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gcp.go
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gcp.go
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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 (
"bytes"
"encoding/json"
"fmt"
"net/http"
"os/exec"
"strings"
"sync"
"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"
"k8s.io/kubernetes/pkg/util/jsonpath"
"k8s.io/kubernetes/pkg/util/yaml"
)
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) {
cmd, useCmd := gcpConfig["cmd-path"]
var ts oauth2.TokenSource
var err error
if useCmd {
ts, err = newCmdTokenSource(cmd, gcpConfig["token-key"], gcpConfig["expiry-key"], gcpConfig["time-fmt"])
} else {
ts, err = google.DefaultTokenSource(context.Background(), "https://www.googleapis.com/auth/cloud-platform")
}
if err != nil {
return nil, err
}
cts, err := newCachedTokenSource(gcpConfig["access-token"], gcpConfig["expiry"], persister, ts, gcpConfig)
if err != nil {
return nil, err
}
return &gcpAuthProvider{cts, 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 {
lk sync.Mutex
source oauth2.TokenSource
accessToken string
expiry time.Time
persister restclient.AuthProviderConfigPersister
cache map[string]string
}
func newCachedTokenSource(accessToken, expiry string, persister restclient.AuthProviderConfigPersister, ts oauth2.TokenSource, cache map[string]string) (*cachedTokenSource, error) {
var expiryTime time.Time
if parsedTime, err := time.Parse(time.RFC3339Nano, expiry); err == nil {
expiryTime = parsedTime
}
if cache == nil {
cache = make(map[string]string)
}
return &cachedTokenSource{
source: ts,
accessToken: accessToken,
expiry: expiryTime,
persister: persister,
cache: cache,
}, nil
}
func (t *cachedTokenSource) Token() (*oauth2.Token, error) {
tok := t.cachedToken()
if tok.Valid() && !tok.Expiry.IsZero() {
return tok, nil
}
tok, err := t.source.Token()
if err != nil {
return nil, err
}
cache := t.update(tok)
if t.persister != nil {
if err := t.persister.Persist(cache); err != nil {
glog.V(4).Infof("Failed to persist token: %v", err)
}
}
return tok, nil
}
func (t *cachedTokenSource) cachedToken() *oauth2.Token {
t.lk.Lock()
defer t.lk.Unlock()
return &oauth2.Token{
AccessToken: t.accessToken,
TokenType: "Bearer",
Expiry: t.expiry,
}
}
func (t *cachedTokenSource) update(tok *oauth2.Token) map[string]string {
t.lk.Lock()
defer t.lk.Unlock()
t.accessToken = tok.AccessToken
t.expiry = tok.Expiry
ret := map[string]string{}
for k, v := range t.cache {
ret[k] = v
}
ret["access-token"] = t.accessToken
ret["expiry"] = t.expiry.Format(time.RFC3339Nano)
return ret
}
type commandTokenSource struct {
cmd string
args []string
tokenKey string
expiryKey string
timeFmt string
}
func newCmdTokenSource(cmd, tokenKey, expiryKey, timeFmt string) (*commandTokenSource, error) {
if len(timeFmt) == 0 {
timeFmt = time.RFC3339Nano
}
if len(tokenKey) == 0 {
tokenKey = "{.access_token}"
}
if len(expiryKey) == 0 {
expiryKey = "{.token_expiry}"
}
fields := strings.Fields(cmd)
if len(fields) == 0 {
return nil, fmt.Errorf("missing access token cmd")
}
return &commandTokenSource{
cmd: fields[0],
args: fields[1:],
tokenKey: tokenKey,
expiryKey: expiryKey,
timeFmt: timeFmt,
}, nil
}
func (c *commandTokenSource) Token() (*oauth2.Token, error) {
fullCmd := fmt.Sprintf("%s %s", c.cmd, strings.Join(c.args, " "))
cmd := exec.Command(c.cmd, c.args...)
output, err := cmd.Output()
if err != nil {
return nil, fmt.Errorf("error executing access token command %q: %v", fullCmd, err)
}
token, err := c.parseTokenCmdOutput(output)
if err != nil {
return nil, fmt.Errorf("error parsing output for access token command %q: %v", fullCmd, err)
}
return token, nil
}
func (c *commandTokenSource) parseTokenCmdOutput(output []byte) (*oauth2.Token, error) {
output, err := yaml.ToJSON(output)
if err != nil {
return nil, err
}
var data interface{}
if err := json.Unmarshal(output, &data); err != nil {
return nil, err
}
accessToken, err := parseJSONPath(data, "token-key", c.tokenKey)
if err != nil {
return nil, fmt.Errorf("error parsing token-key %q: %v", c.tokenKey, err)
}
expiryStr, err := parseJSONPath(data, "expiry-key", c.expiryKey)
if err != nil {
return nil, fmt.Errorf("error parsing expiry-key %q: %v", c.expiryKey, err)
}
var expiry time.Time
if t, err := time.Parse(c.timeFmt, expiryStr); err != nil {
glog.V(4).Infof("Failed to parse token expiry from %s (fmt=%s): %v", expiryStr, c.timeFmt, err)
} else {
expiry = t
}
return &oauth2.Token{
AccessToken: accessToken,
TokenType: "Bearer",
Expiry: expiry,
}, nil
}
func parseJSONPath(input interface{}, name, template string) (string, error) {
j := jsonpath.New(name)
buf := new(bytes.Buffer)
if err := j.Parse(template); err != nil {
return "", err
}
if err := j.Execute(buf, input); err != nil {
return "", err
}
return buf.String(), nil
}