# File referrercop, line 472
def self.spam?(url)
  @cache.fetch(url) do |url|
    @whitelist.each do |pattern|
      return @cache[url] = false if url =~ pattern
    end

    @blacklist.each do |pattern|
      return @cache[url] = true if url =~ pattern
    end

    return @cache[url] = false
  end
end