(Swift 2) REST through SSH Tunnel

Demonstrates how to connect through an SSH Tunnel (via port-forwarding) to make REST API calls.

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

    let tunnel = CkoSocket()

    var sshHostname: String? = "sftp.example.com"
    var sshPort: Int = 22

    // Connect to an SSH server and establish the SSH tunnel:
    var success: Bool = tunnel.SshOpenTunnel(sshHostname, sshPort: sshPort)
    if success != true {
        print("\(tunnel.LastErrorText)")
        return
    }

    // Authenticate with the SSH server via a login/password
    // or with a public key.
    // This example demonstrates SSH password authentication.
    success = tunnel.SshAuthenticatePw("mySshLogin", sshPassword: "mySshPassword")
    if success != true {
        print("\(tunnel.LastErrorText)")
        return
    }

    //  OK, the SSH tunnel is setup.  Now open a channel within the tunnel.
    //  (Any number of channels may be created from the same SSH tunnel.
    //  Multiple channels may coexist at the same time.)

    // This example connects to a REST server through the SSH tunnel.
    // It will connect to the Amazon AWS service for this example.
    let rest = CkoRest()
    var channel: CkoSocket?

    var bTls: Bool = true
    var port: Int = 443
    var maxWaitMs: Int = 5000

    // This returns a socket object that is a single channel within the SSH tunnel.
    channel = tunnel.SshOpenChannel("s3.amazonaws.com", port: port, ssl: bTls, maxWaitMs: maxWaitMs)
    if tunnel.LastMethodSuccess != true {
        print("\(tunnel.LastErrorText)")
        return
    }

    // Use the connection.  (This connection is a TLS running on an SSH channel through an SSH tunnel.
    // In other words, TLS is wrapped within the SSH tunnel.)
    success = rest.UseConnection(channel, autoReconnect: true)
    if success != true {
        print("\(rest.LastErrorText)")
        channel = nil
        return
    }

    // Provide AWS credentials for the REST call.
    let authAws = CkoAuthAws()
    authAws.AccessKey = "AWS_ACCESS_KEY"
    authAws.SecretKey = "AWS_SECRET_KEY"
    authAws.ServiceName = "s3"
    success = rest.SetAuthAws(authAws)

    // List all buckets for the account...
    var responseXml: String? = rest.FullRequestNoBody("GET", uriPath: "/")
    if rest.LastMethodSuccess != true {
        print("\(rest.LastErrorText)")
        channel = nil
        return
    }

    let xml = CkoXml()
    success = xml.LoadXml(responseXml)

    // Show the full XML returned.
    print("\(xml.GetXml())")

    // Iterate over the buckets, showing each bucket name.
    success = xml.FindChild2("Buckets")
    if xml.FirstChild2() == true {
        print("\(xml.GetChildContent("Name"))")
        while (xml.NextSibling2() == true) {
            print("\(xml.GetChildContent("Name"))")
        }

    }

    // Move the internal pointer back to the root node.
    xml.GetRoot2()

    channel = nil

}