# 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
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, [], [], name: MyFinch) 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
projects / akkoma / blobdiff