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<?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\Middleware; use Google\Auth\CacheTrait; use Google\Auth\FetchAuthTokenInterface; use Psr\Cache\CacheItemPoolInterface; use Psr\Http\Message\RequestInterface; /** * AuthTokenMiddleware is a Guzzle Middleware that adds an Authorization header * provided by an object implementing FetchAuthTokenInterface. * * The FetchAuthTokenInterface#fetchAuthToken is used to obtain a hash; one of * the values value in that hash is added as the authorization header. * * Requests will be accessed with the authorization header: * * 'Authorization' 'Bearer <value of auth_token>' */ class AuthTokenMiddleware { use CacheTrait; const DEFAULT_CACHE_LIFETIME = 1500; /** * @var CacheItemPoolInterface */ private $cache; /** * @var callback */ private $httpHandler; /** * @var FetchAuthTokenInterface */ private $fetcher; /** * @var array configuration */ private $cacheConfig; /** * @var callable */ private $tokenCallback; /** * Creates a new AuthTokenMiddleware. * * @param FetchAuthTokenInterface $fetcher is used to fetch the auth token * @param array $cacheConfig configures the cache * @param CacheItemPoolInterface $cache (optional) caches the token. * @param callable $httpHandler (optional) callback which delivers psr7 request * @param callable $tokenCallback (optional) function to be called when a new token is fetched. */ public function __construct( FetchAuthTokenInterface $fetcher, array $cacheConfig = null, CacheItemPoolInterface $cache = null, callable $httpHandler = null, callable $tokenCallback = null ) { $this->fetcher = $fetcher; $this->httpHandler = $httpHandler; $this->tokenCallback = $tokenCallback; if (!is_null($cache)) { $this->cache = $cache; $this->cacheConfig = array_merge([ 'lifetime' => self::DEFAULT_CACHE_LIFETIME, 'prefix' => '', ], $cacheConfig); } } /** * Updates the request with an Authorization header when auth is 'google_auth'. * * use Google\Auth\Middleware\AuthTokenMiddleware; * use Google\Auth\OAuth2; * use GuzzleHttp\Client; * use GuzzleHttp\HandlerStack; * * $config = [..<oauth config param>.]; * $oauth2 = new OAuth2($config) * $middleware = new AuthTokenMiddleware( * $oauth2, * ['prefix' => 'OAuth2::'], * $cache = new Memcache() * ); * $stack = HandlerStack::create(); * $stack->push($middleware); * * $client = new Client([ * 'handler' => $stack, * 'base_uri' => 'https://www.googleapis.com/taskqueue/v1beta2/projects/', * 'auth' => 'google_auth' // authorize all requests * ]); * * $res = $client->get('myproject/taskqueues/myqueue'); * * @param callable $handler * * @return \Closure */ public function __invoke(callable $handler) { return function (RequestInterface $request, array $options) use ($handler) { // Requests using "auth"="google_auth" will be authorized. if (!isset($options['auth']) || $options['auth'] !== 'google_auth') { return $handler($request, $options); } $request = $request->withHeader('Authorization', 'Bearer ' . $this->fetchToken()); return $handler($request, $options); }; } /** * Determine if token is available in the cache, if not call fetcher to * fetch it. * * @return string */ private function fetchToken() { // TODO: correct caching; update the call to setCachedValue to set the expiry // to the value returned with the auth token. // // TODO: correct caching; enable the cache to be cleared. $cached = $this->getCachedValue(); if (!empty($cached)) { return $cached; } $auth_tokens = $this->fetcher->fetchAuthToken($this->httpHandler); if (array_key_exists('access_token', $auth_tokens)) { $this->setCachedValue($auth_tokens['access_token']); // notify the callback if applicable if ($this->tokenCallback) { call_user_func($this->tokenCallback, $this->getFullCacheKey(), $auth_tokens['access_token']); } return $auth_tokens['access_token']; } } }
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