Graham McIntire
b5d7cf4a38
Use CF-IPLatitude/CF-IPLongitude headers instead of making HTTP calls to ip-api.com on every page load. Eliminates ~500ms latency, external API dependency, and flaky tests. Also disable test server to prevent port conflicts during development.
36 lines
1.1 KiB
Elixir
36 lines
1.1 KiB
Elixir
defmodule AprsmeWeb.Plugs.IPGeolocation do
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@moduledoc """
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Plug that extracts geolocation from Cloudflare's CF-IPLatitude and CF-IPLongitude
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headers on initial page load. Results are stored in the session to avoid repeated parsing.
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"""
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@behaviour Plug
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import Plug.Conn
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@impl true
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def init(opts), do: opts
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@impl true
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def call(%{request_path: "/", method: "GET"} = conn, _opts) do
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conn
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|> get_session(:ip_geolocation)
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|> handle_geolocation(conn)
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end
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def call(conn, _opts), do: conn
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defp handle_geolocation(nil, conn), do: extract_cf_headers(conn)
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defp handle_geolocation(_cached, conn), do: conn
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defp extract_cf_headers(conn) do
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with [lat_str] <- get_req_header(conn, "cf-iplatitude"),
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[lng_str] <- get_req_header(conn, "cf-iplongitude"),
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{lat, ""} <- Float.parse(lat_str),
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{lng, ""} <- Float.parse(lng_str),
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true <- lat >= -90 and lat <= 90 and lng >= -180 and lng <= 180 do
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put_session(conn, :ip_geolocation, %{"lat" => lat, "lng" => lng})
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else
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_ -> conn
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end
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end
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end
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