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load.go
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load.go
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package config
import (
"errors"
"fmt"
"io/fs"
"os"
"path/filepath"
"github.com/kyverno/chainsaw/pkg/apis/v1alpha1"
"github.com/kyverno/chainsaw/pkg/apis/v1alpha2"
"github.com/kyverno/chainsaw/pkg/data"
configvalidation "github.com/kyverno/chainsaw/pkg/validation/config"
"github.com/kyverno/pkg/ext/resource/convert"
"github.com/kyverno/pkg/ext/resource/loader"
"github.com/kyverno/pkg/ext/yaml"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/validation/field"
"k8s.io/client-go/openapi"
"sigs.k8s.io/kubectl-validate/pkg/openapiclient"
)
const (
DefaultFileName = ".chainsaw.yaml"
)
type (
splitter = func([]byte) ([][]byte, error)
loaderFactory = func(openapi.Client) (loader.Loader, error)
converter = func(schema.GroupVersionKind, unstructured.Unstructured) (*v1alpha1.Configuration, error)
validator = func(obj *v1alpha1.Configuration) field.ErrorList
)
var (
configuration_v1alpha1 = v1alpha1.SchemeGroupVersion.WithKind("Configuration")
configuration_v1alpha2 = v1alpha2.SchemeGroupVersion.WithKind("Configuration")
)
func Load(path string) (*v1alpha1.Configuration, error) {
content, err := os.ReadFile(filepath.Clean(path))
if err != nil {
return nil, err
}
config, err := LoadBytes(content)
if err != nil {
return nil, fmt.Errorf("failed to load configuration (%w)", err)
}
return config, nil
}
func LoadBytes(content []byte) (*v1alpha1.Configuration, error) {
configs, err := Parse(content)
if err != nil {
return nil, err
}
if len(configs) == 0 {
return nil, errors.New("found no configuration")
}
if len(configs) != 1 {
return nil, fmt.Errorf("found multiple configurations (%d)", len(configs))
}
return configs[0], nil
}
func Parse(content []byte) ([]*v1alpha1.Configuration, error) {
return parse(content, nil, nil, nil, nil)
}
func parse(content []byte, splitter splitter, loaderFactory loaderFactory, converter converter, validator validator) ([]*v1alpha1.Configuration, error) {
if splitter == nil {
splitter = yaml.SplitDocuments
}
if loaderFactory == nil {
loaderFactory = loader.New
}
if converter == nil {
converter = defaultConverter
}
if validator == nil {
validator = configvalidation.ValidateConfiguration
}
documents, err := splitter(content)
if err != nil {
return nil, err
}
var configs []*v1alpha1.Configuration
// TODO: no need to allocate a validator every time
fs, err := fs.Sub(data.Crds(), data.CrdsFolder)
if err != nil {
return nil, err
}
loader, err := loaderFactory(openapiclient.NewLocalCRDFiles(fs))
if err != nil {
return nil, err
}
for _, document := range documents {
gvk, untyped, err := loader.Load(document)
if err != nil {
return nil, err
}
config, err := converter(gvk, untyped)
if err != nil {
return nil, err
}
if err := validator(config).ToAggregate(); err != nil {
return nil, err
}
configs = append(configs, config)
}
return configs, nil
}
func defaultConverter(gvk schema.GroupVersionKind, untyped unstructured.Unstructured) (*v1alpha1.Configuration, error) {
scheme := runtime.NewScheme()
if err := v1alpha2.Install(scheme); err != nil {
return nil, err
}
var out v1alpha1.Configuration
switch gvk {
case configuration_v1alpha1:
if err := convert.Into(untyped, &out); err != nil {
return nil, err
}
case configuration_v1alpha2:
if err := scheme.Convert(&untyped, &out, nil); err != nil {
return nil, err
}
default:
return nil, fmt.Errorf("type not supported %s", gvk)
}
return &out, nil
}