feat: kubesphere 4.0 (#6115)

* feat: kubesphere 4.0

Signed-off-by: ci-bot <ci-bot@kubesphere.io>

* feat: kubesphere 4.0

Signed-off-by: ci-bot <ci-bot@kubesphere.io>

---------

Signed-off-by: ci-bot <ci-bot@kubesphere.io>
Co-authored-by: ks-ci-bot <ks-ci-bot@example.com>
Co-authored-by: joyceliu <joyceliu@yunify.com>

vendor/k8s.io/apiserver/pkg/cel/library/authz.go

@@ -0,0 +1,626 @@
+/*
+Copyright 2023 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package library
+
+import (
+	"context"
+	"fmt"
+	"reflect"
+	"strings"
+
+	"github.com/google/cel-go/cel"
+	"github.com/google/cel-go/common/types"
+	"github.com/google/cel-go/common/types/ref"
+
+	apimachineryvalidation "k8s.io/apimachinery/pkg/api/validation"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apiserver/pkg/authentication/serviceaccount"
+	"k8s.io/apiserver/pkg/authentication/user"
+	"k8s.io/apiserver/pkg/authorization/authorizer"
+)
+
+// Authz provides a CEL function library extension for performing authorization checks.
+// Note that authorization checks are only supported for CEL expression fields in the API
+// where an 'authorizer' variable is provided to the CEL expression. See the
+// documentation of API fields where CEL expressions are used to learn if the 'authorizer'
+// variable is provided.
+//
+// path
+//
+// Returns a PathCheck configured to check authorization for a non-resource request
+// path (e.g. /healthz). If path is an empty string, an error is returned.
+// Note that the leading '/' is not required.
+//
+//	<Authorizer>.path(<string>) <PathCheck>
+//
+// Examples:
+//
+//	authorizer.path('/healthz') // returns a PathCheck for the '/healthz' API path
+//	authorizer.path('') // results in "path must not be empty" error
+//	authorizer.path('  ') // results in "path must not be empty" error
+//
+// group
+//
+// Returns a GroupCheck configured to check authorization for the API resources for
+// a particular API group.
+// Note that authorization checks are only supported for CEL expression fields in the API
+// where an 'authorizer' variable is provided to the CEL expression. Check the
+// documentation of API fields where CEL expressions are used to learn if the 'authorizer'
+// variable is provided.
+//
+//	<Authorizer>.group(<string>) <GroupCheck>
+//
+// Examples:
+//
+//	authorizer.group('apps') // returns a GroupCheck for the 'apps' API group
+//	authorizer.group('') // returns a GroupCheck for the core API group
+//	authorizer.group('example.com') // returns a GroupCheck for the custom resources in the 'example.com' API group
+//
+// serviceAccount
+//
+// Returns an Authorizer configured to check authorization for the provided service account namespace and name.
+// If the name is not a valid DNS subdomain string (as defined by RFC 1123), an error is returned.
+// If the namespace is not a valid DNS label (as defined by RFC 1123), an error is returned.
+//
+//	<Authorizer>.serviceAccount(<string>, <string>) <Authorizer>
+//
+// Examples:
+//
+//	authorizer.serviceAccount('default', 'myserviceaccount') // returns an Authorizer for the service account with namespace 'default' and name 'myserviceaccount'
+//	authorizer.serviceAccount('not@a#valid!namespace', 'validname') // returns an error
+//	authorizer.serviceAccount('valid.example.com', 'invalid@*name') // returns an error
+//
+// resource
+//
+// Returns a ResourceCheck configured to check authorization for a particular API resource.
+// Note that the provided resource string should be a lower case plural name of a Kubernetes API resource.
+//
+//	<GroupCheck>.resource(<string>) <ResourceCheck>
+//
+// Examples:
+//
+//	authorizer.group('apps').resource('deployments') // returns a ResourceCheck for the 'deployments' resources in the 'apps' group.
+//	authorizer.group('').resource('pods') // returns a ResourceCheck for the 'pods' resources in the core group.
+//	authorizer.group('apps').resource('') // results in "resource must not be empty" error
+//	authorizer.group('apps').resource('  ') // results in "resource must not be empty" error
+//
+// subresource
+//
+// Returns a ResourceCheck configured to check authorization for a particular subresource of an API resource.
+// If subresource is set to "", the subresource field of this ResourceCheck is considered unset.
+//
+//	<ResourceCheck>.subresource(<string>) <ResourceCheck>
+//
+// Examples:
+//
+//	authorizer.group('').resource('pods').subresource('status') // returns a ResourceCheck the 'status' subresource of 'pods'
+//	authorizer.group('apps').resource('deployments').subresource('scale') // returns a ResourceCheck the 'scale' subresource of 'deployments'
+//	authorizer.group('example.com').resource('widgets').subresource('scale') // returns a ResourceCheck for the 'scale' subresource of the 'widgets' custom resource
+//	authorizer.group('example.com').resource('widgets').subresource('') // returns a ResourceCheck for the 'widgets' resource.
+//
+// namespace
+//
+// Returns a ResourceCheck configured to check authorization for a particular namespace.
+// For cluster scoped resources, namespace() does not need to be called; namespace defaults
+// to "", which is the correct namespace value to use to check cluster scoped resources.
+// If namespace is set to "", the ResourceCheck will check authorization for the cluster scope.
+//
+//	<ResourceCheck>.namespace(<string>) <ResourceCheck>
+//
+// Examples:
+//
+//	authorizer.group('apps').resource('deployments').namespace('test') // returns a ResourceCheck for 'deployments' in the 'test' namespace
+//	authorizer.group('').resource('pods').namespace('default') // returns a ResourceCheck for 'pods' in the 'default' namespace
+//	authorizer.group('').resource('widgets').namespace('') // returns a ResourceCheck for 'widgets' in the cluster scope
+//
+// name
+//
+// Returns a ResourceCheck configured to check authorization for a particular resource name.
+// If name is set to "", the name field of this ResourceCheck is considered unset.
+//
+//	<ResourceCheck>.name(<name>) <ResourceCheck>
+//
+// Examples:
+//
+//	authorizer.group('apps').resource('deployments').namespace('test').name('backend') // returns a ResourceCheck for the 'backend' 'deployments' resource in the 'test' namespace
+//	authorizer.group('apps').resource('deployments').namespace('test').name('') // returns a ResourceCheck for the 'deployments' resource in the 'test' namespace
+//
+// check
+//
+// For PathCheck, checks if the principal (user or service account) that sent the request is authorized for the HTTP request verb of the path.
+// For ResourceCheck, checks if the principal (user or service account) that sent the request is authorized for the API verb and the configured authorization checks of the ResourceCheck.
+// The check operation can be expensive, particularly in clusters using the webhook authorization mode.
+//
+//	<PathCheck>.check(<check>) <Decision>
+//	<ResourceCheck>.check(<check>) <Decision>
+//
+// Examples:
+//
+//	authorizer.group('').resource('pods').namespace('default').check('create') // Checks if the principal (user or service account) is authorized create pods in the 'default' namespace.
+//	authorizer.path('/healthz').check('get') // Checks if the principal (user or service account) is authorized to make HTTP GET requests to the /healthz API path.
+//
+// allowed
+//
