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<?php declare(strict_types = 1); |
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namespace Wolnosciowiec\WebProxy\Controllers; |
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use GuzzleHttp\Exception\ConnectException; |
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use GuzzleHttp\Exception\RequestException; |
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use GuzzleHttp\Exception\ServerException; |
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use function GuzzleHttp\json_encode; |
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use GuzzleHttp\Psr7\Response; |
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use Psr\Log\LoggerInterface; |
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use Wolnosciowiec\WebProxy\Factory\ProxyClientFactory; |
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use Wolnosciowiec\WebProxy\Factory\RequestFactory; |
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/** |
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* @package Wolnosciowiec\WebProxy\Controllers |
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*/ |
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class PassThroughController |
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{ |
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/** |
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* @var int $retries |
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*/ |
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private $retries = 0; |
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/** |
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* @var int $maxRetries |
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*/ |
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private $maxRetries = 3; |
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/** |
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* @var ProxyClientFactory $clientFactory |
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*/ |
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private $clientFactory; |
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/** |
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* @var RequestFactory $requestFactory |
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*/ |
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private $requestFactory; |
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/** |
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* @var LoggerInterface $logger |
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*/ |
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private $logger; |
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public function __construct( |
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int $maxRetries = 3, |
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ProxyClientFactory $clientFactory, |
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RequestFactory $requestFactory, |
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LoggerInterface $logger |
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) { |
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$this->requestFactory = $requestFactory; |
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$this->maxRetries = $maxRetries; |
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$this->clientFactory = $clientFactory; |
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$this->logger = $logger; |
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} |
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/** |
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* @throws \Exception |
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* @return string |
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*/ |
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private function getRequestedURL() |
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{ |
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if (!isset($_SERVER['HTTP_WW_TARGET_URL'])) { |
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throw new \Exception('Request URL not specified. Should be in a header "WW_TARGET_URL"'); |
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} |
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return $_SERVER['HTTP_WW_TARGET_URL']; |
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} |
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/** |
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* @throws \Exception |
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* @return \GuzzleHttp\Psr7\ServerRequest |
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*/ |
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private function getRequest() |
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{ |
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return $this->requestFactory->create($this->getRequestedURL()); |
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} |
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/** |
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* @throws \Exception |
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* @return Response |
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*/ |
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public function executeAction(): Response |
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{ |
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try { |
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$request = $this->getRequest(); |
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} catch (\Exception $e) { |
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$this->logger->error('Invalid request: ' . $e->getMessage()); |
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return new Response(400, [], json_encode([ |
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'success' => false, |
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'message' => $e->getMessage(), |
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])); |
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} |
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try { |
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$this->logger->notice('Forwarding to "' . $this->getRequestedURL() . '"'); |
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// forward the request and get the response. |
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$response = $this->clientFactory->create() |
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->forward($request) |
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->to($this->getRequestedURL()); |
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} catch (RequestException $e) { |
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// try again in case of connection failure |
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if (($e instanceof ConnectException || $e instanceof ServerException) |
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&& $this->maxRetries > $this->retries |
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) { |
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$this->retries++; |
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$this->logger->error('Retrying request(' . $this->retries . '/' . $this->maxRetries . ')'); |
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return $this->executeAction(); |
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} |
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$response = $e->getResponse(); |
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if (!$response instanceof Response) { |
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$response = new Response(500, [], $e->getMessage()); |
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$this->logger->notice('Error response: ' . $e->getMessage()); |
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} |
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} |
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return $this->fixResponseHeaders($response); |
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} |
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private function fixResponseHeaders(Response $response) |
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{ |
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// fix: empty response if page is using gzip (Zend Diactoros is trying to do the same, but it's doing it incorrectly) |
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if (!$response->hasHeader('Content-Length')) { |
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$response = $response->withAddedHeader('Content-Length', strlen((string)$response->getBody())); |
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} |
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// we are not using any encoding at the output |
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$response = $response->withoutHeader('Transfer-Encoding'); |
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return $response; |
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} |
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/** |
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* @codeCoverageIgnore |
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* @param string $code |
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* @throws \InvalidArgumentException |
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*/ |
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public function sendResponseCode($code) |
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{ |
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if (defined('IS_EMULATED_ENVIRONMENT') && IS_EMULATED_ENVIRONMENT) { |
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return; |
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} |
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if ($code === 404) { |
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header('HTTP/1.0 404 Not Found'); |
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return; |
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} |
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elseif ($code === 403) { |
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header('HTTP 1.1 403 Unauthorized'); |
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return; |
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} |
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elseif ($code === 400) { |
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header('HTTP/1.0 400 Bad Request'); |
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return; |
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} |
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throw new \InvalidArgumentException('Unrecognized code passed'); |
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} |
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} |
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Wolnosciowiec /
webproxy
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