pleroma/lib/pleroma/web/ostatus/user_representer.ex

defmodule Pleroma.Web.OStatus.UserRepresenter do
  alias Pleroma.User
  def to_simple_form(user) do
    ap_id = to_charlist(user.ap_id)
    nickname = to_charlist(user.nickname)
    name = to_charlist(user.name)
    bio = to_charlist(user.bio)
    avatar_url = to_charlist(User.avatar_url(user))
    banner = if banner_url = User.banner_url(user) do
      [{:link, [rel: 'header', href: banner_url], []}]
    else
      []
    end

    [
      {:id, [ap_id]},
      {:"activity:object", ['http://activitystrea.ms/schema/1.0/person']},
      {:uri, [ap_id]},
      {:"poco:preferredUsername", [nickname]},
      {:"poco:displayName", [name]},
      {:"poco:note", [bio]},
      {:name, [nickname]},
      {:link, [rel: 'avatar', href: avatar_url], []}
    ] ++ banner
  end
end