Add following and followers

lib/nulla_web/controllers/follow_controller.ex

@@ -0,0 +1,65 @@
+defmodule NullaWeb.FollowController do
+  use NullaWeb, :controller
+  alias Nulla.Models.User
+  alias Nulla.Models.InstanceSettings
+  alias Nulla.ActivityPub
+  alias Nulla.Utils
+
+  def following(conn, %{"username" => username, "page" => page_param}) do
+    instance_settings = InstanceSettings.get_instance_settings!()
+    domain = instance_settings.domain
+    offset = instance_settings.offset
+    user = User.get_user_by_username!(username)
+    total = Utils.count_following_by_username!(user.username)
+    page =
+    case Integer.parse(page_param) do
+      {int, _} when int > 0 -> int
+      _ -> 1
+    end
+    following_list = Utils.get_following_users_by_username!(user.username, page)
+
+    conn
+      |> put_resp_content_type("application/activity+json")
+      |> json(ActivityPub.following(domain, user, total, following_list, page, offset))
+  end
+
+  def following(conn, %{"username" => username}) do
+    instance_settings = InstanceSettings.get_instance_settings!()
+    domain = instance_settings.domain
+    user = User.get_user_by_username!(username)
+    total = Utils.count_following_by_username!(user.username)
+
+    conn
+      |> put_resp_content_type("application/activity+json")
+      |> json(ActivityPub.following(domain, user, total))
+  end
+
+  def followers(conn, %{"username" => username, "page" => page_param}) do
+    instance_settings = InstanceSettings.get_instance_settings!()
+    domain = instance_settings.domain
+    offset = instance_settings.offset
+    user = User.get_user_by_username!(username)
+    total = Utils.count_followers_by_username!(user.username)
+    page =
+    case Integer.parse(page_param) do
+      {int, _} when int > 0 -> int
+      _ -> 1
+    end
+    followers_list = Utils.get_followers_by_username!(user.username, page)
+
+    conn
+      |> put_resp_content_type("application/activity+json")
+      |> json(ActivityPub.followers(domain, user, total, followers_list, page, offset))
+  end
+
+  def followers(conn, %{"username" => username}) do
+    instance_settings = InstanceSettings.get_instance_settings!()
+    domain = instance_settings.domain
+    user = User.get_user_by_username!(username)
+    total = Utils.count_followers_by_username!(user.username)
+
+    conn
+      |> put_resp_content_type("application/activity+json")
+      |> json(ActivityPub.followers(domain, user, total))
+  end
+end