fix confirmed deployment risks

backend/internal/handler/admin/backup_handler.go

@@ -1,12 +1,23 @@
 package admin
 
 import (
+	"sync"
+	"time"
+
+	infraerrors "github.com/Wei-Shaw/sub2api/internal/pkg/errors"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/response"
 	"github.com/Wei-Shaw/sub2api/internal/server/middleware"
 	"github.com/Wei-Shaw/sub2api/internal/service"
 	"github.com/gin-gonic/gin"
 )
 
+const (
+	restorePasswordMaxFailures = 5
+	restorePasswordBlockWindow = 15 * time.Minute
+)
+
+var backupRestoreAttemptLimiter = newRestoreAttemptLimiter(restorePasswordMaxFailures, restorePasswordBlockWindow)
+
 type BackupHandler struct {
 	backupService *service.BackupService
 	userService   *service.UserService
@@ -165,6 +176,64 @@ type RestoreBackupRequest struct {
 	Password string `json:"password" binding:"required"`
 }
 
+type restoreAttemptState struct {
+	failuresUntil time.Time
+	failureCount  int
+}
+
+type restoreAttemptLimiter struct {
+	mu          sync.Mutex
+	maxFailures int
+	window      time.Duration
+	states      map[int64]restoreAttemptState
+}
+
+func newRestoreAttemptLimiter(maxFailures int, window time.Duration) *restoreAttemptLimiter {
+	return &restoreAttemptLimiter{
+		maxFailures: maxFailures,
+		window:      window,
+		states:      make(map[int64]restoreAttemptState),
+	}
+}
+
+func (l *restoreAttemptLimiter) allow(userID int64, now time.Time) (bool, time.Duration) {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+
+	state, ok := l.states[userID]
+	if !ok {
+		return true, 0
+	}
+	if now.After(state.failuresUntil) {
+		delete(l.states, userID)
+		return true, 0
+	}
+	if state.failureCount < l.maxFailures {
+		return true, 0
+	}
+	return false, state.failuresUntil.Sub(now)
+}
+
+func (l *restoreAttemptLimiter) recordFailure(userID int64, now time.Time) {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+
+	state := l.states[userID]
+	if now.After(state.failuresUntil) {
+		state = restoreAttemptState{}
+	}
+	state.failureCount++
+	state.failuresUntil = now.Add(l.window)
+	l.states[userID] = state
+}
+
+func (l *restoreAttemptLimiter) recordSuccess(userID int64) {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+
+	delete(l.states, userID)
+}
+
 func (h *BackupHandler) RestoreBackup(c *gin.Context) {
 	backupID := c.Param("id")
 	if backupID == "" {
@@ -185,6 +254,11 @@ func (h *BackupHandler) RestoreBackup(c *gin.Context) {
 		return
 	}
 
+	if allowed, _ := backupRestoreAttemptLimiter.allow(sub.UserID, time.Now()); !allowed {
+		response.ErrorFrom(c, infraerrors.TooManyRequests("RESTORE_PASSWORD_RATE_LIMITED", "too many failed password attempts, please try again later"))
+		return
+	}
+
 	// 获取管理员用户并验证密码
 	user, err := h.userService.GetByID(c.Request.Context(), sub.UserID)
 	if err != nil {
@@ -192,9 +266,11 @@ func (h *BackupHandler) RestoreBackup(c *gin.Context) {
 		return
 	}
 	if !user.CheckPassword(req.Password) {
+		backupRestoreAttemptLimiter.recordFailure(sub.UserID, time.Now())
 		response.BadRequest(c, "incorrect admin password")
 		return
 	}
+	backupRestoreAttemptLimiter.recordSuccess(sub.UserID)
 
 	record, err := h.backupService.StartRestore(c.Request.Context(), backupID)
 	if err != nil {