git.squeep.com Git - akkoma/blob - lib/pleroma/web/o_auth/scopes.ex

   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Web.OAuth.Scopes do
   6   @moduledoc """
   7   Functions for dealing with scopes.
   8   """
   9
  10   alias Pleroma.Web.Plugs.OAuthScopesPlug
  11
  12   @doc """
  13   Fetch scopes from request params.
  14
  15   Note: `scopes` is used by Mastodon — supporting it but sticking to
  16   OAuth's standard `scope` wherever we control it
  17   """
  18   @spec fetch_scopes(map() | struct(), list()) :: list()
  19
  20   def fetch_scopes(params, default) do
  21     parse_scopes(params["scope"] || params["scopes"] || params[:scopes], default)
  22   end
  23
  24   def parse_scopes(scopes, _default) when is_list(scopes) do
  25     Enum.filter(scopes, &(&1 not in [nil, ""]))
  26   end
  27
  28   def parse_scopes(scopes, default) when is_binary(scopes) do
  29     scopes
  30     |> to_list
  31     |> parse_scopes(default)
  32   end
  33
  34   def parse_scopes(_, default) do
  35     default
  36   end
  37
  38   @doc """
  39   Convert scopes string to list
  40   """
  41   @spec to_list(binary()) :: [binary()]
  42   def to_list(nil), do: []
  43
  44   def to_list(str) do
  45     str
  46     |> String.trim()
  47     |> String.split(~r/[\s,]+/)
  48   end
  49
  50   @doc """
  51   Convert scopes list to string
  52   """
  53   @spec to_string(list()) :: binary()
  54   def to_string(scopes), do: Enum.join(scopes, " ")
  55
  56   @doc """
  57   Validates scopes.
  58   """
  59   @spec validate(list() | nil, list(), Pleroma.User.t()) ::
  60           {:ok, list()} | {:error, :missing_scopes | :unsupported_scopes, :user_is_not_an_admin}
  61   def validate(blank_scopes, _app_scopes, _user) when blank_scopes in [nil, []],
  62     do: {:error, :missing_scopes}
  63
  64   def validate(scopes, app_scopes, %Pleroma.User{is_admin: is_admin}) do
  65     if !is_admin && contains_admin_scopes?(scopes) do
  66       {:error, :user_is_not_an_admin}
  67     else
  68       validate_scopes_are_supported(scopes, app_scopes)
  69     end
  70   end
  71
  72   defp validate_scopes_are_supported(scopes, app_scopes) do
  73     case OAuthScopesPlug.filter_descendants(scopes, app_scopes) do
  74       ^scopes -> {:ok, scopes}
  75       _ -> {:error, :unsupported_scopes}
  76     end
  77   end
  78
  79   def contains_admin_scopes?(scopes) do
  80     scopes
  81     |> OAuthScopesPlug.filter_descendants(["admin"])
  82     |> Enum.any?()
  83   end
  84 end