<?php
 use Google\Auth\CredentialsLoader;
 use Google\Auth\HttpHandler\HttpHandlerFactory;
 use Google\Auth\FetchAuthTokenCache;
 use Google\Auth\Middleware\AuthTokenMiddleware;
 use Google\Auth\Middleware\ScopedAccessTokenMiddleware;
 use Google\Auth\Middleware\SimpleMiddleware;
 use GuzzleHttp\Client;
 use GuzzleHttp\ClientInterface;
 use Psr\Cache\CacheItemPoolInterface;
 class Google_AuthHandler_Guzzle6AuthHandler {
 protected $cache;
 protected $cacheConfig;
 public function __construct(CacheItemPoolInterface $cache = null, array $cacheConfig = []) {
 $this->cache = $cache;
 $this->cacheConfig = $cacheConfig;
 }
 public function attachCredentials( ClientInterface $http, CredentialsLoader $credentials, callable $tokenCallback = null ) {
 if ($this->cache) {
 $credentials = new FetchAuthTokenCache( $credentials, $this->cacheConfig, $this->cache );
 }
 $authHttp = $this->createAuthHttp($http);
 $authHttpHandler = HttpHandlerFactory::build($authHttp);
 $middleware = new AuthTokenMiddleware( $credentials, $authHttpHandler, $tokenCallback );
 $config = $http->getConfig();
 $config['handler']->remove('google_auth');
 $config['handler']->push($middleware, 'google_auth');
 $config['auth'] = 'google_auth';
 $http = new Client($config);
 return $http;
 }
 public function attachToken(ClientInterface $http, array $token, array $scopes) {
 $tokenFunc = function ($scopes) use ($token) {
 return $token['access_token'];
 }
;
 $middleware = new ScopedAccessTokenMiddleware( $tokenFunc, $scopes, $this->cacheConfig, $this->cache );
 $config = $http->getConfig();
 $config['handler']->remove('google_auth');
 $config['handler']->push($middleware, 'google_auth');
 $config['auth'] = 'scoped';
 $http = new Client($config);
 return $http;
 }
 public function attachKey(ClientInterface $http, $key) {
 $middleware = new SimpleMiddleware(['key' => $key]);
 $config = $http->getConfig();
 $config['handler']->remove('google_auth');
 $config['handler']->push($middleware, 'google_auth');
 $config['auth'] = 'simple';
 $http = new Client($config);
 return $http;
 }
 private function createAuthHttp(ClientInterface $http) {
 return new Client( [ 'base_uri' => $http->getConfig('base_uri'), 'exceptions' => true, 'verify' => $http->getConfig('verify'), 'proxy' => $http->getConfig('proxy'), ] );
 }
 }
 