Golang api.Kind函数代码示例

func describerMap(c *client.Client, kclient kclient.Interface, host string) map[unversioned.GroupKind]kctl.Describer {
	m := map[unversioned.GroupKind]kctl.Describer{
		buildapi.Kind("Build"):                        &BuildDescriber{c, kclient},
		buildapi.Kind("BuildConfig"):                  &BuildConfigDescriber{c, host},
		deployapi.Kind("DeploymentConfig"):            &DeploymentConfigDescriber{c, kclient, nil},
		authorizationapi.Kind("Identity"):             &IdentityDescriber{c},
		imageapi.Kind("Image"):                        &ImageDescriber{c},
		imageapi.Kind("ImageStream"):                  &ImageStreamDescriber{c},
		imageapi.Kind("ImageStreamTag"):               &ImageStreamTagDescriber{c},
		imageapi.Kind("ImageStreamImage"):             &ImageStreamImageDescriber{c},
		routeapi.Kind("Route"):                        &RouteDescriber{c, kclient},
		projectapi.Kind("Project"):                    &ProjectDescriber{c, kclient},
		templateapi.Kind("Template"):                  &TemplateDescriber{c, meta.NewAccessor(), kapi.Scheme, nil},
		authorizationapi.Kind("Policy"):               &PolicyDescriber{c},
		authorizationapi.Kind("PolicyBinding"):        &PolicyBindingDescriber{c},
		authorizationapi.Kind("RoleBinding"):          &RoleBindingDescriber{c},
		authorizationapi.Kind("Role"):                 &RoleDescriber{c},
		authorizationapi.Kind("ClusterPolicy"):        &ClusterPolicyDescriber{c},
		authorizationapi.Kind("ClusterPolicyBinding"): &ClusterPolicyBindingDescriber{c},
		authorizationapi.Kind("ClusterRoleBinding"):   &ClusterRoleBindingDescriber{c},
		authorizationapi.Kind("ClusterRole"):          &ClusterRoleDescriber{c},
		oauthapi.Kind("OAuthAccessToken"):             &OAuthAccessTokenDescriber{c},
		userapi.Kind("User"):                          &UserDescriber{c},
		userapi.Kind("Group"):                         &GroupDescriber{c.Groups()},
		userapi.Kind("UserIdentityMapping"):           &UserIdentityMappingDescriber{c},
		quotaapi.Kind("ClusterResourceQuota"):         &ClusterQuotaDescriber{c},
		quotaapi.Kind("AppliedClusterResourceQuota"):  &AppliedClusterQuotaDescriber{c},
	}
	return m
}

// Create transforms a LocalSAR into an ClusterSAR that is requesting a namespace.  That collapses the code paths.
// LocalSubjectAccessReview exists to allow clean expression of policy.
func (r *REST) Create(ctx kapi.Context, obj runtime.Object) (runtime.Object, error) {
	localSAR, ok := obj.(*authorizationapi.LocalSubjectAccessReview)
	if !ok {
		return nil, kapierrors.NewBadRequest(fmt.Sprintf("not a localSubjectAccessReview: %#v", obj))
	}
	if errs := authorizationvalidation.ValidateLocalSubjectAccessReview(localSAR); len(errs) > 0 {
		return nil, kapierrors.NewInvalid(authorizationapi.Kind(localSAR.Kind), "", errs)
	}
	if namespace := kapi.NamespaceValue(ctx); len(namespace) == 0 {
		return nil, kapierrors.NewBadRequest(fmt.Sprintf("namespace is required on this type: %v", namespace))
	} else if (len(localSAR.Action.Namespace) > 0) && (namespace != localSAR.Action.Namespace) {
		return nil, field.Invalid(field.NewPath("namespace"), localSAR.Action.Namespace, fmt.Sprintf("namespace must be: %v", namespace))
	}

	// transform this into a SubjectAccessReview
	clusterSAR := &authorizationapi.SubjectAccessReview{
		Action: localSAR.Action,
		User:   localSAR.User,
		Groups: localSAR.Groups,
		Scopes: localSAR.Scopes,
	}
	clusterSAR.Action.Namespace = kapi.NamespaceValue(ctx)

	return r.clusterSARRegistry.CreateSubjectAccessReview(kapi.WithNamespace(ctx, ""), clusterSAR)
}

