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<?php |
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/** |
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* (c) Kitodo. Key to digital objects e.V. <[email protected]> |
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* |
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* This file is part of the Kitodo and TYPO3 projects. |
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* |
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* @license GNU General Public License version 3 or later. |
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* For the full copyright and license information, please read the |
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* LICENSE.txt file that was distributed with this source code. |
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*/ |
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namespace Kitodo\Dlf\Plugin\Eid; |
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use Kitodo\Dlf\Common\StdOutStream; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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use TYPO3\CMS\Core\Configuration\ExtensionConfiguration; |
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use TYPO3\CMS\Core\Http\JsonResponse; |
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use TYPO3\CMS\Core\Http\RequestFactory; |
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use TYPO3\CMS\Core\Http\Response; |
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use TYPO3\CMS\Core\Utility\GeneralUtility; |
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use TYPO3\CMS\Core\Utility\MathUtility; |
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/** |
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* eID image proxy for plugin 'Page View' of the 'dlf' extension |
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* |
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* Supported query parameters: |
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* - `url` (mandatory): The URL to be proxied |
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* - `header` (optional) |
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* - `1`: Request headers and body (via GET) |
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* - `2`: Request only headers (via HEAD) and dump them to response body |
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* |
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* @author Alexander Bigga <[email protected]> |
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* @package TYPO3 |
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* @subpackage dlf |
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* @access public |
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*/ |
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class PageViewProxy |
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{ |
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/** |
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* @var RequestFactory |
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*/ |
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protected $requestFactory; |
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/** |
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* @var mixed |
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*/ |
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protected $extConf; |
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public function __construct() |
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{ |
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$this->requestFactory = GeneralUtility::makeInstance(RequestFactory::class); |
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$this->extConf = GeneralUtility::makeInstance(ExtensionConfiguration::class)->get('dlf'); |
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} |
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/** |
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* Get headers to be sent to the proxied target. |
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* |
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* @return array |
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*/ |
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protected function getRequestHeaders(): array |
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{ |
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return [ |
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'User-Agent' => $this->extConf['useragent'] ?? 'Kitodo.Presentation Proxy', |
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]; |
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} |
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/** |
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* Return a response that is derived from $response and contains CORS |
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* headers to be sent to the client. |
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* |
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* @return ResponseInterface $response |
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* @return ServerRequestInterface $request The incoming request. |
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* @return ResponseInterface |
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*/ |
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protected function withCorsResponseHeaders( |
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ResponseInterface $response, |
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ServerRequestInterface $request |
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): ResponseInterface { |
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$origin = (string) ($request->getHeaderLine('Origin') ?: '*'); |
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return $response |
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->withHeader('Access-Control-Allow-Methods', 'GET, OPTIONS') |
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->withHeader('Access-Control-Allow-Origin', $origin) |
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->withHeader('Access-Control-Max-Age', '86400'); |
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} |
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/** |
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* Takes headers listed in $headerNames from $fromResponse, adds them to |
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* $toResponse and returns the result. |
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* |
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* @param ResponseInterface $fromResponse |
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* @param ResponseInterface $toResponse |
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* @param array $headerNames |
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* @return ResponseInterface |
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*/ |
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protected function copyHeaders( |
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ResponseInterface $fromResponse, |
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ResponseInterface $toResponse, |
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array $headerNames |
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) { |
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$result = $toResponse; |
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foreach ($headerNames as $headerName) { |
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$headerValues = $fromResponse->getHeader($headerName); |
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$result = $result->withAddedHeader($headerName, $headerValues); |
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} |
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return $result; |
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} |
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/** |
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* Handle an OPTIONS request. |
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* |
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* @param ServerRequestInterface $request |
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* @return ResponseInterface |
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*/ |
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protected function handleOptions(ServerRequestInterface $request): ResponseInterface |
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{ |
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// 204 No Content |
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$response = GeneralUtility::makeInstance(Response::class) |
