module ContentType

  CONTENT_TYPE = {:video=>%w{video/3gpp video/avi video/divx video/mp4 video/mpeg
                   video/quicktime video/x-flv video/x-m4v video/x-mpeg video/x-msvideo
                   video/x-ms-wmv application/x-flash-video },

                  :audio=>%w{audio/m4a audio/mp3 audio/mpeg audio/mpeg3 audio/mpegurl
                             audio/mpg audio/wav audio/x-aiff audio/x-m4a audio/x-mp3
                             audio/x-mpeg audio/x-ms-wma },

                  :image=>%w{image/bmp image/gif image/jpeg image/jpg image/pict
                             image/pjpeg image/png image/tiff image/x-bmp
                             image/x-photoshop image/x-png },

                  :text=>%w{text/html text/plain text/xml },

                  :application=>%w{application/download application/force-download
                                   application/msword application/pdf
                                   application/save-as application/vnd.ms-powerpoint
                                   application/vnd.ms-wpl
                           application/vnd.openxmlformats-officedocument.wordprocessingml.document
                                   application/x-download application/x-ms-wmv
                                   application/x-photoshop application/x-shockwave-flash
                                   application/x-unknown application/x-zip-compressed
                                   application/zip },

                  :unknown=>%w{application/octect-stream application/octet-stream unknown/unknown }
                  }

  def self.included(base)
    base.class_eval do
      alias_method :content_type_selector, :cts
    end
  end

  def self.content_type_selector(type=nil)
    return CONTENT_TYPE[type] if CONTENT_TYPE.has_key?(type)
    return CONTENT_TYPE
  end
end