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<?php |
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namespace Bunq\Middleware; |
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use Bunq\Certificate\Certificate; |
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use GuzzleHttp\Psr7\Request; |
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use Psr\Http\Message\RequestInterface; |
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final class RequestSignatureMiddleware |
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{ |
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const SIGNATURE_ALGORITHM = OPENSSL_ALGO_SHA256; |
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/** |
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* @var Certificate |
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*/ |
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private $privateKey; |
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/** |
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* @param Certificate $privateKey |
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*/ |
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public function __construct(Certificate $privateKey) |
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{ |
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$this->privateKey = $privateKey; |
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} |
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/** |
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* @param RequestInterface $request |
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* @param array $options |
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* |
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* @return Request |
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*/ |
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public function __invoke(RequestInterface $request, array $options = []) |
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{ |
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$signature = $this->createSignature($request); |
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$headers = $request->getHeaders(); |
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ksort($headers); |
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$headers['X-Bunq-Client-Signature'] = base64_encode($signature); |
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return new Request( |
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$request->getMethod(), |
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$request->getUri(), |
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$headers, |
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$request->getBody() |
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); |
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} |
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/** |
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* @param RequestInterface $request |
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* |
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* @return string |
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*/ |
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private function createSignature(RequestInterface $request) |
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{ |
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$headers = $request->getHeaders(); |
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ksort($headers); |
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$signatureData = $request->getMethod() . ' ' . $request->getRequestTarget(); |
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$signatureData .= $this->createSignatureDataFromHeaders($headers); |
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$signatureData .= "\n\n"; |
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$body = (string)$request->getBody(); |
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if (!empty($body)) { |
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$signatureData .= $body; |
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} |
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return $this->sign($signatureData); |
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} |
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/** |
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* @param array $headers |
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* |
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* @return string |
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*/ |
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private function createSignatureDataFromHeaders(array $headers) |
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{ |
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$signatureData = ''; |
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foreach ($headers as $header => $values) { |
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foreach ($values as $value) { |
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if ($header === 'User-Agent' |
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|| $header === 'Cache-Control' |
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|| substr($header, 0, 7) === 'X-Bunq-' |
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) { |
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$signatureData .= PHP_EOL . $header . ': ' . $value; |
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} |
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} |
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} |
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return $signatureData; |
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} |
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/** |
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* @param string $data |
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* |
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* @return string |
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* @throws \Exception |
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*/ |
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private function sign($data) |
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{ |
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if (openssl_sign((string)$data, $signature, $this->privateKey->toString(), static::SIGNATURE_ALGORITHM) !== true) { |
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throw new \Exception("Could not sign request: " . openssl_error_string()); |
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} |
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return $signature; |
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} |
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} |
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verschoof /
bunq-api
