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strategy.go
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strategy.go
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package imagestream
import (
"fmt"
"strings"
"github.com/golang/glog"
kerrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/validation/field"
"k8s.io/apiserver/pkg/authentication/user"
apirequest "k8s.io/apiserver/pkg/endpoints/request"
kstorage "k8s.io/apiserver/pkg/storage"
"k8s.io/apiserver/pkg/storage/names"
kapi "k8s.io/kubernetes/pkg/api"
authorizationapi "github.com/openshift/origin/pkg/authorization/apis/authorization"
"github.com/openshift/origin/pkg/authorization/registry/subjectaccessreview"
imageadmission "github.com/openshift/origin/pkg/image/admission"
imageapi "github.com/openshift/origin/pkg/image/apis/image"
"github.com/openshift/origin/pkg/image/apis/image/validation"
)
type ResourceGetter interface {
Get(apirequest.Context, string, *metav1.GetOptions) (runtime.Object, error)
}
// Strategy implements behavior for ImageStreams.
type Strategy struct {
runtime.ObjectTyper
names.NameGenerator
defaultRegistry imageapi.DefaultRegistry
tagVerifier *TagVerifier
limitVerifier imageadmission.LimitVerifier
imageStreamGetter ResourceGetter
}
// NewStrategy is the default logic that applies when creating and updating
// ImageStream objects via the REST API.
func NewStrategy(defaultRegistry imageapi.DefaultRegistry, subjectAccessReviewClient subjectaccessreview.Registry, limitVerifier imageadmission.LimitVerifier, imageStreamGetter ResourceGetter) Strategy {
return Strategy{
ObjectTyper: kapi.Scheme,
NameGenerator: names.SimpleNameGenerator,
defaultRegistry: defaultRegistry,
tagVerifier: &TagVerifier{subjectAccessReviewClient},
limitVerifier: limitVerifier,
imageStreamGetter: imageStreamGetter,
}
}
// NamespaceScoped is true for image streams.
func (s Strategy) NamespaceScoped() bool {
return true
}
// PrepareForCreate clears fields that are not allowed to be set by end users on creation.
func (s Strategy) PrepareForCreate(ctx apirequest.Context, obj runtime.Object) {
stream := obj.(*imageapi.ImageStream)
stream.Status = imageapi.ImageStreamStatus{
DockerImageRepository: s.dockerImageRepository(stream),
Tags: make(map[string]imageapi.TagEventList),
}
stream.Generation = 1
for tag, ref := range stream.Spec.Tags {
ref.Generation = &stream.Generation
stream.Spec.Tags[tag] = ref
}
}
// Validate validates a new image stream and verifies the current user is
// authorized to access any image streams newly referenced in spec.tags.
func (s Strategy) Validate(ctx apirequest.Context, obj runtime.Object) field.ErrorList {
stream := obj.(*imageapi.ImageStream)
var errs field.ErrorList
if err := s.validateTagsAndLimits(ctx, nil, stream); err != nil {
errs = append(errs, field.InternalError(field.NewPath(""), err))
}
errs = append(errs, validation.ValidateImageStream(stream)...)
return errs
}
func (s Strategy) validateTagsAndLimits(ctx apirequest.Context, oldStream, newStream *imageapi.ImageStream) error {
user, ok := apirequest.UserFrom(ctx)
if !ok {
return kerrors.NewForbidden(schema.GroupResource{Resource: "imagestreams"}, newStream.Name, fmt.Errorf("no user context available"))
}
errs := s.tagVerifier.Verify(oldStream, newStream, user)
errs = append(errs, s.tagsChanged(oldStream, newStream)...)
if len(errs) > 0 {
return kerrors.NewInvalid(schema.GroupKind{Kind: "imagestreams"}, newStream.Name, errs)
}
ns, ok := apirequest.NamespaceFrom(ctx)
if !ok {
ns = newStream.Namespace
}
return s.limitVerifier.VerifyLimits(ns, newStream)
}
// AllowCreateOnUpdate is false for image streams.
func (s Strategy) AllowCreateOnUpdate() bool {
return false
}
func (Strategy) AllowUnconditionalUpdate() bool {
return false
}
// dockerImageRepository determines the docker image stream for stream.
