Web.MastodonAPI.MastodonAPIController: Add Rich-Media support

lib/pleroma/web/mastodon_api/mastodon_api_controller.ex

@@ -1322,6 +1322,29 @@ def suggestions(%{assigns: %{user: user}} = conn, _) do
     end
   end
 
+  defp status_first_external_url(content) do
+    content
+    |> Floki.filter_out("a.mention")
+    |> Floki.attribute("a", "href")
+    |> Enum.at(0)
+  end
+
+  def status_card(conn, %{"id" => status_id}) do
+    with %Activity{} = activity <- Repo.get(Activity, status_id),
+         true <- ActivityPub.is_public?(activity),
+         page_url <- status_first_external_url(activity.data["object"]["content"]),
+         {:ok, rich_media} <- Pleroma.Web.RichMedia.Parser.parse(page_url) do
+      card =
+        rich_media
+        |> Map.take([:image, :title, :url, :description])
+        |> Map.put(:type, "link")
+
+      json(conn, card)
+    else
+      _ -> json(conn, %{})
+    end
+  end
+
   def try_render(conn, target, params)
       when is_binary(target) do
     res = render(conn, target, params)

lib/pleroma/web/router.ex

@@ -258,7 +258,7 @@ defmodule Pleroma.Web.Router do
 
     get("/statuses/:id", MastodonAPIController, :get_status)
     get("/statuses/:id/context", MastodonAPIController, :get_context)
-    get("/statuses/:id/card", MastodonAPIController, :empty_object)
+    get("/statuses/:id/card", MastodonAPIController, :status_card)
     get("/statuses/:id/favourited_by", MastodonAPIController, :favourited_by)
     get("/statuses/:id/reblogged_by", MastodonAPIController, :reblogged_by)
 

test/web/mastodon_api/mastodon_api_controller_test.exs

@@ -1623,5 +1623,21 @@ test "max pinned statuses", %{conn: conn, user: user, activity: activity_one} do
                |> post("/api/v1/statuses/#{activity_two.id}/pin")
                |> json_response(400)
     end
+
+    test "Status rich-media Card", %{conn: conn, user: user} do
+      {:ok, activity} = CommonAPI.post(user, %{"status" => "http://example.com/ogp"})
+
+      response =
+        conn
+        |> get("/api/v1/statuses/#{activity.id}/card")
+        |> json_response(200)
+
+      assert response == %{
+               "image" => "http://ia.media-imdb.com/images/rock.jpg",
+               "title" => "The Rock",
+               "type" => "link",
+               "url" => "http://www.imdb.com/title/tt0117500/"
+             }
+    end
   end
 end