+ defp handle_preview("image/gif" = _content_type, conn, url) do
+ mediaproxy_url = url |> MediaProxy.url()
+
+ redirect(conn, external: mediaproxy_url)
+ end
+
+ defp handle_preview("image/" <> _ = _content_type, conn, url) do
+ handle_image_preview(conn, url)
+ end
+
+ defp handle_preview("video/" <> _ = _content_type, conn, url) do
+ mediaproxy_url = url |> MediaProxy.url()
+
+ redirect(conn, external: mediaproxy_url)
+ end
+
+ defp handle_preview(content_type, conn, _url) do
+ send_resp(conn, :unprocessable_entity, "Unsupported content type: #{content_type}.")
+ end
+
+ defp handle_image_preview(%{params: params} = conn, url) do
+ quality = Config.get!([:media_preview_proxy, :image_quality])
+
+ with {thumbnail_max_width, thumbnail_max_height} <- thumbnail_max_dimensions(params),
+ {:ok, thumbnail_binary} <-
+ MediaHelper.image_resize(
+ url,
+ %{max_width: thumbnail_max_width, max_height: thumbnail_max_height, quality: quality}
+ ) do
+ conn
+ |> put_resp_header("content-type", "image/jpeg")
+ |> put_resp_header("content-disposition", "inline; filename=\"preview.jpg\"")
+ |> send_resp(200, thumbnail_binary)
+ else
+ _ ->
+ send_resp(conn, :failed_dependency, "Can't handle preview.")
+ end
+ end
+
+ defp thumbnail_max_dimensions(params) do
+ config = Config.get([:media_preview_proxy], [])
+
+ thumbnail_max_width =
+ if w = params["thumbnail_max_width"] do
+ String.to_integer(w)
+ else
+ Keyword.fetch!(config, :thumbnail_max_width)
+ end
+
+ thumbnail_max_height =
+ if h = params["thumbnail_max_height"] do
+ String.to_integer(h)
+ else
+ Keyword.fetch!(config, :thumbnail_max_height)
+ end
+
+ {thumbnail_max_width, thumbnail_max_height}
+ end
+
+ defp preview_head_request_timeout do
+ Keyword.get(media_preview_proxy_opts(), :head_request_max_read_duration) ||
+ Keyword.get(media_proxy_opts(), :max_read_duration) ||
+ ReverseProxy.max_read_duration_default()
+ end
+
+ defp media_proxy_opts do
+ Config.get([:media_proxy, :proxy_opts], [])
+ end