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https://github.com/truewhile/MeBox.git
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ShukeBta
385 lines
12 KiB
Go
385 lines
12 KiB
Go
// Package service — 双令牌认证服务。
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package service
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import (
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"context"
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"crypto/rand"
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"encoding/hex"
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"errors"
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"sync"
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"time"
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"github.com/golang-jwt/jwt/v5"
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"go.uber.org/zap"
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"github.com/ShukeBta/MediaStationGo/internal/config"
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"github.com/ShukeBta/MediaStationGo/internal/model"
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"github.com/ShukeBta/MediaStationGo/internal/repository"
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)
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const (
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// AccessTokenDuration Access Token 有效期（60分钟）
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AccessTokenDuration = 60 * time.Minute
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// RefreshTokenDuration Refresh Token 有效期（30天）
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RefreshTokenDuration = 30 * 24 * time.Hour
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// RefreshTokenLength Refresh Token 随机字节长度
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RefreshTokenLength = 32
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)
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const loginRefreshTokenStoreTimeout = 750 * time.Millisecond
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// Claims 是 JWT 载荷（复制自 middleware 以避免循环导入）。
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type Claims struct {
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UserID string `json:"uid"`
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Role string `json:"role"`
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Tier string `json:"tier,omitempty"`
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jwt.RegisteredClaims
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}
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// TokenService 处理双令牌认证（Access Token + Refresh Token）。
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type TokenService struct {
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cfg *config.Config
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log *zap.Logger
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repo *repository.Container
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delayedStoreMu sync.Mutex
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// delayedStores 记录「已发给客户端但还没写进库」的 refresh token。
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// 键是 token 哈希；值携带签发信息，让 Refresh 在落库完成前也能识别
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// 这些令牌——否则用户登录成功、一小时后 access token 过期，刷新时
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// 因为 refresh token 从未落库而被判定无效，被强制踢回登录页，
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// 表现就是「经常登录报错」。
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delayedStores map[string]pendingRefreshToken
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}
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type pendingRefreshToken struct {
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UserID string
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ExpiresAt time.Time
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}
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// NewTokenService 创建令牌服务实例。
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func NewTokenService(cfg *config.Config, log *zap.Logger, repo *repository.Container) *TokenService {
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return &TokenService{cfg: cfg, log: log, repo: repo, delayedStores: make(map[string]pendingRefreshToken)}
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}
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// TokenPair 包含访问令牌和刷新令牌。
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type TokenPair struct {
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AccessToken string `json:"access_token"`
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RefreshToken string `json:"refresh_token"`
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ExpiresIn int64 `json:"expires_in"` // 秒
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TokenType string `json:"token_type"`
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}
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// TokenService 错误定义。
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var (
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ErrInvalidRefreshToken = errors.New("invalid refresh token")
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ErrTokenExpired = errors.New("token expired")
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ErrTokenRevoked = errors.New("token revoked")
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)
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// IssuePair 为用户签发新的令牌对。
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func (s *TokenService) IssuePair(ctx context.Context, userID, role, tier string) (*TokenPair, error) {
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return s.issuePair(ctx, userID, role, tier, false)
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}
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// IssuePairBestEffort 为登录签发令牌。SQLite 被后台扫描长期写锁占用时，
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// 登录不能因为 refresh token 暂时无法落库而失败：先返回可用 access token，
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// 再在后台把 refresh token 补写进库。
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func (s *TokenService) IssuePairBestEffort(ctx context.Context, userID, role, tier string) (*TokenPair, error) {
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return s.issuePair(ctx, userID, role, tier, true)
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}
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func (s *TokenService) issuePair(ctx context.Context, userID, role, tier string, bestEffort bool) (*TokenPair, error) {
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// 生成 Access Token
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accessToken, err := s.issueAccessToken(userID, role, tier)
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if err != nil {
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return nil, err
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}
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// 生成 Refresh Token
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refreshToken, err := s.generateRefreshToken()
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if err != nil {
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return nil, err
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}
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// 存储 Refresh Token 哈希
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tokenHash := repository.HashToken(refreshToken)
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rt := &model.RefreshToken{
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UserID: userID,
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TokenHash: tokenHash,
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ExpiresAt: time.Now().Add(RefreshTokenDuration),
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}
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if bestEffort {
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s.storeRefreshTokenBestEffort(userID, tokenHash, rt.ExpiresAt)
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return &TokenPair{
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AccessToken: accessToken,
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RefreshToken: refreshToken,
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ExpiresIn: int64(AccessTokenDuration.Seconds()),
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TokenType: "Bearer",
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}, nil
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}
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if err := s.storeRefreshToken(ctx, rt); err != nil {
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return nil, err
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}
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return &TokenPair{
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AccessToken: accessToken,
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RefreshToken: refreshToken,
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ExpiresIn: int64(AccessTokenDuration.Seconds()),
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TokenType: "Bearer",
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}, nil
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}
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func (s *TokenService) storeRefreshTokenBestEffort(userID, tokenHash string, expiresAt time.Time) {
