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<?php declare(strict_types=1); |
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namespace ncryptf\middleware; |
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use DateTime; |
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use Exception; |
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use ncryptf\Authorization; |
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use ncryptf\Token; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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use Psr\Http\Server\MiddlewareInterface; |
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use Psr\Http\Server\RequestHandlerInterface; |
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/** |
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* PSR-15 Authentication middleware for handling ncryptf Authorization requests |
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* Abstract class should be extended and implement `getTokenFromAccessToken` and `getRequestBody` |
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*/ |
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abstract class AbstractAuthentication implements MiddlewareInterface |
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{ |
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use \Middlewares\Utils\Traits\HasResponseFactory; |
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// The date header |
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const DATE_HEADER = 'X-DATE'; |
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// The authorization header |
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const AUTHORIZATION_HEADER = 'Authorization'; |
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// The amount of the seconds the request is permitted to differ from the server time |
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const DRIFT_TIME_ALLOWANCE = 90; |
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/** |
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* Process a request |
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* @param ServerRequestInterface $request |
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* @param RequestHandlerInterface $handler |
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* @return ResponseInterface |
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*/ |
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public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface |
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{ |
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$params = Authorization::extractParamsFromHeaderString( |
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$request->getHeaderLine(self::AUTHORIZATION_HEADER) |
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); |
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if ($params) { |
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if ($token = $this->getTokenFromAccessToken($params['access_token'])) { |
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try { |
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$date = new DateTime($params['date'] ?? $request->getHeaderLine(self::DATE_HEADER)); |
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$auth = new Authorization( |
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$request->getMethod(), |
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$this->getRequestUri($request), |
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$token, |
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$date, |
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$this->getRequestBody($request), |
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$params['v'], |
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\base64_decode($params['salt']) |
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); |
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if ($auth->verify(\base64_decode($params['hmac']), $auth, static::DRIFT_TIME_ALLOWANCE)) { |
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return $handler->handle($request->withAttribute('ncryptf-token', $token)); |
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} |
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} catch (Exception $e) { |
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throw $e; |
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} |
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} |
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} |
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return $this->createResponse(401); |
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} |
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private function getRequestUri(ServerRequestInterface $request) : string |
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{ |
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$uri = $request->getUri()->getPath(); |
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$query = $request->getUri()->getQuery(); |
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if (!empty($query)) { |
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return $uri . '?' . \urldecode($query); |
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} |
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return $uri; |
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} |
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/** |
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* Returns the \ncryptf\Token associated to the given access token. |
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* If the access token is not found, `NULL` should be returned |
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* |
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* @param string $accessToken |
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* @return \ncryptf\Token |
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*/ |
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abstract protected function getTokenFromAccessToken(string $accessToken) :? Token; |
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/** |
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* Returns the plaintext request body. If the request is encrypted with vnd.ncryptf+<type> |
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* It should return the decrypted plaintext. |
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* |
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* If the request body is empty, an empty string `""` should be returned. |
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* |
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* @param ServerRequestInterface $request |
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* @return string |
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*/ |
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abstract protected function getRequestBody(ServerRequestInterface $request) : string; |
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} |
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ncryptf /
ncryptf-php
