diff options
Diffstat (limited to 'lib/pleroma/web/media_proxy/media_proxy_controller.ex')
| -rw-r--r-- | lib/pleroma/web/media_proxy/media_proxy_controller.ex | 195 |
1 files changed, 176 insertions, 19 deletions
diff --git a/lib/pleroma/web/media_proxy/media_proxy_controller.ex b/lib/pleroma/web/media_proxy/media_proxy_controller.ex index 9a64b0ef3..90651ed9b 100644 --- a/lib/pleroma/web/media_proxy/media_proxy_controller.ex +++ b/lib/pleroma/web/media_proxy/media_proxy_controller.ex @@ -5,44 +5,201 @@ defmodule Pleroma.Web.MediaProxy.MediaProxyController do use Pleroma.Web, :controller + alias Pleroma.Config + alias Pleroma.Helpers.MediaHelper + alias Pleroma.Helpers.UriHelper alias Pleroma.ReverseProxy alias Pleroma.Web.MediaProxy + alias Plug.Conn - @default_proxy_opts [max_body_length: 25 * 1_048_576, http: [follow_redirect: true]] - - def remote(conn, %{"sig" => sig64, "url" => url64} = params) do - with config <- Pleroma.Config.get([:media_proxy], []), - true <- Keyword.get(config, :enabled, false), + def remote(conn, %{"sig" => sig64, "url" => url64}) do + with {_, true} <- {:enabled, MediaProxy.enabled?()}, {:ok, url} <- MediaProxy.decode_url(sig64, url64), {_, false} <- {:in_banned_urls, MediaProxy.in_banned_urls(url)}, - :ok <- filename_matches(params, conn.request_path, url) do - ReverseProxy.call(conn, url, Keyword.get(config, :proxy_opts, @default_proxy_opts)) + :ok <- MediaProxy.verify_request_path_and_url(conn, url) do + ReverseProxy.call(conn, url, media_proxy_opts()) else - error when error in [false, {:in_banned_urls, true}] -> - send_resp(conn, 404, Plug.Conn.Status.reason_phrase(404)) + {:enabled, false} -> + send_resp(conn, 404, Conn.Status.reason_phrase(404)) + + {:in_banned_urls, true} -> + send_resp(conn, 404, Conn.Status.reason_phrase(404)) {:error, :invalid_signature} -> - send_resp(conn, 403, Plug.Conn.Status.reason_phrase(403)) + send_resp(conn, 403, Conn.Status.reason_phrase(403)) {:wrong_filename, filename} -> redirect(conn, external: MediaProxy.build_url(sig64, url64, filename)) end end - def filename_matches(%{"filename" => _} = _, path, url) do - filename = MediaProxy.filename(url) + def preview(%Conn{} = conn, %{"sig" => sig64, "url" => url64}) do + with {_, true} <- {:enabled, MediaProxy.preview_enabled?()}, + {:ok, url} <- MediaProxy.decode_url(sig64, url64), + :ok <- MediaProxy.verify_request_path_and_url(conn, url) do + handle_preview(conn, url) + else + {:enabled, false} -> + send_resp(conn, 404, Conn.Status.reason_phrase(404)) + + {:error, :invalid_signature} -> + send_resp(conn, 403, Conn.Status.reason_phrase(403)) + + {:wrong_filename, filename} -> + redirect(conn, external: MediaProxy.build_preview_url(sig64, url64, filename)) + end + end + + defp handle_preview(conn, url) do + media_proxy_url = MediaProxy.url(url) + + with {:ok, %{status: status} = head_response} when status in 200..299 <- + Pleroma.HTTP.request("head", media_proxy_url, [], [], pool: :media) do + content_type = Tesla.get_header(head_response, "content-type") + content_length = Tesla.get_header(head_response, "content-length") + content_length = content_length && String.to_integer(content_length) + static = conn.params["static"] in ["true", true] + + cond do + static and content_type == "image/gif" -> + handle_jpeg_preview(conn, media_proxy_url) + + static -> + drop_static_param_and_redirect(conn) + + content_type == "image/gif" -> + redirect(conn, external: media_proxy_url) + + min_content_length_for_preview() > 0 and content_length > 0 and + content_length < min_content_length_for_preview() -> + redirect(conn, external: media_proxy_url) + + true -> + handle_preview(content_type, conn, media_proxy_url) + end + else + # If HEAD failed, redirecting to media proxy URI doesn't make much sense; returning