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<?php
/**
* Copyright (C) 2014-2020 Textalk/Abicart and contributors.
*
* This file is part of Websocket PHP and is free software under the ISC License.
* License text: https://raw.githubusercontent.com/Textalk/websocket-php/master/COPYING
*/
namespace WebSocket;
class Server extends Base
{
// Default options
protected static $default_options = [
'filter' => ['text', 'binary'],
'fragment_size' => 4096,
'logger' => null,
'port' => 8000,
'return_obj' => false,
'timeout' => null,
];
protected $addr;
protected $port;
protected $listening;
protected $request;
protected $request_path;
/**
* @param array $options
* Associative array containing:
* - timeout: Set the socket timeout in seconds.
* - fragment_size: Set framgemnt size. Default: 4096
* - port: Chose port for listening. Default 8000.
*/
public function __construct(array $options = [])
{
$this->options = array_merge(self::$default_options, $options);
$this->port = $this->options['port'];
$this->setLogger($this->options['logger']);
$error = $errno = $errstr = null;
set_error_handler(function (int $severity, string $message, string $file, int $line) use (&$error) {
$this->logger->warning($message, ['severity' => $severity]);
$error = $message;
}, E_ALL);
do {
$this->listening = stream_socket_server("tcp://0.0.0.0:$this->port", $errno, $errstr);
} while ($this->listening === false && $this->port++ < 10000);
restore_error_handler();
if (!$this->listening) {
$error = "Could not open listening socket: {$errstr} ({$errno}) {$error}";
$this->logger->error($error);
throw new ConnectionException($error, (int)$errno);
}
$this->logger->info("Server listening to port {$this->port}");
}
public function __destruct()
{
if ($this->isConnected()) {
fclose($this->socket);
}
$this->socket = null;
}
public function getPort(): int
{
return $this->port;
}
public function getPath(): string
{
return $this->request_path;
}
public function getRequest(): array
{
return $this->request;
}
public function getHeader($header): ?string
{
foreach ($this->request as $row) {
if (stripos($row, $header) !== false) {
list($headername, $headervalue) = explode(":", $row);
return trim($headervalue);
}
}
return null;
}
public function accept(): bool
{
$this->socket = null;
return (bool)$this->listening;
}
protected function connect(): void
{
$error = null;
set_error_handler(function (int $severity, string $message, string $file, int $line) use (&$error) {
$this->logger->warning($message, ['severity' => $severity]);
$error = $message;
}, E_ALL);
if (isset($this->options['timeout'])) {
$this->socket = stream_socket_accept($this->listening, $this->options['timeout']);
} else {
$this->socket = stream_socket_accept($this->listening);
}
restore_error_handler();
if (!$this->socket) {
$this->throwException("Server failed to connect. {$error}");
}
if (isset($this->options['timeout'])) {
stream_set_timeout($this->socket, $this->options['timeout']);
}
$this->logger->info("Client has connected to port {port}", [
'port' => $this->port,
'pier' => stream_socket_get_name($this->socket, true),
]);
$this->performHandshake();
}
protected function performHandshake(): void
{
$request = '';
do {
$buffer = stream_get_line($this->socket, 1024, "\r\n");
$request .= $buffer . "\n";
$metadata = stream_get_meta_data($this->socket);
} while (!feof($this->socket) && $metadata['unread_bytes'] > 0);
if (!preg_match('/GET (.*) HTTP\//mUi', $request, $matches)) {
$error = "No GET in request: {$request}";
$this->logger->error($error);
throw new ConnectionException($error);
}
$get_uri = trim($matches[1]);
$uri_parts = parse_url($get_uri);
$this->request = explode("\n", $request);
$this->request_path = $uri_parts['path'];
/// @todo Get query and fragment as well.
if (!preg_match('#Sec-WebSocket-Key:\s(.*)$#mUi', $request, $matches)) {
$error = "Client had no Key in upgrade request: {$request}";
$this->logger->error($error);
throw new ConnectionException($error);
}
$key = trim($matches[1]);
/// @todo Validate key length and base 64...
$response_key = base64_encode(pack('H*', sha1($key . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11')));
$header = "HTTP/1.1 101 Switching Protocols\r\n"
. "Upgrade: websocket\r\n"
. "Connection: Upgrade\r\n"
. "Sec-WebSocket-Accept: $response_key\r\n"
. "\r\n";
$this->write($header);
$this->logger->debug("Handshake on {$get_uri}");
}
}
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