscheme"
+)
+
+// ValidateEvent makes sure that the event makes sense.
+func ValidateEvent(event *api.Event) field.ErrorList {
+	allErrs := field.ErrorList{}
+
+	// Make sure event.Namespace and the involvedObject.Namespace agree
+	if len(event.InvolvedObject.Namespace) == 0 {
+		// event.Namespace must also be empty (or "default", for compatibility with old clients)
+		if event.Namespace != metav1.NamespaceNone && event.Namespace != metav1.NamespaceDefault {
+			allErrs = append(allErrs, field.Invalid(field.NewPath("involvedObject", "namespace"), event.InvolvedObject.Namespace, "does not match event.namespace"))
+		}
+	} else {
+		// event namespace must match
+		if event.Namespace != event.InvolvedObject.Namespace {
+			allErrs = append(allErrs, field.Invalid(field.NewPath("involvedObject", "namespace"), event.InvolvedObject.Namespace, "does not match event.namespace"))
+		}
+	}
+
+	// For kinds we recognize, make sure involvedObject.Namespace is set for namespaced kinds
+	if namespaced, err := isNamespacedKind(event.InvolvedObject.Kind, event.InvolvedObject.APIVersion); err == nil {
+		if namespaced && len(event.InvolvedObject.Namespace) == 0 {
+			allErrs = append(allErrs, field.Required(field.NewPath("involvedObject", "namespace"), fmt.Sprintf("required for kind %s", event.InvolvedObject.Kind)))
+		}
+		if !namespaced && len(event.InvolvedObject.Namespace) > 0 {
+			allErrs = append(allErrs, field.Invalid(field.NewPath("involvedObject", "namespace"), event.InvolvedObject.Namespace, fmt.Sprintf("not allowed for kind %s", event.InvolvedObject.Kind)))
+		}
+	}
+
+	for _, msg := range validation.IsDNS1123Subdomain(event.Namespace) {
+		allErrs = append(allErrs, field.Invalid(field.NewPath("namespace"), event.Namespace, msg))
+	}
+	return allErrs
+}
+
+// Check whether the kind in groupVersion is scoped at the root of the api hierarchy
+func isNamespacedKind(kind, groupVersion string) (bool, error) {
+	gv, err := schema.ParseGroupVersion(groupVersion)
+	if err != nil {
+		return false, err
+	}
+	g, err := legacyscheme.Registry.Group(gv.Group)
+	if err != nil {
+		return false, err
+	}
+
+	restMapping, err := g.RESTMapper.RESTMapping(schema.GroupKind{Group: gv.Group, Kind: kind}, gv.Version)
+	if err != nil {
+		return false, err
+	}
+	scopeName := restMapping.Scope.Name()
+	if scopeName == meta.RESTScopeNameNamespace {
+		return true, nil
+	}
+	return false, nil
+}