+// Returns true if the authorizer's decision for the check is "allow".  Note that if the authorizer's decision is
+// "no opinion", that the 'allowed' function will return false.
+//
+//	<Decision>.allowed() <bool>
+//
+// Examples:
+//
+//	authorizer.group('').resource('pods').namespace('default').check('create').allowed() // Returns true if the principal (user or service account) is allowed create pods in the 'default' namespace.
+//	authorizer.path('/healthz').check('get').allowed()  // Returns true if the principal (user or service account) is allowed to make HTTP GET requests to the /healthz API path.
+//
+// reason
+//
+// Returns a string reason for the authorization decision
+//
+//	<Decision>.reason() <string>
+//
+// Examples:
+//
+//	authorizer.path('/healthz').check('GET').reason()
+//
+// errored
+//
+// Returns true if the authorization check resulted in an error.
+//
+//	<Decision>.errored() <bool>
+//
+// Examples:
+//
+//	authorizer.group('').resource('pods').namespace('default').check('create').errored() // Returns true if the authorization check resulted in an error
+//
+// error
+//
+// If the authorization check resulted in an error, returns the error. Otherwise, returns the empty string.
+//
+//	<Decision>.error() <string>
+//
+// Examples:
+//
+//	authorizer.group('').resource('pods').namespace('default').check('create').error()
+func Authz() cel.EnvOption {
+	return cel.Lib(authzLib)
+}
+
+var authzLib = &authz{}
+
+type authz struct{}
+
+func (*authz) LibraryName() string {
+	return "k8s.authz"
+}
+
+var authzLibraryDecls = map[string][]cel.FunctionOpt{
+	"path": {
+		cel.MemberOverload("authorizer_path", []*cel.Type{AuthorizerType, cel.StringType}, PathCheckType,
+			cel.BinaryBinding(authorizerPath))},
+	"group": {
+		cel.MemberOverload("authorizer_group", []*cel.Type{AuthorizerType, cel.StringType}, GroupCheckType,
+			cel.BinaryBinding(authorizerGroup))},
+	"serviceAccount": {
+		cel.MemberOverload("authorizer_serviceaccount", []*cel.Type{AuthorizerType, cel.StringType, cel.StringType}, AuthorizerType,
+			cel.FunctionBinding(authorizerServiceAccount))},
+	"resource": {
+		cel.MemberOverload("groupcheck_resource", []*cel.Type{GroupCheckType, cel.StringType}, ResourceCheckType,
+			cel.BinaryBinding(groupCheckResource))},
+	"subresource": {
+		cel.MemberOverload("resourcecheck_subresource", []*cel.Type{ResourceCheckType, cel.StringType}, ResourceCheckType,
+			cel.BinaryBinding(resourceCheckSubresource))},
+	"namespace": {
+		cel.MemberOverload("resourcecheck_namespace", []*cel.Type{ResourceCheckType, cel.StringType}, ResourceCheckType,
+			cel.BinaryBinding(resourceCheckNamespace))},
+	"name": {
+		cel.MemberOverload("resourcecheck_name", []*cel.Type{ResourceCheckType, cel.StringType}, ResourceCheckType,
+			cel.BinaryBinding(resourceCheckName))},
+	"check": {
+		cel.MemberOverload("pathcheck_check", []*cel.Type{PathCheckType, cel.StringType}, DecisionType,
+			cel.BinaryBinding(pathCheckCheck)),
+		cel.MemberOverload("resourcecheck_check", []*cel.Type{ResourceCheckType, cel.StringType}, DecisionType,
+			cel.BinaryBinding(resourceCheckCheck))},
+	"errored": {
+		cel.MemberOverload("decision_errored", []*cel.Type{DecisionType}, cel.BoolType,
+			cel.UnaryBinding(decisionErrored))},
+	"error": {
+		cel.MemberOverload("decision_error", []*cel.Type{DecisionType}, cel.StringType,
+			cel.UnaryBinding(decisionError))},
+	"allowed": {
+		cel.MemberOverload("decision_allowed", []*cel.Type{DecisionType}, cel.BoolType,
+			cel.UnaryBinding(decisionAllowed))},
+	"reason": {
+		cel.MemberOverload("decision_reason", []*cel.Type{DecisionType}, cel.StringType,
+			cel.UnaryBinding(decisionReason))},
+}
+
+func (*authz) CompileOptions() []cel.EnvOption {
+	options := make([]cel.EnvOption, 0, len(authzLibraryDecls))
+	for name, overloads := range authzLibraryDecls {
+		options = append(options, cel.Function(name, overloads...))
+	}
+	return options
+}
+
+func (*authz) ProgramOptions() []cel.ProgramOption {
+	return []cel.ProgramOption{}
+}
+
+func authorizerPath(arg1, arg2 ref.Val) ref.Val {
+	authz, ok := arg1.(authorizerVal)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg1)
+	}
+
+	path, ok := arg2.Value().(string)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg1)
+	}
+
+	if len(strings.TrimSpace(path)) == 0 {
+		return types.NewErr("path must not be empty")
+	}
+
+	return authz.pathCheck(path)
+}
+
+func authorizerGroup(arg1, arg2 ref.Val) ref.Val {
+	authz, ok := arg1.(authorizerVal)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg1)
+	}
+
+	group, ok := arg2.Value().(string)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg1)
+	}
+
+	return authz.groupCheck(group)
+}
+
+func authorizerServiceAccount(args ...ref.Val) ref.Val {
+	argn := len(args)
+	if argn != 3 {
+		return types.NoSuchOverloadErr()
+	}
+
+	authz, ok := args[0].(authorizerVal)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(args[0])
+	}
+
+	namespace, ok := args[1].Value().(string)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(args[1])
+	}
+
+	name, ok := args[2].Value().(string)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(args[2])
+	}
+
+	if errors := apimachineryvalidation.ValidateServiceAccountName(name, false); len(errors) > 0 {
+		return types.NewErr("Invalid service account name")
+	}
+	if errors := apimachineryvalidation.ValidateNamespaceName(namespace, false); len(errors) > 0 {
+		return types.NewErr("Invalid service account namespace")
+	}
+	return authz.serviceAccount(namespace, name)
+}
+
+func groupCheckResource(arg1, arg2 ref.Val) ref.Val {
+	groupCheck, ok := arg1.(groupCheckVal)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg1)
+	}
+
+	resource, ok := arg2.Value().(string)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg1)
+	}
+
+	if len(strings.TrimSpace(resource)) == 0 {
+		return types.NewErr("resource must not be empty")
+	}
+	return groupCheck.resourceCheck(resource)
+}
+
+func resourceCheckSubresource(arg1, arg2 ref.Val) ref.Val {
+	resourceCheck, ok := arg1.(resourceCheckVal)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg1)
+	}
+
+	subresource, ok := arg2.Value().(string)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg1)
+	}
+
+	result := resourceCheck
+	result.subresource = subresource
+	return result
+}
+
+func resourceCheckNamespace(arg1, arg2 ref.Val) ref.Val {
+	resourceCheck, ok := arg1.(resourceCheckVal)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg1)
+	}
+
+	namespace, ok := arg2.Value().(string)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg1)
+	}
+
+	result := resourceCheck
+	result.namespace = namespace
+	return result
+}
+
+func resourceCheckName(arg1, arg2 ref.Val) ref.Val {
+	resourceCheck, ok := arg1.(resourceCheckVal)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg1)
+	}
+
+	name, ok := arg2.Value().(string)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg1)
+	}
+
+	result := resourceCheck
+	result.name = name
+	return result
+}
+
+func pathCheckCheck(arg1, arg2 ref.Val) ref.Val {
+	pathCheck, ok := arg1.(pathCheckVal)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg1)
+	}
+
+	httpRequestVerb, ok := arg2.Value().(string)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg1)
+	}
+
+	return pathCheck.Authorize(context.TODO(), httpRequestVerb)
+}
+
+func resourceCheckCheck(arg1, arg2 ref.Val) ref.Val {
