up

internal/services/team_service/service.go

@@ -166,3 +166,18 @@ func (s *TeamService) DownloadTeamQR(ctx context.Context, id int) ([]byte, strin
 	data, err := team_qr_pdf.Generate(cards)
 	return data, filename, err
 }
+
+// CheckPresence validates team credentials without loading game progress or a scenario.
+func (s *TeamService) CheckPresence(ctx context.Context, teamID int, password string) (int, error) {
+	team, err := s.teamsRepo.GetTeamByID(ctx, teamID)
+	if errors.Is(err, teams_repo.ErrTeamNotFound) {
+		return 0, ErrTeamNotFound
+	}
+	if err != nil {
+		return 0, err
+	}
+	if team.Password != password || team.ParticipationStatus == "cancelled" {
+		return 0, ErrTeamNotFound
+	}
+	return team.GameID, nil
+}