Funciones varias para extraer y validar info de youtube y crear thumbnails personalizados.

youtube_adapter.rb

class YoutubeAdapter

  def self.get_thumbnail(entry, size)
    video_id = get_video_id entry.embed
    case size
      when 0  then  "http://img.youtube.com/vi/#{video_id}/0.jpg"
      when 1  then  "http://img.youtube.com/vi/#{video_id}/1.jpg"
    end
  end

  def self.get_video_id(embed_code)
    urls = URI.extract embed_code
    url_regex = Regexp.new("((https?|ftp|file):((//)|(\\\\))+[\w\d:\#@%/;$()~_?\+-=\\\\.&]*)")

    if urls.blank?
      return false
    else
      urls.each do |url|
        unless (url =~ url_regex).nil?
          url_data = URI.parse url
          if url_data.host.present? && (url_data.host.include? "youtube.com")
            return url_data.path.split('/')[2].split('&')[0]
            break
          else
            return nil
            break
          end
        end
      end
    end
  end

  def self.is_youtube_video?(code)
    urls = URI.extract code
    url_regex = Regexp.new("((https?|ftp|file):((//)|(\\\\))+[\w\d:\#@%/;$()~_?\+-=\\\\.&]*)")

    if urls.blank?
      return false
    else
      urls.each do |url|
        unless (url =~ url_regex).nil?
          url_data = URI.parse url
          if url_data.host.present? && (url_data.host.include? "youtube.com")
            return true
            break
          else
            return false
            break
          end
        end
      end
    end
  end


  def self.make_thumbnail(entry)
    thumbnail_url = get_thumbnail(entry, 0)
    #thumbnail_local_path = download_thumbnail(thumbnail_url)
    thumbnail_file = add_play_button(thumbnail_url)
    thumbnail_file
  end

  def self.download_thumbnail(url)
    image_file = Tempfile.new("temp_image")
    image_file.write(open(url).read)
    image_file.close
    image_file.path
  end

  def self.add_play_button(image_url)
    image = Magick::ImageList.new(image_url)
    play_image = Rails.root.join('public', 'images', 'icons', 'play-x100.png')
    play_overlay = Magick::ImageList.new(play_image)
    image.gravity = Magick::CenterGravity
    video_image = image.composite_layers(play_overlay, Magick::OverCompositeOp)
    video_image.format = "jpeg"
    final_image = Tempfile.new("youthumb")
    video_image.write final_image.path
    image_file = File.open(final_image.path, 'rb')
    image_file
    # entry.update_attribute(:image, File.open(final_image.path, 'rb'))
  end

end