#!/usr/bin/ruby
require "net/http"
require "json"

$rpc_pass = "rpc-pass"
words = ['pass1', 'pass2', 'pass3', 'pass4']
max_words = 4

def test(passphrase)
  puts passphrase.inspect
  request = Net::HTTP::Post.new("/")
  request.basic_auth "", $rpc_pass
  request.body = { method:"walletpassphrase", params:[passphrase, 1] }.to_json
  response = Net::HTTP.new("localhost", 8332).request(request)
  if response.code == "401" ; puts "Incorrect RPC user/pass" ; exit 1 ; end
  ret = JSON.parse response.body
  if ret["error"].nil? ; puts "\nFound it! #{passphrase.inspect}" ; exit ; end
  return if ret["error"]["code"] == -14 # wrong passphrase
  raise "WTF? #{ret.inspect}"
end

(1..max_words).each do |n_words|
  words.repeated_permutation(n_words).each { |p| test p.join }
end

puts "No luck."