// Create registers a given new ResourceAccessReview instance to r.registry.
func (r *REST) Create(ctx kapi.Context, obj runtime.Object) (runtime.Object, error) {
	resourceAccessReview, ok := obj.(*authorizationapi.ResourceAccessReview)
	if !ok {
		return nil, kapierrors.NewBadRequest(fmt.Sprintf("not a resourceAccessReview: %#v", obj))
	}
	if errs := authorizationvalidation.ValidateResourceAccessReview(resourceAccessReview); len(errs) > 0 {
		return nil, kapierrors.NewInvalid(authorizationapi.Kind(resourceAccessReview.Kind), "", errs)
	}
	// if a namespace is present on the request, then the namespace on the on the RAR is overwritten.
	// This is to support backwards compatibility.  To have gotten here in this state, it means that
	// the authorizer decided that a user could run an RAR against this namespace
	if namespace := kapi.NamespaceValue(ctx); len(namespace) > 0 {
		resourceAccessReview.Action.Namespace = namespace

	} else if err := r.isAllowed(ctx, resourceAccessReview); err != nil {
		// this check is mutually exclusive to the condition above.  localSAR and localRAR both clear the namespace before delegating their calls
		// We only need to check if the RAR is allowed **again** if the authorizer didn't already approve the request for a legacy call.
		return nil, err
	}

	requestContext := kapi.WithNamespace(ctx, resourceAccessReview.Action.Namespace)
	attributes := authorizer.ToDefaultAuthorizationAttributes(resourceAccessReview.Action)
	users, groups, err := r.authorizer.GetAllowedSubjects(requestContext, attributes)

	response := &authorizationapi.ResourceAccessReviewResponse{
		Namespace: resourceAccessReview.Action.Namespace,
		Users:     users,
		Groups:    groups,
	}
	if err != nil {
		response.EvaluationError = err.Error()
	}

	return response, nil
}

// Create registers a given new ResourceAccessReview instance to r.registry.
func (r *REST) Create(ctx kapi.Context, obj runtime.Object) (runtime.Object, error) {
	subjectAccessReview, ok := obj.(*authorizationapi.SubjectAccessReview)
	if !ok {
		return nil, kapierrors.NewBadRequest(fmt.Sprintf("not a subjectAccessReview: %#v", obj))
	}
	if errs := authorizationvalidation.ValidateSubjectAccessReview(subjectAccessReview); len(errs) > 0 {
		return nil, kapierrors.NewInvalid(authorizationapi.Kind(subjectAccessReview.Kind), "", errs)
	}
	// if a namespace is present on the request, then the namespace on the on the SAR is overwritten.
	// This is to support backwards compatibility.  To have gotten here in this state, it means that
	// the authorizer decided that a user could run an SAR against this namespace
	if namespace := kapi.NamespaceValue(ctx); len(namespace) > 0 {
		subjectAccessReview.Action.Namespace = namespace

	} else if err := r.isAllowed(ctx, subjectAccessReview); err != nil {
		// this check is mutually exclusive to the condition above.  localSAR and localRAR both clear the namespace before delegating their calls
		// We only need to check if the SAR is allowed **again** if the authorizer didn't already approve the request for a legacy call.
		return nil, err
	}

	var userToCheck user.Info
	if (len(subjectAccessReview.User) == 0) && (len(subjectAccessReview.Groups) == 0) {
		// if no user or group was specified, use the info from the context
		ctxUser, exists := kapi.UserFrom(ctx)
		if !exists {
			return nil, kapierrors.NewBadRequest("user missing from context")
		}
		userToCheck = ctxUser

	} else {
		userToCheck = &user.DefaultInfo{
			Name:   subjectAccessReview.User,
			Groups: subjectAccessReview.Groups.List(),
		}