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if !s.trackDelayedStore(userID, tokenHash, expiresAt) {
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return
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}
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done := make(chan error, 1)
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go func() {
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ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
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defer cancel()
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done <- s.storeRefreshToken(ctx, &model.RefreshToken{
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UserID: userID,
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TokenHash: tokenHash,
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ExpiresAt: expiresAt,
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})
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}()
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select {
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case err := <-done:
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s.finishBestEffortRefreshTokenStore(userID, tokenHash, expiresAt, err)
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case <-time.After(loginRefreshTokenStoreTimeout):
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if s.log != nil {
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s.log.Warn("refresh token store delayed; login will continue",
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zap.String("user_id", userID),
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zap.Error(context.DeadlineExceeded))
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}
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go func() {
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err := <-done
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s.finishBestEffortRefreshTokenStore(userID, tokenHash, expiresAt, err)
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}()
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}
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}
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func (s *TokenService) finishBestEffortRefreshTokenStore(userID, tokenHash string, expiresAt time.Time, err error) {
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if err == nil {
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s.untrackDelayedStore(userID, tokenHash)
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return
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}
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if repository.IsSQLiteBusyError(err) || errors.Is(err, context.DeadlineExceeded) || errors.Is(err, context.Canceled) {
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if s.log != nil {
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s.log.Warn("refresh token store delayed; login will continue",
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zap.String("user_id", userID),
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zap.Error(err))
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}
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s.storeRefreshTokenEventually(userID, tokenHash, expiresAt)
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return
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}
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s.untrackDelayedStore(userID, tokenHash)
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if s.log != nil {
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s.log.Warn("refresh token delayed store failed permanently", zap.String("user_id", userID), zap.Error(err))
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}
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}
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func (s *TokenService) storeRefreshToken(ctx context.Context, rt *model.RefreshToken) error {
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if err := s.repo.RefreshToken.Create(ctx, rt); err != nil {
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return err
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}
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if err := s.repo.RefreshToken.RevokeOldestActiveByUserID(ctx, rt.UserID, s.maxActiveRefreshTokens(ctx)); err != nil && s.log != nil {
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s.log.Warn("failed to enforce refresh token session limit", zap.String("user_id", rt.UserID), zap.Error(err))
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}
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return nil
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}
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func (s *TokenService) storeRefreshTokenEventually(userID, tokenHash string, expiresAt time.Time) {
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defer s.untrackDelayedStore(userID, tokenHash)
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delay := time.Second
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for attempt := 1; attempt <= 8; attempt++ {
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timer := time.NewTimer(delay)
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<-timer.C
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// 令牌可能已在等待期间被轮换/登出（从 pending 表移除），
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// 此时绝不能再写库，否则会复活一个已被替换的旧令牌。
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if _, stillPending := s.pendingDelayedStore(tokenHash); !stillPending {
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return
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}
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ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
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err := s.storeRefreshToken(ctx, &model.RefreshToken{
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UserID: userID,
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TokenHash: tokenHash,
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ExpiresAt: expiresAt,
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})
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cancel()
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if err == nil {
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return
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}
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if !repository.IsSQLiteBusyError(err) && !errors.Is(err, context.DeadlineExceeded) && !errors.Is(err, context.Canceled) {
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if s.log != nil {
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s.log.Warn("refresh token delayed store failed permanently", zap.String("user_id", userID), zap.Error(err))
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}
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return
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}
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if s.log != nil && (attempt == 1 || attempt == 4 || attempt == 8) {
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s.log.Warn("refresh token delayed store still waiting",
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zap.String("user_id", userID),
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zap.Int("attempt", attempt),
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zap.Error(err))
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}
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if delay < 60*time.Second {
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delay *= 2
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}
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}
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if s.log != nil {
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s.log.Warn("refresh token delayed store gave up", zap.String("user_id", userID))
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}
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}
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func (s *TokenService) trackDelayedStore(userID, tokenHash string, expiresAt time.Time) bool {
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if s == nil {
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return false
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}
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s.delayedStoreMu.Lock()
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defer s.delayedStoreMu.Unlock()
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if s.delayedStores == nil {
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s.delayedStores = make(map[string]pendingRefreshToken)
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}
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if _, ok := s.delayedStores[tokenHash]; ok {
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return false
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}
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s.delayedStores[tokenHash] = pendingRefreshToken{UserID: userID, ExpiresAt: expiresAt}
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return true
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}
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func (s *TokenService) untrackDelayedStore(userID, tokenHash string) {
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if s == nil {
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return
