fix

internal/services/participation_service/service.go

@@ -30,11 +30,26 @@ func NewParticipationService(teamsRepo *teams_repo.TeamsRepo, appBaseURL string)
 
 func (s *ParticipationService) GetParticipation(ctx context.Context, token string) (*Participation, error) {
 	p, err := s.teamsRepo.GetParticipation(ctx, token)
-	return mapParticipation(p), err
+	return mapParticipation(p), mapParticipationError(err)
 }
 func (s *ParticipationService) AnswerParticipation(ctx context.Context, token, answer string) (*Participation, error) {
 	p, err := s.teamsRepo.AnswerParticipation(ctx, token, answer)
-	return mapParticipation(p), err
+	return mapParticipation(p), mapParticipationError(err)
+}
+
+func mapParticipationError(err error) error {
+	switch {
+	case errors.Is(err, teams_repo.ErrParticipationLink):
+		return ErrParticipationLink
+	case errors.Is(err, teams_repo.ErrParticipationClosed):
+		return ErrParticipationClosed
+	case errors.Is(err, teams_repo.ErrParticipationFinal):
+		return ErrParticipationFinal
+	case err != nil && err.Error() == ErrInvalidAnswer.Error():
+		return ErrInvalidAnswer
+	default:
+		return err
+	}
 }
 
 // Стабильные токены для разных целей сохраняют работоспособность ссылок при