Move "Enter a password" cmd instructions to shared/cmd (#5724)

* Move EnterPassword CMD to cmd package

* Add comment

* Add tracking issue and remove log.Fatal

* Add better error handling

* gaz

* Comment fix

* Update shared/cmd/helpers.go

Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>
Co-authored-by: terence tsao <terence@prysmaticlabs.com>

shared/cmd/BUILD.bazel

@@ -13,9 +13,11 @@ go_library(
     importpath = "github.com/prysmaticlabs/prysm/shared/cmd",
     visibility = ["//visibility:public"],
     deps = [
+        "@com_github_pkg_errors//:go_default_library",
         "@com_github_sirupsen_logrus//:go_default_library",
         "@in_gopkg_urfave_cli_v2//:go_default_library",
         "@in_gopkg_urfave_cli_v2//altsrc:go_default_library",
+        "@org_golang_x_crypto//ssh/terminal:go_default_library",
     ],
 )
 

shared/cmd/helpers.go

@@ -3,10 +3,12 @@ package cmd
 import (
 	"bufio"
 	"fmt"
+	"github.com/pkg/errors"
 	"os"
 	"strings"
 
 	"github.com/sirupsen/logrus"
+	"golang.org/x/crypto/ssh/terminal"
 )
 
 var log = logrus.WithField("prefix", "node")
@@ -42,3 +44,18 @@ func ConfirmAction(actionText string, deniedText string) (bool, error) {
 
 	return confirmed, nil
 }
+
+// EnterPassword queries the user for their password through the terminal, in order to make sure it is
+// not passed in a visible way to the terminal.
+// TODO(#5749): This function is untested and should be tested.
+func EnterPassword() (string, error) {
+	var passphrase string
+	log.Info("Enter a password:")
+	bytePassword, err := terminal.ReadPassword(int(os.Stdin.Fd()))
+	if err != nil {
+		return passphrase, errors.Wrap(err, "could not read account password")
+	}
+	text := string(bytePassword)
+	passphrase = strings.Replace(text, "\n", "", -1)
+	return passphrase, nil
+}

validator/accounts/BUILD.bazel

@@ -11,11 +11,11 @@ go_library(
     ],
     deps = [
         "//contracts/deposit-contract:go_default_library",
+        "//shared/cmd:go_default_library",
         "//shared/keystore:go_default_library",
         "//shared/params:go_default_library",
         "@com_github_pkg_errors//:go_default_library",
         "@com_github_sirupsen_logrus//:go_default_library",
-        "@org_golang_x_crypto//ssh/terminal:go_default_library",
     ],
 )
 

validator/accounts/account.go

@@ -14,10 +14,10 @@ import (
 
 	"github.com/pkg/errors"
 	contract "github.com/prysmaticlabs/prysm/contracts/deposit-contract"
+	"github.com/prysmaticlabs/prysm/shared/cmd"
 	"github.com/prysmaticlabs/prysm/shared/keystore"
 	"github.com/prysmaticlabs/prysm/shared/params"
 	"github.com/sirupsen/logrus"
-	"golang.org/x/crypto/ssh/terminal"
 )
 
 var log = logrus.WithField("prefix", "accounts")
@@ -138,16 +138,12 @@ func Exists(keystorePath string) (bool, error) {
 // CreateValidatorAccount creates a validator account from the given cli context.
 func CreateValidatorAccount(path string, passphrase string) (string, string, error) {
 	if passphrase == "" {
-		log.Info("Create a new validator account for eth2")
-		log.Info("Enter a password:")
-		bytePassword, err := terminal.ReadPassword(int(os.Stdin.Fd()))
+		log.Info("Creating a new validator account for eth2")
+		enteredPassphrase, err := cmd.EnterPassword()
 		if err != nil {
-			log.Fatalf("Could not read account password: %v", err)
-			return path, passphrase, err
+			return path, enteredPassphrase, err
 		}
-		text := string(bytePassword)
-		passphrase = strings.Replace(text, "\n", "", -1)
-
+		passphrase = enteredPassphrase
 	}
 
 	if path == "" {
@@ -156,7 +152,6 @@ func CreateValidatorAccount(path string, passphrase string) (string, string, err
 		reader := bufio.NewReader(os.Stdin)
 		text, err := reader.ReadString('\n')
 		if err != nil {
-			log.Fatal(err)
 			return path, passphrase, err
 		}
 		if text = strings.Replace(text, "\n", "", -1); text != "" {