+	resourceCheck, ok := arg1.(resourceCheckVal)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg1)
+	}
+
+	apiVerb, ok := arg2.Value().(string)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg1)
+	}
+
+	return resourceCheck.Authorize(context.TODO(), apiVerb)
+}
+
+func decisionErrored(arg ref.Val) ref.Val {
+	decision, ok := arg.(decisionVal)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+
+	return types.Bool(decision.err != nil)
+}
+
+func decisionError(arg ref.Val) ref.Val {
+	decision, ok := arg.(decisionVal)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+
+	if decision.err == nil {
+		return types.String("")
+	}
+	return types.String(decision.err.Error())
+}
+
+func decisionAllowed(arg ref.Val) ref.Val {
+	decision, ok := arg.(decisionVal)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+
+	return types.Bool(decision.authDecision == authorizer.DecisionAllow)
+}
+
+func decisionReason(arg ref.Val) ref.Val {
+	decision, ok := arg.(decisionVal)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+
+	return types.String(decision.reason)
+}
+
+var (
+	AuthorizerType    = cel.ObjectType("kubernetes.authorization.Authorizer")
+	PathCheckType     = cel.ObjectType("kubernetes.authorization.PathCheck")
+	GroupCheckType    = cel.ObjectType("kubernetes.authorization.GroupCheck")
+	ResourceCheckType = cel.ObjectType("kubernetes.authorization.ResourceCheck")
+	DecisionType      = cel.ObjectType("kubernetes.authorization.Decision")
+)
+
+// Resource represents an API resource
+type Resource interface {
+	// GetName returns the name of the object as presented in the request.  On a CREATE operation, the client
+	// may omit name and rely on the server to generate the name.  If that is the case, this method will return
+	// the empty string
+	GetName() string
+	// GetNamespace is the namespace associated with the request (if any)
+	GetNamespace() string
+	// GetResource is the name of the resource being requested.  This is not the kind.  For example: pods
+	GetResource() schema.GroupVersionResource
+	// GetSubresource is the name of the subresource being requested.  This is a different resource, scoped to the parent resource, but it may have a different kind.
+	// For instance, /pods has the resource "pods" and the kind "Pod", while /pods/foo/status has the resource "pods", the sub resource "status", and the kind "Pod"
+	// (because status operates on pods). The binding resource for a pod though may be /pods/foo/binding, which has resource "pods", subresource "binding", and kind "Binding".
+	GetSubresource() string
+}
+
+func NewAuthorizerVal(userInfo user.Info, authorizer authorizer.Authorizer) ref.Val {
+	return authorizerVal{receiverOnlyObjectVal: receiverOnlyVal(AuthorizerType), userInfo: userInfo, authAuthorizer: authorizer}
+}
+
+func NewResourceAuthorizerVal(userInfo user.Info, authorizer authorizer.Authorizer, requestResource Resource) ref.Val {
+	a := authorizerVal{receiverOnlyObjectVal: receiverOnlyVal(AuthorizerType), userInfo: userInfo, authAuthorizer: authorizer}
+	resource := requestResource.GetResource()
+	g := a.groupCheck(resource.Group)
+	r := g.resourceCheck(resource.Resource)
+	r.subresource = requestResource.GetSubresource()
+	r.namespace = requestResource.GetNamespace()
+	r.name = requestResource.GetName()
+	return r
+}
+
+type authorizerVal struct {
+	receiverOnlyObjectVal
+	userInfo       user.Info
+	authAuthorizer authorizer.Authorizer
+}
+
+func (a authorizerVal) pathCheck(path string) pathCheckVal {
+	return pathCheckVal{receiverOnlyObjectVal: receiverOnlyVal(PathCheckType), authorizer: a, path: path}
+}
+
+func (a authorizerVal) groupCheck(group string) groupCheckVal {
+	return groupCheckVal{receiverOnlyObjectVal: receiverOnlyVal(GroupCheckType), authorizer: a, group: group}
+}
+
+func (a authorizerVal) serviceAccount(namespace, name string) authorizerVal {
+	sa := &serviceaccount.ServiceAccountInfo{Name: name, Namespace: namespace}
+	return authorizerVal{
+		receiverOnlyObjectVal: receiverOnlyVal(AuthorizerType),
+		userInfo:              sa.UserInfo(),
+		authAuthorizer:        a.authAuthorizer,
+	}
+}
+
+type pathCheckVal struct {
+	receiverOnlyObjectVal
+	authorizer authorizerVal
+	path       string
+}
+
+func (a pathCheckVal) Authorize(ctx context.Context, verb string) ref.Val {
+	attr := &authorizer.AttributesRecord{
+		Path: a.path,
+		Verb: verb,
+		User: a.authorizer.userInfo,
+	}
+
+	decision, reason, err := a.authorizer.authAuthorizer.Authorize(ctx, attr)
+	return newDecision(decision, err, reason)
+}
+
+type groupCheckVal struct {
+	receiverOnlyObjectVal
+	authorizer authorizerVal
+	group      string
+}
+
+func (g groupCheckVal) resourceCheck(resource string) resourceCheckVal {
+	return resourceCheckVal{receiverOnlyObjectVal: receiverOnlyVal(ResourceCheckType), groupCheck: g, resource: resource}
+}
+
+type resourceCheckVal struct {
+	receiverOnlyObjectVal
+	groupCheck  groupCheckVal
+	resource    string
+	subresource string
+	namespace   string
+	name        string
+}
+
+func (a resourceCheckVal) Authorize(ctx context.Context, verb string) ref.Val {
+	attr := &authorizer.AttributesRecord{
+		ResourceRequest: true,
+		APIGroup:        a.groupCheck.group,
+		APIVersion:      "*",
+		Resource:        a.resource,
+		Subresource:     a.subresource,
+		Namespace:       a.namespace,
+		Name:            a.name,
+		Verb:            verb,
+		User:            a.groupCheck.authorizer.userInfo,
+	}
+	decision, reason, err := a.groupCheck.authorizer.authAuthorizer.Authorize(ctx, attr)
+	return newDecision(decision, err, reason)
+}
+
+func newDecision(authDecision authorizer.Decision, err error, reason string) decisionVal {
+	return decisionVal{receiverOnlyObjectVal: receiverOnlyVal(DecisionType), authDecision: authDecision, err: err, reason: reason}
+}
+
+type decisionVal struct {
+	receiverOnlyObjectVal
+	err          error
+	authDecision authorizer.Decision
+	reason       string
+}
+
+// receiverOnlyObjectVal provides an implementation of ref.Val for
+// any object type that has receiver functions but does not expose any fields to
+// CEL.
+type receiverOnlyObjectVal struct {
+	typeValue *types.Type
+}
+
+// receiverOnlyVal returns a receiverOnlyObjectVal for the given type.
+func receiverOnlyVal(objectType *cel.Type) receiverOnlyObjectVal {
+	return receiverOnlyObjectVal{typeValue: types.NewTypeValue(objectType.String())}
+}
+
+// ConvertToNative implements ref.Val.ConvertToNative.
+func (a receiverOnlyObjectVal) ConvertToNative(typeDesc reflect.Type) (any, error) {
+	return nil, fmt.Errorf("type conversion error from '%s' to '%v'", a.typeValue.String(), typeDesc)
+}
+
+// ConvertToType implements ref.Val.ConvertToType.
+func (a receiverOnlyObjectVal) ConvertToType(typeVal ref.Type) ref.Val {
+	switch typeVal {
+	case a.typeValue:
+		return a
+	case types.TypeType:
+		return a.typeValue
+	}
+	return types.NewErr("type conversion error from '%s' to '%s'", a.typeValue, typeVal)
+}
+
+// Equal implements ref.Val.Equal.
+func (a receiverOnlyObjectVal) Equal(other ref.Val) ref.Val {
+	o, ok := other.(receiverOnlyObjectVal)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(other)
+	}
+	return types.Bool(a == o)
+}
+
+// Type implements ref.Val.Type.
+func (a receiverOnlyObjectVal) Type() ref.Type {
+	return a.typeValue
+}
+
+// Value implements ref.Val.Value.
+func (a receiverOnlyObjectVal) Value() any {
+	return types.NoSuchOverloadErr()
+}

