FIX: extract links in post processor

when oneboxes are not cached or are refreshed they can introduce new
links, these links must be extracted otherwise you can not follow them

lib/cooked_post_processor.rb

@@ -29,9 +29,16 @@ class CookedPostProcessor
       optimize_urls
       pull_hotlinked_images(bypass_bump)
       grant_badges
+      extract_links
     end
   end
 
+  # onebox may have added some links, so extract them now
+  def extract_links
+    TopicLink.extract_from(@post)
+    QuotedPost.extract_from(@post)
+  end
+
   def has_emoji?
     (@doc.css("img.emoji") - @doc.css(".quote img")).size > 0
   end

spec/components/cooked_post_processor_spec.rb

@@ -478,6 +478,15 @@ describe CookedPostProcessor do
 
   end
 
+  context "extracts links" do
+      let(:post) { Fabricate(:post, raw: "sam has a blog at https://samsaffron.com") }
+      it "always re-extracts links on post process" do
+        TopicLink.destroy_all
+        CookedPostProcessor.new(post).post_process
+        expect(TopicLink.count).to eq(1)
+      end
+  end
+
   context "grant badges" do
     context "emoji inside a quote" do
       let(:post) { Fabricate(:post, raw: "time to eat some sweet [quote]:candy:[/quote] mmmm") }

spec/components/post_creator_spec.rb

@@ -150,8 +150,9 @@ describe PostCreator do
       end
 
       it 'extracts links from the post' do
-        TopicLink.expects(:extract_from).with(instance_of(Post))
+        create_post(raw: "this is a link to the best site at https://google.com")
         creator.create
+        expect(TopicLink.count).to eq(1)
       end
 
       it 'queues up post processing job when saved' do

spec/controllers/posts_controller_spec.rb

@@ -387,8 +387,12 @@ describe PostsController do
       end
 
       it "extracts links from the new body" do
-        TopicLink.expects(:extract_from).with(post)
-        xhr :put, :update, update_params
+        param = update_params
+        param[:post][:raw] =  'I just visited this https://google.com so many cool links'
+
+        xhr :put, :update, param
+        expect(response).to be_success
+        expect(TopicLink.count).to eq(1)
       end
 
       it "doesn't allow updating of deleted posts" do