134 lines
3.5 KiB
Elixir
134 lines
3.5 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.Plugs.UploadedMedia do
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@moduledoc """
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"""
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import Plug.Conn
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import Pleroma.Web.Gettext
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require Logger
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alias Pleroma.Web.MediaProxy
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@behaviour Plug
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# no slashes
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@path "media"
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@default_cache_control_header "public, max-age=1209600"
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def init(_opts) do
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static_plug_opts =
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[
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headers: %{"cache-control" => @default_cache_control_header},
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cache_control_for_etags: @default_cache_control_header
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]
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|> Keyword.put(:from, "__unconfigured_media_plug")
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|> Keyword.put(:at, "/__unconfigured_media_plug")
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|> Plug.Static.init()
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%{static_plug_opts: static_plug_opts}
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end
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def call(%{request_path: <<"/", @path, "/", file::binary>>} = conn, opts) do
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conn =
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case fetch_query_params(conn) do
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%{query_params: %{"name" => name}} = conn ->
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name = String.replace(name, ~s["], ~s[\\"])
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put_resp_header(conn, "content-disposition", ~s[inline; filename="#{name}"])
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conn ->
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conn
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end
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|> merge_resp_headers([{"content-security-policy", "sandbox"}])
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config = Pleroma.Config.get(Pleroma.Upload)
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%{scheme: media_scheme, host: media_host, port: media_port} =
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Pleroma.Upload.base_url() |> URI.parse()
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with {:valid_host, true} <- {:valid_host, match?(^media_host, conn.host)},
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uploader <- Keyword.fetch!(config, :uploader),
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proxy_remote = Keyword.get(config, :proxy_remote, false),
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{:ok, get_method} <- uploader.get_file(file),
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false <- media_is_banned(conn, get_method) do
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get_media(conn, get_method, proxy_remote, opts)
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else
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{:valid_host, false} ->
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redirect_url =
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%URI{
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scheme: media_scheme,
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host: media_host,
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port: media_port,
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path: conn.request_path,
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query: conn.query_string
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}
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|> URI.to_string()
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|> String.trim_trailing("?")
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conn
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|> Phoenix.Controller.redirect(external: redirect_url)
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|> halt()
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_ ->
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conn
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|> send_resp(:internal_server_error, dgettext("errors", "Failed"))
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|> halt()
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end
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end
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def call(conn, _opts), do: conn
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defp media_is_banned(%{request_path: path} = _conn, {:static_dir, _}) do
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MediaProxy.in_banned_urls(Pleroma.Upload.base_url() <> path)
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end
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defp media_is_banned(_, {:url, url}), do: MediaProxy.in_banned_urls(url)
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defp media_is_banned(_, _), do: false
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defp get_media(conn, {:static_dir, directory}, _, opts) do
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static_opts =
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Map.get(opts, :static_plug_opts)
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|> Map.put(:at, [@path])
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|> Map.put(:from, directory)
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conn = Plug.Static.call(conn, static_opts)
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if conn.halted do
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conn
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else
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conn
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|> send_resp(:not_found, dgettext("errors", "Not found"))
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|> halt()
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end
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end
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defp get_media(conn, {:url, url}, true, _) do
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proxy_opts = [
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http: [
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follow_redirect: true,
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pool: :upload
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]
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]
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conn
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|> Pleroma.ReverseProxy.call(url, proxy_opts)
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end
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defp get_media(conn, {:url, url}, _, _) do
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conn
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|> Phoenix.Controller.redirect(external: url)
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|> halt()
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end
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defp get_media(conn, unknown, _, _) do
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Logger.error("#{__MODULE__}: Unknown get startegy: #{inspect(unknown)}")
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conn
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|> send_resp(:internal_server_error, dgettext("errors", "Internal Error"))
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|> halt()
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end
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end
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