Support arbitrary resizing in cover controller

test/music_library_web/controllers/cover_controller_test.exs

@@ -2,6 +2,7 @@ defmodule MusicLibraryWeb.CoverControllerTest do
   use MusicLibraryWeb.ConnCase
 
   import MusicLibrary.RecordsFixtures
+  alias MusicLibrary.Records.Cover
 
   defp create_record(_) do
     %{record: record_fixture()}
@@ -55,5 +56,19 @@ defmodule MusicLibraryWeb.CoverControllerTest do
 
       assert conn.resp_body == <<>>
     end
+
+    test "accepts a size attribute for resizing", %{conn: conn, record: record} do
+      conn = get(conn, ~p"/covers/#{record.id}?size=480")
+
+      thumb = File.read!(marbles_thumb_fixture())
+      hash = Cover.hash(thumb)
+
+      assert conn.status == 200
+      assert get_resp_header(conn, "content-type") == ["image/jpeg; charset=utf-8"]
+      assert get_resp_header(conn, "cache-control") == ["public, max-age=86400"]
+      assert get_resp_header(conn, "etag") == [hash]
+
+      assert conn.resp_body == thumb
+    end
   end
 end