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plug_image_processing

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Plug to process images on-the-fly using libvips

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plug_image_processing lib plug_image_processing middlewares cache_headers.ex
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lib/plug_image_processing/middlewares/cache_headers.ex 

defmodule PlugImageProcessing.Middlewares.CacheHeaders do

  @moduledoc false

  defstruct config: nil



  defimpl PlugImageProcessing.Middleware do

    import Plug.Conn



    def enabled?(middleware, _conn) do

      is_integer(middleware.config.http_cache_ttl)

    end



    def run(middleware, conn) do

      ttl = middleware.config.http_cache_ttl



      put_resp_header(conn, "cache-control", cache_control(ttl))

    end



    def cache_control(0), do: "private, no-cache, no-store, must-revalidate"



    def cache_control(ttl) do

      "public, s-maxage=#{ttl}, max-age=#{ttl}, no-transform"

    end

  end

end