Revert subscription refactoring.

As discussed in pleroma-meta#2

This reverts commit eb9aa7aa10, reversing
changes made to c4fbb56984.

lib/pleroma/web/pleroma_api/controllers/subscription_notification_controller.ex

@@ -1,71 +0,0 @@
-# Pleroma: A lightweight social networking server
-# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
-# SPDX-License-Identifier: AGPL-3.0-only
-
-defmodule Pleroma.Web.PleromaAPI.SubscriptionNotificationController do
-  use Pleroma.Web, :controller
-
-  import Pleroma.Web.ControllerHelper, only: [add_link_headers: 2]
-
-  alias Pleroma.Activity
-  alias Pleroma.SubscriptionNotification
-  alias Pleroma.User
-  alias Pleroma.Web.PleromaAPI.PleromaAPI
-
-  def index(%{assigns: %{user: user}} = conn, params) do
-    notifications =
-      user
-      |> PleromaAPI.get_subscription_notifications(params)
-      |> Enum.map(&build_notification_data/1)
-
-    conn
-    |> add_link_headers(notifications)
-    |> render("index.json", %{notifications: notifications, for: user})
-  end
-
-  def show(%{assigns: %{user: user}} = conn, %{"id" => id} = _params) do
-    with {:ok, notification} <- SubscriptionNotification.get(user, id) do
-      render(conn, "show.json", %{
-        subscription_notification: build_notification_data(notification),
-        for: user
-      })
-    else
-      {:error, reason} ->
-        conn
-        |> put_status(:forbidden)
-        |> json(%{"error" => reason})
-    end
-  end
-
-  def clear(%{assigns: %{user: user}} = conn, _params) do
-    SubscriptionNotification.clear(user)
-    json(conn, %{})
-  end
-
-  def dismiss(%{assigns: %{user: user}} = conn, %{"id" => id} = _params) do
-    with {:ok, _notif} <- SubscriptionNotification.dismiss(user, id) do
-      json(conn, %{})
-    else
-      {:error, reason} ->
-        conn
-        |> put_status(:forbidden)
-        |> json(%{"error" => reason})
-    end
-  end
-
-  def destroy_multiple(
-        %{assigns: %{user: user}} = conn,
-        %{"ids" => ids} = _params
-      ) do
-    SubscriptionNotification.destroy_multiple(user, ids)
-    json(conn, %{})
-  end
-
-  defp build_notification_data(%{activity: %{data: data}} = notification) do
-    %{
-      notification: notification,
-      actor: User.get_cached_by_ap_id(data["actor"]),
-      parent_activity: Activity.get_create_by_object_ap_id(data["object"])
-    }
-  end
-end