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interactor.go
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interactor.go
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package jwt
import (
"net/http"
"strings"
"time"
"github.com/dgrijalva/jwt-go"
"github.com/dmitrymomot/go-errors"
"github.com/dmitrymomot/go-jwt/blacklist"
"github.com/dmitrymomot/go-utilities/uuid"
)
type (
// Interactor interface
Interactor interface {
New(uid, aid, role string) (string, error)
NewWithClaims(Claims) (string, error)
Parse(token string, claims Claims) error
ParseFromRequest(r *http.Request, claims Claims) error
ParseExpired(tokenString string, claims Claims) error
GetTokenStringFromRequest(r *http.Request) (string, error)
Revoke(tokenID string) error
IsRevoked(tokenID string) bool
RefreshToken(claims Claims) (string, error)
RefreshTokenFromString(tokenString string) (string, error)
}
interactor struct {
signingKey []byte
ttl int64
refreshTTL int64
bl blacklist.Blacklist
}
)
// NewInteractor factory
func NewInteractor(signingKey string, ttl, refreshTTL int64, bl blacklist.Blacklist) (Interactor, error) {
if bl == nil {
return nil, ErrBlacklistNotSpecified
}
return &interactor{[]byte(signingKey), ttl, refreshTTL, bl}, nil
}
func (i *interactor) New(uid, aid, role string) (string, error) {
claims := DefaultClaims{
uid, aid, role,
jwt.StandardClaims{
Id: uuid.New().String(),
ExpiresAt: time.Now().Add(time.Duration(i.ttl) * time.Second).Unix(),
IssuedAt: time.Now().Unix(),
},
}
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
return token.SignedString(i.signingKey)
}
func (i *interactor) NewWithClaims(cl Claims) (string, error) {
token := jwt.NewWithClaims(jwt.SigningMethodHS256, cl)
return token.SignedString(i.signingKey)
}
func (i *interactor) Parse(tokenString string, claims Claims) error {
t, err := jwt.ParseWithClaims(tokenString, claims, func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, ErrUnexpectedSigningMethod
}
return i.signingKey, nil
})
if err != nil {
if ve, ok := err.(*jwt.ValidationError); ok {
switch {
case ve.Errors&jwt.ValidationErrorMalformed != 0:
return ErrTokenMalformed
case ve.Errors&jwt.ValidationErrorExpired != 0:
return ErrTokenExpired
case ve.Errors&jwt.ValidationErrorNotValidYet != 0:
return ErrTokenNotValidYet
default:
return errors.Wrap(err, "could not handle this token")
}
} else {
return errors.Wrap(err, "could not handle this token")
}
}
if claims, ok := t.Claims.(Claims); ok && t.Valid {
if i.IsRevoked(claims.ID()) {
return ErrTokenRevoked
}
return nil
}
return errors.New("could not handle the token payload")
}
func (i *interactor) ParseExpired(tokenString string, claims Claims) error {
t, err := jwt.ParseWithClaims(tokenString, claims, func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, ErrUnexpectedSigningMethod
}
return i.signingKey, nil
})
if err != nil {
if ve, ok := err.(*jwt.ValidationError); ok {
switch {
case ve.Errors&jwt.ValidationErrorMalformed != 0:
return ErrTokenMalformed
case ve.Errors&jwt.ValidationErrorNotValidYet != 0:
return ErrTokenNotValidYet
default:
return errors.Wrap(err, "could not handle this token")
}
} else {
return errors.Wrap(err, "could not handle this token")
}
}
if claims, ok := t.Claims.(Claims); ok {
if i.IsRevoked(claims.ID()) {
return ErrTokenRevoked
}
return nil
}
return errors.New("could not handle the token payload")
}
func (i *interactor) ParseFromRequest(r *http.Request, claims Claims) error {
tokenString, err := i.GetTokenStringFromRequest(r)
if err != nil {
return err
}
return i.Parse(tokenString, claims)
}
func (i *interactor) GetTokenStringFromRequest(r *http.Request) (string, error) {
authHeader := r.Header.Get("Authorization")
if authHeader == "" {
return "", ErrAuthTokenMissed
}
if !strings.HasPrefix(authHeader, "Bearer") {
return "", ErrTokenMalformed
}
tokenString := strings.Trim(strings.TrimPrefix(authHeader, "Bearer"), " ")
return tokenString, nil
}
func (i *interactor) Revoke(tokenID string) error {
return i.bl.Add(tokenID)
}
func (i *interactor) IsRevoked(tokenID string) bool {
return i.bl.Exists(tokenID)
}
func (i *interactor) RefreshToken(claims Claims) (string, error) {
oldID := claims.ID()
cl := claims.Refresh(i.ttl)
if time.Unix(cl.ExpAt(), 0).Add(time.Duration(i.refreshTTL) * time.Second).Before(time.Now()) {
return "", ErrCouldNotRefresh
}
if err := i.bl.Add(oldID); err != nil {
return "", err
}
return i.NewWithClaims(cl)
}
func (i *interactor) RefreshTokenFromString(tokenString string) (string, error) {
cl := new(DefaultClaims)
if err := i.ParseExpired(tokenString, cl); err != nil {
return "", err
}
if time.Unix(cl.ExpiresAt, 0).Add(time.Duration(i.refreshTTL) * time.Second).Before(time.Now()) {
return "", ErrCouldNotRefresh
}
return i.NewWithClaims(cl)
}