Add AP following endpoint

lib/clacks/actor.ex

@@ -74,4 +74,9 @@ defmodule Clacks.Actor do
         end
     end
   end
+
+  @spec get_all_following(actor :: t()) :: [t()]
+  def get_all_following(actor) do
+    Repo.all(from a in __MODULE__, where: ^actor.ap_id in a.followers)
+  end
 end

lib/clacks_web/controllers/actor_controller.ex

@@ -1,7 +1,6 @@
 defmodule ClacksWeb.ActorController do
   use ClacksWeb, :controller
   alias Clacks.Actor
-  import Ecto.Query
 
   @context "https://www.w3.org/ns/activitystreams"
 
@@ -64,6 +63,42 @@ defmodule ClacksWeb.ActorController do
     |> json(data)
   end
 
+  def following(conn, %{"page" => page}) do
+    actor = conn.assigns[:actor]
+
+    following =
+      Actor.get_all_following(actor)
+      |> Enum.map(fn actor -> actor.ap_id end)
+
+    data =
+      collection_page(conn, following, page)
+      |> Map.put("@context", @context)
+
+    conn
+    |> put_resp_header("content-type", "application/activity+json")
+    |> json(data)
+  end
+
+  def following(conn, _params) do
+    actor = conn.assigns[:actor]
+
+    following =
+      Actor.get_all_following(actor)
+      |> Enum.map(fn actor -> actor.ap_id end)
+
+    data = %{
+      "@context" => @context,
+      "type" => "OrderedCollection",
+      "id" => current_url(conn, %{}),
+      "totalItems" => length(following),
+      "first" => collection_page(conn, following, 1)
+    }
+
+    conn
+    |> put_resp_header("content-type", "application/activity+json")
+    |> json(data)
+  end
+
   defp collection_page(conn, collection, page) do
     chunks = Enum.chunk_every(collection, 20)
     # page is 1 indexed, so subtract 1 to get the current chunk

lib/clacks_web/router.ex

@@ -24,6 +24,7 @@ defmodule ClacksWeb.Router do
 
     get "/users/:nickname", ActorController, :get
     get "/users/:nickname/followers", ActorController, :followers
+    get "/users/:nickname/following", ActorController, :following
 
     post "/inbox", InboxController, :shared
     post "/users/:nickname/inbox", InboxController, :user_specific