	}

	requestContext := kapi.WithNamespace(kapi.WithUser(ctx, userToCheck), subjectAccessReview.Action.Namespace)
	attributes := authorizer.ToDefaultAuthorizationAttributes(subjectAccessReview.Action)
	allowed, reason, err := r.authorizer.Authorize(requestContext, attributes)
	if err != nil {
		return nil, err
	}

	response := &authorizationapi.SubjectAccessReviewResponse{
		Namespace: subjectAccessReview.Action.Namespace,
		Allowed:   allowed,
		Reason:    reason,
	}

	return response, nil
}

func (c *readOnlyClusterPolicyCache) List(options *kapi.ListOptions) (*authorizationapi.ClusterPolicyList, error) {
	clusterPolicyList := &authorizationapi.ClusterPolicyList{}
	returnedList := c.indexer.List()
	matcher := clusterpolicyregistry.Matcher(api.ListOptionsToSelectors(options))
	for i := range returnedList {
		clusterPolicy, castOK := returnedList[i].(*authorizationapi.ClusterPolicy)
		if !castOK {
			return clusterPolicyList, errors.NewInvalid(authorizationapi.Kind("ClusterPolicy"), "clusterPolicy", kfield.ErrorList{})
		}
		if matches, err := matcher.Matches(clusterPolicy); err == nil && matches {
			clusterPolicyList.Items = append(clusterPolicyList.Items, *clusterPolicy)
		}
	}
	return clusterPolicyList, nil
}

func (c *readOnlyPolicyCache) List(options *kapi.ListOptions, namespace string) (*authorizationapi.PolicyList, error) {
	var returnedList []interface{}
	if namespace == kapi.NamespaceAll {
		returnedList = c.indexer.List()
	} else {
		items, err := c.indexer.Index("namespace", &authorizationapi.Policy{ObjectMeta: kapi.ObjectMeta{Namespace: namespace}})
		returnedList = items
		if err != nil {
			return &authorizationapi.PolicyList{}, errors.NewInvalid(authorizationapi.Kind("PolicyList"), "policyList", kfield.ErrorList{kfield.Invalid(kfield.NewPath("policyList"), nil, err.Error())})
		}
	}
	policyList := &authorizationapi.PolicyList{}
	matcher := policyregistry.Matcher(oapi.ListOptionsToSelectors(options))
	for i := range returnedList {
		policy, castOK := returnedList[i].(*authorizationapi.Policy)
		if !castOK {
			return policyList, errors.NewInvalid(authorizationapi.Kind("PolicyList"), "policyList", kfield.ErrorList{})
		}
		if matches, err := matcher.Matches(policy); err == nil && matches {
			policyList.Items = append(policyList.Items, *policy)
		}
	}
	return policyList, nil
}

func (c *readOnlyClusterPolicyCache) Get(name string) (*authorizationapi.ClusterPolicy, error) {
	keyObj := &authorizationapi.ClusterPolicy{ObjectMeta: kapi.ObjectMeta{Name: name}}
	key, _ := c.keyFunc(keyObj)

	item, exists, getErr := c.indexer.GetByKey(key)
	if getErr != nil {
		return &authorizationapi.ClusterPolicy{}, getErr
	}
	if !exists {
		existsErr := errors.NewNotFound(authorizationapi.Resource("clusterpolicy"), name)
		return &authorizationapi.ClusterPolicy{}, existsErr
	}
	clusterPolicy, castOK := item.(*authorizationapi.ClusterPolicy)
	if !castOK {
		castErr := errors.NewInvalid(authorizationapi.Kind("ClusterPolicy"), name, kfield.ErrorList{})
		return &authorizationapi.ClusterPolicy{}, castErr
	}
	return clusterPolicy, nil
}

func (c *readOnlyPolicyBindingCache) Get(name, namespace string) (*authorizationapi.PolicyBinding, error) {
	keyObj := &authorizationapi.PolicyBinding{ObjectMeta: kapi.ObjectMeta{Namespace: namespace, Name: name}}
	key, _ := c.keyFunc(keyObj)

	item, exists, getErr := c.indexer.GetByKey(key)
	if getErr != nil {
		return &authorizationapi.PolicyBinding{}, getErr
	}
	if !exists {
		existsErr := errors.NewNotFound(authorizationapi.Resource("policybinding"), name)
		return &authorizationapi.PolicyBinding{}, existsErr
	}
	policyBinding, castOK := item.(*authorizationapi.PolicyBinding)
	if !castOK {
		castErr := errors.NewInvalid(authorizationapi.Kind("PolicyBinding"), name, kfield.ErrorList{})
		return &authorizationapi.PolicyBinding{}, castErr
	}
	return policyBinding, nil
}

