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<?php |
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namespace BeyondCode\LaravelWebSockets\HttpApi\Controllers; |
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use Exception; |
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use Pusher\Pusher; |
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use Illuminate\Http\Request; |
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use GuzzleHttp\Psr7\Response; |
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use Ratchet\ConnectionInterface; |
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use Illuminate\Http\JsonResponse; |
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use GuzzleHttp\Psr7\ServerRequest; |
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use Illuminate\Support\Collection; |
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use Ratchet\Http\HttpServerInterface; |
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use Psr\Http\Message\RequestInterface; |
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use BeyondCode\LaravelWebSockets\Apps\App; |
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use BeyondCode\LaravelWebSockets\QueryParameters; |
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use Symfony\Component\HttpKernel\Exception\HttpException; |
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use Symfony\Bridge\PsrHttpMessage\Factory\HttpFoundationFactory; |
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use BeyondCode\LaravelWebSockets\WebSockets\Channels\ChannelManager; |
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abstract class Controller implements HttpServerInterface |
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{ |
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/** @var string */ |
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protected $requestBuffer = ''; |
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/** @var RequestInterface */ |
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protected $request; |
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/** @var int */ |
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protected $contentLength; |
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/** @var \BeyondCode\LaravelWebSockets\WebSockets\Channels\ChannelManager */ |
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protected $channelManager; |
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public function __construct(ChannelManager $channelManager) |
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{ |
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$this->channelManager = $channelManager; |
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} |
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public function onOpen(ConnectionInterface $connection, RequestInterface $request = null) |
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{ |
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$this->request = $request; |
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$this->contentLength = $this->findContentLength($request->getHeaders()); |
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$this->requestBuffer = (string)$request->getBody(); |
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$this->checkContentLength($connection); |
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} |
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protected function findContentLength(array $headers): int |
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{ |
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return Collection::make($headers)->first(function ($values, $header) { |
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return strtolower($header) === 'content-length'; |
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}); |
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} |
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public function onMessage(ConnectionInterface $from, $msg) |
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{ |
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$this->requestBuffer .= $msg; |
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$this->checkContentLength(); |
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} |
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protected function checkContentLength(ConnectionInterface $connection) |
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{ |
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if (strlen($this->requestBuffer) === $this->contentLength) { |
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$serverRequest = (new ServerRequest( |
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$this->request->getMethod(), |
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$this->request->getUri(), |
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$this->request->getHeaders(), |
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$this->requestBuffer, |
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$this->request->getProtocolVersion() |
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))->withQueryParams(QueryParameters::create($this->request)->all()); |
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$laravelRequest = Request::createFromBase((new HttpFoundationFactory)->createRequest($serverRequest)); |
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$this |
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->ensureValidAppId($laravelRequest->appId) |
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->ensureValidSignature($laravelRequest); |
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$response = $this($laravelRequest); |
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$connection->send(JsonResponse::create($response)); |
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$connection->close(); |
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} |
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} |
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public function onClose(ConnectionInterface $connection) |
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{ |
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} |
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public function onError(ConnectionInterface $connection, Exception $exception) |
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{ |
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if (! $exception instanceof HttpException) { |
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return; |
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} |
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$response = new Response($exception->getStatusCode(), [ |
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'Content-Type' => 'application/json', |
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], json_encode([ |
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'error' => $exception->getMessage(), |
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])); |
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$connection->send(\GuzzleHttp\Psr7\str($response)); |
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$connection->close(); |
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} |
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public function ensureValidAppId(string $appId) |
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{ |
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if (! App::findById($appId)) { |
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throw new HttpException(401, "Unknown app id `{$appId}` provided."); |
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} |
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return $this; |
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} |
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protected function ensureValidSignature(Request $request) |
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{ |
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/* |
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* The `auth_signature` & `body_md5` parameters are not included when calculating the `auth_signature` value. |
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* |
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* The `appId`, `appKey` & `channelName` parameters are actually route paramaters and are never supplied by the client. |
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*/ |
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$params = array_except($request->query(), ['auth_signature', 'body_md5', 'appId', 'appKey', 'channelName']); |
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if ($request->getContent() !== '') { |
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$params['body_md5'] = md5($request->getContent()); |
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} |
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ksort($params); |
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$signature = "{$request->getMethod()}\n/{$request->path()}\n".Pusher::array_implode('=', '&', $params); |
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$authSignature = hash_hmac('sha256', $signature, App::findById($request->get('appId'))->secret); |
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if ($authSignature !== $request->get('auth_signature')) { |
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throw new HttpException(401, 'Invalid auth signature provided.'); |
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} |
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return $this; |
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} |
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abstract public function __invoke(Request $request); |
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} |
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If a variable is not always an object, we recommend to add an additional type check to ensure your method call is safe: