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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
   8   @behaviour Plug
   9
  10   def init(%{scopes: _} = options), do: options
  11
  12   def call(%Plug.Conn{assigns: assigns} = conn, %{scopes: scopes} = options) do
  13     op = options[:op] || :|
  14     token = assigns[:token]
  15
  16     cond do
  17       is_nil(token) ->
  18         conn
  19
  20       op == :| && scopes -- token.scopes != scopes ->
  21         conn
  22
  23       op == :& && scopes -- token.scopes == [] ->
  24         conn
  25
  26       options[:fallback] == :proceed_unauthenticated ->
  27         conn
  28         |> assign(:user, nil)
  29         |> assign(:token, nil)
  30
  31       true ->
  32         missing_scopes = scopes -- token.scopes
  33         error_message = "Insufficient permissions: #{Enum.join(missing_scopes, " #{op} ")}."
  34
  35         conn
  36         |> put_resp_content_type("application/json")
  37         |> send_resp(403, Jason.encode!(%{error: error_message}))
  38         |> halt()
  39     end
  40   end
  41 end