// NewFactory creates an object that holds common methods across all OpenShift commands
func NewFactory(clientConfig kclientcmd.ClientConfig) *Factory {
	var restMapper meta.MultiRESTMapper
	seenGroups := sets.String{}
	for _, gv := range registered.EnabledVersions() {
		if seenGroups.Has(gv.Group) {
			continue
		}
		seenGroups.Insert(gv.Group)

		groupMeta, err := registered.Group(gv.Group)
		if err != nil {
			continue
		}
		restMapper = meta.MultiRESTMapper(append(restMapper, groupMeta.RESTMapper))
	}
	mapper := ShortcutExpander{RESTMapper: kubectl.ShortcutExpander{RESTMapper: restMapper}}

	clients := &clientCache{
		clients: make(map[string]*client.Client),
		configs: make(map[string]*kclient.Config),
		loader:  clientConfig,
	}

	w := &Factory{
		Factory:               cmdutil.NewFactory(clientConfig),
		OpenShiftClientConfig: clientConfig,
		clients:               clients,
	}

	w.Object = func() (meta.RESTMapper, runtime.ObjectTyper) {
		// Output using whatever version was negotiated in the client cache. The
		// version we decode with may not be the same as what the server requires.
		if cfg, err := clients.ClientConfigForVersion(nil); err == nil {
			cmdApiVersion := unversioned.GroupVersion{}
			if cfg.GroupVersion != nil {
				cmdApiVersion = *cfg.GroupVersion
			}
			return kubectl.OutputVersionMapper{RESTMapper: mapper, OutputVersions: []unversioned.GroupVersion{cmdApiVersion}}, api.Scheme
		}
		return mapper, api.Scheme
	}

	kClientForMapping := w.Factory.ClientForMapping
	w.ClientForMapping = func(mapping *meta.RESTMapping) (resource.RESTClient, error) {
		if latest.OriginKind(mapping.GroupVersionKind) {
			mappingVersion := mapping.GroupVersionKind.GroupVersion()
			client, err := clients.ClientForVersion(&mappingVersion)
			if err != nil {
				return nil, err
			}
			return client.RESTClient, nil
		}
		return kClientForMapping(mapping)
	}

	// Save original Describer function
	kDescriberFunc := w.Factory.Describer
	w.Describer = func(mapping *meta.RESTMapping) (kubectl.Describer, error) {
		if latest.OriginKind(mapping.GroupVersionKind) {
			oClient, kClient, err := w.Clients()
			if err != nil {
				return nil, fmt.Errorf("unable to create client %s: %v", mapping.GroupVersionKind.Kind, err)
			}

			mappingVersion := mapping.GroupVersionKind.GroupVersion()
			cfg, err := clients.ClientConfigForVersion(&mappingVersion)
			if err != nil {
				return nil, fmt.Errorf("unable to load a client %s: %v", mapping.GroupVersionKind.Kind, err)
			}

			describer, ok := describe.DescriberFor(mapping.GroupVersionKind.GroupKind(), oClient, kClient, cfg.Host)
			if !ok {
				return nil, fmt.Errorf("no description has been implemented for %q", mapping.GroupVersionKind.Kind)
			}
			return describer, nil
		}
		return kDescriberFunc(mapping)
	}
	kScalerFunc := w.Factory.Scaler
	w.Scaler = func(mapping *meta.RESTMapping) (kubectl.Scaler, error) {
		oc, kc, err := w.Clients()
		if err != nil {
			return nil, err
		}

