Graham McIntire
4366fa36da
Replace case/cond/if blocks with multi-clause function dispatch
and pattern matching in function heads across 9 modules:
- WeatherUnits: case to multi-clause unit_system/1, unit_labels via do_unit_labels/1
- PacketUtils: if to pattern match on %{"id" => id}, multi-clause threshold/callsign
- SetLocale: case to multi-clause extract_locale/1
- IPGeolocation: if/cond to pattern match on conn, binary prefix matching for private_ip?
- DeviceIdentification: cond to extracted pattern_matches?/2
- MobileChannel: cond to multi-clause do_callsign_match/2
- PacketProcessor: cond to dispatch_visibility/6 on {in_bounds, has_marker} tuple
- PacketManager: destructure packet_state in heads, multi-clause maybe_cleanup/3
- AprsSymbol: case/if to multi-clause get_table_id/1, normalize_symbol_code/1
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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