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@kares kares/password.rb forked from steakknife/password.rb
Created Jan 12, 2016

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get password - Ruby - any platform - no gems needed
# Copyright 2012-2013 Barry Allard <barry.allard@gmail.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without modification,
# are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# 3. The names of its contributors may not be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
# OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
# THE POSSIBILITY OF SUCH DAMAGE.
# Ask for a password from CLI,
# if it exists.
module Password
# --- Platform inspectors
def windows? ; RUBY_PLATFORM =~ /win(32|dows|ce)|djgpp|(ms|cyg|bcc)win|mingw32/i end
def jruby? ; RUBY_PLATFORM =~ /java/i end
def os2? ; RUBY_PLATFORM =~ /os2/i end
def beos? ; RUBY_PLATFORM =~ /beos/i end
def unix? ; !jruby? && !windows? && !os2? && !beos end
# NOTE: 99.999% of mac detection code has a subtle flaw.
# i.e.: RUBY_PLATFORM =~ /darwin|apple|mac/i
def mac? ; RUBY_PLATFORM =~ /.*(sal|86).*-darwin1/i end # e.g.. 'x86_64-darwin11.3.0' MRI 1.9.3 Lion
# 'x86_64-apple-darwin11.3.0' Rubinius Lion
# 'i686-darwin11.3.0' RubyEnterprise Lion
# 'universal-darwin10.0' MacRuby Lion
def ios? ; RUBY_PLATFORM =~ /arm-darwin/i end # e.g., 'arm-darwin9'
# Can you spot the implication?
def linux? ; RUBY_PLATFORM =~ /linux/i end
# patches welcome: rh, oel, sl, slc, cent, fed, ubt, deb, mint, sles, suse, arch, parabola, nixos, ad ⧝
def bsd? ; freebsd? || netbsd? || openbsd? end
def freebsd? ; RUBY_PLATFORM =~ /freebsd/i end
def netbsd? ; RUBY_PLATFORM =~ /netbsd/i end
def openbsd? ; RUBY_PLATFORM =~ /openbsd/i end
def solaris? ; RUBY_PLATFORM =~ /solaris/i end
# TODO: cleanly chain signal handlers to prevent leaving -(echo|icanon)
# --- Lé code
def ask_for_password_on_unix(prompt = "Enter password: ")
raise 'Could not ask for password because there is no interactive terminal (tty)' unless $stdin.tty?
unless prompt.nil?
$stderr.print prompt
$stderr.flush
end
raise 'Could not disable echo to ask for password security' unless system 'stty -echo -icanon'
password = $stdin.gets
password.chomp! if password
password
ensure
raise 'Could not re-enable echo while securely asking for password' unless system 'stty echo icanon'
end
def ask_for_password_on_windows(prompt = "Enter password: ")
raise 'Could not ask for password because there is no interactive terminal (tty)' unless $stdin.tty?
require 'Win32API'
char = nil
password = ''
unless prompt.nil?
$stderr.print prompt
$stderr.flush
end
while char = Win32API.new("crtdll", "_getch", [ ], "L").Call do
break if char == 10 || char == 13 # return or newline
if char == 127 || char == 8 # backspace and delete
password[-1] = ' '
password.slice!(-1, 1)
else
password << char.chr
end
end
char = ' '
$stderr.puts
password
end
def ask_for_password_on_jruby(prompt = "Enter password: ")
raise 'Could not ask for password because there is no interactive terminal (tty)' unless $stdin.tty?
password=''
require 'java'
include_class 'java.lang.System'
include_class 'java.io.Console'
unless prompt.nil?
$stderr.print prompt
$stderr.flush
end
console = System.console()
return unless console != java.null
loop do
break unless (read_passwd = console.readPassword()) != java.null
passwd_chr = java.lang.String.new(read_passwd).to_string
case passwd_chr in
when "\e" # ESC
password.length.times do |i|
password[i] = ' '
end
return nil
when "", "\r", "\n" # Enter (for certain), ..., ...
break
when "\177", "\b" # Ctrl-H, Bkspace
if password.length > 0
password[-1] = ' '
password.slice!(-1, 1)
end
when "\004" # Ctrl-D
password.length.times do |i|
password[i] = ' '
end
password = ''
else
password << passwd_chr
end
end
$stderr.puts
passwd
end
def ask(prompt = "Enter password: ")
%w|windows unix jruby|.each do |platform|
eval "return ask_for_password_on_#{platform}(prompt) if #{platform}?"
end
raise "Could not read password on unknown Ruby platform: #{RUBY_DESCRIPTION}"
end
end
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