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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 Psr\Http\Message\MessageInterface; |
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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\Message\StreamInterface; |
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use Psr\Http\Server\MiddlewareInterface; |
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use Psr\Http\Server\RequestHandlerInterface; |
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use Psr\SimpleCache\CacheInterface; |
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use Psr\SimpleCache\InvalidArgumentException; |
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use ncryptf\Request; |
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use ncryptf\middleware\EncryptionKeyInterface; |
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final class JsonResponseFormatter implements MiddlewareInterface |
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{ |
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const ENCODING_OPTIONS = JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_PRESERVE_ZERO_FRACTION; |
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/** |
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* @var EncryptionKeyInterface $key |
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*/ |
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protected $key; |
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/** |
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* @var CacheInterface $cache |
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*/ |
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protected $cache; |
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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 |
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* @param EncryptionKeyInterface $class |
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*/ |
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public function __construct(CacheInterface $cache, string $class) |
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{ |
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$this->cache = $cache; |
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$interface = new $class; |
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if (!($interface instanceof EncryptionKeyInterface)) { |
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throw new Exception('The class name provided is not an instance of EncryptionKeyInterface'); |
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} |
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$this->key = $interface; |
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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($request)) { |
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$response = $handler->handle($request); |
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$version = $request->getAttribute('ncryptf-version'); |
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$publicKey = $request->getAttribute('ncryptf-request-public-key'); |
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$token = $request->getAttribute('ncryptf-token'); |
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if ($version === null || $publicKey === null) { |
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return $response->withStatus(400, 'Unable to encrypt request.'); |
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} |
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$stream = $response->getBody(); |
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$class = $this->key; |
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$key = $class::generate(); |
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$this->cache->set( |
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$key->getHashIdentifier(), |
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\function_exists('igbinary_serialize') ? \igbinary_serialize($key) : \serialize($key) |
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); |
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$r = new Request( |
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$key->getBoxSecretKey(), |
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$token === null ? $key->getSignSecretKey() : $token->signature |
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); |
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$content = $r->encrypt( |
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(string)$stream, |
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$publicKey, |
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$version, |
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$version === 2 ? null : \random_bytes(SODIUM_CRYPTO_BOX_NONCEBYTES) |
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); |
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if ($version === 1) { |
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$response = $response->withHeader('x-sigpubkey', \base64_encode($token === null ? $key->getSignPublicKey() : $token->getSignaturePublicKey())) |
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->withHeader('x-signature', \base64_encode($r->sign((string)$stream))) |
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->withHeader('x-nonce', \base64_encode($r->getNonce())) |
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->withHeader('x-pubkey', \base64_encode($key->getBoxPublicKey())); |
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} |
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$stream->rewind(); |
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$stream->write(\base64_encode($content)); |
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return $response->withBody($stream) |
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->withHeader('Content-Type', 'application/vnd.ncryptf+json') |
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->withHeader('x-public-key-expiration', $key->getPublicKeyExpiration()) |
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->withHeader('x-hashid', $key->getHashIdentifier()); |
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} |
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return $handler->handle($request) |
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->withHeader('Content-Type', 'application/vnd.ncryptf+json'); |
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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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* @param ServerRequestInterface $request |
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* @return bool |
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*/ |
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private function checkRequest(ServerRequestInterface $request): bool |
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{ |
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$contentType = $request->getHeaderLine('Accept'); |
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foreach ($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
