Go: file upload via FTP

File Transfer Protocol (FTP) is a standard protocol used for transferring files between a client and a server over a network. In this article, well explore how to upload files via FTP in Go, a versatile and powerful programming language. Well learn how to connect to an FTP server, upload a file, and handle any errors along the way.

Lets start by installing the "goftp" library which will simplify the interaction with the FTP server. Open a terminal and type the following command to install the library:

go get github.com/jlaffaye/ftp

After installing the dependencies, lets create a new file called "main.go" and open up our favorite text editor to start coding.

package main

import (
	"fmt"
	"github.com/jlaffaye/ftp"
	"os"
)

func main() {
	// Dati di accesso al server FTP
	ftpServer := "ftp.example.com"
	username := "your_username"
	password := "your_password"

	// Percorso del file locale da caricare
	localFilePath := "path/to/your/file.txt"

	// Percorso di destinazione sul server FTP
	remoteDir := "/path/on/ftp/server/"

	// Connessione al server FTP
	ftpClient, err := ftp.Dial(ftpServer)
	if err != nil {
		fmt.Println("Errore durante la connessione al server FTP:", err)
		return
	}
	defer ftpClient.Quit()

	// Autenticazione
	err = ftpClient.Login(username, password)
	if err != nil {
		fmt.Println("Errore durante l'autenticazione:", err)
		return
	}

	// Apertura del file locale
	file, err := os.Open(localFilePath)
	if err != nil {
		fmt.Println("Impossibile aprire il file locale:", err)
		return
	}
	defer file.Close()

	// Creazione della directory remota (se non esiste)
	err = ftpClient.MakeDir(remoteDir)
	if err != nil {
		fmt.Println("Errore durante la creazione della directory remota:", err)
	}

	// Caricamento del file
	remoteFilePath := remoteDir + "file.txt"
	err = ftpClient.Stor(remoteFilePath, file)
	if err != nil {
		fmt.Println("Errore durante il caricamento del file:", err)
		return
	}

	fmt.Println("File caricato con successo!")
}

Before running the code, be sure to replace the values of "ftpServer", "username", "password", "localFilePath" and "remoteDir" with the appropriate data of your FTP server and file to upload.