vendor/k8s.io/apiserver/pkg/cel/library/cost.go

@@ -36,6 +36,15 @@ type CostEstimator struct {
 
 func (l *CostEstimator) CallCost(function, overloadId string, args []ref.Val, result ref.Val) *uint64 {
 	switch function {
+	case "check":
+		// An authorization check has a fixed cost
+		// This cost is set to allow for only two authorization checks per expression
+		cost := uint64(350000)
+		return &cost
+	case "serviceAccount", "path", "group", "resource", "subresource", "namespace", "name", "allowed", "reason", "error", "errored":
+		// All authorization builder and accessor functions have a nominal cost
+		cost := uint64(1)
+		return &cost
 	case "isSorted", "sum", "max", "min", "indexOf", "lastIndexOf":
 		var cost uint64
 		if len(args) > 0 {
@@ -78,6 +87,13 @@ func (l *CostEstimator) EstimateCallCost(function, overloadId string, target *ch
 	// WARNING: Any changes to this code impact API compatibility! The estimated cost is used to determine which CEL rules may be written to a
 	// CRD and any change (cost increases and cost decreases) are breaking.
 	switch function {
+	case "check":
+		// An authorization check has a fixed cost
+		// This cost is set to allow for only two authorization checks per expression
+		return &checker.CallEstimate{CostEstimate: checker.CostEstimate{Min: 350000, Max: 350000}}
+	case "serviceAccount", "path", "group", "resource", "subresource", "namespace", "name", "allowed", "reason", "error", "errored":
+		// All authorization builder and accessor functions have a nominal cost
+		return &checker.CallEstimate{CostEstimate: checker.CostEstimate{Min: 1, Max: 1}}
 	case "isSorted", "sum", "max", "min", "indexOf", "lastIndexOf":
 		if target != nil {
 			// Charge 1 cost for comparing each element in the list
@@ -85,8 +101,8 @@ func (l *CostEstimator) EstimateCallCost(function, overloadId string, target *ch
 			// If the list contains strings or bytes, add the cost of traversing all the strings/bytes as a way
 			// of estimating the additional comparison cost.
 			if elNode := l.listElementNode(*target); elNode != nil {
-				t := elNode.Type().GetPrimitive()
-				if t == exprpb.Type_STRING || t == exprpb.Type_BYTES {
+				k := elNode.Type().Kind()
+				if k == types.StringKind || k == types.BytesKind {
 					sz := l.sizeEstimate(elNode)
 					elCost = elCost.Add(sz.MultiplyByCostFactor(common.StringTraversalCostFactor))
 				}
@@ -94,7 +110,6 @@ func (l *CostEstimator) EstimateCallCost(function, overloadId string, target *ch
 			} else { // the target is a string, which is supported by indexOf and lastIndexOf
 				return &checker.CallEstimate{CostEstimate: l.sizeEstimate(*target).MultiplyByCostFactor(common.StringTraversalCostFactor)}
 			}
-
 		}
 	case "url":
 		if len(args) == 1 {
@@ -111,13 +126,51 @@ func (l *CostEstimator) EstimateCallCost(function, overloadId string, target *ch
 			sz := l.sizeEstimate(*target)
 			toReplaceSz := l.sizeEstimate(args[0])
 			replaceWithSz := l.sizeEstimate(args[1])
-			// smallest possible result: smallest input size composed of the largest possible substrings being replaced by smallest possible replacement
-			minSz := uint64(math.Ceil(float64(sz.Min)/float64(toReplaceSz.Max))) * replaceWithSz.Min
-			// largest possible result: largest input size composed of the smallest possible substrings being replaced by largest possible replacement
-			maxSz := uint64(math.Ceil(float64(sz.Max)/float64(toReplaceSz.Min))) * replaceWithSz.Max
+
+			var replaceCount, retainedSz checker.SizeEstimate
+			// find the longest replacement:
+			if toReplaceSz.Min == 0 {
+				// if the string being replaced is empty, replace surrounds all characters in the input string with the replacement.
+				if sz.Max < math.MaxUint64 {
+					replaceCount.Max = sz.Max + 1
+				} else {
+					replaceCount.Max = sz.Max
+				}
+				// Include the length of the longest possible original string length.
+				retainedSz.Max = sz.Max
+			} else if replaceWithSz.Max <= toReplaceSz.Min {
+				// If the replacement does not make the result longer, use the original string length.
+				replaceCount.Max = 0
+				retainedSz.Max = sz.Max
+			} else {
+				// Replace the smallest possible substrings with the largest possible replacement
+				// as many times as possible.
+				replaceCount.Max = uint64(math.Ceil(float64(sz.Max) / float64(toReplaceSz.Min)))
+			}
+
+			// find the shortest replacement:
+			if toReplaceSz.Max == 0 {
+				// if the string being replaced is empty, replace surrounds all characters in the input string with the replacement.
+				if sz.Min < math.MaxUint64 {
+					replaceCount.Min = sz.Min + 1
+				} else {
+					replaceCount.Min = sz.Min
+				}
+				// Include the length of the shortest possible original string length.
+				retainedSz.Min = sz.Min
+			} else if toReplaceSz.Max <= replaceWithSz.Min {
+				// If the replacement does not make the result shorter, use the original string length.
+				replaceCount.Min = 0
+				retainedSz.Min = sz.Min
+			} else {
+				// Replace the largest possible substrings being with the smallest possible replacement
+				// as many times as possible.
+				replaceCount.Min = uint64(math.Ceil(float64(sz.Min) / float64(toReplaceSz.Max)))
+			}
+			size := replaceCount.Multiply(replaceWithSz).Add(retainedSz)
 
 			// cost is the traversal plus the construction of the result
-			return &checker.CallEstimate{CostEstimate: sz.MultiplyByCostFactor(2 * common.StringTraversalCostFactor), ResultSize: &checker.SizeEstimate{Min: minSz, Max: maxSz}}
+			return &checker.CallEstimate{CostEstimate: sz.MultiplyByCostFactor(2 * common.StringTraversalCostFactor), ResultSize: &size}
 		}
 	case "split":
 		if target != nil {
@@ -194,7 +247,8 @@ func (l *CostEstimator) sizeEstimate(t checker.AstNode) checker.SizeEstimate {
 }
 
 func (l *CostEstimator) listElementNode(list checker.AstNode) checker.AstNode {
-	if lt := list.Type().GetListType(); lt != nil {
+	if params := list.Type().Parameters(); len(params) > 0 {
+		lt := params[0]
 		nodePath := list.Path()
 		if nodePath != nil {
 			// Provide path if we have it so that a OpenAPIv3 maxLength validation can be looked up, if it exists
@@ -202,10 +256,10 @@ func (l *CostEstimator) listElementNode(list checker.AstNode) checker.AstNode {
 			path := make([]string, len(nodePath)+1)
 			copy(path, nodePath)
 			path[len(nodePath)] = "@items"
-			return &itemsNode{path: path, t: lt.GetElemType(), expr: nil}
+			return &itemsNode{path: path, t: lt, expr: nil}
 		} else {
 			// Provide just the type if no path is available so that worst case size can be looked up based on type.
-			return &itemsNode{t: lt.GetElemType(), expr: nil}
+			return &itemsNode{t: lt, expr: nil}
 		}
 	}
 	return nil
@@ -220,7 +274,7 @@ func (l *CostEstimator) EstimateSize(element checker.AstNode) *checker.SizeEstim
 
 type itemsNode struct {
 	path []string
-	t    *exprpb.Type
+	t    *types.Type
 	expr *exprpb.Expr
 }
 
