instance_static.ex
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instance_static.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.Plugs.InstanceStatic do
	@moduledoc """
	This is a shim to call `Plug.Static` but with runtime `from` configuration.

	Mountpoints are defined directly in the module to avoid calling the configuration for every request including non-static ones.
	"""
	@behaviour Plug

	def file_path(path) do
	instance_path =
	Path.join(Pleroma.Config.get([:instance, :static_dir], "instance/static/"), path)

	if File.exists?(instance_path) do
	instance_path
	else
	Path.join(Application.app_dir(:pleroma, "priv/static/"), path)
	end
	end

	@only ~w(index.html robots.txt static emoji packs sounds images instance favicon.png sw.js
	sw-pleroma.js)

	def init(opts) do
	opts
	\|> Keyword.put(:from, "__unconfigured_instance_static_plug")
	\|> Keyword.put(:at, "/__unconfigured_instance_static_plug")
	\|> Plug.Static.init()
	end

	for only <- @only do
	at = Plug.Router.Utils.split("/")

	def call(%{request_path: "/" <> unquote(only) <> _} = conn, opts) do
	call_static(
	conn,
	opts,
	unquote(at),
	Pleroma.Config.get([:instance, :static_dir], "instance/static")
	)
	end
	end

	def call(conn, _) do
	conn
	end

	defp call_static(conn, opts, at, from) do
	opts =
	opts
	\|> Map.put(:from, from)
	\|> Map.put(:at, at)

	Plug.Static.call(conn, opts)
	end
	end