# Pleroma: A lightweight social networking server # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/> # SPDX-License-Identifier: AGPL-3.0-only defmodule Pleroma.Web.Plugs.OAuthScopesPlug do import Plug.Conn import Pleroma.Web.Gettext alias Pleroma.Helpers.AuthHelper use Pleroma.Web, :plug def init(%{scopes: _} = options), do: options @impl true def perform(%Plug.Conn{assigns: assigns} = conn, %{scopes: scopes} = options) do op = options[:op] || :| token = assigns[:token] matched_scopes = (token && filter_descendants(scopes, token.scopes)) || [] cond do token && op == :| && Enum.any?(matched_scopes) -> conn token && op == :& && matched_scopes == scopes -> conn options[:fallback] == :proceed_unauthenticated -> AuthHelper.drop_auth_info(conn) true -> missing_scopes = scopes -- matched_scopes permissions = Enum.join(missing_scopes, " #{op} ") error_message = dgettext("errors", "Insufficient permissions: %{permissions}.", permissions: permissions) conn |> put_resp_content_type("application/json") |> send_resp(:forbidden, Jason.encode!(%{error: error_message})) |> halt() end end @doc "Keeps those of `scopes` which are descendants of `supported_scopes`" def filter_descendants(scopes, supported_scopes) do Enum.filter( scopes, fn scope -> Enum.find( supported_scopes, &(scope == &1 || String.starts_with?(scope, &1 <> ":")) ) end ) end end