		if mapping.GroupVersionKind.GroupKind() == deployapi.Kind("DeploymentConfig") {
			return deployscaler.NewDeploymentConfigScaler(oc, kc), nil
		}
		return kScalerFunc(mapping)
	}
	kReaperFunc := w.Factory.Reaper
	w.Reaper = func(mapping *meta.RESTMapping) (kubectl.Reaper, error) {
		oc, kc, err := w.Clients()
		if err != nil {
			return nil, err
		}

		switch mapping.GroupVersionKind.GroupKind() {
		case deployapi.Kind("DeploymentConfig"):
//.........这里部分代码省略.........

// NewFactory creates an object that holds common methods across all OpenShift commands
func NewFactory(clientConfig kclientcmd.ClientConfig) *Factory {
	restMapper := registered.RESTMapper()

	clients := &clientCache{
		clients: make(map[string]*client.Client),
		configs: make(map[string]*restclient.Config),
		loader:  clientConfig,
	}

	w := &Factory{
		Factory:                cmdutil.NewFactory(clientConfig),
		OpenShiftClientConfig:  clientConfig,
		clients:                clients,
		ImageResolutionOptions: &imageResolutionOptions{},
	}

	w.Object = func(bool) (meta.RESTMapper, runtime.ObjectTyper) {
		defaultMapper := ShortcutExpander{RESTMapper: kubectl.ShortcutExpander{RESTMapper: restMapper}}
		defaultTyper := api.Scheme

		// Output using whatever version was negotiated in the client cache. The
		// version we decode with may not be the same as what the server requires.
		cfg, err := clients.ClientConfigForVersion(nil)
		if err != nil {
			return defaultMapper, defaultTyper
		}

		cmdApiVersion := unversioned.GroupVersion{}
		if cfg.GroupVersion != nil {
			cmdApiVersion = *cfg.GroupVersion
		}

		// at this point we've negotiated and can get the client
		oclient, err := clients.ClientForVersion(nil)
		if err != nil {
			return defaultMapper, defaultTyper
		}

		cacheDir := computeDiscoverCacheDir(filepath.Join(homedir.HomeDir(), ".kube"), cfg.Host)
		cachedDiscoverClient := NewCachedDiscoveryClient(client.NewDiscoveryClient(oclient.RESTClient), cacheDir, time.Duration(10*time.Minute))

		// if we can't find the server version or its too old to have Kind information in the discovery doc, skip the discovery RESTMapper
		// and use our hardcoded levels
		mapper := registered.RESTMapper()
		if serverVersion, err := cachedDiscoverClient.ServerVersion(); err == nil && useDiscoveryRESTMapper(serverVersion.GitVersion) {
			mapper = restmapper.NewDiscoveryRESTMapper(cachedDiscoverClient)
		}
		mapper = NewShortcutExpander(cachedDiscoverClient, kubectl.ShortcutExpander{RESTMapper: mapper})
		return kubectl.OutputVersionMapper{RESTMapper: mapper, OutputVersions: []unversioned.GroupVersion{cmdApiVersion}}, api.Scheme
	}

	w.UnstructuredObject = func() (meta.RESTMapper, runtime.ObjectTyper, error) {
		// load a discovery client from the default config
		cfg, err := clients.ClientConfigForVersion(nil)
		if err != nil {
			return nil, nil, err
		}
		dc, err := discovery.NewDiscoveryClientForConfig(cfg)
		if err != nil {
			return nil, nil, err
		}
		cacheDir := computeDiscoverCacheDir(filepath.Join(homedir.HomeDir(), ".kube"), cfg.Host)
		cachedDiscoverClient := NewCachedDiscoveryClient(client.NewDiscoveryClient(dc.RESTClient), cacheDir, time.Duration(10*time.Minute))

		// enumerate all group resources
		groupResources, err := discovery.GetAPIGroupResources(cachedDiscoverClient)
		if err != nil {
			return nil, nil, err
		}

