[node.sh] added persist after read from prompt

cmd/harmony/blsloader/helper.go

@@ -1,11 +1,15 @@
 package blsloader
 
 import (
+	"bufio"
 	"fmt"
 	"io"
 	"os"
 	"path/filepath"
 	"strings"
+	"syscall"
+
+	"golang.org/x/crypto/ssh/terminal"
 
 	ffibls "github.com/harmony-one/bls/ffi/go/bls"
 	"github.com/harmony-one/harmony/internal/blsgen"
@@ -137,3 +141,48 @@ func isKMSKeyFile(info os.FileInfo) bool {
 	}
 	return true
 }
+
+// keyFileToPassFile convert a key file base name to passphrase file base name
+func keyFileToPassFile(keyFileBase string) string {
+	return strings.Trim(keyFileBase, basicKeyExt) + passExt
+}
+
+// passFileToKeyFile convert a pass file base name to key file base name
+func passFileToKeyFile(passFileBase string) string {
+	return strings.Trim(passFileBase, passExt) + basicKeyExt
+}
+
+func promptGetPassword(prompt string) (string, error) {
+	if !strings.HasSuffix(prompt, ":") {
+		prompt += ":"
+	}
+	fmt.Print(prompt)
+	b, err := terminal.ReadPassword(syscall.Stdin)
+	if err != nil {
+		return "", err
+	}
+	return string(b), nil
+}
+
+const yesNoPrompt = "[y/n]: "
+
+func promptYesNo(prompt string) (bool, error) {
+	if !strings.HasSuffix(prompt, yesNoPrompt) {
+		prompt = prompt + yesNoPrompt
+	}
+	reader := bufio.NewReader(os.Stdin)
+	for {
+		fmt.Print(prompt)
+		response, err := reader.ReadString('\n')
+		if err != nil {
+			return false, err
+		}
+		response = strings.ToLower(response)
+
+		if response == "y" || response == "yes" {
+			return true, nil
+		} else if response == "n" || response == "no" {
+			return false, nil
+		}
+	}
+}

cmd/harmony/blsloader/params.go

@@ -11,3 +11,8 @@ const (
 const (
 	defPromptTimeout = 1 * time.Second
 )
+
+const (
+	defWritePassDirMode  = 0600
+	defWritePassFileMode = 0600
+)

cmd/harmony/blsloader/passProvider.go

@@ -5,10 +5,6 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
-	"strings"
-	"syscall"
-
-	"golang.org/x/crypto/ssh/terminal"
 )
 
 // passProvider is the interface to provide the passphrase of a bls keys.
@@ -23,7 +19,13 @@ type passProvider interface {
 }
 
 // promptPassProvider provides the bls password through console prompt.
-type promptPassProvider struct{}
+type promptPassProvider struct {
+	// if enablePersist is true, after user enter the passphrase, the
+	// passphrase is also persisted into the persistDir
+	enablePersist bool
+	persistDir    string
+	mode          int
+}
 
 const pwdPromptStr = "Enter passphrase for the BLS key file %s:"
 
@@ -31,13 +33,45 @@ func newPromptPassProvider() *promptPassProvider {
 	return &promptPassProvider{}
 }
 
+func (provider *promptPassProvider) setPersist(dirPath string, mode int) *promptPassProvider {
+	provider.enablePersist = true
+	os.MkdirAll(dirPath, defWritePassDirMode)
+	provider.persistDir = dirPath
+	provider.mode = mode
+
+	return provider
+}
+
 func (provider *promptPassProvider) getPassphrase(keyFile string) (string, error) {
-	fmt.Printf(pwdPromptStr, keyFile)
+	prompt := fmt.Sprintf(pwdPromptStr, keyFile)
-	hexBytes, err := terminal.ReadPassword(syscall.Stdin)
+	pass, err := promptGetPassword(prompt)
 	if err != nil {
 		return "", err
 	}
-	return string(hexBytes), nil
+	if provider.enablePersist {
+		if err := provider.persistPassphrase(keyFile, pass); err != nil {
+			return "", err
+		}
+	}
+	return pass, nil
+
+}
+
+func (provider *promptPassProvider) persistPassphrase(keyFile string, passPhrase string) error {
+	passFile := filepath.Join(provider.persistDir, filepath.Base(keyFile))
+	if _, err := os.Stat(passFile); os.IsNotExist(err) {
+		// file not exist. Go on create the file
+	} else if err == nil {
+		// File exist. Prompt user to overwrite pass file
+		overwrite, err := promptYesNo(fmt.Sprintf("pass file [%v] already exist. Overwrite? ", passFile))
+		if err != nil {
+			return err
+		}
+		if !overwrite {
+			return nil
+		}
+	}
+	return ioutil.WriteFile(passFile, []byte(passPhrase), defWritePassFileMode)
 }
 
 // filePassProvider provide the bls password from the single bls pass file
@@ -76,8 +110,8 @@ type dirPassProvider struct {
 
 func (provider *dirPassProvider) getPassphrase(keyFile string) (string, error) {
 	baseName := filepath.Base(keyFile)
-	pubKey := strings.TrimSuffix(baseName, basicKeyExt)
+	passKeyBase := keyFileToPassFile(baseName)
-	passFile := filepath.Join(provider.dirPath, pubKey+passExt)
+	passFile := filepath.Join(provider.dirPath, passKeyBase)
 	return readPassFromFile(passFile)
 }