private void userCommandHandler(String input){
        if(input.isEmpty())
            return;
        String args[] = input.split(" ");
        if(args[0].equals("import")){
            if(args.length != 3){
                return;
            }
            String localPath = args[1];
            String whfsPath = args[2];

            importHandler(localPath, whfsPath);
        } else if (args[0].equals("listfile")){
            for(String file : whfsFiles){
                System.out.println(file);
            }
        } else if (args[0].equals("listnode")){
            for(String node : dataNodeList){
                System.out.println(node);
            }
        } else if (args[0].equals("replica")){
            System.out.println(blockToNode.toString());
        } else if (args[0].equals("nodes")){
            System.out.println(nodeBlocks.toString());
        }
    }