1<?php
2/*
3 * Copyright 2020 Google LLC
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 *     http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18namespace Google\Auth;
19
20/**
21 * Describes a Credentials object which supports fetching the project ID.
22 */
23interface ProjectIdProviderInterface
24{
25    /**
26     * Get the project ID.
27     *
28     * @param callable $httpHandler Callback which delivers psr7 request
29     * @return string|null
30     */
31    public function getProjectId(callable $httpHandler = null);
32}
33