add #387 PodcastsConnect のRSSタグ追加

追加のタグは必須ではないのですが、Apple Podcastsでおすすめとして紹介されやすくなるようなので追加しました。

cf. https://help.apple.com/itc/podcasts_connect/#/itcb54353390

Author: odlovesq

app/controllers/podcasts_controller.rb

@@ -16,8 +16,9 @@ def show
   end
 
   def feed
-    @episodes   = Podcast.all.sort_by{|episode| episode.filename.rjust(3, '0')}
+    @episodes   = Podcast.all.sort_by{|episode| episode.published_at}
     @domainname = request.base_url
+    @author     = "一般社団法人 CoderDojo Japan"
     respond_to do |format|
       format.rss { render :layout => false }
     end

app/models/podcast.rb

@@ -36,6 +36,10 @@ def description
     @desc  ||= exists? ? self.content.lines.reject{|l| l =~ /^(\n|<)/ }.second.delete('<br>').strip : ''
   end
 
+  def published_at
+    @pubDate ||= exists? ? Time.parse(self.content.lines.second.gsub(/<.+?>/, '').delete('収録日: ')) : ''
+  end
+
   def content
     @content ||= exists? ? File.read(path) : ''
   end

app/views/podcasts/feed.rss.builder

@@ -1,17 +1,30 @@
 xml.instruct! :xml, :version => "1.0"
-xml.rss :version => "2.0" do
+xml.rss :version => "2.0", "xmlns:itunes" => "http://www.itunes.com/dtds/Podcast-1.0.dtd" do
   xml.channel do
     xml.title full_title ""
     xml.description full_description ""
     xml.link root_url
+    xml.author @author
+    xml.copyright "Copyright © 2012-2018 一般社団法人 CoderDojo Japan"
+    xml.language "ja"
+    xml.itunes :category, :text => "Technology" do
+      xml.itunes :category, :text => "Software How-To"
+      xml.itunes :category, :text => "Podcasting"
+    end
+    xml.itunes :type, "serial"
+    xml.itunes :explicit, "clean"
 
     @episodes.each do |episode|
       xml.item do
         xml.title episode.title
+        xml.author @author
         xml.description episode.description
-        xml.link @domainname + episode.url + ".mp3"
+        xml.link @domainname + episode.url
         xml.guid({:isPermaLink => "false"}, @domainname + episode.url)
+        xml.itunes :explicit, "clean"
+        xml.pubDate episode.published_at.rfc2822
+        xml.enclosure({:url => @domainname + episode.url + ".mp3", :type => "audio/mpeg"})
       end
     end
   end
-end
+end