feat(client): Add flag & reading mnemonic from file (backport #20690) (#20712)

Co-authored-by: Hieu Vu <72878483+hieuvubk@users.noreply.github.com>
Co-authored-by: marbar3778 <marbar3778@yahoo.com>

CHANGELOG.md

@@ -38,6 +38,10 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
 
+## Features
+
+* (client) [#20690](https://github.com/cosmos/cosmos-sdk/pull/20690) Import mnemonic from file
+
 ## Improvements
 
 * (x/authz,x/feegrant) [#20590](https://github.com/cosmos/cosmos-sdk/pull/20590) Provide updated keeper in depinject for authz and feegrant modules.

client/keys/add.go

@@ -7,6 +7,8 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"io"
+	"os"
 	"sort"
 
 	"github.com/cosmos/go-bip39"
@@ -35,6 +37,8 @@ const (
 	flagNoSort       = "nosort"
 	flagHDPath       = "hd-path"
 	flagPubKeyBase64 = "pubkey-base64"
+	flagIndiscreet   = "indiscreet"
+	flagMnemonicSrc  = "source"
 
 	// DefaultKeyPass contains the default key password for genesis transactions
 	DefaultKeyPass = "12345678"
@@ -57,6 +61,11 @@ local keystore.
 Use the --pubkey flag to add arbitrary public keys to the keystore for constructing
 multisig transactions.
 
+Use the --source flag to import mnemonic from a file in recover or interactive mode. 
+Example:
+
+	keys add testing --recover --source ./mnemonic.txt
+
 You can create and store a multisig key by passing the list of key names stored in a keyring
 and the minimum number of signatures required through --multisig-threshold. The keys are
 sorted by address, unless the flag --nosort is set.
@@ -83,6 +92,8 @@ Example:
 	f.Uint32(flagAccount, 0, "Account number for HD derivation (less than equal 2147483647)")
 	f.Uint32(flagIndex, 0, "Address index number for HD derivation (less than equal 2147483647)")
 	f.String(flags.FlagKeyType, string(hd.Secp256k1Type), "Key signing algorithm to generate keys for")
+	f.Bool(flagIndiscreet, false, "Print seed phrase directly on current terminal (only valid when --no-backup is false)")
+	f.String(flagMnemonicSrc, "", "Import mnemonic from a file (only usable when recover or interactive is passed)")
 
 	// support old flags name for backwards compatibility
 	f.SetNormalizeFunc(func(f *pflag.FlagSet, name string) pflag.NormalizedName {
@@ -270,19 +281,34 @@ func runAddCmd(ctx client.Context, cmd *cobra.Command, args []string, inBuf *buf
 	var mnemonic, bip39Passphrase string
 
 	recoverFlag, _ := cmd.Flags().GetBool(flagRecover)
+	mnemonicSrc, _ := cmd.Flags().GetString(flagMnemonicSrc)
 	if recoverFlag {
-		mnemonic, err = input.GetString("Enter your bip39 mnemonic", inBuf)
-		if err != nil {
-			return err
+		if mnemonicSrc != "" {
+			mnemonic, err = readMnemonicFromFile(mnemonicSrc)
+			if err != nil {
+				return err
+			}
+		} else {
+			mnemonic, err = input.GetString("Enter your bip39 mnemonic", inBuf)
+			if err != nil {
+				return err
+			}
 		}
 
 		if !bip39.IsMnemonicValid(mnemonic) {
 			return errors.New("invalid mnemonic")
 		}
 	} else if interactive {
-		mnemonic, err = input.GetString("Enter your bip39 mnemonic, or hit enter to generate one.", inBuf)
-		if err != nil {
-			return err
+		if mnemonicSrc != "" {
+			mnemonic, err = readMnemonicFromFile(mnemonicSrc)
+			if err != nil {
+				return err
+			}
+		} else {
+			mnemonic, err = input.GetString("Enter your bip39 mnemonic, or hit enter to generate one.", inBuf)
+			if err != nil {
+				return err
+			}
 		}
 
 		if !bip39.IsMnemonicValid(mnemonic) && mnemonic != "" {
@@ -377,3 +403,17 @@ func printCreate(cmd *cobra.Command, k *keyring.Record, showMnemonic bool, mnemo
 
 	return nil
 }
+
+func readMnemonicFromFile(filePath string) (string, error) {
+	file, err := os.Open(filePath)
+	if err != nil {
+		return "", err
+	}
+	defer file.Close()
+
+	bz, err := io.ReadAll(file)
+	if err != nil {
+		return "", err
+	}
+	return string(bz), nil
+}