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jwt.go
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jwt.go
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package auth
import (
"fmt"
"github.com/dgrijalva/jwt-go"
"github.com/gusantoniassi/navegante/core/entity/user"
"log"
"os"
"time"
)
const tokenExpiryTime = time.Hour * 8
func getSecret() string {
var jwtSecret string
var ok bool
if jwtSecret, ok = os.LookupEnv("JWT_SECRET"); !ok {
log.Print("[WARN] No JWT_SECRET environment variable found. You should set it to a random value to improve JWT security")
jwtSecret = "Navegante is awesome, isn't it? You should really change this though"
}
return jwtSecret
}
func generateToken(claims jwt.MapClaims) (string, error) {
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
tokenString, err := token.SignedString([]byte(getSecret()))
return tokenString, err
}
func GenerateUserToken(user user.User) (string, error) {
claims := jwt.MapClaims{}
claims["user"] = user
claims["exp"] = time.Now().Add(tokenExpiryTime).Unix()
token, err := generateToken(claims)
return token, err
}
func validateTokenExpiry(claims jwt.MapClaims) error {
exp, ok := claims["exp"].(float64)
if !ok || int64(exp) < time.Now().Unix() {
return fmt.Errorf("expired token")
}
return nil
}
func getUserFromClaims(claims jwt.MapClaims) (*user.User, error) {
userMap, ok := claims["user"].(map[string]interface{})
if !ok {
return nil, fmt.Errorf("no user found in the token")
}
id, okId := userMap["ID"].(float64)
name, okName := userMap["Name"].(string)
email, okEmail := userMap["Email"].(string)
password, okPassword := userMap["Password"].(string)
if !(okId && okName && okEmail && okPassword) {
return nil, fmt.Errorf("error decoding user values from JWT")
}
usr := user.User{
ID: user.ID(id),
Name: name,
Email: email,
Password: password,
}
return &usr, nil
}
func DecodeUserToken(tokenString string) (*user.User, 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 []byte(getSecret()), nil
})
if err != nil {
return nil, err
}
if _, ok := token.Claims.(jwt.MapClaims); !ok && !token.Valid {
return nil, fmt.Errorf("invalid JWT token")
}
if err := token.Claims.Valid(); err != nil {
return nil, err
}
claims := token.Claims.(jwt.MapClaims)
err = validateTokenExpiry(claims)
if err != nil {
return nil, err
}
return getUserFromClaims(claims)
}