Claudio Ortolina
62 lines
1.8 KiB
Elixir
62 lines
1.8 KiB
Elixir
defmodule MusicLibraryWeb.CoverController do
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use MusicLibraryWeb, :controller
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alias MusicLibrary.Records
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alias MusicLibrary.Records.Cover
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def show(conn, %{"record_id" => record_id, "size" => size}) do
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case Records.get_cover(record_id) do
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nil ->
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conn
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|> put_status(:not_found)
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|> text("Not found")
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%{cover_data: cover_data} ->
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{:ok, thumb_data} = Cover.resize(cover_data, String.to_integer(size))
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hash = :crypto.hash(:sha256, thumb_data) |> Base.encode16()
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case get_req_header(conn, "if-none-match") do
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[^hash] ->
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conn
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# 24 hours
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|> put_resp_header("cache-control", "public, max-age=86400")
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|> send_resp(304, "")
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_ ->
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conn
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|> put_resp_content_type("image/jpeg", "utf-8")
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# 24 hours
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|> put_resp_header("cache-control", "public, max-age=86400")
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|> put_resp_header("etag", hash)
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|> send_resp(200, thumb_data)
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end
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end
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end
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def show(conn, %{"record_id" => record_id}) do
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case Records.get_cover(record_id) do
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nil ->
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conn
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|> put_status(:not_found)
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|> text("Not found")
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%{cover_data: cover_data, cover_hash: etag} ->
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case get_req_header(conn, "if-none-match") do
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[^etag] ->
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conn
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# 24 hours
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|> put_resp_header("cache-control", "public, max-age=86400")
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|> send_resp(304, "")
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_ ->
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conn
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|> put_resp_content_type("image/jpeg", "utf-8")
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# 24 hours
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|> put_resp_header("cache-control", "public, max-age=86400")
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|> put_resp_header("etag", etag)
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|> send_resp(200, cover_data)
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end
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end
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end
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end
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