tag_controller.ex
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tag_controller.ex
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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	defmodule Pleroma.Web.Feed.TagController do
	use Pleroma.Web, :controller

	alias Pleroma.Config
	alias Pleroma.Web.ActivityPub.ActivityPub
	alias Pleroma.Web.Feed.FeedView

	def feed(conn, params) do
	if not Config.restrict_unauthenticated_access?(:timelines, :local) do
	render_feed(conn, params)
	else
	render_error(conn, :not_found, "Not found")
	end
	end

	defp render_feed(conn, %{"tag" => raw_tag} = params) do
	local_only = Config.restrict_unauthenticated_access?(:timelines, :federated)

	{format, tag} = parse_tag(raw_tag)

	activities =
	%{type: ["Create"], tag: tag, local_only: local_only}
	\|> Pleroma.Maps.put_if_present(:max_id, params["max_id"])
	\|> ActivityPub.fetch_public_activities()

	conn
	\|> put_resp_content_type("application/#{format}+xml")
	\|> put_view(FeedView)
	\|> render("tag.#{format}",
	activities: activities,
	tag: tag,
	feed_config: Config.get([:feed])
	)
	end

	@spec parse_tag(binary() \| any()) :: {format :: String.t(), tag :: String.t()}
	defp parse_tag(raw_tag) do
	case is_binary(raw_tag) && Enum.reverse(String.split(raw_tag, ".")) do
	[format \| tag] when format in ["rss", "atom"] ->
	{format, Enum.join(tag, ".")}

	_ ->
	{"atom", raw_tag}
	end
	end
	end