Recommend posts on /posts/show based on voting patterns

app/models/recommender_service.rb

@@ -0,0 +1,26 @@
+module RecommenderService
+  extend self
+
+  def enabled?
+    Danbooru.config.recommender_server.present?
+  end
+
+  def available?(post)
+    enabled? && CurrentUser.id == 1 && post.created_at > 6.months.ago && post.score >= 10
+  end
+
+  def similar(post)
+    Cache.get("rss:#{post.id}", 1.day) do
+      resp = HTTParty.get(
+        "#{Danbooru.config.recommender_server}/similar/#{post.id}", 
+        Danbooru.config.httparty_options.merge(
+          basic_auth: {
+            username: "danbooru", 
+            password: Danbooru.config.recommender_key
+          }
+        )
+      )
+      JSON.parse(resp.body)
+    end
+  end
+end