50 lines
1.2 KiB
Elixir
50 lines
1.2 KiB
Elixir
defmodule AprsmeWeb.Plugs.SetLocale do
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@moduledoc """
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A plug that sets the locale based on the Accept-Language header.
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Falls back to English if the requested locale is not available.
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"""
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import Plug.Conn
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def init(opts), do: opts
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def call(conn, _opts) do
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locale = get_locale_from_header(conn) || "en"
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# Set the backend's locale for the current process
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Gettext.put_locale(AprsmeWeb.Gettext, locale)
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# Store locale in session for LiveView to access
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conn = put_session(conn, :locale, locale)
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conn
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end
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defp get_locale_from_header(conn) do
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case get_req_header(conn, "accept-language") do
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[accept_language | _] ->
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parse_accept_language(accept_language)
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_ ->
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nil
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end
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end
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defp parse_accept_language(accept_language) do
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accept_language
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|> String.split(",")
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|> Enum.map(&parse_language_tag/1)
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|> Enum.filter(&supported_locale?/1)
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|> List.first()
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end
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defp parse_language_tag(tag) do
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tag
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|> String.trim()
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|> String.split(";")
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|> List.first()
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|> String.split("-")
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|> List.first()
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|> String.downcase()
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end
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defp supported_locale?(locale) do
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locale in ~w(en es fr de)
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end
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end
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