(C#) AWS Transfer for SFTP (Amazon S3)

Once you've setup your AWS Transfer for SFTP in the AWS Console, interacting with it is no different than any other SSH/SFTP server. AWS will provide a private key in PEM format. It is used for authentication (instead of a password).

For more information, see https://docs.aws.amazon.com/transfer/latest/userguide/getting-started-use-the-service.html

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// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.SFtp sftp = new Chilkat.SFtp();

// Connect to the AWS SFTP server.
// Change the domain to your value.
string domain = "s-123456df999999fab.server.transfer.eu-west-2.amazonaws.com";
int port = 22;
bool success = sftp.Connect(domain,port);
if (success == false) {
    Debug.WriteLine(sftp.LastErrorText);
    return;
}

// Load your AWS SFTP private key PEM file..
Chilkat.SshKey sshKey = new Chilkat.SshKey();
string keyText = sshKey.LoadText("qa_data/pem/s3_sftp_privateKey.pem");
if (sshKey.LastMethodSuccess != true) {
    Debug.WriteLine(sshKey.LastErrorText);
    return;
}

success = sshKey.FromOpenSshPrivateKey(keyText);
if (success == false) {
    Debug.WriteLine(sshKey.LastErrorText);
    return;
}

// Authenticate with the SSH server using the private key.
success = sftp.AuthenticatePk("myUsername",sshKey);
if (success == false) {
    Debug.WriteLine(sftp.LastErrorText);
    return;
}

// After authenticating, the SFTP subsystem must be initialized:
success = sftp.InitializeSftp();
if (success == false) {
    Debug.WriteLine(sftp.LastErrorText);
    return;
}

// Upload from the local file to the SSH server.
// Important -- the remote filepath is the 1st argument,
// the local filepath is the 2nd argument;
string remoteFilePath = "hamlet.xml";
string localFilePath = "c:/temp/hamlet.xml";

success = sftp.UploadFileByName(remoteFilePath,localFilePath);
if (success == false) {
    Debug.WriteLine(sftp.LastErrorText);
    return;
}

Debug.WriteLine("Success.");