qb_akkoma/lib/pleroma/plugs/oauth_scopes_plug.ex

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# Pleroma: A lightweight social networking server
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Plugs.OAuthScopesPlug do
import Plug.Conn
import Pleroma.Web.Gettext
@behaviour Plug
def init(%{scopes: _} = options), do: options
def call(%Plug.Conn{assigns: assigns} = conn, %{scopes: scopes} = options) do
op = options[:op] || :|
token = assigns[:token]
cond do
is_nil(token) ->
conn
op == :| && scopes -- token.scopes != scopes ->
conn
op == :& && scopes -- token.scopes == [] ->
conn
options[:fallback] == :proceed_unauthenticated ->
conn
|> assign(:user, nil)
|> assign(:token, nil)
true ->
missing_scopes = scopes -- token.scopes
permissions = Enum.join(missing_scopes, " #{op} ")
error_message =
dgettext("errors", "Insufficient permissions: %{permissions}.", permissions: permissions)
conn
|> put_resp_content_type("application/json")
|> send_resp(:forbidden, Jason.encode!(%{error: error_message}))
|> halt()
end
end
end