try adding youtube download links

doesn't work for some videos, should probably delegate to youtube-dl

see jeckman/YouTube-Downloader#9

config/application.rb

@@ -10,6 +10,7 @@
 require "sprockets/railtie"
 require "rails/test_unit/railtie"
 require_relative "../lib/services/html_title"
+require_relative "../lib/services/youtube_video"
 
 # Require the gems listed in Gemfile, including any gems
 # you've limited to :test, :development, or :production.
@@ -36,6 +37,7 @@ class Application < Rails::Application
 
     config.after_initialize do 
       Flavours.add HtmlTitle
+      Flavours.add YoutubeVideo
     end
 
   end

lib/services/html_title.rb

@@ -7,13 +7,12 @@ class HtmlTitle
   @queue = :flavours
 
   def self.get_attrs(url)
-    puts "loading #{url} ..."
+    #puts "loading #{url} ..."
     page = Nokogiri::HTML(open(url))
-    puts "got title #{page.css("title")}"
+    #puts "got title #{page.css("title")}"
     {html_title: page.css("title").text}
   rescue Exception => e
     puts e
-    puts e.message
     raise
   end
 end

lib/services/youtube_video.rb

@@ -0,0 +1,40 @@
+require_relative "flavours"
+require "rack"
+
+class YoutubeVideo
+  extend FlavourWorker
+  @queue = :flavours
+
+  def self.get_attrs(url)
+    uri = URI.parse url
+    return {} if not is_youtube(uri)
+    params = decode_qs(uri.query)
+    video_id = params["v"]
+    #puts video_id
+    return {} if not video_id
+    video_info_url = "http://www.youtube.com/get_video_info?video_id="+video_id
+    #puts video_info_url
+    video_info_str = Net::HTTP.get_response(URI.parse(video_info_url)).body
+    video_info = decode_qs(video_info_str)
+    fmt_stream_map = video_info["url_encoded_fmt_stream_map"].split(",").map {|s| decode_qs(s)}
+    #puts fmt_stream_map
+
+    #puts video_info
+    {
+      youtube_video_title: video_info["title"],
+      youtube_video_author: video_info["author"],
+      youtube_video_dl: fmt_stream_map.first["url"],
+    }
+  end
+
+  private
+  def self.is_youtube(uri)
+    uri.host == "youtube.com" ||
+      uri.host == "www.youtube.com" ||
+      uri.host == "youtu.be"
+  end
+
+  def self.decode_qs(qs) 
+    Rack::Utils.parse_nested_query(qs)
+  end
+end

spec/services/youtube_video_spec.rb

@@ -0,0 +1,35 @@
+require_relative "../../lib/services/youtube_video"
+require_relative "../../app/models/drop"
+
+describe YoutubeVideo do
+  let (:url) { "a-url" }
+  let (:drop) { Drop.new(url: url) }
+
+  before do
+    allow(Drop).to receive(:find).with(:id).and_return(drop)
+  end
+
+  it "should accept drop id in perform method" do
+    allow(YoutubeVideo).to receive(:get_attrs).and_return({})
+    expect(YoutubeVideo.perform(:id)).not_to be_nil
+  end
+
+  it "should ignore non-youtube urls" do
+    expect(YoutubeVideo.get_attrs("http://google.com")).to eq({})
+  end
+
+  it "should add video title to attrs", :vcr, record: :new_episodes do
+    expect(YoutubeVideo.get_attrs("https://www.youtube.com/watch?v=9bZkp7q19f0")).to \
+      include(youtube_video_title: "PSY - GANGNAM STYLE (강남스타일) M/V")
+  end
+
+  it "should add video author to attrs", :vcr, record: :new_episodes do 
+    expect(YoutubeVideo.get_attrs("https://www.youtube.com/watch?v=9bZkp7q19f0")).to \
+      include(youtube_video_author: "officialpsy")
+  end
+
+  it "should add video download link to attrs", :vcr, record: :new_episodes do
+    expect(YoutubeVideo.get_attrs("https://www.youtube.com/watch?v=9bZkp7q19f0")).to \
+      include(:youtube_video_dl)
+  end
+end