Extract encoders/decoders to extra struct

parser.go

@@ -20,14 +20,18 @@ type Parser struct {
 
 	validator *Validator
 
+	decoders
+}
+
+type decoders struct {
+	jsonUnmarshal JSONUnmarshalFunc
+	base64Decode  Base64DecodeFunc
+
 	// This field is disabled when using a custom base64 encoder.
 	decodeStrict bool
 
 	// This field is disabled when using a custom base64 encoder.
 	decodePaddingAllowed bool
-
-	unmarshalFunc    JSONUnmarshalFunc
-	base64DecodeFunc Base64DecodeFunc
 }
 
 // NewParser creates a new Parser with the specified options
@@ -156,8 +160,8 @@ func (p *Parser) ParseUnverified(tokenString string, claims Claims) (token *Toke
 
 	// Choose our JSON decoder. If no custom function is supplied, we use the standard library.
 	var unmarshal JSONUnmarshalFunc
-	if p.unmarshalFunc != nil {
-		unmarshal = p.unmarshalFunc
+	if p.jsonUnmarshal != nil {
+		unmarshal = p.jsonUnmarshal
 	} else {
 		unmarshal = json.Unmarshal
 	}
@@ -214,8 +218,8 @@ func (p *Parser) ParseUnverified(tokenString string, claims Claims) (token *Toke
 // take into account whether the [Parser] is configured with additional options,
 // such as [WithStrictDecoding] or [WithPaddingAllowed].
 func (p *Parser) DecodeSegment(seg string) ([]byte, error) {
-	if p.base64DecodeFunc != nil {
-		return p.base64DecodeFunc(seg)
+	if p.base64Decode != nil {
+		return p.base64Decode(seg)
 	}
 
 	encoding := base64.RawURLEncoding

parser_option.go

@@ -130,13 +130,13 @@ func WithStrictDecoding() ParserOption {
 // WithJSONUnmarshal supports a custom [JSONUnmarshal] to use in parsing the JWT.
 func WithJSONUnmarshal(f JSONUnmarshalFunc) ParserOption {
 	return func(p *Parser) {
-		p.unmarshalFunc = f
+		p.jsonUnmarshal = f
 	}
 }
 
 // WithBase64Decoder supports a custom [Base64Decoder] to use in parsing the JWT.
 func WithBase64Decoder(f Base64DecodeFunc) ParserOption {
 	return func(p *Parser) {
-		p.base64DecodeFunc = f
+		p.base64Decode = f
 	}
 }

token.go

@@ -34,8 +34,13 @@ type Token struct {
 	Claims    Claims                 // Claims is the second segment of the token in decoded form
 	Signature []byte                 // Signature is the third segment of the token in decoded form.  Populated when you Parse a token
 	Valid     bool                   // Valid specifies if the token is valid.  Populated when you Parse/Verify a token
-	jsonEncoder   JSONMarshalFunc        // jsonEncoder is the custom json encoder/decoder
-	base64Encoder Base64EncodeFunc       // base64Encoder is the custom base64 encoder/decoder
+
+	encoders
+}
+
+type encoders struct {
+	jsonMarshal  JSONMarshalFunc  // jsonEncoder is the custom json encoder/decoder
+	base64Encode Base64EncodeFunc // base64Encoder is the custom base64 encoder/decoder
 }
 
 // New creates a new [Token] with the specified signing method and an empty map
@@ -85,8 +90,8 @@ func (t *Token) SignedString(key interface{}) (string, error) {
 // straight for the SignedString.
 func (t *Token) SigningString() (string, error) {
 	var marshal JSONMarshalFunc
-	if t.jsonEncoder != nil {
-		marshal = t.jsonEncoder
+	if t.jsonMarshal != nil {
+		marshal = t.jsonMarshal
 	} else {
 		marshal = json.Marshal
 	}
@@ -110,8 +115,8 @@ func (t *Token) SigningString() (string, error) {
 // than a global function.
 func (t *Token) EncodeSegment(seg []byte) string {
 	var enc Base64EncodeFunc
-	if t.base64Encoder != nil {
-		enc = t.base64Encoder
+	if t.base64Encode != nil {
+		enc = t.base64Encode
 	} else {
 		enc = base64.RawURLEncoding.EncodeToString
 	}

token_option.go

@@ -6,12 +6,12 @@ type TokenOption func(*Token)
 
 func WithJSONEncoder(f JSONMarshalFunc) TokenOption {
 	return func(token *Token) {
-		token.jsonEncoder = f
+		token.jsonMarshal = f
 	}
 }
 
 func WithBase64Encoder(f Base64EncodeFunc) TokenOption {
 	return func(token *Token) {
-		token.base64Encoder = f
+		token.base64Encode = f
 	}
 }