forked from potsda.mn/mobilizon
75 lines
2.2 KiB
Elixir
75 lines
2.2 KiB
Elixir
# Portions of this file are derived from Pleroma:
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# Pleroma: A lightweight social networking server
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# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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# NOTE: this module is based on https://github.com/smeevil/set_locale
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defmodule Mobilizon.Web.Plugs.DetectLocalePlug do
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@moduledoc """
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Plug to set locale for Gettext
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"""
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import Plug.Conn, only: [get_req_header: 2, assign: 3]
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alias Mobilizon.Web.Gettext, as: GettextBackend
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@spec init(any()) :: any()
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def init(_), do: nil
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@spec call(Plug.Conn.t(), Keyword.t()) :: Plug.Conn.t()
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def call(conn, _) do
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locale = get_locale_from_header(conn)
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assign(conn, :detected_locale, locale)
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end
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@spec get_locale_from_header(Plug.Conn.t()) :: String.t()
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defp get_locale_from_header(conn) do
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conn
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|> extract_accept_language()
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|> Enum.find(&supported_locale?/1)
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end
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@spec extract_accept_language(Plug.Conn.t()) :: list(String.t())
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defp extract_accept_language(conn) do
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case get_req_header(conn, "accept-language") do
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[value | _] ->
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value
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|> String.split(",")
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|> Enum.map(&parse_language_option/1)
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|> Enum.sort(&(&1.quality > &2.quality))
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|> Enum.map(& &1.tag)
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|> Enum.reject(&is_nil/1)
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|> ensure_language_fallbacks()
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_ ->
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[]
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end
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end
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@spec supported_locale?(String.t()) :: boolean()
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defp supported_locale?(locale) do
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GettextBackend
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|> Gettext.known_locales()
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|> Enum.member?(locale)
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end
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@spec parse_language_option(String.t()) :: %{tag: String.t(), quality: float()}
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defp parse_language_option(string) do
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captures = Regex.named_captures(~r/^\s?(?<tag>[\w\-]+)(?:;q=(?<quality>[\d\.]+))?$/i, string)
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quality =
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case Float.parse(captures["quality"] || "1.0") do
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{val, _} -> val
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:error -> 1.0
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end
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%{tag: captures["tag"], quality: quality}
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end
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@spec ensure_language_fallbacks(list(String.t())) :: list(String.t())
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defp ensure_language_fallbacks(tags) do
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Enum.flat_map(tags, fn tag ->
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[language | _] = String.split(tag, "-")
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if Enum.member?(tags, language), do: [tag], else: [tag, language]
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end)
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end
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end
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