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}
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s.delayedStoreMu.Lock()
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delete(s.delayedStores, tokenHash)
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s.delayedStoreMu.Unlock()
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}
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// pendingDelayedStore 返回尚未落库的 refresh token 信息（如果存在）。
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func (s *TokenService) pendingDelayedStore(tokenHash string) (pendingRefreshToken, bool) {
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if s == nil {
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return pendingRefreshToken{}, false
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}
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s.delayedStoreMu.Lock()
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defer s.delayedStoreMu.Unlock()
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pending, ok := s.delayedStores[tokenHash]
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return pending, ok
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}
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func (s *TokenService) maxActiveRefreshTokens(ctx context.Context) int {
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cfg := loadBotConfig(ctx, s.repo)
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if cfg.MaxLoggedClients < 1 {
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return defaultBotConfig().MaxLoggedClients
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}
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return cfg.MaxLoggedClients
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}
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// issueAccessToken 签发 JWT Access Token（HS256，60分钟有效期）。
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func (s *TokenService) issueAccessToken(userID, role, tier string) (string, error) {
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claims := Claims{
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UserID: userID,
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Role: role,
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Tier: tier,
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RegisteredClaims: jwt.RegisteredClaims{
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IssuedAt: jwt.NewNumericDate(time.Now()),
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ExpiresAt: jwt.NewNumericDate(time.Now().Add(AccessTokenDuration)),
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Issuer: "mediastationgo",
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Subject: userID,
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},
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}
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t := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
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return t.SignedString([]byte(s.cfg.Secrets.JWTSecret))
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}
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// generateRefreshToken 生成安全的随机 Refresh Token。
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func (s *TokenService) generateRefreshToken() (string, error) {
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buf := make([]byte, RefreshTokenLength)
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if _, err := rand.Read(buf); err != nil {
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return "", err
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}
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return hex.EncodeToString(buf), nil
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}
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// Refresh 使用 Refresh Token 轮换获取新的令牌对。
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func (s *TokenService) Refresh(ctx context.Context, refreshToken string) (*TokenPair, error) {
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tokenHash := repository.HashToken(refreshToken)
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// 查找 Refresh Token 记录
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rt, err := s.repo.RefreshToken.FindByHash(ctx, tokenHash)
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if err != nil {
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return nil, err
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}
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if rt == nil {
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// 登录高峰/扫描写压力下，refresh token 可能还在后台补写队列里
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// 没来得及落库。此时令牌对客户端而言是合法的，不能判无效。
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pending, ok := s.pendingDelayedStore(tokenHash)
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if !ok || time.Now().After(pending.ExpiresAt) {
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return nil, ErrInvalidRefreshToken
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}
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rt = &model.RefreshToken{
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UserID: pending.UserID,
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TokenHash: tokenHash,
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ExpiresAt: pending.ExpiresAt,
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}
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}
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// 检查是否已撤销
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if rt.Revoked {
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return nil, ErrTokenRevoked
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}
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// 检查是否过期
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if rt.IsExpired() {
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return nil, ErrTokenExpired
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}
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// 获取用户信息
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user, err := s.repo.User.FindByID(ctx, rt.UserID)
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if err != nil {
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return nil, err
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}
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if user == nil {
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return nil, ErrInvalidRefreshToken
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}
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if !user.IsActive {
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return nil, ErrUserInactive
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}
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if user.ExpiredAt != nil && time.Now().After(*user.ExpiredAt) {
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return nil, ErrUserExpired
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}
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// 撤销旧的 Refresh Token（包括可能仍在后台补写队列里的副本）。
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if err := s.repo.RefreshToken.Revoke(ctx, tokenHash); err != nil {
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s.log.Warn("failed to revoke old refresh token", zap.Error(err))
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}
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s.untrackDelayedStore(rt.UserID, tokenHash)
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// 签发新的令牌对
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return s.IssuePairBestEffort(ctx, user.ID, user.Role, user.Tier)
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}
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// RevokeAll 撤销用户的所有 Refresh Token（用于登出）。
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func (s *TokenService) RevokeAll(ctx context.Context, userID string) error {
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return s.repo.RefreshToken.RevokeByUserID(ctx, userID)
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}
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// ValidateAccessToken 验证 Access Token 并返回 Claims。
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func (s *TokenService) ValidateAccessToken(tokenString string) (*Claims, error) {
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claims := &Claims{}
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_, 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, errors.New("unexpected signing method")
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}
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return []byte(s.cfg.Secrets.JWTSecret), nil
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})
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if err != nil {
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return nil, err
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}
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return claims, nil
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}
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// CleanupExpired 清理过期的 Refresh Token。
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func (s *TokenService) CleanupExpired(ctx context.Context) error {
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return s.repo.RefreshToken.DeleteExpired(ctx)
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}
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