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// Copyright 2022 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0
package refvar
import (
"fmt"
"strconv"
"sigs.k8s.io/kustomize/api/filters/fieldspec"
"sigs.k8s.io/kustomize/api/types"
"sigs.k8s.io/kustomize/kyaml/kio"
"sigs.k8s.io/kustomize/kyaml/yaml"
)
// Filter updates $(VAR) style variables with values.
// The fieldSpecs are the places to look for occurrences of $(VAR).
type Filter struct {
MappingFunc MappingFunc `json:"mappingFunc,omitempty" yaml:"mappingFunc,omitempty"`
FieldSpec types.FieldSpec `json:"fieldSpec,omitempty" yaml:"fieldSpec,omitempty"`
}
func (f Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
return kio.FilterAll(yaml.FilterFunc(f.run)).Filter(nodes)
}
func (f Filter) run(node *yaml.RNode) (*yaml.RNode, error) {
err := node.PipeE(fieldspec.Filter{
FieldSpec: f.FieldSpec,
SetValue: f.set,
})
return node, err
}
func (f Filter) set(node *yaml.RNode) error {
if yaml.IsMissingOrNull(node) {
return nil
}
switch node.YNode().Kind {
case yaml.ScalarNode:
return f.setScalar(node)
case yaml.MappingNode:
return f.setMap(node)
case yaml.SequenceNode:
return f.setSeq(node)
default:
return fmt.Errorf("invalid type encountered %v", node.YNode().Kind)
}
}
func updateNodeValue(node *yaml.Node, newValue interface{}) {
switch newValue := newValue.(type) {
case int:
node.Value = strconv.FormatInt(int64(newValue), 10)
node.Tag = yaml.NodeTagInt
case int32:
node.Value = strconv.FormatInt(int64(newValue), 10)
node.Tag = yaml.NodeTagInt
case int64:
node.Value = strconv.FormatInt(newValue, 10)
node.Tag = yaml.NodeTagInt
case bool:
node.SetString(strconv.FormatBool(newValue))
node.Tag = yaml.NodeTagBool
case float32:
node.SetString(strconv.FormatFloat(float64(newValue), 'f', -1, 32))
node.Tag = yaml.NodeTagFloat
case float64:
node.SetString(strconv.FormatFloat(newValue, 'f', -1, 64))
node.Tag = yaml.NodeTagFloat
default:
node.SetString(newValue.(string))
node.Tag = yaml.NodeTagString
}
node.Style = 0
}
func (f Filter) setScalar(node *yaml.RNode) error {
if !yaml.IsYNodeString(node.YNode()) {
return nil
}
v := DoReplacements(node.YNode().Value, f.MappingFunc)
updateNodeValue(node.YNode(), v)
return nil
}
func (f Filter) setMap(node *yaml.RNode) error {
contents := node.YNode().Content
for i := 0; i < len(contents); i += 2 {
if !yaml.IsYNodeString(contents[i]) {
return fmt.Errorf(
"invalid map key: value='%s', tag='%s'",
contents[i].Value, contents[i].Tag)
}
if !yaml.IsYNodeString(contents[i+1]) {
continue
}
newValue := DoReplacements(contents[i+1].Value, f.MappingFunc)
updateNodeValue(contents[i+1], newValue)
}
return nil
}
func (f Filter) setSeq(node *yaml.RNode) error {
for _, item := range node.YNode().Content {
if !yaml.IsYNodeString(item) {
return fmt.Errorf("invalid value type expect a string")
}
newValue := DoReplacements(item.Value, f.MappingFunc)
updateNodeValue(item, newValue)
}
return nil
}
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