Dart

Get a Remote File's Owner

Demonstrates the Chilkat SFtp.GetFileOwner method, which returns a remote file's owner. The arguments are the remote path (or handle), whether symbolic links are followed, and whether the first argument is a handle.

Background: Ownership determines who may read, write, or change a file under Unix permission rules, so reading the owner is useful for auditing or for deciding whether an operation will be allowed. Note that a server may report the owner as a numeric UID rather than a name if it cannot resolve the account, and that ownership is a Unix concept — servers on other platforms may return an empty or synthetic value.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the SFtp.GetFileOwner method, which returns a remote file's owner.  The 1st
  // argument is the remote path (or handle), the 2nd selects whether symbolic links are followed,
  // and the 3rd indicates whether the 1st argument is a handle.

  final sftp = CkSFtp();

  // Connect, authenticate, and initialize the SFTP subsystem.
  final port = 22;
  try {
    sftp.connect('sftp.example.com', port);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Normally you would not hard-code the password in source.  You should instead obtain it
  // from an interactive prompt, environment variable, or a secrets vault.
  final password = 'mySshPassword';

  try {
    sftp.authenticatePw('mySshLogin', password);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    sftp.initializeSftp();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // The 2nd argument (bFollowLinks) selects whether a symbolic link is followed to its target.
  // The 3rd argument (bIsHandle) is false here because the 1st argument is a path, not an
  // open handle.
  final bFollowLinks = true;
  final bIsHandle = false;

  final String owner;
  try {
    owner = sftp.getFileOwner('subdir/report.pdf', bFollowLinks, bIsHandle);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Owner: $owner');

  sftp.disconnect();
}