/**
* Assert that the given HTTP request can be upgraded to the WebSocket protocol.
*/
protected function assertUpgradePossible(HttpRequest $request)
{
if ($request->getMethod() !== Http::GET) {
throw new StatusException(Http::METHOD_NOT_ALLOWED, 'WebSocket upgrade requires an HTTP GET request', ['Allow' => Http::GET, 'Sec-Websocket-Version' => '13']);
}
if (!$request->hasHeader('Sec-Websocket-Key')) {
throw new StatusException(Http::BAD_REQUEST, 'Missing Sec-Websocket-Key HTTP header', ['Sec-Websocket-Version' => '13']);
}
if (!\in_array('13', $request->getHeaderTokenValues('Sec-Websocket-Version'), true)) {
throw new StatusException(Http::BAD_REQUEST, 'Secure websocket version 13 required', ['Sec-Websocket-Version' => '13']);
}
}
/**
* Invoke HTTP/1 upgrade handlers in an attempt to update the connection based on the outcome of an action.
*
* @param HttpRequest $request
* @param mixed $result
* @return HttpResponse Or null if no connection upgrade is available.
*/
protected function upgradeResult(HttpRequest $request, $result)
{
$protocols = [''];
if (\in_array('upgrade', $request->getHeaderTokenValues('Connection'), true)) {
$protocols = \array_merge($request->getHeaderTokenValues('Upgrade'), $protocols);
}
foreach ($protocols as $protocol) {
foreach ($this->upgradeResultHandlers as $handler) {
if ($handler->isUpgradeSupported($protocol, $request, $result)) {
$response = $handler->createUpgradeResponse($request, $result);
$response = $response->withAttribute(UpgradeResultHandler::class, $handler);
return $response;
}
}
}
return $result;
}
protected function serializeHeaders(HttpRequest $request, int $size = null)
{
if (\in_array('upgrade', $request->getHeaderTokenValues('Connection'))) {
$request = $request->withHeader('Connection', 'upgrade');
} else {
$request = $request->withHeader('Connection', $this->keepAlive ? 'keep-alive' : 'close');
}
$buffer = \sprintf("%s %s HTTP/%s\r\n", $request->getMethod(), $request->getRequestTarget(), $request->getProtocolVersion());
if ($this->keepAlive) {
$buffer .= \sprintf("Keep-Alive: timeout=%u\r\n", $this->pool->getMaxLifetime());
}
if ($size === null) {
$buffer .= "Transfer-Encoding: chunked\r\n";
} else {
$buffer .= "Content-Length: {$size}\r\n";
}
foreach ($request->getHeaders() as $name => $header) {
$name = Http::normalizeHeaderName($name);
foreach ($header as $value) {
$buffer .= $name . ': ' . $value . "\r\n";
}
}
return $buffer;
}
/**
* Get all known hop IP addresses as provided by an HTTP proxy.
*
* @param HttpRequest $request
* @return array
*/
public function getAddresses(HttpRequest $request) : array
{
$addresses = [];
foreach ($this->addressHeaders as $name) {
if ($request->hasHeader($name)) {
foreach ($request->getHeaderTokenValues($name, false) as $ip) {
$addresses[] = $ip;
}
}
}
return $addresses;
}