// If stream.DockerImageRepository is set, that value is returned. Otherwise,
// if a default registry exists, the value returned is of the form
// <default registry>/<namespace>/<stream name>.
func (s Strategy) dockerImageRepository(stream *imageapi.ImageStream) string {
registry, ok := s.defaultRegistry.DefaultRegistry()
if !ok {
return stream.Spec.DockerImageRepository
}
if len(stream.Namespace) == 0 {
stream.Namespace = metav1.NamespaceDefault
}
ref := imageapi.DockerImageReference{
Registry: registry,
Namespace: stream.Namespace,
Name: stream.Name,
}
return ref.String()
}
func parseFromReference(stream *imageapi.ImageStream, from *kapi.ObjectReference) (string, string, error) {
splitChar := ""
refType := ""
switch from.Kind {
case "ImageStreamTag":
splitChar = ":"
refType = "tag"
case "ImageStreamImage":
splitChar = "@"
refType = "id"
default:
return "", "", fmt.Errorf("invalid from.kind %q - only ImageStreamTag and ImageStreamImage are allowed", from.Kind)
}
parts := strings.Split(from.Name, splitChar)
switch len(parts) {
case 1:
// <tag> or <id>
return stream.Name, from.Name, nil
case 2:
// <stream>:<tag> or <stream>@<id>
return parts[0], parts[1], nil
default:
return "", "", fmt.Errorf("invalid from.name %q - it must be of the form <%s> or <stream>%s<%s>", from.Name, refType, splitChar, refType)
}
}
// tagsChanged updates stream.Status.Tags based on the old and new image stream.
// if the old stream is nil, all tags are considered additions.
func (s Strategy) tagsChanged(old, stream *imageapi.ImageStream) field.ErrorList {
internalRegistry, hasInternalRegistry := s.defaultRegistry.DefaultRegistry()
var errs field.ErrorList
oldTags := map[string]imageapi.TagReference{}
if old != nil && old.Spec.Tags != nil {
oldTags = old.Spec.Tags
}
for tag, tagRef := range stream.Spec.Tags {
if oldRef, ok := oldTags[tag]; ok && !tagRefChanged(oldRef, tagRef, stream.Namespace) {
continue
}
if tagRef.From == nil {
continue
}
glog.V(5).Infof("Detected changed tag %s in %s/%s", tag, stream.Namespace, stream.Name)
generation := stream.Generation
tagRef.Generation = &generation
fromPath := field.NewPath("spec", "tags").Key(tag).Child("from")
if tagRef.From.Kind == "DockerImage" && len(tagRef.From.Name) > 0 {
if tagRef.Reference {
event, err := tagReferenceToTagEvent(stream, tagRef, "")
if err != nil {
errs = append(errs, field.Invalid(fromPath, tagRef.From, err.Error()))
continue
}
stream.Spec.Tags[tag] = tagRef
imageapi.AddTagEventToImageStream(stream, tag, *event)
}
continue
}
tagRefStreamName, tagOrID, err := parseFromReference(stream, tagRef.From)
if err != nil {
errs = append(errs, field.Invalid(fromPath.Child("name"), tagRef.From.Name, "must be of the form <tag>, <repo>:<tag>, <id>, or <repo>@<id>"))
continue
}
streamRef := stream
streamRefNamespace := tagRef.From.Namespace
if len(streamRefNamespace) == 0 {
streamRefNamespace = stream.Namespace
}
if streamRefNamespace != stream.Namespace || tagRefStreamName != stream.Name {
obj, err := s.imageStreamGetter.Get(apirequest.WithNamespace(apirequest.NewContext(), streamRefNamespace), tagRefStreamName, &metav1.GetOptions{})
if err != nil {
if kerrors.IsNotFound(err) {
errs = append(errs, field.NotFound(fromPath.Child("name"), tagRef.From.Name))
} else {
errs = append(errs, field.Invalid(fromPath.Child("name"), tagRef.From.Name, fmt.Sprintf("unable to retrieve image stream: %v", err)))
}
continue
}
streamRef = obj.(*imageapi.ImageStream)
}
event, err := tagReferenceToTagEvent(streamRef, tagRef, tagOrID)
if err != nil {
errs = append(errs, field.Invalid(fromPath.Child("name"), tagRef.From.Name, fmt.Sprintf("error generating tag event: %v", err)))
continue
}
if event == nil {
// referenced tag or ID doesn't exist, which is ok
continue
}
// if this is not a reference tag, and the tag points to the internal registry for the other namespace, alter it to
// point to this stream so that pulls happen from this stream in the future.
