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<?php
/*
* Copyright 2023 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;
use Google\Auth\CredentialSource\AwsNativeSource;
use Google\Auth\CredentialSource\FileSource;
use Google\Auth\CredentialSource\UrlSource;
use Google\Auth\ExternalAccountCredentialSourceInterface;
use Google\Auth\FetchAuthTokenInterface;
use Google\Auth\GetQuotaProjectInterface;
use Google\Auth\HttpHandler\HttpClientCache;
use Google\Auth\HttpHandler\HttpHandlerFactory;
use Google\Auth\OAuth2;
use Google\Auth\UpdateMetadataInterface;
use Google\Auth\UpdateMetadataTrait;
use GuzzleHttp\Psr7\Request;
use InvalidArgumentException;
class ExternalAccountCredentials implements FetchAuthTokenInterface, UpdateMetadataInterface, GetQuotaProjectInterface
{
use UpdateMetadataTrait;
private const EXTERNAL_ACCOUNT_TYPE = 'external_account';
private OAuth2 $auth;
private ?string $quotaProject;
private ?string $serviceAccountImpersonationUrl;
/**
* @param string|string[] $scope The scope of the access request, expressed either as an array
* or as a space-delimited string.
* @param array<mixed> $jsonKey JSON credentials as an associative array.
*/
public function __construct(
$scope,
array $jsonKey
) {
if (!array_key_exists('type', $jsonKey)) {
throw new InvalidArgumentException('json key is missing the type field');
}
if ($jsonKey['type'] !== self::EXTERNAL_ACCOUNT_TYPE) {
throw new InvalidArgumentException(sprintf(
'expected "%s" type but received "%s"',
self::EXTERNAL_ACCOUNT_TYPE,
$jsonKey['type']
));
}
if (!array_key_exists('token_url', $jsonKey)) {
throw new InvalidArgumentException(
'json key is missing the token_url field'
);
}
if (!array_key_exists('audience', $jsonKey)) {
throw new InvalidArgumentException(
'json key is missing the audience field'
);
}
if (!array_key_exists('subject_token_type', $jsonKey)) {
throw new InvalidArgumentException(
'json key is missing the subject_token_type field'
);
}
if (!array_key_exists('credential_source', $jsonKey)) {
throw new InvalidArgumentException(
'json key is missing the credential_source field'
);
}
if (array_key_exists('service_account_impersonation_url', $jsonKey)) {
$this->serviceAccountImpersonationUrl = $jsonKey['service_account_impersonation_url'];
}
$this->quotaProject = $jsonKey['quota_project_id'] ?? null;
$this->auth = new OAuth2([
'tokenCredentialUri' => $jsonKey['token_url'],
'audience' => $jsonKey['audience'],
'scope' => $scope,
'subjectTokenType' => $jsonKey['subject_token_type'],
'subjectTokenFetcher' => self::buildCredentialSource($jsonKey),
]);
}
/**
* @param array<mixed> $jsonKey
*/
private static function buildCredentialSource(array $jsonKey): ExternalAccountCredentialSourceInterface
{
$credentialSource = $jsonKey['credential_source'];
if (isset($credentialSource['file'])) {
return new FileSource(
$credentialSource['file'],
$credentialSource['format']['type'] ?? null,
$credentialSource['format']['subject_token_field_name'] ?? null
);
}
if (
isset($credentialSource['environment_id'])
&& 1 === preg_match('/^aws(\d+)$/', $credentialSource['environment_id'], $matches)
) {
if ($matches[1] !== '1') {
throw new InvalidArgumentException(
"aws version \"$matches[1]\" is not supported in the current build."
);
}
if (!array_key_exists('regional_cred_verification_url', $credentialSource)) {
throw new InvalidArgumentException(
'The regional_cred_verification_url field is required for aws1 credential source.'
);
}
if (!array_key_exists('audience', $jsonKey)) {
throw new InvalidArgumentException(
'aws1 credential source requires an audience to be set in the JSON file.'
);
}
return new AwsNativeSource(
$jsonKey['audience'],
$credentialSource['regional_cred_verification_url'], // $regionalCredVerificationUrl
$credentialSource['region_url'] ?? null, // $regionUrl
$credentialSource['url'] ?? null, // $securityCredentialsUrl
$credentialSource['imdsv2_session_token_url'] ?? null, // $imdsV2TokenUrl
);
}
if (isset($credentialSource['url'])) {
return new UrlSource(
$credentialSource['url'],
$credentialSource['format']['type'] ?? null,
$credentialSource['format']['subject_token_field_name'] ?? null,
$credentialSource['headers'] ?? null,
);
}
throw new InvalidArgumentException('Unable to determine credential source from json key.');
}
/**
* @param string $stsToken
* @param callable $httpHandler
*
* @return array<mixed> {
* A set of auth related metadata, containing the following
*
* @type string $access_token
* @type int $expires_at
* }
*/
private function getImpersonatedAccessToken(string $stsToken, callable $httpHandler = null): array
{
if (!isset($this->serviceAccountImpersonationUrl)) {
throw new InvalidArgumentException(
'service_account_impersonation_url must be set in JSON credentials.'
);
}
$request = new Request(
'POST',
$this->serviceAccountImpersonationUrl,
[
'Content-Type' => 'application/json',
'Authorization' => 'Bearer ' . $stsToken,
],
(string) json_encode([
'lifetime' => sprintf('%ss', OAuth2::DEFAULT_EXPIRY_SECONDS),
'scope' => $this->auth->getScope(),
]),
);
if (is_null($httpHandler)) {
$httpHandler = HttpHandlerFactory::build(HttpClientCache::getHttpClient());
}
$response = $httpHandler($request);
$body = json_decode((string) $response->getBody(), true);
return [
'access_token' => $body['accessToken'],
'expires_at' => strtotime($body['expireTime']),
];
}
/**
* @param callable $httpHandler
*
* @return array<mixed> {
* A set of auth related metadata, containing the following
*
* @type string $access_token
* @type int $expires_at (impersonated service accounts only)
* @type int $expires_in (identity pool only)
* @type string $issued_token_type (identity pool only)
* @type string $token_type (identity pool only)
* }
*/
public function fetchAuthToken(callable $httpHandler = null)
{
$stsToken = $this->auth->fetchAuthToken($httpHandler);
if (isset($this->serviceAccountImpersonationUrl)) {
return $this->getImpersonatedAccessToken($stsToken['access_token'], $httpHandler);
}
return $stsToken;
}
public function getCacheKey()
{
return $this->auth->getCacheKey();
}
public function getLastReceivedToken()
{
return $this->auth->getLastReceivedToken();
}
/**
* Get the quota project used for this API request
*
* @return string|null
*/
public function getQuotaProject()
{
return $this->quotaProject;
}
}