/
who_can.go
185 lines (151 loc) · 5.35 KB
/
who_can.go
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package policy
import (
"bytes"
"errors"
"fmt"
"strings"
"github.com/spf13/cobra"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/cli-runtime/pkg/genericclioptions"
kcmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
"k8s.io/kubernetes/pkg/kubectl/scheme"
"k8s.io/kubernetes/pkg/printers"
authorizationv1 "github.com/openshift/api/authorization/v1"
authorizationv1typedclient "github.com/openshift/client-go/authorization/clientset/versioned/typed/authorization/v1"
)
const WhoCanRecommendedName = "who-can"
type WhoCanOptions struct {
PrintFlags *genericclioptions.PrintFlags
ToPrinter func(string) (printers.ResourcePrinter, error)
allNamespaces bool
bindingNamespace string
client authorizationv1typedclient.AuthorizationV1Interface
verb string
resource schema.GroupVersionResource
resourceName string
genericclioptions.IOStreams
}
func NewWhoCanOptions(streams genericclioptions.IOStreams) *WhoCanOptions {
return &WhoCanOptions{
PrintFlags: genericclioptions.NewPrintFlags("").WithTypeSetter(scheme.Scheme),
IOStreams: streams,
}
}
// NewCmdWhoCan implements the OpenShift cli who-can command
func NewCmdWhoCan(name, fullName string, f kcmdutil.Factory, streams genericclioptions.IOStreams) *cobra.Command {
o := NewWhoCanOptions(streams)
cmd := &cobra.Command{
Use: name + " VERB RESOURCE [NAME]",
Short: "List who can perform the specified action on a resource",
Long: "List who can perform the specified action on a resource",
Run: func(cmd *cobra.Command, args []string) {
kcmdutil.CheckErr(o.complete(f, cmd, args))
kcmdutil.CheckErr(o.run())
},
}
cmd.Flags().BoolVarP(&o.allNamespaces, "all-namespaces", "A", o.allNamespaces, "If true, list who can perform the specified action in all namespaces.")
o.PrintFlags.AddFlags(cmd)
return cmd
}
func (o *WhoCanOptions) complete(f kcmdutil.Factory, cmd *cobra.Command, args []string) error {
mapper, err := f.ToRESTMapper()
if err != nil {
return err
}
switch len(args) {
case 3:
o.resourceName = args[2]
fallthrough
case 2:
o.verb = args[0]
o.resource = ResourceFor(mapper, args[1])
default:
return errors.New("you must specify two or three arguments: verb, resource, and optional resourceName")
}
clientConfig, err := f.ToRESTConfig()
if err != nil {
return err
}
o.client, err = authorizationv1typedclient.NewForConfig(clientConfig)
if err != nil {
return err
}
o.bindingNamespace, _, err = f.ToRawKubeConfigLoader().Namespace()
if err != nil {
return err
}
o.ToPrinter = func(operation string) (printers.ResourcePrinter, error) {
o.PrintFlags.NamePrintFlags.Operation = operation
return o.PrintFlags.ToPrinter()
}
return nil
}
func ResourceFor(mapper meta.RESTMapper, resourceArg string) schema.GroupVersionResource {
fullySpecifiedGVR, groupResource := schema.ParseResourceArg(strings.ToLower(resourceArg))
gvr := schema.GroupVersionResource{}
if fullySpecifiedGVR != nil {
gvr, _ = mapper.ResourceFor(*fullySpecifiedGVR)
}
if gvr.Empty() {
var err error
gvr, err = mapper.ResourceFor(groupResource.WithVersion(""))
if err != nil {
return schema.GroupVersionResource{Resource: resourceArg}
}
}
return gvr
}
func (o *WhoCanOptions) run() error {
authorizationAttributes := authorizationv1.Action{
Verb: o.verb,
Group: o.resource.Group,
Resource: o.resource.Resource,
ResourceName: o.resourceName,
}
resourceAccessReviewResponse := &authorizationv1.ResourceAccessReviewResponse{}
var err error
if o.allNamespaces {
resourceAccessReviewResponse, err = o.client.ResourceAccessReviews().Create(&authorizationv1.ResourceAccessReview{Action: authorizationAttributes})
} else {
resourceAccessReviewResponse, err = o.client.LocalResourceAccessReviews(o.bindingNamespace).Create(&authorizationv1.LocalResourceAccessReview{Action: authorizationAttributes})
}
if err != nil {
return err
}
message := bytes.NewBuffer([]byte{})
fmt.Fprintln(message)
if resourceAccessReviewResponse.Namespace == metav1.NamespaceAll {
fmt.Fprintf(message, "\n%s\n", "Namespace: <all>")
} else {
fmt.Fprintf(message, "\nNamespace: %s\n", resourceAccessReviewResponse.Namespace)
}
resourceDisplay := o.resource.Resource
if len(o.resource.Group) > 0 {
resourceDisplay = resourceDisplay + "." + o.resource.Group
}
fmt.Fprintf(message, "Verb: %s\n", o.verb)
fmt.Fprintf(message, "Resource: %s\n", resourceDisplay)
if len(resourceAccessReviewResponse.UsersSlice) == 0 {
fmt.Fprintf(message, "\n%s\n", "Users: none")
} else {
userSlice := sets.NewString(resourceAccessReviewResponse.UsersSlice...)
fmt.Fprintf(message, "\nUsers: %s\n", strings.Join(userSlice.List(), "\n "))
}
if len(resourceAccessReviewResponse.GroupsSlice) == 0 {
fmt.Fprintf(message, "\n%s\n", "Groups: none")
} else {
groupSlice := sets.NewString(resourceAccessReviewResponse.GroupsSlice...)
fmt.Fprintf(message, "Groups: %s\n", strings.Join(groupSlice.List(), "\n "))
}
if len(resourceAccessReviewResponse.EvaluationError) != 0 {
fmt.Fprintf(message, "\nError during evaluation, results may not be complete: %s\n", resourceAccessReviewResponse.EvaluationError)
}
p, err := o.ToPrinter(message.String())
if err != nil {
return err
}
return p.PrintObj(resourceAccessReviewResponse, o.Out)
}