/**
* Assert that the given response indicates a succeeded WebSocket handshake.
*/
protected function assertHandshakeSucceeded(HttpResponse $response, string $nonce, array $protocols)
{
if ($response->getStatusCode() !== Http::SWITCHING_PROTOCOLS) {
throw new \RuntimeException(\sprintf('Unexpected HTTP response code: %s', $response->getStatusCode()));
}
if (!\in_array('upgrade', $response->getHeaderTokenValues('Connection'), true)) {
throw new \RuntimeException(\sprintf('HTTP connection header did not contain upgrade: "%s"', $response->getHeaderLine('Connection')));
}
if ('websocket' !== \strtolower($response->getHeaderLine('Upgrade'))) {
throw new \RuntimeException(\sprintf('HTTP upgrade header did not specify websocket: "%s"', $response->getHeaderLine('Upgrade')));
}
if (\base64_encode(\sha1($nonce . self::GUID, true)) !== $response->getHeaderLine('Sec-WebSocket-Accept')) {
throw new \RuntimeException('Failed to verify Sec-WebSocket-Accept HTTP header');
}
if ($response->hasHeader('Sec-WebSocket-Protocol')) {
if (!\in_array($response->getHeaderLine('Sec-WebSocket-Protocol'), $protocols, true)) {
throw new \OutOfRangeException(\sprintf('Unsupported protocol: "%s"', $response->getHeaderLine('Sec-WebSocket-Protocol')));
}
}
}
/**
* Serialize HTTP response headers into a string.
*/
protected function serializeHeaders(HttpResponse $response, bool &$close, int $size = null, bool $nobody = false, bool $deferred = false) : string
{
$reason = \trim($response->getReasonPhrase());
if ($reason === '') {
$reason = \trim(Http::getReason($response->getStatusCode()));
}
if (!$response->hasHeader('Connection')) {
$response = $response->withHeader('Connection', $close ? 'close' : 'keep-alive');
}
if (!$close) {
$response = $response->withHeader('Keep-Alive', '30');
}
$buffer = \sprintf("HTTP/%s %u%s\r\n", $response->getProtocolVersion(), $response->getStatusCode(), \rtrim(' ' . $reason));
if (!$nobody) {
if ($deferred) {
$close = true;
} else {
if ((double) $response->getProtocolVersion() > 1) {
if ($size === null) {
$buffer .= "Transfer-Encoding: chunked\r\n";
} else {
$buffer .= "Content-Length: {$size}\r\n";
}
} elseif ($size !== null) {
$buffer .= "Content-Length: {$size}\r\n";
} else {
$close = true;
}
}
}
foreach ($response->getHeaders() as $name => $header) {
$name = Http::normalizeHeaderName($name);
foreach ($header as $value) {
$buffer .= $name . ': ' . $value . "\r\n";
}
}
return $buffer;
}
protected function shouldConnectionBeClosed(HttpResponse $response) : bool
{
if (!$this->keepAlive) {
return true;
}
if ($response->getProtocolVersion() === '1.0' && !\in_array('keep-alive', $response->getHeaderTokenValues('Connection'), true)) {
return true;
}
if (!$response->hasHeader('Content-Length') && 'chunked' !== \strtolower($response->getHeaderLine('Transfer-Encoding'))) {
return true;
}
return false;
}
/**
* Check if the given response payload should be compressed.
*
* @param HttpRequest $request
* @param HttpResponse $response
* @return bool
*/
protected function isCompressable(HttpRequest $request, HttpResponse $response) : bool
{
if ($request->getMethod() === Http::HEAD) {
return false;
}
if ($response->getBody() instanceof DeferredBody || Http::isResponseWithoutBody($response->getStatusCode())) {
return false;
}
if ($response->hasHeader('Content-Encoding') || !$response->hasHeader('Content-Type')) {
return false;
}
try {
$media = $response->getContentType()->getMediaType();
} catch (InvalidMediaTypeException $e) {
return false;
}
if (isset($this->types[(string) $media])) {
return true;
}
foreach ($media->getSubTypes() as $sub) {
if (isset($this->subTypes[$sub])) {
return true;
}
}
return false;
}