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<?php |
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namespace TreeHouse\Keystone\Client\Middleware; |
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use GuzzleHttp\Exception\ClientException; |
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use GuzzleHttp\Promise\PromiseInterface; |
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use GuzzleHttp\Promise\RejectedPromise; |
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use Psr\Http\Message\RequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use TreeHouse\Keystone\Client\RequestSigner; |
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class ReauthenticateMiddleware |
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{ |
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/** |
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* @var callable |
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*/ |
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protected $handler; |
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/** |
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* @var RequestSigner |
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*/ |
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protected $signer; |
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/** |
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* @param callable $handler |
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* @param RequestSigner $signer |
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*/ |
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public function __construct(callable $handler, RequestSigner $signer) |
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{ |
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$this->handler = $handler; |
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$this->signer = $signer; |
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} |
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/** |
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* @param RequestInterface $request |
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* @param array $options |
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* |
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* @return PromiseInterface |
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*/ |
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public function __invoke(RequestInterface $request, array $options) |
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{ |
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$fn = $this->handler; |
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return $fn($request, $options) |
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->then( |
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$this->onFulfilled($request, $options), |
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$this->onRejected($request, $options) |
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); |
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} |
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/** |
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* @param ResponseInterface $response |
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* |
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* @return bool |
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*/ |
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protected function isUnauthenticatedResponse(ResponseInterface $response) |
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{ |
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return in_array($response->getStatusCode(), [401, 403]); |
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} |
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/** |
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* @param RequestInterface $request |
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* |
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* @return bool |
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*/ |
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protected function reauthenticate(RequestInterface $request) |
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{ |
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return $this->signer->signRequest($request, true); |
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} |
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/** |
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* @param RequestInterface $request |
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* @param ResponseInterface $response |
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* @param array $options |
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* |
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* @return mixed |
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*/ |
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private function handleUnauthenticatedResponse(RequestInterface $request, ResponseInterface $response, array $options) |
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{ |
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if (!$this->isUnauthenticatedResponse($response)) { |
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return null; |
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} |
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$handler = $this->handler; |
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$newRequest = $this->reauthenticate($request); |
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return $handler($newRequest, $options); |
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} |
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/** |
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* @param RequestInterface $request |
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* @param array $options |
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* |
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* @return \Closure |
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*/ |
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private function onFulfilled(RequestInterface $request, array $options) |
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{ |
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return function (ResponseInterface $response) use ($request, $options) { |
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if ($next = $this->handleUnauthenticatedResponse($request, $response, $options)) { |
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return $next; |
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} |
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return $response; |
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}; |
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} |
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/** |
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* @param RequestInterface $request |
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* @param array $options |
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* |
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* @return \Closure |
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*/ |
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private function onRejected(RequestInterface $request, array $options) |
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{ |
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return function ($reason) use ($request, $options) { |
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if (!$reason instanceof ClientException) { |
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return new RejectedPromise($reason); |
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} |
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$response = $reason->getResponse(); |
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if ($next = $this->handleUnauthenticatedResponse($request, $response, $options)) { |
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return $next; |
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} |
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return new RejectedPromise($reason); |
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}; |
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} |
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} |
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treehouselabs /
keystone-client