@@ -228,7 +282,7 @@ func (i *itemsNode) Path() []string {
 	return i.path
 }
 
-func (i *itemsNode) Type() *exprpb.Type {
+func (i *itemsNode) Type() *types.Type {
 	return i.t
 }
 

vendor/k8s.io/apiserver/pkg/cel/library/libraries.go

@@ -1,34 +0,0 @@
-/*
-Copyright 2022 The Kubernetes Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package library
-
-import (
-	"github.com/google/cel-go/cel"
-	"github.com/google/cel-go/ext"
-	"github.com/google/cel-go/interpreter"
-)
-
-// ExtensionLibs declares the set of CEL extension libraries available everywhere CEL is used in Kubernetes.
-var ExtensionLibs = append(k8sExtensionLibs, ext.Strings())
-
-var k8sExtensionLibs = []cel.EnvOption{
-	URLs(),
-	Regex(),
-	Lists(),
-}
-
-var ExtensionLibRegexOptimizations = []*interpreter.RegexOptimization{FindRegexOptimization, FindAllRegexOptimization}

vendor/k8s.io/apiserver/pkg/cel/library/lists.go

@@ -95,6 +95,10 @@ var listsLib = &lists{}
 
 type lists struct{}
 
+func (*lists) LibraryName() string {
+	return "k8s.lists"
+}
+
 var paramA = cel.TypeParamType("A")
 
 // CEL typeParams can be used to constraint to a specific trait (e.g. traits.ComparableType) if the 1st operand is the type to constrain.