an error + {_, %{status: status}} -> + send_resp(conn, :failed_dependency, "Can't fetch HTTP headers (HTTP #{status}).") + + {:error, :recv_response_timeout} -> + send_resp(conn, :failed_dependency, "HEAD request timeout.") + + _ -> + send_resp(conn, :failed_dependency, "Can't fetch HTTP headers.") + end + end + + defp handle_preview("image/png" <> _ = _content_type, conn, media_proxy_url) do + handle_png_preview(conn, media_proxy_url) + end + + defp handle_preview("image/" <> _ = _content_type, conn, media_proxy_url) do + handle_jpeg_preview(conn, media_proxy_url) + end + + defp handle_preview("video/" <> _ = _content_type, conn, media_proxy_url) do + handle_video_preview(conn, media_proxy_url) + end + + defp handle_preview(_unsupported_content_type, conn, media_proxy_url) do + fallback_on_preview_error(conn, media_proxy_url) + end + + defp handle_png_preview(conn, media_proxy_url) do + quality = Config.get!([:media_preview_proxy, :image_quality]) + {thumbnail_max_width, thumbnail_max_height} = thumbnail_max_dimensions() + + with {:ok, thumbnail_binary} <- + MediaHelper.image_resize( + media_proxy_url, + %{ + max_width: thumbnail_max_width, + max_height: thumbnail_max_height, + quality: quality, + format: "png" + } + ) do + conn + |> put_preview_response_headers(["image/png", "preview.png"]) + |> send_resp(200, thumbnail_binary) + else + _ -> + fallback_on_preview_error(conn, media_proxy_url) + end + end + + defp handle_jpeg_preview(conn, media_proxy_url) do + quality = Config.get!([:media_preview_proxy, :image_quality]) + {thumbnail_max_width, thumbnail_max_height} = thumbnail_max_dimensions() - if filename && does_not_match(path, filename) do - {:wrong_filename, filename} + with {:ok, thumbnail_binary} <- + MediaHelper.image_resize( + media_proxy_url, + %{max_width: thumbnail_max_width, max_height: thumbnail_max_height, quality: quality} + ) do + conn + |> put_preview_response_headers() + |> send_resp(200, thumbnail_binary) else - :ok + _ -> + fallback_on_preview_error(conn, media_proxy_url) end end - def filename_matches(_, _, _), do: :ok + defp handle_video_preview(conn, media_proxy_url) do + with {:ok, thumbnail_binary} <- + MediaHelper.video_framegrab(media_proxy_url) do + conn + |> put_preview_response_headers() + |> send_resp(200, thumbnail_binary) + else + _ -> + fallback_on_preview_error(conn, media_proxy_url) + end + end + + defp drop_static_param_and_redirect(conn) do + uri_without_static_param = + conn + |> current_url() + |> UriHelper.modify_uri_params(%{}, ["static"]) + + redirect(conn, external: uri_without_static_param) + end + + defp fallback_on_preview_error(conn, media_proxy_url) do + redirect(conn, external: media_proxy_url) + end + + defp put_preview_response_headers( + conn, + [content_type, filename] = _content_info \\ ["image/jpeg", "preview.jpg"] + ) do + conn + |> put_resp_header("content-type", content_type) + |> put_resp_header("content-disposition", "inline; filename=\"#{filename}\"") + |> put_resp_header("cache-control", ReverseProxy.default_cache_control_header()) + end + + defp thumbnail_max_dimensions do + config = media_preview_proxy_config() + + thumbnail_max_width = Keyword.fetch!(config, :thumbnail_max_width) + thumbnail_max_height = Keyword.fetch!(config, :thumbnail_max_height) + + {thumbnail_max_width, thumbnail_max_height} + end + + defp min_content_length_for_preview do + Keyword.get(media_preview_proxy_config(), :min_content_length, 0) + end + + defp media_preview_proxy_config do + Config.get!([:media_preview_proxy]) + end - defp does_not_match(path, filename) do - basename = Path.basename(path) - basename != filename and URI.decode(basename) != filename and URI.encode(basename) != filename + defp media_proxy_opts do + Config.get([:media_proxy, :proxy_opts], []) end end |