if !tagRef.Reference {
if ref, err := imageapi.ParseDockerImageReference(event.DockerImageReference); err == nil {
if hasInternalRegistry && ref.Registry == internalRegistry && ref.Namespace == streamRef.Namespace && ref.Name == streamRef.Name {
ref.Namespace = stream.Namespace
ref.Name = stream.Name
event.DockerImageReference = ref.Exact()
}
}
}
stream.Spec.Tags[tag] = tagRef
imageapi.AddTagEventToImageStream(stream, tag, *event)
}
imageapi.UpdateChangedTrackingTags(stream, old)
// use a consistent timestamp on creation
if old == nil && !stream.CreationTimestamp.IsZero() {
for tag, list := range stream.Status.Tags {
for _, event := range list.Items {
event.Created = stream.CreationTimestamp
}
stream.Status.Tags[tag] = list
}
}
return errs
}
func tagReferenceToTagEvent(stream *imageapi.ImageStream, tagRef imageapi.TagReference, tagOrID string) (*imageapi.TagEvent, error) {
var (
event *imageapi.TagEvent
err error
)
switch tagRef.From.Kind {
case "DockerImage":
event = &imageapi.TagEvent{
Created: metav1.Now(),
DockerImageReference: tagRef.From.Name,
}
case "ImageStreamImage":
event, err = imageapi.ResolveImageID(stream, tagOrID)
case "ImageStreamTag":
event, err = imageapi.LatestTaggedImage(stream, tagOrID), nil
default:
err = fmt.Errorf("invalid from.kind %q: it must be DockerImage, ImageStreamImage or ImageStreamTag", tagRef.From.Kind)
}
if err != nil {
return nil, err
}
if event != nil && tagRef.Generation != nil {
event.Generation = *tagRef.Generation
}
return event, nil
}
// tagRefChanged returns true if the tag ref changed between two spec updates.
func tagRefChanged(old, next imageapi.TagReference, streamNamespace string) bool {
if next.From == nil {
// both fields in next are empty
return false
}
if len(next.From.Kind) == 0 && len(next.From.Name) == 0 {
// invalid
return false
}
oldFrom := old.From
if oldFrom == nil {
oldFrom = &kapi.ObjectReference{}
}
oldNamespace := oldFrom.Namespace
if len(oldNamespace) == 0 {
oldNamespace = streamNamespace
}
nextNamespace := next.From.Namespace
if len(nextNamespace) == 0 {
nextNamespace = streamNamespace
}
if oldNamespace != nextNamespace {
return true
}
if oldFrom.Name != next.From.Name {
return true
}
return tagRefGenerationChanged(old, next)
}
// tagRefGenerationChanged returns true if and only the values were set and the new generation
// is at zero.
func tagRefGenerationChanged(old, next imageapi.TagReference) bool {
switch {
case old.Generation != nil && next.Generation != nil:
if *old.Generation == *next.Generation {
return false
}
if *next.Generation == 0 {
return true
}
return false
default:
return false
}
}
func tagEventChanged(old, next imageapi.TagEvent) bool {
return old.Image != next.Image || old.DockerImageReference != next.DockerImageReference || old.Generation > next.Generation
}
// updateSpecTagGenerationsForUpdate ensures that new spec updates always have a generation set, and that the value
// cannot be updated by an end user (except by setting generation 0).
func updateSpecTagGenerationsForUpdate(stream, oldStream *imageapi.ImageStream) {
for tag, ref := range stream.Spec.Tags {
if ref.Generation != nil && *ref.Generation == 0 {
continue
}
if oldRef, ok := oldStream.Spec.Tags[tag]; ok {
ref.Generation = oldRef.Generation
stream.Spec.Tags[tag] = ref
}
}
}
// ensureSpecTagGenerationsAreSet ensures that all spec tags have a generation set to either 0 or the
// current stream value.
func ensureSpecTagGenerationsAreSet(stream, oldStream *imageapi.ImageStream) {
oldTags := map[string]imageapi.TagReference{}
if oldStream != nil && oldStream.Spec.Tags != nil {
oldTags = oldStream.Spec.Tags
}
// set the generation for any spec tags that have changed, are nil, or are zero
for tag, ref := range stream.Spec.Tags {
if oldRef, ok := oldTags[tag]; !ok || tagRefChanged(oldRef, ref, stream.Namespace) {
ref.Generation = nil
}
if ref.Generation != nil && *ref.Generation != 0 {
continue
}
ref.Generation = &stream.Generation
stream.Spec.Tags[tag] = ref
}
}
// updateObservedGenerationForStatusUpdate ensures every status item has a generation set.
