rack_konami.rb

module Rack 
  class Konami
    
    KONAMI_CODE = <<-EOTC 
    <div id="rack_konami" style="display:none;position:fixed;top:20%;right:50%;">
      {{HTML}}
    </div>
    <script type="text/javascript">
    var Konami=function(){var a={addEvent:function(b,c,d,e){if(b.addEventListener)b.addEventListener(c,d,false);else if(b.attachEvent){b["e"+c+d]=d;b[c+d]=function(){b["e"+c+d](window.event,e)};b.attachEvent("on"+c,b[c+d])}},input:"",pattern:"3838404037393739666513",load:function(b){this.addEvent(document,"keydown",function(c,d){if(d)a=d;a.input+=c?c.keyCode:event.keyCode;if(a.input.length>a.pattern.length)a.input=a.input.substr(a.input.length-a.pattern.length);if(a.input==a.pattern){a.code(b);a.input=
    ""}},this);this.iphone.load(b)},code:function(b){window.location=b},iphone:{start_x:0,start_y:0,stop_x:0,stop_y:0,tap:false,capture:false,orig_keys:"",keys:["UP","UP","DOWN","DOWN","LEFT","RIGHT","LEFT","RIGHT","TAP","TAP","TAP"],code:function(b){a.code(b)},load:function(b){orig_keys=this.keys;a.addEvent(document,"touchmove",function(c){if(c.touches.length==1&&a.iphone.capture==true){c=c.touches[0];a.iphone.stop_x=c.pageX;a.iphone.stop_y=c.pageY;a.iphone.tap=false;a.iphone.capture=false;a.iphone.check_direction()}});
    a.addEvent(document,"touchend",function(){a.iphone.tap==true&&a.iphone.check_direction(b)},false);a.addEvent(document,"touchstart",function(c){a.iphone.start_x=c.changedTouches[0].pageX;a.iphone.start_y=c.changedTouches[0].pageY;a.iphone.tap=true;a.iphone.capture=true})},check_direction:function(b){x_magnitude=Math.abs(this.start_x-this.stop_x);y_magnitude=Math.abs(this.start_y-this.stop_y);x=this.start_x-this.stop_x<0?"RIGHT":"LEFT";y=this.start_y-this.stop_y<0?"DOWN":"UP";result=x_magnitude>y_magnitude?
    x:y;result=this.tap==true?"TAP":result;if(result==this.keys[0])this.keys=this.keys.slice(1,this.keys.length);if(this.keys.length==0){this.keys=this.orig_keys;this.code(b)}}}};return a};
    </script>
    <script type="text/javascript">
    	konami = new Konami()
    	konami.code = function() {
        $('#rack_konami').fadeIn('slow').delay({{DELAY}}).fadeOut('slow');
      }
    	konami.load()
    </script>
    EOTC
    
    def initialize(app, options = {})
      @app = app
      @html = options[:html] || "<h1>Konami Code</h1>"
      @delay = options[:delay] || 1000
    end
    
    def call(env)
      dup._call(env)
    end
    
    def _call(env)
      
      @status, @headers, @response = @app.call(env)
      return [@status, @headers, @response] unless @headers['Content-Type'] =~ /html/

      @headers.delete('Content-Length')
      response = Rack::Response.new([], @status, @headers)
      @response.each do |fragment|
        response.write(inject_konami(fragment))
      end
      response.finish
    end
    
    def inject_konami(response)
        response.sub!(/<\/body>/, "#{substitute_vars}\n</body>")
    end
    
    private
    
    def substitute_vars
      KONAMI_CODE.sub(/\{\{HTML\}\}/, @html).sub!(/\{\{DELAY\}\}/, @delay.to_s)
    end
    
  end
  
end