#1866: support doujinantena source redirection

brings the user to the front/1st page of the doujin similar when viewing manga in pixiv

app/models/post.rb

@@ -342,6 +342,9 @@ class Post < ActiveRecord::Base
 
       when %r{\Ahttp://jpg\.nijigen-daiaru\.com/(\d+)}i
         "http://nijigen-daiaru.com/book.php?idb=#{$1}"
+        
+      when %r{\Ahttps?://sozai\.doujinantena\.com/contents_jpg/([a-f0-9]{32})/}i
+        "http://doujinantena.com/page.php?id=#{$1}"
 
       when %r{\Ahttp://rule34-(?:data-\d{3}|images)\.paheal\.net/(?:_images/)?([a-f0-9]{32})}i
         "http://rule34.paheal.net/post/list/md5:#{$1}/1"