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lib/nulla_web/controllers/activity_json.ex

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+defmodule NullaWeb.ActivityJSON do
+  alias Nulla.Activities.Activity
+
+  @doc """
+  Renders a list of activities.
+  """
+  def index(%{activities: activities}) do
+    %{data: for(activity <- activities, do: data(activity))}
+  end
+
+  @doc """
+  Renders a single activity.
+  """
+  def show(%{activity: activity}) do
+    %{data: data(activity)}
+  end
+
+  defp data(%Activity{} = activity) do
+    %{
+      id: activity.id,
+      ap_id: activity.ap_id,
+      type: activity.type,
+      actor: activity.actor,
+      object: activity.object,
+      to: activity.to,
+      cc: activity.cc
+    }
+  end
+
+  def activitypub(%Activity{} = activity) do
+    Jason.OrderedObject.new(
+      "@context": "https://www.w3.org/ns/activitystreams",
+      id: activity.ap_id,
+      type: activity.type,
+      actor: activity.actor,
+      object: activity.object,
+      to: activity.to,
+      cc: activity.cc
+    )
+  end
+end