124 lines
4.0 KiB
Go
124 lines
4.0 KiB
Go
package service
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import (
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"log"
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"time"
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"metazone.cc/metalab/internal/common"
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"metazone.cc/metalab/internal/config"
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"metazone.cc/metalab/internal/model"
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"metazone.cc/metalab/internal/repository"
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"github.com/golang-jwt/jwt/v5"
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)
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// TokenService JWT 令牌签发与刷新
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// 独立于认证业务逻辑，供 AuthService 和其他需要签发令牌的服务使用
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type TokenService struct {
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cfg *config.Config
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userRepo *repository.UserRepo
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}
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// NewTokenService 构造函数
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func NewTokenService(cfg *config.Config, userRepo *repository.UserRepo) *TokenService {
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return &TokenService{cfg: cfg, userRepo: userRepo}
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}
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// BuildAccessToken 构建 access JWT（含 uid/email/username/role/ver/exp/iat）
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// ver = user.TokenVersion，用于即时吊销：版本号不匹配则拒绝
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func (ts *TokenService) BuildAccessToken(user *model.User) (string, error) {
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expire := time.Duration(ts.cfg.JWT.AccessExpire) * time.Minute
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now := time.Now()
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expAt := now.Add(expire)
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log.Printf("[BuildAccessToken] AccessExpire=%d min → expire=%v | now=%v | exp=%v (%d) | iat=%d ver=%d",
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ts.cfg.JWT.AccessExpire, expire, now, expAt, expAt.Unix(), now.Unix(), user.TokenVersion)
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claims := jwt.MapClaims{
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"uid": user.ID,
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"email": user.Email,
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"username": user.Username,
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"role": user.Role,
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"ver": user.TokenVersion,
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"exp": expAt.Unix(),
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"iat": now.Unix(),
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}
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token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
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return token.SignedString([]byte(ts.cfg.JWT.Secret))
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}
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// BuildRefreshToken 构建 refresh JWT（含 purpose:"refresh" 防止 access 冒充）
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// rememberMe=true → 使用 remember_expire（30天）；false → 使用 refresh_expire（7天，session 模式）
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// ver = user.TokenVersion，刷新时校验：版本号不匹配则拒绝
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func (ts *TokenService) BuildRefreshToken(user *model.User, rememberMe bool) (string, error) {
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var expireHours int
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if rememberMe {
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expireHours = ts.cfg.JWT.RememberExpire
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} else {
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expireHours = ts.cfg.JWT.RefreshExpire
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}
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expire := time.Duration(expireHours) * time.Hour
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now := time.Now()
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claims := jwt.MapClaims{
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"uid": user.ID,
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"email": user.Email,
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"username": user.Username,
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"role": user.Role,
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"ver": user.TokenVersion,
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"exp": now.Add(expire).Unix(),
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"iat": now.Unix(),
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"purpose": "refresh",
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}
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token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
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return token.SignedString([]byte(ts.cfg.JWT.Secret))
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}
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// RefreshAccessToken 用 refresh token 换取新的 access token
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// 校验 token_version：若 DB 中版本已递增，拒绝刷新 → 即时吊销
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func (ts *TokenService) RefreshAccessToken(refreshTokenStr string) (string, *model.User, error) {
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if refreshTokenStr == "" {
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return "", nil, ErrTokenInvalid
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}
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token, err := jwt.Parse(refreshTokenStr, func(t *jwt.Token) (interface{}, error) {
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return []byte(ts.cfg.JWT.Secret), nil
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})
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if err != nil || !token.Valid {
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return "", nil, ErrTokenExpired
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}
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claims, ok := token.Claims.(jwt.MapClaims)
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if !ok {
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return "", nil, ErrTokenInvalid
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}
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// 只接受 refresh 用途的 token，防止 access token 被用于刷新
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if purpose, _ := claims["purpose"].(string); purpose != "refresh" {
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return "", nil, ErrTokenInvalid
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}
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uid := uint(claims["uid"].(float64))
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tokenVer := int(claims["ver"].(float64))
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// 即时吊销检查 + 获取最新用户数据（角色/状态可能在 JWT 签发后已变更）
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// 用 FindByIDForAuth 而非从 claims 重建，确保 access token 承载最新数据
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user, err := ts.userRepo.FindByIDForAuth(uid)
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if err != nil {
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return "", nil, common.ErrTokenRevoked
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}
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if tokenVer != user.TokenVersion {
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log.Printf("[RefreshAccessToken] REVOKED: uid=%d tokenVer=%d dbVer=%d", uid, tokenVer, user.TokenVersion)
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return "", nil, common.ErrTokenRevoked
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}
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// 防止封禁用户通过 refresh 续期
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if user.Status == model.StatusBanned {
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return "", nil, common.ErrUserBanned
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}
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accessToken, err := ts.BuildAccessToken(user)
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if err != nil {
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return "", nil, err
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}
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return accessToken, user, nil
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}
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