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<?php
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/*
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* Copyright 2015 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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namespace Google\Auth\Credentials;
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/**
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* Authenticates requests using IAM credentials.
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*/
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class IAMCredentials
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{
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const SELECTOR_KEY = 'x-goog-iam-authority-selector';
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const TOKEN_KEY = 'x-goog-iam-authorization-token';
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/**
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* @var string
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*/
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private $selector;
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/**
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* @var string
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*/
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private $token;
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/**
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* @param $selector string the IAM selector
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* @param $token string the IAM token
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*/
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public function __construct($selector, $token)
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{
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if (!is_string($selector)) {
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throw new \InvalidArgumentException(
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'selector must be a string');
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}
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if (!is_string($token)) {
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throw new \InvalidArgumentException(
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'token must be a string');
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}
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$this->selector = $selector;
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$this->token = $token;
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}
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/**
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* export a callback function which updates runtime metadata.
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*
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* @return array updateMetadata function
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*/
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public function getUpdateMetadataFunc()
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{
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return array($this, 'updateMetadata');
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}
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/**
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* Updates metadata with the appropriate header metadata.
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*
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* @param array $metadata metadata hashmap
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* @param string $unusedAuthUri optional auth uri
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* @param callable $httpHandler callback which delivers psr7 request
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* Note: this param is unused here, only included here for
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* consistency with other credentials class
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*
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* @return array updated metadata hashmap
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*/
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public function updateMetadata(
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$metadata,
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$unusedAuthUri = null,
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callable $httpHandler = null
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) {
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$metadata_copy = $metadata;
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$metadata_copy[self::SELECTOR_KEY] = $this->selector;
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$metadata_copy[self::TOKEN_KEY] = $this->token;
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return $metadata_copy;
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}
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}
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