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 * Licensed to the Apache Software Foundation (ASF) under one
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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
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package org.apache.sshd.common.file.virtualfs;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.sshd.common.Session;
import org.apache.sshd.common.file.FileSystemFactory;
import org.apache.sshd.common.file.FileSystemView;
import org.apache.sshd.common.file.nativefs.NativeFileSystemView;

 * SSHd file system factory to reduce the visibility to a physical folder.

public class VirtualFileSystemFactory implements FileSystemFactory {

    private String defaultHomeDir;
    private final Map<String, String> homeDirs = new ConcurrentHashMap<String, String>();

    public VirtualFileSystemFactory() {

    public VirtualFileSystemFactory(String defaultHomeDir) {
        this.defaultHomeDir = defaultHomeDir;

    public void setDefaultHomeDir(String defaultHomeDir) {
        this.defaultHomeDir = defaultHomeDir;

    public String getDefaultHomeDir() {
        return defaultHomeDir;

    public void setUserHomeDir(String userName, String userHomeDir) {
        homeDirs.put(userName, userHomeDir);

    public String getUserHomeDir(String userName) {
        return homeDirs.get(userName);

    protected String computeRootDir(String userName) {
        String homeDir = homeDirs.get(userName);
        if (homeDir == null) {
            homeDir = defaultHomeDir;
        if (homeDir == null) {
            throw new IllegalStateException("No home directory for user " + userName);
        return homeDir;

    public FileSystemView createFileSystemView(Session session) {
        String dir = computeRootDir(session.getUsername());
        Map<String, String> roots = new HashMap<String, String>();
        roots.put("/", dir);
        return new NativeFileSystemView(session.getUsername(), roots, "/", '/', false);