go.mod: update golang.org/x dependencies

Update golang.org/x dependencies to their latest tagged versions.

Change-Id: I2fb95ca59417e20377bc315094221fa7165128c8
Reviewed-on: https://go-review.googlesource.com/c/oauth2/+/525675
Reviewed-by: Heschi Kreinick <heschi@google.com>
Run-TryBot: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Gopher Robot <gobot@golang.org>

clientcredentials/clientcredentials.go

@@ -47,6 +47,10 @@ type Config struct {
 	// client ID & client secret sent. The zero value means to
 	// auto-detect.
 	AuthStyle oauth2.AuthStyle
+
+	// authStyleCache caches which auth style to use when Endpoint.AuthStyle is
+	// the zero value (AuthStyleAutoDetect).
+	authStyleCache internal.LazyAuthStyleCache
 }
 
 // Token uses client credentials to retrieve a token.
@@ -103,7 +107,7 @@ func (c *tokenSource) Token() (*oauth2.Token, error) {
 		v[k] = p
 	}
 
-	tk, err := internal.RetrieveToken(c.ctx, c.conf.ClientID, c.conf.ClientSecret, c.conf.TokenURL, v, internal.AuthStyle(c.conf.AuthStyle))
+	tk, err := internal.RetrieveToken(c.ctx, c.conf.ClientID, c.conf.ClientSecret, c.conf.TokenURL, v, internal.AuthStyle(c.conf.AuthStyle), c.conf.authStyleCache.Get())
 	if err != nil {
 		if rErr, ok := err.(*internal.RetrieveError); ok {
 			return nil, (*oauth2.RetrieveError)(rErr)

clientcredentials/clientcredentials_test.go

@@ -12,8 +12,6 @@ import (
 	"net/http/httptest"
 	"net/url"
 	"testing"
-
-	"golang.org/x/oauth2/internal"
 )
 
 func newConf(serverURL string) *Config {
@@ -114,7 +112,6 @@ func TestTokenRequest(t *testing.T) {
 }
 
 func TestTokenRefreshRequest(t *testing.T) {
-	internal.ResetAuthCache()
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if r.URL.String() == "/somethingelse" {
 			return

go.mod

@@ -1,6 +1,6 @@
 module golang.org/x/oauth2
 
-go 1.17
+go 1.18
 
 require (
 	cloud.google.com/go/compute/metadata v0.2.3
@@ -11,6 +11,6 @@ require (
 require (
 	cloud.google.com/go/compute v1.20.1 // indirect
 	github.com/golang/protobuf v1.5.3 // indirect
-	golang.org/x/net v0.12.0 // indirect
+	golang.org/x/net v0.15.0 // indirect
 	google.golang.org/protobuf v1.31.0 // indirect
 )

google/appengine_gen1.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build appengine
-// +build appengine
 
 // This file applies to App Engine first generation runtimes (<= Go 1.9).
 

google/appengine_gen2_flex.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build !appengine
-// +build !appengine
 
 // This file applies to App Engine second generation runtimes (>= Go 1.11) and App Engine flexible.
 

internal/client_appengine.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build appengine
-// +build appengine
 
 package internal
 

internal/token.go

@@ -18,6 +18,7 @@ import (
 	"strconv"
 	"strings"
 	"sync"
+	"sync/atomic"
 	"time"
 )
 
@@ -115,41 +116,60 @@ const (
 	AuthStyleInHeader AuthStyle = 2
 )
 
