如何从Ruby中的命令行读取密码？

Question

I am running Ruby and MySQL on a Windows box.

I have some Ruby code that needs to connect to a MySQL database a perform a select. To connect to the database I need to provide the password among other things.

The Ruby code can display a prompt requesting the password, the user types in the password and hits the Enter key. What I need is for the password, as it is typed, to be displayed as a line of asterisks.

How can I get Ruby to display the typed password as a line of asterisks in the 'dos box'?

Answer 1

To answer my own question, and for the benefit of anyone else who would like to know, there is a Ruby gem called HighLine that you need.

require 'rubygems'
require 'highline/import'

def get_password(prompt="Enter Password")
   ask(prompt) {|q| q.echo = false}
end

thePassword = get_password()

Answer 2

Poor man's solution:

system "stty -echo"
# read password
system "stty echo"

Or using http://raa.ruby-lang.org/project/ruby-password/

The target audience for this library is system administrators who need to write Ruby programs that prompt for, generate, verify and encrypt passwords.

Edit: Whoops I failed to notice that you need this for Windows :(

Answer 3

According to the Highline doc, this seems to work. Not sure if it will work on Windows.

#!/usr/local/bin/ruby
require 'rubygems'
require 'highline/import'

username = ask("Enter your username:  ") { |q| q.echo = true }
password = ask("Enter your password:  ") { |q| q.echo = "*" }

Here's the output on the console:

$ ruby highline.rb 
Enter your username:  doug
Enter your password:  ******

Answer 4

The following works (lobin.rb) in ruby not jruby

require 'highline/import'

$userid = ask("Enter your username:  ") { |q| q.echo = true }
$passwd = ask("Enter your password:  ") { |q| q.echo = "*" }

Output from console:

E:\Tools>ruby login.rb
Enter your username:  username
Enter your password:  ********

Howerver if I run in jruby it fails and gives no opportunity to enter your password.

E:\Tools>jruby login.rb
Enter your username:  username
Enter your password:

Answer 5

Starting from Ruby 2.3 you can use the IO#getpass method as such:

require 'io/console' 

STDIN.getpass("Password: ")

http://ruby-doc.org/stdlib-2.3.0/libdoc/io/console/rdoc/IO.html#method-i-getpass

The above is copied from a deleted answer by Zoran Majstorovic .

Answer 6

The fancy_gets gem has a password thing that works fine with jruby:

https://github.com/lorint/fancy_gets

Code ends up like:

require 'fancy_gets'
include FancyGets

puts "Password:"
pwd = gets_password
# ...