@Override
public void handle(ServerHttpRequest request, ServerHttpResponse response)
throws IOException {
if (HttpMethod.GET.equals(request.getMethod())) {
response
.getHeaders()
.setContentType(new MediaType("application", "json", Charset.forName("UTF-8")));
addCorsHeaders(request, response);
addNoCacheHeaders(response);
String content =
String.format(
INFO_CONTENT,
random.nextInt(),
isJsessionIdCookieRequired(),
isWebSocketEnabled());
response.getBody().write(content.getBytes());
} else if (HttpMethod.OPTIONS.equals(request.getMethod())) {
response.setStatusCode(HttpStatus.NO_CONTENT);
addCorsHeaders(request, response, HttpMethod.OPTIONS, HttpMethod.GET);
addCacheHeaders(response);
} else {
sendMethodNotAllowed(response, Arrays.asList(HttpMethod.OPTIONS, HttpMethod.GET));
}
}
@Override
public void handle(ServerHttpRequest request, ServerHttpResponse response)
throws IOException {
if (!HttpMethod.GET.equals(request.getMethod())) {
sendMethodNotAllowed(response, Arrays.asList(HttpMethod.GET));
return;
}
String content = String.format(IFRAME_CONTENT, getSockJsClientLibraryUrl());
byte[] contentBytes = content.getBytes(Charset.forName("UTF-8"));
StringBuilder builder = new StringBuilder("\"0");
DigestUtils.appendMd5DigestAsHex(contentBytes, builder);
builder.append('"');
String etagValue = builder.toString();
List<String> ifNoneMatch = request.getHeaders().getIfNoneMatch();
if (!CollectionUtils.isEmpty(ifNoneMatch) && ifNoneMatch.get(0).equals(etagValue)) {
response.setStatusCode(HttpStatus.NOT_MODIFIED);
return;
}
response
.getHeaders()
.setContentType(new MediaType("text", "html", Charset.forName("UTF-8")));
response.getHeaders().setContentLength(contentBytes.length);
addCacheHeaders(response);
response.getHeaders().setETag(etagValue);
response.getBody().write(contentBytes);
}
@Override
public final boolean doHandshake(
ServerHttpRequest request,
ServerHttpResponse response,
WebSocketHandler wsHandler,
Map<String, Object> attributes)
throws HandshakeFailureException {
if (logger.isDebugEnabled()) {
logger.debug(
"Initiating handshake for " + request.getURI() + ", headers=" + request.getHeaders());
}
try {
if (!HttpMethod.GET.equals(request.getMethod())) {
response.setStatusCode(HttpStatus.METHOD_NOT_ALLOWED);
response.getHeaders().setAllow(Collections.singleton(HttpMethod.GET));
logger.debug("Only HTTP GET is allowed, current method is " + request.getMethod());
return false;
}
if (!"WebSocket".equalsIgnoreCase(request.getHeaders().getUpgrade())) {
handleInvalidUpgradeHeader(request, response);
return false;
}
if (!request.getHeaders().getConnection().contains("Upgrade")
&& !request.getHeaders().getConnection().contains("upgrade")) {
handleInvalidConnectHeader(request, response);
return false;
}
if (!isWebSocketVersionSupported(request)) {
handleWebSocketVersionNotSupported(request, response);
return false;
}
if (!isValidOrigin(request)) {
response.setStatusCode(HttpStatus.FORBIDDEN);
return false;
}
String wsKey = request.getHeaders().getSecWebSocketKey();
if (wsKey == null) {
logger.debug("Missing \"Sec-WebSocket-Key\" header");
response.setStatusCode(HttpStatus.BAD_REQUEST);
return false;
}
} catch (IOException ex) {
throw new HandshakeFailureException(
"Response update failed during upgrade to WebSocket, uri=" + request.getURI(), ex);
}
String subProtocol = selectProtocol(request.getHeaders().getSecWebSocketProtocol());
if (logger.isDebugEnabled()) {
logger.debug("Upgrading request, sub-protocol=" + subProtocol);
}
this.requestUpgradeStrategy.upgrade(request, response, subProtocol, wsHandler, attributes);
return true;
}