major refactoring

token.go

@@ -14,7 +14,7 @@ type Token struct {
 	data         string
 	signature    string
 	rawSignature []byte
-	header       map[string]interface{}
+	header       Claims
 	Claims       Claims
 }
 
@@ -34,7 +34,7 @@ func (t *Token) RawSig() []byte {
 }
 
 // Header returns the Tokens header
-func (t *Token) Header() map[string]interface{} {
+func (t *Token) Header() Claims {
 	return t.header
 }
 
@@ -54,7 +54,7 @@ func NewToken(claims Claims, hash Hash) *Token {
 		hash = NewHS256()
 	}
 	return &Token{
-		header: map[string]interface{}{
+		header: Claims{
 			"alg": hash.Alg(),
 			"typ": typ,
 		},