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<?php
/*
* Copyright 2015 Google Inc.
*
* 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\Credentials;
/**
* Authenticates requests using IAM credentials.
*/
class IAMCredentials
{
const SELECTOR_KEY = 'x-goog-iam-authority-selector';
const TOKEN_KEY = 'x-goog-iam-authorization-token';
/**
* @var string
*/
private $selector;
/**
* @var string
*/
private $token;
/**
* @param $selector string the IAM selector
* @param $token string the IAM token
*/
public function __construct($selector, $token)
{
if (!is_string($selector)) {
throw new \InvalidArgumentException(
'selector must be a string'
);
}
if (!is_string($token)) {
throw new \InvalidArgumentException(
'token must be a string'
);
}
$this->selector = $selector;
$this->token = $token;
}
/**
* export a callback function which updates runtime metadata.
*
* @return array updateMetadata function
*/
public function getUpdateMetadataFunc()
{
return array($this, 'updateMetadata');
}
/**
* Updates metadata with the appropriate header metadata.
*
* @param array $metadata metadata hashmap
* @param string $unusedAuthUri optional auth uri
* @param callable $httpHandler callback which delivers psr7 request
* Note: this param is unused here, only included here for
* consistency with other credentials class
*
* @return array updated metadata hashmap
*/
public function updateMetadata(
$metadata,
$unusedAuthUri = null,
callable $httpHandler = null
) {
$metadata_copy = $metadata;
$metadata_copy[self::SELECTOR_KEY] = $this->selector;
$metadata_copy[self::TOKEN_KEY] = $this->token;
return $metadata_copy;
}
}