lnd: extract ReadPassphrase into own function

lnd/aezeed.go

@@ -25,6 +25,7 @@ var (
 	multipleSpaces  = regexp.MustCompile(" [ ]+")
 )
 
+// ReadAezeed reads an aezeed from the console or the environment variable.
 func ReadAezeed(params *chaincfg.Params) (*hdkeychain.ExtendedKey, time.Time,
 	error) {
 
@@ -67,6 +68,32 @@ func ReadAezeed(params *chaincfg.Params) (*hdkeychain.ExtendedKey, time.Time,
 			len(cipherSeedMnemonic), 24)
 	}
 
+	passphraseBytes, err := ReadPassphrase("doesn't have")
+	if err != nil {
+		return nil, time.Unix(0, 0), err
+	}
+
+	var mnemonic aezeed.Mnemonic
+	copy(mnemonic[:], cipherSeedMnemonic)
+
+	// If we're unable to map it back into the ciphertext, then either the
+	// mnemonic is wrong, or the passphrase is wrong.
+	cipherSeed, err := mnemonic.ToCipherSeed(passphraseBytes)
+	if err != nil {
+		return nil, time.Unix(0, 0), fmt.Errorf("failed to decrypt "+
+			"seed with passphrase: %w", err)
+	}
+	rootKey, err := hdkeychain.NewMaster(cipherSeed.Entropy[:], params)
+	if err != nil {
+		return nil, time.Unix(0, 0), fmt.Errorf("failed to derive " +
+			"master extended key")
+	}
+	return rootKey, cipherSeed.BirthdayTime(), nil
+}
+
+// ReadPassphrase reads a cipher seed passphrase from the console or the
+// environment variable.
+func ReadPassphrase(verb string) ([]byte, error) {
 	// Additionally, the user may have a passphrase, that will also need to
 	// be provided so the daemon can properly decipher the cipher seed.
 	// Try the environment variable first.
@@ -85,14 +112,14 @@ func ReadAezeed(params *chaincfg.Params) (*hdkeychain.ExtendedKey, time.Time,
 	// The environment variable didn't contain anything, we'll read the
 	// passphrase from the terminal.
 	case passphrase == "":
-		fmt.Printf("Input your cipher seed passphrase (press enter " +
-			"if your seed doesn't have a passphrase): ")
+		fmt.Printf("Input your cipher seed passphrase (press enter "+
+			"if your seed %s a passphrase): ", verb)
 		var err error
 		passphraseBytes, err = terminal.ReadPassword(
 			int(syscall.Stdin), //nolint
 		)
 		if err != nil {
-			return nil, time.Unix(0, 0), err
+			return nil, err
 		}
 		fmt.Println()
 
@@ -101,20 +128,5 @@ func ReadAezeed(params *chaincfg.Params) (*hdkeychain.ExtendedKey, time.Time,
 		passphraseBytes = []byte(passphrase)
 	}
 
-	var mnemonic aezeed.Mnemonic
-	copy(mnemonic[:], cipherSeedMnemonic)
-
-	// If we're unable to map it back into the ciphertext, then either the
-	// mnemonic is wrong, or the passphrase is wrong.
-	cipherSeed, err := mnemonic.ToCipherSeed(passphraseBytes)
-	if err != nil {
-		return nil, time.Unix(0, 0), fmt.Errorf("failed to decrypt "+
-			"seed with passphrase: %w", err)
-	}
-	rootKey, err := hdkeychain.NewMaster(cipherSeed.Entropy[:], params)
-	if err != nil {
-		return nil, time.Unix(0, 0), fmt.Errorf("failed to derive " +
-			"master extended key")
-	}
-	return rootKey, cipherSeed.BirthdayTime(), nil
+	return passphraseBytes, nil
 }