Update

lib/nulla_web/controllers/activitypub/follow_json.ex

@@ -0,0 +1,84 @@
+defmodule NullaWeb.ActivityPub.FollowJSON do
+  def following(actor, total) do
+    Jason.OrderedObject.new(
+      "@context": "https://www.w3.org/ns/activitystreams",
+      id: "#{actor.ap_id}/following",
+      type: "OrderedCollection",
+      totalItems: total,
+      first: "#{actor.ap_id}/following?page=1"
+    )
+  end
+
+  def following(actor, total, following_list, page, limit) when is_integer(page) and page > 0 do
+    data = [
+      "@context": "https://www.w3.org/ns/activitystreams",
+      id: "#{actor.ap_id}/following?page=#{page}",
+      type: "OrderedCollectionPage",
+      totalItems: total,
+      next: "#{actor.ap_id}/following?page=#{page + 1}",
+      prev: "#{actor.ap_id}/following?page=#{page - 1}",
+      partOf: "#{actor.ap_id}/following",
+      orderedItems: following_list
+    ]
+
+    data =
+      if page <= 1 do
+        Keyword.delete(data, :prev)
+      else
+        data
+      end
+
+    data =
+      if page * limit > total do
+        data
+        |> Keyword.delete(:next)
+        |> Keyword.delete(:prev)
+      else
+        data
+      end
+
+    Jason.OrderedObject.new(data)
+  end
+
+  def followers(actor, total) do
+    Jason.OrderedObject.new(
+      "@context": "https://www.w3.org/ns/activitystreams",
+      id: "#{actor.ap_id}/followers",
+      type: "OrderedCollection",
+      totalItems: total,
+      first: "#{actor.ap_id}/followers?page=1"
+    )
+  end
+
+  def followers(actor, total, followers_list, page, limit)
+      when is_integer(page) and page > 0 do
+    data = [
+      "@context": "https://www.w3.org/ns/activitystreams",
+      id: "#{actor.ap_id}/followers?page=#{page}",
+      type: "OrderedCollectionPage",
+      totalItems: total,
+      next: "#{actor.ap_id}/followers?page=#{page + 1}",
+      prev: "#{actor.ap_id}/followers?page=#{page - 1}",
+      partOf: "#{actor.ap_id}/followers",
+      orderedItems: followers_list
+    ]
+
+    data =
+      if page <= 1 do
+        Keyword.delete(data, :prev)
+      else
+        data
+      end
+
+    data =
+      if page * limit > total do
+        data
+        |> Keyword.delete(:next)
+        |> Keyword.delete(:prev)
+      else
+        data
+      end
+
+    Jason.OrderedObject.new(data)
+  end
+end