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<?php
namespace Ratchet\RFC6455\Handshake;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
class ResponseVerifier {
public function verifyAll(RequestInterface $request, ResponseInterface $response) {
$passes = 0;
$passes += (int)$this->verifyStatus($response->getStatusCode());
$passes += (int)$this->verifyUpgrade($response->getHeader('Upgrade'));
$passes += (int)$this->verifyConnection($response->getHeader('Connection'));
$passes += (int)$this->verifySecWebSocketAccept(
$response->getHeader('Sec-WebSocket-Accept')
, $request->getHeader('Sec-WebSocket-Key')
);
$passes += (int)$this->verifySubProtocol(
$request->getHeader('Sec-WebSocket-Protocol')
, $response->getHeader('Sec-WebSocket-Protocol')
);
$passes += (int)$this->verifyExtensions(
$request->getHeader('Sec-WebSocket-Extensions')
, $response->getHeader('Sec-WebSocket-Extensions')
);
return (6 === $passes);
}
public function verifyStatus($status) {
return ((int)$status === 101);
}
public function verifyUpgrade(array $upgrade) {
return (in_array('websocket', array_map('strtolower', $upgrade)));
}
public function verifyConnection(array $connection) {
return (in_array('upgrade', array_map('strtolower', $connection)));
}
public function verifySecWebSocketAccept($swa, $key) {
return (
1 === count($swa) &&
1 === count($key) &&
$swa[0] === $this->sign($key[0])
);
}
public function sign($key) {
return base64_encode(sha1($key . NegotiatorInterface::GUID, true));
}
public function verifySubProtocol(array $requestHeader, array $responseHeader) {
if (0 === count($responseHeader)) {
return true;
}
$requestedProtocols = array_map('trim', explode(',', implode(',', $requestHeader)));
return count($responseHeader) === 1 && count(array_intersect($responseHeader, $requestedProtocols)) === 1;
}
public function verifyExtensions(array $requestHeader, array $responseHeader) {
if (in_array('permessage-deflate', $responseHeader)) {
return strpos(implode(',', $requestHeader), 'permessage-deflate') !== false ? 1 : 0;
}
return 1;
}
}