(Go) FTP Connect, Examine Server Certificate, and then Authenticate

Demonstrates how to connect to an FTP server, examine the server's SSL/TLS certificate, and then, if it meets the application's security requirements, proceed to authenticate.

Chilkat Go Downloads Go Package for Windows, MacOS, Linux, Alpine Linux, Solaris

    // This example assumes Chilkat Ftp2 to have been previously unlocked.
    // See Unlock Ftp2 for sample code.

    ftp := chilkat.NewFtp2()

    ftp.SetHostname("www.authtls-ftps-server.com")
    ftp.SetUsername("FTP_LOGIN")
    ftp.SetPassword("FTP_PASSWORD")
    ftp.SetAuthTls(true)
    ftp.SetPort(21)

    // Connect to the FTP server using explicit TLS (AUTH TLS).
    success := ftp.ConnectOnly()
    if success != true {
        fmt.Println(ftp.LastErrorText())
        ftp.DisposeFtp2()
        return
    }

    // Get the FTP server's certificate.
    serverCert := ftp.GetSslServerCert()
    if ftp.LastMethodSuccess() != true {
        fmt.Println(ftp.LastErrorText())
        ftp.DisposeFtp2()
        return
    }

    // Now that we have the certificate, we can check it in any way we desire.
    // (See the online reference documentation for the certificate object's methods
    // and properties)...

    // Assuming the certificate is OK, proceed to authenticate with the FTP server.
    success = ftp.LoginAfterConnectOnly()
    if success != true {
        fmt.Println(ftp.LastErrorText())
        ftp.DisposeFtp2()
        return
    }

    // 
    // Proceed with uploading/download files, etc...
    // 

    ftp.Disconnect()
    fmt.Println("Success.")

    ftp.DisposeFtp2()