150 lines
3.6 KiB
Go
150 lines
3.6 KiB
Go
package auth
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import (
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"errors"
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"time"
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"github.com/gofiber/fiber/v3"
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"github.com/golang-jwt/jwt/v5"
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)
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type AuthService struct {
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cfg Config
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secret []byte
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accessExpiry time.Duration
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refreshExpiry time.Duration
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}
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const (
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tokenTypeAccess = "access"
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tokenTypeRefresh = "refresh"
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)
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func NewAuthService(cfg Config) (*AuthService, error) {
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if cfg.Secret == "" {
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return nil, errors.New("jwt secret is required")
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}
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if cfg.AccessTokenExpiry <= 0 {
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return nil, errors.New("access token expiry must be positive")
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}
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if cfg.RefreshTokenExpiry <= 0 {
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return nil, errors.New("refresh token expiry must be positive")
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}
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return &AuthService{
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cfg: cfg,
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secret: []byte(cfg.Secret),
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accessExpiry: cfg.AccessTokenExpiry,
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refreshExpiry: cfg.RefreshTokenExpiry,
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}, nil
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}
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func (s *AuthService) GenerateTokenPair(username string) (TokenPair, error) {
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access, err := s.generateToken(username, tokenTypeAccess, s.accessExpiry)
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if err != nil {
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return TokenPair{}, err
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}
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refresh, err := s.generateToken(username, tokenTypeRefresh, s.refreshExpiry)
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if err != nil {
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return TokenPair{}, err
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}
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return TokenPair{
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AccessToken: access,
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RefreshToken: refresh,
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}, nil
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}
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func (s *AuthService) AccessExpiry() time.Duration {
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return s.accessExpiry
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}
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func (s *AuthService) RefreshExpiry() time.Duration {
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return s.refreshExpiry
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}
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func (s *AuthService) Middleware() fiber.Handler {
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return func(c fiber.Ctx) error {
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tokenString := c.Get("Auth-Token")
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if tokenString == "" {
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return fiber.NewError(fiber.StatusUnauthorized, "missing token header")
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}
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claims, err := s.parseToken(tokenString)
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if err != nil {
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return fiber.NewError(fiber.StatusUnauthorized, err.Error())
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}
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if claims.TokenType != tokenTypeAccess {
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return fiber.NewError(fiber.StatusUnauthorized, "access token required")
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}
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c.Locals("authClaims", claims)
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return c.Next()
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}
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}
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func (s *AuthService) Refresh(refreshToken string) (TokenPair, error) {
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claims, err := s.parseToken(refreshToken)
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if err != nil {
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return TokenPair{}, err
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}
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if claims.TokenType != tokenTypeRefresh {
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return TokenPair{}, errors.New("refresh token required")
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}
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return s.GenerateTokenPair(claims.Username)
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}
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func (s *AuthService) ValidateAccessToken(tokenString string) (*Claims, error) {
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claims, err := s.parseToken(tokenString)
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if err != nil {
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return nil, err
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}
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if claims.TokenType != tokenTypeAccess {
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return nil, errors.New("access token required")
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}
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return claims, nil
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}
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func ClaimsFromCtx(c fiber.Ctx) (*Claims, bool) {
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val := c.Locals("authClaims")
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if val == nil {
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return nil, false
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}
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claims, ok := val.(*Claims)
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return claims, ok
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}
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func (s *AuthService) parseToken(tokenString string) (*Claims, error) {
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claims := &Claims{}
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token, err := jwt.ParseWithClaims(tokenString, claims, func(t *jwt.Token) (interface{}, error) {
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if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
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return nil, fiber.ErrUnauthorized
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}
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return s.secret, nil
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})
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if err != nil || !token.Valid {
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return nil, errors.New("invalid or expired token")
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}
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if s.cfg.Issuer != "" && claims.Issuer != "" && claims.Issuer != s.cfg.Issuer {
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return nil, errors.New("invalid token issuer")
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}
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return claims, nil
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}
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func (s *AuthService) generateToken(username, tokenType string, expiry time.Duration) (string, error) {
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claims := Claims{
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Username: username,
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TokenType: tokenType,
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RegisteredClaims: jwt.RegisteredClaims{
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Issuer: s.cfg.Issuer,
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ExpiresAt: jwt.NewNumericDate(time.Now().Add(expiry)),
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IssuedAt: jwt.NewNumericDate(time.Now()),
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},
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}
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token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
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return token.SignedString(s.secret)
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}
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