fix: map user on fetch messages

Author: gsanchietti

service/messages.go

@@ -116,7 +116,7 @@ func (s *MessageService) SendMessage(ctx context.Context, req *models.SendMessag
 // FetchMessages translates Matrix /sync into the Acrobits fetch_messages response.
 func (s *MessageService) FetchMessages(ctx context.Context, req *models.FetchMessagesRequest) (*models.FetchMessagesResponse, error) {
 	// The user to impersonate is taken from the 'Username' field.
-	userID := id.UserID(req.Username)
+	userID := s.resolveMatrixUser(strings.TrimSpace(req.Username))
 	if userID == "" {
 		logger.Warn().Msg("fetch messages: empty user ID")
 		return nil, ErrAuthentication