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->withStatus(204); |
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return $this->withCorsResponseHeaders($response, $request); |
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} |
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/** |
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* Handle a GET request. |
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* |
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* @param ServerRequestInterface $request |
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* @return ResponseInterface |
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*/ |
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protected function handleGet(ServerRequestInterface $request): ResponseInterface |
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{ |
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$queryParams = $request->getQueryParams(); |
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$url = (string) ($queryParams['url'] ?? ''); |
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if (!GeneralUtility::isValidUrl($url)) { |
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return new JsonResponse(['message' => 'Did not receive a valid URL.'], 400); |
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} |
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// This has previously been used as parameter for `GeneralUtility::getUrl()` |
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// A value of 0 would indicate not to fetch headers, which we'll ignore. |
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$header = (int) ($queryParams['header'] ?? 1); |
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$headerOnly = MathUtility::forceIntegerInRange($header, 0, 2, 0) === 2; |
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try { |
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return $headerOnly |
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? $this->handleHeaderRequest($url, $request) |
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: $this->handleProxyRequest($url, $request); |
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} catch (\Exception $e) { |
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return new JsonResponse(['message' => 'Could not fetch resource of given URL.'], 500); |
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} |
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} |
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/** |
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* Handle a request to proxy the target resource. |
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* |
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* @param string $url |
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* @param ServerRequestInterface $request |
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* @return ResponseInterface |
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*/ |
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protected function handleProxyRequest( |
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string $url, |
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ServerRequestInterface $request |
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): ResponseInterface { |
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$targetResponse = $this->requestFactory->request($url, 'GET', [ |
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'headers' => $this->getRequestHeaders(), |
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// For performance, don't download content up-front. Rather, we'll |
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// download and upload simultaneously. |
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// https://docs.guzzlephp.org/en/6.5/request-options.html#stream |
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'stream' => true, |
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// Don't throw exceptions when a non-success status code is |
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// received. We handle these manually. |
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'http_errors' => false, |
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]); |
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$body = new StdOutStream($targetResponse->getBody()); |
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$clientResponse = GeneralUtility::makeInstance(Response::class) |
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->withStatus($targetResponse->getStatusCode()) |
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->withBody($body); |
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$clientResponse = $this->copyHeaders($targetResponse, $clientResponse, [ |
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'Content-Length', |
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'Content-Type', |
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'Last-Modified', |
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]); |
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return $this->withCorsResponseHeaders($clientResponse, $request); |
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} |
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/** |
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* Handle a request to forward headers from target. |
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* |
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* @param string $url |
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* @param ServerRequestInterface $request |
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* @return ResponseInterface |
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*/ |
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protected function handleHeaderRequest( |
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string $url, |
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ServerRequestInterface $request |
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): ResponseInterface { |
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$targetResponse = $this->requestFactory->request($url, 'HEAD', [ |
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'headers' => $this->getRequestHeaders(), |
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]); |
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$clientResponse = GeneralUtility::makeInstance(Response::class) |
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->withStatus(200); |
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$body = $clientResponse->getBody(); |
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foreach ($targetResponse->getHeaders() as $name => $values) { |
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$body->write($name . ': ' . implode(', ', $values) . "\n"); |
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} |
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return $this->withCorsResponseHeaders($clientResponse, $request); |
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} |
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/** |
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* The main method of the eID script |
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* |
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* @access public |
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* |
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* @param ServerRequestInterface $request |
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* @return ResponseInterface |
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*/ |
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public function main(ServerRequestInterface $request) |
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{ |
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switch ($request->getMethod()) { |
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case 'OPTIONS': |
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return $this->handleOptions($request); |
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case 'GET': |
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return $this->handleGet($request); |
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default: |
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// 405 Method Not Allowed |
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return GeneralUtility::makeInstance(Response::class) |
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->withStatus(405); |
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} |
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} |
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} |
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kitodo /
kitodo-presentation
