Expose posts media through AP

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/web/views/page_view.ex

@@ -8,6 +8,7 @@ defmodule Mobilizon.Web.PageView do
   alias Mobilizon.Actors.Actor
   alias Mobilizon.Discussions.{Comment, Discussion}
   alias Mobilizon.Events.Event
+  alias Mobilizon.Posts.Post
   alias Mobilizon.Resources.Resource
   alias Mobilizon.Tombstone
 
@@ -54,6 +55,12 @@ defmodule Mobilizon.Web.PageView do
     |> Map.merge(Utils.make_json_ld_header())
   end
 
+  def render("post.activity-json", %{conn: %{assigns: %{object: %Post{} = post}}}) do
+    post
+    |> Convertible.model_to_as()
+    |> Map.merge(Utils.make_json_ld_header())
+  end
+
   def render(page, %{object: object, conn: conn} = _assigns)
       when page in ["actor.html", "event.html", "comment.html", "post.html"] do
     locale = get_locale(conn)