feat: generate a random password

CHANGELOG.md

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

README.md

@@ -10,6 +10,7 @@ gpm is passwords manager write in go and use AES-256 to encrypt the wallets
 - generate OTP code
 - copy your login, password or otp in clipboard
 - manage multiple wallets
+- generate random password
 
 ## Install
 

gpm/cli.go

@@ -17,6 +17,7 @@ package gpm
 import(
   "bufio"
   "fmt"
+  "math/rand"
   "os"
   "strconv"
   "syscall"
@@ -65,6 +66,29 @@ func (c *Cli) printEntries(entries []Entry) {
   }
 }
 
+// generate a random password
+func (c *Cli) generatePassword(length int, letter bool, digit bool, special bool) string {
+	digits := "0123456789"
+	specials := "~=+%^*/()[]{}/!@#$?|"
+	letters := "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+  chars := ""
+	password := make([]byte, length)
+
+  if letter { chars = chars + letters }
+  if digit { chars = chars + digits }
+  if special { chars = chars + specials }
+  if !letter && !digit && !special {
+	  chars = digits + letters
+  }
+
+	rand.Seed(time.Now().UnixNano())
+	for i := 0; i < length; i++ {
+	    password[i] = chars[rand.Intn(len(chars))]
+	}
+
+  return string(password)
+}
+
 // error print a message and exit)
 func (c *Cli) error(msg string) {
   fmt.Println(msg)
@@ -190,7 +214,12 @@ func (c *Cli) addEntry() {
   entry.Group    = c.input("Enter the group: ", "", true)
   entry.URI      = c.input("Enter the URI: ",  "", true)
   entry.User     = c.input("Enter the username: ", "", true)
-  entry.Password = c.input("Enter the password: ", "", false)
+  if *RANDOM {
+    entry.Password = c.generatePassword(c.Config.PasswordLength,
+      c.Config.PasswordLetter, c.Config.PasswordDigit, c.Config.PasswordSpecial)
+  } else {
+    entry.Password = c.input("Enter the new password: ", entry.Password, false)
+  }
   entry.OTP      = c.input("Enter the OTP key: ", "", false)
   entry.Comment  = c.input("Enter a comment: ", "", true)
 
@@ -210,7 +239,12 @@ func (c *Cli) updateEntry() {
   entry.Group    = c.input("Enter the new group: ", entry.Group, true)
   entry.URI      = c.input("Enter the new URI: ", entry.URI, true)
   entry.User     = c.input("Enter the new username: ", entry.User, true)
-  entry.Password = c.input("Enter the new password: ", entry.Password, false)
+  if *RANDOM {
+    entry.Password = c.generatePassword(c.Config.PasswordLength,
+      c.Config.PasswordLetter, c.Config.PasswordDigit, c.Config.PasswordSpecial)
+  } else {
+    entry.Password = c.input("Enter the new password: ", entry.Password, false)
+  }
   entry.OTP      = c.input("Enter the new OTP key: ", entry.OTP, false)
   entry.Comment  = c.input("Enter a new comment: ", entry.Comment, true)
 

gpm/config.go

@@ -25,8 +25,12 @@ import (
 
 // Config struct contain the config
 type Config struct {
-  WalletDir     string            `json:"wallet_dir"`
-  WalletDefault string            `json:"wallet_default"`
+  WalletDir       string `json:"wallet_dir"`
+  WalletDefault   string `json:"wallet_default"`
+  PasswordLength  int    `json:"password_length"`
+  PasswordLetter  bool   `json:"password_letter"`
+  PasswordDigit   bool   `json:"password_digit"`
+  PasswordSpecial bool   `json:"password_special"`
 }
 
 // Init the configuration
@@ -43,7 +47,11 @@ func (c *Config) Init() error {
   } else {
     c.WalletDir = fmt.Sprintf("%s/.config/mpw", user.HomeDir)
   }
-  c.WalletDefault = "default"
+  c.WalletDefault   = "default"
+  c.PasswordLength  = 16
+  c.PasswordLetter  = true
+  c.PasswordDigit   = true
+  c.PasswordSpecial = false
 
   return nil
 }

gpm/main.go

@@ -15,6 +15,7 @@
 package gpm
 
 import(
+  "fmt"
   "flag"
   "os"
 )
@@ -25,11 +26,17 @@ var(
   UPDATE  = flag.Bool("update", false, "update an entry")
   DELETE  = flag.Bool("delete", false, "delete an entry")
   LIST    = flag.Bool("list", false, "list the entries in a wallet")
+  LENGTH  = flag.Int("length", 16, "specify the password length")
   COPY    = flag.Bool("copy", false, "enter an copy mode for an entry")
   CONFIG  = flag.String("config", "", "specify the config file")
   GROUP   = flag.String("group", "", "search the entries in this group ")
-  PATTERN = flag.String("pattern", "", "search the entries with this pattern")
   WALLET  = flag.String("wallet", "", "specify the wallet")
+  PATTERN = flag.String("pattern", "", "search the entries with this pattern")
+  RANDOM  = flag.Bool("random", false, "generate a random password for a new entry or an update")
+  PASSWD  = flag.Bool("password", false, "generate and print a random password")
+  DIGIT   = flag.Bool("digit", false, "use digit to generate a random password")
+  LETTER  = flag.Bool("letter", false, "use letter to generate a random password")
+  SPECIAL = flag.Bool("special", false, "use special chars to generate a random password")
   HELP    = flag.Bool("help", false, "print this help message")
 )
 
@@ -42,6 +49,8 @@ func Run() {
   if *HELP {
     flag.PrintDefaults()
     os.Exit(1)
+  } else if *PASSWD {
+    fmt.Println(cli.generatePassword(*LENGTH, *LETTER, *DIGIT, *SPECIAL))
   } else if *LIST {
     cli.listEntry()
   } else if *COPY {