/
ast.go
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/
ast.go
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// Copyright Istio 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 ast
import (
"encoding/json"
"fmt"
"sigs.k8s.io/yaml"
"istio.io/istio/pkg/config/validation"
// Force-import a function.
_ "istio.io/istio/pkg/config/validation/envoyfilter"
"istio.io/istio/pkg/util/sets"
"istio.io/istio/pkg/util/strcase"
)
// Metadata is the top-level container.
type Metadata struct {
Resources []*Resource `json:"resources"`
}
var _ json.Unmarshaler = &Metadata{}
// Resource metadata for resources contained within a collection.
type Resource struct {
Identifier string `json:"identifier"`
Group string `json:"group"`
Version string `json:"version"`
VersionAliases []string `json:"versionAliases"`
Kind string `json:"kind"`
Plural string `json:"plural"`
ClusterScoped bool `json:"clusterScoped"`
Builtin bool `json:"builtin"`
Specless bool `json:"specless"`
Synthetic bool `json:"synthetic"`
Proto string `json:"proto"`
ProtoPackage string `json:"protoPackage"`
StatusProto string `json:"statusProto"`
StatusProtoPackage string `json:"statusProtoPackage"`
Validate string `json:"validate"`
Description string `json:"description"`
}
// FindResourceForGroupKind looks up a resource with the given group and kind. Returns nil if not found.
func (m *Metadata) FindResourceForGroupKind(group, kind string) *Resource {
for _, r := range m.Resources {
if r.Group == group && r.Kind == kind {
return r
}
}
return nil
}
// UnmarshalJSON implements json.Unmarshaler
func (m *Metadata) UnmarshalJSON(data []byte) error {
var in struct {
Resources []*Resource `json:"resources"`
}
if err := json.Unmarshal(data, &in); err != nil {
return err
}
m.Resources = in.Resources
seen := sets.New[string]()
// Process resources.
for i, r := range m.Resources {
if r.Validate == "" {
validateFn := "Validate" + asResourceVariableName(r.Kind)
if !validation.IsValidateFunc(validateFn) {
validateFn = "validation.EmptyValidate"
} else {
if r.Kind == "EnvoyFilter" {
validateFn = "envoyfilter." + validateFn
} else {
validateFn = "validation." + validateFn
}
}
m.Resources[i].Validate = validateFn
}
if r.Identifier == "" {
r.Identifier = r.Kind
}
if seen.InsertContains(r.Identifier) {
return fmt.Errorf("identifier %q already registered, set a unique identifier", r.Identifier)
}
}
return nil
}
// Parse and return a yaml representation of Metadata
func Parse(yamlText string) (*Metadata, error) {
var s Metadata
err := yaml.Unmarshal([]byte(yamlText), &s)
if err != nil {
return nil, err
}
return &s, nil
}
func asResourceVariableName(n string) string {
return strcase.CamelCase(n)
}