akkoma/lib/pleroma/web/plugs/uploaded_media.ex

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# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.Plugs.UploadedMedia do
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@moduledoc """
"""
import Plug.Conn
import Pleroma.Web.Gettext
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require Logger
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alias Pleroma.Web.MediaProxy
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@behaviour Plug
# no slashes
@path "media"
@default_cache_control_header "public, max-age=1209600"
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def init(_opts) do
static_plug_opts =
[
headers: %{"cache-control" => @default_cache_control_header},
cache_control_for_etags: @default_cache_control_header
]
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|> Keyword.put(:from, "__unconfigured_media_plug")
|> Keyword.put(:at, "/__unconfigured_media_plug")
|> Plug.Static.init()
%{static_plug_opts: static_plug_opts}
end
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def call(%{request_path: <<"/", @path, "/", file::binary>>} = conn, opts) do
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conn =
case fetch_query_params(conn) do
%{query_params: %{"name" => name}} = conn ->
name = escape_header_value(name)
put_resp_header(conn, "content-disposition", ~s[inline; filename="#{name}"])
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conn ->
conn
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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with uploader <- Keyword.fetch!(config, :uploader),
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{:ok, get_method} <- uploader.get_file(file),
false <- media_is_banned(conn, get_method) do
get_media(conn, get_method, opts)
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else
_ ->
conn
|> send_resp(:internal_server_error, dgettext("errors", "Failed"))
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|> halt()
end
end
def call(conn, _opts), do: conn
defp media_is_banned(%{request_path: path} = _conn, {:static_dir, _}) do
MediaProxy.in_banned_urls(Pleroma.Upload.base_url() <> path)
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end
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 =
Map.get(opts, :static_plug_opts)
|> Map.put(:at, [@path])
|> Map.put(:from, directory)
conn = Plug.Static.call(conn, static_opts)
if conn.halted do
conn
else
conn
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|> send_resp(:not_found, dgettext("errors", "Not found"))
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|> halt()
end
end
defp get_media(conn, {:url, url}, _) do
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conn
|> Phoenix.Controller.redirect(external: url)
|> halt()
end
defp get_media(conn, unknown, _) do
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Logger.error("#{__MODULE__}: Unknown get startegy: #{inspect(unknown)}")
conn
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|> send_resp(:internal_server_error, dgettext("errors", "Internal Error"))
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|> halt()
end
defp escape_header_value(value) do
value
|> String.replace("\"", "\\\"")
|> String.replace("\\r", "")
|> String.replace("\\n", "")
end
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end