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create_role.go
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/
create_role.go
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/*
Copyright 2017 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 cmd
import (
"fmt"
"io"
"strings"
"github.com/spf13/cobra"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/kubernetes/pkg/apis/rbac"
internalversionrbac "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/rbac/internalversion"
"k8s.io/kubernetes/pkg/kubectl/cmd/templates"
cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
)
var (
roleLong = templates.LongDesc(`
Create a role with single rule.`)
roleExample = templates.Examples(`
# Create a Role named "pod-reader" that allows user to perform "get", "watch" and "list" on pods
kubectl create role pod-reader --verb=get --verb=list --verb=watch --resource=pods
# Create a Role named "pod-reader" with ResourceName specified
kubectl create role pod-reader --verb=get --verg=list --verb=watch --resource=pods --resource-name=readablepod`)
// Valid resource verb list for validation.
validResourceVerbs = []string{"*", "get", "delete", "list", "create", "update", "patch", "watch", "proxy", "redirect", "deletecollection", "use"}
)
type CreateRoleOptions struct {
Name string
Verbs []string
Resources []schema.GroupVersionResource
ResourceNames []string
DryRun bool
OutputFormat string
Namespace string
Client internalversionrbac.RbacInterface
Mapper meta.RESTMapper
Out io.Writer
PrintObject func(obj runtime.Object) error
}
// Role is a command to ease creating Roles.
func NewCmdCreateRole(f cmdutil.Factory, cmdOut io.Writer) *cobra.Command {
c := &CreateRoleOptions{
Out: cmdOut,
}
cmd := &cobra.Command{
Use: "role NAME --verb=verb --resource=resource.group [--resource-name=resourcename] [--dry-run]",
Short: roleLong,
Long: roleLong,
Example: roleExample,
Run: func(cmd *cobra.Command, args []string) {
cmdutil.CheckErr(c.Complete(f, cmd, args))
cmdutil.CheckErr(c.Validate())
cmdutil.CheckErr(c.RunCreateRole())
},
}
cmdutil.AddApplyAnnotationFlags(cmd)
cmdutil.AddValidateFlags(cmd)
cmdutil.AddPrinterFlags(cmd)
cmdutil.AddDryRunFlag(cmd)
cmd.Flags().StringSliceVar(&c.Verbs, "verb", []string{}, "verb that applies to the resources contained in the rule")
cmd.Flags().StringSlice("resource", []string{}, "resource that the rule applies to")
cmd.Flags().StringSliceVar(&c.ResourceNames, "resource-name", []string{}, "resource in the white list that the rule applies to")
return cmd
}
func (c *CreateRoleOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
name, err := NameFromCommandArgs(cmd, args)
if err != nil {
return err
}
c.Name = name
// Remove duplicate verbs.
verbs := []string{}
for _, v := range c.Verbs {
// VerbAll respresents all kinds of verbs.
if v == "*" {
verbs = []string{"*"}
break
}
if !arrayContains(verbs, v) {
verbs = append(verbs, v)
}
}
c.Verbs = verbs
// Support resource.group pattern. If no API Group specified, use "" as core API Group.
// e.g. --resource=pods,deployments.extensions
resources := cmdutil.GetFlagStringSlice(cmd, "resource")
for _, r := range resources {
sections := strings.Split(r, ".")
if len(sections) == 1 {
c.Resources = append(c.Resources, schema.GroupVersionResource{Resource: r})
} else {
c.Resources = append(c.Resources, schema.GroupVersionResource{Resource: sections[0], Group: strings.Join(sections[1:], ".")})
}
}
// Remove duplicate resource names.
resourceNames := []string{}
for _, n := range c.ResourceNames {
if !arrayContains(resourceNames, n) {
resourceNames = append(resourceNames, n)
}
}
c.ResourceNames = resourceNames
// Complete other options for Run.
c.Mapper, _ = f.Object()
c.DryRun = cmdutil.GetDryRunFlag(cmd)
c.OutputFormat = cmdutil.GetFlagString(cmd, "output")
c.Namespace, _, err = f.DefaultNamespace()
if err != nil {
return err
}
c.PrintObject = func(obj runtime.Object) error {
return f.PrintObject(cmd, c.Mapper, obj, c.Out)
}
clientSet, err := f.ClientSet()
if err != nil {
return err
}
c.Client = clientSet.Rbac()
return nil
}
func (c *CreateRoleOptions) Validate() error {
if c.Name == "" {
return fmt.Errorf("name must be specified")
}
// validate verbs.
if len(c.Verbs) == 0 {
return fmt.Errorf("at least one verb must be specified")
}
for _, v := range c.Verbs {
if !arrayContains(validResourceVerbs, v) {
return fmt.Errorf("invalid verb: '%s'", v)
}
}
// validate resources.
if len(c.Resources) == 0 {
return fmt.Errorf("at least one resource must be specified")
}
for _, r := range c.Resources {
_, err := c.Mapper.ResourceFor(r)
if err != nil {
return err
}
}
// validate resource names, can not apply resource names to multiple resources.
if len(c.ResourceNames) > 0 && len(c.Resources) > 1 {
return fmt.Errorf("resource name(s) can not be applied to multiple resources")
}
return nil
}
func (c *CreateRoleOptions) RunCreateRole() error {
role := &rbac.Role{}
role.Name = c.Name
rules, err := generateResourcePolicyRules(c.Mapper, c.Verbs, c.Resources, c.ResourceNames)
if err != nil {
return err
}
role.Rules = rules
// Create role.
if !c.DryRun {
_, err = c.Client.Roles(c.Namespace).Create(role)
if err != nil {
return err
}
}
if useShortOutput := c.OutputFormat == "name"; useShortOutput || len(c.OutputFormat) == 0 {
cmdutil.PrintSuccess(c.Mapper, useShortOutput, c.Out, "roles", c.Name, c.DryRun, "created")
return nil
}
return c.PrintObject(role)
}
func arrayContains(s []string, e string) bool {
for _, a := range s {
if a == e {
return true
}
}
return false
}
func generateResourcePolicyRules(mapper meta.RESTMapper, verbs []string, resources []schema.GroupVersionResource, resourceNames []string) ([]rbac.PolicyRule, error) {
// groupResourceMapping is a apigroup-resource map. The key of this map is api group, while the value
// is a string array of resources under this api group.
// E.g. groupResourceMapping = {"extensions": ["replicasets", "deployments"], "batch":["jobs"]}
groupResourceMapping := map[string][]string{}
// This loop does the following work:
// 1. Constructs groupResourceMapping based on input resources.
// 2. Prevents pointing to non-existent resources.
// 3. Transfers resource short name to long name. E.g. rs.extensions is transferred to replicasets.extensions
for _, r := range resources {
resource, err := mapper.ResourceFor(r)
if err != nil {
return []rbac.PolicyRule{}, err
}
if !arrayContains(groupResourceMapping[resource.Group], resource.Resource) {
groupResourceMapping[resource.Group] = append(groupResourceMapping[resource.Group], resource.Resource)
}
}
// Create separate rule for each of the api group.
rules := []rbac.PolicyRule{}
for _, g := range sets.StringKeySet(groupResourceMapping).List() {
rule := rbac.PolicyRule{}
rule.Verbs = verbs
rule.Resources = groupResourceMapping[g]
rule.APIGroups = []string{g}
rule.ResourceNames = resourceNames
rules = append(rules, rule)
}
return rules, nil
}