Use jwt-go (golang-jwt) instead of deprecated jws (x/oauth2/jws)

golang.org/x/oauth2/jws is deprecated: this package is not intended for public use and
might be removed in the future. It exists for internal use only. Please switch to another
JWS package or copy this package into your own source tree.

github.com/golang-jwt/jwt/v4 seems to be a good alternative, and was already
an implicit dependency.

.golangci.yml

@@ -33,11 +33,6 @@ issues:
       - staticcheck
       text: 'SA1019: "github.com/rclone/rclone/cmd/serve/httplib" is deprecated'
 
-    # TODO: Remove if/when this is fixed by merging PR #6277.
-    - linters:
-      - staticcheck
-      text: 'SA1019: "golang.org/x/oauth2/jws" is deprecated'
-
 run:
   # timeout for analysis, e.g. 30s, 5m, default is 1m
   timeout: 10m

backend/box/box.go

@@ -27,6 +27,7 @@ import (
 	"sync/atomic"
 	"time"
 
+	"github.com/golang-jwt/jwt/v4"
 	"github.com/rclone/rclone/backend/box/api"
 	"github.com/rclone/rclone/fs"
 	"github.com/rclone/rclone/fs/config"
@@ -45,7 +46,6 @@ import (
 	"github.com/rclone/rclone/lib/rest"
 	"github.com/youmark/pkcs8"
 	"golang.org/x/oauth2"
-	"golang.org/x/oauth2/jws"
 )
 
 const (
@@ -76,6 +76,11 @@ var (
 	}
 )
 
+type boxCustomClaims struct {
+	jwt.RegisteredClaims
+	BoxSubType string `json:"box_sub_type,omitempty"`
+}
+
 // Register with Fs
 func init() {
 	fs.Register(&fs.RegInfo{
@@ -178,7 +183,7 @@ func refreshJWTToken(ctx context.Context, jsonFile string, boxSubType string, na
 	signingHeaders := getSigningHeaders(boxConfig)
 	queryParams := getQueryParams(boxConfig)
 	client := fshttp.NewClient(ctx)
-	err = jwtutil.Config("box", name, claims, signingHeaders, queryParams, privateKey, m, client)
+	err = jwtutil.Config("box", name, tokenURL, *claims, signingHeaders, queryParams, privateKey, m, client)
 	return err
 }
 
@@ -194,34 +199,29 @@ func getBoxConfig(configFile string) (boxConfig *api.ConfigJSON, err error) {
 	return boxConfig, nil
 }
 
-func getClaims(boxConfig *api.ConfigJSON, boxSubType string) (claims *jws.ClaimSet, err error) {
+func getClaims(boxConfig *api.ConfigJSON, boxSubType string) (claims *boxCustomClaims, err error) {
 	val, err := jwtutil.RandomHex(20)
 	if err != nil {
 		return nil, fmt.Errorf("box: failed to generate random string for jti: %w", err)
 	}
 
-	claims = &jws.ClaimSet{
-		Iss: boxConfig.BoxAppSettings.ClientID,
-		Sub: boxConfig.EnterpriseID,
-		Aud: tokenURL,
-		Exp: time.Now().Add(time.Second * 45).Unix(),
-		PrivateClaims: map[string]interface{}{
-			"box_sub_type": boxSubType,
-			"aud":          tokenURL,
-			"jti":          val,
+	claims = &boxCustomClaims{
+		RegisteredClaims: jwt.RegisteredClaims{
+			ID:        val,
+			Issuer:    boxConfig.BoxAppSettings.ClientID,
+			Subject:   boxConfig.EnterpriseID,
+			Audience:  jwt.ClaimStrings{tokenURL},
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(time.Second * 45)),
 		},
+		BoxSubType: boxSubType,
 	}
-
 	return claims, nil
 }
 
-func getSigningHeaders(boxConfig *api.ConfigJSON) *jws.Header {
-	signingHeaders := &jws.Header{
-		Algorithm: "RS256",
-		Typ:       "JWT",
-		KeyID:     boxConfig.BoxAppSettings.AppAuth.PublicKeyID,
+func getSigningHeaders(boxConfig *api.ConfigJSON) map[string]interface{} {
+	signingHeaders := map[string]interface{}{
+		"kid": boxConfig.BoxAppSettings.AppAuth.PublicKeyID,
 	}
-
 	return signingHeaders
 }
 

go.mod

@@ -141,7 +141,7 @@ require (
 require (
 	github.com/Microsoft/go-winio v0.5.2 // indirect
 	github.com/ProtonMail/go-crypto v0.0.0-20230217124315-7d5c6f04bbb8
-	github.com/golang-jwt/jwt/v4 v4.5.0 // indirect
+	github.com/golang-jwt/jwt/v4 v4.5.0
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
 	github.com/google/go-querystring v1.1.0 // indirect
 	github.com/pkg/xattr v0.4.9

lib/jwtutil/jwtutil.go

@@ -14,12 +14,12 @@ import (
 	"strings"
 	"time"
 
+	"github.com/golang-jwt/jwt/v4"
 	"github.com/rclone/rclone/fs"
 	"github.com/rclone/rclone/fs/config/configmap"
 	"github.com/rclone/rclone/lib/oauthutil"
 
 	"golang.org/x/oauth2"
-	"golang.org/x/oauth2/jws"
 )
 
 // RandomHex creates a random string of the given length
@@ -32,12 +32,16 @@ func RandomHex(n int) (string, error) {
 }
 
 // Config configures rclone using JWT
-func Config(id, name string, claims *jws.ClaimSet, header *jws.Header, queryParams map[string]string, privateKey *rsa.PrivateKey, m configmap.Mapper, client *http.Client) (err error) {
-	payload, err := jws.Encode(header, claims, privateKey)
+func Config(id, name, url string, claims jwt.Claims, headerParams map[string]interface{}, queryParams map[string]string, privateKey *rsa.PrivateKey, m configmap.Mapper, client *http.Client) (err error) {
+	jwtToken := jwt.NewWithClaims(jwt.SigningMethodRS256, claims)
+	for key, value := range headerParams {
+		jwtToken.Header[key] = value
+	}
+	payload, err := jwtToken.SignedString(privateKey)
 	if err != nil {
 		return fmt.Errorf("jwtutil: failed to encode payload: %w", err)
 	}
-	req, err := http.NewRequest("POST", claims.Aud, nil)
+	req, err := http.NewRequest("POST", url, nil)
 	if err != nil {
 		return fmt.Errorf("jwtutil: failed to create new request: %w", err)
 	}
@@ -49,7 +53,7 @@ func Config(id, name string, claims *jws.ClaimSet, header *jws.Header, queryPara
 	}
 	queryString := q.Encode()
 
-	req, err = http.NewRequest("POST", claims.Aud, bytes.NewBuffer([]byte(queryString)))
+	req, err = http.NewRequest("POST", url, bytes.NewBuffer([]byte(queryString)))
 	if err != nil {
 		return fmt.Errorf("jwtutil: failed to create new request: %w", err)
 	}