# Pleroma: A lightweight social networking server
-# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.MediaProxy.MediaProxyController do
alias Pleroma.Config
alias Pleroma.Helpers.MediaHelper
+ alias Pleroma.Helpers.UriHelper
alias Pleroma.ReverseProxy
alias Pleroma.Web.MediaProxy
alias Plug.Conn
def preview(%Conn{} = conn, %{"sig" => sig64, "url" => url64}) do
with {_, true} <- {:enabled, MediaProxy.preview_enabled?()},
- {:ok, url} <- MediaProxy.decode_url(sig64, url64) do
+ {:ok, url} <- MediaProxy.decode_url(sig64, url64),
+ :ok <- MediaProxy.verify_request_path_and_url(conn, url) do
handle_preview(conn, url)
else
{:enabled, false} ->
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")
- handle_preview(content_type, conn, media_proxy_url)
+ 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}).")
end
end
- defp handle_preview(
- "image/" <> _ = _content_type,
- %{params: %{"output_format" => "jpeg"}} = conn,
- media_proxy_url
- ) do
- handle_jpeg_preview(conn, media_proxy_url)
- end
-
- defp handle_preview("image/gif" = _content_type, conn, media_proxy_url) do
- redirect(conn, external: media_proxy_url)
- end
-
defp handle_preview("image/png" <> _ = _content_type, conn, media_proxy_url) do
handle_png_preview(conn, media_proxy_url)
end
handle_video_preview(conn, media_proxy_url)
end
- defp handle_preview(content_type, conn, _media_proxy_url) do
- send_resp(conn, :unprocessable_entity, "Unsupported content type: #{content_type}.")
+ 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 {thumbnail_max_width, thumbnail_max_height} <- thumbnail_max_dimensions(),
- {:ok, thumbnail_binary} <-
+ with {:ok, thumbnail_binary} <-
MediaHelper.image_resize(
media_proxy_url,
%{
|> send_resp(200, thumbnail_binary)
else
_ ->
- send_resp(conn, :failed_dependency, "Can't handle preview.")
+ 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()
- with {thumbnail_max_width, thumbnail_max_height} <- thumbnail_max_dimensions(),
- {:ok, thumbnail_binary} <-
+ with {:ok, thumbnail_binary} <-
MediaHelper.image_resize(
media_proxy_url,
%{max_width: thumbnail_max_width, max_height: thumbnail_max_height, quality: quality}
|> send_resp(200, thumbnail_binary)
else
_ ->
- send_resp(conn, :failed_dependency, "Can't handle preview.")
+ fallback_on_preview_error(conn, media_proxy_url)
end
end
|> send_resp(200, thumbnail_binary)
else
_ ->
- send_resp(conn, :failed_dependency, "Can't handle preview.")
+ 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"]
|> put_resp_header("cache-control", ReverseProxy.default_cache_control_header())
end
- defp thumbnail_max_dimensions() do
- config = Config.get([:media_preview_proxy], [])
+ 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 media_proxy_opts do
Config.get([:media_proxy, :proxy_opts], [])
end