added config options and nonce

LICENSE

@@ -1,4 +1,4 @@
-Copyright (C) 2018 Marius Schellenberger
+Copyright (C) 2025 Marius Schellenberger
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without

blacklist.go

@@ -1,4 +1,4 @@
-// Copyright (C) 2018 Marius Schellenberger
+// Copyright (C) 2025 Marius Schellenberger
 
 package jwt
 

claims.go

@@ -1,4 +1,4 @@
-// Copyright (C) 2018 Marius Schellenberger
+// Copyright (C) 2025 Marius Schellenberger
 
 package jwt
 
@@ -30,37 +30,28 @@ func (c Claims) GetBool(key string) (b bool) {
 
 // GetInt returns an int from the claims map
 func (c Claims) GetInt(key string) (i int) {
-	if f, ok := c.getFloat64(key); ok {
-		return int(f)
-	}
-	if v, ok := c.Get(key); ok && v != nil {
-		i, _ = v.(int)
-	}
+	i = int(c.GetInt64(key))
 	return
 }
 
 // GetInt64 returns an int64 from the claims map
 func (c Claims) GetInt64(key string) (i int64) {
-	if f, ok := c.getFloat64(key); ok {
-		return int64(f)
-	}
 	if v, ok := c.Get(key); ok && v != nil {
-		i, _ = v.(int64)
+		switch val := v.(type) {
+		case int64:
+			i = val
+		case float64:
+			i = int64(val)
+		}
 	}
 	return
 }
 
 // getFloat64 returns a float64 and ok from the claims map
-func (c Claims) getFloat64(key string) (f float64, fok bool) {
-	if v, ok := c.Get(key); ok && v != nil {
-		f, fok = v.(float64)
-	}
-	return
-}
-
-// GetFloat64 returns a float64 from the claims map
 func (c Claims) GetFloat64(key string) (f float64) {
-	f, _ = c.getFloat64(key)
+	if v, ok := c.Get(key); ok && v != nil {
+		f, _ = v.(float64)
+	}
 	return
 }
 

encoding.go

@@ -1,4 +1,4 @@
-// Copyright (C) 2018 Marius Schellenberger
+// Copyright (C) 2025 Marius Schellenberger
 
 package jwt
 

hash.go

@@ -1,4 +1,4 @@
-// Copyright (C) 2018 Marius Schellenberger
+// Copyright (C) 2025 Marius Schellenberger
 
 package jwt
 
@@ -14,19 +14,25 @@ const (
 	HS512Name = "HS512"
 )
 
-// ParseHash returns the Hash type equal to the input string
-func ParseHash(alg string) Hash {
+// NewHash returns the Hash type equal to the input string
+func NewHash(alg string) Hash {
 	switch alg {
 	case HS256Name:
-		return NewHS256()
+		return hs256
 	case HS384Name:
-		return NewHS384()
+		return hs384
 	case HS512Name:
-		return NewHS512()
+		return hs512
 	}
 	return nil
 }
 
+var (
+	hs256 = HS256{}
+	hs384 = HS384{}
+	hs512 = HS512{}
+)
+
 // Hash is the hashsum interface for signing the jwt
 type Hash interface {
 	Hash() hash.Hash
@@ -36,11 +42,6 @@ type Hash interface {
 // HS256 implements the Hash interface with SHA256
 type HS256 struct{}
 
-// NewHS256 returns a new HS256 instance
-func NewHS256() Hash {
-	return HS256{}
-}
-
 // Alg returns the algorithm name "HS256"
 func (HS256) Alg() string {
 	return HS256Name
@@ -54,11 +55,6 @@ func (HS256) Hash() hash.Hash {
 // HS384 implements the Hash interface with SHA384
 type HS384 struct{}
 
-// NewHS384 returns a new HS384 instance
-func NewHS384() Hash {
-	return HS384{}
-}
-
 // Alg returns the algorithm name "HS384"
 func (HS384) Alg() string {
 	return HS384Name
@@ -72,11 +68,6 @@ func (HS384) Hash() hash.Hash {
 // HS512 implements the Hash interface with SHA512
 type HS512 struct{}
 
