/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You under the Apache License, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License.  You may obtain a copy of the License at
    *
    *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.commons.vfs2.libcheck;
  
  import java.util.Properties;
  import java.util.Vector;
  
  import com.jcraft.jsch.ChannelSftp;
  import com.jcraft.jsch.JSch;
  import com.jcraft.jsch.Session;
  import com.jcraft.jsch.UserInfo;
  
  /**
   * Basic check for SFTP.
   */
  public final class SftpCheck {
  
      private static final int ARG_COUNT = 4;
  
      /**
       * Invokes this example from the command line.
       *
       * @param args Arguments TODO
       * @throws Exception If anything goes wrong.
       */
      public static void main(final String[] args) throws Exception {
          if (args.length != ARG_COUNT) {
              throw new IllegalArgumentException("Usage: SftpCheck user pass host dir");
          }
          final String user = args[0];
          final String pass = args[1];
          final String host = args[2];
          final String dir = args[3];
  
          final Properties props = new Properties();
          props.setProperty("StrictHostKeyChecking", "false");
          final JSch jsch = new JSch();
          final Session session = jsch.getSession(user, host, 22);
          session.setUserInfo(new UserInfo() {
              @Override
              public String getPassphrase() {
                  return null;
              }
  
              @Override
              public String getPassword() {
                  return null;
              }
  
              @Override
              public boolean promptPassphrase(final String string) {
                  return false;
              }
  
              @Override
              public boolean promptPassword(final String string) {
                  return false;
              }
  
              @Override
              public boolean promptYesNo(final String string) {
                  return true;
              }
  
              @Override
              public void showMessage(final String string) {
              }
          });
          session.setPassword(pass);
          session.connect();
          final ChannelSftp chan = (ChannelSftp) session.openChannel("sftp");
          chan.connect();
          final Vector<?> list = chan.ls(dir);
          list.forEach(System.err::println);
          System.err.println("done");
          chan.disconnect();
          session.disconnect();
      }
  
      private SftpCheck() {
          /* main class not instantiated. */
      }
  }