Remote fetching of blog contents

app/assets/javascripts/discourse/models/post.js

@@ -183,8 +183,8 @@ Discourse.Post = Discourse.Model.extend({
   **/
   expand: function() {
     var self = this;
-    return Discourse.ajax("/posts/" + this.get('id') + "/expand-embed").then(function(result) {
-      self.set('cooked', result.cooked);
+    return Discourse.ajax("/posts/" + this.get('id') + "/expand-embed").then(function(post) {
+      self.set('cooked', post.cooked);
     });
   },
 

app/controllers/posts_controller.rb

@@ -144,7 +144,13 @@ class PostsController < ApplicationController
   end
 
   def expand_embed
-    render json: {cooked: "NEW COOKED CONTENT"}
+    post = find_post_from_params
+    content = Rails.cache.fetch("embed-topic:#{post.topic_id}", expires_in: 10.minutes) do
+      url = TopicEmbed.where(topic_id: post.topic_id).pluck(:embed_url).first
+      doc = TopicEmbed.find_remote(url)
+      doc.content
+    end
+    render json: {cooked: content}
   end
 
   def recover

app/models/topic_embed.rb

@@ -56,15 +56,18 @@ class TopicEmbed < ActiveRecord::Base
     post
   end
 
-  def self.import_remote(user, url, opts=nil)
+  def self.find_remote(url)
     require 'ruby-readability'
 
     url = normalize_url(url)
-    opts = opts || {}
-    doc = Readability::Document.new(open(url).read,
+    Readability::Document.new(open(url).read,
                                         tags: %w[div p code pre h1 h2 h3 b em i strong a img ul li ol],
                                         attributes: %w[href src])
+  end
 
+  def self.import_remote(user, url, opts=nil)
+    opts = opts || {}
+    doc = find_remote(url)
     TopicEmbed.import(user, url, opts[:title] || doc.title, doc.content)
   end