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✏️ Editing: IAMCredentials.php

<?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;
    }
}

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