a horrific attempt at brute forcing technika 3 album art URLs, could probably be greatly improved, uses repeated_permutation which requires ruby 1.9.x

t3_bruteforce.rb

require 'uri'
require 'net/http'

def url_for_songname(songname)
  "http://img3.platinumcrew.co.kr/icon/disc/110/#{songname}_1.png"
end

def all_possibilities_for_this_many_characters(c)
  char_seq = []
  (97..122).each do |charcode| # letters
    char_seq << charcode.chr
  end
  (48..57).each do |charcode| # numbers
    char_seq << charcode.chr
  end
  return char_seq.repeated_permutation(c).to_a.map { |p|
    p.join
  }
end

def song_validity_test(url)
  uri = URI.parse(url)
  result = Net::HTTP.start(uri.host, uri.port) { |http| http.get(uri.path) }
  puts url if result.code == "200"
end


(2..25).each do |c|
  puts ":: trying song name possibilities with #{c} characters..."
  possibilities = all_possibilities_for_this_many_characters(c)
  possibilities.each do |songname|
    song_validity_test(url_for_songname(songname))
  end
end