		// Register unknown APIs as third party for now to make
		// validation happy. TODO perhaps make a dynamic schema
		// validator to avoid this.
		for _, group := range groupResources {
			for _, version := range group.Group.Versions {
				gv := unversioned.GroupVersion{Group: group.Group.Name, Version: version.Version}
				if !registered.IsRegisteredVersion(gv) {
					registered.AddThirdPartyAPIGroupVersions(gv)
				}
			}
		}

		// construct unstructured mapper and typer
		mapper := discovery.NewRESTMapper(groupResources, meta.InterfacesForUnstructured)
		typer := discovery.NewUnstructuredObjectTyper(groupResources)
		return NewShortcutExpander(cachedDiscoverClient, kubectl.ShortcutExpander{RESTMapper: mapper}), typer, nil
	}

	kClientForMapping := w.Factory.ClientForMapping
	w.ClientForMapping = func(mapping *meta.RESTMapping) (resource.RESTClient, error) {
		if latest.OriginKind(mapping.GroupVersionKind) {
			mappingVersion := mapping.GroupVersionKind.GroupVersion()
			client, err := clients.ClientForVersion(&mappingVersion)
			if err != nil {
				return nil, err
			}
			return client.RESTClient, nil
		}
		return kClientForMapping(mapping)
//.........这里部分代码省略.........

func TestAdmission(t *testing.T) {
	var (
		userAlice = userapi.User{
			ObjectMeta: kapi.ObjectMeta{
				Name:   "Alice",
				Labels: map[string]string{"foo": "bar"},
			},
		}
		userAliceRef = kapi.ObjectReference{
			Kind: authorizationapi.UserKind,
			Name: "Alice",
		}

		userBob = userapi.User{
			ObjectMeta: kapi.ObjectMeta{Name: "Bob"},
			Groups:     []string{"group"},
		}
		userBobRef = kapi.ObjectReference{
			Kind: authorizationapi.UserKind,
			Name: "Bob",
		}

		group = userapi.Group{
			ObjectMeta: kapi.ObjectMeta{
				Name:   "group",
				Labels: map[string]string{"baz": "quux"},
			},
			Users: []string{userBobRef.Name},
		}
		groupRef = kapi.ObjectReference{
			Kind: authorizationapi.GroupKind,
			Name: "group",
		}

		serviceaccount = kapi.ServiceAccount{
			ObjectMeta: kapi.ObjectMeta{
				Namespace: "namespace",
				Name:      "serviceaccount",
				Labels:    map[string]string{"xyzzy": "thud"},
			},
		}
		serviceaccountRef = kapi.ObjectReference{
			Kind:      authorizationapi.ServiceAccountKind,
			Namespace: "namespace",
			Name:      "serviceaccount",
		}

		systemuserRef = kapi.ObjectReference{
			Kind: authorizationapi.SystemUserKind,
			Name: "system user",
		}
		systemgroupRef = kapi.ObjectReference{
			Kind: authorizationapi.SystemGroupKind,
			Name: "system group",
		}
	)

	testCases := []struct {
		name        string
		expectedErr string

		object      runtime.Object
		oldObject   runtime.Object
		kind        unversioned.GroupVersionKind
		resource    unversioned.GroupVersionResource
		namespace   string
		subresource string
		objects     []runtime.Object
	}{
		{
			name: "ignore (allow) if subresource is nonempty",
			object: &authorizationapi.RoleBinding{
				ObjectMeta: kapi.ObjectMeta{
					Namespace: "namespace",
					Name:      "rolebinding",
				},
				Subjects: []kapi.ObjectReference{userAliceRef},
			},
			oldObject: &authorizationapi.RoleBinding{
				ObjectMeta: kapi.ObjectMeta{
					Namespace: "namespace",
					Name:      "rolebinding",
				},
				Subjects: []kapi.ObjectReference{},
			},
			kind:        authorizationapi.Kind("RoleBinding").WithVersion("version"),
			resource:    authorizationapi.Resource("rolebindings").WithVersion("version"),
			namespace:   "namespace",
			subresource: "subresource",
			objects: []runtime.Object{
				&kapi.Namespace{
					ObjectMeta: kapi.ObjectMeta{
						Name: "namespace",
					},
				},
			},
		},
		{
			name: "ignore (allow) cluster-scoped rolebinding",
			object: &authorizationapi.RoleBinding{
//.........这里部分代码省略.........

