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<?php declare(strict_types=1); |
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namespace ncryptf\middleware; |
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use Exception; |
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use ncryptf\Response; |
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use Psr\SimpleCache\CacheInterface; |
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use Psr\Http\Message\StreamInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Server\MiddlewareInterface; |
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use Fig\Http\Message\StatusCodeInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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use Psr\Http\Server\RequestHandlerInterface; |
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use Psr\SimpleCache\InvalidArgumentException; |
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use ncryptf\middleware\EncryptionKeyInterface; |
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final class RequestParser implements MiddlewareInterface |
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{ |
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/** |
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* @var array $contentType |
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*/ |
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protected $contentType = [ |
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'application/vnd.25519+json', |
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'application/vnd.ncryptf+json' |
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]; |
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/** |
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* Constructor |
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* @param CacheInterface $cache A PSR-16 CacheInterface |
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*/ |
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public function __construct(CacheInterface $cache) |
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{ |
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$this->cache = $cache; |
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} |
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/** |
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* Processes the request |
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* @param ServerRequestInterface $request |
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* @param RequestHandlerInterface $handler |
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*/ |
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public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface |
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{ |
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if ($this->checkRequest($request)) { |
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try { |
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$rawBody = \base64_decode($request->getBody()->getContents()); |
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if ($rawBody === '') { |
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$request = $request->withParsedBody([]); |
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$request->withAttribute('ncryptf-decrypted-body', ''); |
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} else { |
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$version = Response::getVersion($rawBody); |
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$key = $this->getEncryptionKey($request); |
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$body = $this->decryptRequest($key, $request, $rawBody, $version); |
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$request = $request->withParsedBody(\json_decode($body, true, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_PRESERVE_ZERO_FRACTION)) |
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->withAttribute('ncryptf-decrypted-body', $body) |
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->withAttribute('ncryptf-version', $version) |
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->withAttribute('ncryptf-request-public-key', $version === 2 ? Response::getPublicKeyFromResponse($rawBody) : $request->getHeaderLine('x-pubkey')); |
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} |
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} catch (DecryptionFailedException | InvalidArgumentException | InvalidSignatureException | InvalidChecksumException | Exception $e) { |
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return $handler->handle($request) |
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->withStatus(401); |
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} |
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} |
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return $handler->handle($request); |
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} |
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/** |
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* Decrypts a request |
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* @param EncryptionKeyInterface $key |
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* @param ServerRequestInterface $request |
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* @param string $rawBody |
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* @param int $version |
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* @return string|null |
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*/ |
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private function decryptRequest(EncryptionKeyInterface $key, ServerRequestInterface $request, string $rawBody, int $version) :? string |
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{ |
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static $response = null; |
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static $nonce = null; |
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static $publicKey = null; |
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$response = new Response( |
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$key->getBoxSecretKey() |
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); |
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if ($version === 1) { |
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if (!$request->hasHeader('x-pubkey') || !$request->hasHeader('x-nonce')) { |
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throw new Exception('Missing nonce or public key header. Unable to decrypt response.'); |
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} |
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$publicKey = \base64_decode($request->getHeaderLine('x-pubkey')); |
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$nonce = \base64_decode($request->getHeaderLine('x-nonce')); |
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} |
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$decryptedRequest = $response->decrypt( |
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$rawBody, |
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$publicKey, |
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$nonce |
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); |
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$hashKey = $request->getHeaderLine('x-hashid'); |
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if ($key->isEphemeral()) { |
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$this->cache->delete($hashKey); |
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} |
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return $decryptedRequest; |
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} |
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/** |
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* Determines the key from the X-HashId header |
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* @param ServerRequestInterface |
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* @return EncryptionKeyInterface |
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*/ |
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private function getEncryptionKey(ServerRequestInterface $request) : EncryptionKeyInterface |
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{ |
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if (!$request->hasHeader('x-hashid')) { |
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throw new Exception('Unable to decrypt request.'); |
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} |
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$hashKey = $request->getHeaderLine('x-hashid'); |
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try { |
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return $this->cache->get($hashKey); |
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} catch (InvalidArgumentException $e) { |
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throw new Exception('Unable to decrypt request.', null, $e); |
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} |
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} |
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/** |
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* Check whether the request payload need to be processed |
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*/ |
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private function checkRequest(ServerRequestInterface $request): bool |
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{ |
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$contentType = $request->getHeaderLine('Content-Type'); |
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foreach ($this->contentType as $allowedType) { |
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if (stripos($contentType, $allowedType) === 0) { |
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return true; |
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} |
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} |
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return false; |
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} |
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} |
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ncryptf /
ncryptf-php
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