Claudio Ortolina
42 lines
1.0 KiB
Elixir
42 lines
1.0 KiB
Elixir
defmodule MusicLibraryWeb.ArtistController do
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use MusicLibraryWeb, :controller
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alias MusicLibrary.Artists
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# 1 year in seconds
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@cache_duration 60 * 60 * 24 * 365
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def image(conn, %{"musicbrainz_id" => artist_id}) do
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case Artists.get_image(artist_id) do
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nil ->
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not_found(conn)
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%{image_data: image_data, image_data_hash: etag} ->
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case get_req_header(conn, "if-none-match") do
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[^etag] -> extend_cache(conn)
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_ -> respond_with_cache(conn, image_data, etag)
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end
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end
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end
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defp not_found(conn) do
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conn
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|> put_status(:not_found)
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|> text("Not found")
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end
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defp extend_cache(conn) do
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conn
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|> put_resp_header("cache-control", "public, max-age=#{@cache_duration}")
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|> send_resp(304, "")
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end
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defp respond_with_cache(conn, image_data, etag) do
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conn
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|> put_resp_content_type("image/jpeg", "utf-8")
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|> put_resp_header("cache-control", "public, max-age=#{@cache_duration}")
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|> put_resp_header("etag", etag)
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|> send_resp(200, image_data)
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end
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end
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