func accept(accepter rules.Accepter, imageResolutionType imagepolicyapi.ImageResolutionType, resolver imageResolver, m meta.ImageReferenceMutator, attr admission.Attributes, excludedRules sets.String) error {
decisions := policyDecisions{}
gr := attr.GetResource().GroupResource()
errs := m.Mutate(func(ref *kapi.ObjectReference) error {
// create the attribute set for this particular reference, if we have never seen the reference
// before
decision, ok := decisions[*ref]
if !ok {
if imagepolicyapi.RequestsResolution(imageResolutionType) {
resolvedAttrs, err := resolver.ResolveObjectReference(ref, attr.GetNamespace())
switch {
case err != nil && imagepolicyapi.FailOnResolutionFailure(imageResolutionType):
// if we had a resolution error and we're supposed to fail, fail
decision.err = err
decision.tested = true
decisions[*ref] = decision
return err
case err != nil:
// if we had an error, but aren't supposed to fail, just don't do anything else and keep track of
// the resolution failure
decision.err = err
case err == nil:
// if we resolved properly, assign the attributes and rewrite the pull spec if we need to
decision.attrs = resolvedAttrs
if imagepolicyapi.RewriteImagePullSpec(imageResolutionType) {
ref.Namespace = ""
ref.Name = decision.attrs.Name.Exact()
ref.Kind = "DockerImage"
}
}
}
// if we don't have any image policy attributes, attempt a best effort parse for the remaining tests
if decision.attrs == nil {
decision.attrs = &rules.ImagePolicyAttributes{}
// an objectref that is DockerImage ref will have a name that corresponds to its pull spec. We can parse that
// to a docker image ref
if ref != nil && ref.Kind == "DockerImage" {
decision.attrs.Name, _ = imageapi.ParseDockerImageReference(ref.Name)
}
}
decision.attrs.Resource = gr
decision.attrs.ExcludedRules = excludedRules
}
// we only need to test a given input once for acceptance
if !decision.tested {
accepted := accepter.Accepts(decision.attrs)
glog.V(5).Infof("Made decision for %v (as: %v, err: %v): %t", ref, decision.attrs.Name, decision.err, accepted)
decision.tested = true
decisions[*ref] = decision
if !accepted {
// if the image is rejected, return the resolution error, if any
if decision.err != nil {
return decision.err
}
return errRejectByPolicy
}
}
return nil
})
for i := range errs {
errs[i].Type = field.ErrorTypeForbidden
if errs[i].Detail != errRejectByPolicy.Error() {
errs[i].Detail = fmt.Sprintf("this image is prohibited by policy: %s", errs[i].Detail)
}
}
if len(errs) > 0 {
glog.V(5).Infof("failed to create: %v", errs)
return apierrs.NewInvalid(attr.GetKind().GroupKind(), attr.GetName(), errs)
}
glog.V(5).Infof("allowed: %#v", attr)
return nil
}
func accept(accepter rules.Accepter, resolver imageResolver, m meta.ImageReferenceMutator, attr admission.Attributes, excludedRules sets.String) error {
var decisions policyDecisions
gr := attr.GetResource().GroupResource()
requiresImage := accepter.RequiresImage(gr)
resolvesImage := accepter.ResolvesImage(gr)
errs := m.Mutate(func(ref *kapi.ObjectReference) error {
// create the attribute set for this particular reference, if we have never seen the reference
// before
decision, ok := decisions[*ref]
if !ok {
var attrs *rules.ImagePolicyAttributes
var err error
if requiresImage || resolvesImage {
// convert the incoming reference into attributes to pass to the accepter
attrs, err = resolver.ResolveObjectReference(ref, attr.GetNamespace())
}
// if the incoming reference is of a Kind that needed a lookup, but that lookup failed,
// use the most generic policy rule here because we don't even know the image name
if attrs == nil {
attrs = &rules.ImagePolicyAttributes{}
// an objectref that is DockerImage ref will have a name that corresponds to its pull spec. We can parse that
// to a docker image ref
if ref != nil && ref.Kind == "DockerImage" {
attrs.Name, _ = imageapi.ParseDockerImageReference(ref.Name)
}
}
attrs.Resource = gr
attrs.ExcludedRules = excludedRules
decision.attrs = attrs
decision.err = err
}
// we only need to test a given input once for acceptance
if !decision.tested {
accepted := accepter.Accepts(decision.attrs)
glog.V(5).Infof("Made decision for %v (as: %v, err: %v): %t", ref, decision.attrs.Name, decision.err, accepted)
// remember this decision for any identical reference
if decisions == nil {
decisions = make(policyDecisions)
}
decision.tested = true
decisions[*ref] = decision
if !accepted {
// if the image is rejected, return the resolution error, if any
if decision.err != nil {
return decision.err
}
return errRejectByPolicy
}
}
// if resolution was requested, and no error was present, transform the
// reference back into a string to a DockerImage
if resolvesImage && decision.err == nil {
ref.Namespace = ""
ref.Name = decision.attrs.Name.Exact()
ref.Kind = "DockerImage"
}
if decision.err != nil {
glog.V(5).Infof("Ignored resolution error for %v: %v", ref, decision.err)
}
return nil
})
for i := range errs {
errs[i].Type = field.ErrorTypeForbidden
if errs[i].Detail != errRejectByPolicy.Error() {
errs[i].Detail = fmt.Sprintf("this image is prohibited by policy: %s", errs[i].Detail)
}
}
if len(errs) > 0 {
glog.V(5).Infof("failed to create: %v", errs)
return apierrs.NewInvalid(attr.GetKind().GroupKind(), attr.GetName(), errs)
}
glog.V(5).Infof("allowed: %#v", attr)
return nil
}