feat: print the expiration time of TOTP code

CHANGELOG.md

@@ -11,6 +11,7 @@ Which is based on [Keep A Changelog](http://keepachangelog.com/)
 
 - Use go module to get this software
 - Generate random password
+- Print the expiration time of TOTP code
 
 ## v1.0.0 - 2019-07-12
 

README.md

@@ -7,7 +7,7 @@ gpm is passwords manager write in go and use AES-256 to encrypt the wallets
 
 ## Features
 
-- generate OTP code
+- generate TOTP code
 - copy your login, password or otp in clipboard
 - manage multiple wallets
 - generate random password

gpm/cli.go

@@ -267,7 +267,9 @@ func (c *Cli) copyEntry() {
       case "p":
         clipboard.WriteAll(entry.Password)
       case "o":
-        clipboard.WriteAll(entry.OTPCode())
+        code, time, _ := entry.OTPCode()
+        fmt.Printf("this OTP code is available for %d seconds\n", time)
+        clipboard.WriteAll(code)
       case "q":
         os.Exit(0)
       default:

gpm/entry.go

@@ -58,7 +58,12 @@ func (e *Entry) GenerateID() {
 }
 
 // OTPCode generate an OTP Code
-func (e *Entry) OTPCode() string {
-  code, _ := totp.GenerateCode(e.OTP, time.Now())
-  return code
+func (e *Entry) OTPCode() (string, int64, error){
+  code, err := totp.GenerateCode(e.OTP, time.Now())
+  time := 30 - (time.Now().Unix() % 30)
+  if err != nil {
+    return "", 0, err
+  }
+
+  return code, time, nil
 }