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auth.go
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auth.go
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package authenticator
import (
"errors"
"fmt"
"log"
"time"
"github.com/irahardianto/monorepo-microservices/auth/usecase/storage"
jwt "github.com/dgrijalva/jwt-go"
"github.com/irahardianto/monorepo-microservices/auth/model"
"github.com/irahardianto/monorepo-microservices/package/hasher"
)
const (
authExpTime = 10 * time.Second
refreshTokenExpTIme = 72 * time.Hour
)
type Authenticator struct {
authStorage storage.UserInteractor
}
func NewAuthenticator(authStorage storage.UserInteractor, key []byte) *Authenticator {
return &Authenticator{
authStorage: authStorage,
}
}
// CreateNewToken generate new token with JWT using HS256 method
// return token and error
func (auth *Authenticator) CreateNewToken(uuid, username string, key []byte) (model.Token, error) {
var token model.Token
var err error
token.CSRFKey, err = GenerateRandomString(32)
if err != nil {
return token, err
}
subject := fmt.Sprintf("%s-%s", uuid, username)
authSubject := hasher.SHA256(subject)
token.AuthToken, err = auth.generateAuthToken(authSubject, token.CSRFKey, key)
if err != nil {
return token, err
}
token.RefreshToken, err = auth.generateRefreshToken(authSubject, uuid, token.CSRFKey, key)
if err != nil {
return token, err
}
return token, nil
}
// GenerateAuthToken generate auth token with HS256 methos
// included standard claim
// subject is combination from UUID and username with hash
func (auth *Authenticator) generateAuthToken(subject, csrfSecret string, key []byte) (string, error) {
authTokenExp := time.Now().Add(authExpTime).Unix()
authClaim := model.TokenClaim{
jwt.StandardClaims{
Subject: subject,
ExpiresAt: authTokenExp,
},
csrfSecret,
}
authJwt := jwt.NewWithClaims(jwt.GetSigningMethod("HS256"), authClaim)
return authJwt.SignedString(key)
}
func (auth *Authenticator) generateRefreshToken(tokenID, subject, csrfSecret string, key []byte) (string, error) {
authTokenExp := time.Now().Add(refreshTokenExpTIme).Unix()
auth.authStorage.StoreRefreshToken(model.RefreshToken{Token: tokenID})
refreshClaims := model.TokenClaim{
jwt.StandardClaims{
Id: tokenID,
Subject: subject,
ExpiresAt: authTokenExp,
},
csrfSecret,
}
// create a signer for rsa 256
refreshJwt := jwt.NewWithClaims(jwt.GetSigningMethod("HS256"), refreshClaims)
// generate the refresh token string
return refreshJwt.SignedString(key)
}
func (auth *Authenticator) getTokenWithClaim(token string, key []byte) (*jwt.Token, *model.TokenClaim, error) {
refreshToken, err := jwt.ParseWithClaims(token, &model.TokenClaim{}, func(token *jwt.Token) (interface{}, error) {
return key, nil
})
tokenClaim, ok := refreshToken.Claims.(*model.TokenClaim)
if !ok {
return nil, nil, err
}
return refreshToken, tokenClaim, err
}
func (auth *Authenticator) updateRefreshToken(oldRefreshToken string, key []byte) (newRefreshToken string, err error) {
_, oldRefreshTokenClaims, err := auth.getTokenWithClaim(oldRefreshToken, key)
refreshTokenExp := time.Now().Add(refreshTokenExpTIme).Unix()
refreshClaims := model.TokenClaim{
jwt.StandardClaims{
Id: oldRefreshTokenClaims.StandardClaims.Id, // jti
Subject: oldRefreshTokenClaims.StandardClaims.Subject,
ExpiresAt: refreshTokenExp,
},
oldRefreshTokenClaims.Csrf,
}
// create a signer for rsa 256
refreshJwt := jwt.NewWithClaims(jwt.GetSigningMethod("HS256"), refreshClaims)
// generate the refresh token string
return refreshJwt.SignedString(key)
}
func (auth *Authenticator) updateAuthToken(rawRefreshToken, rawAuthToken string, key []byte) (model.Token, error) {
var newToken model.Token
refreshToken, refreshTokenClaims, err := auth.getTokenWithClaim(rawRefreshToken, key)
storedToken, err := auth.authStorage.GetRefreshToken(refreshTokenClaims.StandardClaims.Id)
if err != nil {
return newToken, err
}
if storedToken.ID != "" {
if refreshToken.Valid {
_, authTokenClaim, _ := auth.getTokenWithClaim(rawAuthToken, key)
newToken.CSRFKey, err = GenerateRandomString(32)
if err != nil {
return newToken, err
}
newToken.AuthToken, err = auth.generateAuthToken(authTokenClaim.StandardClaims.Subject, newToken.CSRFKey, key)
return newToken, err
}
// the refresh token has expired!
// Revoke the token in our db and require the user to login again
log.Println("Refresh token has expired!")
auth.authStorage.DeleteRefreshToken(refreshTokenClaims.StandardClaims.Id)
err = errors.New("Unauthorized")
return newToken, err
}
log.Println("Refresh token has been revoked!")
err = errors.New("Unauthorized")
return newToken, err
}
func (auth *Authenticator) updateRefreshTokenCsrf(oldRefreshTokenString string, newCsrfString string, key []byte) (string, error) {
_, oldRefreshTokenClaims, err := auth.getTokenWithClaim(oldRefreshTokenString, key)
if err != nil {
return "", err
}
refreshClaims := model.TokenClaim{
jwt.StandardClaims{
Id: oldRefreshTokenClaims.StandardClaims.Id, // jti
Subject: oldRefreshTokenClaims.StandardClaims.Subject,
ExpiresAt: oldRefreshTokenClaims.StandardClaims.ExpiresAt,
},
newCsrfString,
}
// create a signer for rsa 256
refreshJwt := jwt.NewWithClaims(jwt.GetSigningMethod("HS256"), refreshClaims)
// generate the refresh token string
return refreshJwt.SignedString(key)
}
// AuthenticateToken check token and return new token
func (auth *Authenticator) AuthenticateToken(authToken, refreshToken, csrfToken string, key []byte) (model.Token, error) {
var token model.Token
tokenWithClaim, authTokenClaims, err := auth.getTokenWithClaim(authToken, key)
if csrfToken != authTokenClaims.Csrf {
log.Println("CSRF token doesn't match jwt!")
return token, errors.New("Unauthorized")
}
if tokenWithClaim.Valid {
token.CSRFKey = authTokenClaims.Csrf
token.AuthToken = authToken
token.RefreshToken, err = auth.updateRefreshToken(refreshToken, key)
return token, err
} else if ve, ok := err.(*jwt.ValidationError); ok {
if ve.Errors&(jwt.ValidationErrorExpired) != 0 {
token, err = auth.updateAuthToken(refreshToken, authToken, key)
if err != nil {
return token, err
}
// update the exp of refresh token string
token.RefreshToken, err = auth.updateRefreshToken(refreshToken, key)
if err != nil {
return token, err
}
// update the csrf string of the refresh token
token.RefreshToken, err = auth.updateRefreshTokenCsrf(token.RefreshToken, token.CSRFKey, key)
return token, err
}
log.Println("Error in auth token")
return token, errors.New("Error in auth token")
} else {
return token, errors.New("Error in auth token")
}
}
// RevokeRefreshToken remove refresh token from storage
func (auth *Authenticator) RevokeRefreshToken(refreshToken string) error {
return auth.authStorage.DeleteRefreshToken(refreshToken)
}