Add backup encryption and decryption with GPG

pkg/encrypt.go

@@ -0,0 +1,48 @@
+package pkg
+
+import (
+	"fmt"
+	"github.com/jkaninda/pg-bkup/utils"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+func Decrypt(inputFile string, passphrase string) error {
+	utils.Info("Decrypting backup...")
+	cmd := exec.Command("gpg", "--batch", "--passphrase", passphrase, "--output", RemoveLastExtension(inputFile), "--decrypt", inputFile)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+
+	err := cmd.Run()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+		return err
+	}
+
+	utils.Info("Backup file decrypted successful!")
+	return nil
+}
+
+func Encrypt(inputFile string, passphrase string) error {
+	utils.Info("Encrypting backup...")
+	cmd := exec.Command("gpg", "--batch", "--passphrase", passphrase, "--symmetric", "--cipher-algo", algorithm, inputFile)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+
+	err := cmd.Run()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+		return err
+	}
+
+	utils.Info("Backup file encrypted successful!")
+	return nil
+}
+
+func RemoveLastExtension(filename string) string {
+	if idx := strings.LastIndex(filename, "."); idx != -1 {
+		return filename[:idx]
+	}
+	return filename
+}