jwt_encode is not working

[yingshaoxo]

The token_string returns nothing

---

func Jwt_encode(data map[string]interface{}, secret_string string) string {
	new_data := jwt.MapClaims{}
	for key, value := range data {
		new_data[key] = value
	}

	token := jwt.NewWithClaims(jwt.SigningMethodHS256, new_data)
	token_string, _ := token.SignedString(secret_string)

	return token_string
}

package main

import (
	"log"
	"testing"

	"github.com/yingshaoxo/gopython/jwt_tool"
)

func Test_jwt(t *testing.T) {
	secret := "no way"

	data := make(map[string]interface{})
	data["user"] = "yingshaoxo"

	jwt_string := jwt_tool.Jwt_encode(data, secret)
	log.Println(jwt_string)

	new_data, _ := jwt_tool.Jwt_decode(jwt_string, secret)

	log.Println(data)
	log.Println(new_data)
}

[oxisto]

You are using string as the key for an HMAC. The signing method expects a []byte as seen in the README "The HMAC signing method (HS256,HS384,HS512) expect []byte values for signing and validation" or in the example:

jwt/example_test.go

Lines 16 to 29 in 0d2f0d4

	func ExampleNewWithClaims_registeredClaims() {
	mySigningKey := []byte("AllYourBase")
	// Create the Claims
	claims := &jwt.RegisteredClaims{
	ExpiresAt: jwt.NewNumericDate(time.Unix(1516239022, 0)),
	Issuer: "test",
	}
	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
	ss, err := token.SignedString(mySigningKey)
	fmt.Printf("%v %v", ss, err)
	//Output: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJ0ZXN0IiwiZXhwIjoxNTE2MjM5MDIyfQ.0XN_1Tpp9FszFOonIBpwha0c_SfnNI22DhTnjMshPg8 <nil>
	}

Note, that you are intentionally ignoring the error of SignedString. This error contains more information why it is failing and this case would you provide with an error that you are using the wrong key type for this signing algorithm.

[yingshaoxo]

Alright, thanks, now I've solved this problem:

func Jwt_encode(data map[string]interface{}, secret_string string) string {
	new_data := jwt.MapClaims{}
	for key, value := range data {
		new_data[key] = value
	}

	secret_string_bytes := string_tool.String_to_bytes(secret_string)

	token := jwt.NewWithClaims(jwt.SigningMethodHS256, new_data)
	token_string, _ := token.SignedString(secret_string_bytes)

	return token_string
}