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<?php
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/**
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* This file is a part of Woketo package.
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*
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* (c) Nekland <[email protected]>
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*
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* For the full license, take a look to the LICENSE file
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* on the root directory of this project
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*/
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namespace Nekland\Woketo\Rfc6455\Handshake;
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use Nekland\Woketo\Exception\RuntimeException;
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use Nekland\Woketo\Exception\UnsupportedException;
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use Nekland\Woketo\Exception\WebsocketException;
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use Nekland\Woketo\Http\AbstractHttpMessage;
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use Nekland\Woketo\Http\Request;
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use Nekland\Woketo\Http\Response;
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use Nekland\Woketo\Http\Url;
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class ClientHandshake implements HandshakeInterface
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{
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const WEBSOCKET_VERSION = 13;
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/**
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* {@inheritdoc}
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*/
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public function sign(AbstractHttpMessage $request, string $key = null)
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{
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if (!$request instanceof Request) {
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throw new RuntimeException(sprintf('Expected request at first argument but got %s', gettype($request)));
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}
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$key = '';
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for ($i = 0; $i < 16; $i++) {
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$key .= chr(mt_rand(0,255));
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}
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$key = base64_encode($key);
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$request->setKey($key);
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return $key;
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}
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/**
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* {@inheritdoc}
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*
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* Learn more here: https://tools.ietf.org/html/rfc6455#section-4.1
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*/
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public function verify(AbstractHttpMessage $response, string $key = null)
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{
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if (!$response instanceof Response) {
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throw new RuntimeException(
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sprintf('The client handshake cannot verify something else than a Response object, %s given.', get_class($response))
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);
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}
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// If the http code is not 101 there's a problem.
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if ($response->getStatusCode() !== 101) {
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if ($response->getStatusCode() === 401) {
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throw new UnsupportedException(
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'This WebSocket server needs an HTTP authentication but Woketo doesn\'t supports it for now.'
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);
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}
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throw new WebsocketException(
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sprintf('Attempting to get a 101 response from the server but got %s.', $response->getStatusCode())
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);
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}
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$remoteSignature = $response->getHeader('Sec-WebSocket-Accept');
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if (
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\strtolower($response->getHeader('Upgrade')) !== 'websocket'
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|| \strtolower($response->getHeader('Connection')) !== 'upgrade'
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|| empty($remoteSignature)
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) {
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throw new WebsocketException('The server doesn\'t answer properly to the handshake.');
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}
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$signature = \base64_encode(\sha1($key . HandshakeInterface::GUID, true));
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if ($remoteSignature !== $signature) {
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throw new WebsocketException('The remote signature is invalid.');
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}
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if (!empty($response->getHeader('Sec-WebSocket-Protocol', null))) {
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throw new WebsocketException('The server specified a WebSocket subprotocol but none is supported by Woketo.');
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}
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return true;
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}
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/**
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* @param Url $url
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* @return Request
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*/
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public function getRequest(Url $url)
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{
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$request = Request::createClientRequest($url->getUri(), $url->getHost(), $url->getPort());
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$request->setVersion(ClientHandshake::WEBSOCKET_VERSION);
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$request->setKey(base64_encode(ClientHandshake::generateRandom16BytesKey()));
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return $request;
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}
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/**
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* @return string
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*/
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public static function generateRandom16BytesKey()
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{
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$bytes = '';
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for($i = 0; $i < 16; $i++) {
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$bytes .= chr(mt_rand(0, 255));
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}
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return $bytes;
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}
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}
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Nekland /
Woketo
