68 lines
1.6 KiB
Elixir
68 lines
1.6 KiB
Elixir
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defmodule ExmrWeb.Plugs.Locale do
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import Plug.Conn
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def init(_opts), do: nil
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def call(conn, _opts) do
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accepted_languages = extract_accept_language(conn)
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known_locales = Gettext.known_locales(ExmrWeb.Gettext)
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accepted_languages =
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known_locales --
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known_locales -- accepted_languages
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case accepted_languages do
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[locale | _] ->
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Gettext.put_locale(ExmrWeb.Gettext, locale)
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conn
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|> put_session(:locale, locale)
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_ ->
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conn
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end
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end
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# Copied from
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# https://raw.githubusercontent.com/smeevil/set_locale/fd35624e25d79d61e70742e42ade955e5ff857b8/lib/headers.ex
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def extract_accept_language(conn) do
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case Plug.Conn.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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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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_ -> 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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defp ensure_language_fallbacks(tags) do
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Enum.flat_map(tags, fn tag ->
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case String.split(tag, "-") do
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[language, _country_variant] ->
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if Enum.member?(tags, language), do: [tag], else: [tag, language]
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[_language] ->
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[tag]
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end
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end)
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end
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end
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