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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Web.Plugs.SessionAuthenticationPlug do
   6   @moduledoc """
   7   Authenticates user by session-stored `:user_id` and request-contained username.
   8   Username can be provided via HTTP Basic Auth (the password is not checked and can be anything).
   9   """
  10
  11   import Plug.Conn
  12
  13   alias Pleroma.Helpers.AuthHelper
  14
  15   def init(options) do
  16     options
  17   end
  18
  19   def call(%{assigns: %{user: %Pleroma.User{}}} = conn, _), do: conn
  20
  21   def call(conn, _) do
  22     with saved_user_id <- get_session(conn, :user_id),
  23          %{auth_user: %{id: ^saved_user_id}} <- conn.assigns do
  24       conn
  25       |> assign(:user, conn.assigns.auth_user)
  26       |> AuthHelper.skip_oauth()
  27     else
  28       _ -> conn
  29     end
  30   end
  31 end