API: return post oEmbed data

app/presenters/post_presenter.rb

@@ -34,7 +34,8 @@ class PostPresenter < BasePresenter
       photos:                build_photos_json,
       root:                  root_api_response,
       own_interaction_state: build_own_interaction_state,
-      open_graph_object:     open_graph_object_api_response
+      open_graph_object:     open_graph_object_api_response,
+      oembed:                @post.o_embed_cache.try(:data)
     }.compact
   end
 

lib/schemas/api_v1.json

@@ -328,6 +328,15 @@
           },
           "required": ["url", "type", "title", "image"],
           "additionalProperties": false
+        },
+        "oembed": {
+          "type": "object",
+          "description": "An oEmbed response according to 2.3.4 of the oEmbed spec.",
+          "properties": {
+            "trusted_endpoint_url": { "type": "string" }
+          },
+          "required": ["trusted_endpoint_url"],
+          "additionalProperties": true
         }
       },
       "required": ["guid", "created_at", "title", "body", "public", "nsfw", "author", "interaction_counters", "own_interaction_state",  "mentioned_people", "photos"]

spec/factories.rb

@@ -292,7 +292,12 @@ FactoryGirl.define do
 
   factory(:o_embed_cache) do
     url "http://youtube.com/kittens"
-    data {{'data' => 'foo'}}
+    data {
+      {
+        "data"                 => "foo",
+        "trusted_endpoint_url" => "https://www.youtube.com/oembed?scheme=https"
+      }
+    }
   end
 
   factory(:open_graph_cache) do

spec/integration/api/posts_controller_spec.rb

@@ -88,6 +88,7 @@ describe Api::V1::PostsController do
         merged_params = merged_params.merge(photos: @alice_photo_ids)
         status_message = StatusMessageCreationService.new(alice).create(merged_params)
         status_message.open_graph_cache = FactoryGirl.create(:open_graph_cache, video_url: "http://example.org")
+        status_message.o_embed_cache = FactoryGirl.create(:o_embed_cache)
         status_message.save
 
         get(
@@ -696,6 +697,7 @@ describe Api::V1::PostsController do
     confirm_location(post["location"], reference_post.location) if reference_post.location
     confirm_photos(post["photos"], reference_post.photos) if reference_post.photos
     confirm_open_graph_object(post["open_graph_object"], reference_post.open_graph_cache)
+    confirm_oembed(post["oembed"], reference_post.o_embed_cache)
   end
 
   def confirm_post_top_level(post, reference_post)
@@ -773,6 +775,13 @@ describe Api::V1::PostsController do
     expect(object["video_url"]).to eq(ref_cache.video_url)
   end
 
+  def confirm_oembed(response, ref_cache)
+    return unless ref_cache
+
+    expect(response).to eq(ref_cache.data)
+    expect(response["trusted_endpoint_url"]).to_not be_nil
+  end
+
   def confirm_reshare_format(post, root_post, root_poster)
     root = post["root"]
     expect(root.has_key?("guid")).to be_truthy