Revert "GCE tokens behavior to new format"

pkg/cloudprovider/providers/gce/gce.go

@@ -61,7 +61,6 @@ type GCECloud struct {
 type Config struct {
 	Global struct {
 		TokenURL    string `gcfg:"token-url"`
-		TokenBody   string `gcfg:"token-body"`
 		ProjectID   string `gcfg:"project-id"`
 		NetworkName string `gcfg:"network-name"`
 	}
@@ -160,7 +159,7 @@ func newGCECloud(config io.Reader) (*GCECloud, error) {
 			}
 		}
 		if cfg.Global.TokenURL != "" {
-			tokenSource = newAltTokenSource(cfg.Global.TokenURL, cfg.Global.TokenBody)
+			tokenSource = newAltTokenSource(cfg.Global.TokenURL)
 		}
 	}
 	client := oauth2.NewClient(oauth2.NoContext, tokenSource)

pkg/cloudprovider/providers/gce/token_source.go

@@ -19,7 +19,6 @@ package gce_cloud
 import (
 	"encoding/json"
 	"net/http"
-	"strings"
 	"time"
 
 	"k8s.io/kubernetes/pkg/util"
@@ -60,7 +59,6 @@ func init() {
 type altTokenSource struct {
 	oauthClient *http.Client
 	tokenURL    string
-	tokenBody   string
 	throttle    util.RateLimiter
 }
 
@@ -75,7 +73,7 @@ func (a *altTokenSource) Token() (*oauth2.Token, error) {
 }
 
 func (a *altTokenSource) token() (*oauth2.Token, error) {
-	req, err := http.NewRequest("POST", a.tokenURL, strings.NewReader(a.tokenBody))
+	req, err := http.NewRequest("GET", a.tokenURL, nil)
 	if err != nil {
 		return nil, err
 	}
@@ -88,24 +86,23 @@ func (a *altTokenSource) token() (*oauth2.Token, error) {
 		return nil, err
 	}
 	var tok struct {
-		AccessToken string    `json:"accessToken"`
-		ExpireTime  time.Time `json:"expireTime"`
+		AccessToken       string `json:"accessToken"`
+		ExpiryTimeSeconds int64  `json:"expiryTimeSeconds,string"`
 	}
 	if err := json.NewDecoder(res.Body).Decode(&tok); err != nil {
 		return nil, err
 	}
 	return &oauth2.Token{
 		AccessToken: tok.AccessToken,
-		Expiry:      tok.ExpireTime,
+		Expiry:      time.Unix(tok.ExpiryTimeSeconds, 0),
 	}, nil
 }
 
-func newAltTokenSource(tokenURL, tokenBody string) oauth2.TokenSource {
+func newAltTokenSource(tokenURL string) oauth2.TokenSource {
 	client := oauth2.NewClient(oauth2.NoContext, google.ComputeTokenSource(""))
 	a := &altTokenSource{
 		oauthClient: client,
 		tokenURL:    tokenURL,
-		tokenBody:   tokenBody,
 		throttle:    util.NewTokenBucketRateLimiter(tokenURLQPS, tokenURLBurst),
 	}
 	return oauth2.ReuseTokenSource(nil, a)