// NewFactory creates an object that holds common methods across all OpenShift commands
func NewFactory(clientConfig kclientcmd.ClientConfig) *Factory {
	restMapper := registered.RESTMapper()

	clients := &clientCache{
		clients: make(map[string]*client.Client),
		configs: make(map[string]*restclient.Config),
		loader:  clientConfig,
	}

	w := &Factory{
		Factory:               cmdutil.NewFactory(clientConfig),
		OpenShiftClientConfig: clientConfig,
		clients:               clients,
	}

	w.Object = func(bool) (meta.RESTMapper, runtime.ObjectTyper) {

		defaultMapper := ShortcutExpander{RESTMapper: kubectl.ShortcutExpander{RESTMapper: restMapper}}
		defaultTyper := api.Scheme

		// Output using whatever version was negotiated in the client cache. The
		// version we decode with may not be the same as what the server requires.
		cfg, err := clients.ClientConfigForVersion(nil)
		if err != nil {
			return defaultMapper, defaultTyper
		}

		cmdApiVersion := unversioned.GroupVersion{}
		if cfg.GroupVersion != nil {
			cmdApiVersion = *cfg.GroupVersion
		}

		// at this point we've negotiated and can get the client
		oclient, err := clients.ClientForVersion(nil)
		if err != nil {
			return defaultMapper, defaultTyper
		}

		cacheDir := computeDiscoverCacheDir(filepath.Join(homedir.HomeDir(), ".kube"), cfg.Host)
		cachedDiscoverClient := NewCachedDiscoveryClient(client.NewDiscoveryClient(oclient.RESTClient), cacheDir, time.Duration(10*time.Minute))

		mapper := restmapper.NewDiscoveryRESTMapper(cachedDiscoverClient)
		mapper = NewShortcutExpander(cachedDiscoverClient, kubectl.ShortcutExpander{RESTMapper: mapper})
		return kubectl.OutputVersionMapper{RESTMapper: mapper, OutputVersions: []unversioned.GroupVersion{cmdApiVersion}}, api.Scheme
	}

	kClientForMapping := w.Factory.ClientForMapping
	w.ClientForMapping = func(mapping *meta.RESTMapping) (resource.RESTClient, error) {
		if latest.OriginKind(mapping.GroupVersionKind) {
			mappingVersion := mapping.GroupVersionKind.GroupVersion()
			client, err := clients.ClientForVersion(&mappingVersion)
			if err != nil {
				return nil, err
			}
			return client.RESTClient, nil
		}
		return kClientForMapping(mapping)
	}

	// Save original Describer function
	kDescriberFunc := w.Factory.Describer
	w.Describer = func(mapping *meta.RESTMapping) (kubectl.Describer, error) {
		if latest.OriginKind(mapping.GroupVersionKind) {
			oClient, kClient, err := w.Clients()
			if err != nil {
				return nil, fmt.Errorf("unable to create client %s: %v", mapping.GroupVersionKind.Kind, err)
			}

			mappingVersion := mapping.GroupVersionKind.GroupVersion()
			cfg, err := clients.ClientConfigForVersion(&mappingVersion)
			if err != nil {
				return nil, fmt.Errorf("unable to load a client %s: %v", mapping.GroupVersionKind.Kind, err)
			}

			describer, ok := describe.DescriberFor(mapping.GroupVersionKind.GroupKind(), oClient, kClient, cfg.Host)
			if !ok {
				return nil, fmt.Errorf("no description has been implemented for %q", mapping.GroupVersionKind.Kind)
			}
			return describer, nil
		}
		return kDescriberFunc(mapping)
	}
	kScalerFunc := w.Factory.Scaler
	w.Scaler = func(mapping *meta.RESTMapping) (kubectl.Scaler, error) {
		oc, kc, err := w.Clients()
		if err != nil {
			return nil, err
		}

		if mapping.GroupVersionKind.GroupKind() == deployapi.Kind("DeploymentConfig") {
			return deployscaler.NewDeploymentConfigScaler(oc, kc), nil
		}
		return kScalerFunc(mapping)
	}
	kReaperFunc := w.Factory.Reaper
	w.Reaper = func(mapping *meta.RESTMapping) (kubectl.Reaper, error) {
		oc, kc, err := w.Clients()
		if err != nil {
			return nil, err
//.........这里部分代码省略.........

