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/*
Copyright 2016 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 gcp
import (
"net/http"
"time"
"github.com/golang/glog"
"golang.org/x/net/context"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
"k8s.io/kubernetes/pkg/client/restclient"
)
func init() {
if err := restclient.RegisterAuthProviderPlugin("gcp", newGCPAuthProvider); err != nil {
glog.Fatalf("Failed to register gcp auth plugin: %v", err)
}
}
type gcpAuthProvider struct {
tokenSource oauth2.TokenSource
persister restclient.AuthProviderConfigPersister
}
func newGCPAuthProvider(_ string, gcpConfig map[string]string, persister restclient.AuthProviderConfigPersister) (restclient.AuthProvider, error) {
ts, err := newCachedTokenSource(gcpConfig["access-token"], gcpConfig["expiry"], persister)
if err != nil {
return nil, err
}
return &gcpAuthProvider{ts, persister}, nil
}
func (g *gcpAuthProvider) WrapTransport(rt http.RoundTripper) http.RoundTripper {
return &oauth2.Transport{
Source: g.tokenSource,
Base: rt,
}
}
func (g *gcpAuthProvider) Login() error { return nil }
type cachedTokenSource struct {
source oauth2.TokenSource
accessToken string
expiry time.Time
persister restclient.AuthProviderConfigPersister
}
func newCachedTokenSource(accessToken, expiry string, persister restclient.AuthProviderConfigPersister) (*cachedTokenSource, error) {
var expiryTime time.Time
if parsedTime, err := time.Parse(time.RFC3339Nano, expiry); err == nil {
expiryTime = parsedTime
}
ts, err := google.DefaultTokenSource(context.Background(), "https://www.googleapis.com/auth/cloud-platform")
if err != nil {
return nil, err
}
return &cachedTokenSource{
source: ts,
accessToken: accessToken,
expiry: expiryTime,
persister: persister,
}, nil
}
func (t *cachedTokenSource) Token() (*oauth2.Token, error) {
tok := &oauth2.Token{
AccessToken: t.accessToken,
TokenType: "Bearer",
Expiry: t.expiry,
}
if tok.Valid() && !tok.Expiry.IsZero() {
return tok, nil
}
tok, err := t.source.Token()
if err != nil {
return nil, err
}
if t.persister != nil {
cached := map[string]string{
"access-token": tok.AccessToken,
"expiry": tok.Expiry.Format(time.RFC3339Nano),
}
if err := t.persister.Persist(cached); err != nil {
glog.V(4).Infof("Failed to persist token: %v", err)
}
}
return tok, nil
}
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