Move packages out of src/

backend/gpg.go

@@ -0,0 +1,39 @@
+package backend
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+// TODO GPG support is a temporary feature - it will be replaced with a different encryption scheme in the future
+
+// DecryptGPG decrypts a GPG-encrypted file and returns the contents as a slice of (trimmed) strings
+func DecryptGPG(targetLocation string) []string {
+	cmd := exec.Command("gpg", "--pinentry-mode", "loopback", "-q", "-d", targetLocation)
+	output, err := cmd.Output()
+
+	// ensure ANSI escape sequences are interpreted properly on Windows
+	enableVirtualTerminalProcessing()
+
+	if err != nil {
+		fmt.Println(AnsiError + "Failed to decrypt \"" + targetLocation + "\" - ensure it is a valid GPG-encrypted file and that you entered your passphrase correctly" + AnsiReset)
+		os.Exit(1)
+	}
+	outputSlice := strings.Split(string(output), "\n")
+
+	return outputSlice
+}
+
+// EncryptGPG encrypts a slice of strings using GPG and returns the encrypted data as a byte slice
+func EncryptGPG(input []string) []byte {
+	cmd := exec.Command("gpg", "-q", "-r", ParseConfig([][2]string{{"LIBMUTTON", "gpgID"}}, "")[0], "-e")
+	writeToStdin(cmd, strings.Join(input, "\n"))
+	encryptedBytes, err := cmd.Output()
+	if err != nil {
+		fmt.Println(AnsiError + "Failed to encrypt data - ensure that your GPG key is valid and that you have a valid GPG ID set in libmutton.ini" + AnsiReset)
+		os.Exit(1)
+	}
+	return encryptedBytes
+}