vendor/k8s.io/apiserver/pkg/cel/library/quantity.go

@@ -0,0 +1,380 @@
+/*
+Copyright 2023 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package library
+
+import (
+	"errors"
+
+	"github.com/google/cel-go/cel"
+	"github.com/google/cel-go/common/types"
+	"github.com/google/cel-go/common/types/ref"
+
+	"k8s.io/apimachinery/pkg/api/resource"
+	apiservercel "k8s.io/apiserver/pkg/cel"
+)
+
+// Quantity provides a CEL function library extension of Kubernetes
+// resource.Quantity parsing functions. See `resource.Quantity`
+// documentation for more detailed information about the format itself:
+// https://pkg.go.dev/k8s.io/apimachinery/pkg/api/resource#Quantity
+//
+// quantity
+//
+// Converts a string to a Quantity or results in an error if the string is not a valid Quantity. Refer
+// to resource.Quantity documentation for information on accepted patterns.
+//
+//	quantity(<string>) <Quantity>
+//
+// Examples:
+//
+//	quantity('1.5G') // returns a Quantity
+//	quantity('200k') // returns a Quantity
+//	quantity('200K') // error
+//	quantity('Three') // error
+//	quantity('Mi') // error
+//
+// isQuantity
+//
+// Returns true if a string is a valid Quantity. isQuantity returns true if and
+// only if quantity does not result in error.
+//
+//	isQuantity( <string>) <bool>
+//
+// Examples:
+//
+//	isQuantity('1.3G') // returns true
+//	isQuantity('1.3Gi') // returns true
+//	isQuantity('1,3G') // returns false
+//	isQuantity('10000k') // returns true
+//	isQuantity('200K') // returns false
+//	isQuantity('Three') // returns false
+//	isQuantity('Mi') // returns false
+//
+// Conversion to Scalars:
+//
+//   - isInteger: returns true if and only if asInteger is safe to call without an error
+//
+//   - asInteger: returns a representation of the current value as an int64 if
+//     possible or results in an error if conversion would result in overflow
+//	   or loss of precision.
+//
+//   - asApproximateFloat: returns a float64 representation of the quantity which may
+//     lose precision. If the value of the quantity is outside the range of a float64
+//     +Inf/-Inf will be returned.
+//
+//     <Quantity>.isInteger() <bool>
+//     <Quantity>.asInteger() <int>
+//     <Quantity>.asApproximateFloat() <float>
+//
+// Examples:
+//
+// quantity("50000000G").isInteger() // returns true
+// quantity("50k").isInteger() // returns true
+// quantity("9999999999999999999999999999999999999G").asInteger() // error: cannot convert value to integer
+// quantity("9999999999999999999999999999999999999G").isInteger() // returns false
+// quantity("50k").asInteger() == 50000 // returns true
+// quantity("50k").sub(20000).asApproximateFloat() == 30000 // returns true
+//
+// Arithmetic
+//
+//   - sign: Returns `1` if the quantity is positive, `-1` if it is negative. `0` if it is zero
+//
+//   - add: Returns sum of two quantities or a quantity and an integer
+//
+//   - sub: Returns difference between two quantities or a quantity and an integer
+//
+//     <Quantity>.sign() <int>
+//     <Quantity>.add(<quantity>) <quantity>
+//     <Quantity>.add(<integer>) <quantity>
+//     <Quantity>.sub(<quantity>) <quantity>
+//     <Quantity>.sub(<integer>) <quantity>
+//
+// Examples:
+//
+// quantity("50k").add("20k") == quantity("70k") // returns true
+// quantity("50k").add(20) == quantity("50020") // returns true
+// quantity("50k").sub("20k") == quantity("30k") // returns true
+// quantity("50k").sub(20000) == quantity("30k") // returns true
+// quantity("50k").add(20).sub(quantity("100k")).sub(-50000) == quantity("20") // returns true
+//
+// Comparisons
+//
+//   - isGreaterThan: Returns true if and only if the receiver is greater than the operand
+//
+//   - isLessThan: Returns true if and only if the receiver is less than the operand
+//
+//   - compareTo: Compares receiver to operand and returns 0 if they are equal, 1 if the receiver is greater, or -1 if the receiver is less than the operand
+//
+//
+//     <Quantity>.isLessThan(<quantity>) <bool>
+//     <Quantity>.isGreaterThan(<quantity>) <bool>
+//     <Quantity>.compareTo(<quantity>) <int>
+//
+// Examples:
+//
+// quantity("200M").compareTo(quantity("0.2G")) // returns 0
+// quantity("50M").compareTo(quantity("50Mi")) // returns -1
+// quantity("50Mi").compareTo(quantity("50M")) // returns 1
+// quantity("150Mi").isGreaterThan(quantity("100Mi")) // returns true
+// quantity("50Mi").isGreaterThan(quantity("100Mi")) // returns false
+// quantity("50M").isLessThan(quantity("100M")) // returns true
+// quantity("100M").isLessThan(quantity("50M")) // returns false
+
+func Quantity() cel.EnvOption {
+	return cel.Lib(quantityLib)
+}
+
+var quantityLib = &quantity{}
+
+type quantity struct{}
+
+func (*quantity) LibraryName() string {
+	return "k8s.quantity"
+}
+
+var quantityLibraryDecls = map[string][]cel.FunctionOpt{
+	"quantity": {
+		cel.Overload("string_to_quantity", []*cel.Type{cel.StringType}, apiservercel.QuantityType, cel.UnaryBinding((stringToQuantity))),
+	},
+	"isQuantity": {
+		cel.Overload("is_quantity_string", []*cel.Type{cel.StringType}, cel.BoolType, cel.UnaryBinding(isQuantity)),
+	},
+	"sign": {
+		cel.Overload("quantity_sign", []*cel.Type{apiservercel.QuantityType}, cel.IntType, cel.UnaryBinding(quantityGetSign)),
+	},
+	"isGreaterThan": {
+		cel.MemberOverload("quantity_is_greater_than", []*cel.Type{apiservercel.QuantityType, apiservercel.QuantityType}, cel.BoolType, cel.BinaryBinding(quantityIsGreaterThan)),
+	},
+	"isLessThan": {
+		cel.MemberOverload("quantity_is_less_than", []*cel.Type{apiservercel.QuantityType, apiservercel.QuantityType}, cel.BoolType, cel.BinaryBinding(quantityIsLessThan)),
