60 lines
1.5 KiB
Go
60 lines
1.5 KiB
Go
package security
|
|
|
|
import (
|
|
"fmt"
|
|
"time"
|
|
|
|
"github.com/golang-jwt/jwt/v5"
|
|
)
|
|
|
|
// JWTService interface defines the contract for JWT operations
|
|
type JWTService interface {
|
|
GenerateToken(userID int, username string) (string, error)
|
|
ValidateToken(tokenString string) (jwt.MapClaims, error)
|
|
}
|
|
|
|
// JWTServiceImpl implements JWTService using golang-jwt
|
|
type JWTServiceImpl struct {
|
|
secret []byte
|
|
}
|
|
|
|
// NewJWTService creates a new JWT service
|
|
func NewJWTService(secret string) JWTService {
|
|
return &JWTServiceImpl{
|
|
secret: []byte(secret),
|
|
}
|
|
}
|
|
|
|
// GenerateToken generates a JWT token for a user
|
|
func (j *JWTServiceImpl) GenerateToken(userID int, username string) (string, error) {
|
|
claims := jwt.MapClaims{
|
|
"user_id": userID,
|
|
"username": username,
|
|
"exp": time.Now().Add(time.Hour * 24 * 7).Unix(), // 7 days
|
|
"iat": time.Now().Unix(),
|
|
}
|
|
|
|
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
|
|
return token.SignedString(j.secret)
|
|
}
|
|
|
|
// ValidateToken validates a JWT token and returns the claims
|
|
func (j *JWTServiceImpl) ValidateToken(tokenString string) (jwt.MapClaims, error) {
|
|
token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
|
|
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
|
|
return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
|
|
}
|
|
return j.secret, nil
|
|
})
|
|
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
|
|
return claims, nil
|
|
}
|
|
|
|
return nil, fmt.Errorf("invalid token")
|
|
}
|