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<?php
/**
* Websocket stream wrapper.
*
* This file is part of MadelineProto.
* MadelineProto is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
* MadelineProto is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Affero General Public License for more details.
* You should have received a copy of the GNU General Public License along with MadelineProto.
* If not, see <http://www.gnu.org/licenses/>.
*
* @author Daniil Gentili <daniil@daniil.it>
* @copyright 2016-2019 Daniil Gentili <daniil@daniil.it>
* @license https://opensource.org/licenses/AGPL-3.0 AGPLv3
*
* @link https://docs.madelineproto.xyz MadelineProto documentation
*/
namespace danog\MadelineProto\Stream\Transport;
use Amp\Http\Rfc7230;
use Amp\Http\Status;
use Amp\Promise;
use Amp\Socket\ConnectException;
use Amp\Websocket\Client\ConnectionException;
use Amp\Websocket\Client\Handshake;
use Amp\Websocket\Client\Internal\ClientSocket;
use Amp\Websocket\Client\Rfc6455Connection;
use Amp\Websocket\Rfc6455Client;
use Amp\Websocket\Rfc7692CompressionFactory;
use danog\MadelineProto\Stream\Async\RawStream;
use danog\MadelineProto\Stream\ConnectionContext;
use danog\MadelineProto\Stream\RawStreamInterface;
use function Amp\Websocket\generateKey;
use function Amp\Websocket\validateAcceptForKey;
/**
* Websocket stream wrapper.
*
* @author Daniil Gentili <daniil@daniil.it>
*/
class WsStream implements RawStreamInterface
{
use RawStream;
/**
* Websocket stream.
*
* @var Rfc6455Connection
*/
private $stream;
/**
* Websocket message.
*
* @var Message
*/
private $message;
/**
* Connect to stream.
*
* @param ConnectionContext $ctx The connection context
*
* @return \Generator
*/
public function connectAsync(ConnectionContext $ctx, string $header = ''): \Generator
{
$this->dc = $ctx->getIntDc();
$stream = yield $ctx->getStream();
$resource = $stream->getStream()->getResource();
$this->compressionFactory = new Rfc7692CompressionFactory();
$handshake = new Handshake(\str_replace('tcp://', $ctx->isSecure() ? 'ws://' : 'wss://', $ctx->getStringUri()));
$key = generateKey();
yield $stream->write($this->generateRequest($handshake, $key));
$buffer = '';
while (($chunk = yield $stream->read()) !== null) {
$buffer .= $chunk;
if ($position = \strpos($buffer, "\r\n\r\n")) {
$headerBuffer = \substr($buffer, 0, $position + 4);
$buffer = \substr($buffer, $position + 4);
$headers = $this->handleResponse($headerBuffer, $key);
$client = new Rfc6455Client(
new ClientSocket($resource, $buffer),
$handshake->getOptions(),
true
);
$this->stream = new Rfc6455Connection($client, $headers);
//$this->stream = new Rfc6455Connection($this->stream, $headers, $buffer);
break;
}
}
if (!$this->stream) {
throw new ConnectionException('Failed to read response from server');
}
yield $this->write($header);
}
/**
* Async close.
*/
public function disconnect()
{
try {
$this->stream->close();
} catch (Exception $e) {
}
}
public function readAsync(): \Generator
{
try {
if (!$this->message || ($data = yield $this->message->buffer()) === null) {
$this->message = yield $this->stream->receive();
if (!$this->message) {
return null;
}
$data = yield $this->message->buffer();
$this->message = null;
}
} catch (Exception $e) {
if ($e->getReason() !== 'Client closed the underlying TCP connection') {
throw $e;
}
return null;
}
return $data;
}
/**
* Async write.
*
* @param string $data Data to write
*
* @return Promise
*/
public function write(string $data): \Amp\Promise
{
return $this->stream->sendBinary($data);
}
private function generateRequest(Handshake $handshake, string $key): string
{
$uri = $handshake->getUri();
$headers = $handshake->getHeaders();
$headers['host'] = [$uri->getAuthority()];
$headers['connection'] = ['Upgrade'];
$headers['upgrade'] = ['websocket'];
$headers['sec-websocket-version'] = ['13'];
$headers['sec-websocket-key'] = [$key];
if ($handshake->getOptions()->isCompressionEnabled()) {
$headers['sec-websocket-extensions'] = [$this->compressionFactory->createRequestHeader()];
}
if (($path = $uri->getPath()) === '') {
$path = '/';
}
if (($query = $uri->getQuery()) !== '') {
$path .= '?'.$query;
}
return \sprintf("GET %s HTTP/1.1\r\n%s\r\n", $path, Rfc7230::formatHeaders($headers));
}
private function handleResponse(string $headerBuffer, string $key): array
{
if (\substr($headerBuffer, -4) !== "\r\n\r\n") {
throw new ConnectException('Invalid header provided');
}
$position = \strpos($headerBuffer, "\r\n");
$startLine = \substr($headerBuffer, 0, $position);
if (!\preg_match("/^HTTP\/(1\.[01]) (\d{3}) ([^\x01-\x08\x10-\x19]*)$/i", $startLine, $matches)) {
throw new ConnectException('Invalid response start line: '.$startLine);
}
$version = $matches[1];
$status = (int) $matches[2];
$reason = $matches[3];
if ($version !== '1.1' || $status !== Status::SWITCHING_PROTOCOLS) {
throw new ConnectionException(
\sprintf('Did not receive switching protocols response: %d %s on DC %d', $status, $reason, $this->dc),
$status
);
}
$headerBuffer = \substr($headerBuffer, $position + 2, -2);
$headers = Rfc7230::parseHeaders($headerBuffer);
$upgrade = $headers['upgrade'][0] ?? '';
if (\strtolower($upgrade) !== 'websocket') {
throw new ConnectionException('Missing "Upgrade: websocket" header');
}
$connection = $headers['connection'][0] ?? '';
if (!\in_array('upgrade', \array_map('trim', \array_map('strtolower', \explode(',', $connection))), true)) {
throw new ConnectionException('Missing "Connection: upgrade" header');
}
$secWebsocketAccept = $headers['sec-websocket-accept'][0] ?? '';
if (!validateAcceptForKey($secWebsocketAccept, $key)) {
throw new ConnectionException('Invalid "Sec-WebSocket-Accept" header');
}
return $headers;
}
final protected function createCompressionContext(array $headers): ?Websocket\CompressionContext
{
$extensions = $headers['sec-websocket-extensions'][0] ?? '';
$extensions = \array_map('trim', \explode(',', $extensions));
foreach ($extensions as $extension) {
if ($compressionContext = $this->compressionFactory->fromServerHeader($extension)) {
return $compressionContext;
}
}
return null;
}
/**
* {@inheritdoc}
*
* @return \Amp\Socket\Socket
*/
public function getSocket(): \Amp\Socket\Socket
{
return $this->stream->getSocket();
}
public static function getName(): string
{
return __CLASS__;
}
}
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