/
filters.go
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/
filters.go
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// Copyright 2019 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0
package filters
import (
goerrors "errors"
"fmt"
"sort"
"strings"
"sigs.k8s.io/kustomize/kyaml/kio"
"sigs.k8s.io/kustomize/kyaml/kio/kioutil"
"sigs.k8s.io/kustomize/kyaml/yaml"
)
// Filters are the list of known filters for unmarshalling a filter into a concrete
// implementation.
var Filters = map[string]func() kio.Filter{
"FileSetter": func() kio.Filter { return &FileSetter{} },
"FormatFilter": func() kio.Filter { return &FormatFilter{} },
"GrepFilter": func() kio.Filter { return GrepFilter{} },
"MatchModifier": func() kio.Filter { return &MatchModifyFilter{} },
"Modifier": func() kio.Filter { return &Modifier{} },
}
// filter wraps a kio.filter so that it can be unmarshalled from yaml.
type KFilter struct {
kio.Filter
}
func (t KFilter) MarshalYAML() (interface{}, error) {
return t.Filter, nil
}
func (t *KFilter) UnmarshalYAML(unmarshal func(interface{}) error) error {
i := map[string]interface{}{}
if err := unmarshal(i); err != nil {
return err
}
meta := &yaml.ResourceMeta{}
if err := unmarshal(meta); err != nil {
return err
}
filter, found := Filters[meta.Kind]
if !found {
var knownFilters []string
for k := range Filters {
knownFilters = append(knownFilters, k)
}
sort.Strings(knownFilters)
return fmt.Errorf("unsupported filter Kind %v: may be one of: [%s]",
meta, strings.Join(knownFilters, ","))
}
t.Filter = filter()
return unmarshal(t.Filter)
}
// Modifier modifies the input Resources by invoking the provided pipeline.
// Modifier will return any Resources for which the pipeline does not return an error.
type Modifier struct {
Kind string `yaml:"kind,omitempty"`
Filters yaml.YFilters `yaml:"pipeline,omitempty"`
}
var _ kio.Filter = &Modifier{}
func (f Modifier) Filter(input []*yaml.RNode) ([]*yaml.RNode, error) {
for i := range input {
if _, err := input[i].Pipe(f.Filters.Filters()...); err != nil {
return nil, err
}
}
return input, nil
}
type MatchModifyFilter struct {
Kind string `yaml:"kind,omitempty"`
MatchFilters []yaml.YFilters `yaml:"match,omitempty"`
ModifyFilters yaml.YFilters `yaml:"modify,omitempty"`
}
var _ kio.Filter = &MatchModifyFilter{}
func (f MatchModifyFilter) Filter(input []*yaml.RNode) ([]*yaml.RNode, error) {
matches := input
var err error
for _, filter := range f.MatchFilters {
matches, err = MatchFilter{Filters: filter}.Filter(matches)
if err != nil && !goerrors.Is(err, &kio.Results{}) {
return nil, err
}
}
_, err = Modifier{Filters: f.ModifyFilters}.Filter(matches)
if err != nil {
return nil, err
}
return input, nil
}
type MatchFilter struct {
Kind string `yaml:"kind,omitempty"`
Filters yaml.YFilters `yaml:"pipeline,omitempty"`
}
var _ kio.Filter = &MatchFilter{}
func (f MatchFilter) Filter(input []*yaml.RNode) ([]*yaml.RNode, error) {
var output []*yaml.RNode
for i := range input {
if v, err := input[i].Pipe(f.Filters.Filters()...); err != nil {
return nil, err
} else if v == nil {
continue
}
output = append(output, input[i])
}
return output, nil
}
type FilenameFmtVerb string
const (
// KindFmt substitutes kind
KindFmt FilenameFmtVerb = "%k"
// NameFmt substitutes metadata.name
NameFmt FilenameFmtVerb = "%n"
// NamespaceFmt substitutes metdata.namespace
NamespaceFmt FilenameFmtVerb = "%s"
)
// FileSetter sets the file name and mode annotations on Resources.
type FileSetter struct {
Kind string `yaml:"kind,omitempty"`
// FilenamePattern is the pattern to use for generating filenames. FilenameFmtVerb
// FielnameFmtVerbs may be specified to substitute Resource metadata into the filename.
FilenamePattern string `yaml:"filenamePattern,omitempty"`
// Mode is the filemode to write.
Mode string `yaml:"mode,omitempty"`
// Override will override the existing filename if it is set on the pattern.
// Otherwise the existing filename is kept.
Override bool `yaml:"override,omitempty"`
}
var _ kio.Filter = &FileSetter{}
const DefaultFilenamePattern = "%n_%k.yaml"
func (f *FileSetter) Filter(input []*yaml.RNode) ([]*yaml.RNode, error) {
if f.Mode == "" {
f.Mode = fmt.Sprintf("%d", 0600)
}
if f.FilenamePattern == "" {
f.FilenamePattern = DefaultFilenamePattern
}
resources := map[string][]*yaml.RNode{}
for i := range input {
if err := kioutil.CopyLegacyAnnotations(input[i]); err != nil {
return nil, err
}
m, err := input[i].GetMeta()
if err != nil {
return nil, err
}
file := f.FilenamePattern
file = strings.ReplaceAll(file, string(KindFmt), strings.ToLower(m.Kind))
file = strings.ReplaceAll(file, string(NameFmt), strings.ToLower(m.Name))
file = strings.ReplaceAll(file, string(NamespaceFmt), strings.ToLower(m.Namespace))
if _, found := m.Annotations[kioutil.PathAnnotation]; !found || f.Override {
if _, err := input[i].Pipe(yaml.SetAnnotation(kioutil.PathAnnotation, file)); err != nil {
return nil, err
}
if _, err := input[i].Pipe(yaml.SetAnnotation(kioutil.LegacyPathAnnotation, file)); err != nil {
return nil, err
}
}
resources[file] = append(resources[file], input[i])
}
var output []*yaml.RNode
for i := range resources {
if err := kioutil.SortNodes(resources[i]); err != nil {
return nil, err
}
for j := range resources[i] {
if _, err := resources[i][j].Pipe(
yaml.SetAnnotation(kioutil.IndexAnnotation, fmt.Sprintf("%d", j))); err != nil {
return nil, err
}
if _, err := resources[i][j].Pipe(
yaml.SetAnnotation(kioutil.LegacyIndexAnnotation, fmt.Sprintf("%d", j))); err != nil {
return nil, err
}
output = append(output, resources[i][j])
}
}
return output, nil
}