(Xojo Plugin) 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 Xojo Plugin Download Xojo Plugin for Windows, Linux, Mac OS X, and ARM, ARM64

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

Dim ftp As New Chilkat.Ftp2

ftp.Hostname = "www.authtls-ftps-server.com"
ftp.Username = "FTP_LOGIN"
ftp.Password = "FTP_PASSWORD"
ftp.AuthTls = True
ftp.Port = 21

// Connect to the FTP server using explicit TLS (AUTH TLS).
Dim success As Boolean
success = ftp.ConnectOnly()
If (success <> True) Then
    System.DebugLog(ftp.LastErrorText)
    Return
End If

// Get the FTP server's certificate.
Dim serverCert As Chilkat.Cert
serverCert = ftp.GetSslServerCert()
If (ftp.LastMethodSuccess <> True) Then
    System.DebugLog(ftp.LastErrorText)
    Return
End If

// 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) Then
    System.DebugLog(ftp.LastErrorText)
    Return
End If

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

success = ftp.Disconnect()
System.DebugLog("Success.")