private void handleHttpRequest(ChannelHandlerContext ctx, HttpRequest req) throws Exception {
// Allow only GET methods.
if (req.getMethod() != GET) {
sendHttpResponse(ctx, req, new DefaultHttpResponse(HTTP_1_1, FORBIDDEN));
return;
}
// Send the demo page.
if (req.getUri().equals("/")) {
HttpResponse res = new DefaultHttpResponse(HTTP_1_1, OK);
ChannelBuffer content = WebSocketServerIndexPage.getContent(getWebSocketLocation(req));
res.setHeader(CONTENT_TYPE, "text/html; charset=UTF-8");
setContentLength(res, content.readableBytes());
res.setContent(content);
sendHttpResponse(ctx, req, res);
return;
}
// Serve the WebSocket handshake request.
if (req.getUri().equals(WEBSOCKET_PATH)
&& Values.UPGRADE.equalsIgnoreCase(req.getHeader(CONNECTION))
&& WEBSOCKET.equalsIgnoreCase(req.getHeader(Names.UPGRADE))) {
// Create the WebSocket handshake response.
HttpResponse res =
new DefaultHttpResponse(
HTTP_1_1, new HttpResponseStatus(101, "Web Socket Protocol Handshake"));
res.addHeader(Names.UPGRADE, WEBSOCKET);
res.addHeader(CONNECTION, Values.UPGRADE);
// Fill in the headers and contents depending on handshake method.
if (req.containsHeader(SEC_WEBSOCKET_KEY1) && req.containsHeader(SEC_WEBSOCKET_KEY2)) {
// New handshake method with a challenge:
res.addHeader(SEC_WEBSOCKET_ORIGIN, req.getHeader(ORIGIN));
res.addHeader(SEC_WEBSOCKET_LOCATION, getWebSocketLocation(req));
String protocol = req.getHeader(SEC_WEBSOCKET_PROTOCOL);
if (protocol != null) {
res.addHeader(SEC_WEBSOCKET_PROTOCOL, protocol);
}
// Calculate the answer of the challenge.
String key1 = req.getHeader(SEC_WEBSOCKET_KEY1);
String key2 = req.getHeader(SEC_WEBSOCKET_KEY2);
int a =
(int)
(Long.parseLong(key1.replaceAll("[^0-9]", ""))
/ key1.replaceAll("[^ ]", "").length());
int b =
(int)
(Long.parseLong(key2.replaceAll("[^0-9]", ""))
/ key2.replaceAll("[^ ]", "").length());
long c = req.getContent().readLong();
ChannelBuffer input = ChannelBuffers.buffer(16);
input.writeInt(a);
input.writeInt(b);
input.writeLong(c);
ChannelBuffer output =
ChannelBuffers.wrappedBuffer(MessageDigest.getInstance("MD5").digest(input.array()));
res.setContent(output);
} else {
// Old handshake method with no challenge:
res.addHeader(WEBSOCKET_ORIGIN, req.getHeader(ORIGIN));
res.addHeader(WEBSOCKET_LOCATION, getWebSocketLocation(req));
String protocol = req.getHeader(WEBSOCKET_PROTOCOL);
if (protocol != null) {
res.addHeader(WEBSOCKET_PROTOCOL, protocol);
}
}
// Upgrade the connection and send the handshake response.
ChannelPipeline p = ctx.getChannel().getPipeline();
p.remove("aggregator");
p.replace("decoder", "wsdecoder", new WebSocketFrameDecoder());
ctx.getChannel().write(res);
p.replace("encoder", "wsencoder", new WebSocketFrameEncoder());
return;
}
// Send an error page otherwise.
sendHttpResponse(ctx, req, new DefaultHttpResponse(HTTP_1_1, FORBIDDEN));
}