module Robotron

# File lib/robotron.rb, line 3
def call(env)
  body = File.read(robots_path)

  [200, default_headers, [body]]
rescue Errno::ENOENT
  [200, default_headers, [default_body]]
end

# File lib/robotron.rb, line 23
def default_body
  "User-Agent: *\nDisallow: /"
end

# File lib/robotron.rb, line 27
def default_headers
  {
    'Content-Type' => 'text/plain',
    'Cache-Control' => 'public, max-age=31557600'
  }
end

# File lib/robotron.rb, line 11
def environment
  ENV['RACK_ENV'] || 'development'
end

# File lib/robotron.rb, line 15
def robots_directory
  defined?(Rails) ? Rails.root.join('config') : File.join('spec')
end

# File lib/robotron.rb, line 19
def robots_path
  File.join(robots_directory, "robots.txt.#{ environment }")
end