Add embed/info endpoint for TopicEmbed queries

app/controllers/embed_controller.rb

@@ -1,6 +1,8 @@
 class EmbedController < ApplicationController
   skip_before_filter :check_xhr, :preload_json, :verify_authenticity_token
-  before_filter :ensure_embeddable
+
+  before_filter :ensure_embeddable, except: [ :info ]
+  before_filter :ensure_api_request, only: [ :info ]
 
   layout 'embed'
 
@@ -35,6 +37,15 @@ class EmbedController < ApplicationController
     discourse_expires_in 1.minute
   end
 
+  def info
+    embed_url = params.require(:embed_url)
+    @topic_embed = TopicEmbed.where(embed_url: embed_url).first
+
+    raise Discourse::NotFound if @topic_embed.nil?
+
+    render_serialized(@topic_embed, TopicEmbedSerializer, root: false)
+  end
+
   def count
     embed_urls = params[:embed_url]
     by_url = {}
@@ -55,6 +66,10 @@ class EmbedController < ApplicationController
 
   private
 
+    def ensure_api_request
+      raise Discourse::InvalidAccess.new('api key not set') if !is_api?
+    end
+
     def ensure_embeddable
 
       if !(Rails.env.development? && current_user.try(:admin?))

app/serializers/topic_embed_serializer.rb

@@ -0,0 +1,15 @@
+class TopicEmbedSerializer < ApplicationSerializer
+  attributes \
+    :topic_id,
+    :post_id,
+    :topic_slug,
+    :comment_count
+
+  def topic_slug
+    object.topic.slug
+  end
+
+  def comment_count
+    object.topic.posts_count - 1
+  end
+end

config/routes.rb

@@ -441,6 +441,7 @@ Discourse::Application.routes.draw do
 
   get 'embed/comments' => 'embed#comments'
   get 'embed/count' => 'embed#count'
+  get 'embed/info' => 'embed#info'
 
   get "new-topic" => "list#latest"
 

spec/controllers/embed_controller_spec.rb

@@ -29,6 +29,40 @@ describe EmbedController do
     end
   end
 
+  context ".info" do
+    context "without api key" do
+      it "fails" do
+        get :info, format: :json
+        expect(response).not_to be_success
+      end
+    end
+
+    context "with api key" do
+
+      let(:api_key) { ApiKey.create_master_key }
+
+      context "with valid embed url" do
+        let(:topic_embed) { Fabricate(:topic_embed, embed_url: embed_url) }
+
+        it "returns information about the topic" do
+          get :info, format: :json, embed_url: topic_embed.embed_url, api_key: api_key.key, api_username: "system"
+          json = JSON.parse(response.body)
+          expect(json['topic_id']).to eq(topic_embed.topic.id)
+          expect(json['post_id']).to eq(topic_embed.post.id)
+          expect(json['topic_slug']).to eq(topic_embed.topic.slug)
+        end
+      end
+
+      context "without invalid embed url" do
+        it "returns error response" do
+          get :info, format: :json, embed_url: "http://nope.com", api_key: api_key.key, api_username: "system"
+          json = JSON.parse(response.body)
+          expect(json["error_type"]).to eq("not_found")
+        end
+      end
+    end
+  end
+
   context "with a host" do
     let!(:embeddable_host) { Fabricate(:embeddable_host) }
 

spec/fabricators/topic_embed_fabricator.rb

@@ -0,0 +1,4 @@
+Fabricator(:topic_embed) do
+  post
+  topic {|te| te[:post].topic }
+end