(Objective-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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#import <CkoSFtp.h>
#import <NSString.h>
#import <CkoSshKey.h>

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

CkoSFtp *sftp = [[CkoSFtp alloc] init];

// Connect to the AWS SFTP server.
// Change the domain to your value.
NSString *domain = @"s-123456df999999fab.server.transfer.eu-west-2.amazonaws.com";
int port = 22;
BOOL success = [sftp Connect: domain port: [NSNumber numberWithInt: port]];
if (success == NO) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

// Load your AWS SFTP private key PEM file..
CkoSshKey *sshKey = [[CkoSshKey alloc] init];
NSString *keyText = [sshKey LoadText: @"qa_data/pem/s3_sftp_privateKey.pem"];
if (sshKey.LastMethodSuccess != YES) {
    NSLog(@"%@",sshKey.LastErrorText);
    return;
}

success = [sshKey FromOpenSshPrivateKey: keyText];
if (success == NO) {
    NSLog(@"%@",sshKey.LastErrorText);
    return;
}

// Authenticate with the SSH server using the private key.
success = [sftp AuthenticatePk: @"myUsername" privateKey: sshKey];
if (success == NO) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

// After authenticating, the SFTP subsystem must be initialized:
success = [sftp InitializeSftp];
if (success == NO) {
    NSLog(@"%@",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;
NSString *remoteFilePath = @"hamlet.xml";
NSString *localFilePath = @"c:/temp/hamlet.xml";

success = [sftp UploadFileByName: remoteFilePath localFilePath: localFilePath];
if (success == NO) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

NSLog(@"%@",@"Success.");