feat: add ftp backup storage

pkg/ftp.go

@@ -0,0 +1,81 @@
+package pkg
+
+import (
+	"fmt"
+	"github.com/jlaffaye/ftp"
+	"io"
+	"os"
+	"path/filepath"
+	"time"
+)
+
+// initFtpClient initializes and authenticates an FTP client
+func initFtpClient() (*ftp.ServerConn, error) {
+	ftpConfig := initFtpConfig()
+	ftpClient, err := ftp.Dial(fmt.Sprintf("%s:%s", ftpConfig.host, ftpConfig.port), ftp.DialWithTimeout(5*time.Second))
+	if err != nil {
+		return nil, fmt.Errorf("failed to connect to FTP: %w", err)
+	}
+
+	err = ftpClient.Login(ftpConfig.user, ftpConfig.password)
+	if err != nil {
+		return nil, fmt.Errorf("failed to log in to FTP: %w", err)
+	}
+
+	return ftpClient, nil
+}
+
+// CopyToFTP uploads a file to the remote FTP server
+func CopyToFTP(fileName, remotePath string) (err error) {
+	ftpConfig := initFtpConfig()
+	ftpClient, err := initFtpClient()
+	if err != nil {
+		return err
+	}
+	defer ftpClient.Quit()
+
+	filePath := filepath.Join(tmpPath, fileName)
+	file, err := os.Open(filePath)
+	if err != nil {
+		return fmt.Errorf("failed to open file %s: %w", fileName, err)
+	}
+	defer file.Close()
+
+	remoteFilePath := filepath.Join(ftpConfig.remotePath, fileName)
+	err = ftpClient.Stor(remoteFilePath, file)
+	if err != nil {
+		return fmt.Errorf("failed to upload file %s: %w", fileName, err)
+	}
+
+	return nil
+}
+
+// CopyFromFTP downloads a file from the remote FTP server
+func CopyFromFTP(fileName, remotePath string) (err error) {
+	ftpClient, err := initFtpClient()
+	if err != nil {
+		return err
+	}
+	defer ftpClient.Quit()
+
+	remoteFilePath := filepath.Join(remotePath, fileName)
+	r, err := ftpClient.Retr(remoteFilePath)
+	if err != nil {
+		return fmt.Errorf("failed to retrieve file %s: %w", fileName, err)
+	}
+	defer r.Close()
+
+	localFilePath := filepath.Join(tmpPath, fileName)
+	outFile, err := os.Create(localFilePath)
+	if err != nil {
+		return fmt.Errorf("failed to create local file %s: %w", fileName, err)
+	}
+	defer outFile.Close()
+
+	_, err = io.Copy(outFile, r)
+	if err != nil {
+		return fmt.Errorf("failed to copy data to local file %s: %w", fileName, err)
+	}
+
+	return nil
+}