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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Plugs.OAuthScopesPlug do
   6   import Plug.Conn
   7   import Pleroma.Web.Gettext
   8
   9   @behaviour Plug
  10
  11   def init(%{scopes: _} = options), do: options
  12
  13   def call(%Plug.Conn{assigns: assigns} = conn, %{scopes: scopes} = options) do
  14     op = options[:op] || :|
  15     token = assigns[:token]
  16
  17     cond do
  18       is_nil(token) ->
  19         conn
  20
  21       op == :| && scopes -- token.scopes != scopes ->
  22         conn
  23
  24       op == :& && scopes -- token.scopes == [] ->
  25         conn
  26
  27       options[:fallback] == :proceed_unauthenticated ->
  28         conn
  29         |> assign(:user, nil)
  30         |> assign(:token, nil)
  31
  32       true ->
  33         missing_scopes = scopes -- token.scopes
  34         permissions = Enum.join(missing_scopes, " #{op} ")
  35
  36         error_message =
  37           dgettext("errors", "Insufficient permissions: %{permissions}.", permissions: permissions)
  38
  39         conn
  40         |> put_resp_content_type("application/json")
  41         |> send_resp(:forbidden, Jason.encode!(%{error: error_message}))
  42         |> halt()
  43     end
  44   end
  45 end