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manager.go
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/
manager.go
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package session
import (
"encoding/json"
"net/http"
"time"
"github.com/dgrijalva/jwt-go"
"github.com/mdouchement/middlewarex"
"github.com/cherya/standardfile/internal/database"
"github.com/cherya/standardfile/internal/model"
"github.com/cherya/standardfile/internal/sferror"
"github.com/o1egl/paseto/v2"
"github.com/pkg/errors"
)
// Defines token types.
const (
TypeAccessToken = "access_token"
TypeRefreshToken = "refresh_token"
)
type (
// A Manager manages sessions.
Manager interface {
JWTSigningKey() []byte
SessionSecret() []byte
// Token generates the session's token for the given type t.
Token(session *model.Session, t string) (string, error)
// ParseToken parses the given raw token and returns the session_id and token.
ParseToken(token string) (string, string, error)
// Generate creates a new session without user information.
Generate() *model.Session
// Validate validates an access token.
Validate(userID, token string) (*model.Session, error)
// AccessTokenExprireAt returns the expiration date of the access token.
AccessTokenExprireAt(session *model.Session) time.Time
// Regenerate regenerates the session's tokens.
Regenerate(session *model.Session) error
// UserFromToken the user for the given token.
UserFromToken(token interface{}) (*model.User, error)
}
manager struct {
db database.Client
// JWT params
signingKey []byte
// Session params
sessionSecret []byte
accessTokenExpirationTime time.Duration
refreshTokenExpirationTime time.Duration
}
)
// NewManager returns a new manager.
func NewManager(db database.Client, signingKey, sessionSecret []byte, accessTokenExpirationTime, refreshTokenExpirationTime time.Duration) Manager {
return &manager{
db: db,
signingKey: signingKey,
sessionSecret: sessionSecret,
accessTokenExpirationTime: accessTokenExpirationTime,
refreshTokenExpirationTime: refreshTokenExpirationTime,
}
}
func (m *manager) JWTSigningKey() []byte {
return m.signingKey
}
func (m *manager) SessionSecret() []byte {
return m.sessionSecret
}
func (m *manager) Token(session *model.Session, t string) (string, error) {
iat := session.ExpireAt.Add(-m.refreshTokenExpirationTime)
claims := &paseto.JSONToken{
Issuer: "standardfile",
Audience: t,
Subject: session.ID,
IssuedAt: iat.UTC(),
NotBefore: iat.UTC(),
Expiration: time.Now().Add(-72 * time.Hour).UTC(),
}
switch t {
case TypeAccessToken:
claims.Jti = session.AccessToken
claims.Expiration = m.AccessTokenExprireAt(session)
case TypeRefreshToken:
claims.Jti = session.RefreshToken
claims.Expiration = session.ExpireAt
}
return paseto.Encrypt(m.sessionSecret, claims, []byte{})
}
func (m *manager) ParseToken(token string) (string, string, error) {
var tk middlewarex.Token
err := paseto.Decrypt(token, m.sessionSecret, &tk.JSONToken, &tk.Footer)
return tk.Subject, tk.Jti, err
}
func (m *manager) Generate() *model.Session {
return &model.Session{
ExpireAt: time.Now().Add(m.refreshTokenExpirationTime).UTC(),
AccessToken: SecureToken(8),
RefreshToken: SecureToken(8),
}
}
func (m *manager) Validate(id, token string) (*model.Session, error) {
// Check if there is an active session.
session, err := m.db.FindSessionByAccessToken(id, token)
if err != nil {
if m.db.IsNotFound(err) {
return nil, sferror.NewWithTagCode(
http.StatusUnauthorized,
"invalid-auth",
"Invalid login credentials.",
)
}
return nil, errors.Wrap(err, "could not get access to database")
}
// Validate session.
if m.isSessionExpired(session) {
return nil, sferror.NewWithTagCode(http.StatusUnauthorized, "invalid-auth", "Invalid login credentials.")
}
if m.isAccessTokenExpired(session) {
return nil, sferror.NewWithTagCode(sferror.StatusExpiredAccessToken, "expired-access-token", "The provided access token has expired.")
}
return session, nil
}
func (m *manager) AccessTokenExprireAt(session *model.Session) time.Time {
return session.ExpireAt.Add(-m.refreshTokenExpirationTime).Add(m.accessTokenExpirationTime)
}
func (m *manager) Regenerate(session *model.Session) error {
if m.isSessionExpired(session) {
return sferror.NewWithTagCode(
http.StatusBadRequest,
"expired-refresh-token",
"The refresh token has expired.",
)
}
session.AccessToken = SecureToken(8)
session.RefreshToken = SecureToken(8)
session.ExpireAt = time.Now().Add(m.refreshTokenExpirationTime)
return errors.Wrap(m.db.Save(session), "could not save session after refreshing session")
}
func (m *manager) UserFromToken(token interface{}) (*model.User, error) {
if jwt, ok := token.(*jwt.Token); ok {
return m.JWT(jwt)
}
return m.Paseto(token.(middlewarex.Token))
}
func (m *manager) Paseto(token middlewarex.Token) (*model.User, error) {
session, err := m.Validate(token.Subject, token.Jti)
if err != nil {
return nil, err
}
// Get current_user.
user, err := m.db.FindUser(session.UserID)
if err != nil {
if m.db.IsNotFound(err) {
return nil, sferror.NewWithTagCode(
http.StatusUnauthorized,
"invalid-auth",
"Invalid login credentials.",
)
}
return nil, errors.Wrap(err, "could not get access to database")
}
return user, nil
}
func (m *manager) JWT(token *jwt.Token) (*model.User, error) {
claims, ok := token.Claims.(jwt.MapClaims)
if !ok {
panic("token implementation has wrong type of claims")
}
// Get current_user.
user, err := m.db.FindUser(claims["user_uuid"].(string))
if err != nil {
if m.db.IsNotFound(err) {
return nil, sferror.NewWithTagCode(
http.StatusUnauthorized,
"invalid-auth",
"Invalid login credentials.",
)
}
return nil, errors.Wrap(err, "could not get access to database")
}
// Check if password has changed since token was generated.
var iat int64
switch v := claims["iat"].(type) {
case float64:
iat = int64(v)
case json.Number:
iat, _ = v.Int64()
default:
panic("unsuported iat underlying type")
}
if iat < user.PasswordUpdatedAt {
return nil, sferror.NewWithTagCode(http.StatusUnauthorized, "invalid-auth", "Revoked token.")
}
return user, nil
}
func (m *manager) isSessionExpired(session *model.Session) bool {
return session.ExpireAt.Before(time.Now())
}
func (m *manager) isAccessTokenExpired(session *model.Session) bool {
return m.AccessTokenExprireAt(session).Before(time.Now())
}