Share an Existing SSH Tunnel (Socket) with IMAP

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Demonstrates the Chilkat Imap.UseSshTunnel method, which uses an existing SSH tunnel, represented by a Socket object, for IMAP connections. The only argument is the Socket. Call it before Connect. This example opens and authenticates the tunnel on a Socket, then routes IMAP through it.

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the Imap.UseSshTunnel method, which uses an existing SSH tunnel (represented by
  // a Socket) for IMAP connections.  The only argument is the Socket.  Call it before Connect.

  final imap = CkImap();

  // Open and authenticate an SSH tunnel on a Socket object.  This tunnel can be shared with
  // other Chilkat objects.
  final sshTunnel = CkSocket();
  final sshPort = 22;
  try {
    sshTunnel.sshOpenTunnel('ssh.example.com', sshPort);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // The SSH password is not hard-coded in source.  Insert code here to obtain it from an
  // interactive prompt, environment variable, or a secrets vault.
  final sshPassword = '';

  try {
    sshTunnel.sshAuthenticatePw('sshUser', sshPassword);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Tell the Imap object to use the existing tunnel.
  try {
    imap.useSshTunnel(sshTunnel);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Now connect and log in to the IMAP server through the tunnel.
  imap.ssl = true;
  imap.port = 993;
  try {
    imap.connect('imap.example.com');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    imap.login('user@example.com', 'myPassword');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    imap.disconnect();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }
}