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token.go
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token.go
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package auth
import (
"fmt"
"time"
"github.com/dbeliakov/revisor/api/config"
"github.com/dbeliakov/revisor/api/store"
"github.com/dgrijalva/jwt-go"
"golang.org/x/xerrors"
)
var (
signingKey = []byte(config.SecretKey)
)
const (
firstNameKey = "first_name"
lastNameKey = "last_name"
loginKey = "login"
expiredTTL = 7 * 24 * time.Hour
)
// NewToken generates new JWT token for user
func newToken(user store.User) (string, error) {
token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
firstNameKey: user.FirstName,
lastNameKey: user.LastName,
loginKey: user.Login,
"exp": time.Now().Add(expiredTTL).Unix(),
})
tokenString, err := token.SignedString(signingKey)
if err != nil {
return "", err
}
return tokenString, nil
}
// ValidateToken from user
func 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 signingKey, nil
})
if err != nil {
return jwt.MapClaims{}, err
}
if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
return claims, nil
}
return jwt.MapClaims{}, xerrors.New("Token is not valid")
}
// UserFromToken builds user object using information in token claims
func userFromToken(claims jwt.MapClaims) store.User {
return store.User{
FirstName: claims[firstNameKey].(string),
LastName: claims[lastNameKey].(string),
Login: claims[loginKey].(string),
}
}