-// NewHS512 returns a new HS512 instance
-func NewHS512() Hash {
-	return HS512{}
-}
-
 // Alg returns the algorithm name "HS512"
 func (HS512) Alg() string {
 	return HS512Name

jwt.go

@@ -1,4 +1,4 @@
-// Copyright (C) 2018 Marius Schellenberger
+// Copyright (C) 2025 Marius Schellenberger
 
 // Package jwt provides a easy to use JSON Web Token and blacklisting library
 package jwt
@@ -31,6 +31,8 @@ const (
 	ExpClaim = "exp"
 	// NbfClaim is the nbf claim name
 	NbfClaim = "nbf"
+	// NonceClaim
+	NonceClaim = "nonce"
 	// TokenSeparator is the tokens separator char
 	TokenSeparator = "."
 )
@@ -57,14 +59,39 @@ var (
 	ErrInvalidKeySize      = errors.New(jwtErr + "invalid secret key size")
 )
 
+type JWTOption func(*JWT)
+
+func WithExpiry(expiry time.Duration) JWTOption {
+	return func(jwt *JWT) {
+		jwt.expiry = expiry
+	}
+}
+
+func WithBlacklist(blacklist Blacklist) JWTOption {
+	return func(jwt *JWT) {
+		jwt.blacklist = blacklist
+	}
+}
+func WithSecret(secret io.Reader) JWTOption {
+	return func(jwt *JWT) {
+		jwt.secretReader = secret
+	}
+}
+func WithNonce() JWTOption {
+	return func(jwt *JWT) {
+		jwt.nonce = true
+	}
+}
+
 // JWT represents the JSON Web Token signing and blacklisting infrastructure
 type JWT struct {
-	key    []byte
-	expiry time.Duration
-
-	blacklist Blacklist
-	stopOnce  sync.Once
-	done      chan struct{}
+	secretReader io.Reader
+	key          []byte
+	expiry       time.Duration
+	blacklist    Blacklist
+	nonce        bool
+	stopOnce     sync.Once
+	done         chan struct{}
 }
 
 // New returns a new JWT object with the given expiry timeout.
@@ -73,14 +100,18 @@ type JWT struct {
 // If secret is nil the DefaultSecretReader is used.
 // If blacklisting is enabled, the JWT object leaks a goroutine to garbage-collect expired blacklisted tokens.
 // Call the Stop() method to exit the goroutine.
-func New(expiry time.Duration, blacklist Blacklist, secret io.Reader) (*JWT, error) {
-	if expiry <= 0 {
-		expiry = DefaultExpiry
+func New(options ...JWTOption) (*JWT, error) {
+	jwt := &JWT{}
+	for _, option := range options {
+		option(jwt)
 	}
-	if secret == nil {
-		secret = DefaultSecretReader
+	if jwt.expiry <= 0 {
+		jwt.expiry = DefaultExpiry
 	}
-	secret = io.LimitReader(secret, KeySize)
+	if jwt.secretReader == nil {
+		jwt.secretReader = DefaultSecretReader
+	}
+	secret := io.LimitReader(jwt.secretReader, KeySize)
 	key := make([]byte, KeySize)
 	i, err := secret.Read(key)
 	if err != nil {
@@ -89,12 +120,8 @@ func New(expiry time.Duration, blacklist Blacklist, secret io.Reader) (*JWT, err
 	if i < KeySize {
 		return nil, ErrInvalidKeySize
 	}
-	jwt := &JWT{
-		key:       key,
-		expiry:    expiry,
-		blacklist: blacklist,
-	}
-	if blacklist != nil {
+	jwt.key = key
+	if jwt.blacklist != nil {
 		jwt.done = make(chan struct{})
 		go jwt.clean()
 	}
@@ -128,7 +155,7 @@ func (jwt *JWT) Invalidate(t *Token) error {
 	if t.Header.GetString(TypClaim) != Typ {
 		return ErrNoJWT
 	}
-	h := ParseHash(t.Header.GetString(AlgClaim))
+	h := NewHash(t.Header.GetString(AlgClaim))
 	if h == nil {
 		return ErrUnsupportedAlg
 	}
@@ -190,7 +217,7 @@ func (jwt *JWT) Sign(t *Token) (err error) {
 	if t.Header.GetString(TypClaim) != Typ {
 		return ErrNoJWT
 	}
-	h := ParseHash(t.Header.GetString(AlgClaim))
+	h := NewHash(t.Header.GetString(AlgClaim))
 	if h == nil {
 		return ErrUnsupportedAlg
 	}
@@ -201,6 +228,9 @@ func (jwt *JWT) Sign(t *Token) (err error) {
 	if _, ok := t.Claims.Get(NbfClaim); !ok {
 		t.Claims.Set(NbfClaim, NewNbf(now))
 	}
+	if jwt.nonce {
+		t.Claims.Set(NonceClaim, enc.EncodeToString(key16()))
+	}
 	head, err := json.Marshal(t.Header)
 	if err != nil {
 		return
@@ -230,7 +260,7 @@ func (jwt *JWT) Verify(t *Token) error {
 	if t.Header.GetString(TypClaim) != Typ {
 		return ErrNoJWT
 	}
-	h := ParseHash(t.Header.GetString(AlgClaim))
+	h := NewHash(t.Header.GetString(AlgClaim))
 	if h == nil {
 		return ErrUnsupportedAlg
 	}

