+ media_type =
+ cond do
+ is_map(url) && is_binary(url["mediaType"]) -> url["mediaType"]
+ is_binary(data["mediaType"]) -> data["mediaType"]
+ is_binary(data["mimeType"]) -> data["mimeType"]
+ true -> nil
+ end
+
+ href =
+ cond do
+ is_map(url) && is_binary(url["href"]) -> url["href"]
+ is_binary(data["url"]) -> data["url"]
+ is_binary(data["href"]) -> data["href"]
+ end
+
+ attachment_url =
+ %{"href" => href}
+ |> add_if_present("mediaType", media_type)
+ |> add_if_present("type", Map.get(url || %{}, "type"))
+
+ %{"url" => [attachment_url]}
+ |> add_if_present("mediaType", media_type)
+ |> add_if_present("type", data["type"])
+ |> add_if_present("name", data["name"])