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provider.go
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/
provider.go
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// Copyright 2022 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package kubernetes
import (
"context"
"encoding/json"
"fmt"
"net"
"os"
"strings"
"github.com/juju/errors"
"github.com/juju/loggo"
"github.com/juju/names/v5"
"github.com/juju/version/v2"
"github.com/juju/juju/caas"
k8scloud "github.com/juju/juju/caas/kubernetes/cloud"
"github.com/juju/juju/cloud"
"github.com/juju/juju/environs"
"github.com/juju/juju/environs/cloudspec"
"github.com/juju/juju/environs/config"
"github.com/juju/juju/secrets/provider"
"github.com/juju/juju/state"
)
var logger = loggo.GetLogger("juju.secrets.provider.kubernetes")
const (
// BackendType is the type of the Kubernetes secrets backend.
BackendType = "kubernetes"
)
// NewProvider returns a Kubernetes secrets provider.
func NewProvider() provider.SecretBackendProvider {
return k8sProvider{}
}
type k8sProvider struct {
}
func (p k8sProvider) Type() string {
return BackendType
}
// Initialise is not used.
func (p k8sProvider) Initialise(*provider.ModelBackendConfig) error {
return nil
}
// CleanupModel is not used.
func (p k8sProvider) CleanupModel(*provider.ModelBackendConfig) error {
return nil
}
func (p k8sProvider) getBroker(cfg *provider.ModelBackendConfig) (Broker, cloudspec.CloudSpec, error) {
cloudSpec, err := p.configToCloudSpec(&cfg.BackendConfig)
if err != nil {
return nil, cloudspec.CloudSpec{}, errors.Trace(err)
}
envCfg, err := config.New(config.UseDefaults, map[string]interface{}{
config.NameKey: cfg.ModelName,
config.UUIDKey: cfg.ModelUUID,
config.TypeKey: state.ModelTypeCAAS,
})
if err != nil {
return nil, cloudspec.CloudSpec{}, errors.Trace(err)
}
broker, err := NewCaas(context.TODO(), environs.OpenParams{
ControllerUUID: cfg.ControllerUUID,
Cloud: cloudSpec,
Config: envCfg,
})
return broker, cloudSpec, errors.Trace(err)
}
// CleanupSecrets removes rules of the role associated with the removed secrets.
func (p k8sProvider) CleanupSecrets(cfg *provider.ModelBackendConfig, tag names.Tag, removed provider.SecretRevisions) error {
if tag == nil {
// This should never happen.
// Because this method is used for uniter facade only.
return errors.New("empty tag")
}
if len(removed) == 0 {
return nil
}
broker, _, err := p.getBroker(cfg)
if err != nil {
return errors.Trace(err)
}
_, err = broker.EnsureSecretAccessToken(tag, nil, nil, removed.RevisionIDs())
return errors.Trace(err)
}
func cloudSpecToBackendConfig(spec cloudspec.CloudSpec) (*provider.BackendConfig, error) {
cred, err := json.Marshal(spec.Credential)
if err != nil {
return nil, errors.Trace(err)
}
return &provider.BackendConfig{
BackendType: BackendType,
Config: map[string]interface{}{
"endpoint": spec.Endpoint,
"ca-certs": spec.CACertificates,
"is-controller-cloud": spec.IsControllerCloud,
"credential": string(cred),
},
}, nil
}
// BuiltInConfig returns the config needed to create a k8s secrets backend
// using the same namespace as the specified model.
func BuiltInConfig(cloudSpec cloudspec.CloudSpec) (*provider.BackendConfig, error) {
return cloudSpecToBackendConfig(cloudSpec)
}
// BuiltInName returns the backend name for the k8s in-model backend.
func BuiltInName(modelName string) string {
return modelName + "-local"
}
// IsBuiltInName returns true of the backend name is the built-in one.
func IsBuiltInName(backendName string) bool {
return strings.HasSuffix(backendName, "-local")
}
// RestrictedConfig returns the config needed to create a
// secrets backend client restricted to manage the specified
// owned secrets and read shared secrets for the given entity tag.
func (p k8sProvider) RestrictedConfig(
adminCfg *provider.ModelBackendConfig, sameController, forDrain bool, consumer names.Tag, owned provider.SecretRevisions, read provider.SecretRevisions,
) (*provider.BackendConfig, error) {
logger.Tracef("getting k8s backend config for %q, owned %v, read %v", consumer, owned, read)
if consumer == nil {
return &adminCfg.BackendConfig, nil
}
broker, cloudSpec, err := p.getBroker(adminCfg)
if err != nil {
return nil, errors.Trace(err)
}
token, err := broker.EnsureSecretAccessToken(consumer, owned.RevisionIDs(), read.RevisionIDs(), nil)
if err != nil {
return nil, errors.Trace(err)
}
cred, err := k8scloud.UpdateCredentialWithToken(*cloudSpec.Credential, token)
if err != nil {
return nil, errors.Trace(err)
}
cloudSpec.Credential = &cred
if sameController && cloudSpec.IsControllerCloud {
// The cloudspec used for controller has a fake endpoint (address and port)
// because we ignore the endpoint and load the in-cluster credential instead.
// So we have to clean up the endpoint here for uniter to use.
host, port := os.Getenv("KUBERNETES_SERVICE_HOST"), os.Getenv("KUBERNETES_SERVICE_PORT")
if len(host) != 0 && len(port) != 0 {
cloudSpec.Endpoint = "https://" + net.JoinHostPort(host, port)
logger.Tracef("patching endpoint to %q", cloudSpec.Endpoint)
cloudSpec.IsControllerCloud = false
}
} else {
cloudSpec.IsControllerCloud = false
}
return cloudSpecToBackendConfig(cloudSpec)
}
type Broker interface {
caas.SecretsBackend
caas.SecretsProvider
Version() (ver *version.Number, err error)
}
// NewCaas is patched for testing.
var NewCaas = newCaas
func newCaas(ctx context.Context, args environs.OpenParams) (Broker, error) {
return caas.New(ctx, args)
}
// NewBackend returns a k8s backed secrets backend.
func (p k8sProvider) NewBackend(cfg *provider.ModelBackendConfig) (provider.SecretsBackend, error) {
broker, _, err := p.getBroker(cfg)
if err != nil {
return nil, errors.Annotate(err, "getting cluster client")
}
return &k8sBackend{broker: broker, pinger: func() error {
_, err := broker.Version()
if err == nil {
return err
}
return errors.Annotate(err, "backend not reachable")
}}, nil
}
func (p k8sProvider) configToCloudSpec(cfg *provider.BackendConfig) (cloudspec.CloudSpec, error) {
cloudSpec := cloudspec.CloudSpec{
Type: "kubernetes",
Name: "secret-access",
Endpoint: cfg.Config["endpoint"].(string),
IsControllerCloud: cfg.Config["is-controller-cloud"].(bool),
}
var ok bool
cloudSpec.CACertificates, ok = cfg.Config["ca-certs"].([]string)
if !ok {
certs := cfg.Config["ca-certs"].([]interface{})
cloudSpec.CACertificates = make([]string, len(certs))
for i, cert := range certs {
cloudSpec.CACertificates[i] = fmt.Sprintf("%s", cert)
}
}
var cred cloud.Credential
err := json.Unmarshal([]byte(cfg.Config["credential"].(string)), &cred)
if err != nil {
return cloudspec.CloudSpec{}, errors.Trace(err)
}
cloudSpec.Credential = &cred
return cloudSpec, nil
}