# Install Composercurl -sS https://getcomposer.org/installer | php

composer.phar require google/auth

use Google\Auth\ApplicationDefaultCredentials;use GuzzleHttp\Client;use GuzzleHttp\HandlerStack;// specify the path to your application credentialsputenv('GOOGLE_APPLICATION_CREDENTIALS=/path/to/my/credentials.json');// define the scopes for your API call$scopes = ['https://www.googleapis.com/auth/drive.readonly'];// create middleware$middleware = ApplicationDefaultCredentials::getMiddleware($scopes);$stack = HandlerStack::create();$stack->push($middleware);// create the HTTP client$client = new Client([  'handler' => $stack,  'base_uri' => 'https://www.googleapis.com',  'auth' => 'google_auth'  // authorize all requests]);// make the request$response = $client->get('drive/v2/files');// show the result!print_r((string) $response->getBody());

// create the HTTP client$client = new Client([  'base_url' => 'https://www.googleapis.com',  'auth' => 'google_auth'  // authorize all requests]);// create subscriber$subscriber = ApplicationDefaultCredentials::getSubscriber($scopes);$client->getEmitter()->attach($subscriber);

use Google\Auth\ApplicationDefaultCredentials;use GuzzleHttp\Client;use GuzzleHttp\HandlerStack;// specify the path to your application credentialsputenv('GOOGLE_APPLICATION_CREDENTIALS=/path/to/my/credentials.json');// Provide the ID token audience. This can be a Client ID associated with an IAP application,// Or the URL associated with a CloudRun App//    $targetAudience = 'IAP_CLIENT_ID.apps.googleusercontent.com';//    $targetAudience = 'https://service-1234-uc.a.run.app';$targetAudience = 'YOUR_ID_TOKEN_AUDIENCE';// create middleware$middleware = ApplicationDefaultCredentials::getIdTokenMiddleware($targetAudience);$stack = HandlerStack::create();$stack->push($middleware);// create the HTTP client$client = new Client([  'handler' => $stack,  'auth' => 'google_auth',  // Cloud Run, IAP, or custom resource URL  'base_uri' => 'https://YOUR_PROTECTED_RESOURCE',]);// make the request$response = $client->get('/');// show the result!print_r((string) $response->getBody());

use Google\Auth\CredentialsLoader;use Google\Auth\Middleware\AuthTokenMiddleware;use GuzzleHttp\Client;use GuzzleHttp\HandlerStack;// Define the Google Application Credentials array$jsonKey = ['key' => 'value'];// define the scopes for your API call$scopes = ['https://www.googleapis.com/auth/drive.readonly'];// Load credentials from JSON containing service account credentials.$creds = new ServiceAccountCredentials($scopes, $jsonKey),// For other credentials types, create those classes explicitly using the// "type" field in the JSON key, for example:$creds = match ($jsonKey['type']) {    'service_account' => new ServiceAccountCredentials($scope, $jsonKey),    'authorized_user' => new UserRefreshCredentials($scope, $jsonKey),    default => throw new InvalidArgumentException('This application only supports service account and user account credentials'),};// optional caching$creds = new FetchAuthTokenCache($creds, $cacheConfig, $cache);// create middleware$middleware = new AuthTokenMiddleware($creds);$stack = HandlerStack::create();$stack->push($middleware);// create the HTTP client$client = new Client([  'handler' => $stack,  'base_uri' => 'https://www.googleapis.com',  'auth' => 'google_auth'  // authorize all requests]);// make the request$response = $client->get('drive/v2/files');// show the result!print_r((string) $response->getBody());

use Google\Auth\ApplicationDefaultCredentials;use GuzzleHttp\Client;use GuzzleHttp\HandlerStack;// specify the path to your application credentialsputenv('GOOGLE_APPLICATION_CREDENTIALS=/path/to/my/credentials.json');// Provide the ID token audience. This can be a Client ID associated with an IAP application//    $targetAudience = 'IAP_CLIENT_ID.apps.googleusercontent.com';$targetAudience = 'YOUR_ID_TOKEN_AUDIENCE';// create middleware$middleware = ApplicationDefaultCredentials::getProxyIdTokenMiddleware($targetAudience);$stack = HandlerStack::create();$stack->push($middleware);// create the HTTP client$client = new Client([  'handler' => $stack,  'auth' => ['username', 'pass'], // auth option handled by your application  'proxy_auth' => 'google_auth',]);// make the request$response = $client->get('/');// show the result!print_r((string) $response->getBody());

use Google\Auth\AccessToken;$auth = new AccessToken();$auth->verify($idToken);

use Google\Auth\AccessToken;$auth = new AccessToken();$auth->verify($idToken, [  'certsLocation' => AccessToken::IAP_CERT_URL]);

use Google\Auth\ApplicationDefaultCredentials;use Google\Auth\Cache\MemoryCacheItemPool;// Cache Instance$memoryCache = new MemoryCacheItemPool;// Get the credentials// From here, the credentials will cache the access token$middleware = ApplicationDefaultCredentials::getCredentials($scope, cache: $memoryCache);

use Google\Auth\Cache\FileSystemCacheItemPool;use Google\Auth\ApplicationDefaultCredentials;// Create a Cache pool instance$cache = new FileSystemCacheItemPool(__DIR__ . '/cache');// Pass your Cache to the Auth Library$credentials = ApplicationDefaultCredentials::getCredentials($scope, cache: $cache);// This token will be cached and be able to be used for the next request$token = $credentials->fetchAuthToken();

// run "composer require symfony/cache"use Google\Auth\ApplicationDefaultCredentials;use Symfony\Component\Cache\Adapter\FilesystemAdapter;// Create the cache instance$filesystemCache = new FilesystemAdapter();// Create Get the credentials$credentials = ApplicationDefaultCredentials::getCredentials($targetAudience, cache: $filesystemCache);