<?php /* * Copyright 2020 Google LLC * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ namespace Google\Auth; /** * Describes a Credentials object which supports fetching the project ID. */ interface ProjectIdProviderInterface { /** * Get the project ID. * * @param callable $httpHandler Callback which delivers psr7 request * @return string|null */ public function getProjectId(callable $httpHandler = null); }