-// authStyleCache is the set of tokenURLs we've successfully used via
+// LazyAuthStyleCache is a backwards compatibility compromise to let Configs
+// have a lazily-initialized AuthStyleCache.
+//
+// The two users of this, oauth2.Config and oauth2/clientcredentials.Config,
+// both would ideally just embed an unexported AuthStyleCache but because both
+// were historically allowed to be copied by value we can't retroactively add an
+// uncopyable Mutex to them.
+//
+// We could use an atomic.Pointer, but that was added recently enough (in Go
+// 1.18) that we'd break Go 1.17 users where the tests as of 2023-08-03
+// still pass. By using an atomic.Value, it supports both Go 1.17 and
+// copying by value, even if that's not ideal.
+type LazyAuthStyleCache struct {
+	v atomic.Value // of *AuthStyleCache
+}
+
+func (lc *LazyAuthStyleCache) Get() *AuthStyleCache {
+	if c, ok := lc.v.Load().(*AuthStyleCache); ok {
+		return c
+	}
+	c := new(AuthStyleCache)
+	if !lc.v.CompareAndSwap(nil, c) {
+		c = lc.v.Load().(*AuthStyleCache)
+	}
+	return c
+}
+
+// AuthStyleCache is the set of tokenURLs we've successfully used via
 // RetrieveToken and which style auth we ended up using.
 // It's called a cache, but it doesn't (yet?) shrink. It's expected that
 // the set of OAuth2 servers a program contacts over time is fixed and
 // small.
-var authStyleCache struct {
-	sync.Mutex
-	m map[string]AuthStyle // keyed by tokenURL
-}
-
-// ResetAuthCache resets the global authentication style cache used
-// for AuthStyleUnknown token requests.
-func ResetAuthCache() {
-	authStyleCache.Lock()
-	defer authStyleCache.Unlock()
-	authStyleCache.m = nil
+type AuthStyleCache struct {
+	mu sync.Mutex
+	m  map[string]AuthStyle // keyed by tokenURL
 }
 
 // lookupAuthStyle reports which auth style we last used with tokenURL
 // when calling RetrieveToken and whether we have ever done so.
-func lookupAuthStyle(tokenURL string) (style AuthStyle, ok bool) {
-	authStyleCache.Lock()
-	defer authStyleCache.Unlock()
-	style, ok = authStyleCache.m[tokenURL]
+func (c *AuthStyleCache) lookupAuthStyle(tokenURL string) (style AuthStyle, ok bool) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	style, ok = c.m[tokenURL]
 	return
 }
 
 // setAuthStyle adds an entry to authStyleCache, documented above.
-func setAuthStyle(tokenURL string, v AuthStyle) {
-	authStyleCache.Lock()
-	defer authStyleCache.Unlock()
-	if authStyleCache.m == nil {
-		authStyleCache.m = make(map[string]AuthStyle)
+func (c *AuthStyleCache) setAuthStyle(tokenURL string, v AuthStyle) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	if c.m == nil {
+		c.m = make(map[string]AuthStyle)
 	}
-	authStyleCache.m[tokenURL] = v
+	c.m[tokenURL] = v
 }
 
 // newTokenRequest returns a new *http.Request to retrieve a new token
@@ -189,10 +209,10 @@ func cloneURLValues(v url.Values) url.Values {
 	return v2
 }
 
-func RetrieveToken(ctx context.Context, clientID, clientSecret, tokenURL string, v url.Values, authStyle AuthStyle) (*Token, error) {
+func RetrieveToken(ctx context.Context, clientID, clientSecret, tokenURL string, v url.Values, authStyle AuthStyle, styleCache *AuthStyleCache) (*Token, error) {
 	needsAuthStyleProbe := authStyle == 0
 	if needsAuthStyleProbe {
-		if style, ok := lookupAuthStyle(tokenURL); ok {
+		if style, ok := styleCache.lookupAuthStyle(tokenURL); ok {
 			authStyle = style
 			needsAuthStyleProbe = false
 		} else {
@@ -222,7 +242,7 @@ func RetrieveToken(ctx context.Context, clientID, clientSecret, tokenURL string,
 		token, err = doTokenRoundTrip(ctx, req)
 	}
 	if needsAuthStyleProbe && err == nil {
-		setAuthStyle(tokenURL, authStyle)
+		styleCache.setAuthStyle(tokenURL, authStyle)
 	}
 	// Don't overwrite `RefreshToken` with an empty value
 	// if this was a token refreshing request.

