main.rb

require 'open-uri'
require 'net/http'

URL = 'bucket_url'
DIGITS_AND_LETTERS = (0..9).to_a.concat(('a'..'z').to_a)

count = 0

DIGITS_AND_LETTERS.repeated_permutation(32) do |num|
    begin
        %w(extensions_array).each do |file_extension|
            response = Net::HTTP.get_response(URI("#{URL}#{num.join}#{file_extension}"))
            puts URI("#{URL}#{num.join}#{file_extension}")
            if response.code == '200'
                download = open("#{URL}#{FILE}#{file_extension}")
                IO.copy_stream(download, "./files/#{num.join}#{file_extension}")
                count += 1
                puts "#{count} hits!!!!!!"
            end
        end
    rescue => e
        puts e
    end
end