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<?php
/*
* Copyright 2022 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;
use Exception;
use Google\Auth\HttpHandler\HttpClientCache;
use Google\Auth\HttpHandler\HttpHandlerFactory;
trait IamSignerTrait
{
/**
* @var Iam|null
*/
private $iam;
/**
* Sign a string using the default service account private key.
*
* This implementation uses IAM's signBlob API.
*
* @see https://cloud.google.com/iam/credentials/reference/rest/v1/projects.serviceAccounts/signBlob SignBlob
*
* @param string $stringToSign The string to sign.
* @param bool $forceOpenSsl [optional] Does not apply to this credentials
* type.
* @param string $accessToken The access token to use to sign the blob. If
* provided, saves a call to the metadata server for a new access
* token. **Defaults to** `null`.
* @return string
* @throws Exception
*/
public function signBlob($stringToSign, $forceOpenSsl = false, $accessToken = null)
{
$httpHandler = HttpHandlerFactory::build(HttpClientCache::getHttpClient());
// Providing a signer is useful for testing, but it's undocumented
// because it's not something a user would generally need to do.
$signer = $this->iam ?: new Iam($httpHandler);
$email = $this->getClientName($httpHandler);
if (is_null($accessToken)) {
$previousToken = $this->getLastReceivedToken();
$accessToken = $previousToken
? $previousToken['access_token']
: $this->fetchAuthToken($httpHandler)['access_token'];
}
return $signer->signBlob($email, $accessToken, $stringToSign);
}
}