Extract RSS Feed functionality from OStatus

lib/pleroma/web/feed/feed_controller.ex

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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.Feed.FeedController do
+  use Pleroma.Web, :controller
+
+  alias Fallback.RedirectController
+  alias Pleroma.User
+  alias Pleroma.Web.ActivityPub.ActivityPub
+  alias Pleroma.Web.ActivityPub.ActivityPubController
+
+  plug(Pleroma.Plugs.SetFormatPlug when action in [:feed_redirect])
+
+  action_fallback(:errors)
+
+  def feed_redirect(%{assigns: %{format: "html"}} = conn, %{"nickname" => nickname}) do
+    with {_, %User{} = user} <- {:fetch_user, User.get_cached_by_nickname_or_id(nickname)} do
+      RedirectController.redirector_with_meta(conn, %{user: user})
+    end
+  end
+
+  def feed_redirect(%{assigns: %{format: format}} = conn, _params)
+      when format in ["json", "activity+json"] do
+    ActivityPubController.call(conn, :user)
+  end
+
+  def feed_redirect(conn, %{"nickname" => nickname}) do
+    with {_, %User{} = user} <- {:fetch_user, User.get_cached_by_nickname(nickname)} do
+      redirect(conn, external: "#{feed_url(conn, :feed, user.nickname)}.atom")
+    end
+  end
+
+  def feed(conn, %{"nickname" => nickname} = params) do
+    with {_, %User{} = user} <- {:fetch_user, User.get_cached_by_nickname(nickname)} do
+      query_params =
+        params
+        |> Map.take(["max_id"])
+        |> Map.put("type", ["Create"])
+        |> Map.put("whole_db", true)
+        |> Map.put("actor_id", user.ap_id)
+
+      activities =
+        query_params
+        |> ActivityPub.fetch_public_activities()
+        |> Enum.reverse()
+
+      conn
+      |> put_resp_content_type("application/atom+xml")
+      |> render("feed.xml", user: user, activities: activities)
+    end
+  end
+
+  def errors(conn, {:error, :not_found}) do
+    render_error(conn, :not_found, "Not found")
+  end
+
+  def errors(conn, {:fetch_user, nil}), do: errors(conn, {:error, :not_found})
+
+  def errors(conn, _) do
+    render_error(conn, :internal_server_error, "Something went wrong")
+  end
+end

lib/pleroma/web/feed/feed_view.ex

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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.Feed.FeedView do
+  use Phoenix.HTML
+  use Pleroma.Web, :view
+
+  alias Pleroma.Object
+  alias Pleroma.User
+  alias Pleroma.Web.MediaProxy
+
+  require Pleroma.Constants
+
+  def most_recent_update(activities, user) do
+    (List.first(activities) || user).updated_at
+    |> NaiveDateTime.to_iso8601()
+  end
+
+  def logo(user) do
+    user
+    |> User.avatar_url()
+    |> MediaProxy.url()
+  end
+
+  def last_activity(activities) do
+    List.last(activities)
+  end
+
+  def activity_object(activity) do
+    Object.normalize(activity)
+  end
+
+  def activity_object_data(activity) do
+    activity
+    |> activity_object()
+    |> Map.get(:data)
+  end
+
+  def activity_content(activity) do
+    content = activity_object_data(activity)["content"]
+
+    content
+    |> String.replace(~r/[\n\r]/, "")
+    |> escape()
+  end
+
+  def activity_context(activity) do
+    activity.data["context"]
+  end
+
+  def attachment_href(attachment) do
+    attachment["url"]
+    |> hd()
+    |> Map.get("href")
+  end
+
+  def attachment_type(attachment) do
+    attachment["url"]
+    |> hd()
+    |> Map.get("mediaType")
+  end
+
+  def get_href(id) do
+    with %Object{data: %{"external_url" => external_url}} <- Object.get_cached_by_ap_id(id) do
+      external_url
+    else
+      _e -> id
+    end
+  end
+
+  def escape(html) do
+    html
+    |> html_escape()
+    |> safe_to_string()
+  end
+end