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Postgres sync engine. Sync little subsets of your Postgres data into local apps and services.

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electric lib electric plug options_shape_plug.ex
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lib/electric/plug/options_shape_plug.ex 

defmodule Electric.Plug.OptionsShapePlug do

  require Logger

  use Plug.Builder



  plug :add_cache_max_age_header

  plug :filter_cors_headers

  plug :add_keep_alive

  plug :send_options_response



  @allowed_headers ["if-none-match"]



  defp add_cache_max_age_header(conn, _) do

    conn

    |> Plug.Conn.put_resp_header("access-control-max-age", "86400")

    |> Plug.Conn.delete_resp_header("cache-control")

  end



  # Filters out the unsupported headers from the provided "access-control-request-headers"

  defp filter_cors_headers(conn, _) do

    case Plug.Conn.get_req_header(conn, "access-control-request-headers") do

      [] ->

        conn



      headers ->

        supported_headers =

          headers

          |> Enum.filter(&Enum.member?(@allowed_headers, String.downcase(&1)))

          |> Enum.join(",")



        case supported_headers do

          "" -> conn

          _ -> Plug.Conn.put_resp_header(conn, "access-control-allow-headers", supported_headers)

        end

    end

  end



  defp add_keep_alive(conn, _), do: Plug.Conn.put_resp_header(conn, "connection", "keep-alive")



  defp send_options_response(conn, _), do: send_resp(conn, 204, "")

end