mirror of
https://github.com/k3s-io/kubernetes.git
synced 2025-10-31 05:40:42 +00:00
110 lines
3.5 KiB
Go
110 lines
3.5 KiB
Go
/*
|
|
Copyright 2015 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 fieldpath
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
|
|
"k8s.io/apimachinery/pkg/api/meta"
|
|
"k8s.io/apimachinery/pkg/util/sets"
|
|
"k8s.io/apimachinery/pkg/util/validation"
|
|
)
|
|
|
|
// FormatMap formats map[string]string to a string.
|
|
func FormatMap(m map[string]string) (fmtStr string) {
|
|
// output with keys in sorted order to provide stable output
|
|
keys := sets.NewString()
|
|
for key := range m {
|
|
keys.Insert(key)
|
|
}
|
|
for _, key := range keys.List() {
|
|
fmtStr += fmt.Sprintf("%v=%q\n", key, m[key])
|
|
}
|
|
fmtStr = strings.TrimSuffix(fmtStr, "\n")
|
|
|
|
return
|
|
}
|
|
|
|
// ExtractFieldPathAsString extracts the field from the given object
|
|
// and returns it as a string. The object must be a pointer to an
|
|
// API type.
|
|
func ExtractFieldPathAsString(obj interface{}, fieldPath string) (string, error) {
|
|
accessor, err := meta.Accessor(obj)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
if path, subscript, ok := SplitMaybeSubscriptedPath(fieldPath); ok {
|
|
switch path {
|
|
case "metadata.annotations":
|
|
if errs := validation.IsQualifiedName(strings.ToLower(subscript)); len(errs) != 0 {
|
|
return "", fmt.Errorf("invalid key subscript in %s: %s", fieldPath, strings.Join(errs, ";"))
|
|
}
|
|
return accessor.GetAnnotations()[subscript], nil
|
|
case "metadata.labels":
|
|
if errs := validation.IsQualifiedName(subscript); len(errs) != 0 {
|
|
return "", fmt.Errorf("invalid key subscript in %s: %s", fieldPath, strings.Join(errs, ";"))
|
|
}
|
|
return accessor.GetLabels()[subscript], nil
|
|
default:
|
|
return "", fmt.Errorf("fieldPath %q does not support subscript", fieldPath)
|
|
}
|
|
}
|
|
|
|
switch fieldPath {
|
|
case "metadata.annotations":
|
|
return FormatMap(accessor.GetAnnotations()), nil
|
|
case "metadata.labels":
|
|
return FormatMap(accessor.GetLabels()), nil
|
|
case "metadata.name":
|
|
return accessor.GetName(), nil
|
|
case "metadata.namespace":
|
|
return accessor.GetNamespace(), nil
|
|
case "metadata.uid":
|
|
return string(accessor.GetUID()), nil
|
|
}
|
|
|
|
return "", fmt.Errorf("unsupported fieldPath: %v", fieldPath)
|
|
}
|
|
|
|
// SplitMaybeSubscriptedPath checks whether the specified fieldPath is
|
|
// subscripted, and
|
|
// - if yes, this function splits the fieldPath into path and subscript, and
|
|
// returns (path, subscript, true).
|
|
// - if no, this function returns (fieldPath, "", false).
|
|
//
|
|
// Example inputs and outputs:
|
|
// - "metadata.annotations['myKey']" --> ("metadata.annotations", "myKey", true)
|
|
// - "metadata.annotations['a[b]c']" --> ("metadata.annotations", "a[b]c", true)
|
|
// - "metadata.labels['']" --> ("metadata.labels", "", true)
|
|
// - "metadata.labels" --> ("metadata.labels", "", false)
|
|
func SplitMaybeSubscriptedPath(fieldPath string) (string, string, bool) {
|
|
if !strings.HasSuffix(fieldPath, "']") {
|
|
return fieldPath, "", false
|
|
}
|
|
s := strings.TrimSuffix(fieldPath, "']")
|
|
parts := strings.SplitN(s, "['", 2)
|
|
if len(parts) < 2 {
|
|
return fieldPath, "", false
|
|
}
|
|
if len(parts[0]) == 0 {
|
|
return fieldPath, "", false
|
|
}
|
|
return parts[0], parts[1], true
|
|
}
|