106 lines
2.6 KiB
Go
106 lines
2.6 KiB
Go
package jwt
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import (
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"errors"
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"time"
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"github.com/golang-jwt/jwt/v5"
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)
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var (
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ErrInvalidToken = errors.New("invalid token")
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ErrExpiredToken = errors.New("token has expired")
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)
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type Claims struct {
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UserID int32 `json:"user_id"`
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UserType string `json:"user_type"` // "user" or "admin"
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Username string `json:"username,omitempty"`
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jwt.RegisteredClaims
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}
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type JWTManager struct {
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secretKey []byte
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accessTokenTTL time.Duration
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refreshTokenTTL time.Duration
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}
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func NewJWTManager(secret string, accessTokenTTL, refreshTokenTTL time.Duration) *JWTManager {
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return &JWTManager{
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secretKey: []byte(secret),
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accessTokenTTL: accessTokenTTL,
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refreshTokenTTL: refreshTokenTTL,
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}
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}
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func (m *JWTManager) GenerateAccessToken(userID int32, userType string, username string) (string, error) {
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now := time.Now()
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claims := &Claims{
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UserID: userID,
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UserType: userType,
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Username: username,
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RegisteredClaims: jwt.RegisteredClaims{
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ExpiresAt: jwt.NewNumericDate(now.Add(m.accessTokenTTL)),
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IssuedAt: jwt.NewNumericDate(now),
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NotBefore: jwt.NewNumericDate(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(m.secretKey)
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}
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func (m *JWTManager) GenerateRefreshToken(userID int32, userType string) (string, error) {
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now := time.Now()
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claims := &Claims{
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UserID: userID,
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UserType: userType,
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RegisteredClaims: jwt.RegisteredClaims{
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ExpiresAt: jwt.NewNumericDate(now.Add(m.refreshTokenTTL)),
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IssuedAt: jwt.NewNumericDate(now),
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NotBefore: jwt.NewNumericDate(now),
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Subject: "refresh",
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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(m.secretKey)
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}
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func (m *JWTManager) ValidateToken(tokenString string) (*Claims, error) {
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token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(token *jwt.Token) (interface{}, error) {
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if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
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return nil, ErrInvalidToken
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}
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return m.secretKey, nil
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})
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if err != nil {
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if errors.Is(err, jwt.ErrTokenExpired) {
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return nil, ErrExpiredToken
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}
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return nil, ErrInvalidToken
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}
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claims, ok := token.Claims.(*Claims)
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if !ok || !token.Valid {
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return nil, ErrInvalidToken
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}
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return claims, nil
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}
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func (m *JWTManager) RefreshAccessToken(refreshToken string) (string, error) {
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claims, err := m.ValidateToken(refreshToken)
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if err != nil {
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return "", err
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}
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// Only refresh tokens with subject "refresh" can be used
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if claims.Subject != "refresh" {
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return "", ErrInvalidToken
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}
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return m.GenerateAccessToken(claims.UserID, claims.UserType, claims.Username)
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}
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