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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\FetchAuthTokenInterface;
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
{
/**
* @var callback
*/
private $httpHandler;
/**
* @var FetchAuthTokenInterface
*/
private $fetcher;
/**
* @var callable
*/
private $tokenCallback;
/**
* Creates a new AuthTokenMiddleware.
*
* @param FetchAuthTokenInterface $fetcher is used to fetch the auth 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,
callable $httpHandler = null,
callable $tokenCallback = null
) {
$this->fetcher = $fetcher;
$this->httpHandler = $httpHandler;
$this->tokenCallback = $tokenCallback;
}
/**
* 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);
* $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);
};
}
/**
* Call fetcher to fetch the token.
*
* @return string
*/
private function fetchToken()
{
$auth_tokens = $this->fetcher->fetchAuthToken($this->httpHandler);
if (array_key_exists('access_token', $auth_tokens)) {
// notify the callback if applicable
if ($this->tokenCallback) {
call_user_func($this->tokenCallback, $this->fetcher->getCacheKey(), $auth_tokens['access_token']);
}
return $auth_tokens['access_token'];
}
}
}