func updateObservedGenerationForStatusUpdate(stream, oldStream *imageapi.ImageStream) {
for tag, newer := range stream.Status.Tags {
if len(newer.Items) == 0 || newer.Items[0].Generation != 0 {
// generation is set, continue
continue
}
older := oldStream.Status.Tags[tag]
if len(older.Items) == 0 || !tagEventChanged(older.Items[0], newer.Items[0]) {
// if the tag wasn't changed by the status update
newer.Items[0].Generation = stream.Generation
stream.Status.Tags[tag] = newer
continue
}
spec, ok := stream.Spec.Tags[tag]
if !ok || spec.Generation == nil {
// if the spec tag has no generation
newer.Items[0].Generation = stream.Generation
stream.Status.Tags[tag] = newer
continue
}
// set the status tag from the spec tag generation
newer.Items[0].Generation = *spec.Generation
stream.Status.Tags[tag] = newer
}
}
type TagVerifier struct {
subjectAccessReviewClient subjectaccessreview.Registry
}
func (v *TagVerifier) Verify(old, stream *imageapi.ImageStream, user user.Info) field.ErrorList {
var errors field.ErrorList
oldTags := map[string]imageapi.TagReference{}
if old != nil && old.Spec.Tags != nil {
oldTags = old.Spec.Tags
}
for tag, tagRef := range stream.Spec.Tags {
if tagRef.From == nil {
continue
}
if len(tagRef.From.Namespace) == 0 {
continue
}
if stream.Namespace == tagRef.From.Namespace {
continue
}
if oldRef, ok := oldTags[tag]; ok && !tagRefChanged(oldRef, tagRef, stream.Namespace) {
continue
}
streamName, _, err := parseFromReference(stream, tagRef.From)
fromPath := field.NewPath("spec", "tags").Key(tag).Child("from")
if err != nil {
errors = append(errors, field.Invalid(fromPath.Child("name"), tagRef.From.Name, "must be of the form <tag>, <repo>:<tag>, <id>, or <repo>@<id>"))
continue
}
// Make sure this user can pull the specified image before allowing them to tag it into another imagestream
subjectAccessReview := authorizationapi.AddUserToSAR(user, &authorizationapi.SubjectAccessReview{
Action: authorizationapi.Action{
Verb: "get",
Group: imageapi.LegacyGroupName,
Resource: "imagestreams/layers",
ResourceName: streamName,
},
})
ctx := apirequest.WithNamespace(apirequest.WithUser(apirequest.NewContext(), user), tagRef.From.Namespace)
glog.V(4).Infof("Performing SubjectAccessReview for user=%s, groups=%v to %s/%s", user.GetName(), user.GetGroups(), tagRef.From.Namespace, streamName)
resp, err := v.subjectAccessReviewClient.CreateSubjectAccessReview(ctx, subjectAccessReview)
if err != nil || resp == nil || (resp != nil && !resp.Allowed) {
message := fmt.Sprintf("%s/%s", tagRef.From.Namespace, streamName)
if resp != nil {
message = message + fmt.Sprintf(": %q %q", resp.Reason, resp.EvaluationError)
}
if err != nil {
message = message + fmt.Sprintf("- %v", err)
}
errors = append(errors, field.Forbidden(fromPath, message))
continue
}
}
return errors
}
// Canonicalize normalizes the object after validation.
func (Strategy) Canonicalize(obj runtime.Object) {
}
func (s Strategy) prepareForUpdate(obj, old runtime.Object, resetStatus bool) {
oldStream := old.(*imageapi.ImageStream)
stream := obj.(*imageapi.ImageStream)
stream.Generation = oldStream.Generation
if resetStatus {
stream.Status = oldStream.Status
}
stream.Status.DockerImageRepository = s.dockerImageRepository(stream)
// ensure that users cannot change spec tag generation to any value except 0
updateSpecTagGenerationsForUpdate(stream, oldStream)
// Any changes to the spec increment the generation number.
