OpenAPIv3 maxLength tests with Kubernetes CRDs

about_v1alpha1_clusterproperty-doesnotfit.yaml

apiVersion: about.x-k8s.io/v1alpha1
kind: ClusterProperty
metadata:
  name: clusterproperty-doesnotfit
spec:
  value: "🇺🇸🇺🇸"

about_v1alpha1_clusterproperty-fits.yaml

apiVersion: about.x-k8s.io/v1alpha1
kind: ClusterProperty
metadata:
  name: clusterproperty-fits
spec:
  value: "🇺🇸"

crd.out

lauralorenz@lauralorenz:samples$ kubectl config current-context
kind-kind
lauralorenz@lauralorenz:samples$ kubectl get crds
NAME                               CREATED AT
clusterproperties.about.x-k8s.io   2022-03-07T22:58:19Z
lauralorenz@lauralorenz:samples$ kubectl describe crds clusterproperties.about.x-k8s.io
Name:         clusterproperties.about.x-k8s.io
Namespace:    
Labels:       <none>
Annotations:  controller-gen.kubebuilder.io/version: v0.8.0
API Version:  apiextensions.k8s.io/v1
Kind:         CustomResourceDefinition
Metadata:
  Creation Timestamp:  2022-03-07T22:58:19Z
  Generation:          1
  Managed Fields:
    API Version:  apiextensions.k8s.io/v1
    Fields Type:  FieldsV1
    fieldsV1:
      f:status:
        f:acceptedNames:
          f:kind:
          f:listKind:
          f:plural:
          f:singular:
        f:conditions:
          k:{"type":"Established"}:
            .:
            f:lastTransitionTime:
            f:message:
            f:reason:
            f:status:
            f:type:
          k:{"type":"NamesAccepted"}:
            .:
            f:lastTransitionTime:
            f:message:
            f:reason:
            f:status:
            f:type:
    Manager:      Go-http-client
    Operation:    Update
    Subresource:  status
    Time:         2022-03-07T22:58:19Z
    API Version:  apiextensions.k8s.io/v1
    Fields Type:  FieldsV1
    fieldsV1:
      f:metadata:
        f:annotations:
          .:
          f:controller-gen.kubebuilder.io/version:
          f:kubectl.kubernetes.io/last-applied-configuration:
      f:spec:
        f:conversion:
          .:
          f:strategy:
        f:group:
        f:names:
          f:kind:
          f:listKind:
          f:plural:
          f:singular:
        f:scope:
        f:versions:
    Manager:         kubectl-client-side-apply
    Operation:       Update
    Time:            2022-03-07T22:58:19Z
  Resource Version:  4990
  UID:               14c3df78-a2bb-49df-9168-bc5a48c6c27d
Spec:
  Conversion:
    Strategy:  None
  Group:       about.x-k8s.io
  Names:
    Kind:       ClusterProperty
    List Kind:  ClusterPropertyList
    Plural:     clusterproperties
    Singular:   clusterproperty
  Scope:        Cluster
  Versions:
    Name:  v1alpha1
    Schema:
      openAPIV3Schema:
        Description:  ClusterProperty is the Schema for the clusterproperties API
        Properties:
          API Version:
            Description:  APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources
            Type:         string
          Kind:
            Description:  Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds
            Type:         string
          Metadata:
            Type:  object
          Spec:
            Description:  ClusterPropertySpec defines the desired state of ClusterProperty
            Properties:
              Name:
                Description:  ClusterProperty Name
                Type:         string
              Value:
                Description:  ClusterProperty value
                Max Length:   3
                Min Length:   1
                Type:         string
            Required:
              value
            Type:  object
          Status:
            Description:  ClusterPropertyStatus defines the observed state of ClusterProperty
            Type:         object
        Type:             object
    Served:               true
    Storage:              true
    Subresources:
      Status:
Status:
  Accepted Names:
    Kind:       ClusterProperty
    List Kind:  ClusterPropertyList
    Plural:     clusterproperties
    Singular:   clusterproperty
  Conditions:
    Last Transition Time:  2022-03-07T22:58:19Z
    Message:               no conflicts found
    Reason:                NoConflicts
    Status:                True
    Type:                  NamesAccepted
    Last Transition Time:  2022-03-07T22:58:19Z
    Message:               the initial names have been accepted
    Reason:                InitialNamesAccepted
    Status:                True
    Type:                  Established
  Stored Versions:
    v1alpha1
Events:  <none>

encoding.py

lauralorenz@lauralorenz:samples$ python3
Python 3.9.9 (main, Jan 12 2022, 16:10:51) 
[GCC 11.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> src = open("about_v1alpha1_clusterproperty-fits.yaml", "r", encoding="utf-8") # text mode is implicit, will decode against `encoding` when it needs to
>>> src_s = src.read()
>>> print(src_s)
apiVersion: about.x-k8s.io/v1alpha1
kind: ClusterProperty
metadata:
  name: clusterproperty-fits
spec:
  value: "🇺🇸"

>>> dest = open("about_v1alpha1_clusterproperty-fits-utf32.yaml", "wb") # b = binary mode, will not encode for you
>>> dest.write(src_s.encode("utf-32"))
472
>>> dest.close()
>>> exit()

samples.out

lauralorenz@lauralorenz:samples$ ls
about_v1alpha1_clusterproperty-doesnotfit-utf32.yaml  about_v1alpha1_clusterproperty-fits-utf16.yaml  about_v1alpha1_clusterproperty-fits.yaml
about_v1alpha1_clusterproperty-doesnotfit.yaml        about_v1alpha1_clusterproperty-fits-utf32.yaml
lauralorenz@lauralorenz:samples$ kubectl apply -f about_v1alpha1_clusterproperty-fits.yaml 
clusterproperty.about.x-k8s.io/clusterproperty-fits created
lauralorenz@lauralorenz:samples$ kubectl apply -f about_v1alpha1_clusterproperty-doesnotfit.yaml 
The ClusterProperty "clusterproperty-doesnotfit" is invalid: spec.value: Invalid value: "🇺🇸🇺🇸": spec.value in body should be at most 3 chars long
lauralorenz@lauralorenz:samples$ kubectl apply -f about_v1alpha1_clusterproperty-fits-utf16.yaml 
clusterproperty.about.x-k8s.io/clusterproperty-fits unchanged
lauralorenz@lauralorenz:samples$ kubectl apply -f about_v1alpha1_clusterproperty-fits-utf32.yaml 
error: error parsing about_v1alpha1_clusterproperty-fits-utf32.yaml: error converting YAML to JSON: yaml: control characters are not allowed