set_locale_plug.ex
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set_locale_plug.ex
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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	# NOTE: this module is based on https://github.com/smeevil/set_locale
	defmodule Pleroma.Web.Plugs.SetLocalePlug do
	import Plug.Conn, only: [get_req_header: 2, assign: 3]

	def init(_), do: nil

	def call(conn, _) do
	locale = get_locale_from_header(conn) \|\| Gettext.get_locale()
	Gettext.put_locale(locale)
	assign(conn, :locale, locale)
	end

	defp get_locale_from_header(conn) do
	conn
	\|> extract_accept_language()
	\|> Enum.find(&supported_locale?/1)
	end

	defp extract_accept_language(conn) do
	case get_req_header(conn, "accept-language") do
	[value \| _] ->
	value
	\|> String.split(",")
	\|> Enum.map(&parse_language_option/1)
	\|> Enum.sort(&(&1.quality > &2.quality))
	\|> Enum.map(& &1.tag)
	\|> Enum.reject(&is_nil/1)
	\|> ensure_language_fallbacks()

	_ ->
	[]
	end
	end

	defp supported_locale?(locale) do
	Pleroma.Web.Gettext
	\|> Gettext.known_locales()
	\|> Enum.member?(locale)
	end

	defp parse_language_option(string) do
	captures = Regex.named_captures(~r/^\s?(?<tag>[\w\-]+)(?:;q=(?<quality>[\d\.]+))?$/i, string)

	quality =
	case Float.parse(captures["quality"] \|\| "1.0") do
	{val, _} -> val
	:error -> 1.0
	end

	%{tag: captures["tag"], quality: quality}
	end

	defp ensure_language_fallbacks(tags) do
	Enum.flat_map(tags, fn tag ->
	[language \| _] = String.split(tag, "-")
	if Enum.member?(tags, language), do: [tag], else: [tag, language]
	end)
	end
	end