// Create registers a given new ResourceAccessReview instance to r.registry.
func (r *REST) Create(ctx kapi.Context, obj runtime.Object) (runtime.Object, error) {
	subjectAccessReview, ok := obj.(*authorizationapi.SubjectAccessReview)
	if !ok {
		return nil, kapierrors.NewBadRequest(fmt.Sprintf("not a subjectAccessReview: %#v", obj))
	}
	if errs := authorizationvalidation.ValidateSubjectAccessReview(subjectAccessReview); len(errs) > 0 {
		return nil, kapierrors.NewInvalid(authorizationapi.Kind(subjectAccessReview.Kind), "", errs)
	}
	// if a namespace is present on the request, then the namespace on the on the SAR is overwritten.
	// This is to support backwards compatibility.  To have gotten here in this state, it means that
	// the authorizer decided that a user could run an SAR against this namespace
	if namespace := kapi.NamespaceValue(ctx); len(namespace) > 0 {
		subjectAccessReview.Action.Namespace = namespace

	} else if err := r.isAllowed(ctx, subjectAccessReview); err != nil {
		// this check is mutually exclusive to the condition above.  localSAR and localRAR both clear the namespace before delegating their calls
		// We only need to check if the SAR is allowed **again** if the authorizer didn't already approve the request for a legacy call.
		return nil, err
	}

	var userToCheck *user.DefaultInfo
	if (len(subjectAccessReview.User) == 0) && (len(subjectAccessReview.Groups) == 0) {
		// if no user or group was specified, use the info from the context
		ctxUser, exists := kapi.UserFrom(ctx)
		if !exists {
			return nil, kapierrors.NewBadRequest("user missing from context")
		}
		// make a copy, we don't want to risk changing the original
		newExtra := map[string][]string{}
		for k, v := range ctxUser.GetExtra() {
			if v == nil {
				newExtra[k] = nil
				continue
			}
			newSlice := make([]string, len(v), len(v))
			copy(newSlice, v)
			newExtra[k] = newSlice
		}

		userToCheck = &user.DefaultInfo{
			Name:   ctxUser.GetName(),
			Groups: ctxUser.GetGroups(),
			UID:    ctxUser.GetUID(),
			Extra:  newExtra,
		}

	} else {
		userToCheck = &user.DefaultInfo{
			Name:   subjectAccessReview.User,
			Groups: subjectAccessReview.Groups.List(),
			Extra:  map[string][]string{},
		}
	}

	switch {
	case subjectAccessReview.Scopes == nil:
		// leave the scopes alone.  on a self-sar, this means "use incoming request", on regular-sar it means, "use no scope restrictions"
	case len(subjectAccessReview.Scopes) == 0:
		// this always means "use no scope restrictions", so delete them
		delete(userToCheck.Extra, authorizationapi.ScopesKey)

	case len(subjectAccessReview.Scopes) > 0:
		// this always means, "use these scope restrictions", so force the value
		userToCheck.Extra[authorizationapi.ScopesKey] = subjectAccessReview.Scopes
	}

	requestContext := kapi.WithNamespace(kapi.WithUser(ctx, userToCheck), subjectAccessReview.Action.Namespace)
	attributes := authorizer.ToDefaultAuthorizationAttributes(subjectAccessReview.Action)
	allowed, reason, err := r.authorizer.Authorize(requestContext, attributes)
	if err != nil {
		return nil, err
	}

	response := &authorizationapi.SubjectAccessReviewResponse{
		Namespace: subjectAccessReview.Action.Namespace,
		Allowed:   allowed,
		Reason:    reason,
	}

	return response, nil
}