Rename /images to /covers

lib/music_library_web/controllers/cover_controller.ex

@@ -0,0 +1,26 @@
+defmodule MusicLibraryWeb.CoverController do
+  use MusicLibraryWeb, :controller
+
+  alias MusicLibrary.Records
+
+  def show(conn, %{"record_id" => record_id}) do
+    case Records.get_cover(record_id) do
+      nil ->
+        conn
+        |> put_status(:not_found)
+        |> text("Not found")
+
+      %{cover_data: cover_data, cover_hash: etag} ->
+        case get_req_header(conn, "if-none-match") do
+          [^etag] ->
+            send_resp(conn, 304, "")
+
+          _ ->
+            conn
+            |> put_resp_content_type("image/jpeg", "utf-8")
+            |> put_resp_header("etag", etag)
+            |> send_resp(200, cover_data)
+        end
+    end
+  end
+end