ftp-srv-esm/src/commands/registration/opts.js

Modern, extensible FTP server (daemon) for Node.js with ESM support. Based on ftp-srv.

const OPTIONS = {
  UTF8: utf8,
  'UTF-8': utf8,
  LIST: listOpts
};

export default {
  directive: 'OPTS',
  handler: function ({command} = {}) {
    if (!command || !Object.prototype.hasOwnProperty.call(command, 'arg')) return this.reply(501);

    const [_option, ...args] = command.arg.split(' ');
    const option = _option ? _option.toUpperCase() : '';

    if (!Object.prototype.hasOwnProperty.call(OPTIONS, option)) return this.reply(501, 'Unknown option command');

    // For LIST options, we need to consider both args and flags
    if (option === 'LIST') {
      const allArgs = [...args, ...(command.flags || [])];
      return OPTIONS[option].call(this, allArgs);
    }

    return OPTIONS[option].call(this, args);
  },
  syntax: '{{cmd}}',
  description: 'Select options for a feature'
};

function utf8([setting] = []) {
  const getEncoding = () => {
    switch ((setting || '').toUpperCase()) {
      case 'ON': return 'utf8';
      case 'OFF': return 'ascii';
      default: return null;
    }
  };

  const encoding = getEncoding();
  if (!encoding) return this.reply(501, 'Unknown setting for option');

  this.encoding = encoding;

  return this.reply(200, `UTF8 encoding ${(setting || '').toLowerCase()}`);
}

function listOpts([setting] = []) {
  const option = (setting || '').toUpperCase();

  switch (option) {
    case '-E':
      // Enable EPLF (Extended Path Listing Format)
      this.listFormat = 'ep';
      return this.reply(200, 'EPLF format enabled');
    case '-L':
      // Enable standard Unix ls format (default)
      this.listFormat = 'ls';
      return this.reply(200, 'Standard format enabled');
    default:
      return this.reply(501, 'Unknown LIST option');
  }
}