(Objective-C) Upload to Tumbleweed SecureTransport FTPS Server

Demonstrates how to connect, authenticate, and upload file to a Tumbleweed Secure Transport SSL FTP Server. Instead of providing a login name and password, you pass the string "site-auth" for the username, and an empty string for the password. You must also provide a client-side digital certificate -- as the certificate's credentials and validity are used to authenticate.

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#import <CkoFtp2.h>
#import <CkoCertStore.h>
#import <NSString.h>
#import <CkoCert.h>

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

CkoFtp2 *ftp = [[CkoFtp2 alloc] init];

// This code has been tested with the Tumbleweed server
// at sft.wellsfargo.com
ftp.Hostname = @"sft.wellsfargo.com";

// Use these exact strings for the username and password:
ftp.Username = @"site-auth";
ftp.Password = @"";

// Establish an AUTH SSL secure channel after connecting.
// Your client-side certificate is used for authentication when
// the SSL channel is established.
ftp.AuthSsl = YES;

// The Ssl property is for establishing an implicit SSL connection
// on port 990.  Do not set it.
ftp.Ssl = NO;

// Load a certificate from a .pfx
// A PFX may contain several certs, including the certificates
// in a chain of authority.
CkoCertStore *certStore = [[CkoCertStore alloc] init];
NSString *password = @"***";
// Load the certs from a PFX into an in-memory certificate store:
BOOL success = [certStore LoadPfxFile: @"my.pfx" password: password];
if (success != YES) {
    NSLog(@"%@",certStore.LastErrorText);
    return;
}

// Find the exact cert we'll use:
CkoCert *cert = [certStore FindCertBySubject: @"My Certificate 123 ABC"];
if (certStore.LastMethodSuccess == NO) {
    NSLog(@"%@",@"Certificate not found!");
    return;
}

// Tell the Chilkat FTP2 component to use the client-side
// cert for the SSL connection:
success = [ftp SetSslClientCert: cert];

// Connect and authenticate with the FTP server.
success = [ftp Connect];
if (success != YES) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}
else {
    // LastErrorText contains information even when
    // successful. This allows you to visually verify
    // that the secure connection actually occurred.
    NSLog(@"%@",ftp.LastErrorText);
}

NSLog(@"%@",@"Secure FTP Channel Established!");

// Change to the remote directory where the file will be
// uploaded.  If your file is to be uploaded to the FTP user 
// account's home directory, this is not necessary.
success = [ftp ChangeRemoteDir: @"someSubDir"];
if (success != YES) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

// You may include an absolute or relative path with the 
// local filename.  If no path is included, the file should 
// be present in the current working directory of the calling
// process.
NSString *localFilename = @"someFile.dat";
NSString *remoteFilename = @"someFile.dat";

// Upload the file.
success = [ftp PutFile: localFilename remoteFilename: remoteFilename];
if (success != YES) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

success = [ftp Disconnect];