Hackthisite Programming 2 (Requires Mechanize and RMagick gems) -- Autocompletion

main.rb

#!/usr/bin/ruby
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require_relative 'morse.rb'
require 'mechanize'
require 'RMagick'
require 'io/console'

print 'Username: '
name = gets.chomp
print 'Password: '
pass = STDIN.noecho(&:gets).chomp

client = Mechanize.new { |agent| agent.user_agent = 'Mechanize -- Ninjex' }
client.get('https://www.hackthissite.org/') do |page|
  login_form = client.click(page.link_with(:text => /Login/))
  login_page = login_form.form_with(:action => '/user/login') do |f|
    f.username = name
    f.password = pass
  end.click_button
end

client.get('https://www.hackthissite.org/missions/prog/2/') do |page|
  client.get('https://www.hackthissite.org/missions/prog/2/PNG').save('encrypted.png')
  img = Magick::Image::read("encrypted.png")[0]
  offset, count = [], 0
  img.each_pixel do |pixel|
    if pixel.to_s.include?('red=65535, green=65535, blue=65535')
      offset << count
      count = 0
    end
    count += 1
  end
  answer = decrypt_morse(offset.map!(&:chr).join)
  submit_form = page.form_with(:action => '/missions/prog/2/index.php') { |f| f.solution = answer }.click_button
  puts "\r\nSubmited Answer: #{answer}"
  puts "Verify points @ https://www.hackthissite.org/user/view/#{name}"
end
File.delete('encrypted.png')

morse.rb

def decrypt_morse(cipher)
  morse = {
    ".-" => 'A',      "-..." => 'B',    "-.-." => 'C',    "-.." => 'D', 
    "." => 'E',       "..-." => 'F',    "--." => 'G',     "...." => 'H',
    ".." => 'I',      ".---" => 'J',    "-.-" => 'K',     ".-.." => 'L', 
    "--" => 'M',      "-." => 'N',      "---" => 'O',     ".--." => 'P',
    "--.-" => 'Q',    ".-." => 'R',     "..." => 'S',     "-" => 'T',
    "..-" => 'U',     "...-" => 'V',    ".--" => 'W',     "-..-" => 'X',
    "-.--" => 'Y',    "--.." => 'Z',    ".----" => '1',   "..---" => '2', 
    "...--" => '3',   "....-" => '4',   "....." => '5',   "-...." => '6', 
    "--..." => '7',   "---.." => '8',   "----." => '9',   "-----" => '0',
    '/' => ' ',
  }
  plain = []
  cipher.split(' ').map{ |crypt| plain << morse[crypt] }
  return plain.join
end