package main
import (
"fmt"
"time"
"github.com/dgrijalva/jwt-go"
)
var secretKey = []byte("your_secret_key")
type CustomClaims struct {
UserID int `json:"user_id"`
Role string `json:"role"`
jwt.StandardClaims
}
func generateJWT(userID int, role string) (string, error) {
claims := CustomClaims{
UserID: userID,
Role: role,
StandardClaims: jwt.StandardClaims{
ExpiresAt: time.Now().Add(time.Hour * 24).Unix(), // Token expires in 24 hours
},
}
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
signedToken, err := token.SignedString(secretKey)
if err != nil {
return "", err
}
return signedToken, nil
}
func parseJWT(tokenString string) (*CustomClaims, error) {
token, err := jwt.ParseWithClaims(tokenString, &CustomClaims{}, func(token *jwt.Token) (interface{}, error) {
return secretKey, nil
})
if err != nil {
return nil, err
}
claims, ok := token.Claims.(*CustomClaims)
if !ok || !token.Valid {
return nil, fmt.Errorf("invalid token")
}
return claims, nil
}
func main() {
userID := 123
role := "admin"
token, err := generateJWT(userID, role)
if err != nil {
fmt.Println("Error generating JWT:", err)
return
}
fmt.Println("Generated JWT:", token)
parsedClaims, err := parseJWT(token)
if err != nil {
fmt.Println("Error parsing JWT:", err)
return
}
fmt.Printf("Parsed JWT claims: UserID=%d, Role=%s\n", parsedClaims.UserID, parsedClaims.Role)
}