如何使用Apache MINA SSHD阻止SFTP删除操作

Question

我试图使用Apache Mina sshd创建一个自定义sftp服务器。到目前为止我的代码：

 SshServer sshd = SshServer.setUpDefaultServer();
        sshd.setPort(PORT_NUMBER);
        sshd.setKeyPairProvider(new SimpleGeneratorHostKeyProvider(Paths.get("keys/private_key.ppk")));

        SftpSubsystemFactory factory = new SftpSubsystemFactory.Builder()
                .build();


        factory.addSftpEventListener(new BasicSftpEventListener());

        sshd.setSubsystemFactories(Collections.singletonList(factory));
        sshd.setShellFactory(new ProcessShellFactory("/bin/sh", "-i", "-l"));
        sshd.start();

如您所见，我实现了自己的SFTPEventListener：

public class BasicSftpEventListener implements SftpEventListener {

    @Override
    public void removing(ServerSession session, Path path) throws IOException {
        System.out.println("Removin");
    }

    @Override
    public void removed(ServerSession session, Path path, Throwable thrown) throws IOException {
        System.out.println("removed");
    }

多谢帮忙！

Answer 1

如果要阻止delete操作，则需要中断removere方法的异常流。这将告诉Mina停止并不删除文件。我建议使用java.lang.UnsupportedOperationException:

@Override
public void removing(ServerSession session, Path path) throws UnsupportedOperationException{
    throw new UnsupportedActionException("Removing files is not permitted.");
}