+	},
+	"compareTo": {
+		cel.MemberOverload("quantity_compare_to", []*cel.Type{apiservercel.QuantityType, apiservercel.QuantityType}, cel.IntType, cel.BinaryBinding(quantityCompareTo)),
+	},
+	"asApproximateFloat": {
+		cel.MemberOverload("quantity_get_float", []*cel.Type{apiservercel.QuantityType}, cel.DoubleType, cel.UnaryBinding(quantityGetApproximateFloat)),
+	},
+	"asInteger": {
+		cel.MemberOverload("quantity_get_int", []*cel.Type{apiservercel.QuantityType}, cel.IntType, cel.UnaryBinding(quantityGetValue)),
+	},
+	"isInteger": {
+		cel.MemberOverload("quantity_is_integer", []*cel.Type{apiservercel.QuantityType}, cel.BoolType, cel.UnaryBinding(quantityCanValue)),
+	},
+	"add": {
+		cel.MemberOverload("quantity_add", []*cel.Type{apiservercel.QuantityType, apiservercel.QuantityType}, apiservercel.QuantityType, cel.BinaryBinding(quantityAdd)),
+		cel.MemberOverload("quantity_add_int", []*cel.Type{apiservercel.QuantityType, cel.IntType}, apiservercel.QuantityType, cel.BinaryBinding(quantityAddInt)),
+	},
+	"sub": {
+		cel.MemberOverload("quantity_sub", []*cel.Type{apiservercel.QuantityType, apiservercel.QuantityType}, apiservercel.QuantityType, cel.BinaryBinding(quantitySub)),
+		cel.MemberOverload("quantity_sub_int", []*cel.Type{apiservercel.QuantityType, cel.IntType}, apiservercel.QuantityType, cel.BinaryBinding(quantitySubInt)),
+	},
+}
+
+func (*quantity) CompileOptions() []cel.EnvOption {
+	options := make([]cel.EnvOption, 0, len(quantityLibraryDecls))
+	for name, overloads := range quantityLibraryDecls {
+		options = append(options, cel.Function(name, overloads...))
+	}
+	return options
+}
+
+func (*quantity) ProgramOptions() []cel.ProgramOption {
+	return []cel.ProgramOption{}
+}
+
+func isQuantity(arg ref.Val) ref.Val {
+	str, ok := arg.Value().(string)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+
+	_, err := resource.ParseQuantity(str)
+	if err != nil {
+		return types.Bool(false)
+	}
+
+	return types.Bool(true)
+}
+
+func stringToQuantity(arg ref.Val) ref.Val {
+	str, ok := arg.Value().(string)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+
+	q, err := resource.ParseQuantity(str)
+	if err != nil {
+		return types.WrapErr(err)
+	}
+
+	return apiservercel.Quantity{Quantity: &q}
+}
+
+func quantityGetApproximateFloat(arg ref.Val) ref.Val {
+	q, ok := arg.Value().(*resource.Quantity)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+	return types.Double(q.AsApproximateFloat64())
+}
+
+func quantityCanValue(arg ref.Val) ref.Val {
+	q, ok := arg.Value().(*resource.Quantity)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+	_, success := q.AsInt64()
+	return types.Bool(success)
+}
+
+func quantityGetValue(arg ref.Val) ref.Val {
+	q, ok := arg.Value().(*resource.Quantity)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+	v, success := q.AsInt64()
+	if !success {
+		return types.WrapErr(errors.New("cannot convert value to integer"))
+	}
+	return types.Int(v)
+}
+
+func quantityGetSign(arg ref.Val) ref.Val {
+	q, ok := arg.Value().(*resource.Quantity)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+	return types.Int(q.Sign())
+}
+
+func quantityIsGreaterThan(arg ref.Val, other ref.Val) ref.Val {
+	q, ok := arg.Value().(*resource.Quantity)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+
+	q2, ok := other.Value().(*resource.Quantity)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+
+	return types.Bool(q.Cmp(*q2) == 1)
+}
+
+func quantityIsLessThan(arg ref.Val, other ref.Val) ref.Val {
+	q, ok := arg.Value().(*resource.Quantity)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+
+	q2, ok := other.Value().(*resource.Quantity)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+
+	return types.Bool(q.Cmp(*q2) == -1)
+}
+
+func quantityCompareTo(arg ref.Val, other ref.Val) ref.Val {
+	q, ok := arg.Value().(*resource.Quantity)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+
+	q2, ok := other.Value().(*resource.Quantity)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+
+	return types.Int(q.Cmp(*q2))
+}
+
+func quantityAdd(arg ref.Val, other ref.Val) ref.Val {
+	q, ok := arg.Value().(*resource.Quantity)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+
+	q2, ok := other.Value().(*resource.Quantity)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+
+	copy := *q
+	copy.Add(*q2)
+	return &apiservercel.Quantity{
+		Quantity: &copy,
+	}
+}
+
+func quantityAddInt(arg ref.Val, other ref.Val) ref.Val {
+	q, ok := arg.Value().(*resource.Quantity)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+
+	q2, ok := other.Value().(int64)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+
+	q2Converted := *resource.NewQuantity(q2, resource.DecimalExponent)
+
+	copy := *q
+	copy.Add(q2Converted)
+	return &apiservercel.Quantity{
+		Quantity: &copy,
+	}
+}
+
+func quantitySub(arg ref.Val, other ref.Val) ref.Val {
+	q, ok := arg.Value().(*resource.Quantity)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+
+	q2, ok := other.Value().(*resource.Quantity)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+
+	copy := *q
+	copy.Sub(*q2)
+	return &apiservercel.Quantity{
+		Quantity: &copy,
+	}
+}
+
+func quantitySubInt(arg ref.Val, other ref.Val) ref.Val {
+	q, ok := arg.Value().(*resource.Quantity)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+
+	q2, ok := other.Value().(int64)
+	if !ok {
+		return types.MaybeNoSuchOverloadErr(arg)
+	}
+
+	q2Converted := *resource.NewQuantity(q2, resource.DecimalExponent)
+
+	copy := *q
+	copy.Sub(q2Converted)
+	return &apiservercel.Quantity{
+		Quantity: &copy,
+	}
+}

