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diff --git a/lib/pleroma/web/gettext.ex b/lib/pleroma/web/gettext.ex
index 828b98b15..cfd92f991 100644
--- a/lib/pleroma/web/gettext.ex
+++ b/lib/pleroma/web/gettext.ex
@@ -1,67 +1,81 @@
# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.Gettext do
@moduledoc """
A module providing Internationalization with a gettext-based API.
By using [Gettext](https://hexdocs.pm/gettext),
your module gains a set of macros for translations, for example:
import Pleroma.Web.Gettext
# Simple translation
gettext "Here is the string to translate"
# Plural translation
ngettext "Here is the string to translate",
"Here are the strings to translate",
3
# Domain-based translation
dgettext "errors", "Here is the error message to translate"
See the [Gettext Docs](https://hexdocs.pm/gettext) for detailed usage.
"""
use Gettext, otp_app: :pleroma
def language_tag do
# Naive implementation: HTML lang attribute uses BCP 47, which
# uses - as a separator.
# https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/lang
Gettext.get_locale()
|> String.replace("_", "-", global: true)
end
def normalize_locale(locale) do
if is_binary(locale) do
String.replace(locale, "-", "_")
else
nil
end
end
def supports_locale?(locale) do
Pleroma.Web.Gettext
|> Gettext.known_locales()
|> Enum.member?(locale)
end
+ def variant?(locale), do: String.contains?(locale, "_")
+
+ def supported_variants_of_locale(locale) do
+ cond do
+ variant?(locale) ->
+ [locale]
+ supports_locale?(locale) ->
+ [locale]
+ true ->
+ Gettext.known_locales(Pleroma.Web.Gettext)
+ |> Enum.filter(fn l -> String.starts_with?(l, locale <> "_") end)
+ end
+ end
+
def locale_or_default(locale) do
if supports_locale?(locale) do
locale
else
Gettext.get_locale()
end
end
defmacro with_locale_or_default(locale, do: fun) do
quote do
Gettext.with_locale(Pleroma.Web.Gettext.locale_or_default(unquote(locale)), fn ->
unquote(fun)
end)
end
end
end
diff --git a/lib/pleroma/web/plugs/set_locale_plug.ex b/lib/pleroma/web/plugs/set_locale_plug.ex
index 4c6e44fb5..78ae566c7 100644
--- a/lib/pleroma/web/plugs/set_locale_plug.ex
+++ b/lib/pleroma/web/plugs/set_locale_plug.ex
@@ -1,88 +1,94 @@
# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 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 frontend_language_cookie_name, do: "userLanguage"
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_preferred_language()
|> normalize_language_codes()
+ |> first_supported()
+ end
+
+ defp first_supported(locales) do
+ locales
+ |> Enum.flat_map(&Pleroma.Web.Gettext.supported_variants_of_locale/1)
|> Enum.find(&supported_locale?/1)
end
defp normalize_language_codes(codes) do
codes
|> Enum.map(fn code -> Pleroma.Web.Gettext.normalize_locale(code) end)
end
defp extract_preferred_language(conn) do
extract_frontend_language(conn) ++ extract_accept_language(conn)
end
defp extract_frontend_language(conn) do
%{req_cookies: cookies} =
conn
|> Plug.Conn.fetch_cookies()
case cookies[frontend_language_cookie_name()] do
nil ->
[]
fe_lang ->
[fe_lang]
|> ensure_language_fallbacks()
end
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.supports_locale?(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
diff --git a/test/pleroma/web/plugs/set_locale_plug_test.exs b/test/pleroma/web/plugs/set_locale_plug_test.exs
index 043d7eb18..349326c24 100644
--- a/test/pleroma/web/plugs/set_locale_plug_test.exs
+++ b/test/pleroma/web/plugs/set_locale_plug_test.exs
@@ -1,105 +1,119 @@
# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.Plugs.SetLocalePlugTest do
use ExUnit.Case, async: true
use Plug.Test
alias Pleroma.Web.Plugs.SetLocalePlug
alias Plug.Conn
test "default locale is `en`" do
conn =
:get
|> conn("/cofe")
|> SetLocalePlug.call([])
assert "en" == Gettext.get_locale()
assert %{locale: "en"} == conn.assigns
end
test "use supported locale from `accept-language`" do
conn =
:get
|> conn("/cofe")
|> Conn.put_req_header(
"accept-language",
"ru, fr-CH, fr;q=0.9, en;q=0.8, *;q=0.5"
)
|> SetLocalePlug.call([])
assert "ru" == Gettext.get_locale()
assert %{locale: "ru"} == conn.assigns
end
test "use supported locale with specifiers from `accept-language`" do
conn =
:get
|> conn("/cofe")
|> Conn.put_req_header(
"accept-language",
"zh-Hans;q=0.9, en;q=0.8, *;q=0.5"
)
|> SetLocalePlug.call([])
assert "zh_Hans" == Gettext.get_locale()
assert %{locale: "zh_Hans"} == conn.assigns
end
+ test "fallback to some variant of the language if the unqualified language is not supported" do
+ conn =
+ :get
+ |> conn("/cofe")
+ |> Conn.put_req_header(
+ "accept-language",
+ "zh;q=0.9, en;q=0.8, *;q=0.5"
+ )
+ |> SetLocalePlug.call([])
+
+ assert "zh_" <> _ = Gettext.get_locale()
+ assert %{locale: "zh_" <> _} = conn.assigns
+ end
+
test "use supported locale from cookie" do
conn =
:get
|> conn("/cofe")
|> put_req_cookie(SetLocalePlug.frontend_language_cookie_name(), "zh-Hans")
|> Conn.put_req_header(
"accept-language",
"ru, fr-CH, fr;q=0.9, en;q=0.8, *;q=0.5"
)
|> SetLocalePlug.call([])
assert "zh_Hans" == Gettext.get_locale()
assert %{locale: "zh_Hans"} == conn.assigns
end
test "fallback to supported locale from `accept-language` if locale in cookie not supported" do
conn =
:get
|> conn("/cofe")
|> put_req_cookie(SetLocalePlug.frontend_language_cookie_name(), "x-nonexist")
|> Conn.put_req_header(
"accept-language",
"ru, fr-CH, fr;q=0.9, en;q=0.8, *;q=0.5"
)
|> SetLocalePlug.call([])
assert "ru" == Gettext.get_locale()
assert %{locale: "ru"} == conn.assigns
end
test "fallback to default if nothing is supported" do
conn =
:get
|> conn("/cofe")
|> put_req_cookie(SetLocalePlug.frontend_language_cookie_name(), "x-nonexist")
|> Conn.put_req_header(
"accept-language",
"x-nonexist"
)
|> SetLocalePlug.call([])
assert "en" == Gettext.get_locale()
assert %{locale: "en"} == conn.assigns
end
test "use default locale if locale from `accept-language` is not supported" do
conn =
:get
|> conn("/cofe")
|> Conn.put_req_header("accept-language", "tlh")
|> SetLocalePlug.call([])
assert "en" == Gettext.get_locale()
assert %{locale: "en"} == conn.assigns
end
end

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