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