Merge pull request #63893 from jennybuckley/expose-openapi-to-registry3

Automatic merge from submit-queue (batch tested with PRs 64175, 63893). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Expose openapi schema to handlers

**What this PR does / why we need it**:
Build an openapi spec for each api resource handler. This spec will be able to be consumed by server-side apply and server-side openapi validation.
The reason for putting it into master is so we can work on implementing server side validation against the openapi spec as well as server side apply, and it will make merging the server side apply feature branch a smaller, less risky PR

/sig api-machinery
/kind feature
cc @liggitt @lavalamp @seans3 @mbohlool @apelisse

**Release note**:
```release-note
NONE
```

Kubernetes-commit: 28f171bd66937dec8b24a05c4b7a1414432f9fe8

vendor/k8s.io/apimachinery/pkg/apis/meta/v1/generated.proto

@@ -49,6 +49,7 @@ message APIGroup {
   // The server returns only those CIDRs that it thinks that the client can match.
   // For example: the master will return an internal IP CIDR only, if the client reaches the server using an internal IP.
   // Server looks at X-Forwarded-For header or X-Real-Ip header or request.RemoteAddr (in that order) to get the client IP.
+  // +optional
   repeated ServerAddressByClientCIDR serverAddressByClientCIDRs = 4;
 }
 

vendor/k8s.io/apimachinery/pkg/apis/meta/v1/types.go

@@ -799,7 +799,8 @@ type APIGroup struct {
 	// The server returns only those CIDRs that it thinks that the client can match.
 	// For example: the master will return an internal IP CIDR only, if the client reaches the server using an internal IP.
 	// Server looks at X-Forwarded-For header or X-Real-Ip header or request.RemoteAddr (in that order) to get the client IP.
-	ServerAddressByClientCIDRs []ServerAddressByClientCIDR `json:"serverAddressByClientCIDRs" protobuf:"bytes,4,rep,name=serverAddressByClientCIDRs"`
+	// +optional
+	ServerAddressByClientCIDRs []ServerAddressByClientCIDR `json:"serverAddressByClientCIDRs,omitempty" protobuf:"bytes,4,rep,name=serverAddressByClientCIDRs"`
 }
 
 // ServerAddressByClientCIDR helps the client to determine the server address that they should use, depending on the clientCIDR that they match.

vendor/k8s.io/apimachinery/pkg/apis/meta/v1/unstructured/helpers.go

@@ -18,7 +18,6 @@ package unstructured
 
 import (
 	gojson "encoding/json"
-	"errors"
 	"fmt"
 	"io"
 	"strings"
@@ -450,44 +449,3 @@ func (c JSONFallbackEncoder) Encode(obj runtime.Object, w io.Writer) error {
 	}
 	return err
 }
-
-// UnstructuredObjectConverter is an ObjectConverter for use with
-// Unstructured objects. Since it has no schema or type information,
-// it will only succeed for no-op conversions. This is provided as a
-// sane implementation for APIs that require an object converter.
-type UnstructuredObjectConverter struct{}
-
-func (UnstructuredObjectConverter) Convert(in, out, context interface{}) error {
-	unstructIn, ok := in.(*Unstructured)
-	if !ok {
-		return fmt.Errorf("input type %T in not valid for unstructured conversion", in)
-	}
-
-	unstructOut, ok := out.(*Unstructured)
-	if !ok {
-		return fmt.Errorf("output type %T in not valid for unstructured conversion", out)
-	}
-
-	// maybe deep copy the map? It is documented in the
-	// ObjectConverter interface that this function is not
-	// guaranteed to not mutate the input. Or maybe set the input
-	// object to nil.
-	unstructOut.Object = unstructIn.Object
-	return nil
-}
-
-func (UnstructuredObjectConverter) ConvertToVersion(in runtime.Object, target runtime.GroupVersioner) (runtime.Object, error) {
-	if kind := in.GetObjectKind().GroupVersionKind(); !kind.Empty() {
-		gvk, ok := target.KindForGroupVersionKinds([]schema.GroupVersionKind{kind})
-		if !ok {
-			// TODO: should this be a typed error?
-			return nil, fmt.Errorf("%v is unstructured and is not suitable for converting to %q", kind, target)
-		}
-		in.GetObjectKind().SetGroupVersionKind(gvk)
-	}
-	return in, nil
-}
-
-func (UnstructuredObjectConverter) ConvertFieldLabel(version, kind, label, value string) (string, string, error) {
-	return "", "", errors.New("unstructured cannot convert field labels")
-}