jwt_test.go

@@ -1,4 +1,4 @@
-// Copyright (C) 2018 Marius Schellenberger
+// Copyright (C) 2025 Marius Schellenberger
 
 package jwt
 
@@ -17,7 +17,10 @@ var claims = Claims{
 }
 
 func TestValidate(t *testing.T) {
-	jwt, err := New(time.Second, NewMemBlacklist(), nil)
+	jwt, err := New(
+		WithExpiry(time.Second),
+		WithBlacklist(NewMemBlacklist()),
+	)
 	if err != nil {
 		t.Error(err)
 	}
@@ -83,8 +86,35 @@ func TestValidate(t *testing.T) {
 	}
 }
 
+func TestNonce(t *testing.T) {
+	jwt, err := New(
+		WithExpiry(time.Second),
+		WithNonce(),
+	)
+	if err != nil {
+		t.Error(err)
+	}
+	token := NewToken(claims.Copy(), nil)
+	err = jwt.Sign(token)
+	if err != nil {
+		t.Error(err)
+	}
+	nt, err := DecodeToken(token.String())
+	if err != nil {
+		t.Error(err)
+	}
+	err = jwt.Verify(nt)
+	if err != nil {
+		t.Error(err)
+	}
+	nonce := nt.Claims.GetString(NonceClaim)
+	if nonce == "" {
+		t.Error(errors.New("nonce is empty"))
+	}
+}
+
 func TestNoBlacklist(t *testing.T) {
-	jwt, err := New(time.Second, nil, nil)
+	jwt, err := New(WithExpiry(time.Second))
 	if err != nil {
 		t.Error(err)
 	}
@@ -118,21 +148,27 @@ func TestNoBlacklist(t *testing.T) {
 }
 
 func TestEmptySecretReader(t *testing.T) {
-	_, err := New(time.Second, nil, new(bytes.Buffer))
+	_, err := New(
+		WithExpiry(time.Second),
+		WithSecret(new(bytes.Buffer)),
+	)
 	if err == nil {
 		t.Error(errors.New("error should be secret reader error"))
 	}
 }
 
 func TestInvalidSecretReader(t *testing.T) {
-	_, err := New(time.Second, nil, bytes.NewBufferString("123"))
+	_, err := New(
+		WithExpiry(time.Second),
+		WithSecret(bytes.NewBufferString("123")),
+	)
 	if err != ErrInvalidKeySize {
 		t.Error(errors.New("error should be invalid key size"))
 	}
 }
 
 func BenchmarkDecodeToken(b *testing.B) {
-	jwt, _ := New(0, nil, nil)
+	jwt, _ := New()
 	t := NewToken(claims.Copy(), nil)
 	jwt.Sign(t)
 	token := t.String()
@@ -145,19 +181,19 @@ func BenchmarkDecodeToken(b *testing.B) {
 func BenchmarkNew(b *testing.B) {
 	b.ReportAllocs()
 	for i := 0; i < b.N; i++ {
-		New(0, nil, nil)
+		New()
 	}
 }
 
