Simple YouTube embedment with alternate source for Jekyll

youtube_gfw.rb

# Title: Simple YouTube embedment with alternate source for Jekyll
# Author: Zhantong Zhang http://zhantong.org
# Description: Easily output embeded YouTube video with a backup inside GFW (Tudou).
# Use: Put this file in plugins/ and youtubeCN.js in source/javascripts
#
# Syntax {% ytb youtube/id [width height] [autopage] [tudou/id] %}

module Jekyll

  class YtbGFW < Liquid::Tag

    @width = ''
    @height = ''
    @autoplay = 0
    @id = ''
    @td_id = ''

    def initialize(tag_name, markup, tokens)
      super
      parameters = markup.split(" ")
      @id = parameters.first
      @td_id = parameters.last
      @width = parameters[1]
      @height = parameters[2]
      @config = 
      @root_url = Jekyll.configuration({})['url']
      if parameters[1] =~ /^\d+$/
        if parameters[2] =~ /^\d+$|^\d+px$|^\d+%$/
          @autoplay = parameters[3]
        else
          @autoplay = parameters[1]
        end
      end
    end

    def render(context)
      if @td_id != @id
        %(<div class="embed-video-container" width="#{@width}" id="yt"><iframe id="ytplayer" type="text/html" width="#{@width}" src="http://www.youtube.com/embed/#{@id}?autoplay=#{@autoplay}&origin=http://blog.zhantong.org" frameborder="0"></iframe></div><div class="embed-video-container flash-video" id="td"><iframe id="tdplayer" src="http://www.tudou.com/programs/view/html5embed.action?code=#{@td_id}&resourceId=356292153_06_05_99" allowtransparency="true" scrolling="no" border="0" frameborder="0" style="width:#{@width};"></iframe></div><script src="#{@root_url}/javascripts/youtubeCN.js" type="text/javascript"></script>)
      else
        %(<div class="embed-video-container" id="yt" width="#{@width}><iframe id="ytplayer" type="text/html" width="#{@width}" src="http://www.youtube.com/embed/#{@id}?autoplay=#{@autoplay}&origin=http://blog.zhantong.org" frameborder="0"></iframe></div><script src="#{@root_url}/javascripts/youtubeCN.js" type="text/javascript"></script>)
      end
    end
  
  end

end
 
Liquid::Template.register_tag('ytb', Jekyll::YtbGFW)

youtubeCN.js

// put it in source/javascripts/ directory
var icon = "http://s.ytimg.com/yts/img/favicon-vfldLzJxy.ico";
var locationWall = (! $('<img src="'+ icon +'">').load()); // false if out of Mainland; true otherwise
var plid="td"; // remove tudou if outside of Mainland
if(locationWall)
{
plid="yt" // remove youtube if inside of Mainland
}
var player=document.getElementById(plid);
player.parentNode.removeChild(player);