# Pleroma: A lightweight social networking server # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/> # SPDX-License-Identifier: AGPL-3.0-only defmodule Pleroma.Plugs.OAuthPlug do import Plug.Conn import Ecto.Query alias Pleroma.Repo alias Pleroma.User alias Pleroma.Web.OAuth.App alias Pleroma.Web.OAuth.Token @realm_reg Regex.compile!("Bearer\:?\s+(.*)$", "i") def init(options), do: options def call(%{assigns: %{user: %User{}}} = conn, _), do: conn def call(%{params: %{"access_token" => access_token}} = conn, _) do with {:ok, user, token_record} <- fetch_user_and_token(access_token) do conn |> assign(:token, token_record) |> assign(:user, user) else _ -> # token found, but maybe only with app with {:ok, app, token_record} <- fetch_app_and_token(access_token) do conn |> assign(:token, token_record) |> assign(:app, app) else _ -> conn end end end def call(conn, _) do case fetch_token_str(conn) do {:ok, token} -> with {:ok, user, token_record} <- fetch_user_and_token(token) do conn |> assign(:token, token_record) |> assign(:user, user) else _ -> # token found, but maybe only with app with {:ok, app, token_record} <- fetch_app_and_token(token) do conn |> assign(:token, token_record) |> assign(:app, app) else _ -> conn end end _ -> conn end end # Gets user by token # @spec fetch_user_and_token(String.t()) :: {:ok, User.t(), Token.t()} | nil defp fetch_user_and_token(token) do query = from(t in Token, where: t.token == ^token, join: user in assoc(t, :user), preload: [user: user] ) # credo:disable-for-next-line Credo.Check.Readability.MaxLineLength with %Token{user: user} = token_record <- Repo.one(query) do {:ok, user, token_record} end end @spec fetch_app_and_token(String.t()) :: {:ok, App.t(), Token.t()} | nil defp fetch_app_and_token(token) do query = from(t in Token, where: t.token == ^token, join: app in assoc(t, :app), preload: [app: app]) with %Token{app: app} = token_record <- Repo.one(query) do {:ok, app, token_record} end end # Gets token from session by :oauth_token key # @spec fetch_token_from_session(Plug.Conn.t()) :: :no_token_found | {:ok, String.t()} defp fetch_token_from_session(conn) do case get_session(conn, :oauth_token) do nil -> :no_token_found token -> {:ok, token} end end # Gets token from headers # @spec fetch_token_str(Plug.Conn.t()) :: :no_token_found | {:ok, String.t()} defp fetch_token_str(%Plug.Conn{} = conn) do headers = get_req_header(conn, "authorization") with :no_token_found <- fetch_token_str(headers), do: fetch_token_from_session(conn) end @spec fetch_token_str(Keyword.t()) :: :no_token_found | {:ok, String.t()} defp fetch_token_str([]), do: :no_token_found defp fetch_token_str([token | tail]) do trimmed_token = String.trim(token) case Regex.run(@realm_reg, trimmed_token) do [_, match] -> {:ok, String.trim(match)} _ -> fetch_token_str(tail) end end end