 func BenchmarkNewWithBlacklist(b *testing.B) {
 	b.ReportAllocs()
 	for i := 0; i < b.N; i++ {
-		New(0, NewMemBlacklist(), nil)
+		New(WithBlacklist(NewMemBlacklist()))
 	}
 }
 
 func BenchmarkSignHS256(b *testing.B) {
-	jwt, _ := New(0, nil, nil)
+	jwt, _ := New()
 	t := NewToken(claims.Copy(), nil)
 	b.ReportAllocs()
 	for i := 0; i < b.N; i++ {
@@ -166,8 +202,8 @@ func BenchmarkSignHS256(b *testing.B) {
 }
 
 func BenchmarkSignHS384(b *testing.B) {
-	jwt, _ := New(0, nil, nil)
-	t := NewToken(claims.Copy(), NewHS384())
+	jwt, _ := New()
+	t := NewToken(claims.Copy(), NewHash(HS384Name))
 	b.ReportAllocs()
 	for i := 0; i < b.N; i++ {
 		jwt.Sign(t)
@@ -175,8 +211,8 @@ func BenchmarkSignHS384(b *testing.B) {
 }
 
 func BenchmarkSignHS512(b *testing.B) {
-	jwt, _ := New(0, nil, nil)
-	t := NewToken(claims.Copy(), NewHS512())
+	jwt, _ := New()
+	t := NewToken(claims.Copy(), NewHash(HS512Name))
 	b.ReportAllocs()
 	for i := 0; i < b.N; i++ {
 		jwt.Sign(t)
@@ -184,7 +220,7 @@ func BenchmarkSignHS512(b *testing.B) {
 }
 
 func BenchmarkVerifyHS256(b *testing.B) {
-	jwt, _ := New(0, nil, nil)
+	jwt, _ := New()
 	t := NewToken(claims.Copy(), nil)
 	jwt.Sign(t)
 	b.ReportAllocs()
@@ -194,8 +230,8 @@ func BenchmarkVerifyHS256(b *testing.B) {
 }
 
 func BenchmarkVerifyHS384(b *testing.B) {
-	jwt, _ := New(0, nil, nil)
-	t := NewToken(claims.Copy(), NewHS384())
+	jwt, _ := New()
+	t := NewToken(claims.Copy(), NewHash(HS384Name))
 	jwt.Sign(t)
 	b.ReportAllocs()
 	for i := 0; i < b.N; i++ {
@@ -204,8 +240,8 @@ func BenchmarkVerifyHS384(b *testing.B) {
 }
 
 func BenchmarkVerifyHS512(b *testing.B) {
-	jwt, _ := New(0, nil, nil)
-	t := NewToken(claims.Copy(), NewHS512())
+	jwt, _ := New()
+	t := NewToken(claims.Copy(), NewHash(HS512Name))
 	jwt.Sign(t)
 	b.ReportAllocs()
 	for i := 0; i < b.N; i++ {

rand.go

@@ -0,0 +1,11 @@
+// Copyright (C) 2025 Marius Schellenberger
+
+package jwt
+
+import "crypto/rand"
+
+func key16() []byte {
+	b := make([]byte, 16)
+	rand.Read(b)
+	return b
+}

time.go

@@ -1,3 +1,5 @@
+// Copyright (C) 2025 Marius Schellenberger
+
 package jwt
 
 import "time"

token.go

@@ -1,4 +1,4 @@
-// Copyright (C) 2018 Marius Schellenberger
+// Copyright (C) 2025 Marius Schellenberger
 
 package jwt
 
@@ -45,7 +45,7 @@ func NewToken(claims Claims, hash Hash) *Token {
 		claims = make(Claims)
 	}
 	if hash == nil {
-		hash = NewHS256()
+		hash = NewHash(HS256Name)
 	}
 	return &Token{
 		Header: Claims{