internal/token_test.go

@@ -16,7 +16,7 @@ import (
 )
 
 func TestRetrieveToken_InParams(t *testing.T) {
-	ResetAuthCache()
+	styleCache := new(AuthStyleCache)
 	const clientID = "client-id"
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if got, want := r.FormValue("client_id"), clientID; got != want {
@@ -29,14 +29,14 @@ func TestRetrieveToken_InParams(t *testing.T) {
 		io.WriteString(w, `{"access_token": "ACCESS_TOKEN", "token_type": "bearer"}`)
 	}))
 	defer ts.Close()
-	_, err := RetrieveToken(context.Background(), clientID, "", ts.URL, url.Values{}, AuthStyleInParams)
+	_, err := RetrieveToken(context.Background(), clientID, "", ts.URL, url.Values{}, AuthStyleInParams, styleCache)
 	if err != nil {
 		t.Errorf("RetrieveToken = %v; want no error", err)
 	}
 }
 
 func TestRetrieveTokenWithContexts(t *testing.T) {
-	ResetAuthCache()
+	styleCache := new(AuthStyleCache)
 	const clientID = "client-id"
 
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
@@ -45,7 +45,7 @@ func TestRetrieveTokenWithContexts(t *testing.T) {
 	}))
 	defer ts.Close()
 
-	_, err := RetrieveToken(context.Background(), clientID, "", ts.URL, url.Values{}, AuthStyleUnknown)
+	_, err := RetrieveToken(context.Background(), clientID, "", ts.URL, url.Values{}, AuthStyleUnknown, styleCache)
 	if err != nil {
 		t.Errorf("RetrieveToken (with background context) = %v; want no error", err)
 	}
@@ -58,7 +58,7 @@ func TestRetrieveTokenWithContexts(t *testing.T) {
 
 	ctx, cancel := context.WithCancel(context.Background())
 	cancel()
-	_, err = RetrieveToken(ctx, clientID, "", cancellingts.URL, url.Values{}, AuthStyleUnknown)
+	_, err = RetrieveToken(ctx, clientID, "", cancellingts.URL, url.Values{}, AuthStyleUnknown, styleCache)
 	close(retrieved)
 	if err == nil {
 		t.Errorf("RetrieveToken (with cancelled context) = nil; want error")

oauth2.go

@@ -58,6 +58,10 @@ type Config struct {
 
 	// Scope specifies optional requested permissions.
 	Scopes []string
+
+	// authStyleCache caches which auth style to use when Endpoint.AuthStyle is
+	// the zero value (AuthStyleAutoDetect).
+	authStyleCache internal.LazyAuthStyleCache
 }
 
 // A TokenSource is anything that can return a token.

oauth2_test.go

@@ -15,8 +15,6 @@ import (
 	"net/url"
 	"testing"
 	"time"
-
-	"golang.org/x/oauth2/internal"
 )
 
 type mockTransport struct {
@@ -355,7 +353,6 @@ func TestExchangeRequest_BadResponseType(t *testing.T) {
 }
 
 func TestExchangeRequest_NonBasicAuth(t *testing.T) {
-	internal.ResetAuthCache()
 	tr := &mockTransport{
 		rt: func(r *http.Request) (w *http.Response, err error) {
 			headerAuth := r.Header.Get("Authorization")
@@ -427,7 +424,6 @@ func TestPasswordCredentialsTokenRequest(t *testing.T) {
 }
 
 func TestTokenRefreshRequest(t *testing.T) {
-	internal.ResetAuthCache()
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if r.URL.String() == "/somethingelse" {
 			return

token.go

@@ -164,7 +164,7 @@ func tokenFromInternal(t *internal.Token) *Token {
 // This token is then mapped from *internal.Token into an *oauth2.Token which is returned along
 // with an error..
 func retrieveToken(ctx context.Context, c *Config, v url.Values) (*Token, error) {
-	tk, err := internal.RetrieveToken(ctx, c.ClientID, c.ClientSecret, c.Endpoint.TokenURL, v, internal.AuthStyle(c.Endpoint.AuthStyle))
+	tk, err := internal.RetrieveToken(ctx, c.ClientID, c.ClientSecret, c.Endpoint.TokenURL, v, internal.AuthStyle(c.Endpoint.AuthStyle), c.authStyleCache.Get())
 	if err != nil {
 		if rErr, ok := err.(*internal.RetrieveError); ok {
 			return nil, (*RetrieveError)(rErr)