vendor/k8s.io/apiserver/pkg/cel/library/regex.go

@@ -51,6 +51,10 @@ var regexLib = &regex{}
 
 type regex struct{}
 
+func (*regex) LibraryName() string {
+	return "k8s.regex"
+}
+
 var regexLibraryDecls = map[string][]cel.FunctionOpt{
 	"find": {
 		cel.MemberOverload("string_find_string", []*cel.Type{cel.StringType, cel.StringType}, cel.StringType,
@@ -77,7 +81,9 @@ func (*regex) CompileOptions() []cel.EnvOption {
 }
 
 func (*regex) ProgramOptions() []cel.ProgramOption {
-	return []cel.ProgramOption{}
+	return []cel.ProgramOption{
+		cel.OptimizeRegex(FindRegexOptimization, FindAllRegexOptimization),
+	}
 }
 
 func find(strVal ref.Val, regexVal ref.Val) ref.Val {

vendor/k8s.io/apiserver/pkg/cel/library/test.go

@@ -0,0 +1,83 @@
+/*
+Copyright 2023 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package library
+
+import (
+	"math"
+
+	"github.com/google/cel-go/cel"
+	"github.com/google/cel-go/common/types"
+	"github.com/google/cel-go/common/types/ref"
+)
+
+// Test provides a test() function that returns true.
+func Test(options ...TestOption) cel.EnvOption {
+	t := &testLib{version: math.MaxUint32}
+	for _, o := range options {
+		t = o(t)
+	}
+	return cel.Lib(t)
+}
+
+type testLib struct {
+	version uint32
+}
+
+func (*testLib) LibraryName() string {
+	return "k8s.test"
+}
+
+type TestOption func(*testLib) *testLib
+
+func TestVersion(version uint32) func(lib *testLib) *testLib {
+	return func(sl *testLib) *testLib {
+		sl.version = version
+		return sl
+	}
+}
+
+func (t *testLib) CompileOptions() []cel.EnvOption {
+	var options []cel.EnvOption
+
+	if t.version == 0 {
+		options = append(options, cel.Function("test",
+			cel.Overload("test", []*cel.Type{}, cel.BoolType,
+				cel.FunctionBinding(func(args ...ref.Val) ref.Val {
+					return types.True
+				}))))
+	}
+
+	if t.version >= 1 {
+		options = append(options, cel.Function("test",
+			cel.Overload("test", []*cel.Type{}, cel.BoolType,
+				cel.FunctionBinding(func(args ...ref.Val) ref.Val {
+					// Return false here so tests can observe which version of the function is registered
+					// Actual function libraries must not break backward compatibility
+					return types.False
+				}))))
+		options = append(options, cel.Function("testV1",
+			cel.Overload("testV1", []*cel.Type{}, cel.BoolType,
+				cel.FunctionBinding(func(args ...ref.Val) ref.Val {
+					return types.True
+				}))))
+	}
+	return options
+}
+
+func (*testLib) ProgramOptions() []cel.ProgramOption {
+	return []cel.ProgramOption{}
+}

vendor/k8s.io/apiserver/pkg/cel/library/urls.go

@@ -61,9 +61,9 @@ import (
 //
 //   - getScheme: If absent in the URL, returns an empty string.
 //
-//   - getHostname: IPv6 addresses are returned with braces, e.g. "[::1]". If absent in the URL, returns an empty string.
+//   - getHostname: IPv6 addresses are returned without braces, e.g. "::1". If absent in the URL, returns an empty string.
 //
-//   - getHost: IPv6 addresses are returned without braces, e.g. "::1". If absent in the URL, returns an empty string.
+//   - getHost: IPv6 addresses are returned with braces, e.g. "[::1]". If absent in the URL, returns an empty string.
 //
 //   - getEscapedPath: The string returned by getEscapedPath is URL escaped, e.g. "with space" becomes "with%20space".
 //     If absent in the URL, returns an empty string.
@@ -112,6 +112,10 @@ var urlsLib = &urls{}
 
 type urls struct{}
 
+func (*urls) LibraryName() string {
+	return "k8s.urls"
+}
+
 var urlLibraryDecls = map[string][]cel.FunctionOpt{
 	"url": {
 		cel.Overload("string_to_url", []*cel.Type{cel.StringType}, apiservercel.URLType,