Graham McIntire
b8a9b8a465
Turned on :error_handling, :underspecs, and :unmatched_returns in mix.exs dialyzer config. The 97 warnings this surfaced were fixed in place rather than suppressed: - unmatched_return (79): explicit discard with `_ = ...` for fire-and-forget side effects (Process.cancel_timer, :ets.new, send/2), and pattern-matched `:ok = ...` for control-plane Phoenix.PubSub subscribe/unsubscribe/broadcast calls so a future return-shape change fails loud. - contract_supertype (18): tightened @spec arg and return types on data_builder, historical_loader, url_params, packet_utils, encoding_utils, aprs_symbol, weather_controller, packet_replay to match each function's actual success typing. No behavioural change. mix compile clean, 1008 tests pass, dialyzer count is now 0.
48 lines
1.2 KiB
Elixir
48 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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conn
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|> get_req_header("accept-language")
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|> extract_locale()
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end
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defp extract_locale([accept_language | _]), do: parse_accept_language(accept_language)
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defp extract_locale(_), do: nil
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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.find(&supported_locale?/1)
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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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