nokogiri_rake.rb

desc "Parse picasa photo feed."
task :parse do

require 'dm-core'
require 'open-uri'
require 'nokogiri'

  config = File.open(Pathname(Sinatra::Application.root)/"config/picasa.yml") { |file| YAML.load(file) }
  picasa = Picasa.new
  picasa.login(config['credentials']['email'], config['credentials']['password'])

  @albums = [] 
  albums = Nokogiri::XML(open("http://picasaweb.google.com/data/feed/api/user/#{picasa.user_id}?kind=album&access=private", "Authorization" => "GoogleLogin auth=#{picasa.auth_key}", 'GData-Version' => '2'))
  albums.xpath("//xmlns:entry").each do |entry|

    album = Hash.new

    entry.children.each do |a|
      case "#{a.namespace.prefix}:#{a.node_name}"
      when ":title"
        album["title"] = a.content
      when "gphoto:id"
        album["id"] = a.content
      end
    end

    @albums << album
  end
  albums_id = @albums.map{|item| item.values_at("id")}.flatten

  @images = []

  albums_id.each do |album_id|
    config = File.open(Pathname(Sinatra::Application.root)/"config/picasa.yml") { |file| YAML.load(file) }
    doc = Nokogiri::XML(open("http://picasaweb.google.com/data/feed/api/user/#{picasa.user_id}/albumid/#{album_id}?kind=photo&thumbsize=#{config['options']['thumb_size']}&imgmax=#{config['options']['max_size']}", "Authorization" => "GoogleLogin auth=#{picasa.auth_key}", 'GData-Version' => '2'))  
    doc.remove_namespaces!

    doc.xpath("//entry").each do |entry|
      entry.children.each do |n|
        if n.node_name == "group"

          image = Hash.new

          n.children.each do |g|
            case g.node_name
            when "description"
              image["description"] = g.content
            when "content"
              image["content"] = g.attribute("url")
            when "thumbnail"
              image["thumbnail"] =  g.attribute("url")
            end
          end

          @images << image
        end
      end
    end
  end
  @images.each do |image|
    as = Photo.new
    as.attributes = image
    as.save
  end
end