//
// TODO: Any changes to a part of the object that represents desired state (labels,
// annotations etc) should also increment the generation.
if !kapi.Semantic.DeepEqual(oldStream.Spec, stream.Spec) || stream.Generation == 0 {
stream.Generation = oldStream.Generation + 1
}
// default spec tag generations afterwards (to avoid updating the generation for legacy objects)
ensureSpecTagGenerationsAreSet(stream, oldStream)
}
func (s Strategy) PrepareForUpdate(ctx apirequest.Context, obj, old runtime.Object) {
s.prepareForUpdate(obj, old, true)
}
// ValidateUpdate is the default update validation for an end user.
func (s Strategy) ValidateUpdate(ctx apirequest.Context, obj, old runtime.Object) field.ErrorList {
stream := obj.(*imageapi.ImageStream)
oldStream := old.(*imageapi.ImageStream)
var errs field.ErrorList
if err := s.validateTagsAndLimits(ctx, oldStream, stream); err != nil {
errs = append(errs, field.InternalError(field.NewPath(""), err))
}
errs = append(errs, validation.ValidateImageStreamUpdate(stream, oldStream)...)
return errs
}
// Decorate decorates stream.Status.DockerImageRepository using the logic from
// dockerImageRepository().
func (s Strategy) Decorate(obj runtime.Object) error {
switch t := obj.(type) {
case *imageapi.ImageStream:
t.Status.DockerImageRepository = s.dockerImageRepository(t)
case *imageapi.ImageStreamList:
for i := range t.Items {
is := &t.Items[i]
is.Status.DockerImageRepository = s.dockerImageRepository(is)
}
default:
return kerrors.NewBadRequest(fmt.Sprintf("not an ImageStream nor ImageStreamList: %v", obj))
}
return nil
}
type StatusStrategy struct {
Strategy
}
// NewStatusStrategy creates a status update strategy around an existing stream
// strategy.
func NewStatusStrategy(strategy Strategy) StatusStrategy {
return StatusStrategy{strategy}
}
// Canonicalize normalizes the object after validation.
func (StatusStrategy) Canonicalize(obj runtime.Object) {
}
func (StatusStrategy) PrepareForUpdate(ctx apirequest.Context, obj, old runtime.Object) {
oldStream := old.(*imageapi.ImageStream)
stream := obj.(*imageapi.ImageStream)
stream.Spec.Tags = oldStream.Spec.Tags
stream.Spec.DockerImageRepository = oldStream.Spec.DockerImageRepository
updateObservedGenerationForStatusUpdate(stream, oldStream)
}
func (s StatusStrategy) ValidateUpdate(ctx apirequest.Context, obj, old runtime.Object) field.ErrorList {
newIS := obj.(*imageapi.ImageStream)
errs := field.ErrorList{}
ns, ok := apirequest.NamespaceFrom(ctx)
if !ok {
ns = newIS.Namespace
}
err := s.limitVerifier.VerifyLimits(ns, newIS)
if err != nil {
errs = append(errs, field.Forbidden(field.NewPath("imageStream"), err.Error()))
}
// TODO: merge valid fields after update
errs = append(errs, validation.ValidateImageStreamStatusUpdate(newIS, old.(*imageapi.ImageStream))...)
return errs
}
// GetAttrs returns labels and fields of a given object for filtering purposes
func GetAttrs(o runtime.Object) (labels.Set, fields.Set, error) {
obj, ok := o.(*imageapi.ImageStream)
if !ok {
return nil, nil, fmt.Errorf("not an ImageStream")
}
return labels.Set(obj.Labels), SelectableFields(obj), nil
}
// Matcher returns a generic matcher for a given label and field selector.
func Matcher(label labels.Selector, field fields.Selector) kstorage.SelectionPredicate {
return kstorage.SelectionPredicate{
Label: label,
Field: field,
GetAttrs: GetAttrs,
}
}
// SelectableFields returns a field set that can be used for filter selection
func SelectableFields(obj *imageapi.ImageStream) fields.Set {
return imageapi.ImageStreamToSelectableFields(obj)
}
// InternalStrategy implements behavior for updating both the spec and status
// of an image stream
type InternalStrategy struct {
Strategy
}
// NewInternalStrategy creates an update strategy around an existing stream
// strategy.
func NewInternalStrategy(strategy Strategy) InternalStrategy {
return InternalStrategy{strategy}
}
// Canonicalize normalizes the object after validation.
func (InternalStrategy) Canonicalize(obj runtime.Object) {
}
func (s InternalStrategy) PrepareForCreate(ctx apirequest.Context, obj runtime.Object) {
stream := obj.(*imageapi.ImageStream)
stream.Status.DockerImageRepository = s.dockerImageRepository(stream)
stream.Generation = 1
for tag, ref := range stream.Spec.Tags {
ref.Generation = &stream.Generation
stream.Spec.Tags[tag] = ref
}
}
func (s InternalStrategy) PrepareForUpdate(ctx apirequest.Context, obj, old runtime.Object) {
s.prepareForUpdate(obj, old, false)
}