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package auth
import (
"errors"
"os"
"strings"
"time"
"github.com/golang-jwt/jwt/v5"
"gorm.io/gorm"
)
// Key used for JWT encryption/decryption
var jwtKey = []byte(os.Getenv("JWT_SECRET"))
// Kind of JWT token
var TokenType = "Bearer"
// Extends JWT Claims with the UserID field
type Claims struct {
UserID int `json:"user_id"`
jwt.RegisteredClaims
}
// Generate a JWT token from an userID.
func GenerateJWT(userID int) (string, error) {
// Set expiration date for the token to 90 days
expirationTime := time.Now().Add(90 * 24 * time.Hour)
claims := &Claims{
UserID: userID,
RegisteredClaims: jwt.RegisteredClaims{
ExpiresAt: jwt.NewNumericDate(expirationTime),
},
}
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
tokenString, err := token.SignedString(jwtKey)
if err != nil {
return "", err
}
return TokenType + " " + tokenString, nil
}
// Validate a JWT token for a kind of time
func ValidateJWT(tokenString string) (*Claims, error) {
claims := &Claims{}
tokenParts := strings.Split(tokenString, " ")
if len(tokenParts) != 2 {
return nil, errors.New("not valid JWT")
}
if tokenParts[0] != TokenType {
return nil, errors.New("not valid JWT type")
}
token, err := jwt.ParseWithClaims(tokenParts[1], claims, func(token *jwt.Token) (interface{}, error) {
return jwtKey, nil
})
if err != nil {
return nil, err
}
if !token.Valid {
return nil, err
}
return claims, nil
}
// Common omit password field for users
func OmitPassword(db *gorm.DB) *gorm.DB {
return db.Omit("Password")
}
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